Contents of /trunk/kernel26-magellan/patches-2.6.21-r4/0154-2.6.21-suspend2-2.2.9.17.patch
Parent Directory | Revision Log
Revision 222 -
(show annotations)
(download)
Tue Jun 12 08:03:28 2007 UTC (17 years, 3 months ago) by niro
File size: 471058 byte(s)
Tue Jun 12 08:03:28 2007 UTC (17 years, 3 months ago) by niro
File size: 471058 byte(s)
files for 2.6.21-magellan-r4
1 | diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt |
2 | index 12533a9..68e902e 100644 |
3 | --- a/Documentation/kernel-parameters.txt |
4 | +++ b/Documentation/kernel-parameters.txt |
5 | @@ -82,6 +82,7 @@ parameter is applicable: |
6 | SH SuperH architecture is enabled. |
7 | SMP The kernel is an SMP kernel. |
8 | SPARC Sparc architecture is enabled. |
9 | + SUSPEND2 Suspend2 is enabled. |
10 | SWSUSP Software suspend is enabled. |
11 | TS Appropriate touchscreen support is enabled. |
12 | USB USB support is enabled. |
13 | @@ -1140,6 +1141,8 @@ and is between 256 and 4096 characters. It is defined in the file |
14 | noresume [SWSUSP] Disables resume and restores original swap |
15 | space. |
16 | |
17 | + noresume2 [SUSPEND2] Disables resuming and restores original swap signature. |
18 | + |
19 | no-scroll [VGA] Disables scrollback. |
20 | This is required for the Braillex ib80-piezo Braille |
21 | reader made by F.H. Papenmeier (Germany). |
22 | @@ -1445,6 +1448,11 @@ and is between 256 and 4096 characters. It is defined in the file |
23 | |
24 | retain_initrd [RAM] Keep initrd memory after extraction |
25 | |
26 | + resume2= [SUSPEND2] Specify the storage device for Suspend2. |
27 | + Format: <writer>:<writer-parameters>. |
28 | + See Documentation/power/suspend2.txt for details of the |
29 | + formats for available image writers. |
30 | + |
31 | rhash_entries= [KNL,NET] |
32 | Set number of hash buckets for route cache |
33 | |
34 | diff --git a/Documentation/power/suspend2-internals.txt b/Documentation/power/suspend2-internals.txt |
35 | new file mode 100644 |
36 | index 0000000..ba4e1e5 |
37 | --- /dev/null |
38 | +++ b/Documentation/power/suspend2-internals.txt |
39 | @@ -0,0 +1,473 @@ |
40 | + Software Suspend 2.2 Internal Documentation. |
41 | + Version 1 |
42 | + |
43 | +1. Introduction. |
44 | + |
45 | + Software Suspend 2.2 is an addition to the Linux Kernel, designed to |
46 | + allow the user to quickly shutdown and quickly boot a computer, without |
47 | + needing to close documents or programs. It is equivalent to the |
48 | + hibernate facility in some laptops. This implementation, however, |
49 | + requires no special BIOS or hardware support. |
50 | + |
51 | + The code in these files is based upon the original implementation |
52 | + prepared by Gabor Kuti and additional work by Pavel Machek and a |
53 | + host of others. This code has been substantially reworked by Nigel |
54 | + Cunningham, again with the help and testing of many others, not the |
55 | + least of whom is Michael Frank. At its heart, however, the operation is |
56 | + essentially the same as Gabor's version. |
57 | + |
58 | +2. Overview of operation. |
59 | + |
60 | + The basic sequence of operations is as follows: |
61 | + |
62 | + a. Quiesce all other activity. |
63 | + b. Ensure enough memory and storage space are available, and attempt |
64 | + to free memory/storage if necessary. |
65 | + c. Allocate the required memory and storage space. |
66 | + d. Write the image. |
67 | + e. Power down. |
68 | + |
69 | + There are a number of complicating factors which mean that things are |
70 | + not as simple as the above would imply, however... |
71 | + |
72 | + o The activity of each process must be stopped at a point where it will |
73 | + not be holding locks necessary for saving the image, or unexpectedly |
74 | + restart operations due to something like a timeout and thereby make |
75 | + our image inconsistent. |
76 | + |
77 | + o It is desirous that we sync outstanding I/O to disk before calculating |
78 | + image statistics. This reduces corruption if one should suspend but |
79 | + then not resume, and also makes later parts of the operation safer (see |
80 | + below). |
81 | + |
82 | + o We need to get as close as we can to an atomic copy of the data. |
83 | + Inconsistencies in the image will result in inconsistent memory contents at |
84 | + resume time, and thus in instability of the system and/or file system |
85 | + corruption. This would appear to imply a maximum image size of one half of |
86 | + the amount of RAM, but we have a solution... (again, below). |
87 | + |
88 | + o In 2.6, we choose to play nicely with the other suspend-to-disk |
89 | + implementations. |
90 | + |
91 | +3. Detailed description of internals. |
92 | + |
93 | + a. Quiescing activity. |
94 | + |
95 | + Safely quiescing the system is achieved using two methods. |
96 | + |
97 | + First, we note that the vast majority of processes don't need to run during |
98 | + suspend. They can be 'frozen'. We therefore implement a refrigerator |
99 | + routine, which processes enter and in which they remain until the cycle is |
100 | + complete. Processes enter the refrigerator via try_to_freeze() invocations |
101 | + at appropriate places. A process cannot be frozen in any old place. It |
102 | + must not be holding locks that will be needed for writing the image or |
103 | + freezing other processes. For this reason, userspace processes generally |
104 | + enter the refrigerator via the signal handling code, and kernel threads at |
105 | + the place in their event loops where they drop locks and yield to other |
106 | + processes or sleep. |
107 | + |
108 | + The second part of our method for quisescing the system involves freezing |
109 | + the filesystems. We use the standard freeze_bdev and thaw_bdev functions to |
110 | + ensure that all of the user's data is synced to disk before we begin to |
111 | + write the image. This is particularly important with XFS, where without |
112 | + bdev freezing, activity may still occur after we begin to write the image |
113 | + (potentially causing in-memory and on-disk corruption later). |
114 | + |
115 | + Quiescing the system works most quickly and reliably when we add one more |
116 | + element to the algorithm: separating the freezing of userspace processes |
117 | + from the freezing of kernel space processes, and doing the filesystem freeze |
118 | + in between. The filesystem freeze needs to be done while kernel threads such |
119 | + as kjournald can still run. At the same time, though, everything will be |
120 | + less racy and run more quickly if we stop userspace submitting more I/O work |
121 | + while we're trying to quiesce. |
122 | + |
123 | + Quiescing the system is therefore done in three steps: |
124 | + - Freeze userspace |
125 | + - Freeze filesystems |
126 | + - Freeze kernel threads |
127 | + |
128 | + If we need to free memory, we thaw kernel threads and filesystems, but not |
129 | + userspace. We can then free caches without worrying about deadlocks due to |
130 | + swap files being on frozen filesystems or such like. |
131 | + |
132 | + One limitation of this is that FUSE filesystems are incompatible with |
133 | + suspending to disk. They need to be unmounted prior to suspending, to avoid |
134 | + potential deadlocks. |
135 | + |
136 | + b. Ensure enough memory & storage are available. |
137 | + |
138 | + We have a number of constraints to meet in order to be able to successfully |
139 | + suspend and resume. |
140 | + |
141 | + First, the image will be written in two parts, described below. One of these |
142 | + parts needs to have an atomic copy made, which of course implies a maximum |
143 | + size of one half of the amount of system memory. The other part ('pageset') |
144 | + is not atomically copied, and can therefore be as large or small as desired. |
145 | + |
146 | + Second, we have constraints on the amount of storage available. In these |
147 | + calculations, we may also consider any compression that will be done. The |
148 | + cryptoapi module allows the user to configure an expected compression ratio. |
149 | + |
150 | + Third, the user can specify an arbitrary limit on the image size, in |
151 | + megabytes. This limit is treated as a soft limit, so that we don't fail the |
152 | + attempt to suspend if we cannot meet this constraint. |
153 | + |
154 | + c. Allocate the required memory and storage space. |
155 | + |
156 | + Having done the initial freeze, we determine whether the above constraints |
157 | + are met, and seek to allocate the metadata for the image. If the constraints |
158 | + are not met, or we fail to allocate the required space for the metadata, we |
159 | + seek to free the amount of memory that we calculate is needed and try again. |
160 | + We allow up to four iterations of this loop before aborting the cycle. If we |
161 | + do fail, it should only be because of a bug in Suspend's calculations. |
162 | + |
163 | + These steps are merged together in the prepare_image function, found in |
164 | + prepare_image.c. The functions are merged because of the cyclical nature |
165 | + of the problem of calculating how much memory and storage is needed. Since |
166 | + the data structures containing the information about the image must |
167 | + themselves take memory and use storage, the amount of memory and storage |
168 | + required changes as we prepare the image. Since the changes are not large, |
169 | + only one or two iterations will be required to achieve a solution. |
170 | + |
171 | + The recursive nature of the algorithm is miminised by keeping user space |
172 | + frozen while preparing the image, and by the fact that our records of which |
173 | + pages are to be saved and which pageset they are saved in use bitmaps (so |
174 | + that changes in number or fragmentation of the pages to be saved don't |
175 | + feedback via changes in the amount of memory needed for metadata). The |
176 | + recursiveness is thus limited to any extra slab pages allocated to store the |
177 | + extents that record storage used, and he effects of seeking to free memory. |
178 | + |
179 | + d. Write the image. |
180 | + |
181 | + We previously mentioned the need to create an atomic copy of the data, and |
182 | + the half-of-memory limitation that is implied in this. This limitation is |
183 | + circumvented by dividing the memory to be saved into two parts, called |
184 | + pagesets. |
185 | + |
186 | + Pageset2 contains the page cache - the pages on the active and inactive |
187 | + lists. These pages aren't needed or modifed while Suspend2 is running, so |
188 | + they can be safely written without an atomic copy. They are therefore |
189 | + saved first and reloaded last. While saving these pages, Suspend2 carefully |
190 | + ensures that the work of writing the pages doesn't make the image |
191 | + inconsistent. |
192 | + |
193 | + Once pageset2 has been saved, we prepare to do the atomic copy of remaining |
194 | + memory. As part of the preparation, we power down drivers, thereby providing |
195 | + them with the opportunity to have their state recorded in the image. The |
196 | + amount of memory allocated by drivers for this is usually negligible, but if |
197 | + DRI is in use, video drivers may require significants amounts. Ideally we |
198 | + would be able to query drivers while preparing the image as to the amount of |
199 | + memory they will need. Unfortunately no such mechanism exists at the time of |
200 | + writing. For this reason, Suspend2 allows the user to set an |
201 | + 'extra_pages_allowance', which is used to seek to ensure sufficient memory |
202 | + is available for drivers at this point. Suspend2 also lets the user set this |
203 | + value to 0. In this case, a test driver suspend is done while preparing the |
204 | + image, and the difference (plus a margin) used instead. |
205 | + |
206 | + Having suspended the drivers, we save the CPU context before making an |
207 | + atomic copy of pageset1, resuming the drivers and saving the atomic copy. |
208 | + After saving the two pagesets, we just need to save our metadata before |
209 | + powering down. |
210 | + |
211 | + As we mentioned earlier, the contents of pageset2 pages aren't needed once |
212 | + they've been saved. We therefore use them as the destination of our atomic |
213 | + copy. In the unlikely event that pageset1 is larger, extra pages are |
214 | + allocated while the image is being prepared. This is normally only a real |
215 | + possibility when the system has just been booted and the page cache is |
216 | + small. |
217 | + |
218 | + This is where we need to be careful about syncing, however. Pageset2 will |
219 | + probably contain filesystem meta data. If this is overwritten with pageset1 |
220 | + and then a sync occurs, the filesystem will be corrupted - at least until |
221 | + resume time and another sync of the restored data. Since there is a |
222 | + possibility that the user might not resume or (may it never be!) that |
223 | + suspend might oops, we do our utmost to avoid syncing filesystems after |
224 | + copying pageset1. |
225 | + |
226 | + e. Power down. |
227 | + |
228 | + Powering down uses standard kernel routines. Suspend2 supports powering down |
229 | + using the ACPI S3, S4 and S5 methods or the kernel's non-ACPI power-off. |
230 | + Supporting suspend to ram (S3) as a power off option might sound strange, |
231 | + but it allows the user to quickly get their system up and running again if |
232 | + the battery doesn't run out (we just need to re-read the overwritten pages) |
233 | + and if the battery does run out (or the user removes power), they can still |
234 | + resume. |
235 | + |
236 | +4. Data Structures. |
237 | + |
238 | + Suspend2 uses three main structures to store its metadata and configuration |
239 | + information: |
240 | + |
241 | + a) Pageflags bitmaps. |
242 | + |
243 | + Suspend records which pages will be in pageset1, pageset2, the destination |
244 | + of the atomic copy and the source of the atomically restored image using |
245 | + bitmaps. These bitmaps are created from order zero allocations to maximise |
246 | + reliability. The individual pages are combined together with pointers to |
247 | + form per-zone bitmaps, which are in turn combined with another layer of |
248 | + pointers to construct the overall bitmap. |
249 | + |
250 | + The pageset1 bitmap is thus easily stored in the image header for use at |
251 | + resume time. |
252 | + |
253 | + As mentioned above, using bitmaps also means that the amount of memory and |
254 | + storage required for recording the above information is constant. This |
255 | + greatly simplifies the work of preparing the image. In earlier versions of |
256 | + Suspend2, extents were used to record which pages would be stored. In that |
257 | + case, however, eating memory could result in greater fragmentation of the |
258 | + lists of pages, which in turn required more memory to store the extents and |
259 | + more storage in the image header. These could in turn require further |
260 | + freeing of memory, and another iteration. All of this complexity is removed |
261 | + by having bitmaps. |
262 | + |
263 | + Bitmaps also make a lot of sense because Suspend2 only ever iterates |
264 | + through the lists. There is therefore no cost to not being able to find the |
265 | + nth page in order 0 time. We only need to worry about the cost of finding |
266 | + the n+1th page, given the location of the nth page. Bitwise optimisations |
267 | + help here. |
268 | + |
269 | + The data structure is: unsigned long ***. |
270 | + |
271 | + b) Extents for block data. |
272 | + |
273 | + Suspend2 supports writing the image to multiple block devices. In the case |
274 | + of swap, multiple partitions and/or files may be in use, and we happily use |
275 | + them all. This is accomplished as follows: |
276 | + |
277 | + Whatever the actual source of the allocated storage, the destination of the |
278 | + image can be viewed in terms of one or more block devices, and on each |
279 | + device, a list of sectors. To simplify matters, we only use contiguous, |
280 | + PAGE_SIZE aligned sectors, like the swap code does. |
281 | + |
282 | + Since sector numbers on each bdev may well not start at 0, it makes much |
283 | + more sense to use extents here. Contiguous ranges of pages can thus be |
284 | + represented in the extents by contiguous values. |
285 | + |
286 | + Variations in block size are taken account of in transforming this data |
287 | + into the parameters for bio submission. |
288 | + |
289 | + We can thus implement a layer of abstraction wherein the core of Suspend2 |
290 | + doesn't have to worry about which device we're currently writing to or |
291 | + where in the device we are. It simply requests that the next page in the |
292 | + pageset or header be written, leaving the details to this lower layer. |
293 | + The lower layer remembers where in the sequence of devices and blocks each |
294 | + pageset starts. The header always starts at the beginning of the allocated |
295 | + storage. |
296 | + |
297 | + So extents are: |
298 | + |
299 | + struct extent { |
300 | + unsigned long minimum, maximum; |
301 | + struct extent *next; |
302 | + } |
303 | + |
304 | + These are combined into chains of extents for a device: |
305 | + |
306 | + struct extent_chain { |
307 | + int size; /* size of the extent ie sum (max-min+1) */ |
308 | + int allocs, frees; |
309 | + char *name; |
310 | + struct extent *first, *last_touched; |
311 | + }; |
312 | + |
313 | + For each bdev, we need to store a little more info: |
314 | + |
315 | + struct suspend_bdev_info { |
316 | + struct block_device *bdev; |
317 | + dev_t dev_t; |
318 | + int bmap_shift; |
319 | + int blocks_per_page; |
320 | + }; |
321 | + |
322 | + The dev_t is used to identify the device in the stored image. As a result, |
323 | + we expect devices at resume time to have the same major and minor numbers |
324 | + as they had while suspending. This is primarily a concern where the user |
325 | + utilises LVM for storage, as they will need to dmsetup their partitions in |
326 | + such a way as to maintain this consistency at resume time. |
327 | + |
328 | + bmap_shift and blocks_per_page record apply the effects of variations in |
329 | + blocks per page settings for the filesystem and underlying bdev. For most |
330 | + filesystems, these are the same, but for xfs, they can have independant |
331 | + values. |
332 | + |
333 | + Combining these two structures together, we have everything we need to |
334 | + record what devices and what blocks on each device are being used to |
335 | + store the image, and to submit i/o using bio_submit. |
336 | + |
337 | + The last elements in the picture are a means of recording how the storage |
338 | + is being used. |
339 | + |
340 | + We do this first and foremost by implementing a layer of abstraction on |
341 | + top of the devices and extent chains which allows us to view however many |
342 | + devices there might be as one long storage tape, with a single 'head' that |
343 | + tracks a 'current position' on the tape: |
344 | + |
345 | + struct extent_iterate_state { |
346 | + struct extent_chain *chains; |
347 | + int num_chains; |
348 | + int current_chain; |
349 | + struct extent *current_extent; |
350 | + unsigned long current_offset; |
351 | + }; |
352 | + |
353 | + That is, *chains points to an array of size num_chains of extent chains. |
354 | + For the filewriter, this is always a single chain. For the swapwriter, the |
355 | + array is of size MAX_SWAPFILES. |
356 | + |
357 | + current_chain, current_extent and current_offset thus point to the current |
358 | + index in the chains array (and into a matching array of struct |
359 | + suspend_bdev_info), the current extent in that chain (to optimise access), |
360 | + and the current value in the offset. |
361 | + |
362 | + The image is divided into three parts: |
363 | + - The header |
364 | + - Pageset 1 |
365 | + - Pageset 2 |
366 | + |
367 | + The header always starts at the first device and first block. We know its |
368 | + size before we begin to save the image because we carefully account for |
369 | + everything that will be stored in it. |
370 | + |
371 | + The second pageset (LRU) is stored first. It begins on the next page after |
372 | + the end of the header. |
373 | + |
374 | + The first pageset is stored second. It's start location is only known once |
375 | + pageset2 has been saved, since pageset2 may be compressed as it is written. |
376 | + This location is thus recorded at the end of saving pageset2. It is page |
377 | + aligned also. |
378 | + |
379 | + Since this information is needed at resume time, and the location of extents |
380 | + in memory will differ at resume time, this needs to be stored in a portable |
381 | + way: |
382 | + |
383 | + struct extent_iterate_saved_state { |
384 | + int chain_num; |
385 | + int extent_num; |
386 | + unsigned long offset; |
387 | + }; |
388 | + |
389 | + We can thus implement a layer of abstraction wherein the core of Suspend2 |
390 | + doesn't have to worry about which device we're currently writing to or |
391 | + where in the device we are. It simply requests that the next page in the |
392 | + pageset or header be written, leaving the details to this layer, and |
393 | + invokes the routines to remember and restore the position, without having |
394 | + to worry about the details of how the data is arranged on disk or such like. |
395 | + |
396 | + c) Modules |
397 | + |
398 | + One aim in designing Suspend2 was to make it flexible. We wanted to allow |
399 | + for the implementation of different methods of transforming a page to be |
400 | + written to disk and different methods of getting the pages stored. |
401 | + |
402 | + In early versions (the betas and perhaps Suspend1), compression support was |
403 | + inlined in the image writing code, and the data structures and code for |
404 | + managing swap were intertwined with the rest of the code. A number of people |
405 | + had expressed interest in implementing image encryption, and alternative |
406 | + methods of storing the image. |
407 | + |
408 | + In order to achieve this, Suspend2 was given a modular design. |
409 | + |
410 | + A module is a single file which encapsulates the functionality needed |
411 | + to transform a pageset of data (encryption or compression, for example), |
412 | + or to write the pageset to a device. The former type of module is called |
413 | + a 'page-transformer', the later a 'writer'. |
414 | + |
415 | + Modules are linked together in pipeline fashion. There may be zero or more |
416 | + page transformers in a pipeline, and there is always exactly one writer. |
417 | + The pipeline follows this pattern: |
418 | + |
419 | + --------------------------------- |
420 | + | Suspend2 Core | |
421 | + --------------------------------- |
422 | + | |
423 | + | |
424 | + --------------------------------- |
425 | + | Page transformer 1 | |
426 | + --------------------------------- |
427 | + | |
428 | + | |
429 | + --------------------------------- |
430 | + | Page transformer 2 | |
431 | + --------------------------------- |
432 | + | |
433 | + | |
434 | + --------------------------------- |
435 | + | Writer | |
436 | + --------------------------------- |
437 | + |
438 | + During the writing of an image, the core code feeds pages one at a time |
439 | + to the first module. This module performs whatever transformations it |
440 | + implements on the incoming data, completely consuming the incoming data and |
441 | + feeding output in a similar manner to the next module. A module may buffer |
442 | + its output. |
443 | + |
444 | + During reading, the pipeline works in the reverse direction. The core code |
445 | + calls the first module with the address of a buffer which should be filled. |
446 | + (Note that the buffer size is always PAGE_SIZE at this time). This module |
447 | + will in turn request data from the next module and so on down until the |
448 | + writer is made to read from the stored image. |
449 | + |
450 | + Part of definition of the structure of a module thus looks like this: |
451 | + |
452 | + int (*rw_init) (int rw, int stream_number); |
453 | + int (*rw_cleanup) (int rw); |
454 | + int (*write_chunk) (struct page *buffer_page); |
455 | + int (*read_chunk) (struct page *buffer_page, int sync); |
456 | + |
457 | + It should be noted that the _cleanup routine may be called before the |
458 | + full stream of data has been read or written. While writing the image, |
459 | + the user may (depending upon settings) choose to abort suspending, and |
460 | + if we are in the midst of writing the last portion of the image, a portion |
461 | + of the second pageset may be reread. This may also happen if an error |
462 | + occurs and we seek to abort the process of writing the image. |
463 | + |
464 | + The modular design is also useful in a number of other ways. It provides |
465 | + a means where by we can add support for: |
466 | + |
467 | + - providing overall initialisation and cleanup routines; |
468 | + - serialising configuration information in the image header; |
469 | + - providing debugging information to the user; |
470 | + - determining memory and image storage requirements; |
471 | + - dis/enabling components at run-time; |
472 | + - configuring the module (see below); |
473 | + |
474 | + ...and routines for writers specific to their work: |
475 | + - Parsing a resume2= location; |
476 | + - Determining whether an image exists; |
477 | + - Marking a resume as having been attempted; |
478 | + - Invalidating an image; |
479 | + |
480 | + Since some parts of the core - the user interface and storage manager |
481 | + support - have use for some of these functions, they are registered as |
482 | + 'miscellaneous' modules as well. |
483 | + |
484 | + d) Sysfs data structures. |
485 | + |
486 | + This brings us naturally to support for configuring Suspend2. We desired to |
487 | + provide a way to make Suspend2 as flexible and configurable as possible. |
488 | + The user shouldn't have to reboot just because they want to now suspend to |
489 | + a file instead of a partition, for example. |
490 | + |
491 | + To accomplish this, Suspend2 implements a very generic means whereby the |
492 | + core and modules can register new sysfs entries. All Suspend2 entries use |
493 | + a single _store and _show routine, both of which are found in sysfs.c in |
494 | + the kernel/power directory. These routines handle the most common operations |
495 | + - getting and setting the values of bits, integers, longs, unsigned longs |
496 | + and strings in one place, and allow overrides for customised get and set |
497 | + options as well as side-effect routines for all reads and writes. |
498 | + |
499 | + When combined with some simple macros, a new sysfs entry can then be defined |
500 | + in just a couple of lines: |
501 | + |
502 | + { SUSPEND2_ATTR("progress_granularity", SYSFS_RW), |
503 | + SYSFS_INT(&progress_granularity, 1, 2048) |
504 | + }, |
505 | + |
506 | + This defines a sysfs entry named "progress_granularity" which is rw and |
507 | + allows the user to access an integer stored at &progress_granularity, giving |
508 | + it a value between 1 and 2048 inclusive. |
509 | + |
510 | + Sysfs entries are registered under /sys/power/suspend2, and entries for |
511 | + modules are located in a subdirectory named after the module. |
512 | + |
513 | diff --git a/Documentation/power/suspend2.txt b/Documentation/power/suspend2.txt |
514 | new file mode 100644 |
515 | index 0000000..b5a8edb |
516 | --- /dev/null |
517 | +++ b/Documentation/power/suspend2.txt |
518 | @@ -0,0 +1,713 @@ |
519 | + --- Suspend2, version 2.2 --- |
520 | + |
521 | +1. What is it? |
522 | +2. Why would you want it? |
523 | +3. What do you need to use it? |
524 | +4. Why not just use the version already in the kernel? |
525 | +5. How do you use it? |
526 | +6. What do all those entries in /sys/power/suspend2 do? |
527 | +7. How do you get support? |
528 | +8. I think I've found a bug. What should I do? |
529 | +9. When will XXX be supported? |
530 | +10 How does it work? |
531 | +11. Who wrote Suspend2? |
532 | + |
533 | +1. What is it? |
534 | + |
535 | + Imagine you're sitting at your computer, working away. For some reason, you |
536 | + need to turn off your computer for a while - perhaps it's time to go home |
537 | + for the day. When you come back to your computer next, you're going to want |
538 | + to carry on where you left off. Now imagine that you could push a button and |
539 | + have your computer store the contents of its memory to disk and power down. |
540 | + Then, when you next start up your computer, it loads that image back into |
541 | + memory and you can carry on from where you were, just as if you'd never |
542 | + turned the computer off. Far less time to start up, no reopening |
543 | + applications and finding what directory you put that file in yesterday. |
544 | + That's what Suspend2 does. |
545 | + |
546 | + Suspend2 has a long heritage. It began life as work by Gabor Kuti, who, |
547 | + with some help from Pavel Machek, got an early version going in 1999. The |
548 | + project was then taken over by Florent Chabaud while still in alpha version |
549 | + numbers. Nigel Cunningham came on the scene when Florent was unable to |
550 | + continue, moving the project into betas, then 1.0, 2.0 and so on up to |
551 | + the present 2.2 series. Pavel Machek's swsusp code, which was merged around |
552 | + 2.5.17 retains the original name, and was essentially a fork of the beta |
553 | + code until Rafael Wysocki came on the scene in 2005 and began to improve it |
554 | + further. |
555 | + |
556 | +2. Why would you want it? |
557 | + |
558 | + Why wouldn't you want it? |
559 | + |
560 | + Being able to save the state of your system and quickly restore it improves |
561 | + your productivity - you get a useful system in far less time than through |
562 | + the normal boot process. |
563 | + |
564 | +3. What do you need to use it? |
565 | + |
566 | + a. Kernel Support. |
567 | + |
568 | + i) The Suspend2 patch. |
569 | + |
570 | + Suspend2 is part of the Linux Kernel. This version is not part of Linus's |
571 | + 2.6 tree at the moment, so you will need to download the kernel source and |
572 | + apply the latest patch. Having done that, enable the appropriate options in |
573 | + make [menu|x]config (under Power Management Options), compile and install your |
574 | + kernel. Suspend2 works with SMP, Highmem, preemption, x86-32, PPC and x86_64. |
575 | + |
576 | + Suspend2 patches are available from http://suspend2.net. |
577 | + |
578 | + ii) Compression and encryption support. |
579 | + |
580 | + Compression and encryption support are implemented via the |
581 | + cryptoapi. You will therefore want to select any Cryptoapi transforms that |
582 | + you want to use on your image from the Cryptoapi menu while configuring |
583 | + your kernel. |
584 | + |
585 | + You can also tell Suspend to write it's image to an encrypted and/or |
586 | + compressed filesystem/swap partition. In that case, you don't need to do |
587 | + anything special for Suspend2 when it comes to kernel configuration. |
588 | + |
589 | + iii) Configuring other options. |
590 | + |
591 | + While you're configuring your kernel, try to configure as much as possible |
592 | + to build as modules. We recommend this because there are a number of drivers |
593 | + that are still in the process of implementing proper power management |
594 | + support. In those cases, the best way to work around their current lack is |
595 | + to build them as modules and remove the modules while suspending. You might |
596 | + also bug the driver authors to get their support up to speed, or even help! |
597 | + |
598 | + b. Storage. |
599 | + |
600 | + i) Swap. |
601 | + |
602 | + Suspend2 can store the suspend image in your swap partition, a swap file or |
603 | + a combination thereof. Whichever combination you choose, you will probably |
604 | + want to create enough swap space to store the largest image you could have, |
605 | + plus the space you'd normally use for swap. A good rule of thumb would be |
606 | + to calculate the amount of swap you'd want without using Suspend2, and then |
607 | + add the amount of memory you have. This swapspace can be arranged in any way |
608 | + you'd like. It can be in one partition or file, or spread over a number. The |
609 | + only requirement is that they be active when you start a suspend cycle. |
610 | + |
611 | + There is one exception to this requirement. Suspend2 has the ability to turn |
612 | + on one swap file or partition at the start of suspending and turn it back off |
613 | + at the end. If you want to ensure you have enough memory to store a image |
614 | + when your memory is fully used, you might want to make one swap partition or |
615 | + file for 'normal' use, and another for Suspend2 to activate & deactivate |
616 | + automatically. (Further details below). |
617 | + |
618 | + ii) Normal files. |
619 | + |
620 | + Suspend2 includes a 'filewriter'. The filewriter can store your image in a |
621 | + simple file. Since Linux has the idea of everything being a file, this is |
622 | + more powerful than it initially sounds. If, for example, you were to set up |
623 | + a network block device file, you could suspend to a network server. This has |
624 | + been tested and works to a point, but nbd itself isn't stateless enough for |
625 | + our purposes. |
626 | + |
627 | + Take extra care when setting up the filewriter. If you just type commands |
628 | + without thinking and then try to suspend, you could cause irreversible |
629 | + corruption on your filesystems! Make sure you have backups. |
630 | + |
631 | + Most people will only want to suspend to a local file. To achieve that, do |
632 | + something along the lines of: |
633 | + |
634 | + echo "Suspend2" > /suspend-file |
635 | + dd if=/dev/zero bs=1M count=512 >> suspend-file |
636 | + |
637 | + This will create a 512MB file called /suspend-file. To get Suspend2 to use |
638 | + it: |
639 | + |
640 | + echo /suspend-file > /sys/power/suspend2/filewriter/filewriter_target |
641 | + |
642 | + Then |
643 | + |
644 | + cat /sys/power/suspend2/resume2 |
645 | + |
646 | + Put the results of this into your bootloader's configuration (see also step |
647 | + C, below: |
648 | + |
649 | + ---EXAMPLE-ONLY-DON'T-COPY-AND-PASTE--- |
650 | + # cat /sys/power/suspend2/resume2 |
651 | + file:/dev/hda2:0x1e001 |
652 | + |
653 | + In this example, we would edit the append= line of our lilo.conf|menu.lst |
654 | + so that it included: |
655 | + |
656 | + resume2=file:/dev/hda2:0x1e001 |
657 | + ---EXAMPLE-ONLY-DON'T-COPY-AND-PASTE--- |
658 | + |
659 | + For those who are thinking 'Could I make the file sparse?', the answer is |
660 | + 'No!'. At the moment, there is no way for Suspend2 to fill in the holes in |
661 | + a sparse file while suspending. In the longer term (post merge!), I'd like |
662 | + to change things so that the file could be dynamically resized as needed. |
663 | + Right now, however, that's not possible and not a priority. |
664 | + |
665 | + c. Bootloader configuration. |
666 | + |
667 | + Using Suspend2 also requires that you add an extra parameter to |
668 | + your lilo.conf or equivalent. Here's an example for a swap partition: |
669 | + |
670 | + append="resume2=swap:/dev/hda1" |
671 | + |
672 | + This would tell Suspend2 that /dev/hda1 is a swap partition you |
673 | + have. Suspend2 will use the swap signature of this partition as a |
674 | + pointer to your data when you suspend. This means that (in this example) |
675 | + /dev/hda1 doesn't need to be _the_ swap partition where all of your data |
676 | + is actually stored. It just needs to be a swap partition that has a |
677 | + valid signature. |
678 | + |
679 | + You don't need to have a swap partition for this purpose. Suspend2 |
680 | + can also use a swap file, but usage is a little more complex. Having made |
681 | + your swap file, turn it on and do |
682 | + |
683 | + cat /sys/power/suspend2/swapwriter/headerlocations |
684 | + |
685 | + (this assumes you've already compiled your kernel with Suspend2 |
686 | + support and booted it). The results of the cat command will tell you |
687 | + what you need to put in lilo.conf: |
688 | + |
689 | + For swap partitions like /dev/hda1, simply use resume2=/dev/hda1. |
690 | + For swapfile `swapfile`, use resume2=swap:/dev/hda2:0x242d. |
691 | + |
692 | + If the swapfile changes for any reason (it is moved to a different |
693 | + location, it is deleted and recreated, or the filesystem is |
694 | + defragmented) then you will have to check |
695 | + /sys/power/suspend2/swapwriter/headerlocations for a new resume_block value. |
696 | + |
697 | + Once you've compiled and installed the kernel and adjusted your bootloader |
698 | + configuration, you should only need to reboot for the most basic part |
699 | + of Suspend2 to be ready. |
700 | + |
701 | + If you only compile in the swapwriter, or only compile in the filewriter, |
702 | + you don't need to add the "swap:" part of the resume2= parameters above. |
703 | + resume2=/dev/hda2:0x242d will work just as well. |
704 | + |
705 | + d. The hibernate script. |
706 | + |
707 | + Since the driver model in 2.6 kernels is still being developed, you may need |
708 | + to do more, however. Users of Suspend2 usually start the process via a script |
709 | + which prepares for the suspend, tells the kernel to do its stuff and then |
710 | + restore things afterwards. This script might involve: |
711 | + |
712 | + - Switching to a text console and back if X doesn't like the video card |
713 | + status on resume. |
714 | + - Un/reloading PCMCIA support since it doesn't play well with suspend. |
715 | + |
716 | + Note that you might not be able to unload some drivers if there are |
717 | + processes using them. You might have to kill off processes that hold |
718 | + devices open. Hint: if your X server accesses an USB mouse, doing a |
719 | + 'chvt' to a text console releases the device and you can unload the |
720 | + module. |
721 | + |
722 | + Check out the latest script (available on suspend2.net). |
723 | + |
724 | +4. Why not just use the version already in the kernel? |
725 | + |
726 | + The version in the vanilla kernel has a number of drawbacks. Among these: |
727 | + - it has a maximum image size of 1/2 total memory. |
728 | + - it doesn't allocate storage until after it has snapshotted memory. |
729 | + This means that you can't be sure suspending will work until you |
730 | + see it start to write the image. |
731 | + - it performs all of it's I/O synchronously. |
732 | + - it does not allow you to press escape to cancel a cycle |
733 | + - it does not allow you to automatically swapon a file when |
734 | + starting a cycle. |
735 | + - it does not allow you to use multiple swap partitions. |
736 | + - it does not allow you to use swapfiles. |
737 | + - it does not allow you to use ordinary files. |
738 | + - it just invalidates an image and continues to boot if you |
739 | + accidentally boot the wrong kernel after suspending. |
740 | + - it doesn't support any sort of nice display while suspending |
741 | + - it is moving toward requiring that you have an initrd/initramfs |
742 | + to ever have a hope of resuming (uswsusp). While uswsusp will |
743 | + address some of the concerns above, it won't address all, and |
744 | + will be more complicated to get set up. |
745 | + |
746 | +5. How do you use it? |
747 | + |
748 | + A suspend cycle can be started directly by doing: |
749 | + |
750 | + echo > /sys/power/suspend2/do_resume |
751 | + |
752 | + In practice, though, you'll probably want to use the hibernate script |
753 | + to unload modules, configure the kernel the way you like it and so on. |
754 | + In that case, you'd do (as root): |
755 | + |
756 | + hibernate |
757 | + |
758 | + See the hibernate script's man page for more details on the options it |
759 | + takes. |
760 | + |
761 | + If you're using the text or splash user interface modules, one neat feature |
762 | + of Suspend2 that you might find useful is that you can press Escape at any |
763 | + time during suspending, and the process will be aborted. |
764 | + |
765 | + Due to the way suspend works, this means you'll have your system back and |
766 | + perfectly usable almost instantly. The only exception is when it's at the |
767 | + very end of writing the image. Then it will need to reload a small ( |
768 | + usually 4-50MBs, depending upon the image characteristics) portion first. |
769 | + |
770 | + If you run into problems with resuming, adding the "noresume2" option to |
771 | + the kernel command line will let you skip the resume step and recover your |
772 | + system. |
773 | + |
774 | +6. What do all those entries in /sys/power/suspend2 do? |
775 | + |
776 | + /sys/power/suspend2 is the directory which contains files you can use to |
777 | + tune and configure Suspend2 to your liking. The exact contents of |
778 | + the directory will depend upon the version of Suspend2 you're |
779 | + running and the options you selected at compile time. In the following |
780 | + descriptions, names in brackets refer to compile time options. |
781 | + (Note that they're all dependant upon you having selected CONFIG_SUSPEND2 |
782 | + in the first place!). |
783 | + |
784 | + Since the values of these settings can open potential security risks, they |
785 | + are usually accessible only to the root user. You can, however, enable a |
786 | + compile time option which makes all of these files world-accessible. This |
787 | + should only be done if you trust everyone with shell access to this |
788 | + computer! |
789 | + |
790 | + - checksum/enabled |
791 | + |
792 | + Use cryptoapi hashing routines to verify that Pageset2 pages don't change |
793 | + while we're saving the first part of the image, and to get any pages that |
794 | + do change resaved in the atomic copy. This should normally not be needed, |
795 | + but if you're seeing issues, please enable this. If your issues stop you |
796 | + being able to resume, enable this option, suspend and cancel the cycle |
797 | + after the atomic copy is done. If the debugging info shows a non-zero |
798 | + number of pages resaved, please report this to Nigel. |
799 | + |
800 | + - compression/algorithm |
801 | + |
802 | + Set the cryptoapi algorithm used for compressing the image. |
803 | + |
804 | + - compression/expected_compression |
805 | + |
806 | + These values allow you to set an expected compression ratio, which Software |
807 | + Suspend will use in calculating whether it meets constraints on the image |
808 | + size. If this expected compression ratio is not attained, the suspend will |
809 | + abort, so it is wise to allow some spare. You can see what compression |
810 | + ratio is achieved in the logs after suspending. |
811 | + |
812 | + - debug_info: |
813 | + |
814 | + This file returns information about your configuration that may be helpful |
815 | + in diagnosing problems with suspending. |
816 | + |
817 | + - do_resume: |
818 | + |
819 | + When anything is written to this file suspend will attempt to read and |
820 | + restore an image. If there is no image, it will return almost immediately. |
821 | + If an image exists, the echo > will never return. Instead, the original |
822 | + kernel context will be restored and the original echo > do_suspend will |
823 | + return. |
824 | + |
825 | + - do_suspend: |
826 | + |
827 | + When anything is written to this file, the kernel side of Suspend2 will |
828 | + begin to attempt to write an image to disk and power down. You'll normally |
829 | + want to run the hibernate script instead, to get modules unloaded first. |
830 | + |
831 | + - driver_model_beeping |
832 | + |
833 | + Enable beeping when suspending and resuming the drivers. Might help with |
834 | + determining where a problem in resuming occurs. |
835 | + |
836 | + - */enabled |
837 | + |
838 | + These option can be used to temporarily disable various parts of suspend. |
839 | + |
840 | + - encryption/* |
841 | + |
842 | + The iv, key, save_key_and_iv, mode and algorithm values allow you to |
843 | + select a cryptoapi encryption algoritm, set the iv and key and whether |
844 | + they are saved in the image header. Saving the iv and key in the image |
845 | + header is of course less secure than having them on some external device, |
846 | + such as a USB key. If you want to use a USB key, you'll need to write |
847 | + some scripting in your initrd/ramfs to retrieve the key & iv from your |
848 | + USB key and put them into the entries again prior to doing the echo to |
849 | + do_resume. |
850 | + |
851 | + - extra_pages_allowance |
852 | + |
853 | + When Suspend2 does its atomic copy, it calls the driver model suspend |
854 | + and resume methods. If you have DRI enabled with a driver such as fglrx, |
855 | + this can result in the driver allocating a substantial amount of memory |
856 | + for storing its state. Extra_pages_allowance tells suspend2 how much |
857 | + extra memory it should ensure is available for those allocations. If |
858 | + your attempts at suspending end with a message in dmesg indicating that |
859 | + insufficient extra pages were allowed, you need to increase this value. |
860 | + |
861 | + - filewriter/target: |
862 | + |
863 | + Read this value to get the current setting. Write to it to point Suspend |
864 | + at a new storage location for the filewriter. See above for details of how |
865 | + to set up the filewriter. |
866 | + |
867 | + - freezer_test |
868 | + |
869 | + This entry can be used to get Suspend2 to just test the freezer without |
870 | + actually doing a suspend cycle. It is useful for diagnosing freezing |
871 | + issues. |
872 | + |
873 | + - image_exists: |
874 | + |
875 | + Can be used in a script to determine whether a valid image exists at the |
876 | + location currently pointed to by resume2=. Returns up to three lines. |
877 | + The first is whether an image exists (-1 for unsure, otherwise 0 or 1). |
878 | + If an image eixsts, additional lines will return the machine and version. |
879 | + Echoing anything to this entry removes any current image. |
880 | + |
881 | + - image_size_limit: |
882 | + |
883 | + The maximum size of suspend image written to disk, measured in megabytes |
884 | + (1024*1024). |
885 | + |
886 | + - interface_version: |
887 | + |
888 | + The value returned by this file can be used by scripts and configuration |
889 | + tools to determine what entries should be looked for. The value is |
890 | + incremented whenever an entry in /sys/power/suspend2 is obsoleted or |
891 | + added. |
892 | + |
893 | + - last_result: |
894 | + |
895 | + The result of the last suspend, as defined in |
896 | + include/linux/suspend-debug.h with the values SUSPEND_ABORTED to |
897 | + SUSPEND_KEPT_IMAGE. This is a bitmask. |
898 | + |
899 | + - log_everything (CONFIG_PM_DEBUG): |
900 | + |
901 | + Setting this option results in all messages printed being logged. Normally, |
902 | + only a subset are logged, so as to not slow the process and not clutter the |
903 | + logs. Useful for debugging. It can be toggled during a cycle by pressing |
904 | + 'L'. |
905 | + |
906 | + - pause_between_steps (CONFIG_PM_DEBUG): |
907 | + |
908 | + This option is used during debugging, to make Suspend2 pause between |
909 | + each step of the process. It is ignored when the nice display is on. |
910 | + |
911 | + - powerdown_method: |
912 | + |
913 | + Used to select a method by which Suspend2 should powerdown after writing the |
914 | + image. Currently: |
915 | + |
916 | + 0: Don't use ACPI to power off. |
917 | + 3: Attempt to enter Suspend-to-ram. |
918 | + 4: Attempt to enter ACPI S4 mode. |
919 | + 5: Attempt to power down via ACPI S5 mode. |
920 | + |
921 | + Note that these options are highly dependant upon your hardware & software: |
922 | + |
923 | + 3: When succesful, your machine suspends-to-ram instead of powering off. |
924 | + The advantage of using this mode is that it doesn't matter whether your |
925 | + battery has enough charge to make it through to your next resume. If it |
926 | + lasts, you will simply resume from suspend to ram (and the image on disk |
927 | + will be discarded). If the battery runs out, you will resume from disk |
928 | + instead. The disadvantage is that it takes longer than a normal |
929 | + suspend-to-ram to enter the state, since the suspend-to-disk image needs |
930 | + to be written first. |
931 | + 4/5: When successful, your machine will be off and comsume (almost) no power. |
932 | + But it might still react to some external events like opening the lid or |
933 | + trafic on a network or usb device. For the bios, resume is then the same |
934 | + as warm boot, similar to a situation where you used the command `reboot' |
935 | + to reboot your machine. If your machine has problems on warm boot or if |
936 | + you want to protect your machine with the bios password, this is probably |
937 | + not the right choice. Mode 4 may be necessary on some machines where ACPI |
938 | + wake up methods need to be run to properly reinitialise hardware after a |
939 | + suspend-to-disk cycle. |
940 | + 0: Switch the machine completely off. The only possible wakeup is the power |
941 | + button. For the bios, resume is then the same as a cold boot, in |
942 | + particular you would have to provide your bios boot password if your |
943 | + machine uses that feature for booting. |
944 | + |
945 | + - progressbar_granularity_limit: |
946 | + |
947 | + This option can be used to limit the granularity of the progress bar |
948 | + displayed with a bootsplash screen. The value is the maximum number of |
949 | + steps. That is, 10 will make the progress bar jump in 10% increments. |
950 | + |
951 | + - reboot: |
952 | + |
953 | + This option causes Suspend2 to reboot rather than powering down |
954 | + at the end of saving an image. It can be toggled during a cycle by pressing |
955 | + 'R'. |
956 | + |
957 | + - resume_commandline: |
958 | + |
959 | + This entry can be read after resuming to see the commandline that was used |
960 | + when resuming began. You might use this to set up two bootloader entries |
961 | + that are the same apart from the fact that one includes a extra append= |
962 | + argument "at_work=1". You could then grep resume_commandline in your |
963 | + post-resume scripts and configure networking (for example) differently |
964 | + depending upon whether you're at home or work. resume_commandline can be |
965 | + set to arbitrary text if you wish to remove sensitive contents. |
966 | + |
967 | + - swapwriter/swapfilename: |
968 | + |
969 | + This entry is used to specify the swapfile or partition that |
970 | + Suspend2 will attempt to swapon/swapoff automatically. Thus, if |
971 | + I normally use /dev/hda1 for swap, and want to use /dev/hda2 for specifically |
972 | + for my suspend image, I would |
973 | + |
974 | + echo /dev/hda2 > /sys/power/suspend2/swapwriter/swapfile |
975 | + |
976 | + /dev/hda2 would then be automatically swapon'd and swapoff'd. Note that the |
977 | + swapon and swapoff occur while other processes are frozen (including kswapd) |
978 | + so this swap file will not be used up when attempting to free memory. The |
979 | + parition/file is also given the highest priority, so other swapfiles/partitions |
980 | + will only be used to save the image when this one is filled. |
981 | + |
982 | + The value of this file is used by headerlocations along with any currently |
983 | + activated swapfiles/partitions. |
984 | + |
985 | + - swapwriter/headerlocations: |
986 | + |
987 | + This option tells you the resume2= options to use for swap devices you |
988 | + currently have activated. It is particularly useful when you only want to |
989 | + use a swap file to store your image. See above for further details. |
990 | + |
991 | + - toggle_process_nofreeze |
992 | + |
993 | + This entry can be used to toggle the NOFREEZE flag on a process, to allow it |
994 | + to run during Suspending. It should be used with extreme caution. There are |
995 | + strict limitations on what a process running during suspend can do. This is |
996 | + really only intended for use by Suspend's helpers (userui in particular). |
997 | + |
998 | + - userui_program |
999 | + |
1000 | + This entry is used to tell Suspend what userspace program to use for |
1001 | + providing a user interface while suspending. The program uses a netlink |
1002 | + socket to pass messages back and forward to the kernel, allowing all of the |
1003 | + functions formerly implemented in the kernel user interface components. |
1004 | + |
1005 | + - user_interface/debug_sections (CONFIG_PM_DEBUG): |
1006 | + |
1007 | + This value, together with the console log level, controls what debugging |
1008 | + information is displayed. The console log level determines the level of |
1009 | + detail, and this value determines what detail is displayed. This value is |
1010 | + a bit vector, and the meaning of the bits can be found in the kernel tree |
1011 | + in include/linux/suspend2.h. It can be overridden using the kernel's |
1012 | + command line option suspend_dbg. |
1013 | + |
1014 | + - user_interface/default_console_level (CONFIG_PM_DEBUG): |
1015 | + |
1016 | + This determines the value of the console log level at the start of a |
1017 | + suspend cycle. If debugging is compiled in, the console log level can be |
1018 | + changed during a cycle by pressing the digit keys. Meanings are: |
1019 | + |
1020 | + 0: Nice display. |
1021 | + 1: Nice display plus numerical progress. |
1022 | + 2: Errors only. |
1023 | + 3: Low level debugging info. |
1024 | + 4: Medium level debugging info. |
1025 | + 5: High level debugging info. |
1026 | + 6: Verbose debugging info. |
1027 | + |
1028 | + - user_interface/enable_escape: |
1029 | + |
1030 | + Setting this to "1" will enable you abort a suspend by |
1031 | + pressing escape, "0" (default) disables this feature. Note that enabling |
1032 | + this option means that you cannot initiate a suspend and then walk away |
1033 | + from your computer, expecting it to be secure. With feature disabled, |
1034 | + you can validly have this expectation once Suspend begins to write the |
1035 | + image to disk. (Prior to this point, it is possible that Suspend might |
1036 | + about because of failure to freeze all processes or because constraints |
1037 | + on its ability to save the image are not met). |
1038 | + |
1039 | + - version: |
1040 | + |
1041 | + The version of suspend you have compiled into the currently running kernel. |
1042 | + |
1043 | +7. How do you get support? |
1044 | + |
1045 | + Glad you asked. Suspend2 is being actively maintained and supported |
1046 | + by Nigel (the guy doing most of the kernel coding at the moment), Bernard |
1047 | + (who maintains the hibernate script and userspace user interface components) |
1048 | + and its users. |
1049 | + |
1050 | + Resources availble include HowTos, FAQs and a Wiki, all available via |
1051 | + suspend2.net. You can find the mailing lists there. |
1052 | + |
1053 | +8. I think I've found a bug. What should I do? |
1054 | + |
1055 | + By far and a way, the most common problems people have with suspend2 |
1056 | + related to drivers not having adequate power management support. In this |
1057 | + case, it is not a bug with suspend2, but we can still help you. As we |
1058 | + mentioned above, such issues can usually be worked around by building the |
1059 | + functionality as modules and unloading them while suspending. Please visit |
1060 | + the Wiki for up-to-date lists of known issues and work arounds. |
1061 | + |
1062 | + If this information doesn't help, try running: |
1063 | + |
1064 | + hibernate --bug-report |
1065 | + |
1066 | + ..and sending the output to the users mailing list. |
1067 | + |
1068 | + Good information on how to provide us with useful information from an |
1069 | + oops is found in the file REPORTING-BUGS, in the top level directory |
1070 | + of the kernel tree. If you get an oops, please especially note the |
1071 | + information about running what is printed on the screen through ksymoops. |
1072 | + The raw information is useless. |
1073 | + |
1074 | +9. When will XXX be supported? |
1075 | + |
1076 | + If there's a feature missing from Suspend2 that you'd like, feel free to |
1077 | + ask. We try to be obliging, within reason. |
1078 | + |
1079 | + Patches are welcome. Please send to the list. |
1080 | + |
1081 | +10. How does it work? |
1082 | + |
1083 | + Suspend2 does its work in a number of steps. |
1084 | + |
1085 | + a. Freezing system activity. |
1086 | + |
1087 | + The first main stage in suspending is to stop all other activity. This is |
1088 | + achieved in stages. Processes are considered in fours groups, which we will |
1089 | + describe in reverse order for clarity's sake: Threads with the PF_NOFREEZE |
1090 | + flag, kernel threads without this flag, userspace processes with the |
1091 | + PF_SYNCTHREAD flag and all other processes. The first set (PF_NOFREEZE) are |
1092 | + untouched by the refrigerator code. They are allowed to run during suspending |
1093 | + and resuming, and are used to support user interaction, storage access or the |
1094 | + like. Other kernel threads (those unneeded while suspending) are frozen last. |
1095 | + This leaves us with userspace processes that need to be frozen. When a |
1096 | + process enters one of the *_sync system calls, we set a PF_SYNCTHREAD flag on |
1097 | + that process for the duration of that call. Processes that have this flag are |
1098 | + frozen after processes without it, so that we can seek to ensure that dirty |
1099 | + data is synced to disk as quickly as possible in a situation where other |
1100 | + processes may be submitting writes at the same time. Freezing the processes |
1101 | + that are submitting data stops new I/O from being submitted. Syncthreads can |
1102 | + then cleanly finish their work. So the order is: |
1103 | + |
1104 | + - Userspace processes without PF_SYNCTHREAD or PF_NOFREEZE; |
1105 | + - Userspace processes with PF_SYNCTHREAD (they won't have NOFREEZE); |
1106 | + - Kernel processes without PF_NOFREEZE. |
1107 | + |
1108 | + b. Eating memory. |
1109 | + |
1110 | + For a successful suspend, you need to have enough disk space to store the |
1111 | + image and enough memory for the various limitations of Suspend2's |
1112 | + algorithm. You can also specify a maximum image size. In order to attain |
1113 | + to those constraints, Suspend2 may 'eat' memory. If, after freezing |
1114 | + processes, the constraints aren't met, Suspend2 will thaw all the |
1115 | + other processes and begin to eat memory until its calculations indicate |
1116 | + the constraints are met. It will then freeze processes again and recheck |
1117 | + its calculations. |
1118 | + |
1119 | + c. Allocation of storage. |
1120 | + |
1121 | + Next, Suspend2 allocates the storage that will be used to save |
1122 | + the image. |
1123 | + |
1124 | + The core of Suspend2 knows nothing about how or where pages are stored. We |
1125 | + therefore request the active writer (remember you might have compiled in |
1126 | + more than one!) to allocate enough storage for our expect image size. If |
1127 | + this request cannot be fulfilled, we eat more memory and try again. If it |
1128 | + is fulfiled, we seek to allocate additional storage, just in case our |
1129 | + expected compression ratio (if any) isn't achieved. This time, however, we |
1130 | + just continue if we can't allocate enough storage. |
1131 | + |
1132 | + If these calls to our writer change the characteristics of the image such |
1133 | + that we haven't allocated enough memory, we also loop. (The writer may well |
1134 | + need to allocate space for its storage information). |
1135 | + |
1136 | + d. Write the first part of the image. |
1137 | + |
1138 | + Suspend2 stores the image in two sets of pages called 'pagesets'. |
1139 | + Pageset 2 contains pages on the active and inactive lists; essentially |
1140 | + the page cache. Pageset 1 contains all other pages, including the kernel. |
1141 | + We use two pagesets for one important reason: We need to make an atomic copy |
1142 | + of the kernel to ensure consistency of the image. Without a second pageset, |
1143 | + that would limit us to an image that was at most half the amount of memory |
1144 | + available. Using two pagesets allows us to store a full image. Since pageset |
1145 | + 2 pages won't be needed in saving pageset 1, we first save pageset 2 pages. |
1146 | + We can then make our atomic copy of the remaining pages using both pageset 2 |
1147 | + pages and any other pages that are free. While saving both pagesets, we are |
1148 | + careful not to corrupt the image. Among other things, we use lowlevel block |
1149 | + I/O routines that don't change the pagecache contents. |
1150 | + |
1151 | + The next step, then, is writing pageset 2. |
1152 | + |
1153 | + e. Suspending drivers and storing processor context. |
1154 | + |
1155 | + Having written pageset2, Suspend2 calls the power management functions to |
1156 | + notify drivers of the suspend, and saves the processor state in preparation |
1157 | + for the atomic copy of memory we are about to make. |
1158 | + |
1159 | + f. Atomic copy. |
1160 | + |
1161 | + At this stage, everything else but the Suspend2 code is halted. Processes |
1162 | + are frozen or idling, drivers are quiesced and have stored (ideally and where |
1163 | + necessary) their configuration in memory we are about to atomically copy. |
1164 | + In our lowlevel architecture specific code, we have saved the CPU state. |
1165 | + We can therefore now do our atomic copy before resuming drivers etc. |
1166 | + |
1167 | + g. Save the atomic copy (pageset 1). |
1168 | + |
1169 | + Suspend can then write the atomic copy of the remaining pages. Since we |
1170 | + have copied the pages into other locations, we can continue to use the |
1171 | + normal block I/O routines without fear of corruption our image. |
1172 | + |
1173 | + f. Save the suspend header. |
1174 | + |
1175 | + Nearly there! We save our settings and other parameters needed for |
1176 | + reloading pageset 1 in a 'suspend header'. We also tell our writer to |
1177 | + serialise its data at this stage, so that it can reread the image at resume |
1178 | + time. Note that the writer can write this data in any format - in the case |
1179 | + of the swapwriter, for example, it splits header pages in 4092 byte blocks, |
1180 | + using the last four bytes to link pages of data together. This is completely |
1181 | + transparent to the core. |
1182 | + |
1183 | + g. Set the image header. |
1184 | + |
1185 | + Finally, we edit the header at our resume2= location. The signature is |
1186 | + changed by the writer to reflect the fact that an image exists, and to point |
1187 | + to the start of that data if necessary (swapwriter). |
1188 | + |
1189 | + h. Power down. |
1190 | + |
1191 | + Or reboot if we're debugging and the appropriate option is selected. |
1192 | + |
1193 | + Whew! |
1194 | + |
1195 | + Reloading the image. |
1196 | + -------------------- |
1197 | + |
1198 | + Reloading the image is essentially the reverse of all the above. We load |
1199 | + our copy of pageset 1, being careful to choose locations that aren't going |
1200 | + to be overwritten as we copy it back (We start very early in the boot |
1201 | + process, so there are no other processes to quiesce here). We then copy |
1202 | + pageset 1 back to its original location in memory and restore the process |
1203 | + context. We are now running with the original kernel. Next, we reload the |
1204 | + pageset 2 pages, free the memory and swap used by Suspend2, restore |
1205 | + the pageset header and restart processes. Sounds easy in comparison to |
1206 | + suspending, doesn't it! |
1207 | + |
1208 | + There is of course more to Suspend2 than this, but this explanation |
1209 | + should be a good start. If there's interest, I'll write further |
1210 | + documentation on range pages and the low level I/O. |
1211 | + |
1212 | +11. Who wrote Suspend2? |
1213 | + |
1214 | + (Answer based on the writings of Florent Chabaud, credits in files and |
1215 | + Nigel's limited knowledge; apologies to anyone missed out!) |
1216 | + |
1217 | + The main developers of Suspend2 have been... |
1218 | + |
1219 | + Gabor Kuti |
1220 | + Pavel Machek |
1221 | + Florent Chabaud |
1222 | + Bernard Blackham |
1223 | + Nigel Cunningham |
1224 | + |
1225 | + They have been aided in their efforts by a host of hundreds, if not thousands |
1226 | + of testers and people who have submitted bug fixes & suggestions. Of special |
1227 | + note are the efforts of Michael Frank, who had his computers repetitively |
1228 | + suspend and resume for literally tens of thousands of cycles and developed |
1229 | + scripts to stress the system and test Suspend2 far beyond the point |
1230 | + most of us (Nigel included!) would consider testing. His efforts have |
1231 | + contributed as much to Suspend2 as any of the names above. |
1232 | diff --git a/MAINTAINERS b/MAINTAINERS |
1233 | index 277877a..f1adba1 100644 |
1234 | --- a/MAINTAINERS |
1235 | +++ b/MAINTAINERS |
1236 | @@ -3218,6 +3218,13 @@ M: sammy@sammy.net |
1237 | W: http://sammy.net/sun3/ |
1238 | S: Maintained |
1239 | |
1240 | +SUSPEND2 |
1241 | +P: Nigel Cunningham |
1242 | +M: nigel@suspend2.net |
1243 | +L: suspend2-devel@suspend2.net |
1244 | +W: http://suspend2.net |
1245 | +S: Maintained |
1246 | + |
1247 | SVGA HANDLING |
1248 | P: Martin Mares |
1249 | M: mj@ucw.cz |
1250 | diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c |
1251 | index b8c4e25..21982d9 100644 |
1252 | --- a/arch/i386/mm/fault.c |
1253 | +++ b/arch/i386/mm/fault.c |
1254 | @@ -23,6 +23,7 @@ |
1255 | #include <linux/module.h> |
1256 | #include <linux/kprobes.h> |
1257 | #include <linux/uaccess.h> |
1258 | +#include <linux/suspend.h> |
1259 | |
1260 | #include <asm/system.h> |
1261 | #include <asm/desc.h> |
1262 | @@ -33,6 +34,9 @@ extern void die(const char *,struct pt_regs *,long); |
1263 | |
1264 | static ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain); |
1265 | |
1266 | +int suspend2_faulted = 0; |
1267 | +EXPORT_SYMBOL(suspend2_faulted); |
1268 | + |
1269 | int register_page_fault_notifier(struct notifier_block *nb) |
1270 | { |
1271 | vmalloc_sync_all(); |
1272 | @@ -311,6 +315,20 @@ fastcall void __kprobes do_page_fault(struct pt_regs *regs, |
1273 | |
1274 | si_code = SEGV_MAPERR; |
1275 | |
1276 | + /* During a Suspend2 atomic copy, with DEBUG_SLAB, we will |
1277 | + * get page faults where slab has been unmapped. Map them |
1278 | + * temporarily and set the variable that tells Suspend2 to |
1279 | + * unmap afterwards. |
1280 | + */ |
1281 | + |
1282 | + if (unlikely(suspend2_running && !suspend2_faulted)) { |
1283 | + struct page *page = NULL; |
1284 | + suspend2_faulted = 1; |
1285 | + page = virt_to_page(address); |
1286 | + kernel_map_pages(page, 1, 1); |
1287 | + return; |
1288 | + } |
1289 | + |
1290 | /* |
1291 | * We fault-in kernel-space virtual memory on-demand. The |
1292 | * 'reference' page table is init_mm.pgd. |
1293 | diff --git a/arch/i386/mm/init.c b/arch/i386/mm/init.c |
1294 | index ae43688..a180d21 100644 |
1295 | --- a/arch/i386/mm/init.c |
1296 | +++ b/arch/i386/mm/init.c |
1297 | @@ -387,7 +387,7 @@ static void __init pagetable_init (void) |
1298 | #endif |
1299 | } |
1300 | |
1301 | -#if defined(CONFIG_SOFTWARE_SUSPEND) || defined(CONFIG_ACPI_SLEEP) |
1302 | +#if defined(CONFIG_SUSPEND_SHARED) || defined(CONFIG_ACPI_SLEEP) |
1303 | /* |
1304 | * Swap suspend & friends need this for resume because things like the intel-agp |
1305 | * driver might have split up a kernel 4MB mapping. |
1306 | @@ -774,13 +774,13 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end) |
1307 | unsigned long addr; |
1308 | |
1309 | for (addr = begin; addr < end; addr += PAGE_SIZE) { |
1310 | - ClearPageReserved(virt_to_page(addr)); |
1311 | - init_page_count(virt_to_page(addr)); |
1312 | + //ClearPageReserved(virt_to_page(addr)); |
1313 | + //init_page_count(virt_to_page(addr)); |
1314 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); |
1315 | - free_page(addr); |
1316 | - totalram_pages++; |
1317 | + //free_page(addr); |
1318 | + //totalram_pages++; |
1319 | } |
1320 | - printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); |
1321 | + //printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); |
1322 | } |
1323 | |
1324 | void free_initmem(void) |
1325 | diff --git a/arch/i386/mm/pageattr.c b/arch/i386/mm/pageattr.c |
1326 | index 412ebbd..dded2e1 100644 |
1327 | --- a/arch/i386/mm/pageattr.c |
1328 | +++ b/arch/i386/mm/pageattr.c |
1329 | @@ -252,7 +252,27 @@ void kernel_map_pages(struct page *page, int numpages, int enable) |
1330 | */ |
1331 | __flush_tlb_all(); |
1332 | } |
1333 | +EXPORT_SYMBOL(kernel_map_pages); |
1334 | #endif |
1335 | |
1336 | +int page_is_mapped(struct page *page) |
1337 | +{ |
1338 | + pte_t *kpte; |
1339 | + unsigned long address; |
1340 | + struct page *kpte_page; |
1341 | + |
1342 | + if(PageHighMem(page)) |
1343 | + return 0; |
1344 | + |
1345 | + address = (unsigned long)page_address(page); |
1346 | + |
1347 | + kpte = lookup_address(address); |
1348 | + if (!kpte) |
1349 | + return -EINVAL; |
1350 | + kpte_page = virt_to_page(kpte); |
1351 | + |
1352 | + return (pte_val(*kpte) & (__PAGE_KERNEL_EXEC | __PAGE_KERNEL)) ? 1:0; |
1353 | +} |
1354 | EXPORT_SYMBOL(change_page_attr); |
1355 | EXPORT_SYMBOL(global_flush_tlb); |
1356 | +EXPORT_SYMBOL(page_is_mapped); |
1357 | diff --git a/arch/i386/power/Makefile b/arch/i386/power/Makefile |
1358 | index 2de7bbf..72a6169 100644 |
1359 | --- a/arch/i386/power/Makefile |
1360 | +++ b/arch/i386/power/Makefile |
1361 | @@ -1,2 +1,2 @@ |
1362 | obj-$(CONFIG_PM) += cpu.o |
1363 | -obj-$(CONFIG_SOFTWARE_SUSPEND) += swsusp.o suspend.o |
1364 | +obj-$(CONFIG_SUSPEND_SHARED) += swsusp.o suspend.o |
1365 | diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile |
1366 | index 8120d42..5d57f0c 100644 |
1367 | --- a/arch/powerpc/kernel/Makefile |
1368 | +++ b/arch/powerpc/kernel/Makefile |
1369 | @@ -36,7 +36,7 @@ obj-$(CONFIG_GENERIC_TBSYNC) += smp-tbsync.o |
1370 | obj-$(CONFIG_CRASH_DUMP) += crash_dump.o |
1371 | obj-$(CONFIG_6xx) += idle_6xx.o l2cr_6xx.o cpu_setup_6xx.o |
1372 | obj-$(CONFIG_TAU) += tau_6xx.o |
1373 | -obj32-$(CONFIG_SOFTWARE_SUSPEND) += swsusp_32.o |
1374 | +obj32-$(CONFIG_SUSPEND_SHARED) += swsusp_32.o |
1375 | obj32-$(CONFIG_MODULES) += module_32.o |
1376 | |
1377 | ifeq ($(CONFIG_PPC_MERGE),y) |
1378 | diff --git a/arch/powerpc/platforms/powermac/setup.c b/arch/powerpc/platforms/powermac/setup.c |
1379 | index 651fa42..243e5f4 100644 |
1380 | --- a/arch/powerpc/platforms/powermac/setup.c |
1381 | +++ b/arch/powerpc/platforms/powermac/setup.c |
1382 | @@ -425,7 +425,7 @@ static void __init find_boot_device(void) |
1383 | * only |
1384 | */ |
1385 | |
1386 | -#ifdef CONFIG_SOFTWARE_SUSPEND |
1387 | +#ifdef CONFIG_SUSPEND_SHARED |
1388 | |
1389 | static int pmac_pm_prepare(suspend_state_t state) |
1390 | { |
1391 | @@ -480,16 +480,16 @@ static struct pm_ops pmac_pm_ops = { |
1392 | .valid = pmac_pm_valid, |
1393 | }; |
1394 | |
1395 | -#endif /* CONFIG_SOFTWARE_SUSPEND */ |
1396 | +#endif /* CONFIG_SUSPEND_SHARED */ |
1397 | |
1398 | static int initializing = 1; |
1399 | |
1400 | static int pmac_late_init(void) |
1401 | { |
1402 | initializing = 0; |
1403 | -#ifdef CONFIG_SOFTWARE_SUSPEND |
1404 | +#ifdef CONFIG_SUSPEND_SHARED |
1405 | pm_set_ops(&pmac_pm_ops); |
1406 | -#endif /* CONFIG_SOFTWARE_SUSPEND */ |
1407 | +#endif /* CONFIG_SUSPEND_SHARED */ |
1408 | return 0; |
1409 | } |
1410 | |
1411 | diff --git a/arch/x86_64/kernel/Makefile b/arch/x86_64/kernel/Makefile |
1412 | index bb47e86..9943190 100644 |
1413 | --- a/arch/x86_64/kernel/Makefile |
1414 | +++ b/arch/x86_64/kernel/Makefile |
1415 | @@ -26,7 +26,7 @@ obj-y += io_apic.o mpparse.o \ |
1416 | obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o crash.o |
1417 | obj-$(CONFIG_CRASH_DUMP) += crash_dump.o |
1418 | obj-$(CONFIG_PM) += suspend.o |
1419 | -obj-$(CONFIG_SOFTWARE_SUSPEND) += suspend_asm.o |
1420 | +obj-$(CONFIG_SUSPEND_SHARED) += suspend_asm.o |
1421 | obj-$(CONFIG_CPU_FREQ) += cpufreq/ |
1422 | obj-$(CONFIG_EARLY_PRINTK) += early_printk.o |
1423 | obj-$(CONFIG_IOMMU) += pci-gart.o aperture.o |
1424 | diff --git a/arch/x86_64/kernel/suspend.c b/arch/x86_64/kernel/suspend.c |
1425 | index 91f7e67..983f16f 100644 |
1426 | --- a/arch/x86_64/kernel/suspend.c |
1427 | +++ b/arch/x86_64/kernel/suspend.c |
1428 | @@ -140,7 +140,7 @@ void fix_processor_context(void) |
1429 | |
1430 | } |
1431 | |
1432 | -#ifdef CONFIG_SOFTWARE_SUSPEND |
1433 | +#ifdef CONFIG_SUSPEND_SHARED |
1434 | /* Defined in arch/x86_64/kernel/suspend_asm.S */ |
1435 | extern int restore_image(void); |
1436 | |
1437 | @@ -219,4 +219,4 @@ int swsusp_arch_resume(void) |
1438 | restore_image(); |
1439 | return 0; |
1440 | } |
1441 | -#endif /* CONFIG_SOFTWARE_SUSPEND */ |
1442 | +#endif /* CONFIG_SUSPEND_SHARED */ |
1443 | diff --git a/crypto/Kconfig b/crypto/Kconfig |
1444 | index 086fcec..efde46c 100644 |
1445 | --- a/crypto/Kconfig |
1446 | +++ b/crypto/Kconfig |
1447 | @@ -406,6 +406,14 @@ config CRYPTO_DEFLATE |
1448 | |
1449 | You will most probably want this if using IPSec. |
1450 | |
1451 | +config CRYPTO_LZF |
1452 | + tristate "LZF compression algorithm" |
1453 | + default y |
1454 | + select CRYPTO_ALGAPI |
1455 | + help |
1456 | + This is the LZF algorithm. It is especially useful for Suspend2, |
1457 | + because it achieves good compression quickly. |
1458 | + |
1459 | config CRYPTO_MICHAEL_MIC |
1460 | tristate "Michael MIC keyed digest algorithm" |
1461 | select CRYPTO_ALGAPI |
1462 | diff --git a/crypto/Makefile b/crypto/Makefile |
1463 | index 12f93f5..69a8af3 100644 |
1464 | --- a/crypto/Makefile |
1465 | +++ b/crypto/Makefile |
1466 | @@ -46,5 +46,6 @@ obj-$(CONFIG_CRYPTO_ANUBIS) += anubis.o |
1467 | obj-$(CONFIG_CRYPTO_DEFLATE) += deflate.o |
1468 | obj-$(CONFIG_CRYPTO_MICHAEL_MIC) += michael_mic.o |
1469 | obj-$(CONFIG_CRYPTO_CRC32C) += crc32c.o |
1470 | +obj-$(CONFIG_CRYPTO_LZF) += lzf.o |
1471 | |
1472 | obj-$(CONFIG_CRYPTO_TEST) += tcrypt.o |
1473 | diff --git a/crypto/lzf.c b/crypto/lzf.c |
1474 | new file mode 100644 |
1475 | index 0000000..7c74784 |
1476 | --- /dev/null |
1477 | +++ b/crypto/lzf.c |
1478 | @@ -0,0 +1,325 @@ |
1479 | +/* |
1480 | + * Cryptoapi LZF compression module. |
1481 | + * |
1482 | + * Copyright (c) 2004-2005 Nigel Cunningham <nigel@suspend2.net> |
1483 | + * |
1484 | + * based on the deflate.c file: |
1485 | + * |
1486 | + * Copyright (c) 2003 James Morris <jmorris@intercode.com.au> |
1487 | + * |
1488 | + * and upon the LZF compression module donated to the Suspend2 project with |
1489 | + * the following copyright: |
1490 | + * |
1491 | + * This program is free software; you can redistribute it and/or modify it |
1492 | + * under the terms of the GNU General Public License as published by the Free |
1493 | + * Software Foundation; either version 2 of the License, or (at your option) |
1494 | + * any later version. |
1495 | + * Copyright (c) 2000-2003 Marc Alexander Lehmann <pcg@goof.com> |
1496 | + * |
1497 | + * Redistribution and use in source and binary forms, with or without modifica- |
1498 | + * tion, are permitted provided that the following conditions are met: |
1499 | + * |
1500 | + * 1. Redistributions of source code must retain the above copyright notice, |
1501 | + * this list of conditions and the following disclaimer. |
1502 | + * |
1503 | + * 2. Redistributions in binary form must reproduce the above copyright |
1504 | + * notice, this list of conditions and the following disclaimer in the |
1505 | + * documentation and/or other materials provided with the distribution. |
1506 | + * |
1507 | + * 3. The name of the author may not be used to endorse or promote products |
1508 | + * derived from this software without specific prior written permission. |
1509 | + * |
1510 | + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
1511 | + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
1512 | + * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
1513 | + * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
1514 | + * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
1515 | + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
1516 | + * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
1517 | + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
1518 | + * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
1519 | + * OF THE POSSIBILITY OF SUCH DAMAGE. |
1520 | + * |
1521 | + * Alternatively, the contents of this file may be used under the terms of |
1522 | + * the GNU General Public License version 2 (the "GPL"), in which case the |
1523 | + * provisions of the GPL are applicable instead of the above. If you wish to |
1524 | + * allow the use of your version of this file only under the terms of the |
1525 | + * GPL and not to allow others to use your version of this file under the |
1526 | + * BSD license, indicate your decision by deleting the provisions above and |
1527 | + * replace them with the notice and other provisions required by the GPL. If |
1528 | + * you do not delete the provisions above, a recipient may use your version |
1529 | + * of this file under either the BSD or the GPL. |
1530 | + */ |
1531 | + |
1532 | +#include <linux/kernel.h> |
1533 | +#include <linux/module.h> |
1534 | +#include <linux/init.h> |
1535 | +#include <linux/module.h> |
1536 | +#include <linux/crypto.h> |
1537 | +#include <linux/err.h> |
1538 | +#include <linux/vmalloc.h> |
1539 | +#include <asm/string.h> |
1540 | + |
1541 | +struct lzf_ctx { |
1542 | + void *hbuf; |
1543 | + unsigned int bufofs; |
1544 | +}; |
1545 | + |
1546 | +/* |
1547 | + * size of hashtable is (1 << hlog) * sizeof (char *) |
1548 | + * decompression is independent of the hash table size |
1549 | + * the difference between 15 and 14 is very small |
1550 | + * for small blocks (and 14 is also faster). |
1551 | + * For a low-memory configuration, use hlog == 13; |
1552 | + * For best compression, use 15 or 16. |
1553 | + */ |
1554 | +static const int hlog = 14; |
1555 | + |
1556 | +/* |
1557 | + * don't play with this unless you benchmark! |
1558 | + * decompression is not dependent on the hash function |
1559 | + * the hashing function might seem strange, just believe me |
1560 | + * it works ;) |
1561 | + */ |
1562 | +static inline u16 first(const u8 *p) |
1563 | +{ |
1564 | + return ((p[0]) << 8) + p[1]; |
1565 | +} |
1566 | + |
1567 | +static inline u16 next(u8 v, const u8 *p) |
1568 | +{ |
1569 | + return ((v) << 8) + p[2]; |
1570 | +} |
1571 | + |
1572 | +static inline u32 idx(unsigned int h) |
1573 | +{ |
1574 | + return (((h ^ (h << 5)) >> (3*8 - hlog)) + h*3) & ((1 << hlog) - 1); |
1575 | +} |
1576 | + |
1577 | +/* |
1578 | + * IDX works because it is very similar to a multiplicative hash, e.g. |
1579 | + * (h * 57321 >> (3*8 - hlog)) |
1580 | + * the next one is also quite good, albeit slow ;) |
1581 | + * (int)(cos(h & 0xffffff) * 1e6) |
1582 | + */ |
1583 | + |
1584 | +static const int max_lit = (1 << 5); |
1585 | +static const int max_off = (1 << 13); |
1586 | +static const int max_ref = ((1 << 8) + (1 << 3)); |
1587 | + |
1588 | +/* |
1589 | + * compressed format |
1590 | + * |
1591 | + * 000LLLLL <L+1> ; literal |
1592 | + * LLLOOOOO oooooooo ; backref L |
1593 | + * 111OOOOO LLLLLLLL oooooooo ; backref L+7 |
1594 | + * |
1595 | + */ |
1596 | + |
1597 | +static void lzf_compress_exit(struct crypto_tfm *tfm) |
1598 | +{ |
1599 | + struct lzf_ctx *ctx = crypto_tfm_ctx(tfm); |
1600 | + |
1601 | + if (!ctx->hbuf) |
1602 | + return; |
1603 | + |
1604 | + vfree(ctx->hbuf); |
1605 | + ctx->hbuf = NULL; |
1606 | +} |
1607 | + |
1608 | +static int lzf_compress_init(struct crypto_tfm *tfm) |
1609 | +{ |
1610 | + struct lzf_ctx *ctx = crypto_tfm_ctx(tfm); |
1611 | + |
1612 | + /* Get LZF ready to go */ |
1613 | + ctx->hbuf = vmalloc_32((1 << hlog) * sizeof(char *)); |
1614 | + if (ctx->hbuf) |
1615 | + return 0; |
1616 | + |
1617 | + printk(KERN_WARNING "Failed to allocate %ld bytes for lzf workspace\n", |
1618 | + (long) ((1 << hlog) * sizeof(char *))); |
1619 | + return -ENOMEM; |
1620 | +} |
1621 | + |
1622 | +static int lzf_compress(struct crypto_tfm *tfm, const u8 *in_data, |
1623 | + unsigned int in_len, u8 *out_data, unsigned int *out_len) |
1624 | +{ |
1625 | + struct lzf_ctx *ctx = crypto_tfm_ctx(tfm); |
1626 | + const u8 **htab = ctx->hbuf; |
1627 | + const u8 **hslot; |
1628 | + const u8 *ip = in_data; |
1629 | + u8 *op = out_data; |
1630 | + const u8 *in_end = ip + in_len; |
1631 | + u8 *out_end = op + *out_len - 3; |
1632 | + const u8 *ref; |
1633 | + |
1634 | + unsigned int hval = first(ip); |
1635 | + unsigned long off; |
1636 | + int lit = 0; |
1637 | + |
1638 | + memset(htab, 0, sizeof(htab)); |
1639 | + |
1640 | + for (;;) { |
1641 | + if (ip < in_end - 2) { |
1642 | + hval = next(hval, ip); |
1643 | + hslot = htab + idx(hval); |
1644 | + ref = *hslot; |
1645 | + *hslot = ip; |
1646 | + |
1647 | + if ((off = ip - ref - 1) < max_off |
1648 | + && ip + 4 < in_end && ref > in_data |
1649 | + && *(u16 *) ref == *(u16 *) ip && ref[2] == ip[2] |
1650 | + ) { |
1651 | + /* match found at *ref++ */ |
1652 | + unsigned int len = 2; |
1653 | + unsigned int maxlen = in_end - ip - len; |
1654 | + maxlen = maxlen > max_ref ? max_ref : maxlen; |
1655 | + |
1656 | + do |
1657 | + len++; |
1658 | + while (len < maxlen && ref[len] == ip[len]); |
1659 | + |
1660 | + if (op + lit + 1 + 3 >= out_end) { |
1661 | + *out_len = PAGE_SIZE; |
1662 | + return 0; |
1663 | + } |
1664 | + |
1665 | + if (lit) { |
1666 | + *op++ = lit - 1; |
1667 | + lit = -lit; |
1668 | + do |
1669 | + *op++ = ip[lit]; |
1670 | + while (++lit); |
1671 | + } |
1672 | + |
1673 | + len -= 2; |
1674 | + ip++; |
1675 | + |
1676 | + if (len < 7) { |
1677 | + *op++ = (off >> 8) + (len << 5); |
1678 | + } else { |
1679 | + *op++ = (off >> 8) + (7 << 5); |
1680 | + *op++ = len - 7; |
1681 | + } |
1682 | + |
1683 | + *op++ = off; |
1684 | + |
1685 | + ip += len; |
1686 | + hval = first(ip); |
1687 | + hval = next(hval, ip); |
1688 | + htab[idx(hval)] = ip; |
1689 | + ip++; |
1690 | + continue; |
1691 | + } |
1692 | + } else if (ip == in_end) |
1693 | + break; |
1694 | + |
1695 | + /* one more literal byte we must copy */ |
1696 | + lit++; |
1697 | + ip++; |
1698 | + |
1699 | + if (lit == max_lit) { |
1700 | + if (op + 1 + max_lit >= out_end) { |
1701 | + *out_len = PAGE_SIZE; |
1702 | + return 0; |
1703 | + } |
1704 | + |
1705 | + *op++ = max_lit - 1; |
1706 | + memcpy(op, ip - max_lit, max_lit); |
1707 | + op += max_lit; |
1708 | + lit = 0; |
1709 | + } |
1710 | + } |
1711 | + |
1712 | + if (lit) { |
1713 | + if (op + lit + 1 >= out_end) { |
1714 | + *out_len = PAGE_SIZE; |
1715 | + return 0; |
1716 | + } |
1717 | + |
1718 | + *op++ = lit - 1; |
1719 | + lit = -lit; |
1720 | + do |
1721 | + *op++ = ip[lit]; |
1722 | + while (++lit); |
1723 | + } |
1724 | + |
1725 | + *out_len = op - out_data; |
1726 | + return 0; |
1727 | +} |
1728 | + |
1729 | +static int lzf_decompress(struct crypto_tfm *tfm, const u8 *src, |
1730 | + unsigned int slen, u8 *dst, unsigned int *dlen) |
1731 | +{ |
1732 | + u8 const *ip = src; |
1733 | + u8 *op = dst; |
1734 | + u8 const *const in_end = ip + slen; |
1735 | + u8 *const out_end = op + *dlen; |
1736 | + |
1737 | + *dlen = PAGE_SIZE; |
1738 | + do { |
1739 | + unsigned int ctrl = *ip++; |
1740 | + |
1741 | + if (ctrl < (1 << 5)) { /* literal run */ |
1742 | + ctrl++; |
1743 | + |
1744 | + if (op + ctrl > out_end) |
1745 | + return 0; |
1746 | + memcpy(op, ip, ctrl); |
1747 | + op += ctrl; |
1748 | + ip += ctrl; |
1749 | + } else { /* back reference */ |
1750 | + |
1751 | + unsigned int len = ctrl >> 5; |
1752 | + |
1753 | + u8 *ref = op - ((ctrl & 0x1f) << 8) - 1; |
1754 | + |
1755 | + if (len == 7) |
1756 | + len += *ip++; |
1757 | + |
1758 | + ref -= *ip++; |
1759 | + len += 2; |
1760 | + |
1761 | + if (op + len > out_end || ref < (u8 *) dst) |
1762 | + return 0; |
1763 | + |
1764 | + do |
1765 | + *op++ = *ref++; |
1766 | + while (--len); |
1767 | + } |
1768 | + } |
1769 | + while (op < out_end && ip < in_end); |
1770 | + |
1771 | + *dlen = op - (u8 *) dst; |
1772 | + return 0; |
1773 | +} |
1774 | + |
1775 | +static struct crypto_alg alg = { |
1776 | + .cra_name = "lzf", |
1777 | + .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, |
1778 | + .cra_ctxsize = 0, |
1779 | + .cra_module = THIS_MODULE, |
1780 | + .cra_list = LIST_HEAD_INIT(alg.cra_list), |
1781 | + .cra_init = lzf_compress_init, |
1782 | + .cra_exit = lzf_compress_exit, |
1783 | + .cra_u = { .compress = { |
1784 | + .coa_compress = lzf_compress, |
1785 | + .coa_decompress = lzf_decompress } } |
1786 | +}; |
1787 | + |
1788 | +static int __init init(void) |
1789 | +{ |
1790 | + return crypto_register_alg(&alg); |
1791 | +} |
1792 | + |
1793 | +static void __exit fini(void) |
1794 | +{ |
1795 | + crypto_unregister_alg(&alg); |
1796 | +} |
1797 | + |
1798 | +module_init(init); |
1799 | +module_exit(fini); |
1800 | + |
1801 | +MODULE_LICENSE("GPL"); |
1802 | +MODULE_DESCRIPTION("LZF Compression Algorithm"); |
1803 | +MODULE_AUTHOR("Marc Alexander Lehmann & Nigel Cunningham"); |
1804 | diff --git a/drivers/base/core.c b/drivers/base/core.c |
1805 | index d7fcf82..edbbf76 100644 |
1806 | --- a/drivers/base/core.c |
1807 | +++ b/drivers/base/core.c |
1808 | @@ -27,6 +27,8 @@ |
1809 | int (*platform_notify)(struct device * dev) = NULL; |
1810 | int (*platform_notify_remove)(struct device * dev) = NULL; |
1811 | |
1812 | +static int do_dump_stack; |
1813 | + |
1814 | /* |
1815 | * sysfs bindings for devices. |
1816 | */ |
1817 | @@ -638,6 +640,18 @@ int device_add(struct device *dev) |
1818 | class_intf->add_dev(dev, class_intf); |
1819 | up(&dev->class->sem); |
1820 | } |
1821 | + |
1822 | +#ifdef CONFIG_PM |
1823 | + if (!((dev->class && dev->class->resume) || |
1824 | + (dev->bus && (dev->bus->resume || dev->bus->resume_early))) && |
1825 | + !dev->pm_safe) { |
1826 | + printk("Device driver %s lacks bus and class support for " |
1827 | + "being resumed.\n", kobject_name(&dev->kobj)); |
1828 | + if (do_dump_stack) |
1829 | + dump_stack(); |
1830 | + } |
1831 | +#endif |
1832 | + |
1833 | Done: |
1834 | kfree(class_name); |
1835 | put_device(dev); |
1836 | @@ -975,6 +989,7 @@ struct device *device_create(struct class *class, struct device *parent, |
1837 | dev->class = class; |
1838 | dev->parent = parent; |
1839 | dev->release = device_create_release; |
1840 | + dev->pm_safe = 1; |
1841 | |
1842 | va_start(args, fmt); |
1843 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); |
1844 | @@ -1183,3 +1198,11 @@ out: |
1845 | } |
1846 | |
1847 | EXPORT_SYMBOL_GPL(device_move); |
1848 | + |
1849 | +static int __init pm_debug_dump_stack(char *str) |
1850 | +{ |
1851 | + do_dump_stack = 1; |
1852 | + return 1; |
1853 | +} |
1854 | + |
1855 | +__setup("pm_debug_dump_stack", pm_debug_dump_stack); |
1856 | diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c |
1857 | index b6073bd..32bd423 100644 |
1858 | --- a/drivers/macintosh/via-pmu.c |
1859 | +++ b/drivers/macintosh/via-pmu.c |
1860 | @@ -42,7 +42,6 @@ |
1861 | #include <linux/interrupt.h> |
1862 | #include <linux/device.h> |
1863 | #include <linux/sysdev.h> |
1864 | -#include <linux/freezer.h> |
1865 | #include <linux/syscalls.h> |
1866 | #include <linux/suspend.h> |
1867 | #include <linux/cpu.h> |
1868 | diff --git a/drivers/md/md.c b/drivers/md/md.c |
1869 | index 509171c..76e5ac8 100644 |
1870 | --- a/drivers/md/md.c |
1871 | +++ b/drivers/md/md.c |
1872 | @@ -5309,6 +5309,8 @@ void md_do_sync(mddev_t *mddev) |
1873 | last_mark = next; |
1874 | } |
1875 | |
1876 | + while(freezer_is_on()) |
1877 | + yield(); |
1878 | |
1879 | if (kthread_should_stop()) { |
1880 | /* |
1881 | diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c |
1882 | index a3c1755..171be82 100644 |
1883 | --- a/drivers/pci/pci-driver.c |
1884 | +++ b/drivers/pci/pci-driver.c |
1885 | @@ -451,6 +451,10 @@ int __pci_register_driver(struct pci_driver *drv, struct module *owner, |
1886 | if (error) |
1887 | driver_unregister(&drv->driver); |
1888 | |
1889 | + if (!drv->resume) |
1890 | + printk("PCI driver %s lacks driver specific resume support.\n", |
1891 | + drv->name); |
1892 | + |
1893 | return error; |
1894 | } |
1895 | |
1896 | diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c |
1897 | index 9e3e943..e91fdef 100644 |
1898 | --- a/drivers/usb/core/driver.c |
1899 | +++ b/drivers/usb/core/driver.c |
1900 | @@ -788,6 +788,9 @@ int usb_register_driver(struct usb_driver *new_driver, struct module *owner, |
1901 | usbcore_name, new_driver->name); |
1902 | usbfs_update_special(); |
1903 | usb_create_newid_file(new_driver); |
1904 | + if (!new_driver->resume) |
1905 | + printk("USB driver %s lacks resume support.\n", |
1906 | + new_driver->name); |
1907 | } else { |
1908 | printk(KERN_ERR "%s: error %d registering interface " |
1909 | " driver %s\n", |
1910 | diff --git a/include/asm-i386/cacheflush.h b/include/asm-i386/cacheflush.h |
1911 | index 74e03c8..3bb8575 100644 |
1912 | --- a/include/asm-i386/cacheflush.h |
1913 | +++ b/include/asm-i386/cacheflush.h |
1914 | @@ -36,4 +36,6 @@ void kernel_map_pages(struct page *page, int numpages, int enable); |
1915 | void mark_rodata_ro(void); |
1916 | #endif |
1917 | |
1918 | +extern int page_is_mapped(struct page *page); |
1919 | + |
1920 | #endif /* _I386_CACHEFLUSH_H */ |
1921 | diff --git a/include/asm-i386/suspend.h b/include/asm-i386/suspend.h |
1922 | index 8dbaafe..e23fd20 100644 |
1923 | --- a/include/asm-i386/suspend.h |
1924 | +++ b/include/asm-i386/suspend.h |
1925 | @@ -8,6 +8,9 @@ |
1926 | |
1927 | static inline int arch_prepare_suspend(void) { return 0; } |
1928 | |
1929 | +extern int suspend2_faulted; |
1930 | +#define clear_suspend2_fault() do { suspend2_faulted = 0; } while(0) |
1931 | + |
1932 | /* image of the saved processor state */ |
1933 | struct saved_context { |
1934 | u16 es, fs, gs, ss; |
1935 | diff --git a/include/asm-ppc/suspend.h b/include/asm-ppc/suspend.h |
1936 | index 3df9f32..9d5db0e 100644 |
1937 | --- a/include/asm-ppc/suspend.h |
1938 | +++ b/include/asm-ppc/suspend.h |
1939 | @@ -10,3 +10,6 @@ static inline void save_processor_state(void) |
1940 | static inline void restore_processor_state(void) |
1941 | { |
1942 | } |
1943 | + |
1944 | +#define suspend2_faulted (0) |
1945 | +#define clear_suspend2_fault() do { } while(0) |
1946 | diff --git a/include/asm-x86_64/cacheflush.h b/include/asm-x86_64/cacheflush.h |
1947 | index ab1cb5c..b8e7def 100644 |
1948 | --- a/include/asm-x86_64/cacheflush.h |
1949 | +++ b/include/asm-x86_64/cacheflush.h |
1950 | @@ -32,4 +32,9 @@ int change_page_attr_addr(unsigned long addr, int numpages, pgprot_t prot); |
1951 | void mark_rodata_ro(void); |
1952 | #endif |
1953 | |
1954 | +static inline int page_is_mapped(struct page *page) |
1955 | +{ |
1956 | + return 1; |
1957 | +} |
1958 | + |
1959 | #endif /* _X8664_CACHEFLUSH_H */ |
1960 | diff --git a/include/asm-x86_64/suspend.h b/include/asm-x86_64/suspend.h |
1961 | index bc7f817..2f18e1b 100644 |
1962 | --- a/include/asm-x86_64/suspend.h |
1963 | +++ b/include/asm-x86_64/suspend.h |
1964 | @@ -12,6 +12,9 @@ arch_prepare_suspend(void) |
1965 | return 0; |
1966 | } |
1967 | |
1968 | +#define suspend2_faulted (0) |
1969 | +#define clear_suspend2_fault() do { } while(0) |
1970 | + |
1971 | /* Image of the saved processor state. If you touch this, fix acpi_wakeup.S. */ |
1972 | struct saved_context { |
1973 | u16 ds, es, fs, gs, ss; |
1974 | diff --git a/include/linux/device.h b/include/linux/device.h |
1975 | index 5cf30e9..69122c1 100644 |
1976 | --- a/include/linux/device.h |
1977 | +++ b/include/linux/device.h |
1978 | @@ -402,6 +402,7 @@ struct device { |
1979 | char bus_id[BUS_ID_SIZE]; /* position on parent bus */ |
1980 | struct device_type *type; |
1981 | unsigned is_registered:1; |
1982 | + unsigned pm_safe:1; /* No resume fn is ok? */ |
1983 | struct device_attribute uevent_attr; |
1984 | struct device_attribute *devt_attr; |
1985 | |
1986 | diff --git a/include/linux/dyn_pageflags.h b/include/linux/dyn_pageflags.h |
1987 | new file mode 100644 |
1988 | index 0000000..23d9127 |
1989 | --- /dev/null |
1990 | +++ b/include/linux/dyn_pageflags.h |
1991 | @@ -0,0 +1,68 @@ |
1992 | +/* |
1993 | + * include/linux/dyn_pageflags.h |
1994 | + * |
1995 | + * Copyright (C) 2004-2006 Nigel Cunningham <nigel@suspend2.net> |
1996 | + * |
1997 | + * This file is released under the GPLv2. |
1998 | + * |
1999 | + * It implements support for dynamically allocated bitmaps that are |
2000 | + * used for temporary or infrequently used pageflags, in lieu of |
2001 | + * bits in the struct page flags entry. |
2002 | + */ |
2003 | + |
2004 | +#ifndef DYN_PAGEFLAGS_H |
2005 | +#define DYN_PAGEFLAGS_H |
2006 | + |
2007 | +#include <linux/mm.h> |
2008 | + |
2009 | +/* [pg_dat][zone][page_num] */ |
2010 | +typedef unsigned long **** dyn_pageflags_t; |
2011 | + |
2012 | +#if BITS_PER_LONG == 32 |
2013 | +#define UL_SHIFT 5 |
2014 | +#else |
2015 | +#if BITS_PER_LONG == 64 |
2016 | +#define UL_SHIFT 6 |
2017 | +#else |
2018 | +#error Bits per long not 32 or 64? |
2019 | +#endif |
2020 | +#endif |
2021 | + |
2022 | +#define BIT_NUM_MASK (sizeof(unsigned long) * 8 - 1) |
2023 | +#define PAGE_NUM_MASK (~((1 << (PAGE_SHIFT + 3)) - 1)) |
2024 | +#define UL_NUM_MASK (~(BIT_NUM_MASK | PAGE_NUM_MASK)) |
2025 | + |
2026 | +/* |
2027 | + * PAGENUMBER gives the index of the page within the zone. |
2028 | + * PAGEINDEX gives the index of the unsigned long within that page. |
2029 | + * PAGEBIT gives the index of the bit within the unsigned long. |
2030 | + */ |
2031 | +#define BITS_PER_PAGE (PAGE_SIZE << 3) |
2032 | +#define PAGENUMBER(zone_offset) ((int) (zone_offset >> (PAGE_SHIFT + 3))) |
2033 | +#define PAGEINDEX(zone_offset) ((int) ((zone_offset & UL_NUM_MASK) >> UL_SHIFT)) |
2034 | +#define PAGEBIT(zone_offset) ((int) (zone_offset & BIT_NUM_MASK)) |
2035 | + |
2036 | +#define PAGE_UL_PTR(bitmap, node, zone_num, zone_pfn) \ |
2037 | + ((bitmap[node][zone_num][PAGENUMBER(zone_pfn)])+PAGEINDEX(zone_pfn)) |
2038 | + |
2039 | +#define BITMAP_FOR_EACH_SET(bitmap, counter) \ |
2040 | + for (counter = get_next_bit_on(bitmap, max_pfn + 1); counter <= max_pfn; \ |
2041 | + counter = get_next_bit_on(bitmap, counter)) |
2042 | + |
2043 | +extern void clear_dyn_pageflags(dyn_pageflags_t pagemap); |
2044 | +extern int allocate_dyn_pageflags(dyn_pageflags_t *pagemap); |
2045 | +extern void free_dyn_pageflags(dyn_pageflags_t *pagemap); |
2046 | +extern unsigned long get_next_bit_on(dyn_pageflags_t bitmap, unsigned long counter); |
2047 | + |
2048 | +extern int test_dynpageflag(dyn_pageflags_t *bitmap, struct page *page); |
2049 | +extern void set_dynpageflag(dyn_pageflags_t *bitmap, struct page *page); |
2050 | +extern void clear_dynpageflag(dyn_pageflags_t *bitmap, struct page *page); |
2051 | +#endif |
2052 | + |
2053 | +/* |
2054 | + * With the above macros defined, you can do... |
2055 | + * #define PagePageset1(page) (test_dynpageflag(&pageset1_map, page)) |
2056 | + * #define SetPagePageset1(page) (set_dynpageflag(&pageset1_map, page)) |
2057 | + * #define ClearPagePageset1(page) (clear_dynpageflag(&pageset1_map, page)) |
2058 | + */ |
2059 | + |
2060 | diff --git a/include/linux/freezer.h b/include/linux/freezer.h |
2061 | index 5e75e26..f49c9be 100644 |
2062 | --- a/include/linux/freezer.h |
2063 | +++ b/include/linux/freezer.h |
2064 | @@ -1,7 +1,10 @@ |
2065 | -/* Freezer declarations */ |
2066 | +#ifndef LINUX_FREEZER_H |
2067 | +#define LINUX_FREEZER_H |
2068 | |
2069 | #include <linux/sched.h> |
2070 | |
2071 | +/* Freezer declarations */ |
2072 | + |
2073 | #ifdef CONFIG_PM |
2074 | /* |
2075 | * Check if a process has been frozen |
2076 | @@ -73,6 +76,18 @@ static inline int try_to_freeze(void) |
2077 | |
2078 | extern void thaw_some_processes(int all); |
2079 | |
2080 | +extern int freezer_state; |
2081 | +#define FREEZER_OFF 0 |
2082 | +#define FREEZER_USERSPACE_FROZEN 1 |
2083 | +#define FREEZER_FULLY_ON 2 |
2084 | + |
2085 | +static inline int freezer_is_on(void) |
2086 | +{ |
2087 | + return (freezer_state == FREEZER_FULLY_ON); |
2088 | +} |
2089 | + |
2090 | +extern void thaw_kernel_threads(void); |
2091 | + |
2092 | #else |
2093 | static inline int frozen(struct task_struct *p) { return 0; } |
2094 | static inline int freezing(struct task_struct *p) { return 0; } |
2095 | @@ -85,6 +100,9 @@ static inline int freeze_processes(void) { BUG(); return 0; } |
2096 | static inline void thaw_processes(void) {} |
2097 | |
2098 | static inline int try_to_freeze(void) { return 0; } |
2099 | +static inline int freezer_is_on(void) { return 0; } |
2100 | +static inline void thaw_kernel_threads(void) { } |
2101 | |
2102 | |
2103 | #endif |
2104 | +#endif |
2105 | diff --git a/include/linux/kernel.h b/include/linux/kernel.h |
2106 | index 9ddf25c..c18ec95 100644 |
2107 | --- a/include/linux/kernel.h |
2108 | +++ b/include/linux/kernel.h |
2109 | @@ -113,6 +113,8 @@ extern int vsprintf(char *buf, const char *, va_list) |
2110 | __attribute__ ((format (printf, 2, 0))); |
2111 | extern int snprintf(char * buf, size_t size, const char * fmt, ...) |
2112 | __attribute__ ((format (printf, 3, 4))); |
2113 | +extern int snprintf_used(char *buffer, int buffer_size, |
2114 | + const char *fmt, ...); |
2115 | extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
2116 | __attribute__ ((format (printf, 3, 0))); |
2117 | extern int scnprintf(char * buf, size_t size, const char * fmt, ...) |
2118 | diff --git a/include/linux/netlink.h b/include/linux/netlink.h |
2119 | index 2a20f48..b4d9db1 100644 |
2120 | --- a/include/linux/netlink.h |
2121 | +++ b/include/linux/netlink.h |
2122 | @@ -24,6 +24,8 @@ |
2123 | /* leave room for NETLINK_DM (DM Events) */ |
2124 | #define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */ |
2125 | #define NETLINK_ECRYPTFS 19 |
2126 | +#define NETLINK_SUSPEND2_USERUI 20 /* For suspend2's userui */ |
2127 | +#define NETLINK_SUSPEND2_USM 21 /* For suspend2's userspace storage manager */ |
2128 | |
2129 | #define MAX_LINKS 32 |
2130 | |
2131 | diff --git a/include/linux/suspend.h b/include/linux/suspend.h |
2132 | index bf99bd4..02c1184 100644 |
2133 | --- a/include/linux/suspend.h |
2134 | +++ b/include/linux/suspend.h |
2135 | @@ -27,14 +27,9 @@ extern void mark_free_pages(struct zone *zone); |
2136 | /* kernel/power/swsusp.c */ |
2137 | extern int software_suspend(void); |
2138 | |
2139 | -#if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) |
2140 | extern int pm_prepare_console(void); |
2141 | extern void pm_restore_console(void); |
2142 | #else |
2143 | -static inline int pm_prepare_console(void) { return 0; } |
2144 | -static inline void pm_restore_console(void) {} |
2145 | -#endif /* defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) */ |
2146 | -#else |
2147 | static inline int software_suspend(void) |
2148 | { |
2149 | printk("Warning: fake suspend called\n"); |
2150 | @@ -45,8 +40,6 @@ static inline int software_suspend(void) |
2151 | void save_processor_state(void); |
2152 | void restore_processor_state(void); |
2153 | struct saved_context; |
2154 | -void __save_processor_state(struct saved_context *ctxt); |
2155 | -void __restore_processor_state(struct saved_context *ctxt); |
2156 | unsigned long get_safe_page(gfp_t gfp_mask); |
2157 | |
2158 | /* |
2159 | @@ -55,4 +48,81 @@ unsigned long get_safe_page(gfp_t gfp_mask); |
2160 | */ |
2161 | #define PAGES_FOR_IO 1024 |
2162 | |
2163 | +enum { |
2164 | + SUSPEND_CAN_SUSPEND, |
2165 | + SUSPEND_CAN_RESUME, |
2166 | + SUSPEND_RUNNING, |
2167 | + SUSPEND_RESUME_DEVICE_OK, |
2168 | + SUSPEND_NORESUME_SPECIFIED, |
2169 | + SUSPEND_SANITY_CHECK_PROMPT, |
2170 | + SUSPEND_PAGESET2_NOT_LOADED, |
2171 | + SUSPEND_CONTINUE_REQ, |
2172 | + SUSPEND_RESUMED_BEFORE, |
2173 | + SUSPEND_RESUME_NOT_DONE, |
2174 | + SUSPEND_BOOT_TIME, |
2175 | + SUSPEND_NOW_RESUMING, |
2176 | + SUSPEND_IGNORE_LOGLEVEL, |
2177 | + SUSPEND_TRYING_TO_RESUME, |
2178 | + SUSPEND_TRY_RESUME_RD, |
2179 | + SUSPEND_LOADING_ALT_IMAGE, |
2180 | + SUSPEND_STOP_RESUME, |
2181 | + SUSPEND_IO_STOPPED, |
2182 | +}; |
2183 | + |
2184 | +#ifdef CONFIG_SUSPEND2 |
2185 | + |
2186 | +/* Used in init dir files */ |
2187 | +extern unsigned long suspend_state; |
2188 | +#define set_suspend_state(bit) (set_bit(bit, &suspend_state)) |
2189 | +#define clear_suspend_state(bit) (clear_bit(bit, &suspend_state)) |
2190 | +#define test_suspend_state(bit) (test_bit(bit, &suspend_state)) |
2191 | +extern int suspend2_running; |
2192 | + |
2193 | +#else /* !CONFIG_SUSPEND2 */ |
2194 | + |
2195 | +#define suspend_state (0) |
2196 | +#define set_suspend_state(bit) do { } while(0) |
2197 | +#define clear_suspend_state(bit) do { } while (0) |
2198 | +#define test_suspend_state(bit) (0) |
2199 | +#define suspend2_running (0) |
2200 | +#endif /* CONFIG_SUSPEND2 */ |
2201 | + |
2202 | +#ifdef CONFIG_SUSPEND_SHARED |
2203 | +#ifdef CONFIG_SUSPEND2 |
2204 | +extern void suspend2_try_resume(void); |
2205 | +#else |
2206 | +#define suspend2_try_resume() do { } while(0) |
2207 | +#endif |
2208 | + |
2209 | +extern int resume_attempted; |
2210 | + |
2211 | +#ifdef CONFIG_SOFTWARE_SUSPEND |
2212 | +extern int software_resume(void); |
2213 | +#else |
2214 | +static inline int software_resume(void) |
2215 | +{ |
2216 | + resume_attempted = 1; |
2217 | + suspend2_try_resume(); |
2218 | + return 0; |
2219 | +} |
2220 | +#endif |
2221 | + |
2222 | +static inline void check_resume_attempted(void) |
2223 | +{ |
2224 | + if (resume_attempted) |
2225 | + return; |
2226 | + |
2227 | + software_resume(); |
2228 | +} |
2229 | +#else |
2230 | +#define check_resume_attempted() do { } while(0) |
2231 | +#define resume_attempted (0) |
2232 | +#endif |
2233 | + |
2234 | +#ifdef CONFIG_PRINTK_NOSAVE |
2235 | +#define POSS_NOSAVE __nosavedata |
2236 | +#else |
2237 | +#define POSS_NOSAVE |
2238 | +#endif |
2239 | + |
2240 | #endif /* _LINUX_SWSUSP_H */ |
2241 | diff --git a/include/linux/swap.h b/include/linux/swap.h |
2242 | index 0068688..ad3fead 100644 |
2243 | --- a/include/linux/swap.h |
2244 | +++ b/include/linux/swap.h |
2245 | @@ -190,8 +190,9 @@ extern void swap_setup(void); |
2246 | /* linux/mm/vmscan.c */ |
2247 | extern unsigned long try_to_free_pages(struct zone **, gfp_t, |
2248 | struct task_struct *p); |
2249 | extern unsigned long shrink_all_memory(unsigned long nr_pages); |
2250 | +extern void shrink_one_zone(struct zone *zone, int desired_size); |
2251 | extern int vm_mapped; |
2252 | extern int vm_hardmaplimit; |
2253 | extern int remove_mapping(struct address_space *mapping, struct page *page); |
2254 | extern long vm_total_pages; |
2255 | @@ -368,5 +369,10 @@ static inline swp_entry_t get_swap_page(void) |
2256 | #define disable_swap_token() do { } while(0) |
2257 | |
2258 | #endif /* CONFIG_SWAP */ |
2259 | + |
2260 | +/* For Suspend2 - unlink LRU pages while saving separately */ |
2261 | +void unlink_lru_lists(void); |
2262 | +void relink_lru_lists(void); |
2263 | + |
2264 | #endif /* __KERNEL__*/ |
2265 | #endif /* _LINUX_SWAP_H */ |
2266 | diff --git a/include/linux/time.h b/include/linux/time.h |
2267 | index 8ea8dea..5c07f00 100644 |
2268 | --- a/include/linux/time.h |
2269 | +++ b/include/linux/time.h |
2270 | @@ -224,4 +224,7 @@ struct itimerval { |
2271 | */ |
2272 | #define TIMER_ABSTIME 0x01 |
2273 | |
2274 | +extern void save_avenrun(void); |
2275 | +extern void restore_avenrun(void); |
2276 | + |
2277 | #endif |
2278 | diff --git a/init/do_mounts.c b/init/do_mounts.c |
2279 | index dc1ec08..3e67387 100644 |
2280 | --- a/init/do_mounts.c |
2281 | +++ b/init/do_mounts.c |
2282 | @@ -139,11 +139,16 @@ dev_t name_to_dev_t(char *name) |
2283 | char s[32]; |
2284 | char *p; |
2285 | dev_t res = 0; |
2286 | - int part; |
2287 | + int part, mount_result; |
2288 | |
2289 | #ifdef CONFIG_SYSFS |
2290 | int mkdir_err = sys_mkdir("/sys", 0700); |
2291 | - if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0) |
2292 | + /* |
2293 | + * When changing resume2 parameter for Software Suspend, sysfs may |
2294 | + * already be mounted. |
2295 | + */ |
2296 | + mount_result = sys_mount("sysfs", "/sys", "sysfs", 0, NULL); |
2297 | + if (mount_result < 0 && mount_result != -EBUSY) |
2298 | goto out; |
2299 | #endif |
2300 | |
2301 | @@ -195,7 +200,8 @@ dev_t name_to_dev_t(char *name) |
2302 | res = try_name(s, part); |
2303 | done: |
2304 | #ifdef CONFIG_SYSFS |
2305 | - sys_umount("/sys", 0); |
2306 | + if (mount_result >= 0) |
2307 | + sys_umount("/sys", 0); |
2308 | out: |
2309 | if (!mkdir_err) |
2310 | sys_rmdir("/sys"); |
2311 | @@ -434,12 +440,27 @@ void __init prepare_namespace(void) |
2312 | |
2313 | is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; |
2314 | |
2315 | + /* Suspend2: |
2316 | + * By this point, suspend_early_init has been called to initialise our |
2317 | + * sysfs interface. If modules are built in, they have registered (all |
2318 | + * of the above via initcalls). |
2319 | + * |
2320 | + * We have not yet looked to see if an image exists, however. If we |
2321 | + * have an initrd, it is expected that the user will have set it up |
2322 | + * to echo > /sys/power/suspend2/do_resume and thus initiate any |
2323 | + * resume. If they don't do that, we do it immediately after the initrd |
2324 | + * is finished (major issues if they mount filesystems rw from the |
2325 | + * initrd! - they are warned. If there's no usable initrd, we do our |
2326 | + * check next. |
2327 | + */ |
2328 | if (initrd_load()) |
2329 | goto out; |
2330 | |
2331 | if (is_floppy && rd_doload && rd_load_disk(0)) |
2332 | ROOT_DEV = Root_RAM0; |
2333 | |
2334 | + check_resume_attempted(); |
2335 | + |
2336 | mount_root(); |
2337 | out: |
2338 | sys_mount(".", "/", NULL, MS_MOVE, NULL); |
2339 | diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c |
2340 | index 2cfd7cb..9c24ec4 100644 |
2341 | --- a/init/do_mounts_initrd.c |
2342 | +++ b/init/do_mounts_initrd.c |
2343 | @@ -6,6 +6,7 @@ |
2344 | #include <linux/romfs_fs.h> |
2345 | #include <linux/initrd.h> |
2346 | #include <linux/sched.h> |
2347 | +#include <linux/suspend.h> |
2348 | #include <linux/freezer.h> |
2349 | |
2350 | #include "do_mounts.h" |
2351 | @@ -58,10 +59,18 @@ static void __init handle_initrd(void) |
2352 | current->flags |= PF_NOFREEZE; |
2353 | pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD); |
2354 | if (pid > 0) { |
2355 | - while (pid != sys_wait4(-1, NULL, 0, NULL)) |
2356 | + while (pid != sys_wait4(-1, NULL, 0, NULL)) { |
2357 | yield(); |
2358 | + try_to_freeze(); |
2359 | + } |
2360 | } |
2361 | |
2362 | + if (!resume_attempted) |
2363 | + printk(KERN_ERR "Suspend2: No attempt was made to resume from " |
2364 | + "any image that might exist.\n"); |
2365 | + clear_suspend_state(SUSPEND_BOOT_TIME); |
2366 | + current->flags &= ~PF_NOFREEZE; |
2367 | + |
2368 | /* move initrd to rootfs' /old */ |
2369 | sys_fchdir(old_fd); |
2370 | sys_mount("/", ".", NULL, MS_MOVE, NULL); |
2371 | diff --git a/init/main.c b/init/main.c |
2372 | index a92989e..cd3f60f 100644 |
2373 | --- a/init/main.c |
2374 | +++ b/init/main.c |
2375 | @@ -54,6 +54,7 @@ |
2376 | #include <linux/lockdep.h> |
2377 | #include <linux/pid_namespace.h> |
2378 | #include <linux/device.h> |
2379 | +#include <linux/suspend.h> |
2380 | |
2381 | #include <asm/io.h> |
2382 | #include <asm/bugs.h> |
2383 | @@ -804,7 +805,9 @@ static int __init init(void * unused) |
2384 | |
2385 | /* |
2386 | * check if there is an early userspace init. If yes, let it do all |
2387 | - * the work |
2388 | + * the work. For suspend2, we assume that it will do the right thing |
2389 | + * with regard to trying to resume at the right place. When that |
2390 | + * happens, the BOOT_TIME flag will be cleared. |
2391 | */ |
2392 | |
2393 | if (!ramdisk_execute_command) |
2394 | diff --git a/kernel/kmod.c b/kernel/kmod.c |
2395 | index 7962761..f0d6fc1 100644 |
2396 | --- a/kernel/kmod.c |
2397 | +++ b/kernel/kmod.c |
2398 | @@ -34,6 +34,7 @@ |
2399 | #include <linux/kernel.h> |
2400 | #include <linux/init.h> |
2401 | #include <linux/resource.h> |
2402 | +#include <linux/freezer.h> |
2403 | #include <asm/uaccess.h> |
2404 | |
2405 | extern int max_threads; |
2406 | @@ -338,6 +339,11 @@ int call_usermodehelper_pipe(char *path, char **argv, char **envp, |
2407 | } |
2408 | sub_info.stdin = f; |
2409 | |
2410 | + if (freezer_is_on()) { |
2411 | + printk(KERN_WARNING "Freezer is on. Refusing to start %s.\n", path); |
2412 | + return -EBUSY; |
2413 | + } |
2414 | + |
2415 | queue_work(khelper_wq, &sub_info.work); |
2416 | wait_for_completion(&done); |
2417 | return sub_info.retval; |
2418 | diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig |
2419 | index 51a4dd0..4caac70 100644 |
2420 | --- a/kernel/power/Kconfig |
2421 | +++ b/kernel/power/Kconfig |
2422 | @@ -48,6 +48,18 @@ config DISABLE_CONSOLE_SUSPEND |
2423 | suspend/resume routines, but may itself lead to problems, for example |
2424 | if netconsole is used. |
2425 | |
2426 | +config PRINTK_NOSAVE |
2427 | + depends on PM && PM_DEBUG |
2428 | + bool "Preserve printk data from boot kernel when resuming." |
2429 | + default n |
2430 | + ---help--- |
2431 | + This option gives printk data and the associated variables the |
2432 | + attribute __nosave, which means that they will not be saved as |
2433 | + part of the image. The net effect is that after resuming, your |
2434 | + dmesg will show the messages from prior to the atomic restore, |
2435 | + instead of the messages from the resumed kernel. This may be |
2436 | + useful for debugging hibernation. |
2437 | + |
2438 | config PM_TRACE |
2439 | bool "Suspend/resume event tracing" |
2440 | depends on PM && PM_DEBUG && X86_32 && EXPERIMENTAL |
2441 | @@ -162,3 +174,174 @@ config APM_EMULATION |
2442 | random kernel OOPSes or reboots that don't seem to be related to |
2443 | anything, try disabling/enabling this option (or disabling/enabling |
2444 | APM in your BIOS). |
2445 | + |
2446 | +menuconfig SUSPEND2_CORE |
2447 | + tristate "Suspend2" |
2448 | + depends on PM |
2449 | + select DYN_PAGEFLAGS |
2450 | + select HOTPLUG_CPU if SMP |
2451 | + default y |
2452 | + ---help--- |
2453 | + Suspend2 is the 'new and improved' suspend support. |
2454 | + |
2455 | + See the Suspend2 home page (suspend2.net) |
2456 | + for FAQs, HOWTOs and other documentation. |
2457 | + |
2458 | + comment "Image Storage (you need at least one allocator)" |
2459 | + depends on SUSPEND2_CORE |
2460 | + |
2461 | + config SUSPEND2_FILE |
2462 | + tristate "File Allocator" |
2463 | + depends on SUSPEND2_CORE |
2464 | + default y |
2465 | + ---help--- |
2466 | + This option enables support for storing an image in a |
2467 | + simple file. This should be possible, but we're still |
2468 | + testing it. |
2469 | + |
2470 | + config SUSPEND2_SWAP |
2471 | + tristate "Swap Allocator" |
2472 | + depends on SUSPEND2_CORE |
2473 | + default y |
2474 | + select SWAP |
2475 | + ---help--- |
2476 | + This option enables support for storing an image in your |
2477 | + swap space. |
2478 | + |
2479 | + comment "General Options" |
2480 | + depends on SUSPEND2_CORE |
2481 | + |
2482 | + config SUSPEND2_CRYPTO |
2483 | + tristate "Compression support" |
2484 | + depends on SUSPEND2_CORE && CRYPTO |
2485 | + default y |
2486 | + ---help--- |
2487 | + This option adds support for using cryptoapi compression |
2488 | + algorithms. Compression is particularly useful as |
2489 | + the LZF support that comes with the Suspend2 patch can double |
2490 | + your suspend and resume speed. |
2491 | + |
2492 | + You probably want this, so say Y here. |
2493 | + |
2494 | + comment "No compression support available without Cryptoapi support." |
2495 | + depends on SUSPEND2_CORE && !CRYPTO |
2496 | + |
2497 | + config SUSPEND2_USERUI |
2498 | + tristate "Userspace User Interface support" |
2499 | + depends on SUSPEND2_CORE && NET |
2500 | + default y |
2501 | + ---help--- |
2502 | + This option enabled support for a userspace based user interface |
2503 | + to Suspend2, which allows you to have a nice display while suspending |
2504 | + and resuming, and also enables features such as pressing escape to |
2505 | + cancel a cycle or interactive debugging. |
2506 | + |
2507 | + config SUSPEND2_DEFAULT_RESUME2 |
2508 | + string "Default resume device name" |
2509 | + depends on SUSPEND2_CORE |
2510 | + ---help--- |
2511 | + You normally need to add a resume2= parameter to your lilo.conf or |
2512 | + equivalent. With this option properly set, the kernel has a value |
2513 | + to default. No damage will be done if the value is invalid. |
2514 | + |
2515 | + config SUSPEND2_KEEP_IMAGE |
2516 | + bool "Allow Keep Image Mode" |
2517 | + depends on SUSPEND2_CORE |
2518 | + ---help--- |
2519 | + This option allows you to keep and image and reuse it. It is intended |
2520 | + __ONLY__ for use with systems where all filesystems are mounted read- |
2521 | + only (kiosks, for example). To use it, compile this option in and boot |
2522 | + normally. Set the KEEP_IMAGE flag in /sys/power/suspend2 and suspend. |
2523 | + When you resume, the image will not be removed. You will be unable to turn |
2524 | + off swap partitions (assuming you are using the swap allocator), but future |
2525 | + suspends simply do a power-down. The image can be updated using the |
2526 | + kernel command line parameter suspend_act= to turn off the keep image |
2527 | + bit. Keep image mode is a little less user friendly on purpose - it |
2528 | + should not be used without thought! |
2529 | + |
2530 | + config SUSPEND2_REPLACE_SWSUSP |
2531 | + bool "Replace swsusp by default" |
2532 | + default y |
2533 | + depends on SUSPEND2_CORE |
2534 | + ---help--- |
2535 | + Suspend2 can replace swsusp. This option makes that the default state, |
2536 | + requiring you to echo 0 > /sys/power/suspend2/replace_swsusp if you want |
2537 | + to use the vanilla kernel functionality. Note that your initrd/ramfs will |
2538 | + need to do this before trying to resume, too. |
2539 | + With overriding swsusp enabled, Suspend2 will use both the resume= and |
2540 | + noresume commandline options _and_ the resume2= and noresume2 ones (for |
2541 | + compatibility). resume= takes precedence over resume2=. Echoing disk |
2542 | + to /sys/power/state will start a Suspend2 cycle. If resume= doesn't |
2543 | + specify an allocator and both the swap and file allocators are compiled in, |
2544 | + the swap allocator will be used by default. |
2545 | + |
2546 | + config SUSPEND2_CLUSTER |
2547 | + tristate "Cluster support" |
2548 | + default n |
2549 | + depends on SUSPEND2_CORE && NET && BROKEN |
2550 | + ---help--- |
2551 | + Support for linking multiple machines in a cluster so that they suspend |
2552 | + and resume together. |
2553 | + |
2554 | + config SUSPEND2_DEFAULT_CLUSTER_MASTER |
2555 | + string "Default cluster master address/port" |
2556 | + depends on SUSPEND2_CLUSTER |
2557 | + ---help--- |
2558 | + If this machine will be the master, simply enter a port on which to |
2559 | + listen for slaves. |
2560 | + If this machine will be a slave, enter the ip address and port on |
2561 | + which the master listens with a colon separating them. |
2562 | + If no value is set here, cluster support will be disabled by default. |
2563 | + |
2564 | + config SUSPEND2_CHECKSUM |
2565 | + bool "Checksum pageset2" |
2566 | + depends on SUSPEND2_CORE |
2567 | + select CRYPTO |
2568 | + select CRYPTO_ALGAPI |
2569 | + select CRYPTO_MD5 |
2570 | + ---help--- |
2571 | + Adds support for checksumming pageset2 pages, to ensure you really get an |
2572 | + atomic copy. Should not normally be needed, but here for verification and |
2573 | + diagnostic purposes. |
2574 | + |
2575 | +config SUSPEND_SHARED |
2576 | + bool |
2577 | + depends on SUSPEND2_CORE || SOFTWARE_SUSPEND |
2578 | + default y |
2579 | + |
2580 | +config SUSPEND2_USERUI_EXPORTS |
2581 | + bool |
2582 | + depends on SUSPEND2_USERUI=m |
2583 | + default y |
2584 | + |
2585 | +config SUSPEND2_SWAP_EXPORTS |
2586 | + bool |
2587 | + depends on SUSPEND2_SWAP=m |
2588 | + default y |
2589 | + |
2590 | +config SUSPEND2_FILE_EXPORTS |
2591 | + bool |
2592 | + depends on SUSPEND2_FILE=m |
2593 | + default y |
2594 | + |
2595 | +config SUSPEND2_CRYPTO_EXPORTS |
2596 | + bool |
2597 | + depends on SUSPEND2_CRYPTO=m |
2598 | + default y |
2599 | + |
2600 | +config SUSPEND2_CORE_EXPORTS |
2601 | + bool |
2602 | + depends on SUSPEND2_CORE=m |
2603 | + default y |
2604 | + |
2605 | +config SUSPEND2_EXPORTS |
2606 | + bool |
2607 | + depends on SUSPEND2_SWAP_EXPORTS || SUSPEND2_FILE_EXPORTS || \ |
2608 | + SUSPEND2_CRYPTO_EXPORTS || SUSPEND2_CLUSTER=m || \ |
2609 | + SUSPEND2_USERUI_EXPORTS |
2610 | + default y |
2611 | + |
2612 | +config SUSPEND2 |
2613 | + bool |
2614 | + depends on SUSPEND2_CORE!=n |
2615 | + default y |
2616 | diff --git a/kernel/power/Makefile b/kernel/power/Makefile |
2617 | index 38725f5..a4a8c5b 100644 |
2618 | --- a/kernel/power/Makefile |
2619 | +++ b/kernel/power/Makefile |
2620 | @@ -5,6 +5,32 @@ endif |
2621 | |
2622 | obj-y := main.o process.o console.o |
2623 | obj-$(CONFIG_PM_LEGACY) += pm.o |
2624 | -obj-$(CONFIG_SOFTWARE_SUSPEND) += swsusp.o disk.o snapshot.o swap.o user.o |
2625 | +obj-$(CONFIG_SUSPEND_SHARED) += snapshot.o |
2626 | + |
2627 | +suspend_core-objs := modules.o sysfs.o suspend.o \ |
2628 | + io.o pagedir.o prepare_image.o \ |
2629 | + extent.o pageflags.o ui.o \ |
2630 | + power_off.o atomic_copy.o |
2631 | + |
2632 | +obj-$(CONFIG_SUSPEND2) += suspend2_builtin.o |
2633 | + |
2634 | +ifdef CONFIG_SUSPEND2_CHECKSUM |
2635 | +suspend_core-objs += checksum.o |
2636 | +endif |
2637 | + |
2638 | +ifdef CONFIG_NET |
2639 | +suspend_core-objs += storage.o netlink.o |
2640 | +endif |
2641 | + |
2642 | +obj-$(CONFIG_SUSPEND2_CORE) += suspend_core.o |
2643 | +obj-$(CONFIG_SUSPEND2_CRYPTO) += suspend_compress.o |
2644 | + |
2645 | +obj-$(CONFIG_SUSPEND2_SWAP) += suspend_block_io.o suspend_swap.o |
2646 | +obj-$(CONFIG_SUSPEND2_FILE) += suspend_block_io.o suspend_file.o |
2647 | +obj-$(CONFIG_SUSPEND2_CLUSTER) += cluster.o |
2648 | + |
2649 | +obj-$(CONFIG_SUSPEND2_USERUI) += suspend_userui.o |
2650 | + |
2651 | +obj-$(CONFIG_SOFTWARE_SUSPEND) += swsusp.o disk.o swap.o user.o |
2652 | |
2653 | obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o |
2654 | diff --git a/kernel/power/atomic_copy.c b/kernel/power/atomic_copy.c |
2655 | new file mode 100644 |
2656 | index 0000000..d2b8cd7 |
2657 | --- /dev/null |
2658 | +++ b/kernel/power/atomic_copy.c |
2659 | @@ -0,0 +1,416 @@ |
2660 | +/* |
2661 | + * kernel/power/atomic_copy.c |
2662 | + * |
2663 | + * Copyright 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
2664 | + * Copyright (C) 2006 Red Hat, inc. |
2665 | + * |
2666 | + * Distributed under GPLv2. |
2667 | + * |
2668 | + * Routines for doing the atomic save/restore. |
2669 | + */ |
2670 | + |
2671 | +#include <linux/suspend.h> |
2672 | +#include <linux/highmem.h> |
2673 | +#include <linux/cpu.h> |
2674 | +#include <linux/freezer.h> |
2675 | +#include <linux/console.h> |
2676 | +#include "suspend.h" |
2677 | +#include "storage.h" |
2678 | +#include "power_off.h" |
2679 | +#include "ui.h" |
2680 | +#include "power.h" |
2681 | +#include "io.h" |
2682 | +#include "prepare_image.h" |
2683 | +#include "pageflags.h" |
2684 | +#include "checksum.h" |
2685 | +#include "suspend2_builtin.h" |
2686 | + |
2687 | +int extra_pd1_pages_used; |
2688 | + |
2689 | +/* |
2690 | + * Highmem related functions (x86 only). |
2691 | + */ |
2692 | + |
2693 | +#ifdef CONFIG_HIGHMEM |
2694 | + |
2695 | +/** |
2696 | + * copyback_high: Restore highmem pages. |
2697 | + * |
2698 | + * Highmem data and pbe lists are/can be stored in highmem. |
2699 | + * The format is slightly different to the lowmem pbe lists |
2700 | + * used for the assembly code: the last pbe in each page is |
2701 | + * a struct page * instead of struct pbe *, pointing to the |
2702 | + * next page where pbes are stored (or NULL if happens to be |
2703 | + * the end of the list). Since we don't want to generate |
2704 | + * unnecessary deltas against swsusp code, we use a cast |
2705 | + * instead of a union. |
2706 | + **/ |
2707 | + |
2708 | +static void copyback_high(void) |
2709 | +{ |
2710 | + struct page * pbe_page = (struct page *) restore_highmem_pblist; |
2711 | + struct pbe *this_pbe, *first_pbe; |
2712 | + unsigned long *origpage, *copypage; |
2713 | + int pbe_index = 1; |
2714 | + |
2715 | + if (!pbe_page) |
2716 | + return; |
2717 | + |
2718 | + this_pbe = (struct pbe *) kmap_atomic(pbe_page, KM_BOUNCE_READ); |
2719 | + first_pbe = this_pbe; |
2720 | + |
2721 | + while (this_pbe) { |
2722 | + int loop = (PAGE_SIZE / sizeof(unsigned long)) - 1; |
2723 | + |
2724 | + origpage = kmap_atomic((struct page *) this_pbe->orig_address, |
2725 | + KM_BIO_DST_IRQ); |
2726 | + copypage = kmap_atomic((struct page *) this_pbe->address, |
2727 | + KM_BIO_SRC_IRQ); |
2728 | + |
2729 | + while (loop >= 0) { |
2730 | + *(origpage + loop) = *(copypage + loop); |
2731 | + loop--; |
2732 | + } |
2733 | + |
2734 | + kunmap_atomic(origpage, KM_BIO_DST_IRQ); |
2735 | + kunmap_atomic(copypage, KM_BIO_SRC_IRQ); |
2736 | + |
2737 | + if (!this_pbe->next) |
2738 | + break; |
2739 | + |
2740 | + if (pbe_index < PBES_PER_PAGE) { |
2741 | + this_pbe++; |
2742 | + pbe_index++; |
2743 | + } else { |
2744 | + pbe_page = (struct page *) this_pbe->next; |
2745 | + kunmap_atomic(first_pbe, KM_BOUNCE_READ); |
2746 | + if (!pbe_page) |
2747 | + return; |
2748 | + this_pbe = (struct pbe *) kmap_atomic(pbe_page, |
2749 | + KM_BOUNCE_READ); |
2750 | + first_pbe = this_pbe; |
2751 | + pbe_index = 1; |
2752 | + } |
2753 | + } |
2754 | + kunmap_atomic(first_pbe, KM_BOUNCE_READ); |
2755 | +} |
2756 | + |
2757 | +#else /* CONFIG_HIGHMEM */ |
2758 | +void copyback_high(void) { } |
2759 | +#endif |
2760 | + |
2761 | +/** |
2762 | + * free_pbe_list: Free page backup entries used by the atomic copy code. |
2763 | + * |
2764 | + * Normally, this function isn't used. If, however, we need to abort before |
2765 | + * doing the atomic copy, we use this to free the pbes previously allocated. |
2766 | + **/ |
2767 | +static void free_pbe_list(struct pbe **list, int highmem) |
2768 | +{ |
2769 | + struct pbe *free_pbe = *list; |
2770 | + struct page *page = (struct page *) free_pbe; |
2771 | + |
2772 | + do { |
2773 | + int i; |
2774 | + |
2775 | + if (highmem) |
2776 | + free_pbe = (struct pbe *) kmap(page); |
2777 | + |
2778 | + for (i = 0; i < PBES_PER_PAGE; i++) { |
2779 | + if (!free_pbe) |
2780 | + break; |
2781 | + __free_page(free_pbe->address); |
2782 | + free_pbe = free_pbe->next; |
2783 | + } |
2784 | + |
2785 | + if (highmem) { |
2786 | + struct page *next_page = NULL; |
2787 | + if (free_pbe) |
2788 | + next_page = (struct page *) free_pbe->next; |
2789 | + kunmap(page); |
2790 | + __free_page(page); |
2791 | + page = next_page; |
2792 | + } |
2793 | + |
2794 | + } while(page && free_pbe); |
2795 | + |
2796 | + *list = NULL; |
2797 | +} |
2798 | + |
2799 | +/** |
2800 | + * copyback_post: Post atomic-restore actions. |
2801 | + * |
2802 | + * After doing the atomic restore, we have a few more things to do: |
2803 | + * 1) We want to retain some values across the restore, so we now copy |
2804 | + * these from the nosave variables to the normal ones. |
2805 | + * 2) Set the status flags. |
2806 | + * 3) Resume devices. |
2807 | + * 4) Get userui to redraw. |
2808 | + * 5) Reread the page cache. |
2809 | + **/ |
2810 | + |
2811 | +void copyback_post(void) |
2812 | +{ |
2813 | + int loop; |
2814 | + |
2815 | + suspend_action = suspend2_nosave_state1; |
2816 | + suspend_debug_state = suspend2_nosave_state2; |
2817 | + console_loglevel = suspend2_nosave_state3; |
2818 | + |
2819 | + for (loop = 0; loop < 4; loop++) |
2820 | + suspend_io_time[loop/2][loop%2] = |
2821 | + suspend2_nosave_io_speed[loop/2][loop%2]; |
2822 | + |
2823 | + set_suspend_state(SUSPEND_NOW_RESUMING); |
2824 | + set_suspend_state(SUSPEND_PAGESET2_NOT_LOADED); |
2825 | + |
2826 | + if (suspend_activate_storage(1)) |
2827 | + panic("Failed to reactivate our storage."); |
2828 | + |
2829 | + suspend_ui_redraw(); |
2830 | + |
2831 | + suspend_cond_pause(1, "About to reload secondary pagedir."); |
2832 | + |
2833 | + if (read_pageset2(0)) |
2834 | + panic("Unable to successfully reread the page cache."); |
2835 | + |
2836 | + clear_suspend_state(SUSPEND_PAGESET2_NOT_LOADED); |
2837 | +} |
2838 | + |
2839 | +/** |
2840 | + * suspend_copy_pageset1: Do the atomic copy of pageset1. |
2841 | + * |
2842 | + * Make the atomic copy of pageset1. We can't use copy_page (as we once did) |
2843 | + * because we can't be sure what side effects it has. On my old Duron, with |
2844 | + * 3DNOW, kernel_fpu_begin increments preempt count, making our preempt |
2845 | + * count at resume time 4 instead of 3. |
2846 | + * |
2847 | + * We don't want to call kmap_atomic unconditionally because it has the side |
2848 | + * effect of incrementing the preempt count, which will leave it one too high |
2849 | + * post resume (the page containing the preempt count will be copied after |
2850 | + * its incremented. This is essentially the same problem. |
2851 | + **/ |
2852 | + |
2853 | +void suspend_copy_pageset1(void) |
2854 | +{ |
2855 | + int i; |
2856 | + unsigned long source_index, dest_index; |
2857 | + |
2858 | + source_index = get_next_bit_on(pageset1_map, max_pfn + 1); |
2859 | + dest_index = get_next_bit_on(pageset1_copy_map, max_pfn + 1); |
2860 | + |
2861 | + for (i = 0; i < pagedir1.size; i++) { |
2862 | + unsigned long *origvirt, *copyvirt; |
2863 | + struct page *origpage, *copypage; |
2864 | + int loop = (PAGE_SIZE / sizeof(unsigned long)) - 1; |
2865 | + |
2866 | + origpage = pfn_to_page(source_index); |
2867 | + copypage = pfn_to_page(dest_index); |
2868 | + |
2869 | + origvirt = PageHighMem(origpage) ? |
2870 | + kmap_atomic(origpage, KM_USER0) : |
2871 | + page_address(origpage); |
2872 | + |
2873 | + copyvirt = PageHighMem(copypage) ? |
2874 | + kmap_atomic(copypage, KM_USER1) : |
2875 | + page_address(copypage); |
2876 | + |
2877 | + while (loop >= 0) { |
2878 | + *(copyvirt + loop) = *(origvirt + loop); |
2879 | + loop--; |
2880 | + } |
2881 | + |
2882 | + if (PageHighMem(origpage)) |
2883 | + kunmap_atomic(origvirt, KM_USER0); |
2884 | + else if (suspend2_faulted) { |
2885 | + printk("%p (%lu) being unmapped after faulting during atomic copy.\n", origpage, source_index); |
2886 | + kernel_map_pages(origpage, 1, 0); |
2887 | + clear_suspend2_fault(); |
2888 | + } |
2889 | + |
2890 | + if (PageHighMem(copypage)) |
2891 | + kunmap_atomic(copyvirt, KM_USER1); |
2892 | + |
2893 | + source_index = get_next_bit_on(pageset1_map, source_index); |
2894 | + dest_index = get_next_bit_on(pageset1_copy_map, dest_index); |
2895 | + } |
2896 | +} |
2897 | + |
2898 | +/** |
2899 | + * __suspend_post_context_save: Steps after saving the cpu context. |
2900 | + * |
2901 | + * Steps taken after saving the CPU state to make the actual |
2902 | + * atomic copy. |
2903 | + * |
2904 | + * Called from swsusp_save in snapshot.c via suspend_post_context_save. |
2905 | + **/ |
2906 | + |
2907 | +int __suspend_post_context_save(void) |
2908 | +{ |
2909 | + int old_ps1_size = pagedir1.size; |
2910 | + |
2911 | + calculate_check_checksums(1); |
2912 | + |
2913 | + free_checksum_pages(); |
2914 | + |
2915 | + suspend_recalculate_image_contents(1); |
2916 | + |
2917 | + extra_pd1_pages_used = pagedir1.size - old_ps1_size; |
2918 | + |
2919 | + if (extra_pd1_pages_used > extra_pd1_pages_allowance) { |
2920 | + printk("Pageset1 has grown by %d pages. " |
2921 | + "extra_pages_allowance is currently only %d.\n", |
2922 | + pagedir1.size - old_ps1_size, |
2923 | + extra_pd1_pages_allowance); |
2924 | + set_result_state(SUSPEND_ABORTED); |
2925 | + set_result_state(SUSPEND_EXTRA_PAGES_ALLOW_TOO_SMALL); |
2926 | + return -1; |
2927 | + } |
2928 | + |
2929 | + if (!test_action_state(SUSPEND_TEST_FILTER_SPEED) && |
2930 | + !test_action_state(SUSPEND_TEST_BIO)) |
2931 | + suspend_copy_pageset1(); |
2932 | + |
2933 | + return 0; |
2934 | +} |
2935 | + |
2936 | +/** |
2937 | + * suspend2_suspend: High level code for doing the atomic copy. |
2938 | + * |
2939 | + * High-level code which prepares to do the atomic copy. Loosely based |
2940 | + * on the swsusp version, but with the following twists: |
2941 | + * - We set suspend2_running so the swsusp code uses our code paths. |
2942 | + * - We give better feedback regarding what goes wrong if there is a problem. |
2943 | + * - We use an extra function to call the assembly, just in case this code |
2944 | + * is in a module (return address). |
2945 | + **/ |
2946 | + |
2947 | +int suspend2_suspend(void) |
2948 | +{ |
2949 | + int error; |
2950 | + |
2951 | + suspend2_running = 1; /* For the swsusp code we use :< */ |
2952 | + |
2953 | + if (test_action_state(SUSPEND_PM_PREPARE_CONSOLE)) |
2954 | + pm_prepare_console(); |
2955 | + |
2956 | + if ((error = arch_prepare_suspend())) |
2957 | + goto err_out; |
2958 | + |
2959 | + local_irq_disable(); |
2960 | + |
2961 | + /* At this point, device_suspend() has been called, but *not* |
2962 | + * device_power_down(). We *must* device_power_down() now. |
2963 | + * Otherwise, drivers for some devices (e.g. interrupt controllers) |
2964 | + * become desynchronized with the actual state of the hardware |
2965 | + * at resume time, and evil weirdness ensues. |
2966 | + */ |
2967 | + |
2968 | + if ((error = device_power_down(PMSG_FREEZE))) { |
2969 | + set_result_state(SUSPEND_DEVICE_REFUSED); |
2970 | + set_result_state(SUSPEND_ABORTED); |
2971 | + printk(KERN_ERR "Some devices failed to power down, aborting suspend\n"); |
2972 | + goto enable_irqs; |
2973 | + } |
2974 | + |
2975 | + error = suspend2_lowlevel_builtin(); |
2976 | + |
2977 | + if (!suspend2_in_suspend) |
2978 | + copyback_high(); |
2979 | + |
2980 | + device_power_up(); |
2981 | +enable_irqs: |
2982 | + local_irq_enable(); |
2983 | + if (test_action_state(SUSPEND_PM_PREPARE_CONSOLE)) |
2984 | + pm_restore_console(); |
2985 | +err_out: |
2986 | + suspend2_running = 0; |
2987 | + return error; |
2988 | +} |
2989 | + |
2990 | +/** |
2991 | + * suspend_atomic_restore: Prepare to do the atomic restore. |
2992 | + * |
2993 | + * Get ready to do the atomic restore. This part gets us into the same |
2994 | + * state we are in prior to do calling do_suspend2_lowlevel while |
2995 | + * suspending: hot-unplugging secondary cpus and freeze processes, |
2996 | + * before starting the thread that will do the restore. |
2997 | + **/ |
2998 | + |
2999 | +int suspend_atomic_restore(void) |
3000 | +{ |
3001 | + int error, loop; |
3002 | + |
3003 | + suspend2_running = 1; |
3004 | + |
3005 | + suspend_prepare_status(DONT_CLEAR_BAR, "Prepare console"); |
3006 | + |
3007 | + if (test_action_state(SUSPEND_PM_PREPARE_CONSOLE)) |
3008 | + pm_prepare_console(); |
3009 | + |
3010 | + suspend_prepare_status(DONT_CLEAR_BAR, "Device suspend."); |
3011 | + |
3012 | + suspend_console(); |
3013 | + if ((error = device_suspend(PMSG_PRETHAW))) { |
3014 | + printk("Some devices failed to suspend\n"); |
3015 | + goto device_resume; |
3016 | + } |
3017 | + |
3018 | + if (test_action_state(SUSPEND_LATE_CPU_HOTPLUG)) { |
3019 | + suspend_prepare_status(DONT_CLEAR_BAR, "Disable nonboot cpus."); |
3020 | + if (disable_nonboot_cpus()) { |
3021 | + set_result_state(SUSPEND_CPU_HOTPLUG_FAILED); |
3022 | + set_result_state(SUSPEND_ABORTED); |
3023 | + goto device_resume; |
3024 | + } |
3025 | + } |
3026 | + |
3027 | + suspend_prepare_status(DONT_CLEAR_BAR, "Atomic restore preparation"); |
3028 | + |
3029 | + suspend2_nosave_state1 = suspend_action; |
3030 | + suspend2_nosave_state2 = suspend_debug_state; |
3031 | + suspend2_nosave_state3 = console_loglevel; |
3032 | + |
3033 | + for (loop = 0; loop < 4; loop++) |
3034 | + suspend2_nosave_io_speed[loop/2][loop%2] = |
3035 | + suspend_io_time[loop/2][loop%2]; |
3036 | + memcpy(suspend2_nosave_commandline, saved_command_line, COMMAND_LINE_SIZE); |
3037 | + |
3038 | + mb(); |
3039 | + |
3040 | + local_irq_disable(); |
3041 | + |
3042 | + if (device_power_down(PMSG_FREEZE)) { |
3043 | + printk(KERN_ERR "Some devices failed to power down. Very bad.\n"); |
3044 | + goto device_power_up; |
3045 | + } |
3046 | + |
3047 | + /* We'll ignore saved state, but this gets preempt count (etc) right */ |
3048 | + save_processor_state(); |
3049 | + |
3050 | + error = swsusp_arch_resume(); |
3051 | + /* |
3052 | + * Code below is only ever reached in case of failure. Otherwise |
3053 | + * execution continues at place where swsusp_arch_suspend was called. |
3054 | + * |
3055 | + * We don't know whether it's safe to continue (this shouldn't happen), |
3056 | + * so lets err on the side of caution. |
3057 | + */ |
3058 | + BUG(); |
3059 | + |
3060 | +device_power_up: |
3061 | + device_power_up(); |
3062 | + if (test_action_state(SUSPEND_LATE_CPU_HOTPLUG)) |
3063 | + enable_nonboot_cpus(); |
3064 | +device_resume: |
3065 | + device_resume(); |
3066 | + resume_console(); |
3067 | + free_pbe_list(&restore_pblist, 0); |
3068 | +#ifdef CONFIG_HIGHMEM |
3069 | + free_pbe_list(&restore_highmem_pblist, 1); |
3070 | +#endif |
3071 | + if (test_action_state(SUSPEND_PM_PREPARE_CONSOLE)) |
3072 | + pm_restore_console(); |
3073 | + suspend2_running = 0; |
3074 | + return 1; |
3075 | +} |
3076 | diff --git a/kernel/power/block_io.h b/kernel/power/block_io.h |
3077 | new file mode 100644 |
3078 | index 0000000..49eaa51 |
3079 | --- /dev/null |
3080 | +++ b/kernel/power/block_io.h |
3081 | @@ -0,0 +1,55 @@ |
3082 | +/* |
3083 | + * kernel/power/block_io.h |
3084 | + * |
3085 | + * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
3086 | + * Copyright (C) 2006 Red Hat, inc. |
3087 | + * |
3088 | + * Distributed under GPLv2. |
3089 | + * |
3090 | + * This file contains declarations for functions exported from |
3091 | + * block_io.c, which contains low level io functions. |
3092 | + */ |
3093 | + |
3094 | +#include <linux/buffer_head.h> |
3095 | +#include "extent.h" |
3096 | + |
3097 | +struct suspend_bdev_info { |
3098 | + struct block_device *bdev; |
3099 | + dev_t dev_t; |
3100 | + int bmap_shift; |
3101 | + int blocks_per_page; |
3102 | +}; |
3103 | + |
3104 | +/* |
3105 | + * Our exported interface so the swapwriter and filewriter don't |
3106 | + * need these functions duplicated. |
3107 | + */ |
3108 | +struct suspend_bio_ops { |
3109 | + int (*bdev_page_io) (int rw, struct block_device *bdev, long pos, |
3110 | + struct page *page); |
3111 | + void (*check_io_stats) (void); |
3112 | + void (*reset_io_stats) (void); |
3113 | + void (*finish_all_io) (void); |
3114 | + int (*forward_one_page) (void); |
3115 | + void (*set_extra_page_forward) (void); |
3116 | + void (*set_devinfo) (struct suspend_bdev_info *info); |
3117 | + int (*read_chunk) (unsigned long *index, struct page *buffer_page, |
3118 | + unsigned int *buf_size, int sync); |
3119 | + int (*write_chunk) (unsigned long index, struct page *buffer_page, |
3120 | + unsigned int buf_size); |
3121 | + void (*read_header_init) (void); |
3122 | + int (*rw_header_chunk) (int rw, struct suspend_module_ops *owner, |
3123 | + char *buffer, int buffer_size); |
3124 | + int (*write_header_chunk_finish) (void); |
3125 | + int (*rw_init) (int rw, int stream_number); |
3126 | + int (*rw_cleanup) (int rw); |
3127 | +}; |
3128 | + |
3129 | +extern struct suspend_bio_ops suspend_bio_ops; |
3130 | + |
3131 | +extern char *suspend_writer_buffer; |
3132 | +extern int suspend_writer_buffer_posn; |
3133 | +extern int suspend_read_fd; |
3134 | +extern struct extent_iterate_saved_state suspend_writer_posn_save[3]; |
3135 | +extern struct extent_iterate_state suspend_writer_posn; |
3136 | +extern int suspend_header_bytes_used; |
3137 | diff --git a/kernel/power/checksum.c b/kernel/power/checksum.c |
3138 | new file mode 100644 |
3139 | index 0000000..356af21 |
3140 | --- /dev/null |
3141 | +++ b/kernel/power/checksum.c |
3142 | @@ -0,0 +1,371 @@ |
3143 | +/* |
3144 | + * kernel/power/checksum.c |
3145 | + * |
3146 | + * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net) |
3147 | + * Copyright (C) 2006 Red Hat, inc. |
3148 | + * |
3149 | + * This file is released under the GPLv2. |
3150 | + * |
3151 | + * This file contains data checksum routines for suspend2, |
3152 | + * using cryptoapi. They are used to locate any modifications |
3153 | + * made to pageset 2 while we're saving it. |
3154 | + */ |
3155 | + |
3156 | +#include <linux/suspend.h> |
3157 | +#include <linux/module.h> |
3158 | +#include <linux/highmem.h> |
3159 | +#include <linux/vmalloc.h> |
3160 | +#include <linux/crypto.h> |
3161 | +#include <linux/scatterlist.h> |
3162 | + |
3163 | +#include "suspend.h" |
3164 | +#include "modules.h" |
3165 | +#include "sysfs.h" |
3166 | +#include "io.h" |
3167 | +#include "pageflags.h" |
3168 | +#include "checksum.h" |
3169 | +#include "pagedir.h" |
3170 | + |
3171 | +static struct suspend_module_ops suspend_checksum_ops; |
3172 | + |
3173 | +/* Constant at the mo, but I might allow tuning later */ |
3174 | +static char suspend_checksum_name[32] = "md5"; |
3175 | +/* Bytes per checksum */ |
3176 | +#define CHECKSUM_SIZE (128 / 8) |
3177 | + |
3178 | +#define CHECKSUMS_PER_PAGE ((PAGE_SIZE - sizeof(void *)) / CHECKSUM_SIZE) |
3179 | + |
3180 | +static struct crypto_hash *suspend_checksum_transform; |
3181 | +static struct hash_desc desc; |
3182 | +static int pages_allocated; |
3183 | +static unsigned long page_list; |
3184 | + |
3185 | +static int suspend_num_resaved = 0; |
3186 | + |
3187 | +#if 1 |
3188 | +#define PRINTK(a, b...) do { } while(0) |
3189 | +#else |
3190 | +#define PRINTK(a, b...) do { printk(a, ##b); } while(0) |
3191 | +#endif |
3192 | + |
3193 | +/* ---- Local buffer management ---- */ |
3194 | + |
3195 | +/* |
3196 | + * suspend_checksum_cleanup |
3197 | + * |
3198 | + * Frees memory allocated for our labours. |
3199 | + */ |
3200 | +static void suspend_checksum_cleanup(int ending_cycle) |
3201 | +{ |
3202 | + if (ending_cycle && suspend_checksum_transform) { |
3203 | + crypto_free_hash(suspend_checksum_transform); |
3204 | + suspend_checksum_transform = NULL; |
3205 | + desc.tfm = NULL; |
3206 | + } |
3207 | +} |
3208 | + |
3209 | +/* |
3210 | + * suspend_crypto_prepare |
3211 | + * |
3212 | + * Prepare to do some work by allocating buffers and transforms. |
3213 | + * Returns: Int: Zero. Even if we can't set up checksum, we still |
3214 | + * seek to suspend. |
3215 | + */ |
3216 | +static int suspend_checksum_prepare(int starting_cycle) |
3217 | +{ |
3218 | + if (!starting_cycle || !suspend_checksum_ops.enabled) |
3219 | + return 0; |
3220 | + |
3221 | + if (!*suspend_checksum_name) { |
3222 | + printk("Suspend2: No checksum algorithm name set.\n"); |
3223 | + return 1; |
3224 | + } |
3225 | + |
3226 | + suspend_checksum_transform = crypto_alloc_hash(suspend_checksum_name, 0, 0); |
3227 | + if (IS_ERR(suspend_checksum_transform)) { |
3228 | + printk("Suspend2: Failed to initialise the %s checksum algorithm: %ld.\n", |
3229 | + suspend_checksum_name, |
3230 | + (long) suspend_checksum_transform); |
3231 | + suspend_checksum_transform = NULL; |
3232 | + return 1; |
3233 | + } |
3234 | + |
3235 | + desc.tfm = suspend_checksum_transform; |
3236 | + desc.flags = 0; |
3237 | + |
3238 | + return 0; |
3239 | +} |
3240 | + |
3241 | +static int suspend_print_task_if_using_page(struct task_struct *t, struct page *seeking) |
3242 | +{ |
3243 | + struct vm_area_struct *vma; |
3244 | + struct mm_struct *mm; |
3245 | + int result = 0; |
3246 | + |
3247 | + mm = t->active_mm; |
3248 | + |
3249 | + if (!mm || !mm->mmap) return 0; |
3250 | + |
3251 | + /* Don't try to take the sem when processes are frozen, |
3252 | + * drivers are suspended and irqs are disabled. We're |
3253 | + * not racing with anything anyway. */ |
3254 | + if (!irqs_disabled()) |
3255 | + down_read(&mm->mmap_sem); |
3256 | + |
3257 | + for (vma = mm->mmap; vma; vma = vma->vm_next) { |
3258 | + if (vma->vm_flags & VM_PFNMAP) |
3259 | + continue; |
3260 | + if (vma->vm_start) { |
3261 | + unsigned long posn; |
3262 | + for (posn = vma->vm_start; posn < vma->vm_end; |
3263 | + posn += PAGE_SIZE) { |
3264 | + struct page *page = |
3265 | + follow_page(vma, posn, 0); |
3266 | + if (page == seeking) { |
3267 | + printk("%s(%d)", t->comm, t->pid); |
3268 | + result = 1; |
3269 | + goto out; |
3270 | + } |
3271 | + } |
3272 | + } |
3273 | + } |
3274 | + |
3275 | +out: |
3276 | + if (!irqs_disabled()) |
3277 | + up_read(&mm->mmap_sem); |
3278 | + |
3279 | + return result; |
3280 | +} |
3281 | + |
3282 | +static void print_tasks_using_page(struct page *seeking) |
3283 | +{ |
3284 | + struct task_struct *p; |
3285 | + |
3286 | + read_lock(&tasklist_lock); |
3287 | + for_each_process(p) { |
3288 | + if (suspend_print_task_if_using_page(p, seeking)) |
3289 | + printk(" "); |
3290 | + } |
3291 | + read_unlock(&tasklist_lock); |
3292 | +} |
3293 | + |
3294 | +/* |
3295 | + * suspend_checksum_print_debug_stats |
3296 | + * @buffer: Pointer to a buffer into which the debug info will be printed. |
3297 | + * @size: Size of the buffer. |
3298 | + * |
3299 | + * Print information to be recorded for debugging purposes into a buffer. |
3300 | + * Returns: Number of characters written to the buffer. |
3301 | + */ |
3302 | + |
3303 | +static int suspend_checksum_print_debug_stats(char *buffer, int size) |
3304 | +{ |
3305 | + int len; |
3306 | + |
3307 | + if (!suspend_checksum_ops.enabled) |
3308 | + return snprintf_used(buffer, size, |
3309 | + "- Checksumming disabled.\n"); |
3310 | + |
3311 | + len = snprintf_used(buffer, size, "- Checksum method is '%s'.\n", |
3312 | + suspend_checksum_name); |
3313 | + len+= snprintf_used(buffer + len, size - len, |
3314 | + " %d pages resaved in atomic copy.\n", suspend_num_resaved); |
3315 | + return len; |
3316 | +} |
3317 | + |
3318 | +static int suspend_checksum_storage_needed(void) |
3319 | +{ |
3320 | + if (suspend_checksum_ops.enabled) |
3321 | + return strlen(suspend_checksum_name) + sizeof(int) + 1; |
3322 | + else |
3323 | + return 0; |
3324 | +} |
3325 | + |
3326 | +/* |
3327 | + * suspend_checksum_save_config_info |
3328 | + * @buffer: Pointer to a buffer of size PAGE_SIZE. |
3329 | + * |
3330 | + * Save informaton needed when reloading the image at resume time. |
3331 | + * Returns: Number of bytes used for saving our data. |
3332 | + */ |
3333 | +static int suspend_checksum_save_config_info(char *buffer) |
3334 | +{ |
3335 | + int namelen = strlen(suspend_checksum_name) + 1; |
3336 | + int total_len; |
3337 | + |
3338 | + *((unsigned int *) buffer) = namelen; |
3339 | + strncpy(buffer + sizeof(unsigned int), suspend_checksum_name, |
3340 | + namelen); |
3341 | + total_len = sizeof(unsigned int) + namelen; |
3342 | + return total_len; |
3343 | +} |
3344 | + |
3345 | +/* suspend_checksum_load_config_info |
3346 | + * @buffer: Pointer to the start of the data. |
3347 | + * @size: Number of bytes that were saved. |
3348 | + * |
3349 | + * Description: Reload information needed for dechecksuming the image at |
3350 | + * resume time. |
3351 | + */ |
3352 | +static void suspend_checksum_load_config_info(char *buffer, int size) |
3353 | +{ |
3354 | + int namelen; |
3355 | + |
3356 | + namelen = *((unsigned int *) (buffer)); |
3357 | + strncpy(suspend_checksum_name, buffer + sizeof(unsigned int), |
3358 | + namelen); |
3359 | + return; |
3360 | +} |
3361 | + |
3362 | +/* |
3363 | + * Free Checksum Memory |
3364 | + */ |
3365 | + |
3366 | +void free_checksum_pages(void) |
3367 | +{ |
3368 | + PRINTK("Freeing %d checksum pages.\n", pages_allocated); |
3369 | + while (pages_allocated) { |
3370 | + unsigned long next = *((unsigned long *) page_list); |
3371 | + PRINTK("Page %3d is at %lx and points to %lx.\n", pages_allocated, page_list, next); |
3372 | + ClearPageNosave(virt_to_page(page_list)); |
3373 | + free_page((unsigned long) page_list); |
3374 | + page_list = next; |
3375 | + pages_allocated--; |
3376 | + } |
3377 | +} |
3378 | + |
3379 | +/* |
3380 | + * Allocate Checksum Memory |
3381 | + */ |
3382 | + |
3383 | +int allocate_checksum_pages(void) |
3384 | +{ |
3385 | + int pages_needed = DIV_ROUND_UP(pagedir2.size, CHECKSUMS_PER_PAGE); |
3386 | + |
3387 | + if (!suspend_checksum_ops.enabled) |
3388 | + return 0; |
3389 | + |
3390 | + PRINTK("Need %d checksum pages for %ld pageset2 pages.\n", pages_needed, pagedir2.size); |
3391 | + while (pages_allocated < pages_needed) { |
3392 | + unsigned long *new_page = |
3393 | + (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
3394 | + if (!new_page) |
3395 | + return -ENOMEM; |
3396 | + SetPageNosave(virt_to_page(new_page)); |
3397 | + (*new_page) = page_list; |
3398 | + page_list = (unsigned long) new_page; |
3399 | + pages_allocated++; |
3400 | + PRINTK("Page %3d is at %lx and points to %lx.\n", pages_allocated, page_list, *((unsigned long *) page_list)); |
3401 | + } |
3402 | + |
3403 | + return 0; |
3404 | +} |
3405 | + |
3406 | +#if 0 |
3407 | +static void print_checksum(char *buf, int size) |
3408 | +{ |
3409 | + int index; |
3410 | + |
3411 | + for (index = 0; index < size; index++) |
3412 | + printk("%x ", buf[index]); |
3413 | + |
3414 | + printk("\n"); |
3415 | +} |
3416 | +#endif |
3417 | + |
3418 | +/* |
3419 | + * Calculate checksums |
3420 | + */ |
3421 | + |
3422 | +void calculate_check_checksums(int check) |
3423 | +{ |
3424 | + int pfn, index = 0; |
3425 | + unsigned long next_page, this_checksum = 0; |
3426 | + struct scatterlist sg[2]; |
3427 | + char current_checksum[CHECKSUM_SIZE]; |
3428 | + |
3429 | + if (!suspend_checksum_ops.enabled) |
3430 | + return; |
3431 | + |
3432 | + next_page = (unsigned long) page_list; |
3433 | + |
3434 | + if (check) |
3435 | + suspend_num_resaved = 0; |
3436 | + |
3437 | + BITMAP_FOR_EACH_SET(pageset2_map, pfn) { |
3438 | + int ret; |
3439 | + if (index % CHECKSUMS_PER_PAGE) { |
3440 | + this_checksum += CHECKSUM_SIZE; |
3441 | + } else { |
3442 | + this_checksum = next_page + sizeof(void *); |
3443 | + next_page = *((unsigned long *) next_page); |
3444 | + } |
3445 | + PRINTK("Put checksum for page %3d %p in %lx.\n", index, page_address(pfn_to_page(pfn)), this_checksum); |
3446 | + sg_set_buf(&sg[0], page_address(pfn_to_page(pfn)), PAGE_SIZE); |
3447 | + if (check) { |
3448 | + ret = crypto_hash_digest(&desc, sg, |
3449 | + PAGE_SIZE, current_checksum); |
3450 | + if (memcmp(current_checksum, (char *) this_checksum, CHECKSUM_SIZE)) { |
3451 | + SetPageResave(pfn_to_page(pfn)); |
3452 | + printk("Page %d changed. Saving in atomic copy." |
3453 | + "Processes using it:", pfn); |
3454 | + print_tasks_using_page(pfn_to_page(pfn)); |
3455 | + printk("\n"); |
3456 | + suspend_num_resaved++; |
3457 | + if (test_action_state(SUSPEND_ABORT_ON_RESAVE_NEEDED)) |
3458 | + set_result_state(SUSPEND_ABORTED); |
3459 | + } |
3460 | + } else |
3461 | + ret = crypto_hash_digest(&desc, sg, |
3462 | + PAGE_SIZE, (char *) this_checksum); |
3463 | + if (ret) { |
3464 | + printk("Digest failed. Returned %d.\n", ret); |
3465 | + return; |
3466 | + } |
3467 | + index++; |
3468 | + } |
3469 | +} |
3470 | + |
3471 | +static struct suspend_sysfs_data sysfs_params[] = { |
3472 | + { SUSPEND2_ATTR("enabled", SYSFS_RW), |
3473 | + SYSFS_INT(&suspend_checksum_ops.enabled, 0, 1, 0) |
3474 | + }, |
3475 | + |
3476 | + { SUSPEND2_ATTR("abort_if_resave_needed", SYSFS_RW), |
3477 | + SYSFS_BIT(&suspend_action, SUSPEND_ABORT_ON_RESAVE_NEEDED, 0) |
3478 | + } |
3479 | +}; |
3480 | + |
3481 | +/* |
3482 | + * Ops structure. |
3483 | + */ |
3484 | +static struct suspend_module_ops suspend_checksum_ops = { |
3485 | + .type = MISC_MODULE, |
3486 | + .name = "Checksumming", |
3487 | + .directory = "checksum", |
3488 | + .module = THIS_MODULE, |
3489 | + .initialise = suspend_checksum_prepare, |
3490 | + .cleanup = suspend_checksum_cleanup, |
3491 | + .print_debug_info = suspend_checksum_print_debug_stats, |
3492 | + .save_config_info = suspend_checksum_save_config_info, |
3493 | + .load_config_info = suspend_checksum_load_config_info, |
3494 | + .storage_needed = suspend_checksum_storage_needed, |
3495 | + |
3496 | + .sysfs_data = sysfs_params, |
3497 | + .num_sysfs_entries = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data), |
3498 | +}; |
3499 | + |
3500 | +/* ---- Registration ---- */ |
3501 | +int s2_checksum_init(void) |
3502 | +{ |
3503 | + int result = suspend_register_module(&suspend_checksum_ops); |
3504 | + |
3505 | + /* Disabled by default */ |
3506 | + suspend_checksum_ops.enabled = 0; |
3507 | + return result; |
3508 | +} |
3509 | + |
3510 | +void s2_checksum_exit(void) |
3511 | +{ |
3512 | + suspend_unregister_module(&suspend_checksum_ops); |
3513 | +} |
3514 | diff --git a/kernel/power/checksum.h b/kernel/power/checksum.h |
3515 | new file mode 100644 |
3516 | index 0000000..9984eec |
3517 | --- /dev/null |
3518 | +++ b/kernel/power/checksum.h |
3519 | @@ -0,0 +1,27 @@ |
3520 | +/* |
3521 | + * kernel/power/checksum.h |
3522 | + * |
3523 | + * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net) |
3524 | + * Copyright (C) 2006 Red Hat, inc. |
3525 | + * |
3526 | + * This file is released under the GPLv2. |
3527 | + * |
3528 | + * This file contains data checksum routines for suspend2, |
3529 | + * using cryptoapi. They are used to locate any modifications |
3530 | + * made to pageset 2 while we're saving it. |
3531 | + */ |
3532 | + |
3533 | +#if defined(CONFIG_SUSPEND2_CHECKSUM) |
3534 | +extern int s2_checksum_init(void); |
3535 | +extern void s2_checksum_exit(void); |
3536 | +void calculate_check_checksums(int check); |
3537 | +int allocate_checksum_pages(void); |
3538 | +void free_checksum_pages(void); |
3539 | +#else |
3540 | +static inline int s2_checksum_init(void) { return 0; } |
3541 | +static inline void s2_checksum_exit(void) { } |
3542 | +static inline void calculate_check_checksums(int check) { }; |
3543 | +static inline int allocate_checksum_pages(void) { return 0; }; |
3544 | +static inline void free_checksum_pages(void) { }; |
3545 | +#endif |
3546 | + |
3547 | diff --git a/kernel/power/cluster.c b/kernel/power/cluster.c |
3548 | new file mode 100644 |
3549 | index 0000000..b5ab9ad |
3550 | --- /dev/null |
3551 | +++ b/kernel/power/cluster.c |
3552 | @@ -0,0 +1,152 @@ |
3553 | +/* |
3554 | + * kernel/power/cluster.c |
3555 | + * |
3556 | + * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net) |
3557 | + * |
3558 | + * This file is released under the GPLv2. |
3559 | + * |
3560 | + * This file contains routines for cluster hibernation support. |
3561 | + * |
3562 | + */ |
3563 | + |
3564 | +#include <linux/suspend.h> |
3565 | +#include <linux/module.h> |
3566 | + |
3567 | +#include "suspend.h" |
3568 | +#include "modules.h" |
3569 | +#include "sysfs.h" |
3570 | +#include "io.h" |
3571 | + |
3572 | +static char suspend_cluster_master[63] = CONFIG_SUSPEND2_DEFAULT_CLUSTER_MASTER; |
3573 | + |
3574 | +static struct suspend_module_ops suspend_cluster_ops; |
3575 | + |
3576 | +/* suspend_cluster_print_debug_stats |
3577 | + * |
3578 | + * Description: Print information to be recorded for debugging purposes into a |
3579 | + * buffer. |
3580 | + * Arguments: buffer: Pointer to a buffer into which the debug info will be |
3581 | + * printed. |
3582 | + * size: Size of the buffer. |
3583 | + * Returns: Number of characters written to the buffer. |
3584 | + */ |
3585 | +static int suspend_cluster_print_debug_stats(char *buffer, int size) |
3586 | +{ |
3587 | + int len; |
3588 | + |
3589 | + if (strlen(suspend_cluster_master)) |
3590 | + len = snprintf_used(buffer, size, "- Cluster master is '%s'.\n", |
3591 | + suspend_cluster_master); |
3592 | + else |
3593 | + len = snprintf_used(buffer, size, "- Cluster support is disabled.\n"); |
3594 | + return len; |
3595 | +} |
3596 | + |
3597 | +/* cluster_memory_needed |
3598 | + * |
3599 | + * Description: Tell the caller how much memory we need to operate during |
3600 | + * suspend/resume. |
3601 | + * Returns: Unsigned long. Maximum number of bytes of memory required for |
3602 | + * operation. |
3603 | + */ |
3604 | +static int suspend_cluster_memory_needed(void) |
3605 | +{ |
3606 | + return 0; |
3607 | +} |
3608 | + |
3609 | +static int suspend_cluster_storage_needed(void) |
3610 | +{ |
3611 | + return 1 + strlen(suspend_cluster_master); |
3612 | +} |
3613 | + |
3614 | +/* suspend_cluster_save_config_info |
3615 | + * |
3616 | + * Description: Save informaton needed when reloading the image at resume time. |
3617 | + * Arguments: Buffer: Pointer to a buffer of size PAGE_SIZE. |
3618 | + * Returns: Number of bytes used for saving our data. |
3619 | + */ |
3620 | +static int suspend_cluster_save_config_info(char *buffer) |
3621 | +{ |
3622 | + strcpy(buffer, suspend_cluster_master); |
3623 | + return strlen(suspend_cluster_master + 1); |
3624 | +} |
3625 | + |
3626 | +/* suspend_cluster_load_config_info |
3627 | + * |
3628 | + * Description: Reload information needed for declustering the image at |
3629 | + * resume time. |
3630 | + * Arguments: Buffer: Pointer to the start of the data. |
3631 | + * Size: Number of bytes that were saved. |
3632 | + */ |
3633 | +static void suspend_cluster_load_config_info(char *buffer, int size) |
3634 | +{ |
3635 | + strncpy(suspend_cluster_master, buffer, size); |
3636 | + return; |
3637 | +} |
3638 | + |
3639 | +/* |
3640 | + * data for our sysfs entries. |
3641 | + */ |
3642 | +static struct suspend_sysfs_data sysfs_params[] = { |
3643 | + { |
3644 | + SUSPEND2_ATTR("master", SYSFS_RW), |
3645 | + SYSFS_STRING(suspend_cluster_master, 63, SYSFS_SM_NOT_NEEDED) |
3646 | + }, |
3647 | + |
3648 | + { |
3649 | + SUSPEND2_ATTR("enabled", SYSFS_RW), |
3650 | + SYSFS_INT(&suspend_cluster_ops.enabled, 0, 1) |
3651 | + } |
3652 | +}; |
3653 | + |
3654 | +/* |
3655 | + * Ops structure. |
3656 | + */ |
3657 | + |
3658 | +static struct suspend_module_ops suspend_cluster_ops = { |
3659 | + .type = FILTER_MODULE, |
3660 | + .name = "Cluster", |
3661 | + .directory = "cluster", |
3662 | + .module = THIS_MODULE, |
3663 | + .memory_needed = suspend_cluster_memory_needed, |
3664 | + .print_debug_info = suspend_cluster_print_debug_stats, |
3665 | + .save_config_info = suspend_cluster_save_config_info, |
3666 | + .load_config_info = suspend_cluster_load_config_info, |
3667 | + .storage_needed = suspend_cluster_storage_needed, |
3668 | + |
3669 | + .sysfs_data = sysfs_params, |
3670 | + .num_sysfs_entries = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data), |
3671 | +}; |
3672 | + |
3673 | +/* ---- Registration ---- */ |
3674 | + |
3675 | +#ifdef MODULE |
3676 | +#warning Module set. |
3677 | +#define INIT static __init |
3678 | +#define EXIT static __exit |
3679 | +#else |
3680 | +#define INIT |
3681 | +#define EXIT |
3682 | +#endif |
3683 | + |
3684 | +INIT int s2_cluster_init(void) |
3685 | +{ |
3686 | + int temp = suspend_register_module(&suspend_cluster_ops); |
3687 | + |
3688 | + if (!strlen(suspend_cluster_master)) |
3689 | + suspend_cluster_ops.enabled = 0; |
3690 | + return temp; |
3691 | +} |
3692 | + |
3693 | +EXIT void s2_cluster_exit(void) |
3694 | +{ |
3695 | + suspend_unregister_module(&suspend_cluster_ops); |
3696 | +} |
3697 | + |
3698 | +#ifdef MODULE |
3699 | +MODULE_LICENSE("GPL"); |
3700 | +module_init(s2_cluster_init); |
3701 | +module_exit(s2_cluster_exit); |
3702 | +MODULE_AUTHOR("Nigel Cunningham"); |
3703 | +MODULE_DESCRIPTION("Cluster Support for Suspend2"); |
3704 | +#endif |
3705 | diff --git a/kernel/power/cluster.h b/kernel/power/cluster.h |
3706 | new file mode 100644 |
3707 | index 0000000..d44bbf7 |
3708 | --- /dev/null |
3709 | +++ b/kernel/power/cluster.h |
3710 | @@ -0,0 +1,17 @@ |
3711 | +/* |
3712 | + * kernel/power/cluster.h |
3713 | + * |
3714 | + * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net) |
3715 | + * Copyright (C) 2006 Red Hat, inc. |
3716 | + * |
3717 | + * This file is released under the GPLv2. |
3718 | + */ |
3719 | + |
3720 | +#ifdef CONFIG_SUSPEND2_CLUSTER |
3721 | +extern int s2_cluster_init(void); |
3722 | +extern void s2_cluster_exit(void); |
3723 | +#else |
3724 | +static inline int s2_cluster_init(void) { return 0; } |
3725 | +static inline void s2_cluster_exit(void) { } |
3726 | +#endif |
3727 | + |
3728 | diff --git a/kernel/power/disk.c b/kernel/power/disk.c |
3729 | index aec19b0..5d014f1 100644 |
3730 | --- a/kernel/power/disk.c |
3731 | +++ b/kernel/power/disk.c |
3732 | @@ -24,6 +24,8 @@ |
3733 | |
3734 | #include "power.h" |
3735 | |
3736 | +#include "suspend.h" |
3737 | +#include "suspend2_builtin.h" |
3738 | |
3739 | static int noresume = 0; |
3740 | char resume_file[256] = CONFIG_PM_STD_PARTITION; |
3741 | @@ -118,6 +120,11 @@ int pm_suspend_disk(void) |
3742 | { |
3743 | int error; |
3744 | |
3745 | +#ifdef CONFIG_SUSPEND2 |
3746 | + if (test_action_state(SUSPEND_REPLACE_SWSUSP)) |
3747 | + return suspend2_try_suspend(1); |
3748 | +#endif |
3749 | + |
3750 | error = prepare_processes(); |
3751 | if (error) |
3752 | return error; |
3753 | @@ -200,10 +207,22 @@ int pm_suspend_disk(void) |
3754 | * |
3755 | */ |
3756 | |
3757 | -static int software_resume(void) |
3758 | +int software_resume(void) |
3759 | { |
3760 | int error; |
3761 | |
3762 | + resume_attempted = 1; |
3763 | + |
3764 | +#ifdef CONFIG_SUSPEND2 |
3765 | + /* |
3766 | + * We can't know (until an image header - if any - is loaded), whether |
3767 | + * we did override swsusp. We therefore ensure that both are tried. |
3768 | + */ |
3769 | + if (test_action_state(SUSPEND_REPLACE_SWSUSP)) |
3770 | + printk("Replacing swsusp.\n"); |
3771 | + suspend2_try_resume(); |
3772 | +#endif |
3773 | + |
3774 | mutex_lock(&pm_mutex); |
3775 | if (!swsusp_resume_device) { |
3776 | if (!strlen(resume_file)) { |
3777 | @@ -274,9 +293,6 @@ static int software_resume(void) |
3778 | return 0; |
3779 | } |
3780 | |
3781 | -late_initcall(software_resume); |
3782 | - |
3783 | - |
3784 | static const char * const pm_disk_modes[] = { |
3785 | [PM_DISK_FIRMWARE] = "firmware", |
3786 | [PM_DISK_PLATFORM] = "platform", |
3787 | @@ -457,6 +473,7 @@ static int __init resume_offset_setup(char *str) |
3788 | static int __init noresume_setup(char *str) |
3789 | { |
3790 | noresume = 1; |
3791 | + set_suspend_state(SUSPEND_NORESUME_SPECIFIED); |
3792 | return 1; |
3793 | } |
3794 | |
3795 | diff --git a/kernel/power/extent.c b/kernel/power/extent.c |
3796 | new file mode 100644 |
3797 | index 0000000..cd0ff0c |
3798 | --- /dev/null |
3799 | +++ b/kernel/power/extent.c |
3800 | @@ -0,0 +1,305 @@ |
3801 | +/* |
3802 | + * kernel/power/extent.c |
3803 | + * |
3804 | + * Copyright (C) 2003-2007 Nigel Cunningham (nigel at suspend2 net) |
3805 | + * |
3806 | + * Distributed under GPLv2. |
3807 | + * |
3808 | + * These functions encapsulate the manipulation of storage metadata. For |
3809 | + * pageflags, we use dynamically allocated bitmaps. |
3810 | + */ |
3811 | + |
3812 | +#include <linux/module.h> |
3813 | +#include <linux/suspend.h> |
3814 | +#include "modules.h" |
3815 | +#include "extent.h" |
3816 | +#include "ui.h" |
3817 | +#include "suspend.h" |
3818 | + |
3819 | +/* suspend_get_extent |
3820 | + * |
3821 | + * Returns a free extent. May fail, returning NULL instead. |
3822 | + */ |
3823 | +static struct extent *suspend_get_extent(void) |
3824 | +{ |
3825 | + struct extent *result; |
3826 | + |
3827 | + if (!(result = kmalloc(sizeof(struct extent), GFP_ATOMIC))) |
3828 | + return NULL; |
3829 | + |
3830 | + result->minimum = result->maximum = 0; |
3831 | + result->next = NULL; |
3832 | + |
3833 | + return result; |
3834 | +} |
3835 | + |
3836 | +/* suspend_put_extent_chain. |
3837 | + * |
3838 | + * Frees a whole chain of extents. |
3839 | + */ |
3840 | +void suspend_put_extent_chain(struct extent_chain *chain) |
3841 | +{ |
3842 | + struct extent *this; |
3843 | + |
3844 | + this = chain->first; |
3845 | + |
3846 | + while(this) { |
3847 | + struct extent *next = this->next; |
3848 | + kfree(this); |
3849 | + chain->num_extents--; |
3850 | + this = next; |
3851 | + } |
3852 | + |
3853 | + chain->first = chain->last_touched = NULL; |
3854 | + chain->size = 0; |
3855 | +} |
3856 | + |
3857 | +/* |
3858 | + * suspend_add_to_extent_chain |
3859 | + * |
3860 | + * Add an extent to an existing chain. |
3861 | + */ |
3862 | +int suspend_add_to_extent_chain(struct extent_chain *chain, |
3863 | + unsigned long minimum, unsigned long maximum) |
3864 | +{ |
3865 | + struct extent *new_extent = NULL, *start_at; |
3866 | + |
3867 | + /* Find the right place in the chain */ |
3868 | + start_at = (chain->last_touched && |
3869 | + (chain->last_touched->minimum < minimum)) ? |
3870 | + chain->last_touched : NULL; |
3871 | + |
3872 | + if (!start_at && chain->first && chain->first->minimum < minimum) |
3873 | + start_at = chain->first; |
3874 | + |
3875 | + while (start_at && start_at->next && start_at->next->minimum < minimum) |
3876 | + start_at = start_at->next; |
3877 | + |
3878 | + if (start_at && start_at->maximum == (minimum - 1)) { |
3879 | + start_at->maximum = maximum; |
3880 | + |
3881 | + /* Merge with the following one? */ |
3882 | + if (start_at->next && |
3883 | + start_at->maximum + 1 == start_at->next->minimum) { |
3884 | + struct extent *to_free = start_at->next; |
3885 | + start_at->maximum = start_at->next->maximum; |
3886 | + start_at->next = start_at->next->next; |
3887 | + chain->num_extents--; |
3888 | + kfree(to_free); |
3889 | + } |
3890 | + |
3891 | + chain->last_touched = start_at; |
3892 | + chain->size+= (maximum - minimum + 1); |
3893 | + |
3894 | + return 0; |
3895 | + } |
3896 | + |
3897 | + new_extent = suspend_get_extent(); |
3898 | + if (!new_extent) { |
3899 | + printk("Error unable to append a new extent to the chain.\n"); |
3900 | + return 2; |
3901 | + } |
3902 | + |
3903 | + chain->num_extents++; |
3904 | + chain->size+= (maximum - minimum + 1); |
3905 | + new_extent->minimum = minimum; |
3906 | + new_extent->maximum = maximum; |
3907 | + new_extent->next = NULL; |
3908 | + |
3909 | + chain->last_touched = new_extent; |
3910 | + |
3911 | + if (start_at) { |
3912 | + struct extent *next = start_at->next; |
3913 | + start_at->next = new_extent; |
3914 | + new_extent->next = next; |
3915 | + } else { |
3916 | + if (chain->first) |
3917 | + new_extent->next = chain->first; |
3918 | + chain->first = new_extent; |
3919 | + } |
3920 | + |
3921 | + return 0; |
3922 | +} |
3923 | + |
3924 | +/* suspend_serialise_extent_chain |
3925 | + * |
3926 | + * Write a chain in the image. |
3927 | + */ |
3928 | +int suspend_serialise_extent_chain(struct suspend_module_ops *owner, |
3929 | + struct extent_chain *chain) |
3930 | +{ |
3931 | + struct extent *this; |
3932 | + int ret, i = 0; |
3933 | + |
3934 | + if ((ret = suspendActiveAllocator->rw_header_chunk(WRITE, owner, |
3935 | + (char *) chain, |
3936 | + 2 * sizeof(int)))) |
3937 | + return ret; |
3938 | + |
3939 | + this = chain->first; |
3940 | + while (this) { |
3941 | + if ((ret = suspendActiveAllocator->rw_header_chunk(WRITE, owner, |
3942 | + (char *) this, |
3943 | + 2 * sizeof(unsigned long)))) |
3944 | + return ret; |
3945 | + this = this->next; |
3946 | + i++; |
3947 | + } |
3948 | + |
3949 | + if (i != chain->num_extents) { |
3950 | + printk(KERN_EMERG "Saved %d extents but chain metadata says there " |
3951 | + "should be %d.\n", i, chain->num_extents); |
3952 | + return 1; |
3953 | + } |
3954 | + |
3955 | + return ret; |
3956 | +} |
3957 | + |
3958 | +/* suspend_load_extent_chain |
3959 | + * |
3960 | + * Read back a chain saved in the image. |
3961 | + */ |
3962 | +int suspend_load_extent_chain(struct extent_chain *chain) |
3963 | +{ |
3964 | + struct extent *this, *last = NULL; |
3965 | + int i, ret; |
3966 | + |
3967 | + if ((ret = suspendActiveAllocator->rw_header_chunk(READ, NULL, |
3968 | + (char *) chain, 2 * sizeof(int)))) { |
3969 | + printk("Failed to read size of extent chain.\n"); |
3970 | + return 1; |
3971 | + } |
3972 | + |
3973 | + for (i = 0; i < chain->num_extents; i++) { |
3974 | + this = kmalloc(sizeof(struct extent), GFP_ATOMIC); |
3975 | + if (!this) { |
3976 | + printk("Failed to allocate a new extent.\n"); |
3977 | + return -ENOMEM; |
3978 | + } |
3979 | + this->next = NULL; |
3980 | + if ((ret = suspendActiveAllocator->rw_header_chunk(READ, NULL, |
3981 | + (char *) this, 2 * sizeof(unsigned long)))) { |
3982 | + printk("Failed to an extent.\n"); |
3983 | + return 1; |
3984 | + } |
3985 | + if (last) |
3986 | + last->next = this; |
3987 | + else |
3988 | + chain->first = this; |
3989 | + last = this; |
3990 | + } |
3991 | + return 0; |
3992 | +} |
3993 | + |
3994 | +/* suspend_extent_state_next |
3995 | + * |
3996 | + * Given a state, progress to the next valid entry. We may begin in an |
3997 | + * invalid state, as we do when invoked after extent_state_goto_start below. |
3998 | + * |
3999 | + * When using compression and expected_compression > 0, we let the image size |
4000 | + * be larger than storage, so we can validly run out of data to return. |
4001 | + */ |
4002 | +unsigned long suspend_extent_state_next(struct extent_iterate_state *state) |
4003 | +{ |
4004 | + if (state->current_chain == state->num_chains) |
4005 | + return 0; |
4006 | + |
4007 | + if (state->current_extent) { |
4008 | + if (state->current_offset == state->current_extent->maximum) { |
4009 | + if (state->current_extent->next) { |
4010 | + state->current_extent = state->current_extent->next; |
4011 | + state->current_offset = state->current_extent->minimum; |
4012 | + } else { |
4013 | + state->current_extent = NULL; |
4014 | + state->current_offset = 0; |
4015 | + } |
4016 | + } else |
4017 | + state->current_offset++; |
4018 | + } |
4019 | + |
4020 | + while(!state->current_extent) { |
4021 | + int chain_num = ++(state->current_chain); |
4022 | + |
4023 | + if (chain_num == state->num_chains) |
4024 | + return 0; |
4025 | + |
4026 | + state->current_extent = (state->chains + chain_num)->first; |
4027 | + |
4028 | + if (!state->current_extent) |
4029 | + continue; |
4030 | + |
4031 | + state->current_offset = state->current_extent->minimum; |
4032 | + } |
4033 | + |
4034 | + return state->current_offset; |
4035 | +} |
4036 | + |
4037 | +/* suspend_extent_state_goto_start |
4038 | + * |
4039 | + * Find the first valid value in a group of chains. |
4040 | + */ |
4041 | +void suspend_extent_state_goto_start(struct extent_iterate_state *state) |
4042 | +{ |
4043 | + state->current_chain = -1; |
4044 | + state->current_extent = NULL; |
4045 | + state->current_offset = 0; |
4046 | +} |
4047 | + |
4048 | +/* suspend_extent_start_save |
4049 | + * |
4050 | + * Given a state and a struct extent_state_store, save the current |
4051 | + * position in a format that can be used with relocated chains (at |
4052 | + * resume time). |
4053 | + */ |
4054 | +void suspend_extent_state_save(struct extent_iterate_state *state, |
4055 | + struct extent_iterate_saved_state *saved_state) |
4056 | +{ |
4057 | + struct extent *extent; |
4058 | + |
4059 | + saved_state->chain_num = state->current_chain; |
4060 | + saved_state->extent_num = 0; |
4061 | + saved_state->offset = state->current_offset; |
4062 | + |
4063 | + if (saved_state->chain_num == -1) |
4064 | + return; |
4065 | + |
4066 | + extent = (state->chains + state->current_chain)->first; |
4067 | + |
4068 | + while (extent != state->current_extent) { |
4069 | + saved_state->extent_num++; |
4070 | + extent = extent->next; |
4071 | + } |
4072 | +} |
4073 | + |
4074 | +/* suspend_extent_start_restore |
4075 | + * |
4076 | + * Restore the position saved by extent_state_save. |
4077 | + */ |
4078 | +void suspend_extent_state_restore(struct extent_iterate_state *state, |
4079 | + struct extent_iterate_saved_state *saved_state) |
4080 | +{ |
4081 | + int posn = saved_state->extent_num; |
4082 | + |
4083 | + if (saved_state->chain_num == -1) { |
4084 | + suspend_extent_state_goto_start(state); |
4085 | + return; |
4086 | + } |
4087 | + |
4088 | + state->current_chain = saved_state->chain_num; |
4089 | + state->current_extent = (state->chains + state->current_chain)->first; |
4090 | + state->current_offset = saved_state->offset; |
4091 | + |
4092 | + while (posn--) |
4093 | + state->current_extent = state->current_extent->next; |
4094 | +} |
4095 | + |
4096 | +#ifdef CONFIG_SUSPEND2_EXPORTS |
4097 | +EXPORT_SYMBOL_GPL(suspend_add_to_extent_chain); |
4098 | +EXPORT_SYMBOL_GPL(suspend_put_extent_chain); |
4099 | +EXPORT_SYMBOL_GPL(suspend_load_extent_chain); |
4100 | +EXPORT_SYMBOL_GPL(suspend_serialise_extent_chain); |
4101 | +EXPORT_SYMBOL_GPL(suspend_extent_state_save); |
4102 | +EXPORT_SYMBOL_GPL(suspend_extent_state_restore); |
4103 | +EXPORT_SYMBOL_GPL(suspend_extent_state_goto_start); |
4104 | +EXPORT_SYMBOL_GPL(suspend_extent_state_next); |
4105 | +#endif |
4106 | diff --git a/kernel/power/extent.h b/kernel/power/extent.h |
4107 | new file mode 100644 |
4108 | index 0000000..c97772b |
4109 | --- /dev/null |
4110 | +++ b/kernel/power/extent.h |
4111 | @@ -0,0 +1,77 @@ |
4112 | +/* |
4113 | + * kernel/power/extent.h |
4114 | + * |
4115 | + * Copyright (C) 2003-2007 Nigel Cunningham (nigel at suspend2 net) |
4116 | + * |
4117 | + * This file is released under the GPLv2. |
4118 | + * |
4119 | + * It contains declarations related to extents. Extents are |
4120 | + * suspend's method of storing some of the metadata for the image. |
4121 | + * See extent.c for more info. |
4122 | + * |
4123 | + */ |
4124 | + |
4125 | +#include "modules.h" |
4126 | + |
4127 | +#ifndef EXTENT_H |
4128 | +#define EXTENT_H |
4129 | + |
4130 | +struct extent { |
4131 | + unsigned long minimum, maximum; |
4132 | + struct extent *next; |
4133 | +}; |
4134 | + |
4135 | +struct extent_chain { |
4136 | + int size; /* size of the chain ie sum (max-min+1) */ |
4137 | + int num_extents; |
4138 | + struct extent *first, *last_touched; |
4139 | +}; |
4140 | + |
4141 | +struct extent_iterate_state { |
4142 | + struct extent_chain *chains; |
4143 | + int num_chains; |
4144 | + int current_chain; |
4145 | + struct extent *current_extent; |
4146 | + unsigned long current_offset; |
4147 | +}; |
4148 | + |
4149 | +struct extent_iterate_saved_state { |
4150 | + int chain_num; |
4151 | + int extent_num; |
4152 | + unsigned long offset; |
4153 | +}; |
4154 | + |
4155 | +#define suspend_extent_state_eof(state) ((state)->num_chains == (state)->current_chain) |
4156 | + |
4157 | +/* Simplify iterating through all the values in an extent chain */ |
4158 | +#define suspend_extent_for_each(extent_chain, extentpointer, value) \ |
4159 | +if ((extent_chain)->first) \ |
4160 | + for ((extentpointer) = (extent_chain)->first, (value) = \ |
4161 | + (extentpointer)->minimum; \ |
4162 | + ((extentpointer) && ((extentpointer)->next || (value) <= \ |
4163 | + (extentpointer)->maximum)); \ |
4164 | + (((value) == (extentpointer)->maximum) ? \ |
4165 | + ((extentpointer) = (extentpointer)->next, (value) = \ |
4166 | + ((extentpointer) ? (extentpointer)->minimum : 0)) : \ |
4167 | + (value)++)) |
4168 | + |
4169 | +void suspend_put_extent_chain(struct extent_chain *chain); |
4170 | +int suspend_add_to_extent_chain(struct extent_chain *chain, |
4171 | + unsigned long minimum, unsigned long maximum); |
4172 | +int suspend_serialise_extent_chain(struct suspend_module_ops *owner, |
4173 | + struct extent_chain *chain); |
4174 | +int suspend_load_extent_chain(struct extent_chain *chain); |
4175 | + |
4176 | +/* swap_entry_to_extent_val & extent_val_to_swap_entry: |
4177 | + * We are putting offset in the low bits so consecutive swap entries |
4178 | + * make consecutive extent values */ |
4179 | +#define swap_entry_to_extent_val(swp_entry) (swp_entry.val) |
4180 | +#define extent_val_to_swap_entry(val) (swp_entry_t) { (val) } |
4181 | + |
4182 | +void suspend_extent_state_save(struct extent_iterate_state *state, |
4183 | + struct extent_iterate_saved_state *saved_state); |
4184 | +void suspend_extent_state_restore(struct extent_iterate_state *state, |
4185 | + struct extent_iterate_saved_state *saved_state); |
4186 | +void suspend_extent_state_goto_start(struct extent_iterate_state *state); |
4187 | +unsigned long suspend_extent_state_next(struct extent_iterate_state *state); |
4188 | +#endif |
4189 | diff --git a/kernel/power/io.c b/kernel/power/io.c |
4190 | new file mode 100644 |
4191 | index 0000000..854d1a7 |
4192 | --- /dev/null |
4193 | +++ b/kernel/power/io.c |
4194 | @@ -0,0 +1,1407 @@ |
4195 | +/* |
4196 | + * kernel/power/io.c |
4197 | + * |
4198 | + * Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu> |
4199 | + * Copyright (C) 1998,2001,2002 Pavel Machek <pavel@suse.cz> |
4200 | + * Copyright (C) 2002-2003 Florent Chabaud <fchabaud@free.fr> |
4201 | + * Copyright (C) 2002-2007 Nigel Cunningham (nigel at suspend2 net) |
4202 | + * |
4203 | + * This file is released under the GPLv2. |
4204 | + * |
4205 | + * It contains high level IO routines for suspending. |
4206 | + * |
4207 | + */ |
4208 | + |
4209 | +#include <linux/suspend.h> |
4210 | +#include <linux/version.h> |
4211 | +#include <linux/utsname.h> |
4212 | +#include <linux/mount.h> |
4213 | +#include <linux/highmem.h> |
4214 | +#include <linux/module.h> |
4215 | +#include <linux/kthread.h> |
4216 | +#include <asm/tlbflush.h> |
4217 | + |
4218 | +#include "suspend.h" |
4219 | +#include "modules.h" |
4220 | +#include "pageflags.h" |
4221 | +#include "io.h" |
4222 | +#include "ui.h" |
4223 | +#include "storage.h" |
4224 | +#include "prepare_image.h" |
4225 | +#include "extent.h" |
4226 | +#include "sysfs.h" |
4227 | +#include "suspend2_builtin.h" |
4228 | + |
4229 | +char poweroff_resume2[256]; |
4230 | + |
4231 | +/* Variables shared between threads and updated under the mutex */ |
4232 | +static int io_write, io_finish_at, io_base, io_barmax, io_pageset, io_result; |
4233 | +static int io_index, io_nextupdate, io_pc, io_pc_step; |
4234 | +static unsigned long pfn, other_pfn; |
4235 | +static DEFINE_MUTEX(io_mutex); |
4236 | +static DEFINE_PER_CPU(struct page *, last_sought); |
4237 | +static DEFINE_PER_CPU(struct page *, last_high_page); |
4238 | +static DEFINE_PER_CPU(struct pbe *, last_low_page); |
4239 | +static atomic_t worker_thread_count; |
4240 | +static atomic_t io_count; |
4241 | + |
4242 | +/* suspend_attempt_to_parse_resume_device |
4243 | + * |
4244 | + * Can we suspend, using the current resume2= parameter? |
4245 | + */ |
4246 | +int suspend_attempt_to_parse_resume_device(int quiet) |
4247 | +{ |
4248 | + struct list_head *Allocator; |
4249 | + struct suspend_module_ops *thisAllocator; |
4250 | + int result, returning = 0; |
4251 | + |
4252 | + if (suspend_activate_storage(0)) |
4253 | + return 0; |
4254 | + |
4255 | + suspendActiveAllocator = NULL; |
4256 | + clear_suspend_state(SUSPEND_RESUME_DEVICE_OK); |
4257 | + clear_suspend_state(SUSPEND_CAN_RESUME); |
4258 | + clear_result_state(SUSPEND_ABORTED); |
4259 | + |
4260 | + if (!suspendNumAllocators) { |
4261 | + if (!quiet) |
4262 | + printk("Suspend2: No storage allocators have been " |
4263 | + "registered. Suspending will be disabled.\n"); |
4264 | + goto cleanup; |
4265 | + } |
4266 | + |
4267 | + if (!resume2_file[0]) { |
4268 | + if (!quiet) |
4269 | + printk("Suspend2: Resume2 parameter is empty." |
4270 | + " Suspending will be disabled.\n"); |
4271 | + goto cleanup; |
4272 | + } |
4273 | + |
4274 | + list_for_each(Allocator, &suspendAllocators) { |
4275 | + thisAllocator = list_entry(Allocator, struct suspend_module_ops, |
4276 | + type_list); |
4277 | + |
4278 | + /* |
4279 | + * Not sure why you'd want to disable an allocator, but |
4280 | + * we should honour the flag if we're providing it |
4281 | + */ |
4282 | + if (!thisAllocator->enabled) |
4283 | + continue; |
4284 | + |
4285 | + result = thisAllocator->parse_sig_location( |
4286 | + resume2_file, (suspendNumAllocators == 1), |
4287 | + quiet); |
4288 | + |
4289 | + switch (result) { |
4290 | + case -EINVAL: |
4291 | + /* For this allocator, but not a valid |
4292 | + * configuration. Error already printed. */ |
4293 | + goto cleanup; |
4294 | + |
4295 | + case 0: |
4296 | + /* For this allocator and valid. */ |
4297 | + suspendActiveAllocator = thisAllocator; |
4298 | + |
4299 | + set_suspend_state(SUSPEND_RESUME_DEVICE_OK); |
4300 | + set_suspend_state(SUSPEND_CAN_RESUME); |
4301 | + if (!quiet) |
4302 | + printk("Suspend2: Resuming enabled.\n"); |
4303 | + |
4304 | + returning = 1; |
4305 | + goto cleanup; |
4306 | + } |
4307 | + } |
4308 | + if (!quiet) |
4309 | + printk("Suspend2: No matching enabled allocator found. " |
4310 | + "Resuming disabled.\n"); |
4311 | +cleanup: |
4312 | + suspend_deactivate_storage(0); |
4313 | + return returning; |
4314 | +} |
4315 | + |
4316 | +void attempt_to_parse_resume_device2(void) |
4317 | +{ |
4318 | + suspend_prepare_usm(); |
4319 | + suspend_attempt_to_parse_resume_device(0); |
4320 | + suspend_cleanup_usm(); |
4321 | +} |
4322 | + |
4323 | +void save_restore_resume2(int replace, int quiet) |
4324 | +{ |
4325 | + static char resume2_save[255]; |
4326 | + static unsigned long suspend_state_save; |
4327 | + |
4328 | + if (replace) { |
4329 | + suspend_state_save = suspend_state; |
4330 | + strcpy(resume2_save, resume2_file); |
4331 | + strcpy(resume2_file, poweroff_resume2); |
4332 | + } else { |
4333 | + strcpy(resume2_file, resume2_save); |
4334 | + suspend_state = suspend_state_save; |
4335 | + } |
4336 | + suspend_attempt_to_parse_resume_device(quiet); |
4337 | +} |
4338 | + |
4339 | +void attempt_to_parse_po_resume_device2(void) |
4340 | +{ |
4341 | + int ok = 0; |
4342 | + |
4343 | + /* Temporarily set resume2 to the poweroff value */ |
4344 | + if (!strlen(poweroff_resume2)) |
4345 | + return; |
4346 | + |
4347 | + printk("=== Trying Poweroff Resume2 ===\n"); |
4348 | + save_restore_resume2(SAVE, NOQUIET); |
4349 | + if (test_suspend_state(SUSPEND_CAN_RESUME)) |
4350 | + ok = 1; |
4351 | + |
4352 | + printk("=== Done ===\n"); |
4353 | + save_restore_resume2(RESTORE, QUIET); |
4354 | + |
4355 | + /* If not ok, clear the string */ |
4356 | + if (ok) |
4357 | + return; |
4358 | + |
4359 | + printk("Can't resume from that location; clearing poweroff_resume2.\n"); |
4360 | + poweroff_resume2[0] = '\0'; |
4361 | +} |
4362 | + |
4363 | +/* noresume_reset_modules |
4364 | + * |
4365 | + * Description: When we read the start of an image, modules (and especially the |
4366 | + * active allocator) might need to reset data structures if we |
4367 | + * decide to invalidate the image rather than resuming from it. |
4368 | + */ |
4369 | + |
4370 | +static void noresume_reset_modules(void) |
4371 | +{ |
4372 | + struct suspend_module_ops *this_filter; |
4373 | + |
4374 | + list_for_each_entry(this_filter, &suspend_filters, type_list) |
4375 | + if (this_filter->noresume_reset) |
4376 | + this_filter->noresume_reset(); |
4377 | + |
4378 | + if (suspendActiveAllocator && suspendActiveAllocator->noresume_reset) |
4379 | + suspendActiveAllocator->noresume_reset(); |
4380 | +} |
4381 | + |
4382 | +/* fill_suspend_header() |
4383 | + * |
4384 | + * Description: Fill the suspend header structure. |
4385 | + * Arguments: struct suspend_header: Header data structure to be filled. |
4386 | + */ |
4387 | + |
4388 | +static void fill_suspend_header(struct suspend_header *sh) |
4389 | +{ |
4390 | + int i; |
4391 | + |
4392 | + memset((char *)sh, 0, sizeof(*sh)); |
4393 | + |
4394 | + sh->version_code = LINUX_VERSION_CODE; |
4395 | + sh->num_physpages = num_physpages; |
4396 | + memcpy(&sh->uts, init_utsname(), sizeof(struct new_utsname)); |
4397 | + sh->page_size = PAGE_SIZE; |
4398 | + sh->pagedir = pagedir1; |
4399 | + sh->pageset_2_size = pagedir2.size; |
4400 | + sh->param0 = suspend_result; |
4401 | + sh->param1 = suspend_action; |
4402 | + sh->param2 = suspend_debug_state; |
4403 | + sh->param3 = console_loglevel; |
4404 | + sh->root_fs = current->fs->rootmnt->mnt_sb->s_dev; |
4405 | + for (i = 0; i < 4; i++) |
4406 | + sh->io_time[i/2][i%2] = suspend_io_time[i/2][i%2]; |
4407 | +} |
4408 | + |
4409 | +/* |
4410 | + * rw_init_modules |
4411 | + * |
4412 | + * Iterate over modules, preparing the ones that will be used to read or write |
4413 | + * data. |
4414 | + */ |
4415 | +static int rw_init_modules(int rw, int which) |
4416 | +{ |
4417 | + struct suspend_module_ops *this_module; |
4418 | + /* Initialise page transformers */ |
4419 | + list_for_each_entry(this_module, &suspend_filters, type_list) { |
4420 | + if (!this_module->enabled) |
4421 | + continue; |
4422 | + if (this_module->rw_init && this_module->rw_init(rw, which)) { |
4423 | + abort_suspend(SUSPEND_FAILED_MODULE_INIT, |
4424 | + "Failed to initialise the %s filter.", |
4425 | + this_module->name); |
4426 | + return 1; |
4427 | + } |
4428 | + } |
4429 | + |
4430 | + /* Initialise allocator */ |
4431 | + if (suspendActiveAllocator->rw_init(rw, which)) { |
4432 | + abort_suspend(SUSPEND_FAILED_MODULE_INIT, |
4433 | + "Failed to initialise the allocator."); |
4434 | + if (!rw) |
4435 | + suspendActiveAllocator->invalidate_image(); |
4436 | + return 1; |
4437 | + } |
4438 | + |
4439 | + /* Initialise other modules */ |
4440 | + list_for_each_entry(this_module, &suspend_modules, module_list) { |
4441 | + if (!this_module->enabled || |
4442 | + this_module->type == FILTER_MODULE || |
4443 | + this_module->type == WRITER_MODULE) |
4444 | + continue; |
4445 | + if (this_module->rw_init && this_module->rw_init(rw, which)) { |
4446 | + set_result_state(SUSPEND_ABORTED); |
4447 | + printk("Setting aborted flag due to module init failure.\n"); |
4448 | + return 1; |
4449 | + } |
4450 | + } |
4451 | + |
4452 | + return 0; |
4453 | +} |
4454 | + |
4455 | +/* |
4456 | + * rw_cleanup_modules |
4457 | + * |
4458 | + * Cleanup components after reading or writing a set of pages. |
4459 | + * Only the allocator may fail. |
4460 | + */ |
4461 | +static int rw_cleanup_modules(int rw) |
4462 | +{ |
4463 | + struct suspend_module_ops *this_module; |
4464 | + int result = 0; |
4465 | + |
4466 | + /* Cleanup other modules */ |
4467 | + list_for_each_entry(this_module, &suspend_modules, module_list) { |
4468 | + if (!this_module->enabled || |
4469 | + this_module->type == FILTER_MODULE || |
4470 | + this_module->type == WRITER_MODULE) |
4471 | + continue; |
4472 | + if (this_module->rw_cleanup) |
4473 | + result |= this_module->rw_cleanup(rw); |
4474 | + } |
4475 | + |
4476 | + /* Flush data and cleanup */ |
4477 | + list_for_each_entry(this_module, &suspend_filters, type_list) { |
4478 | + if (!this_module->enabled) |
4479 | + continue; |
4480 | + if (this_module->rw_cleanup) |
4481 | + result |= this_module->rw_cleanup(rw); |
4482 | + } |
4483 | + |
4484 | + result |= suspendActiveAllocator->rw_cleanup(rw); |
4485 | + |
4486 | + return result; |
4487 | +} |
4488 | + |
4489 | +static struct page *copy_page_from_orig_page(struct page *orig_page) |
4490 | +{ |
4491 | + int is_high = PageHighMem(orig_page), index, min, max; |
4492 | + struct page *high_page = NULL, |
4493 | + **my_last_high_page = &__get_cpu_var(last_high_page), |
4494 | + **my_last_sought = &__get_cpu_var(last_sought); |
4495 | + struct pbe *this, **my_last_low_page = &__get_cpu_var(last_low_page); |
4496 | + void *compare; |
4497 | + |
4498 | + if (is_high) { |
4499 | + if (*my_last_sought && *my_last_high_page && *my_last_sought < orig_page) |
4500 | + high_page = *my_last_high_page; |
4501 | + else |
4502 | + high_page = (struct page *) restore_highmem_pblist; |
4503 | + this = (struct pbe *) kmap(high_page); |
4504 | + compare = orig_page; |
4505 | + } else { |
4506 | + if (*my_last_sought && *my_last_low_page && *my_last_sought < orig_page) |
4507 | + this = *my_last_low_page; |
4508 | + else |
4509 | + this = restore_pblist; |
4510 | + compare = page_address(orig_page); |
4511 | + } |
4512 | + |
4513 | + *my_last_sought = orig_page; |
4514 | + |
4515 | + /* Locate page containing pbe */ |
4516 | + while ( this[PBES_PER_PAGE - 1].next && |
4517 | + this[PBES_PER_PAGE - 1].orig_address < compare) { |
4518 | + if (is_high) { |
4519 | + struct page *next_high_page = (struct page *) |
4520 | + this[PBES_PER_PAGE - 1].next; |
4521 | + kunmap(high_page); |
4522 | + this = kmap(next_high_page); |
4523 | + high_page = next_high_page; |
4524 | + } else |
4525 | + this = this[PBES_PER_PAGE - 1].next; |
4526 | + } |
4527 | + |
4528 | + /* Do a binary search within the page */ |
4529 | + min = 0; |
4530 | + max = PBES_PER_PAGE; |
4531 | + index = PBES_PER_PAGE / 2; |
4532 | + while (max - min) { |
4533 | + if (!this[index].orig_address || |
4534 | + this[index].orig_address > compare) |
4535 | + max = index; |
4536 | + else if (this[index].orig_address == compare) { |
4537 | + if (is_high) { |
4538 | + struct page *page = this[index].address; |
4539 | + *my_last_high_page = high_page; |
4540 | + kunmap(high_page); |
4541 | + return page; |
4542 | + } |
4543 | + *my_last_low_page = this; |
4544 | + return virt_to_page(this[index].address); |
4545 | + } else |
4546 | + min = index; |
4547 | + index = ((max + min) / 2); |
4548 | + }; |
4549 | + |
4550 | + if (is_high) |
4551 | + kunmap(high_page); |
4552 | + |
4553 | + abort_suspend(SUSPEND_FAILED_IO, "Failed to get destination page for" |
4554 | + " orig page %p. This[min].orig_address=%p.\n", orig_page, |
4555 | + this[index].orig_address); |
4556 | + return NULL; |
4557 | +} |
4558 | + |
4559 | +/* |
4560 | + * do_rw_loop |
4561 | + * |
4562 | + * The main I/O loop for reading or writing pages. |
4563 | + */ |
4564 | +static int worker_rw_loop(void *data) |
4565 | +{ |
4566 | + unsigned long orig_pfn, write_pfn; |
4567 | + int result, my_io_index = 0; |
4568 | + struct suspend_module_ops *first_filter = suspend_get_next_filter(NULL); |
4569 | + struct page *buffer = alloc_page(GFP_ATOMIC); |
4570 | + |
4571 | + atomic_inc(&worker_thread_count); |
4572 | + |
4573 | + mutex_lock(&io_mutex); |
4574 | + |
4575 | + do { |
4576 | + int buf_size; |
4577 | + |
4578 | + /* |
4579 | + * What page to use? If reading, don't know yet which page's |
4580 | + * data will be read, so always use the buffer. If writing, |
4581 | + * use the copy (Pageset1) or original page (Pageset2), but |
4582 | + * always write the pfn of the original page. |
4583 | + */ |
4584 | + if (io_write) { |
4585 | + struct page *page; |
4586 | + |
4587 | + pfn = get_next_bit_on(io_map, pfn); |
4588 | + |
4589 | + /* Another thread could have beaten us to it. */ |
4590 | + if (pfn == max_pfn + 1) { |
4591 | + if (atomic_read(&io_count)) { |
4592 | + printk("Ran out of pfns but io_count is still %d.\n", atomic_read(&io_count)); |
4593 | + BUG(); |
4594 | + } |
4595 | + break; |
4596 | + } |
4597 | + |
4598 | + atomic_dec(&io_count); |
4599 | + |
4600 | + orig_pfn = pfn; |
4601 | + write_pfn = pfn; |
4602 | + |
4603 | + /* |
4604 | + * Other_pfn is updated by all threads, so we're not |
4605 | + * writing the same page multiple times. |
4606 | + */ |
4607 | + clear_dynpageflag(&io_map, pfn_to_page(pfn)); |
4608 | + if (io_pageset == 1) { |
4609 | + other_pfn = get_next_bit_on(pageset1_map, other_pfn); |
4610 | + write_pfn = other_pfn; |
4611 | + } |
4612 | + page = pfn_to_page(pfn); |
4613 | + |
4614 | + my_io_index = io_finish_at - atomic_read(&io_count); |
4615 | + |
4616 | + mutex_unlock(&io_mutex); |
4617 | + |
4618 | + result = first_filter->write_chunk(write_pfn, page, |
4619 | + PAGE_SIZE); |
4620 | + } else { |
4621 | + atomic_dec(&io_count); |
4622 | + mutex_unlock(&io_mutex); |
4623 | + |
4624 | + /* |
4625 | + * Are we aborting? If so, don't submit any more I/O as |
4626 | + * resetting the resume_attempted flag (from ui.c) will |
4627 | + * clear the bdev flags, making this thread oops. |
4628 | + */ |
4629 | + if (unlikely(test_suspend_state(SUSPEND_STOP_RESUME))) { |
4630 | + atomic_dec(&worker_thread_count); |
4631 | + if (!atomic_read(&worker_thread_count)) |
4632 | + set_suspend_state(SUSPEND_IO_STOPPED); |
4633 | + while (1) |
4634 | + schedule(); |
4635 | + } |
4636 | + |
4637 | + result = first_filter->read_chunk(&write_pfn, buffer, |
4638 | + &buf_size, SUSPEND_ASYNC); |
4639 | + if (buf_size != PAGE_SIZE) { |
4640 | + abort_suspend(SUSPEND_FAILED_IO, |
4641 | + "I/O pipeline returned %d bytes instead " |
4642 | + "of %d.\n", buf_size, PAGE_SIZE); |
4643 | + mutex_lock(&io_mutex); |
4644 | + break; |
4645 | + } |
4646 | + } |
4647 | + |
4648 | + if (result) { |
4649 | + io_result = result; |
4650 | + if (io_write) { |
4651 | + printk("Write chunk returned %d.\n", result); |
4652 | + abort_suspend(SUSPEND_FAILED_IO, |
4653 | + "Failed to write a chunk of the " |
4654 | + "image."); |
4655 | + mutex_lock(&io_mutex); |
4656 | + break; |
4657 | + } |
4658 | + panic("Read chunk returned (%d)", result); |
4659 | + } |
4660 | + |
4661 | + /* |
4662 | + * Discard reads of resaved pages while reading ps2 |
4663 | + * and unwanted pages while rereading ps2 when aborting. |
4664 | + */ |
4665 | + if (!io_write && !PageResave(pfn_to_page(write_pfn))) { |
4666 | + struct page *final_page = pfn_to_page(write_pfn), |
4667 | + *copy_page = final_page; |
4668 | + char *virt, *buffer_virt; |
4669 | + |
4670 | + if (io_pageset == 1 && !load_direct(final_page)) { |
4671 | + copy_page = copy_page_from_orig_page(final_page); |
4672 | + BUG_ON(!copy_page); |
4673 | + } |
4674 | + |
4675 | + if (test_dynpageflag(&io_map, final_page)) { |
4676 | + virt = kmap(copy_page); |
4677 | + buffer_virt = kmap(buffer); |
4678 | + memcpy(virt, buffer_virt, PAGE_SIZE); |
4679 | + kunmap(copy_page); |
4680 | + kunmap(buffer); |
4681 | + clear_dynpageflag(&io_map, final_page); |
4682 | + mutex_lock(&io_mutex); |
4683 | + my_io_index = io_finish_at - atomic_read(&io_count); |
4684 | + mutex_unlock(&io_mutex); |
4685 | + } else { |
4686 | + mutex_lock(&io_mutex); |
4687 | + atomic_inc(&io_count); |
4688 | + mutex_unlock(&io_mutex); |
4689 | + } |
4690 | + } |
4691 | + |
4692 | + /* Strictly speaking, this is racy - another thread could |
4693 | + * output the next the next percentage before we've done |
4694 | + * ours. 1/5th of the pageset would have to be done first, |
4695 | + * though, so I'm not worried. In addition, the only impact |
4696 | + * would be messed up output, not image corruption. Doing |
4697 | + * this under the mutex seems an unnecessary slowdown. |
4698 | + */ |
4699 | + if ((my_io_index + io_base) >= io_nextupdate) |
4700 | + io_nextupdate = suspend_update_status(my_io_index + |
4701 | + io_base, io_barmax, " %d/%d MB ", |
4702 | + MB(io_base+my_io_index+1), MB(io_barmax)); |
4703 | + |
4704 | + if ((my_io_index + 1) == io_pc) { |
4705 | + printk("%d%%...", 20 * io_pc_step); |
4706 | + io_pc_step++; |
4707 | + io_pc = io_finish_at * io_pc_step / 5; |
4708 | + } |
4709 | + |
4710 | + suspend_cond_pause(0, NULL); |
4711 | + |
4712 | + /* |
4713 | + * Subtle: If there's less I/O still to be done than threads |
4714 | + * running, quit. This stops us doing I/O beyond the end of |
4715 | + * the image when reading. |
4716 | + * |
4717 | + * Possible race condition. Two threads could do the test at |
4718 | + * the same time; one should exit and one should continue. |
4719 | + * Therefore we take the mutex before comparing and exiting. |
4720 | + */ |
4721 | + |
4722 | + mutex_lock(&io_mutex); |
4723 | + |
4724 | + } while(atomic_read(&io_count) >= atomic_read(&worker_thread_count) && |
4725 | + !(io_write && test_result_state(SUSPEND_ABORTED))); |
4726 | + |
4727 | + atomic_dec(&worker_thread_count); |
4728 | + mutex_unlock(&io_mutex); |
4729 | + |
4730 | + __free_pages(buffer, 0); |
4731 | + |
4732 | + return 0; |
4733 | +} |
4734 | + |
4735 | +void start_other_threads(void) |
4736 | +{ |
4737 | + int cpu; |
4738 | + struct task_struct *p; |
4739 | + |
4740 | + for_each_online_cpu(cpu) { |
4741 | + if (cpu == smp_processor_id()) |
4742 | + continue; |
4743 | + |
4744 | + p = kthread_create(worker_rw_loop, NULL, "ks2io/%d", cpu); |
4745 | + if (IS_ERR(p)) { |
4746 | + printk("ks2io for %i failed\n", cpu); |
4747 | + continue; |
4748 | + } |
4749 | + kthread_bind(p, cpu); |
4750 | + wake_up_process(p); |
4751 | + } |
4752 | +} |
4753 | + |
4754 | +/* |
4755 | + * do_rw_loop |
4756 | + * |
4757 | + * The main I/O loop for reading or writing pages. |
4758 | + */ |
4759 | +static int do_rw_loop(int write, int finish_at, dyn_pageflags_t *pageflags, |
4760 | + int base, int barmax, int pageset) |
4761 | +{ |
4762 | + int index = 0, cpu; |
4763 | + |
4764 | + if (!finish_at) |
4765 | + return 0; |
4766 | + |
4767 | + io_write = write; |
4768 | + io_finish_at = finish_at; |
4769 | + io_base = base; |
4770 | + io_barmax = barmax; |
4771 | + io_pageset = pageset; |
4772 | + io_index = 0; |
4773 | + io_pc = io_finish_at / 5; |
4774 | + io_pc_step = 1; |
4775 | + io_result = 0; |
4776 | + io_nextupdate = 0; |
4777 | + |
4778 | + for_each_online_cpu(cpu) { |
4779 | + per_cpu(last_sought, cpu) = NULL; |
4780 | + per_cpu(last_low_page, cpu) = NULL; |
4781 | + per_cpu(last_high_page, cpu) = NULL; |
4782 | + } |
4783 | + |
4784 | + /* Ensure all bits clear */ |
4785 | + pfn = get_next_bit_on(io_map, max_pfn + 1); |
4786 | + |
4787 | + while (pfn < max_pfn + 1) { |
4788 | + clear_dynpageflag(&io_map, pfn_to_page(pfn)); |
4789 | + pfn = get_next_bit_on(io_map, pfn); |
4790 | + } |
4791 | + |
4792 | + /* Set the bits for the pages to write */ |
4793 | + pfn = get_next_bit_on(*pageflags, max_pfn + 1); |
4794 | + |
4795 | + while (pfn < max_pfn + 1 && index < finish_at) { |
4796 | + set_dynpageflag(&io_map, pfn_to_page(pfn)); |
4797 | + pfn = get_next_bit_on(*pageflags, pfn); |
4798 | + index++; |
4799 | + } |
4800 | + |
4801 | + BUG_ON(index < finish_at); |
4802 | + |
4803 | + atomic_set(&io_count, finish_at); |
4804 | + |
4805 | + pfn = max_pfn + 1; |
4806 | + other_pfn = pfn; |
4807 | + |
4808 | + clear_suspend_state(SUSPEND_IO_STOPPED); |
4809 | + |
4810 | + if (!test_action_state(SUSPEND_NO_MULTITHREADED_IO)) |
4811 | + start_other_threads(); |
4812 | + worker_rw_loop(NULL); |
4813 | + |
4814 | + while (atomic_read(&worker_thread_count)) |
4815 | + schedule(); |
4816 | + |
4817 | + set_suspend_state(SUSPEND_IO_STOPPED); |
4818 | + if (unlikely(test_suspend_state(SUSPEND_STOP_RESUME))) { |
4819 | + while (1) |
4820 | + schedule(); |
4821 | + } |
4822 | + |
4823 | + if (!io_result) { |
4824 | + printk("done.\n"); |
4825 | + |
4826 | + suspend_update_status(io_base + io_finish_at, io_barmax, " %d/%d MB ", |
4827 | + MB(io_base + io_finish_at), MB(io_barmax)); |
4828 | + } |
4829 | + |
4830 | + if (io_write && test_result_state(SUSPEND_ABORTED)) |
4831 | + io_result = 1; |
4832 | + else /* All I/O done? */ |
4833 | + BUG_ON(get_next_bit_on(io_map, max_pfn + 1) != max_pfn + 1); |
4834 | + |
4835 | + return io_result; |
4836 | +} |
4837 | + |
4838 | +/* write_pageset() |
4839 | + * |
4840 | + * Description: Write a pageset to disk. |
4841 | + * Arguments: pagedir: Which pagedir to write.. |
4842 | + * Returns: Zero on success or -1 on failure. |
4843 | + */ |
4844 | + |
4845 | +int write_pageset(struct pagedir *pagedir) |
4846 | +{ |
4847 | + int finish_at, base = 0, start_time, end_time; |
4848 | + int barmax = pagedir1.size + pagedir2.size; |
4849 | + long error = 0; |
4850 | + dyn_pageflags_t *pageflags; |
4851 | + |
4852 | + /* |
4853 | + * Even if there is nothing to read or write, the allocator |
4854 | + * may need the init/cleanup for it's housekeeping. (eg: |
4855 | + * Pageset1 may start where pageset2 ends when writing). |
4856 | + */ |
4857 | + finish_at = pagedir->size; |
4858 | + |
4859 | + if (pagedir->id == 1) { |
4860 | + suspend_prepare_status(DONT_CLEAR_BAR, |
4861 | + "Writing kernel & process data..."); |
4862 | + base = pagedir2.size; |
4863 | + if (test_action_state(SUSPEND_TEST_FILTER_SPEED) || |
4864 | + test_action_state(SUSPEND_TEST_BIO)) |
4865 | + pageflags = &pageset1_map; |
4866 | + else |
4867 | + pageflags = &pageset1_copy_map; |
4868 | + } else { |
4869 | + suspend_prepare_status(CLEAR_BAR, "Writing caches..."); |
4870 | + pageflags = &pageset2_map; |
4871 | + } |
4872 | + |
4873 | + start_time = jiffies; |
4874 | + |
4875 | + if (rw_init_modules(1, pagedir->id)) { |
4876 | + abort_suspend(SUSPEND_FAILED_MODULE_INIT, |
4877 | + "Failed to initialise modules for writing."); |
4878 | + error = 1; |
4879 | + } |
4880 | + |
4881 | + if (!error) |
4882 | + error = do_rw_loop(1, finish_at, pageflags, base, barmax, |
4883 | + pagedir->id); |
4884 | + |
4885 | + if (rw_cleanup_modules(WRITE) && !error) { |
4886 | + abort_suspend(SUSPEND_FAILED_MODULE_CLEANUP, |
4887 | + "Failed to cleanup after writing."); |
4888 | + error = 1; |
4889 | + } |
4890 | + |
4891 | + end_time = jiffies; |
4892 | + |
4893 | + if ((end_time - start_time) && (!test_result_state(SUSPEND_ABORTED))) { |
4894 | + suspend_io_time[0][0] += finish_at, |
4895 | + suspend_io_time[0][1] += (end_time - start_time); |
4896 | + } |
4897 | + |
4898 | + return error; |
4899 | +} |
4900 | + |
4901 | +/* read_pageset() |
4902 | + * |
4903 | + * Description: Read a pageset from disk. |
4904 | + * Arguments: whichtowrite: Controls what debugging output is printed. |
4905 | + * overwrittenpagesonly: Whether to read the whole pageset or |
4906 | + * only part. |
4907 | + * Returns: Zero on success or -1 on failure. |
4908 | + */ |
4909 | + |
4910 | +static int read_pageset(struct pagedir *pagedir, int overwrittenpagesonly) |
4911 | +{ |
4912 | + int result = 0, base = 0, start_time, end_time; |
4913 | + int finish_at = pagedir->size; |
4914 | + int barmax = pagedir1.size + pagedir2.size; |
4915 | + dyn_pageflags_t *pageflags; |
4916 | + |
4917 | + if (pagedir->id == 1) { |
4918 | + suspend_prepare_status(CLEAR_BAR, |
4919 | + "Reading kernel & process data..."); |
4920 | + pageflags = &pageset1_map; |
4921 | + } else { |
4922 | + suspend_prepare_status(DONT_CLEAR_BAR, "Reading caches..."); |
4923 | + if (overwrittenpagesonly) |
4924 | + barmax = finish_at = min(pagedir1.size, |
4925 | + pagedir2.size); |
4926 | + else { |
4927 | + base = pagedir1.size; |
4928 | + } |
4929 | + pageflags = &pageset2_map; |
4930 | + } |
4931 | + |
4932 | + start_time = jiffies; |
4933 | + |
4934 | + if (rw_init_modules(0, pagedir->id)) { |
4935 | + suspendActiveAllocator->invalidate_image(); |
4936 | + result = 1; |
4937 | + } else |
4938 | + result = do_rw_loop(0, finish_at, pageflags, base, barmax, |
4939 | + pagedir->id); |
4940 | + |
4941 | + if (rw_cleanup_modules(READ) && !result) { |
4942 | + abort_suspend(SUSPEND_FAILED_MODULE_CLEANUP, |
4943 | + "Failed to cleanup after reading."); |
4944 | + result = 1; |
4945 | + } |
4946 | + |
4947 | + /* Statistics */ |
4948 | + end_time=jiffies; |
4949 | + |
4950 | + if ((end_time - start_time) && (!test_result_state(SUSPEND_ABORTED))) { |
4951 | + suspend_io_time[1][0] += finish_at, |
4952 | + suspend_io_time[1][1] += (end_time - start_time); |
4953 | + } |
4954 | + |
4955 | + return result; |
4956 | +} |
4957 | + |
4958 | +/* write_module_configs() |
4959 | + * |
4960 | + * Description: Store the configuration for each module in the image header. |
4961 | + * Returns: Int: Zero on success, Error value otherwise. |
4962 | + */ |
4963 | +static int write_module_configs(void) |
4964 | +{ |
4965 | + struct suspend_module_ops *this_module; |
4966 | + char *buffer = (char *) get_zeroed_page(GFP_ATOMIC); |
4967 | + int len, index = 1; |
4968 | + struct suspend_module_header suspend_module_header; |
4969 | + |
4970 | + if (!buffer) { |
4971 | + printk("Failed to allocate a buffer for saving " |
4972 | + "module configuration info.\n"); |
4973 | + return -ENOMEM; |
4974 | + } |
4975 | + |
4976 | + /* |
4977 | + * We have to know which data goes with which module, so we at |
4978 | + * least write a length of zero for a module. Note that we are |
4979 | + * also assuming every module's config data takes <= PAGE_SIZE. |
4980 | + */ |
4981 | + |
4982 | + /* For each module (in registration order) */ |
4983 | + list_for_each_entry(this_module, &suspend_modules, module_list) { |
4984 | + if (!this_module->enabled || !this_module->storage_needed || |
4985 | + (this_module->type == WRITER_MODULE && |
4986 | + suspendActiveAllocator != this_module)) |
4987 | + continue; |
4988 | + |
4989 | + /* Get the data from the module */ |
4990 | + len = 0; |
4991 | + if (this_module->save_config_info) |
4992 | + len = this_module->save_config_info(buffer); |
4993 | + |
4994 | + /* Save the details of the module */ |
4995 | + suspend_module_header.enabled = this_module->enabled; |
4996 | + suspend_module_header.type = this_module->type; |
4997 | + suspend_module_header.index = index++; |
4998 | + strncpy(suspend_module_header.name, this_module->name, |
4999 | + sizeof(suspend_module_header.name)); |
5000 | + suspendActiveAllocator->rw_header_chunk(WRITE, |
5001 | + this_module, |
5002 | + (char *) &suspend_module_header, |
5003 | + sizeof(suspend_module_header)); |
5004 | + |
5005 | + /* Save the size of the data and any data returned */ |
5006 | + suspendActiveAllocator->rw_header_chunk(WRITE, |
5007 | + this_module, |
5008 | + (char *) &len, sizeof(int)); |
5009 | + if (len) |
5010 | + suspendActiveAllocator->rw_header_chunk( |
5011 | + WRITE, this_module, buffer, len); |
5012 | + } |
5013 | + |
5014 | + /* Write a blank header to terminate the list */ |
5015 | + suspend_module_header.name[0] = '\0'; |
5016 | + suspendActiveAllocator->rw_header_chunk(WRITE, |
5017 | + NULL, |
5018 | + (char *) &suspend_module_header, |
5019 | + sizeof(suspend_module_header)); |
5020 | + |
5021 | + free_page((unsigned long) buffer); |
5022 | + return 0; |
5023 | +} |
5024 | + |
5025 | +/* read_module_configs() |
5026 | + * |
5027 | + * Description: Reload module configurations from the image header. |
5028 | + * Returns: Int. Zero on success, error value otherwise. |
5029 | + */ |
5030 | + |
5031 | +static int read_module_configs(void) |
5032 | +{ |
5033 | + struct suspend_module_ops *this_module; |
5034 | + char *buffer = (char *) get_zeroed_page(GFP_ATOMIC); |
5035 | + int len, result = 0; |
5036 | + struct suspend_module_header suspend_module_header; |
5037 | + |
5038 | + if (!buffer) { |
5039 | + printk("Failed to allocate a buffer for reloading module " |
5040 | + "configuration info.\n"); |
5041 | + return -ENOMEM; |
5042 | + } |
5043 | + |
5044 | + /* All modules are initially disabled. That way, if we have a module |
5045 | + * loaded now that wasn't loaded when we suspended, it won't be used |
5046 | + * in trying to read the data. |
5047 | + */ |
5048 | + list_for_each_entry(this_module, &suspend_modules, module_list) |
5049 | + this_module->enabled = 0; |
5050 | + |
5051 | + /* Get the first module header */ |
5052 | + result = suspendActiveAllocator->rw_header_chunk(READ, NULL, |
5053 | + (char *) &suspend_module_header, |
5054 | + sizeof(suspend_module_header)); |
5055 | + if (result) { |
5056 | + printk("Failed to read the next module header.\n"); |
5057 | + free_page((unsigned long) buffer); |
5058 | + return -EINVAL; |
5059 | + } |
5060 | + |
5061 | + /* For each module (in registration order) */ |
5062 | + while (suspend_module_header.name[0]) { |
5063 | + |
5064 | + /* Find the module */ |
5065 | + this_module = suspend_find_module_given_name(suspend_module_header.name); |
5066 | + |
5067 | + if (!this_module) { |
5068 | + /* |
5069 | + * Is it used? Only need to worry about filters. The active |
5070 | + * allocator must be loaded! |
5071 | + */ |
5072 | + if (suspend_module_header.enabled) { |
5073 | + suspend_early_boot_message(1, SUSPEND_CONTINUE_REQ, |
5074 | + "It looks like we need module %s for " |
5075 | + "reading the image but it hasn't been " |
5076 | + "registered.\n", |
5077 | + suspend_module_header.name); |
5078 | + if (!(test_suspend_state(SUSPEND_CONTINUE_REQ))) { |
5079 | + suspendActiveAllocator->invalidate_image(); |
5080 | + free_page((unsigned long) buffer); |
5081 | + return -EINVAL; |
5082 | + } |
5083 | + } else |
5084 | + printk("Module %s configuration data found, but" |
5085 | + " the module hasn't registered. Looks " |
5086 | + "like it was disabled, so we're " |
5087 | + "ignoring it's data.", |
5088 | + suspend_module_header.name); |
5089 | + } |
5090 | + |
5091 | + /* Get the length of the data (if any) */ |
5092 | + result = suspendActiveAllocator->rw_header_chunk(READ, NULL, |
5093 | + (char *) &len, sizeof(int)); |
5094 | + if (result) { |
5095 | + printk("Failed to read the length of the module %s's" |
5096 | + " configuration data.\n", |
5097 | + suspend_module_header.name); |
5098 | + free_page((unsigned long) buffer); |
5099 | + return -EINVAL; |
5100 | + } |
5101 | + |
5102 | + /* Read any data and pass to the module (if we found one) */ |
5103 | + if (len) { |
5104 | + suspendActiveAllocator->rw_header_chunk(READ, NULL, |
5105 | + buffer, len); |
5106 | + if (this_module) { |
5107 | + if (!this_module->save_config_info) { |
5108 | + printk("Huh? Module %s appears to have " |
5109 | + "a save_config_info, but not a " |
5110 | + "load_config_info function!\n", |
5111 | + this_module->name); |
5112 | + } else |
5113 | + this_module->load_config_info(buffer, len); |
5114 | + } |
5115 | + } |
5116 | + |
5117 | + if (this_module) { |
5118 | + /* Now move this module to the tail of its lists. This |
5119 | + * will put it in order. Any new modules will end up at |
5120 | + * the top of the lists. They should have been set to |
5121 | + * disabled when loaded (people will normally not edit |
5122 | + * an initrd to load a new module and then suspend |
5123 | + * without using it!). |
5124 | + */ |
5125 | + |
5126 | + suspend_move_module_tail(this_module); |
5127 | + |
5128 | + /* |
5129 | + * We apply the disabled state; modules don't need to |
5130 | + * save whether they were disabled and if they do, we |
5131 | + * override them anyway. |
5132 | + */ |
5133 | + this_module->enabled = suspend_module_header.enabled; |
5134 | + } |
5135 | + |
5136 | + /* Get the next module header */ |
5137 | + result = suspendActiveAllocator->rw_header_chunk(READ, NULL, |
5138 | + (char *) &suspend_module_header, |
5139 | + sizeof(suspend_module_header)); |
5140 | + |
5141 | + if (result) { |
5142 | + printk("Failed to read the next module header.\n"); |
5143 | + free_page((unsigned long) buffer); |
5144 | + return -EINVAL; |
5145 | + } |
5146 | + |
5147 | + } |
5148 | + |
5149 | + free_page((unsigned long) buffer); |
5150 | + return 0; |
5151 | +} |
5152 | + |
5153 | +/* write_image_header() |
5154 | + * |
5155 | + * Description: Write the image header after write the image proper. |
5156 | + * Returns: Int. Zero on success or -1 on failure. |
5157 | + */ |
5158 | + |
5159 | +int write_image_header(void) |
5160 | +{ |
5161 | + int ret; |
5162 | + int total = pagedir1.size + pagedir2.size+2; |
5163 | + char *header_buffer = NULL; |
5164 | + |
5165 | + /* Now prepare to write the header */ |
5166 | + if ((ret = suspendActiveAllocator->write_header_init())) { |
5167 | + abort_suspend(SUSPEND_FAILED_MODULE_INIT, |
5168 | + "Active allocator's write_header_init" |
5169 | + " function failed."); |
5170 | + goto write_image_header_abort; |
5171 | + } |
5172 | + |
5173 | + /* Get a buffer */ |
5174 | + header_buffer = (char *) get_zeroed_page(GFP_ATOMIC); |
5175 | + if (!header_buffer) { |
5176 | + abort_suspend(SUSPEND_OUT_OF_MEMORY, |
5177 | + "Out of memory when trying to get page for header!"); |
5178 | + goto write_image_header_abort; |
5179 | + } |
5180 | + |
5181 | + /* Write suspend header */ |
5182 | + fill_suspend_header((struct suspend_header *) header_buffer); |
5183 | + suspendActiveAllocator->rw_header_chunk(WRITE, NULL, |
5184 | + header_buffer, sizeof(struct suspend_header)); |
5185 | + |
5186 | + free_page((unsigned long) header_buffer); |
5187 | + |
5188 | + /* Write module configurations */ |
5189 | + if ((ret = write_module_configs())) { |
5190 | + abort_suspend(SUSPEND_FAILED_IO, |
5191 | + "Failed to write module configs."); |
5192 | + goto write_image_header_abort; |
5193 | + } |
5194 | + |
5195 | + save_dyn_pageflags(pageset1_map); |
5196 | + |
5197 | + /* Flush data and let allocator cleanup */ |
5198 | + if (suspendActiveAllocator->write_header_cleanup()) { |
5199 | + abort_suspend(SUSPEND_FAILED_IO, |
5200 | + "Failed to cleanup writing header."); |
5201 | + goto write_image_header_abort_no_cleanup; |
5202 | + } |
5203 | + |
5204 | + if (test_result_state(SUSPEND_ABORTED)) |
5205 | + goto write_image_header_abort_no_cleanup; |
5206 | + |
5207 | + suspend_message(SUSPEND_IO, SUSPEND_VERBOSE, 1, "|\n"); |
5208 | + suspend_update_status(total, total, NULL); |
5209 | + |
5210 | + return 0; |
5211 | + |
5212 | +write_image_header_abort: |
5213 | + suspendActiveAllocator->write_header_cleanup(); |
5214 | +write_image_header_abort_no_cleanup: |
5215 | + return -1; |
5216 | +} |
5217 | + |
5218 | +/* sanity_check() |
5219 | + * |
5220 | + * Description: Perform a few checks, seeking to ensure that the kernel being |
5221 | + * booted matches the one suspended. They need to match so we can |
5222 | + * be _sure_ things will work. It is not absolutely impossible for |
5223 | + * resuming from a different kernel to work, just not assured. |
5224 | + * Arguments: Struct suspend_header. The header which was saved at suspend |
5225 | + * time. |
5226 | + */ |
5227 | +static char *sanity_check(struct suspend_header *sh) |
5228 | +{ |
5229 | + if (sh->version_code != LINUX_VERSION_CODE) |
5230 | + return "Incorrect kernel version."; |
5231 | + |
5232 | + if (sh->num_physpages != num_physpages) |
5233 | + return "Incorrect memory size."; |
5234 | + |
5235 | + if (strncmp(sh->uts.sysname, init_utsname()->sysname, 65)) |
5236 | + return "Incorrect system type."; |
5237 | + |
5238 | + if (strncmp(sh->uts.release, init_utsname()->release, 65)) |
5239 | + return "Incorrect release."; |
5240 | + |
5241 | + if (strncmp(sh->uts.version, init_utsname()->version, 65)) |
5242 | + return "Right kernel version but wrong build number."; |
5243 | + |
5244 | + if (strncmp(sh->uts.machine, init_utsname()->machine, 65)) |
5245 | + return "Incorrect machine type."; |
5246 | + |
5247 | + if (sh->page_size != PAGE_SIZE) |
5248 | + return "Incorrect PAGE_SIZE."; |
5249 | + |
5250 | + if (!test_action_state(SUSPEND_IGNORE_ROOTFS)) { |
5251 | + const struct super_block *sb; |
5252 | + list_for_each_entry(sb, &super_blocks, s_list) { |
5253 | + if ((!(sb->s_flags & MS_RDONLY)) && |
5254 | + (sb->s_type->fs_flags & FS_REQUIRES_DEV)) |
5255 | + return "Device backed fs has been mounted " |
5256 | + "rw prior to resume or initrd/ramfs " |
5257 | + "is mounted rw."; |
5258 | + } |
5259 | + } |
5260 | + |
5261 | + return 0; |
5262 | +} |
5263 | + |
5264 | +/* __read_pageset1 |
5265 | + * |
5266 | + * Description: Test for the existence of an image and attempt to load it. |
5267 | + * Returns: Int. Zero if image found and pageset1 successfully loaded. |
5268 | + * Error if no image found or loaded. |
5269 | + */ |
5270 | +static int __read_pageset1(void) |
5271 | +{ |
5272 | + int i, result = 0; |
5273 | + char *header_buffer = (char *) get_zeroed_page(GFP_ATOMIC), |
5274 | + *sanity_error = NULL; |
5275 | + struct suspend_header *suspend_header; |
5276 | + |
5277 | + if (!header_buffer) { |
5278 | + printk("Unable to allocate a page for reading the signature.\n"); |
5279 | + return -ENOMEM; |
5280 | + } |
5281 | + |
5282 | + /* Check for an image */ |
5283 | + if (!(result = suspendActiveAllocator->image_exists())) { |
5284 | + result = -ENODATA; |
5285 | + noresume_reset_modules(); |
5286 | + printk("Suspend2: No image found.\n"); |
5287 | + goto out; |
5288 | + } |
5289 | + |
5290 | + /* Check for noresume command line option */ |
5291 | + if (test_suspend_state(SUSPEND_NORESUME_SPECIFIED)) { |
5292 | + printk("Suspend2: Noresume: Invalidated image.\n"); |
5293 | + goto out_invalidate_image; |
5294 | + } |
5295 | + |
5296 | + /* Check whether we've resumed before */ |
5297 | + if (test_suspend_state(SUSPEND_RESUMED_BEFORE)) { |
5298 | + int resumed_before_default = 0; |
5299 | + if (test_suspend_state(SUSPEND_RETRY_RESUME)) |
5300 | + resumed_before_default = SUSPEND_CONTINUE_REQ; |
5301 | + |
5302 | + suspend_early_boot_message(1, resumed_before_default, NULL); |
5303 | + clear_suspend_state(SUSPEND_RETRY_RESUME); |
5304 | + if (!(test_suspend_state(SUSPEND_CONTINUE_REQ))) { |
5305 | + printk("Suspend2: Tried to resume before: " |
5306 | + "Invalidated image.\n"); |
5307 | + goto out_invalidate_image; |
5308 | + } |
5309 | + } |
5310 | + |
5311 | + clear_suspend_state(SUSPEND_CONTINUE_REQ); |
5312 | + |
5313 | + /* |
5314 | + * Prepare the active allocator for reading the image header. The |
5315 | + * activate allocator might read its own configuration. |
5316 | + * |
5317 | + * NB: This call may never return because there might be a signature |
5318 | + * for a different image such that we warn the user and they choose |
5319 | + * to reboot. (If the device ids look erroneous (2.4 vs 2.6) or the |
5320 | + * location of the image might be unavailable if it was stored on a |
5321 | + * network connection. |
5322 | + */ |
5323 | + |
5324 | + if ((result = suspendActiveAllocator->read_header_init())) { |
5325 | + printk("Suspend2: Failed to initialise, reading the image " |
5326 | + "header.\n"); |
5327 | + goto out_invalidate_image; |
5328 | + } |
5329 | + |
5330 | + /* Read suspend header */ |
5331 | + if ((result = suspendActiveAllocator->rw_header_chunk(READ, NULL, |
5332 | + header_buffer, sizeof(struct suspend_header))) < 0) { |
5333 | + printk("Suspend2: Failed to read the image signature.\n"); |
5334 | + goto out_invalidate_image; |
5335 | + } |
5336 | + |
5337 | + suspend_header = (struct suspend_header *) header_buffer; |
5338 | + |
5339 | + /* |
5340 | + * NB: This call may also result in a reboot rather than returning. |
5341 | + */ |
5342 | + |
5343 | + if ((sanity_error = sanity_check(suspend_header)) && |
5344 | + suspend_early_boot_message(1, SUSPEND_CONTINUE_REQ, sanity_error)) { |
5345 | + printk("Suspend2: Sanity check failed.\n"); |
5346 | + goto out_invalidate_image; |
5347 | + } |
5348 | + |
5349 | + /* |
5350 | + * We have an image and it looks like it will load okay. |
5351 | + * |
5352 | + * Get metadata from header. Don't override commandline parameters. |
5353 | + * |
5354 | + * We don't need to save the image size limit because it's not used |
5355 | + * during resume and will be restored with the image anyway. |
5356 | + */ |
5357 | + |
5358 | + memcpy((char *) &pagedir1, |
5359 | + (char *) &suspend_header->pagedir, sizeof(pagedir1)); |
5360 | + suspend_result = suspend_header->param0; |
5361 | + suspend_action = suspend_header->param1; |
5362 | + suspend_debug_state = suspend_header->param2; |
5363 | + console_loglevel = suspend_header->param3; |
5364 | + clear_suspend_state(SUSPEND_IGNORE_LOGLEVEL); |
5365 | + pagedir2.size = suspend_header->pageset_2_size; |
5366 | + for (i = 0; i < 4; i++) |
5367 | + suspend_io_time[i/2][i%2] = |
5368 | + suspend_header->io_time[i/2][i%2]; |
5369 | + |
5370 | + /* Read module configurations */ |
5371 | + if ((result = read_module_configs())) { |
5372 | + pagedir1.size = pagedir2.size = 0; |
5373 | + printk("Suspend2: Failed to read Suspend module " |
5374 | + "configurations.\n"); |
5375 | + clear_action_state(SUSPEND_KEEP_IMAGE); |
5376 | + goto out_invalidate_image; |
5377 | + } |
5378 | + |
5379 | + suspend_prepare_console(); |
5380 | + |
5381 | + set_suspend_state(SUSPEND_NOW_RESUMING); |
5382 | + |
5383 | + if (pre_resume_freeze()) |
5384 | + goto out_reset_console; |
5385 | + |
5386 | + suspend_cond_pause(1, "About to read original pageset1 locations."); |
5387 | + |
5388 | + /* |
5389 | + * Read original pageset1 locations. These are the addresses we can't |
5390 | + * use for the data to be restored. |
5391 | + */ |
5392 | + |
5393 | + if (allocate_dyn_pageflags(&pageset1_map) || |
5394 | + allocate_dyn_pageflags(&pageset1_copy_map) || |
5395 | + allocate_dyn_pageflags(&io_map)) |
5396 | + goto out_reset_console; |
5397 | + |
5398 | + if (load_dyn_pageflags(pageset1_map)) |
5399 | + goto out_reset_console; |
5400 | + |
5401 | + /* Clean up after reading the header */ |
5402 | + if ((result = suspendActiveAllocator->read_header_cleanup())) { |
5403 | + printk("Suspend2: Failed to cleanup after reading the image " |
5404 | + "header.\n"); |
5405 | + goto out_reset_console; |
5406 | + } |
5407 | + |
5408 | + suspend_cond_pause(1, "About to read pagedir."); |
5409 | + |
5410 | + /* |
5411 | + * Get the addresses of pages into which we will load the kernel to |
5412 | + * be copied back |
5413 | + */ |
5414 | + if (suspend_get_pageset1_load_addresses()) { |
5415 | + printk("Suspend2: Failed to get load addresses for pageset1.\n"); |
5416 | + goto out_reset_console; |
5417 | + } |
5418 | + |
5419 | + /* Read the original kernel back */ |
5420 | + suspend_cond_pause(1, "About to read pageset 1."); |
5421 | + |
5422 | + if (read_pageset(&pagedir1, 0)) { |
5423 | + suspend_prepare_status(CLEAR_BAR, "Failed to read pageset 1."); |
5424 | + result = -EIO; |
5425 | + printk("Suspend2: Failed to get load pageset1.\n"); |
5426 | + goto out_reset_console; |
5427 | + } |
5428 | + |
5429 | + suspend_cond_pause(1, "About to restore original kernel."); |
5430 | + result = 0; |
5431 | + |
5432 | + if (!test_action_state(SUSPEND_KEEP_IMAGE) && |
5433 | + suspendActiveAllocator->mark_resume_attempted) |
5434 | + suspendActiveAllocator->mark_resume_attempted(1); |
5435 | + |
5436 | +out: |
5437 | + free_page((unsigned long) header_buffer); |
5438 | + return result; |
5439 | + |
5440 | +out_reset_console: |
5441 | + suspend_cleanup_console(); |
5442 | + |
5443 | +out_invalidate_image: |
5444 | + free_dyn_pageflags(&pageset1_map); |
5445 | + free_dyn_pageflags(&pageset1_copy_map); |
5446 | + free_dyn_pageflags(&io_map); |
5447 | + result = -EINVAL; |
5448 | + if (!test_action_state(SUSPEND_KEEP_IMAGE)) |
5449 | + suspendActiveAllocator->invalidate_image(); |
5450 | + suspendActiveAllocator->read_header_cleanup(); |
5451 | + noresume_reset_modules(); |
5452 | + goto out; |
5453 | +} |
5454 | + |
5455 | +/* read_pageset1() |
5456 | + * |
5457 | + * Description: Attempt to read the header and pageset1 of a suspend image. |
5458 | + * Handle the outcome, complaining where appropriate. |
5459 | + */ |
5460 | + |
5461 | +int read_pageset1(void) |
5462 | +{ |
5463 | + int error; |
5464 | + |
5465 | + error = __read_pageset1(); |
5466 | + |
5467 | + switch (error) { |
5468 | + case 0: |
5469 | + case -ENODATA: |
5470 | + case -EINVAL: /* non fatal error */ |
5471 | + break; |
5472 | + default: |
5473 | + if (test_result_state(SUSPEND_ABORTED)) |
5474 | + break; |
5475 | + |
5476 | + abort_suspend(SUSPEND_IMAGE_ERROR, |
5477 | + "Suspend2: Error %d resuming\n", |
5478 | + error); |
5479 | + } |
5480 | + return error; |
5481 | +} |
5482 | + |
5483 | +/* |
5484 | + * get_have_image_data() |
5485 | + */ |
5486 | +static char *get_have_image_data(void) |
5487 | +{ |
5488 | + char *output_buffer = (char *) get_zeroed_page(GFP_ATOMIC); |
5489 | + struct suspend_header *suspend_header; |
5490 | + |
5491 | + if (!output_buffer) { |
5492 | + printk("Output buffer null.\n"); |
5493 | + return NULL; |
5494 | + } |
5495 | + |
5496 | + /* Check for an image */ |
5497 | + if (!suspendActiveAllocator->image_exists() || |
5498 | + suspendActiveAllocator->read_header_init() || |
5499 | + suspendActiveAllocator->rw_header_chunk(READ, NULL, |
5500 | + output_buffer, sizeof(struct suspend_header))) { |
5501 | + sprintf(output_buffer, "0\n"); |
5502 | + goto out; |
5503 | + } |
5504 | + |
5505 | + suspend_header = (struct suspend_header *) output_buffer; |
5506 | + |
5507 | + sprintf(output_buffer, "1\n%s\n%s\n", |
5508 | + suspend_header->uts.machine, |
5509 | + suspend_header->uts.version); |
5510 | + |
5511 | + /* Check whether we've resumed before */ |
5512 | + if (test_suspend_state(SUSPEND_RESUMED_BEFORE)) |
5513 | + strcat(output_buffer, "Resumed before.\n"); |
5514 | + |
5515 | +out: |
5516 | + noresume_reset_modules(); |
5517 | + return output_buffer; |
5518 | +} |
5519 | + |
5520 | +/* read_pageset2() |
5521 | + * |
5522 | + * Description: Read in part or all of pageset2 of an image, depending upon |
5523 | + * whether we are suspending and have only overwritten a portion |
5524 | + * with pageset1 pages, or are resuming and need to read them |
5525 | + * all. |
5526 | + * Arguments: Int. Boolean. Read only pages which would have been |
5527 | + * overwritten by pageset1? |
5528 | + * Returns: Int. Zero if no error, otherwise the error value. |
5529 | + */ |
5530 | +int read_pageset2(int overwrittenpagesonly) |
5531 | +{ |
5532 | + int result = 0; |
5533 | + |
5534 | + if (!pagedir2.size) |
5535 | + return 0; |
5536 | + |
5537 | + result = read_pageset(&pagedir2, overwrittenpagesonly); |
5538 | + |
5539 | + suspend_update_status(100, 100, NULL); |
5540 | + suspend_cond_pause(1, "Pagedir 2 read."); |
5541 | + |
5542 | + return result; |
5543 | +} |
5544 | + |
5545 | +/* image_exists_read |
5546 | + * |
5547 | + * Return 0 or 1, depending on whether an image is found. |
5548 | + * Incoming buffer is PAGE_SIZE and result is guaranteed |
5549 | + * to be far less than that, so we don't worry about |
5550 | + * overflow. |
5551 | + */ |
5552 | +int image_exists_read(const char *page, int count) |
5553 | +{ |
5554 | + int len = 0; |
5555 | + char *result; |
5556 | + |
5557 | + if (suspend_activate_storage(0)) |
5558 | + return count; |
5559 | + |
5560 | + if (!test_suspend_state(SUSPEND_RESUME_DEVICE_OK)) |
5561 | + suspend_attempt_to_parse_resume_device(0); |
5562 | + |
5563 | + if (!suspendActiveAllocator) { |
5564 | + len = sprintf((char *) page, "-1\n"); |
5565 | + } else { |
5566 | + result = get_have_image_data(); |
5567 | + if (result) { |
5568 | + len = sprintf((char *) page, "%s", result); |
5569 | + free_page((unsigned long) result); |
5570 | + } |
5571 | + } |
5572 | + |
5573 | + suspend_deactivate_storage(0); |
5574 | + |
5575 | + return len; |
5576 | +} |
5577 | + |
5578 | +/* image_exists_write |
5579 | + * |
5580 | + * Invalidate an image if one exists. |
5581 | + */ |
5582 | +int image_exists_write(const char *buffer, int count) |
5583 | +{ |
5584 | + if (suspend_activate_storage(0)) |
5585 | + return count; |
5586 | + |
5587 | + if (suspendActiveAllocator && suspendActiveAllocator->image_exists()) |
5588 | + suspendActiveAllocator->invalidate_image(); |
5589 | + |
5590 | + suspend_deactivate_storage(0); |
5591 | + |
5592 | + clear_result_state(SUSPEND_KEPT_IMAGE); |
5593 | + |
5594 | + return count; |
5595 | +} |
5596 | + |
5597 | +#ifdef CONFIG_SUSPEND2_EXPORTS |
5598 | +EXPORT_SYMBOL_GPL(suspend_attempt_to_parse_resume_device); |
5599 | +EXPORT_SYMBOL_GPL(attempt_to_parse_resume_device2); |
5600 | +#endif |
5601 | + |
5602 | diff --git a/kernel/power/io.h b/kernel/power/io.h |
5603 | new file mode 100644 |
5604 | index 0000000..527b39e |
5605 | --- /dev/null |
5606 | +++ b/kernel/power/io.h |
5607 | @@ -0,0 +1,56 @@ |
5608 | +/* |
5609 | + * kernel/power/io.h |
5610 | + * |
5611 | + * Copyright (C) 2005-2007 Nigel Cunningham (nigel at suspend2 net) |
5612 | + * |
5613 | + * This file is released under the GPLv2. |
5614 | + * |
5615 | + * It contains high level IO routines for suspending. |
5616 | + * |
5617 | + */ |
5618 | + |
5619 | +#include <linux/utsname.h> |
5620 | +#include "pagedir.h" |
5621 | + |
5622 | +/* Non-module data saved in our image header */ |
5623 | +struct suspend_header { |
5624 | + u32 version_code; |
5625 | + unsigned long num_physpages; |
5626 | + unsigned long orig_mem_free; |
5627 | + struct new_utsname uts; |
5628 | + int num_cpus; |
5629 | + int page_size; |
5630 | + int pageset_2_size; |
5631 | + int param0; |
5632 | + int param1; |
5633 | + int param2; |
5634 | + int param3; |
5635 | + int progress0; |
5636 | + int progress1; |
5637 | + int progress2; |
5638 | + int progress3; |
5639 | + int io_time[2][2]; |
5640 | + struct pagedir pagedir; |
5641 | + dev_t root_fs; |
5642 | +}; |
5643 | + |
5644 | +extern int write_pageset(struct pagedir *pagedir); |
5645 | +extern int write_image_header(void); |
5646 | +extern int read_pageset1(void); |
5647 | +extern int read_pageset2(int overwrittenpagesonly); |
5648 | + |
5649 | +extern int suspend_attempt_to_parse_resume_device(int quiet); |
5650 | +extern void attempt_to_parse_resume_device2(void); |
5651 | +extern void attempt_to_parse_po_resume_device2(void); |
5652 | +int image_exists_read(const char *page, int count); |
5653 | +int image_exists_write(const char *buffer, int count); |
5654 | +extern void save_restore_resume2(int replace, int quiet); |
5655 | + |
5656 | +/* Args to save_restore_resume2 */ |
5657 | +#define RESTORE 0 |
5658 | +#define SAVE 1 |
5659 | + |
5660 | +#define NOQUIET 0 |
5661 | +#define QUIET 1 |
5662 | + |
5663 | +extern dev_t name_to_dev_t(char *line); |
5664 | diff --git a/kernel/power/main.c b/kernel/power/main.c |
5665 | index a064dfd..05b6686 100644 |
5666 | --- a/kernel/power/main.c |
5667 | +++ b/kernel/power/main.c |
5668 | @@ -155,7 +155,7 @@ static void suspend_finish(suspend_state_t state) |
5669 | static const char * const pm_states[PM_SUSPEND_MAX] = { |
5670 | [PM_SUSPEND_STANDBY] = "standby", |
5671 | [PM_SUSPEND_MEM] = "mem", |
5672 | -#ifdef CONFIG_SOFTWARE_SUSPEND |
5673 | +#if defined(CONFIG_SOFTWARE_SUSPEND) || defined(CONFIG_SUSPEND2) |
5674 | [PM_SUSPEND_DISK] = "disk", |
5675 | #endif |
5676 | }; |
5677 | diff --git a/kernel/power/modules.c b/kernel/power/modules.c |
5678 | new file mode 100644 |
5679 | index 0000000..a6b574f |
5680 | --- /dev/null |
5681 | +++ b/kernel/power/modules.c |
5682 | @@ -0,0 +1,415 @@ |
5683 | +/* |
5684 | + * kernel/power/modules.c |
5685 | + * |
5686 | + * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
5687 | + * |
5688 | + */ |
5689 | + |
5690 | +#include <linux/suspend.h> |
5691 | +#include <linux/module.h> |
5692 | +#include "suspend.h" |
5693 | +#include "modules.h" |
5694 | +#include "sysfs.h" |
5695 | +#include "ui.h" |
5696 | + |
5697 | +struct list_head suspend_filters, suspendAllocators, suspend_modules; |
5698 | +struct suspend_module_ops *suspendActiveAllocator; |
5699 | +int suspend_num_filters; |
5700 | +int suspendNumAllocators, suspend_num_modules; |
5701 | +int initialised; |
5702 | + |
5703 | +static inline void suspend_initialise_module_lists(void) { |
5704 | + INIT_LIST_HEAD(&suspend_filters); |
5705 | + INIT_LIST_HEAD(&suspendAllocators); |
5706 | + INIT_LIST_HEAD(&suspend_modules); |
5707 | +} |
5708 | + |
5709 | +/* |
5710 | + * suspend_header_storage_for_modules |
5711 | + * |
5712 | + * Returns the amount of space needed to store configuration |
5713 | + * data needed by the modules prior to copying back the original |
5714 | + * kernel. We can exclude data for pageset2 because it will be |
5715 | + * available anyway once the kernel is copied back. |
5716 | + */ |
5717 | +int suspend_header_storage_for_modules(void) |
5718 | +{ |
5719 | + struct suspend_module_ops *this_module; |
5720 | + int bytes = 0; |
5721 | + |
5722 | + list_for_each_entry(this_module, &suspend_modules, module_list) { |
5723 | + if (!this_module->enabled || |
5724 | + (this_module->type == WRITER_MODULE && |
5725 | + suspendActiveAllocator != this_module)) |
5726 | + continue; |
5727 | + if (this_module->storage_needed) { |
5728 | + int this = this_module->storage_needed() + |
5729 | + sizeof(struct suspend_module_header) + |
5730 | + sizeof(int); |
5731 | + this_module->header_requested = this; |
5732 | + bytes += this; |
5733 | + } |
5734 | + } |
5735 | + |
5736 | + /* One more for the empty terminator */ |
5737 | + return bytes + sizeof(struct suspend_module_header); |
5738 | +} |
5739 | + |
5740 | +/* |
5741 | + * suspend_memory_for_modules |
5742 | + * |
5743 | + * Returns the amount of memory requested by modules for |
5744 | + * doing their work during the cycle. |
5745 | + */ |
5746 | + |
5747 | +int suspend_memory_for_modules(void) |
5748 | +{ |
5749 | + int bytes = 0; |
5750 | + struct suspend_module_ops *this_module; |
5751 | + |
5752 | + list_for_each_entry(this_module, &suspend_modules, module_list) { |
5753 | + if (!this_module->enabled) |
5754 | + continue; |
5755 | + if (this_module->memory_needed) |
5756 | + bytes += this_module->memory_needed(); |
5757 | + } |
5758 | + |
5759 | + return ((bytes + PAGE_SIZE - 1) >> PAGE_SHIFT); |
5760 | +} |
5761 | + |
5762 | +/* |
5763 | + * suspend_expected_compression_ratio |
5764 | + * |
5765 | + * Returns the compression ratio expected when saving the image. |
5766 | + */ |
5767 | + |
5768 | +int suspend_expected_compression_ratio(void) |
5769 | +{ |
5770 | + int ratio = 100; |
5771 | + struct suspend_module_ops *this_module; |
5772 | + |
5773 | + list_for_each_entry(this_module, &suspend_modules, module_list) { |
5774 | + if (!this_module->enabled) |
5775 | + continue; |
5776 | + if (this_module->expected_compression) |
5777 | + ratio = ratio * this_module->expected_compression() / 100; |
5778 | + } |
5779 | + |
5780 | + return ratio; |
5781 | +} |
5782 | + |
5783 | +/* suspend_find_module_given_name |
5784 | + * Functionality : Return a module (if found), given a pointer |
5785 | + * to its name |
5786 | + */ |
5787 | + |
5788 | +struct suspend_module_ops *suspend_find_module_given_name(char *name) |
5789 | +{ |
5790 | + struct suspend_module_ops *this_module, *found_module = NULL; |
5791 | + |
5792 | + list_for_each_entry(this_module, &suspend_modules, module_list) { |
5793 | + if (!strcmp(name, this_module->name)) { |
5794 | + found_module = this_module; |
5795 | + break; |
5796 | + } |
5797 | + } |
5798 | + |
5799 | + return found_module; |
5800 | +} |
5801 | + |
5802 | +/* |
5803 | + * suspend_print_module_debug_info |
5804 | + * Functionality : Get debugging info from modules into a buffer. |
5805 | + */ |
5806 | +int suspend_print_module_debug_info(char *buffer, int buffer_size) |
5807 | +{ |
5808 | + struct suspend_module_ops *this_module; |
5809 | + int len = 0; |
5810 | + |
5811 | + list_for_each_entry(this_module, &suspend_modules, module_list) { |
5812 | + if (!this_module->enabled) |
5813 | + continue; |
5814 | + if (this_module->print_debug_info) { |
5815 | + int result; |
5816 | + result = this_module->print_debug_info(buffer + len, |
5817 | + buffer_size - len); |
5818 | + len += result; |
5819 | + } |
5820 | + } |
5821 | + |
5822 | + /* Ensure null terminated */ |
5823 | + buffer[buffer_size] = 0; |
5824 | + |
5825 | + return len; |
5826 | +} |
5827 | + |
5828 | +/* |
5829 | + * suspend_register_module |
5830 | + * |
5831 | + * Register a module. |
5832 | + */ |
5833 | +int suspend_register_module(struct suspend_module_ops *module) |
5834 | +{ |
5835 | + int i; |
5836 | + struct kobject *kobj; |
5837 | + |
5838 | + if (!initialised) { |
5839 | + suspend_initialise_module_lists(); |
5840 | + initialised = 1; |
5841 | + } |
5842 | + |
5843 | + module->enabled = 1; |
5844 | + |
5845 | + if (suspend_find_module_given_name(module->name)) { |
5846 | + printk("Suspend2: Trying to load module %s," |
5847 | + " which is already registered.\n", |
5848 | + module->name); |
5849 | + return -EBUSY; |
5850 | + } |
5851 | + |
5852 | + switch (module->type) { |
5853 | + case FILTER_MODULE: |
5854 | + list_add_tail(&module->type_list, |
5855 | + &suspend_filters); |
5856 | + suspend_num_filters++; |
5857 | + break; |
5858 | + |
5859 | + case WRITER_MODULE: |
5860 | + list_add_tail(&module->type_list, |
5861 | + &suspendAllocators); |
5862 | + suspendNumAllocators++; |
5863 | + break; |
5864 | + |
5865 | + case MISC_MODULE: |
5866 | + break; |
5867 | + |
5868 | + default: |
5869 | + printk("Hmmm. Module '%s' has an invalid type." |
5870 | + " It has been ignored.\n", module->name); |
5871 | + return -EINVAL; |
5872 | + } |
5873 | + list_add_tail(&module->module_list, &suspend_modules); |
5874 | + suspend_num_modules++; |
5875 | + |
5876 | + if (module->directory || module->shared_directory) { |
5877 | + /* |
5878 | + * Modules may share a directory, but those with shared_dir |
5879 | + * set must be loaded (via symbol dependencies) after parents |
5880 | + * and unloaded beforehand. |
5881 | + */ |
5882 | + if (module->shared_directory) { |
5883 | + struct suspend_module_ops *shared = |
5884 | + suspend_find_module_given_name(module->shared_directory); |
5885 | + if (!shared) { |
5886 | + printk("Suspend2: Module %s wants to share %s's directory but %s isn't loaded.\n", |
5887 | + module->name, |
5888 | + module->shared_directory, |
5889 | + module->shared_directory); |
5890 | + suspend_unregister_module(module); |
5891 | + return -ENODEV; |
5892 | + } |
5893 | + kobj = shared->dir_kobj; |
5894 | + } else |
5895 | + kobj = make_suspend2_sysdir(module->directory); |
5896 | + module->dir_kobj = kobj; |
5897 | + for (i=0; i < module->num_sysfs_entries; i++) { |
5898 | + int result = suspend_register_sysfs_file(kobj, &module->sysfs_data[i]); |
5899 | + if (result) |
5900 | + return result; |
5901 | + } |
5902 | + } |
5903 | + |
5904 | + printk("Suspend2 %s support registered.\n", module->name); |
5905 | + return 0; |
5906 | +} |
5907 | + |
5908 | +/* |
5909 | + * suspend_unregister_module |
5910 | + * |
5911 | + * Remove a module. |
5912 | + */ |
5913 | +void suspend_unregister_module(struct suspend_module_ops *module) |
5914 | +{ |
5915 | + int i; |
5916 | + |
5917 | + if (module->dir_kobj) |
5918 | + for (i=0; i < module->num_sysfs_entries; i++) |
5919 | + suspend_unregister_sysfs_file(module->dir_kobj, &module->sysfs_data[i]); |
5920 | + |
5921 | + if (!module->shared_directory && module->directory) |
5922 | + remove_suspend2_sysdir(module->dir_kobj); |
5923 | + |
5924 | + switch (module->type) { |
5925 | + case FILTER_MODULE: |
5926 | + list_del(&module->type_list); |
5927 | + suspend_num_filters--; |
5928 | + break; |
5929 | + |
5930 | + case WRITER_MODULE: |
5931 | + list_del(&module->type_list); |
5932 | + suspendNumAllocators--; |
5933 | + if (suspendActiveAllocator == module) { |
5934 | + suspendActiveAllocator = NULL; |
5935 | + clear_suspend_state(SUSPEND_CAN_RESUME); |
5936 | + clear_suspend_state(SUSPEND_CAN_SUSPEND); |
5937 | + } |
5938 | + break; |
5939 | + |
5940 | + case MISC_MODULE: |
5941 | + break; |
5942 | + |
5943 | + default: |
5944 | + printk("Hmmm. Module '%s' has an invalid type." |
5945 | + " It has been ignored.\n", module->name); |
5946 | + return; |
5947 | + } |
5948 | + list_del(&module->module_list); |
5949 | + suspend_num_modules--; |
5950 | + printk("Suspend2 %s module unloaded.\n", module->name); |
5951 | +} |
5952 | + |
5953 | +/* |
5954 | + * suspend_move_module_tail |
5955 | + * |
5956 | + * Rearrange modules when reloading the config. |
5957 | + */ |
5958 | +void suspend_move_module_tail(struct suspend_module_ops *module) |
5959 | +{ |
5960 | + switch (module->type) { |
5961 | + case FILTER_MODULE: |
5962 | + if (suspend_num_filters > 1) |
5963 | + list_move_tail(&module->type_list, |
5964 | + &suspend_filters); |
5965 | + break; |
5966 | + |
5967 | + case WRITER_MODULE: |
5968 | + if (suspendNumAllocators > 1) |
5969 | + list_move_tail(&module->type_list, |
5970 | + &suspendAllocators); |
5971 | + break; |
5972 | + |
5973 | + case MISC_MODULE: |
5974 | + break; |
5975 | + default: |
5976 | + printk("Hmmm. Module '%s' has an invalid type." |
5977 | + " It has been ignored.\n", module->name); |
5978 | + return; |
5979 | + } |
5980 | + if ((suspend_num_filters + suspendNumAllocators) > 1) |
5981 | + list_move_tail(&module->module_list, &suspend_modules); |
5982 | +} |
5983 | + |
5984 | +/* |
5985 | + * suspend_initialise_modules |
5986 | + * |
5987 | + * Get ready to do some work! |
5988 | + */ |
5989 | +int suspend_initialise_modules(int starting_cycle) |
5990 | +{ |
5991 | + struct suspend_module_ops *this_module; |
5992 | + int result; |
5993 | + |
5994 | + list_for_each_entry(this_module, &suspend_modules, module_list) { |
5995 | + this_module->header_requested = 0; |
5996 | + this_module->header_used = 0; |
5997 | + if (!this_module->enabled) |
5998 | + continue; |
5999 | + if (this_module->initialise) { |
6000 | + suspend_message(SUSPEND_MEMORY, SUSPEND_MEDIUM, 1, |
6001 | + "Initialising module %s.\n", |
6002 | + this_module->name); |
6003 | + if ((result = this_module->initialise(starting_cycle))) { |
6004 | + printk("%s didn't initialise okay.\n", |
6005 | + this_module->name); |
6006 | + return result; |
6007 | + } |
6008 | + } |
6009 | + } |
6010 | + |
6011 | + return 0; |
6012 | +} |
6013 | + |
6014 | +/* |
6015 | + * suspend_cleanup_modules |
6016 | + * |
6017 | + * Tell modules the work is done. |
6018 | + */ |
6019 | +void suspend_cleanup_modules(int finishing_cycle) |
6020 | +{ |
6021 | + struct suspend_module_ops *this_module; |
6022 | + |
6023 | + list_for_each_entry(this_module, &suspend_modules, module_list) { |
6024 | + if (!this_module->enabled) |
6025 | + continue; |
6026 | + if (this_module->cleanup) { |
6027 | + suspend_message(SUSPEND_MEMORY, SUSPEND_MEDIUM, 1, |
6028 | + "Cleaning up module %s.\n", |
6029 | + this_module->name); |
6030 | + this_module->cleanup(finishing_cycle); |
6031 | + } |
6032 | + } |
6033 | +} |
6034 | + |
6035 | +/* |
6036 | + * suspend_get_next_filter |
6037 | + * |
6038 | + * Get the next filter in the pipeline. |
6039 | + */ |
6040 | +struct suspend_module_ops *suspend_get_next_filter(struct suspend_module_ops *filter_sought) |
6041 | +{ |
6042 | + struct suspend_module_ops *last_filter = NULL, *this_filter = NULL; |
6043 | + |
6044 | + list_for_each_entry(this_filter, &suspend_filters, type_list) { |
6045 | + if (!this_filter->enabled) |
6046 | + continue; |
6047 | + if ((last_filter == filter_sought) || (!filter_sought)) |
6048 | + return this_filter; |
6049 | + last_filter = this_filter; |
6050 | + } |
6051 | + |
6052 | + return suspendActiveAllocator; |
6053 | +} |
6054 | + |
6055 | +/* suspend_get_modules |
6056 | + * |
6057 | + * Take a reference to modules so they can't go away under us. |
6058 | + */ |
6059 | + |
6060 | +int suspend_get_modules(void) |
6061 | +{ |
6062 | + struct suspend_module_ops *this_module; |
6063 | + |
6064 | + list_for_each_entry(this_module, &suspend_modules, module_list) { |
6065 | + if (!try_module_get(this_module->module)) { |
6066 | + /* Failed! Reverse gets and return error */ |
6067 | + struct suspend_module_ops *this_module2; |
6068 | + list_for_each_entry(this_module2, &suspend_modules, module_list) { |
6069 | + if (this_module == this_module2) |
6070 | + return -EINVAL; |
6071 | + module_put(this_module2->module); |
6072 | + } |
6073 | + } |
6074 | + } |
6075 | + |
6076 | + return 0; |
6077 | +} |
6078 | + |
6079 | +/* suspend_put_modules |
6080 | + * |
6081 | + * Release our references to modules we used. |
6082 | + */ |
6083 | + |
6084 | +void suspend_put_modules(void) |
6085 | +{ |
6086 | + struct suspend_module_ops *this_module; |
6087 | + |
6088 | + list_for_each_entry(this_module, &suspend_modules, module_list) |
6089 | + module_put(this_module->module); |
6090 | +} |
6091 | + |
6092 | +#ifdef CONFIG_SUSPEND2_EXPORTS |
6093 | +EXPORT_SYMBOL_GPL(suspend_register_module); |
6094 | +EXPORT_SYMBOL_GPL(suspend_unregister_module); |
6095 | +EXPORT_SYMBOL_GPL(suspend_get_next_filter); |
6096 | +EXPORT_SYMBOL_GPL(suspendActiveAllocator); |
6097 | +#endif |
6098 | diff --git a/kernel/power/modules.h b/kernel/power/modules.h |
6099 | new file mode 100644 |
6100 | index 0000000..ed94458 |
6101 | --- /dev/null |
6102 | +++ b/kernel/power/modules.h |
6103 | @@ -0,0 +1,164 @@ |
6104 | +/* |
6105 | + * kernel/power/modules.h |
6106 | + * |
6107 | + * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
6108 | + * |
6109 | + * This file is released under the GPLv2. |
6110 | + * |
6111 | + * It contains declarations for modules. Modules are additions to |
6112 | + * suspend2 that provide facilities such as image compression or |
6113 | + * encryption, backends for storage of the image and user interfaces. |
6114 | + * |
6115 | + */ |
6116 | + |
6117 | +#ifndef SUSPEND_MODULES_H |
6118 | +#define SUSPEND_MODULES_H |
6119 | + |
6120 | +/* This is the maximum size we store in the image header for a module name */ |
6121 | +#define SUSPEND_MAX_MODULE_NAME_LENGTH 30 |
6122 | + |
6123 | +/* Per-module metadata */ |
6124 | +struct suspend_module_header { |
6125 | + char name[SUSPEND_MAX_MODULE_NAME_LENGTH]; |
6126 | + int enabled; |
6127 | + int type; |
6128 | + int index; |
6129 | + int data_length; |
6130 | + unsigned long signature; |
6131 | +}; |
6132 | + |
6133 | +enum { |
6134 | + FILTER_MODULE, |
6135 | + WRITER_MODULE, |
6136 | + MISC_MODULE /* Block writer, eg. */ |
6137 | +}; |
6138 | + |
6139 | +enum { |
6140 | + SUSPEND_ASYNC, |
6141 | + SUSPEND_SYNC |
6142 | +}; |
6143 | + |
6144 | +struct suspend_module_ops { |
6145 | + /* Functions common to all modules */ |
6146 | + int type; |
6147 | + char *name; |
6148 | + char *directory; |
6149 | + char *shared_directory; |
6150 | + struct kobject *dir_kobj; |
6151 | + struct module *module; |
6152 | + int enabled; |
6153 | + struct list_head module_list; |
6154 | + |
6155 | + /* List of filters or allocators */ |
6156 | + struct list_head list, type_list; |
6157 | + |
6158 | + /* |
6159 | + * Requirements for memory and storage in |
6160 | + * the image header.. |
6161 | + */ |
6162 | + int (*memory_needed) (void); |
6163 | + int (*storage_needed) (void); |
6164 | + |
6165 | + int header_requested, header_used; |
6166 | + |
6167 | + int (*expected_compression) (void); |
6168 | + |
6169 | + /* |
6170 | + * Debug info |
6171 | + */ |
6172 | + int (*print_debug_info) (char *buffer, int size); |
6173 | + int (*save_config_info) (char *buffer); |
6174 | + void (*load_config_info) (char *buffer, int len); |
6175 | + |
6176 | + /* |
6177 | + * Initialise & cleanup - general routines called |
6178 | + * at the start and end of a cycle. |
6179 | + */ |
6180 | + int (*initialise) (int starting_cycle); |
6181 | + void (*cleanup) (int finishing_cycle); |
6182 | + |
6183 | + /* |
6184 | + * Calls for allocating storage (allocators only). |
6185 | + * |
6186 | + * Header space is allocated separately. Note that allocation |
6187 | + * of space for the header might result in allocated space |
6188 | + * being stolen from the main pool if there is no unallocated |
6189 | + * space. We have to be able to allocate enough space for |
6190 | + * the header. We can eat memory to ensure there is enough |
6191 | + * for the main pool. |
6192 | + */ |
6193 | + |
6194 | + int (*storage_available) (void); |
6195 | + int (*allocate_header_space) (int space_requested); |
6196 | + int (*allocate_storage) (int space_requested); |
6197 | + int (*storage_allocated) (void); |
6198 | + int (*release_storage) (void); |
6199 | + |
6200 | + /* |
6201 | + * Routines used in image I/O. |
6202 | + */ |
6203 | + int (*rw_init) (int rw, int stream_number); |
6204 | + int (*rw_cleanup) (int rw); |
6205 | + int (*write_chunk) (unsigned long index, struct page *buffer_page, |
6206 | + unsigned int buf_size); |
6207 | + int (*read_chunk) (unsigned long *index, struct page *buffer_page, |
6208 | + unsigned int *buf_size, int sync); |
6209 | + |
6210 | + /* Reset module if image exists but reading aborted */ |
6211 | + void (*noresume_reset) (void); |
6212 | + |
6213 | + /* Read and write the metadata */ |
6214 | + int (*write_header_init) (void); |
6215 | + int (*write_header_cleanup) (void); |
6216 | + |
6217 | + int (*read_header_init) (void); |
6218 | + int (*read_header_cleanup) (void); |
6219 | + |
6220 | + int (*rw_header_chunk) (int rw, struct suspend_module_ops *owner, |
6221 | + char *buffer_start, int buffer_size); |
6222 | + |
6223 | + /* Attempt to parse an image location */ |
6224 | + int (*parse_sig_location) (char *buffer, int only_writer, int quiet); |
6225 | + |
6226 | + /* Determine whether image exists that we can restore */ |
6227 | + int (*image_exists) (void); |
6228 | + |
6229 | + /* Mark the image as having tried to resume */ |
6230 | + void (*mark_resume_attempted) (int); |
6231 | + |
6232 | + /* Destroy image if one exists */ |
6233 | + int (*invalidate_image) (void); |
6234 | + |
6235 | + /* Sysfs Data */ |
6236 | + struct suspend_sysfs_data *sysfs_data; |
6237 | + int num_sysfs_entries; |
6238 | +}; |
6239 | + |
6240 | +extern int suspend_num_modules, suspendNumAllocators; |
6241 | + |
6242 | +extern struct suspend_module_ops *suspendActiveAllocator; |
6243 | +extern struct list_head suspend_filters, suspendAllocators, suspend_modules; |
6244 | + |
6245 | +extern void suspend_prepare_console_modules(void); |
6246 | +extern void suspend_cleanup_console_modules(void); |
6247 | + |
6248 | +extern struct suspend_module_ops *suspend_find_module_given_name(char *name); |
6249 | +extern struct suspend_module_ops *suspend_get_next_filter(struct suspend_module_ops *); |
6250 | + |
6251 | +extern int suspend_register_module(struct suspend_module_ops *module); |
6252 | +extern void suspend_move_module_tail(struct suspend_module_ops *module); |
6253 | + |
6254 | +extern int suspend_header_storage_for_modules(void); |
6255 | +extern int suspend_memory_for_modules(void); |
6256 | +extern int suspend_expected_compression_ratio(void); |
6257 | + |
6258 | +extern int suspend_print_module_debug_info(char *buffer, int buffer_size); |
6259 | +extern int suspend_register_module(struct suspend_module_ops *module); |
6260 | +extern void suspend_unregister_module(struct suspend_module_ops *module); |
6261 | + |
6262 | +extern int suspend_initialise_modules(int starting_cycle); |
6263 | +extern void suspend_cleanup_modules(int finishing_cycle); |
6264 | + |
6265 | +int suspend_get_modules(void); |
6266 | +void suspend_put_modules(void); |
6267 | +#endif |
6268 | diff --git a/kernel/power/netlink.c b/kernel/power/netlink.c |
6269 | new file mode 100644 |
6270 | index 0000000..bb1d563 |
6271 | --- /dev/null |
6272 | +++ b/kernel/power/netlink.c |
6273 | @@ -0,0 +1,387 @@ |
6274 | +/* |
6275 | + * kernel/power/netlink.c |
6276 | + * |
6277 | + * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
6278 | + * |
6279 | + * This file is released under the GPLv2. |
6280 | + * |
6281 | + * Functions for communicating with a userspace helper via netlink. |
6282 | + */ |
6283 | + |
6284 | + |
6285 | +#include <linux/suspend.h> |
6286 | +#include "netlink.h" |
6287 | +#include "suspend.h" |
6288 | +#include "modules.h" |
6289 | + |
6290 | +struct user_helper_data *uhd_list = NULL; |
6291 | + |
6292 | +/* |
6293 | + * Refill our pool of SKBs for use in emergencies (eg, when eating memory and none |
6294 | + * can be allocated). |
6295 | + */ |
6296 | +static void suspend_fill_skb_pool(struct user_helper_data *uhd) |
6297 | +{ |
6298 | + while (uhd->pool_level < uhd->pool_limit) { |
6299 | + struct sk_buff *new_skb = |
6300 | + alloc_skb(NLMSG_SPACE(uhd->skb_size), GFP_ATOMIC); |
6301 | + |
6302 | + if (!new_skb) |
6303 | + break; |
6304 | + |
6305 | + new_skb->next = uhd->emerg_skbs; |
6306 | + uhd->emerg_skbs = new_skb; |
6307 | + uhd->pool_level++; |
6308 | + } |
6309 | +} |
6310 | + |
6311 | +/* |
6312 | + * Try to allocate a single skb. If we can't get one, try to use one from |
6313 | + * our pool. |
6314 | + */ |
6315 | +static struct sk_buff *suspend_get_skb(struct user_helper_data *uhd) |
6316 | +{ |
6317 | + struct sk_buff *skb = |
6318 | + alloc_skb(NLMSG_SPACE(uhd->skb_size), GFP_ATOMIC); |
6319 | + |
6320 | + if (skb) |
6321 | + return skb; |
6322 | + |
6323 | + skb = uhd->emerg_skbs; |
6324 | + if (skb) { |
6325 | + uhd->pool_level--; |
6326 | + uhd->emerg_skbs = skb->next; |
6327 | + skb->next = NULL; |
6328 | + } |
6329 | + |
6330 | + return skb; |
6331 | +} |
6332 | + |
6333 | +static void put_skb(struct user_helper_data *uhd, struct sk_buff *skb) |
6334 | +{ |
6335 | + if (uhd->pool_level < uhd->pool_limit) { |
6336 | + skb->next = uhd->emerg_skbs; |
6337 | + uhd->emerg_skbs = skb; |
6338 | + } else |
6339 | + kfree_skb(skb); |
6340 | +} |
6341 | + |
6342 | +void suspend_send_netlink_message(struct user_helper_data *uhd, |
6343 | + int type, void* params, size_t len) |
6344 | +{ |
6345 | + struct sk_buff *skb; |
6346 | + struct nlmsghdr *nlh; |
6347 | + void *dest; |
6348 | + struct task_struct *t; |
6349 | + |
6350 | + if (uhd->pid == -1) |
6351 | + return; |
6352 | + |
6353 | + skb = suspend_get_skb(uhd); |
6354 | + if (!skb) { |
6355 | + printk("suspend_netlink: Can't allocate skb!\n"); |
6356 | + return; |
6357 | + } |
6358 | + |
6359 | + /* NLMSG_PUT contains a hidden goto nlmsg_failure */ |
6360 | + nlh = NLMSG_PUT(skb, 0, uhd->sock_seq, type, len); |
6361 | + uhd->sock_seq++; |
6362 | + |
6363 | + dest = NLMSG_DATA(nlh); |
6364 | + if (params && len > 0) |
6365 | + memcpy(dest, params, len); |
6366 | + |
6367 | + netlink_unicast(uhd->nl, skb, uhd->pid, 0); |
6368 | + |
6369 | + read_lock(&tasklist_lock); |
6370 | + if ((t = find_task_by_pid(uhd->pid)) == NULL) { |
6371 | + read_unlock(&tasklist_lock); |
6372 | + if (uhd->pid > -1) |
6373 | + printk("Hmm. Can't find the userspace task %d.\n", uhd->pid); |
6374 | + return; |
6375 | + } |
6376 | + wake_up_process(t); |
6377 | + read_unlock(&tasklist_lock); |
6378 | + |
6379 | + yield(); |
6380 | + |
6381 | + return; |
6382 | + |
6383 | +nlmsg_failure: |
6384 | + if (skb) |
6385 | + put_skb(uhd, skb); |
6386 | +} |
6387 | + |
6388 | +static void send_whether_debugging(struct user_helper_data *uhd) |
6389 | +{ |
6390 | + static int is_debugging = 1; |
6391 | + |
6392 | + suspend_send_netlink_message(uhd, NETLINK_MSG_IS_DEBUGGING, |
6393 | + &is_debugging, sizeof(int)); |
6394 | +} |
6395 | + |
6396 | +/* |
6397 | + * Set the PF_NOFREEZE flag on the given process to ensure it can run whilst we |
6398 | + * are suspending. |
6399 | + */ |
6400 | +static int nl_set_nofreeze(struct user_helper_data *uhd, int pid) |
6401 | +{ |
6402 | + struct task_struct *t; |
6403 | + |
6404 | + read_lock(&tasklist_lock); |
6405 | + if ((t = find_task_by_pid(pid)) == NULL) { |
6406 | + read_unlock(&tasklist_lock); |
6407 | + printk("Strange. Can't find the userspace task %d.\n", pid); |
6408 | + return -EINVAL; |
6409 | + } |
6410 | + |
6411 | + t->flags |= PF_NOFREEZE; |
6412 | + |
6413 | + read_unlock(&tasklist_lock); |
6414 | + uhd->pid = pid; |
6415 | + |
6416 | + suspend_send_netlink_message(uhd, NETLINK_MSG_NOFREEZE_ACK, NULL, 0); |
6417 | + |
6418 | + return 0; |
6419 | +} |
6420 | + |
6421 | +/* |
6422 | + * Called when the userspace process has informed us that it's ready to roll. |
6423 | + */ |
6424 | +static int nl_ready(struct user_helper_data *uhd, int version) |
6425 | +{ |
6426 | + if (version != uhd->interface_version) { |
6427 | + printk("%s userspace process using invalid interface version." |
6428 | + " Trying to continue without it.\n", |
6429 | + uhd->name); |
6430 | + if (uhd->not_ready) |
6431 | + uhd->not_ready(); |
6432 | + return 1; |
6433 | + } |
6434 | + |
6435 | + complete(&uhd->wait_for_process); |
6436 | + |
6437 | + return 0; |
6438 | +} |
6439 | + |
6440 | +void suspend_netlink_close_complete(struct user_helper_data *uhd) |
6441 | +{ |
6442 | + if (uhd->nl) { |
6443 | + sock_release(uhd->nl->sk_socket); |
6444 | + uhd->nl = NULL; |
6445 | + } |
6446 | + |
6447 | + while (uhd->emerg_skbs) { |
6448 | + struct sk_buff *next = uhd->emerg_skbs->next; |
6449 | + kfree_skb(uhd->emerg_skbs); |
6450 | + uhd->emerg_skbs = next; |
6451 | + } |
6452 | + |
6453 | + uhd->pid = -1; |
6454 | + |
6455 | + suspend_put_modules(); |
6456 | +} |
6457 | + |
6458 | +static int suspend_nl_gen_rcv_msg(struct user_helper_data *uhd, |
6459 | + struct sk_buff *skb, struct nlmsghdr *nlh) |
6460 | +{ |
6461 | + int type; |
6462 | + int *data; |
6463 | + int err; |
6464 | + |
6465 | + /* Let the more specific handler go first. It returns |
6466 | + * 1 for valid messages that it doesn't know. */ |
6467 | + if ((err = uhd->rcv_msg(skb, nlh)) != 1) |
6468 | + return err; |
6469 | + |
6470 | + type = nlh->nlmsg_type; |
6471 | + |
6472 | + /* Only allow one task to receive NOFREEZE privileges */ |
6473 | + if (type == NETLINK_MSG_NOFREEZE_ME && uhd->pid != -1) { |
6474 | + printk("Received extra nofreeze me requests.\n"); |
6475 | + return -EBUSY; |
6476 | + } |
6477 | + |
6478 | + data = (int*)NLMSG_DATA(nlh); |
6479 | + |
6480 | + switch (type) { |
6481 | + case NETLINK_MSG_NOFREEZE_ME: |
6482 | + if ((err = nl_set_nofreeze(uhd, nlh->nlmsg_pid)) != 0) |
6483 | + return err; |
6484 | + break; |
6485 | + case NETLINK_MSG_GET_DEBUGGING: |
6486 | + send_whether_debugging(uhd); |
6487 | + break; |
6488 | + case NETLINK_MSG_READY: |
6489 | + if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int))) { |
6490 | + printk("Invalid ready mesage.\n"); |
6491 | + return -EINVAL; |
6492 | + } |
6493 | + if ((err = nl_ready(uhd, *data)) != 0) |
6494 | + return err; |
6495 | + break; |
6496 | + case NETLINK_MSG_CLEANUP: |
6497 | + suspend_netlink_close_complete(uhd); |
6498 | + break; |
6499 | + } |
6500 | + |
6501 | + return 0; |
6502 | +} |
6503 | + |
6504 | +static void suspend_user_rcv_skb(struct user_helper_data *uhd, |
6505 | + struct sk_buff *skb) |
6506 | +{ |
6507 | + int err; |
6508 | + struct nlmsghdr *nlh; |
6509 | + |
6510 | + while (skb->len >= NLMSG_SPACE(0)) { |
6511 | + u32 rlen; |
6512 | + |
6513 | + nlh = (struct nlmsghdr *) skb->data; |
6514 | + if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) |
6515 | + return; |
6516 | + |
6517 | + rlen = NLMSG_ALIGN(nlh->nlmsg_len); |
6518 | + if (rlen > skb->len) |
6519 | + rlen = skb->len; |
6520 | + |
6521 | + if ((err = suspend_nl_gen_rcv_msg(uhd, skb, nlh)) != 0) |
6522 | + netlink_ack(skb, nlh, err); |
6523 | + else if (nlh->nlmsg_flags & NLM_F_ACK) |
6524 | + netlink_ack(skb, nlh, 0); |
6525 | + skb_pull(skb, rlen); |
6526 | + } |
6527 | +} |
6528 | + |
6529 | +static void suspend_netlink_input(struct sock *sk, int len) |
6530 | +{ |
6531 | + struct user_helper_data *uhd = uhd_list; |
6532 | + |
6533 | + while (uhd && uhd->netlink_id != sk->sk_protocol) |
6534 | + uhd= uhd->next; |
6535 | + |
6536 | + do { |
6537 | + struct sk_buff *skb; |
6538 | + while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
6539 | + suspend_user_rcv_skb(uhd, skb); |
6540 | + put_skb(uhd, skb); |
6541 | + } |
6542 | + } while (uhd->nl && uhd->nl->sk_receive_queue.qlen); |
6543 | +} |
6544 | + |
6545 | +static int netlink_prepare(struct user_helper_data *uhd) |
6546 | +{ |
6547 | + suspend_get_modules(); |
6548 | + |
6549 | + uhd->next = uhd_list; |
6550 | + uhd_list = uhd; |
6551 | + |
6552 | + uhd->sock_seq = 0x42c0ffee; |
6553 | + uhd->nl = netlink_kernel_create(uhd->netlink_id, 0, |
6554 | + suspend_netlink_input, THIS_MODULE); |
6555 | + if (!uhd->nl) { |
6556 | + printk("Failed to allocate netlink socket for %s.\n", |
6557 | + uhd->name); |
6558 | + return -ENOMEM; |
6559 | + } |
6560 | + |
6561 | + suspend_fill_skb_pool(uhd); |
6562 | + |
6563 | + return 0; |
6564 | +} |
6565 | + |
6566 | +void suspend_netlink_close(struct user_helper_data *uhd) |
6567 | +{ |
6568 | + struct task_struct *t; |
6569 | + |
6570 | + read_lock(&tasklist_lock); |
6571 | + if ((t = find_task_by_pid(uhd->pid))) |
6572 | + t->flags &= ~PF_NOFREEZE; |
6573 | + read_unlock(&tasklist_lock); |
6574 | + |
6575 | + suspend_send_netlink_message(uhd, NETLINK_MSG_CLEANUP, NULL, 0); |
6576 | +} |
6577 | + |
6578 | +static int suspend2_launch_userspace_program(char *command, int channel_no) |
6579 | +{ |
6580 | + int retval; |
6581 | + static char *envp[] = { |
6582 | + "HOME=/", |
6583 | + "TERM=linux", |
6584 | + "PATH=/sbin:/usr/sbin:/bin:/usr/bin", |
6585 | + NULL }; |
6586 | + static char *argv[] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }; |
6587 | + char *channel = kmalloc(6, GFP_KERNEL); |
6588 | + int arg = 0, size; |
6589 | + char test_read[255]; |
6590 | + char *orig_posn = command; |
6591 | + |
6592 | + if (!strlen(orig_posn)) |
6593 | + return 1; |
6594 | + |
6595 | + /* Up to 7 args supported */ |
6596 | + while (arg < 7) { |
6597 | + sscanf(orig_posn, "%s", test_read); |
6598 | + size = strlen(test_read); |
6599 | + if (!(size)) |
6600 | + break; |
6601 | + argv[arg] = kmalloc(size + 1, GFP_ATOMIC); |
6602 | + strcpy(argv[arg], test_read); |
6603 | + orig_posn += size + 1; |
6604 | + *test_read = 0; |
6605 | + arg++; |
6606 | + } |
6607 | + |
6608 | + if (channel_no) { |
6609 | + sprintf(channel, "-c%d", channel_no); |
6610 | + argv[arg] = channel; |
6611 | + } else |
6612 | + arg--; |
6613 | + |
6614 | + retval = call_usermodehelper(argv[0], argv, envp, 0); |
6615 | + |
6616 | + if (retval) |
6617 | + printk("Failed to launch userspace program '%s': Error %d\n", |
6618 | + command, retval); |
6619 | + |
6620 | + { |
6621 | + int i; |
6622 | + for (i = 0; i < arg; i++) |
6623 | + if (argv[i] && argv[i] != channel) |
6624 | + kfree(argv[i]); |
6625 | + } |
6626 | + |
6627 | + kfree(channel); |
6628 | + |
6629 | + return retval; |
6630 | +} |
6631 | + |
6632 | +int suspend_netlink_setup(struct user_helper_data *uhd) |
6633 | +{ |
6634 | + if (netlink_prepare(uhd) < 0) { |
6635 | + printk("Netlink prepare failed.\n"); |
6636 | + return 1; |
6637 | + } |
6638 | + |
6639 | + if (suspend2_launch_userspace_program(uhd->program, uhd->netlink_id) < 0) { |
6640 | + printk("Launch userspace program failed.\n"); |
6641 | + suspend_netlink_close_complete(uhd); |
6642 | + return 1; |
6643 | + } |
6644 | + |
6645 | + /* Wait 2 seconds for the userspace process to make contact */ |
6646 | + wait_for_completion_timeout(&uhd->wait_for_process, 2*HZ); |
6647 | + |
6648 | + if (uhd->pid == -1) { |
6649 | + printk("%s: Failed to contact userspace process.\n", |
6650 | + uhd->name); |
6651 | + suspend_netlink_close_complete(uhd); |
6652 | + return 1; |
6653 | + } |
6654 | + |
6655 | + return 0; |
6656 | +} |
6657 | + |
6658 | +EXPORT_SYMBOL_GPL(suspend_netlink_setup); |
6659 | +EXPORT_SYMBOL_GPL(suspend_netlink_close); |
6660 | +EXPORT_SYMBOL_GPL(suspend_send_netlink_message); |
6661 | diff --git a/kernel/power/netlink.h b/kernel/power/netlink.h |
6662 | new file mode 100644 |
6663 | index 0000000..97647e8 |
6664 | --- /dev/null |
6665 | +++ b/kernel/power/netlink.h |
6666 | @@ -0,0 +1,58 @@ |
6667 | +/* |
6668 | + * kernel/power/netlink.h |
6669 | + * |
6670 | + * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
6671 | + * |
6672 | + * This file is released under the GPLv2. |
6673 | + * |
6674 | + * Declarations for functions for communicating with a userspace helper |
6675 | + * via netlink. |
6676 | + */ |
6677 | + |
6678 | +#include <linux/netlink.h> |
6679 | +#include <net/sock.h> |
6680 | + |
6681 | +#define NETLINK_MSG_BASE 0x10 |
6682 | + |
6683 | +#define NETLINK_MSG_READY 0x10 |
6684 | +#define NETLINK_MSG_NOFREEZE_ME 0x16 |
6685 | +#define NETLINK_MSG_GET_DEBUGGING 0x19 |
6686 | +#define NETLINK_MSG_CLEANUP 0x24 |
6687 | +#define NETLINK_MSG_NOFREEZE_ACK 0x27 |
6688 | +#define NETLINK_MSG_IS_DEBUGGING 0x28 |
6689 | + |
6690 | +struct user_helper_data { |
6691 | + int (*rcv_msg) (struct sk_buff *skb, struct nlmsghdr *nlh); |
6692 | + void (* not_ready) (void); |
6693 | + struct sock *nl; |
6694 | + u32 sock_seq; |
6695 | + pid_t pid; |
6696 | + char *comm; |
6697 | + char program[256]; |
6698 | + int pool_level; |
6699 | + int pool_limit; |
6700 | + struct sk_buff *emerg_skbs; |
6701 | + int skb_size; |
6702 | + int netlink_id; |
6703 | + char *name; |
6704 | + struct user_helper_data *next; |
6705 | + struct completion wait_for_process; |
6706 | + int interface_version; |
6707 | + int must_init; |
6708 | +}; |
6709 | + |
6710 | +#ifdef CONFIG_NET |
6711 | +int suspend_netlink_setup(struct user_helper_data *uhd); |
6712 | +void suspend_netlink_close(struct user_helper_data *uhd); |
6713 | +void suspend_send_netlink_message(struct user_helper_data *uhd, |
6714 | + int type, void* params, size_t len); |
6715 | +#else |
6716 | +static inline int suspend_netlink_setup(struct user_helper_data *uhd) |
6717 | +{ |
6718 | + return 0; |
6719 | +} |
6720 | + |
6721 | +static inline void suspend_netlink_close(struct user_helper_data *uhd) { }; |
6722 | +static inline void suspend_send_netlink_message(struct user_helper_data *uhd, |
6723 | + int type, void* params, size_t len) { }; |
6724 | +#endif |
6725 | diff --git a/kernel/power/pagedir.c b/kernel/power/pagedir.c |
6726 | new file mode 100644 |
6727 | index 0000000..4e74689 |
6728 | --- /dev/null |
6729 | +++ b/kernel/power/pagedir.c |
6730 | @@ -0,0 +1,480 @@ |
6731 | +/* |
6732 | + * kernel/power/pagedir.c |
6733 | + * |
6734 | + * Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu> |
6735 | + * Copyright (C) 1998,2001,2002 Pavel Machek <pavel@suse.cz> |
6736 | + * Copyright (C) 2002-2003 Florent Chabaud <fchabaud@free.fr> |
6737 | + * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net) |
6738 | + * |
6739 | + * This file is released under the GPLv2. |
6740 | + * |
6741 | + * Routines for handling pagesets. |
6742 | + * Note that pbes aren't actually stored as such. They're stored as |
6743 | + * bitmaps and extents. |
6744 | + */ |
6745 | + |
6746 | +#include <linux/suspend.h> |
6747 | +#include <linux/highmem.h> |
6748 | +#include <linux/bootmem.h> |
6749 | +#include <linux/hardirq.h> |
6750 | +#include <linux/sched.h> |
6751 | +#include <asm/tlbflush.h> |
6752 | + |
6753 | +#include "pageflags.h" |
6754 | +#include "ui.h" |
6755 | +#include "pagedir.h" |
6756 | +#include "prepare_image.h" |
6757 | +#include "suspend.h" |
6758 | +#include "power.h" |
6759 | +#include "suspend2_builtin.h" |
6760 | + |
6761 | +#define PAGESET1 0 |
6762 | +#define PAGESET2 1 |
6763 | + |
6764 | +static int ps2_pfn; |
6765 | + |
6766 | +/* |
6767 | + * suspend_mark_task_as_pageset |
6768 | + * Functionality : Marks all the saveable pages belonging to a given process |
6769 | + * as belonging to a particular pageset. |
6770 | + */ |
6771 | + |
6772 | +static void suspend_mark_task_as_pageset(struct task_struct *t, int pageset2) |
6773 | +{ |
6774 | + struct vm_area_struct *vma; |
6775 | + struct mm_struct *mm; |
6776 | + |
6777 | + mm = t->active_mm; |
6778 | + |
6779 | + if (!mm || !mm->mmap) return; |
6780 | + |
6781 | + if (!irqs_disabled()) |
6782 | + down_read(&mm->mmap_sem); |
6783 | + |
6784 | + for (vma = mm->mmap; vma; vma = vma->vm_next) { |
6785 | + unsigned long posn; |
6786 | + |
6787 | + if (vma->vm_flags & (VM_PFNMAP | VM_IO | VM_RESERVED)) { |
6788 | + printk("Skipping vma %p in process %d (%s) which has " |
6789 | + "VM_PFNMAP | VM_IO | VM_RESERVED (%lx).\n", vma, |
6790 | + t->pid, t->comm, vma->vm_flags); |
6791 | + continue; |
6792 | + } |
6793 | + |
6794 | + if (!vma->vm_start) |
6795 | + continue; |
6796 | + |
6797 | + for (posn = vma->vm_start; posn < vma->vm_end; |
6798 | + posn += PAGE_SIZE) { |
6799 | + struct page *page = follow_page(vma, posn, 0); |
6800 | + if (!page) |
6801 | + continue; |
6802 | + |
6803 | + if (pageset2) |
6804 | + SetPagePageset2(page); |
6805 | + else { |
6806 | + ClearPagePageset2(page); |
6807 | + SetPagePageset1(page); |
6808 | + } |
6809 | + } |
6810 | + } |
6811 | + |
6812 | + if (!irqs_disabled()) |
6813 | + up_read(&mm->mmap_sem); |
6814 | +} |
6815 | + |
6816 | +static void pageset2_full(void) |
6817 | +{ |
6818 | + struct zone *zone; |
6819 | + unsigned long flags; |
6820 | + |
6821 | + for_each_zone(zone) { |
6822 | + spin_lock_irqsave(&zone->lru_lock, flags); |
6823 | + if (zone_page_state(zone, NR_INACTIVE)) { |
6824 | + struct page *page; |
6825 | + list_for_each_entry(page, &zone->inactive_list, lru) |
6826 | + SetPagePageset2(page); |
6827 | + } |
6828 | + if (zone_page_state(zone, NR_ACTIVE)) { |
6829 | + struct page *page; |
6830 | + list_for_each_entry(page, &zone->active_list, lru) |
6831 | + SetPagePageset2(page); |
6832 | + } |
6833 | + spin_unlock_irqrestore(&zone->lru_lock, flags); |
6834 | + } |
6835 | +} |
6836 | + |
6837 | +/* mark_pages_for_pageset2 |
6838 | + * |
6839 | + * Description: Mark unshared pages in processes not needed for suspend as |
6840 | + * being able to be written out in a separate pagedir. |
6841 | + * HighMem pages are simply marked as pageset2. They won't be |
6842 | + * needed during suspend. |
6843 | + */ |
6844 | + |
6845 | +struct attention_list { |
6846 | + struct task_struct *task; |
6847 | + struct attention_list *next; |
6848 | +}; |
6849 | + |
6850 | +void suspend_mark_pages_for_pageset2(void) |
6851 | +{ |
6852 | + struct task_struct *p; |
6853 | + struct attention_list *attention_list = NULL, *last = NULL, *next; |
6854 | + int i, task_count = 0; |
6855 | + |
6856 | + if (test_action_state(SUSPEND_NO_PAGESET2)) |
6857 | + return; |
6858 | + |
6859 | + clear_dyn_pageflags(pageset2_map); |
6860 | + |
6861 | + if (test_action_state(SUSPEND_PAGESET2_FULL)) |
6862 | + pageset2_full(); |
6863 | + else { |
6864 | + read_lock(&tasklist_lock); |
6865 | + for_each_process(p) { |
6866 | + if (!p->mm || (p->flags & PF_BORROWED_MM)) |
6867 | + continue; |
6868 | + |
6869 | + suspend_mark_task_as_pageset(p, PAGESET2); |
6870 | + } |
6871 | + read_unlock(&tasklist_lock); |
6872 | + } |
6873 | + |
6874 | + /* |
6875 | + * Now we count all userspace process (with task->mm) marked PF_NOFREEZE. |
6876 | + */ |
6877 | + read_lock(&tasklist_lock); |
6878 | + for_each_process(p) |
6879 | + if ((p->flags & PF_NOFREEZE) || p == current) |
6880 | + task_count++; |
6881 | + read_unlock(&tasklist_lock); |
6882 | + |
6883 | + /* |
6884 | + * Allocate attention list structs. |
6885 | + */ |
6886 | + for (i = 0; i < task_count; i++) { |
6887 | + struct attention_list *this = |
6888 | + kmalloc(sizeof(struct attention_list), GFP_ATOMIC); |
6889 | + if (!this) { |
6890 | + printk("Failed to allocate slab for attention list.\n"); |
6891 | + set_result_state(SUSPEND_ABORTED); |
6892 | + goto free_attention_list; |
6893 | + } |
6894 | + this->next = NULL; |
6895 | + if (attention_list) { |
6896 | + last->next = this; |
6897 | + last = this; |
6898 | + } else |
6899 | + attention_list = last = this; |
6900 | + } |
6901 | + |
6902 | + next = attention_list; |
6903 | + read_lock(&tasklist_lock); |
6904 | + for_each_process(p) |
6905 | + if ((p->flags & PF_NOFREEZE) || p == current) { |
6906 | + next->task = p; |
6907 | + next = next->next; |
6908 | + } |
6909 | + read_unlock(&tasklist_lock); |
6910 | + |
6911 | + /* |
6912 | + * Because the tasks in attention_list are ones related to suspending, |
6913 | + * we know that they won't go away under us. |
6914 | + */ |
6915 | + |
6916 | +free_attention_list: |
6917 | + while (attention_list) { |
6918 | + if (!test_result_state(SUSPEND_ABORTED)) |
6919 | + suspend_mark_task_as_pageset(attention_list->task, PAGESET1); |
6920 | + last = attention_list; |
6921 | + attention_list = attention_list->next; |
6922 | + kfree(last); |
6923 | + } |
6924 | +} |
6925 | + |
6926 | +void suspend_reset_alt_image_pageset2_pfn(void) |
6927 | +{ |
6928 | + ps2_pfn = max_pfn + 1; |
6929 | +} |
6930 | + |
6931 | +static struct page *first_conflicting_page; |
6932 | + |
6933 | +/* |
6934 | + * free_conflicting_pages |
6935 | + */ |
6936 | + |
6937 | +void free_conflicting_pages(void) |
6938 | +{ |
6939 | + while (first_conflicting_page) { |
6940 | + struct page *next = *((struct page **) kmap(first_conflicting_page)); |
6941 | + kunmap(first_conflicting_page); |
6942 | + __free_page(first_conflicting_page); |
6943 | + first_conflicting_page = next; |
6944 | + } |
6945 | +} |
6946 | + |
6947 | +/* __suspend_get_nonconflicting_page |
6948 | + * |
6949 | + * Description: Gets order zero pages that won't be overwritten |
6950 | + * while copying the original pages. |
6951 | + */ |
6952 | + |
6953 | +struct page * ___suspend_get_nonconflicting_page(int can_be_highmem) |
6954 | +{ |
6955 | + struct page *page; |
6956 | + int flags = GFP_ATOMIC | __GFP_NOWARN | __GFP_ZERO; |
6957 | + if (can_be_highmem) |
6958 | + flags |= __GFP_HIGHMEM; |
6959 | + |
6960 | + |
6961 | + if (test_suspend_state(SUSPEND_LOADING_ALT_IMAGE) && pageset2_map && |
6962 | + (ps2_pfn < (max_pfn + 2))) { |
6963 | + /* |
6964 | + * ps2_pfn = max_pfn + 1 when yet to find first ps2 pfn that can |
6965 | + * be used. |
6966 | + * = 0..max_pfn when going through list. |
6967 | + * = max_pfn + 2 when gone through whole list. |
6968 | + */ |
6969 | + do { |
6970 | + ps2_pfn = get_next_bit_on(pageset2_map, ps2_pfn); |
6971 | + if (ps2_pfn <= max_pfn) { |
6972 | + page = pfn_to_page(ps2_pfn); |
6973 | + if (!PagePageset1(page) && |
6974 | + (can_be_highmem || !PageHighMem(page))) |
6975 | + return page; |
6976 | + } else |
6977 | + ps2_pfn++; |
6978 | + } while (ps2_pfn < max_pfn); |
6979 | + } |
6980 | + |
6981 | + do { |
6982 | + page = alloc_pages(flags, 0); |
6983 | + if (!page) { |
6984 | + printk("Failed to get nonconflicting page.\n"); |
6985 | + return 0; |
6986 | + } |
6987 | + if (PagePageset1(page)) { |
6988 | + struct page **next = (struct page **) kmap(page); |
6989 | + *next = first_conflicting_page; |
6990 | + first_conflicting_page = page; |
6991 | + kunmap(page); |
6992 | + } |
6993 | + } while(PagePageset1(page)); |
6994 | + |
6995 | + return page; |
6996 | +} |
6997 | + |
6998 | +unsigned long __suspend_get_nonconflicting_page(void) |
6999 | +{ |
7000 | + struct page *page = ___suspend_get_nonconflicting_page(0); |
7001 | + return page ? (unsigned long) page_address(page) : 0; |
7002 | +} |
7003 | + |
7004 | +struct pbe *get_next_pbe(struct page **page_ptr, struct pbe *this_pbe, int highmem) |
7005 | +{ |
7006 | + if (((((unsigned long) this_pbe) & (PAGE_SIZE - 1)) |
7007 | + + 2 * sizeof(struct pbe)) > PAGE_SIZE) { |
7008 | + struct page *new_page = |
7009 | + ___suspend_get_nonconflicting_page(highmem); |
7010 | + if (!new_page) |
7011 | + return ERR_PTR(-ENOMEM); |
7012 | + this_pbe = (struct pbe *) kmap(new_page); |
7013 | + memset(this_pbe, 0, PAGE_SIZE); |
7014 | + *page_ptr = new_page; |
7015 | + } else |
7016 | + this_pbe++; |
7017 | + |
7018 | + return this_pbe; |
7019 | +} |
7020 | + |
7021 | +/* get_pageset1_load_addresses |
7022 | + * |
7023 | + * Description: We check here that pagedir & pages it points to won't collide |
7024 | + * with pages where we're going to restore from the loaded pages |
7025 | + * later. |
7026 | + * Returns: Zero on success, one if couldn't find enough pages (shouldn't |
7027 | + * happen). |
7028 | + */ |
7029 | + |
7030 | +int suspend_get_pageset1_load_addresses(void) |
7031 | +{ |
7032 | + int pfn, highallocd = 0, lowallocd = 0; |
7033 | + int low_needed = pagedir1.size - get_highmem_size(pagedir1); |
7034 | + int high_needed = get_highmem_size(pagedir1); |
7035 | + int low_pages_for_highmem = 0; |
7036 | + unsigned long flags = GFP_ATOMIC | __GFP_NOWARN | __GFP_HIGHMEM; |
7037 | + struct page *page, *high_pbe_page = NULL, *last_high_pbe_page = NULL, |
7038 | + *low_pbe_page; |
7039 | + struct pbe **last_low_pbe_ptr = &restore_pblist, |
7040 | + **last_high_pbe_ptr = &restore_highmem_pblist, |
7041 | + *this_low_pbe = NULL, *this_high_pbe = NULL; |
7042 | + int orig_low_pfn = max_pfn + 1, orig_high_pfn = max_pfn + 1; |
7043 | + int high_pbes_done=0, low_pbes_done=0; |
7044 | + int low_direct = 0, high_direct = 0; |
7045 | + int high_to_free, low_to_free; |
7046 | + |
7047 | + /* First, allocate pages for the start of our pbe lists. */ |
7048 | + if (high_needed) { |
7049 | + high_pbe_page = ___suspend_get_nonconflicting_page(1); |
7050 | + if (!high_pbe_page) |
7051 | + return 1; |
7052 | + this_high_pbe = (struct pbe *) kmap(high_pbe_page); |
7053 | + memset(this_high_pbe, 0, PAGE_SIZE); |
7054 | + } |
7055 | + |
7056 | + low_pbe_page = ___suspend_get_nonconflicting_page(0); |
7057 | + if (!low_pbe_page) |
7058 | + return 1; |
7059 | + this_low_pbe = (struct pbe *) page_address(low_pbe_page); |
7060 | + |
7061 | + /* |
7062 | + * Next, allocate all possible memory to find where we can |
7063 | + * load data directly into destination pages. I'd like to do |
7064 | + * this in bigger chunks, but then we can't free pages |
7065 | + * individually later. |
7066 | + */ |
7067 | + |
7068 | + do { |
7069 | + page = alloc_pages(flags, 0); |
7070 | + if (page) |
7071 | + SetPagePageset1Copy(page); |
7072 | + } while (page); |
7073 | + |
7074 | + /* |
7075 | + * Find out how many high- and lowmem pages we allocated above, |
7076 | + * and how many pages we can reload directly to their original |
7077 | + * location. |
7078 | + */ |
7079 | + BITMAP_FOR_EACH_SET(pageset1_copy_map, pfn) { |
7080 | + int is_high; |
7081 | + page = pfn_to_page(pfn); |
7082 | + is_high = PageHighMem(page); |
7083 | + |
7084 | + if (PagePageset1(page)) { |
7085 | + if (test_action_state(SUSPEND_NO_DIRECT_LOAD)) { |
7086 | + ClearPagePageset1Copy(page); |
7087 | + __free_page(page); |
7088 | + continue; |
7089 | + } else { |
7090 | + if (is_high) |
7091 | + high_direct++; |
7092 | + else |
7093 | + low_direct++; |
7094 | + } |
7095 | + } else { |
7096 | + if (is_high) |
7097 | + highallocd++; |
7098 | + else |
7099 | + lowallocd++; |
7100 | + } |
7101 | + } |
7102 | + |
7103 | + high_needed-= high_direct; |
7104 | + low_needed-= low_direct; |
7105 | + |
7106 | + /* |
7107 | + * Do we need to use some lowmem pages for the copies of highmem |
7108 | + * pages? |
7109 | + */ |
7110 | + if (high_needed > highallocd) { |
7111 | + low_pages_for_highmem = high_needed - highallocd; |
7112 | + high_needed -= low_pages_for_highmem; |
7113 | + low_needed += low_pages_for_highmem; |
7114 | + } |
7115 | + |
7116 | + high_to_free = highallocd - high_needed; |
7117 | + low_to_free = lowallocd - low_needed; |
7118 | + |
7119 | + /* |
7120 | + * Now generate our pbes (which will be used for the atomic restore, |
7121 | + * and free unneeded pages. |
7122 | + */ |
7123 | + BITMAP_FOR_EACH_SET(pageset1_copy_map, pfn) { |
7124 | + int is_high; |
7125 | + page = pfn_to_page(pfn); |
7126 | + is_high = PageHighMem(page); |
7127 | + |
7128 | + if (PagePageset1(page)) |
7129 | + continue; |
7130 | + |
7131 | + /* Free the page? */ |
7132 | + if ((is_high && high_to_free) || |
7133 | + (!is_high && low_to_free)) { |
7134 | + ClearPagePageset1Copy(page); |
7135 | + __free_page(page); |
7136 | + if (is_high) |
7137 | + high_to_free--; |
7138 | + else |
7139 | + low_to_free--; |
7140 | + continue; |
7141 | + } |
7142 | + |
7143 | + /* Nope. We're going to use this page. Add a pbe. */ |
7144 | + if (is_high || low_pages_for_highmem) { |
7145 | + struct page *orig_page; |
7146 | + high_pbes_done++; |
7147 | + if (!is_high) |
7148 | + low_pages_for_highmem--; |
7149 | + do { |
7150 | + orig_high_pfn = get_next_bit_on(pageset1_map, |
7151 | + orig_high_pfn); |
7152 | + BUG_ON(orig_high_pfn > max_pfn); |
7153 | + orig_page = pfn_to_page(orig_high_pfn); |
7154 | + } while(!PageHighMem(orig_page) || load_direct(orig_page)); |
7155 | + |
7156 | + this_high_pbe->orig_address = orig_page; |
7157 | + this_high_pbe->address = page; |
7158 | + this_high_pbe->next = NULL; |
7159 | + if (last_high_pbe_page != high_pbe_page) { |
7160 | + *last_high_pbe_ptr = (struct pbe *) high_pbe_page; |
7161 | + if (!last_high_pbe_page) |
7162 | + last_high_pbe_page = high_pbe_page; |
7163 | + } else |
7164 | + *last_high_pbe_ptr = this_high_pbe; |
7165 | + last_high_pbe_ptr = &this_high_pbe->next; |
7166 | + if (last_high_pbe_page != high_pbe_page) { |
7167 | + kunmap(last_high_pbe_page); |
7168 | + last_high_pbe_page = high_pbe_page; |
7169 | + } |
7170 | + this_high_pbe = get_next_pbe(&high_pbe_page, this_high_pbe, 1); |
7171 | + if (IS_ERR(this_high_pbe)) { |
7172 | + printk("This high pbe is an error.\n"); |
7173 | + return -ENOMEM; |
7174 | + } |
7175 | + } else { |
7176 | + struct page *orig_page; |
7177 | + low_pbes_done++; |
7178 | + do { |
7179 | + orig_low_pfn = get_next_bit_on(pageset1_map, |
7180 | + orig_low_pfn); |
7181 | + BUG_ON(orig_low_pfn > max_pfn); |
7182 | + orig_page = pfn_to_page(orig_low_pfn); |
7183 | + } while(PageHighMem(orig_page) || load_direct(orig_page)); |
7184 | + |
7185 | + this_low_pbe->orig_address = page_address(orig_page); |
7186 | + this_low_pbe->address = page_address(page); |
7187 | + this_low_pbe->next = NULL; |
7188 | + *last_low_pbe_ptr = this_low_pbe; |
7189 | + last_low_pbe_ptr = &this_low_pbe->next; |
7190 | + this_low_pbe = get_next_pbe(&low_pbe_page, this_low_pbe, 0); |
7191 | + if (IS_ERR(this_low_pbe)) { |
7192 | + printk("this_low_pbe is an error.\n"); |
7193 | + return -ENOMEM; |
7194 | + } |
7195 | + } |
7196 | + } |
7197 | + |
7198 | + if (high_pbe_page) |
7199 | + kunmap(high_pbe_page); |
7200 | + |
7201 | + if (last_high_pbe_page != high_pbe_page) { |
7202 | + if (last_high_pbe_page) |
7203 | + kunmap(last_high_pbe_page); |
7204 | + __free_page(high_pbe_page); |
7205 | + } |
7206 | + |
7207 | + free_conflicting_pages(); |
7208 | + |
7209 | + return 0; |
7210 | +} |
7211 | diff --git a/kernel/power/pagedir.h b/kernel/power/pagedir.h |
7212 | new file mode 100644 |
7213 | index 0000000..2ae395f |
7214 | --- /dev/null |
7215 | +++ b/kernel/power/pagedir.h |
7216 | @@ -0,0 +1,51 @@ |
7217 | +/* |
7218 | + * kernel/power/pagedir.h |
7219 | + * |
7220 | + * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net) |
7221 | + * |
7222 | + * This file is released under the GPLv2. |
7223 | + * |
7224 | + * Declarations for routines for handling pagesets. |
7225 | + */ |
7226 | + |
7227 | +#ifndef KERNEL_POWER_PAGEDIR_H |
7228 | +#define KERNEL_POWER_PAGEDIR_H |
7229 | + |
7230 | +/* Pagedir |
7231 | + * |
7232 | + * Contains the metadata for a set of pages saved in the image. |
7233 | + */ |
7234 | + |
7235 | +struct pagedir { |
7236 | + int id; |
7237 | + int size; |
7238 | +#ifdef CONFIG_HIGHMEM |
7239 | + int size_high; |
7240 | +#endif |
7241 | +}; |
7242 | + |
7243 | +#ifdef CONFIG_HIGHMEM |
7244 | +#define get_highmem_size(pagedir) (pagedir.size_high) |
7245 | +#define set_highmem_size(pagedir, sz) do { pagedir.size_high = sz; } while(0) |
7246 | +#define inc_highmem_size(pagedir) do { pagedir.size_high++; } while(0) |
7247 | +#define get_lowmem_size(pagedir) (pagedir.size - pagedir.size_high) |
7248 | +#else |
7249 | +#define get_highmem_size(pagedir) (0) |
7250 | +#define set_highmem_size(pagedir, sz) do { } while(0) |
7251 | +#define inc_highmem_size(pagedir) do { } while(0) |
7252 | +#define get_lowmem_size(pagedir) (pagedir.size) |
7253 | +#endif |
7254 | + |
7255 | +extern struct pagedir pagedir1, pagedir2; |
7256 | + |
7257 | +extern void suspend_copy_pageset1(void); |
7258 | + |
7259 | +extern void suspend_mark_pages_for_pageset2(void); |
7260 | + |
7261 | +extern int suspend_get_pageset1_load_addresses(void); |
7262 | + |
7263 | +extern unsigned long __suspend_get_nonconflicting_page(void); |
7264 | +struct page * ___suspend_get_nonconflicting_page(int can_be_highmem); |
7265 | + |
7266 | +extern void suspend_reset_alt_image_pageset2_pfn(void); |
7267 | +#endif |
7268 | diff --git a/kernel/power/pageflags.c b/kernel/power/pageflags.c |
7269 | new file mode 100644 |
7270 | index 0000000..dccac97 |
7271 | --- /dev/null |
7272 | +++ b/kernel/power/pageflags.c |
7273 | @@ -0,0 +1,149 @@ |
7274 | +/* |
7275 | + * kernel/power/pageflags.c |
7276 | + * |
7277 | + * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
7278 | + * |
7279 | + * This file is released under the GPLv2. |
7280 | + * |
7281 | + * Routines for serialising and relocating pageflags in which we |
7282 | + * store our image metadata. |
7283 | + */ |
7284 | + |
7285 | +#include <linux/kernel.h> |
7286 | +#include <linux/mm.h> |
7287 | +#include <linux/module.h> |
7288 | +#include <linux/bitops.h> |
7289 | +#include <linux/list.h> |
7290 | +#include <linux/suspend.h> |
7291 | +#include "pageflags.h" |
7292 | +#include "modules.h" |
7293 | +#include "pagedir.h" |
7294 | +#include "suspend.h" |
7295 | + |
7296 | +dyn_pageflags_t pageset2_map; |
7297 | +dyn_pageflags_t page_resave_map; |
7298 | +dyn_pageflags_t io_map; |
7299 | + |
7300 | +static int pages_for_zone(struct zone *zone) |
7301 | +{ |
7302 | + return DIV_ROUND_UP(zone->spanned_pages, (PAGE_SIZE << 3)); |
7303 | +} |
7304 | + |
7305 | +int suspend_pageflags_space_needed(void) |
7306 | +{ |
7307 | + int total = 0; |
7308 | + struct zone *zone; |
7309 | + |
7310 | + for_each_zone(zone) |
7311 | + if (populated_zone(zone)) |
7312 | + total += sizeof(int) * 3 + pages_for_zone(zone) * PAGE_SIZE; |
7313 | + |
7314 | + total += sizeof(int); |
7315 | + |
7316 | + return total; |
7317 | +} |
7318 | + |
7319 | +/* save_dyn_pageflags |
7320 | + * |
7321 | + * Description: Save a set of pageflags. |
7322 | + * Arguments: dyn_pageflags_t *: Pointer to the bitmap being saved. |
7323 | + */ |
7324 | + |
7325 | +void save_dyn_pageflags(dyn_pageflags_t pagemap) |
7326 | +{ |
7327 | + int i, zone_idx, size, node = 0; |
7328 | + struct zone *zone; |
7329 | + struct pglist_data *pgdat; |
7330 | + |
7331 | + if (!*pagemap) |
7332 | + return; |
7333 | + |
7334 | + for_each_online_pgdat(pgdat) { |
7335 | + for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) { |
7336 | + zone = &pgdat->node_zones[zone_idx]; |
7337 | + |
7338 | + if (!populated_zone(zone)) |
7339 | + continue; |
7340 | + |
7341 | + suspendActiveAllocator->rw_header_chunk(WRITE, NULL, |
7342 | + (char *) &node, sizeof(int)); |
7343 | + suspendActiveAllocator->rw_header_chunk(WRITE, NULL, |
7344 | + (char *) &zone_idx, sizeof(int)); |
7345 | + size = pages_for_zone(zone); |
7346 | + suspendActiveAllocator->rw_header_chunk(WRITE, NULL, |
7347 | + (char *) &size, sizeof(int)); |
7348 | + |
7349 | + for (i = 0; i < size; i++) |
7350 | + suspendActiveAllocator->rw_header_chunk(WRITE, |
7351 | + NULL, (char *) pagemap[node][zone_idx][i], |
7352 | + PAGE_SIZE); |
7353 | + } |
7354 | + node++; |
7355 | + } |
7356 | + node = -1; |
7357 | + suspendActiveAllocator->rw_header_chunk(WRITE, NULL, |
7358 | + (char *) &node, sizeof(int)); |
7359 | +} |
7360 | + |
7361 | +/* load_dyn_pageflags |
7362 | + * |
7363 | + * Description: Load a set of pageflags. |
7364 | + * Arguments: dyn_pageflags_t *: Pointer to the bitmap being loaded. |
7365 | + * (It must be allocated before calling this routine). |
7366 | + */ |
7367 | + |
7368 | +int load_dyn_pageflags(dyn_pageflags_t pagemap) |
7369 | +{ |
7370 | + int i, zone_idx, zone_check = 0, size, node = 0; |
7371 | + struct zone *zone; |
7372 | + struct pglist_data *pgdat; |
7373 | + |
7374 | + if (!pagemap) |
7375 | + return 1; |
7376 | + |
7377 | + for_each_online_pgdat(pgdat) { |
7378 | + for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) { |
7379 | + zone = &pgdat->node_zones[zone_idx]; |
7380 | + |
7381 | + if (!populated_zone(zone)) |
7382 | + continue; |
7383 | + |
7384 | + /* Same node? */ |
7385 | + suspendActiveAllocator->rw_header_chunk(READ, NULL, |
7386 | + (char *) &zone_check, sizeof(int)); |
7387 | + if (zone_check != node) { |
7388 | + printk("Node read (%d) != node (%d).\n", |
7389 | + zone_check, node); |
7390 | + return 1; |
7391 | + } |
7392 | + |
7393 | + /* Same zone? */ |
7394 | + suspendActiveAllocator->rw_header_chunk(READ, NULL, |
7395 | + (char *) &zone_check, sizeof(int)); |
7396 | + if (zone_check != zone_idx) { |
7397 | + printk("Zone read (%d) != node (%d).\n", |
7398 | + zone_check, zone_idx); |
7399 | + return 1; |
7400 | + } |
7401 | + |
7402 | + |
7403 | + suspendActiveAllocator->rw_header_chunk(READ, NULL, |
7404 | + (char *) &size, sizeof(int)); |
7405 | + |
7406 | + for (i = 0; i < size; i++) |
7407 | + suspendActiveAllocator->rw_header_chunk(READ, NULL, |
7408 | + (char *) pagemap[node][zone_idx][i], |
7409 | + PAGE_SIZE); |
7410 | + } |
7411 | + node++; |
7412 | + } |
7413 | + suspendActiveAllocator->rw_header_chunk(READ, NULL, (char *) &zone_check, |
7414 | + sizeof(int)); |
7415 | + if (zone_check != -1) { |
7416 | + printk("Didn't read end of dyn pageflag data marker.(%x)\n", |
7417 | + zone_check); |
7418 | + return 1; |
7419 | + } |
7420 | + |
7421 | + return 0; |
7422 | +} |
7423 | diff --git a/kernel/power/pageflags.h b/kernel/power/pageflags.h |
7424 | new file mode 100644 |
7425 | index 0000000..405cbce |
7426 | --- /dev/null |
7427 | +++ b/kernel/power/pageflags.h |
7428 | @@ -0,0 +1,49 @@ |
7429 | +/* |
7430 | + * kernel/power/pageflags.h |
7431 | + * |
7432 | + * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
7433 | + * |
7434 | + * This file is released under the GPLv2. |
7435 | + * |
7436 | + * Suspend2 needs a few pageflags while working that aren't otherwise |
7437 | + * used. To save the struct page pageflags, we dynamically allocate |
7438 | + * a bitmap and use that. These are the only non order-0 allocations |
7439 | + * we do. |
7440 | + * |
7441 | + * NOTE!!! |
7442 | + * We assume that PAGE_SIZE - sizeof(void *) is a multiple of |
7443 | + * sizeof(unsigned long). Is this ever false? |
7444 | + */ |
7445 | + |
7446 | +#include <linux/dyn_pageflags.h> |
7447 | +#include <linux/suspend.h> |
7448 | + |
7449 | +extern dyn_pageflags_t pageset1_map; |
7450 | +extern dyn_pageflags_t pageset1_copy_map; |
7451 | +extern dyn_pageflags_t pageset2_map; |
7452 | +extern dyn_pageflags_t page_resave_map; |
7453 | +extern dyn_pageflags_t io_map; |
7454 | + |
7455 | +#define PagePageset1(page) (test_dynpageflag(&pageset1_map, page)) |
7456 | +#define SetPagePageset1(page) (set_dynpageflag(&pageset1_map, page)) |
7457 | +#define ClearPagePageset1(page) (clear_dynpageflag(&pageset1_map, page)) |
7458 | + |
7459 | +#define PagePageset1Copy(page) (test_dynpageflag(&pageset1_copy_map, page)) |
7460 | +#define SetPagePageset1Copy(page) (set_dynpageflag(&pageset1_copy_map, page)) |
7461 | +#define ClearPagePageset1Copy(page) (clear_dynpageflag(&pageset1_copy_map, page)) |
7462 | + |
7463 | +#define PagePageset2(page) (test_dynpageflag(&pageset2_map, page)) |
7464 | +#define SetPagePageset2(page) (set_dynpageflag(&pageset2_map, page)) |
7465 | +#define ClearPagePageset2(page) (clear_dynpageflag(&pageset2_map, page)) |
7466 | + |
7467 | +#define PageWasRW(page) (test_dynpageflag(&pageset2_map, page)) |
7468 | +#define SetPageWasRW(page) (set_dynpageflag(&pageset2_map, page)) |
7469 | +#define ClearPageWasRW(page) (clear_dynpageflag(&pageset2_map, page)) |
7470 | + |
7471 | +#define PageResave(page) (page_resave_map ? test_dynpageflag(&page_resave_map, page) : 0) |
7472 | +#define SetPageResave(page) (set_dynpageflag(&page_resave_map, page)) |
7473 | +#define ClearPageResave(page) (clear_dynpageflag(&page_resave_map, page)) |
7474 | + |
7475 | +extern void save_dyn_pageflags(dyn_pageflags_t pagemap); |
7476 | +extern int load_dyn_pageflags(dyn_pageflags_t pagemap); |
7477 | +extern int suspend_pageflags_space_needed(void); |
7478 | diff --git a/kernel/power/power.h b/kernel/power/power.h |
7479 | index eb461b8..a4d6550 100644 |
7480 | --- a/kernel/power/power.h |
7481 | +++ b/kernel/power/power.h |
7482 | @@ -1,5 +1,11 @@ |
7483 | +/* |
7484 | + * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
7485 | + */ |
7486 | + |
7487 | #include <linux/suspend.h> |
7488 | #include <linux/utsname.h> |
7489 | +#include "suspend.h" |
7490 | +#include "suspend2_builtin.h" |
7491 | |
7492 | struct swsusp_info { |
7493 | struct new_utsname uts; |
7494 | @@ -15,11 +21,15 @@ struct swsusp_info { |
7495 | |
7496 | #ifdef CONFIG_SOFTWARE_SUSPEND |
7497 | extern int pm_suspend_disk(void); |
7498 | - |
7499 | +extern char resume_file[256]; |
7500 | #else |
7501 | static inline int pm_suspend_disk(void) |
7502 | { |
7503 | - return -EPERM; |
7504 | +#ifdef CONFIG_SUSPEND2 |
7505 | + return suspend2_try_suspend(1); |
7506 | +#else |
7507 | + return -ENODEV; |
7508 | +#endif |
7509 | } |
7510 | #endif |
7511 | |
7512 | @@ -40,6 +50,8 @@ extern struct subsystem power_subsys; |
7513 | /* References to section boundaries */ |
7514 | extern const void __nosave_begin, __nosave_end; |
7515 | |
7516 | +extern struct pbe *restore_pblist; |
7517 | + |
7518 | /* Preferred image size in bytes (default 500 MB) */ |
7519 | extern unsigned long image_size; |
7520 | extern int in_suspend; |
7521 | @@ -177,3 +189,11 @@ extern int suspend_enter(suspend_state_t state); |
7522 | struct timeval; |
7523 | extern void swsusp_show_speed(struct timeval *, struct timeval *, |
7524 | unsigned int, char *); |
7525 | +extern struct page *saveable_page(unsigned long pfn); |
7526 | +#ifdef CONFIG_HIGHMEM |
7527 | +extern struct page *saveable_highmem_page(unsigned long pfn); |
7528 | +#else |
7529 | +static inline void *saveable_highmem_page(unsigned long pfn) { return NULL; } |
7530 | +#endif |
7531 | + |
7532 | +#define PBES_PER_PAGE (PAGE_SIZE / sizeof(struct pbe)) |
7533 | diff --git a/kernel/power/power_off.c b/kernel/power/power_off.c |
7534 | new file mode 100644 |
7535 | index 0000000..7db6186 |
7536 | --- /dev/null |
7537 | +++ b/kernel/power/power_off.c |
7538 | @@ -0,0 +1,109 @@ |
7539 | +/* |
7540 | + * kernel/power/power_off.c |
7541 | + * |
7542 | + * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net) |
7543 | + * |
7544 | + * This file is released under the GPLv2. |
7545 | + * |
7546 | + * Support for powering down. |
7547 | + */ |
7548 | + |
7549 | +#include <linux/device.h> |
7550 | +#include <linux/suspend.h> |
7551 | +#include <linux/mm.h> |
7552 | +#include <linux/pm.h> |
7553 | +#include <linux/reboot.h> |
7554 | +#include <linux/cpu.h> |
7555 | +#include <linux/console.h> |
7556 | +#include "suspend.h" |
7557 | +#include "ui.h" |
7558 | +#include "power_off.h" |
7559 | +#include "power.h" |
7560 | + |
7561 | +unsigned long suspend2_poweroff_method = 0; /* 0 - Kernel power off */ |
7562 | + |
7563 | +/* |
7564 | + * suspend2_power_down |
7565 | + * Functionality : Powers down or reboots the computer once the image |
7566 | + * has been written to disk. |
7567 | + * Key Assumptions : Able to reboot/power down via code called or that |
7568 | + * the warning emitted if the calls fail will be visible |
7569 | + * to the user (ie printk resumes devices). |
7570 | + * Called From : do_suspend2_suspend_2 |
7571 | + */ |
7572 | + |
7573 | +void suspend2_power_down(void) |
7574 | +{ |
7575 | + int result = 0; |
7576 | + |
7577 | + if (test_action_state(SUSPEND_REBOOT)) { |
7578 | + suspend_prepare_status(DONT_CLEAR_BAR, "Ready to reboot."); |
7579 | + kernel_restart(NULL); |
7580 | + } |
7581 | + |
7582 | + suspend_prepare_status(DONT_CLEAR_BAR, "Powering down."); |
7583 | + |
7584 | + switch (suspend2_poweroff_method) { |
7585 | + case 0: |
7586 | + break; |
7587 | + case 3: |
7588 | + suspend_console(); |
7589 | + |
7590 | + if (device_suspend(PMSG_SUSPEND)) { |
7591 | + suspend_prepare_status(DONT_CLEAR_BAR, "Device " |
7592 | + "suspend failure. Doing poweroff."); |
7593 | + goto ResumeConsole; |
7594 | + } |
7595 | + |
7596 | + if (!pm_ops || |
7597 | + (pm_ops->prepare && pm_ops->prepare(PM_SUSPEND_MEM))) |
7598 | + goto DeviceResume; |
7599 | + |
7600 | + if (test_action_state(SUSPEND_LATE_CPU_HOTPLUG) && |
7601 | + disable_nonboot_cpus()) |
7602 | + goto PmOpsFinish; |
7603 | + |
7604 | + if (!suspend_enter(PM_SUSPEND_MEM)) |
7605 | + result = 1; |
7606 | + |
7607 | + if (test_action_state(SUSPEND_LATE_CPU_HOTPLUG)) |
7608 | + enable_nonboot_cpus(); |
7609 | + |
7610 | +PmOpsFinish: |
7611 | + if (pm_ops->finish) |
7612 | + pm_ops->finish(PM_SUSPEND_MEM); |
7613 | + |
7614 | +DeviceResume: |
7615 | + device_resume(); |
7616 | + |
7617 | +ResumeConsole: |
7618 | + resume_console(); |
7619 | + |
7620 | + /* If suspended to ram and later woke. */ |
7621 | + if (result) |
7622 | + return; |
7623 | + break; |
7624 | + case 4: |
7625 | + case 5: |
7626 | + if (!pm_ops || |
7627 | + (pm_ops->prepare && pm_ops->prepare(PM_SUSPEND_MAX))) |
7628 | + break; |
7629 | + |
7630 | + kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK); |
7631 | + suspend_enter(suspend2_poweroff_method); |
7632 | + |
7633 | + /* Failed. Fall back to kernel_power_off etc. */ |
7634 | + if (pm_ops->finish) |
7635 | + pm_ops->finish(PM_SUSPEND_MAX); |
7636 | + } |
7637 | + |
7638 | + suspend_prepare_status(DONT_CLEAR_BAR, "Falling back to alternate power off method."); |
7639 | + kernel_power_off(); |
7640 | + kernel_halt(); |
7641 | + suspend_prepare_status(DONT_CLEAR_BAR, "Powerdown failed."); |
7642 | + while (1) |
7643 | + cpu_relax(); |
7644 | +} |
7645 | + |
7646 | +EXPORT_SYMBOL_GPL(suspend2_poweroff_method); |
7647 | +EXPORT_SYMBOL_GPL(suspend2_power_down); |
7648 | diff --git a/kernel/power/power_off.h b/kernel/power/power_off.h |
7649 | new file mode 100644 |
7650 | index 0000000..40e0c46 |
7651 | --- /dev/null |
7652 | +++ b/kernel/power/power_off.h |
7653 | @@ -0,0 +1,13 @@ |
7654 | +/* |
7655 | + * kernel/power/power_off.h |
7656 | + * |
7657 | + * Copyright (C) 2006-2007 Nigel Cunningham (nigel at suspend2 net) |
7658 | + * |
7659 | + * This file is released under the GPLv2. |
7660 | + * |
7661 | + * Support for the powering down. |
7662 | + */ |
7663 | + |
7664 | +int suspend_pm_state_finish(void); |
7665 | +void suspend2_power_down(void); |
7666 | +extern unsigned long suspend2_poweroff_method; |
7667 | diff --git a/kernel/power/prepare_image.c b/kernel/power/prepare_image.c |
7668 | new file mode 100644 |
7669 | index 0000000..779341b |
7670 | --- /dev/null |
7671 | +++ b/kernel/power/prepare_image.c |
7672 | @@ -0,0 +1,798 @@ |
7673 | +/* |
7674 | + * kernel/power/prepare_image.c |
7675 | + * |
7676 | + * Copyright (C) 2003-2007 Nigel Cunningham (nigel at suspend2 net) |
7677 | + * |
7678 | + * This file is released under the GPLv2. |
7679 | + * |
7680 | + * We need to eat memory until we can: |
7681 | + * 1. Perform the save without changing anything (RAM_NEEDED < #pages) |
7682 | + * 2. Fit it all in available space (suspendActiveAllocator->available_space() >= |
7683 | + * main_storage_needed()) |
7684 | + * 3. Reload the pagedir and pageset1 to places that don't collide with their |
7685 | + * final destinations, not knowing to what extent the resumed kernel will |
7686 | + * overlap with the one loaded at boot time. I think the resumed kernel |
7687 | + * should overlap completely, but I don't want to rely on this as it is |
7688 | + * an unproven assumption. We therefore assume there will be no overlap at |
7689 | + * all (worse case). |
7690 | + * 4. Meet the user's requested limit (if any) on the size of the image. |
7691 | + * The limit is in MB, so pages/256 (assuming 4K pages). |
7692 | + * |
7693 | + */ |
7694 | + |
7695 | +#include <linux/module.h> |
7696 | +#include <linux/highmem.h> |
7697 | +#include <linux/freezer.h> |
7698 | +#include <linux/hardirq.h> |
7699 | +#include <linux/mmzone.h> |
7700 | +#include <linux/console.h> |
7701 | + |
7702 | +#include "pageflags.h" |
7703 | +#include "modules.h" |
7704 | +#include "io.h" |
7705 | +#include "ui.h" |
7706 | +#include "extent.h" |
7707 | +#include "prepare_image.h" |
7708 | +#include "block_io.h" |
7709 | +#include "suspend.h" |
7710 | +#include "checksum.h" |
7711 | +#include "sysfs.h" |
7712 | + |
7713 | +static int num_nosave = 0; |
7714 | +static int header_space_allocated = 0; |
7715 | +static int main_storage_allocated = 0; |
7716 | +static int storage_available = 0; |
7717 | +int extra_pd1_pages_allowance = MIN_EXTRA_PAGES_ALLOWANCE; |
7718 | +int image_size_limit = 0; |
7719 | + |
7720 | +/* |
7721 | + * The atomic copy of pageset1 is stored in pageset2 pages. |
7722 | + * But if pageset1 is larger (normally only just after boot), |
7723 | + * we need to allocate extra pages to store the atomic copy. |
7724 | + * The following data struct and functions are used to handle |
7725 | + * the allocation and freeing of that memory. |
7726 | + */ |
7727 | + |
7728 | +static int extra_pages_allocated; |
7729 | + |
7730 | +struct extras { |
7731 | + struct page *page; |
7732 | + int order; |
7733 | + struct extras *next; |
7734 | +}; |
7735 | + |
7736 | +static struct extras *extras_list; |
7737 | + |
7738 | +/* suspend_free_extra_pagedir_memory |
7739 | + * |
7740 | + * Description: Free previously allocated extra pagedir memory. |
7741 | + */ |
7742 | +void suspend_free_extra_pagedir_memory(void) |
7743 | +{ |
7744 | + /* Free allocated pages */ |
7745 | + while (extras_list) { |
7746 | + struct extras *this = extras_list; |
7747 | + int i; |
7748 | + |
7749 | + extras_list = this->next; |
7750 | + |
7751 | + for (i = 0; i < (1 << this->order); i++) |
7752 | + ClearPageNosave(this->page + i); |
7753 | + |
7754 | + __free_pages(this->page, this->order); |
7755 | + kfree(this); |
7756 | + } |
7757 | + |
7758 | + extra_pages_allocated = 0; |
7759 | +} |
7760 | + |
7761 | +/* suspend_allocate_extra_pagedir_memory |
7762 | + * |
7763 | + * Description: Allocate memory for making the atomic copy of pagedir1 in the |
7764 | + * case where it is bigger than pagedir2. |
7765 | + * Arguments: int num_to_alloc: Number of extra pages needed. |
7766 | + * Result: int. Number of extra pages we now have allocated. |
7767 | + */ |
7768 | +static int suspend_allocate_extra_pagedir_memory(int extra_pages_needed) |
7769 | +{ |
7770 | + int j, order, num_to_alloc = extra_pages_needed - extra_pages_allocated; |
7771 | + unsigned long flags = GFP_ATOMIC | __GFP_NOWARN; |
7772 | + |
7773 | + if (num_to_alloc < 1) |
7774 | + return 0; |
7775 | + |
7776 | + order = fls(num_to_alloc); |
7777 | + if (order >= MAX_ORDER) |
7778 | + order = MAX_ORDER - 1; |
7779 | + |
7780 | + while (num_to_alloc) { |
7781 | + struct page *newpage; |
7782 | + unsigned long virt; |
7783 | + struct extras *extras_entry; |
7784 | + |
7785 | + while ((1 << order) > num_to_alloc) |
7786 | + order--; |
7787 | + |
7788 | + extras_entry = (struct extras *) kmalloc(sizeof(struct extras), |
7789 | + GFP_ATOMIC); |
7790 | + |
7791 | + if (!extras_entry) |
7792 | + return extra_pages_allocated; |
7793 | + |
7794 | + virt = __get_free_pages(flags, order); |
7795 | + while (!virt && order) { |
7796 | + order--; |
7797 | + virt = __get_free_pages(flags, order); |
7798 | + } |
7799 | + |
7800 | + if (!virt) { |
7801 | + kfree(extras_entry); |
7802 | + return extra_pages_allocated; |
7803 | + } |
7804 | + |
7805 | + newpage = virt_to_page(virt); |
7806 | + |
7807 | + extras_entry->page = newpage; |
7808 | + extras_entry->order = order; |
7809 | + extras_entry->next = NULL; |
7810 | + |
7811 | + if (extras_list) |
7812 | + extras_entry->next = extras_list; |
7813 | + |
7814 | + extras_list = extras_entry; |
7815 | + |
7816 | + for (j = 0; j < (1 << order); j++) { |
7817 | + SetPageNosave(newpage + j); |
7818 | + SetPagePageset1Copy(newpage + j); |
7819 | + } |
7820 | + |
7821 | + extra_pages_allocated += (1 << order); |
7822 | + num_to_alloc -= (1 << order); |
7823 | + } |
7824 | + |
7825 | + return extra_pages_allocated; |
7826 | +} |
7827 | + |
7828 | +/* |
7829 | + * real_nr_free_pages: Count pcp pages for a zone type or all zones |
7830 | + * (-1 for all, otherwise zone_idx() result desired). |
7831 | + */ |
7832 | +int real_nr_free_pages(unsigned long zone_idx_mask) |
7833 | +{ |
7834 | + struct zone *zone; |
7835 | + int result = 0, i = 0, cpu; |
7836 | + |
7837 | + /* PCP lists */ |
7838 | + for_each_zone(zone) { |
7839 | + if (!populated_zone(zone)) |
7840 | + continue; |
7841 | + |
7842 | + if (!(zone_idx_mask & (1 << zone_idx(zone)))) |
7843 | + continue; |
7844 | + |
7845 | + for_each_online_cpu(cpu) { |
7846 | + struct per_cpu_pageset *pset = zone_pcp(zone, cpu); |
7847 | + |
7848 | + for (i = 0; i < ARRAY_SIZE(pset->pcp); i++) { |
7849 | + struct per_cpu_pages *pcp; |
7850 | + |
7851 | + pcp = &pset->pcp[i]; |
7852 | + result += pcp->count; |
7853 | + } |
7854 | + } |
7855 | + |
7856 | + result += zone_page_state(zone, NR_FREE_PAGES); |
7857 | + } |
7858 | + return result; |
7859 | +} |
7860 | + |
7861 | +/* |
7862 | + * Discover how much extra memory will be required by the drivers |
7863 | + * when they're asked to suspend. We can then ensure that amount |
7864 | + * of memory is available when we really want it. |
7865 | + */ |
7866 | +static void get_extra_pd1_allowance(void) |
7867 | +{ |
7868 | + int orig_num_free = real_nr_free_pages(all_zones_mask), final; |
7869 | + |
7870 | + suspend_prepare_status(CLEAR_BAR, "Finding allowance for drivers."); |
7871 | + |
7872 | + suspend_console(); |
7873 | + device_suspend(PMSG_FREEZE); |
7874 | + local_irq_disable(); /* irqs might have been re-enabled on us */ |
7875 | + device_power_down(PMSG_FREEZE); |
7876 | + |
7877 | + final = real_nr_free_pages(all_zones_mask); |
7878 | + |
7879 | + device_power_up(); |
7880 | + local_irq_enable(); |
7881 | + device_resume(); |
7882 | + resume_console(); |
7883 | + |
7884 | + extra_pd1_pages_allowance = max( |
7885 | + orig_num_free - final + MIN_EXTRA_PAGES_ALLOWANCE, |
7886 | + MIN_EXTRA_PAGES_ALLOWANCE); |
7887 | +} |
7888 | + |
7889 | +/* |
7890 | + * Amount of storage needed, possibly taking into account the |
7891 | + * expected compression ratio and possibly also ignoring our |
7892 | + * allowance for extra pages. |
7893 | + */ |
7894 | +static int main_storage_needed(int use_ecr, |
7895 | + int ignore_extra_pd1_allow) |
7896 | +{ |
7897 | + return ((pagedir1.size + pagedir2.size + |
7898 | + (ignore_extra_pd1_allow ? 0 : extra_pd1_pages_allowance)) * |
7899 | + (use_ecr ? suspend_expected_compression_ratio() : 100) / 100); |
7900 | +} |
7901 | + |
7902 | +/* |
7903 | + * Storage needed for the image header, in bytes until the return. |
7904 | + */ |
7905 | +static int header_storage_needed(void) |
7906 | +{ |
7907 | + int bytes = (int) sizeof(struct suspend_header) + |
7908 | + suspend_header_storage_for_modules() + |
7909 | + suspend_pageflags_space_needed(); |
7910 | + |
7911 | + return DIV_ROUND_UP(bytes, PAGE_SIZE); |
7912 | +} |
7913 | + |
7914 | +/* |
7915 | + * When freeing memory, pages from either pageset might be freed. |
7916 | + * |
7917 | + * When seeking to free memory to be able to suspend, for every ps1 page freed, |
7918 | + * we need 2 less pages for the atomic copy because there is one less page to |
7919 | + * copy and one more page into which data can be copied. |
7920 | + * |
7921 | + * Freeing ps2 pages saves us nothing directly. No more memory is available |
7922 | + * for the atomic copy. Indirectly, a ps1 page might be freed (slab?), but |
7923 | + * that's too much work to figure out. |
7924 | + * |
7925 | + * => ps1_to_free functions |
7926 | + * |
7927 | + * Of course if we just want to reduce the image size, because of storage |
7928 | + * limitations or an image size limit either ps will do. |
7929 | + * |
7930 | + * => any_to_free function |
7931 | + */ |
7932 | + |
7933 | +static int highpages_ps1_to_free(void) |
7934 | +{ |
7935 | + return max_t(int, 0, DIV_ROUND_UP(get_highmem_size(pagedir1) - |
7936 | + get_highmem_size(pagedir2), 2) - real_nr_free_high_pages()); |
7937 | +} |
7938 | + |
7939 | +static int lowpages_ps1_to_free(void) |
7940 | +{ |
7941 | + return max_t(int, 0, DIV_ROUND_UP(get_lowmem_size(pagedir1) + |
7942 | + extra_pd1_pages_allowance + MIN_FREE_RAM + |
7943 | + suspend_memory_for_modules() - get_lowmem_size(pagedir2) - |
7944 | + real_nr_free_low_pages() - extra_pages_allocated, 2)); |
7945 | +} |
7946 | + |
7947 | +static int current_image_size(void) |
7948 | +{ |
7949 | + return pagedir1.size + pagedir2.size + header_space_allocated; |
7950 | +} |
7951 | + |
7952 | +static int any_to_free(int use_image_size_limit) |
7953 | +{ |
7954 | + int user_limit = (use_image_size_limit && image_size_limit > 0) ? |
7955 | + max_t(int, 0, current_image_size() - (image_size_limit << 8)) |
7956 | + : 0; |
7957 | + |
7958 | + int storage_limit = max_t(int, 0, |
7959 | + main_storage_needed(1, 1) - storage_available); |
7960 | + |
7961 | + return max(user_limit, storage_limit); |
7962 | +} |
7963 | + |
7964 | +/* amount_needed |
7965 | + * |
7966 | + * Calculates the amount by which the image size needs to be reduced to meet |
7967 | + * our constraints. |
7968 | + */ |
7969 | +static int amount_needed(int use_image_size_limit) |
7970 | +{ |
7971 | + return max(highpages_ps1_to_free() + lowpages_ps1_to_free(), |
7972 | + any_to_free(use_image_size_limit)); |
7973 | +} |
7974 | + |
7975 | +static int image_not_ready(int use_image_size_limit) |
7976 | +{ |
7977 | + suspend_message(SUSPEND_EAT_MEMORY, SUSPEND_LOW, 1, |
7978 | + "Amount still needed (%d) > 0:%d. Header: %d < %d: %d," |
7979 | + " Storage allocd: %d < %d: %d.\n", |
7980 | + amount_needed(use_image_size_limit), |
7981 | + (amount_needed(use_image_size_limit) > 0), |
7982 | + header_space_allocated, header_storage_needed(), |
7983 | + header_space_allocated < header_storage_needed(), |
7984 | + main_storage_allocated, |
7985 | + main_storage_needed(1, 1), |
7986 | + main_storage_allocated < main_storage_needed(1, 1)); |
7987 | + |
7988 | + suspend_cond_pause(0, NULL); |
7989 | + |
7990 | + return ((amount_needed(use_image_size_limit) > 0) || |
7991 | + header_space_allocated < header_storage_needed() || |
7992 | + main_storage_allocated < main_storage_needed(1, 1)); |
7993 | +} |
7994 | + |
7995 | +static void display_stats(int always, int sub_extra_pd1_allow) |
7996 | +{ |
7997 | + char buffer[255]; |
7998 | + snprintf(buffer, 254, |
7999 | + "Free:%d(%d). Sets:%d(%d),%d(%d). Header:%d/%d. Nosave:%d-%d" |
8000 | + "=%d. Storage:%u/%u(%u=>%u). Needed:%d,%d,%d(%d,%d,%d,%d)\n", |
8001 | + |
8002 | + /* Free */ |
8003 | + real_nr_free_pages(all_zones_mask), |
8004 | + real_nr_free_low_pages(), |
8005 | + |
8006 | + /* Sets */ |
8007 | + pagedir1.size, pagedir1.size - get_highmem_size(pagedir1), |
8008 | + pagedir2.size, pagedir2.size - get_highmem_size(pagedir2), |
8009 | + |
8010 | + /* Header */ |
8011 | + header_space_allocated, header_storage_needed(), |
8012 | + |
8013 | + /* Nosave */ |
8014 | + num_nosave, extra_pages_allocated, |
8015 | + num_nosave - extra_pages_allocated, |
8016 | + |
8017 | + /* Storage */ |
8018 | + main_storage_allocated, |
8019 | + storage_available, |
8020 | + main_storage_needed(1, sub_extra_pd1_allow), |
8021 | + main_storage_needed(1, 1), |
8022 | + |
8023 | + /* Needed */ |
8024 | + lowpages_ps1_to_free(), highpages_ps1_to_free(), |
8025 | + any_to_free(1), |
8026 | + MIN_FREE_RAM, suspend_memory_for_modules(), |
8027 | + extra_pd1_pages_allowance, image_size_limit << 8); |
8028 | + |
8029 | + if (always) |
8030 | + printk(buffer); |
8031 | + else |
8032 | + suspend_message(SUSPEND_EAT_MEMORY, SUSPEND_MEDIUM, 1, buffer); |
8033 | +} |
8034 | + |
8035 | +/* generate_free_page_map |
8036 | + * |
8037 | + * Description: This routine generates a bitmap of free pages from the |
8038 | + * lists used by the memory manager. We then use the bitmap |
8039 | + * to quickly calculate which pages to save and in which |
8040 | + * pagesets. |
8041 | + */ |
8042 | +static void generate_free_page_map(void) |
8043 | +{ |
8044 | + int order, loop, cpu; |
8045 | + struct page *page; |
8046 | + unsigned long flags, i; |
8047 | + struct zone *zone; |
8048 | + |
8049 | + for_each_zone(zone) { |
8050 | + if (!populated_zone(zone)) |
8051 | + continue; |
8052 | + |
8053 | + spin_lock_irqsave(&zone->lock, flags); |
8054 | + |
8055 | + for(i=0; i < zone->spanned_pages; i++) |
8056 | + ClearPageNosaveFree(pfn_to_page( |
8057 | + zone->zone_start_pfn + i)); |
8058 | + |
8059 | + for (order = MAX_ORDER - 1; order >= 0; --order) |
8060 | + list_for_each_entry(page, |
8061 | + &zone->free_area[order].free_list, lru) |
8062 | + for(loop=0; loop < (1 << order); loop++) |
8063 | + SetPageNosaveFree(page+loop); |
8064 | + |
8065 | + |
8066 | + for_each_online_cpu(cpu) { |
8067 | + struct per_cpu_pageset *pset = zone_pcp(zone, cpu); |
8068 | + |
8069 | + for (i = 0; i < ARRAY_SIZE(pset->pcp); i++) { |
8070 | + struct per_cpu_pages *pcp; |
8071 | + struct page *page; |
8072 | + |
8073 | + pcp = &pset->pcp[i]; |
8074 | + list_for_each_entry(page, &pcp->list, lru) |
8075 | + SetPageNosaveFree(page); |
8076 | + } |
8077 | + } |
8078 | + |
8079 | + spin_unlock_irqrestore(&zone->lock, flags); |
8080 | + } |
8081 | +} |
8082 | + |
8083 | +/* size_of_free_region |
8084 | + * |
8085 | + * Description: Return the number of pages that are free, beginning with and |
8086 | + * including this one. |
8087 | + */ |
8088 | +static int size_of_free_region(struct page *page) |
8089 | +{ |
8090 | + struct zone *zone = page_zone(page); |
8091 | + struct page *posn = page, *last_in_zone = |
8092 | + pfn_to_page(zone->zone_start_pfn) + zone->spanned_pages - 1; |
8093 | + |
8094 | + while (posn <= last_in_zone && PageNosaveFree(posn)) |
8095 | + posn++; |
8096 | + return (posn - page); |
8097 | +} |
8098 | + |
8099 | +/* flag_image_pages |
8100 | + * |
8101 | + * This routine generates our lists of pages to be stored in each |
8102 | + * pageset. Since we store the data using extents, and adding new |
8103 | + * extents might allocate a new extent page, this routine may well |
8104 | + * be called more than once. |
8105 | + */ |
8106 | +static void flag_image_pages(int atomic_copy) |
8107 | +{ |
8108 | + int num_free = 0; |
8109 | + unsigned long loop; |
8110 | + struct zone *zone; |
8111 | + |
8112 | + pagedir1.size = 0; |
8113 | + pagedir2.size = 0; |
8114 | + |
8115 | + set_highmem_size(pagedir1, 0); |
8116 | + set_highmem_size(pagedir2, 0); |
8117 | + |
8118 | + num_nosave = 0; |
8119 | + |
8120 | + clear_dyn_pageflags(pageset1_map); |
8121 | + |
8122 | + generate_free_page_map(); |
8123 | + |
8124 | + /* |
8125 | + * Pages not to be saved are marked Nosave irrespective of being reserved |
8126 | + */ |
8127 | + for_each_zone(zone) { |
8128 | + int highmem = is_highmem(zone); |
8129 | + |
8130 | + if (!populated_zone(zone)) |
8131 | + continue; |
8132 | + |
8133 | + for (loop = 0; loop < zone->spanned_pages; loop++) { |
8134 | + unsigned long pfn = zone->zone_start_pfn + loop; |
8135 | + struct page *page; |
8136 | + int chunk_size; |
8137 | + |
8138 | + if (!pfn_valid(pfn)) |
8139 | + continue; |
8140 | + |
8141 | + page = pfn_to_page(pfn); |
8142 | + |
8143 | + chunk_size = size_of_free_region(page); |
8144 | + if (chunk_size) { |
8145 | + num_free += chunk_size; |
8146 | + loop += chunk_size - 1; |
8147 | + continue; |
8148 | + } |
8149 | + |
8150 | + if (highmem) |
8151 | + page = saveable_highmem_page(pfn); |
8152 | + else |
8153 | + page = saveable_page(pfn); |
8154 | + |
8155 | + if (!page) { |
8156 | + num_nosave++; |
8157 | + continue; |
8158 | + } |
8159 | + |
8160 | + if (PagePageset2(page)) { |
8161 | + pagedir2.size++; |
8162 | + if (PageHighMem(page)) |
8163 | + inc_highmem_size(pagedir2); |
8164 | + else |
8165 | + SetPagePageset1Copy(page); |
8166 | + if (PageResave(page)) { |
8167 | + SetPagePageset1(page); |
8168 | + ClearPagePageset1Copy(page); |
8169 | + pagedir1.size++; |
8170 | + if (PageHighMem(page)) |
8171 | + inc_highmem_size(pagedir1); |
8172 | + } |
8173 | + } else { |
8174 | + pagedir1.size++; |
8175 | + SetPagePageset1(page); |
8176 | + if (PageHighMem(page)) |
8177 | + inc_highmem_size(pagedir1); |
8178 | + } |
8179 | + } |
8180 | + } |
8181 | + |
8182 | + if (atomic_copy) |
8183 | + return; |
8184 | + |
8185 | + suspend_message(SUSPEND_EAT_MEMORY, SUSPEND_MEDIUM, 0, |
8186 | + "Count data pages: Set1 (%d) + Set2 (%d) + Nosave (%d) + " |
8187 | + "NumFree (%d) = %d.\n", |
8188 | + pagedir1.size, pagedir2.size, num_nosave, num_free, |
8189 | + pagedir1.size + pagedir2.size + num_nosave + num_free); |
8190 | +} |
8191 | + |
8192 | +void suspend_recalculate_image_contents(int atomic_copy) |
8193 | +{ |
8194 | + clear_dyn_pageflags(pageset1_map); |
8195 | + if (!atomic_copy) { |
8196 | + int pfn; |
8197 | + BITMAP_FOR_EACH_SET(pageset2_map, pfn) |
8198 | + ClearPagePageset1Copy(pfn_to_page(pfn)); |
8199 | + /* Need to call this before getting pageset1_size! */ |
8200 | + suspend_mark_pages_for_pageset2(); |
8201 | + } |
8202 | + flag_image_pages(atomic_copy); |
8203 | + |
8204 | + if (!atomic_copy) { |
8205 | + storage_available = suspendActiveAllocator->storage_available(); |
8206 | + display_stats(0, 0); |
8207 | + } |
8208 | +} |
8209 | + |
8210 | +/* update_image |
8211 | + * |
8212 | + * Allocate [more] memory and storage for the image. |
8213 | + */ |
8214 | +static void update_image(void) |
8215 | +{ |
8216 | + int result, param_used, wanted, got; |
8217 | + |
8218 | + suspend_recalculate_image_contents(0); |
8219 | + |
8220 | + /* Include allowance for growth in pagedir1 while writing pagedir 2 */ |
8221 | + wanted = pagedir1.size + extra_pd1_pages_allowance - |
8222 | + get_lowmem_size(pagedir2); |
8223 | + if (wanted > extra_pages_allocated) { |
8224 | + got = suspend_allocate_extra_pagedir_memory(wanted); |
8225 | + if (wanted < got) { |
8226 | + suspend_message(SUSPEND_EAT_MEMORY, SUSPEND_LOW, 1, |
8227 | + "Want %d extra pages for pageset1, got %d.\n", |
8228 | + wanted, got); |
8229 | + return; |
8230 | + } |
8231 | + } |
8232 | + |
8233 | + thaw_kernel_threads(); |
8234 | + |
8235 | + /* |
8236 | + * Allocate remaining storage space, if possible, up to the |
8237 | + * maximum we know we'll need. It's okay to allocate the |
8238 | + * maximum if the writer is the swapwriter, but |
8239 | + * we don't want to grab all available space on an NFS share. |
8240 | + * We therefore ignore the expected compression ratio here, |
8241 | + * thereby trying to allocate the maximum image size we could |
8242 | + * need (assuming compression doesn't expand the image), but |
8243 | + * don't complain if we can't get the full amount we're after. |
8244 | + */ |
8245 | + |
8246 | + suspendActiveAllocator->allocate_storage( |
8247 | + min(storage_available, main_storage_needed(0, 0))); |
8248 | + |
8249 | + main_storage_allocated = suspendActiveAllocator->storage_allocated(); |
8250 | + |
8251 | + param_used = header_storage_needed(); |
8252 | + |
8253 | + result = suspendActiveAllocator->allocate_header_space(param_used); |
8254 | + |
8255 | + if (result) |
8256 | + suspend_message(SUSPEND_EAT_MEMORY, SUSPEND_LOW, 1, |
8257 | + "Still need to get more storage space for header.\n"); |
8258 | + else |
8259 | + header_space_allocated = param_used; |
8260 | + |
8261 | + if (freeze_processes()) { |
8262 | + set_result_state(SUSPEND_FREEZING_FAILED); |
8263 | + set_result_state(SUSPEND_ABORTED); |
8264 | + } |
8265 | + |
8266 | + allocate_checksum_pages(); |
8267 | + |
8268 | + suspend_recalculate_image_contents(0); |
8269 | +} |
8270 | + |
8271 | +/* attempt_to_freeze |
8272 | + * |
8273 | + * Try to freeze processes. |
8274 | + */ |
8275 | + |
8276 | +static int attempt_to_freeze(void) |
8277 | +{ |
8278 | + int result; |
8279 | + |
8280 | + /* Stop processes before checking again */ |
8281 | + thaw_processes(); |
8282 | + suspend_prepare_status(CLEAR_BAR, "Freezing processes & syncing filesystems."); |
8283 | + result = freeze_processes(); |
8284 | + |
8285 | + if (result) { |
8286 | + set_result_state(SUSPEND_ABORTED); |
8287 | + set_result_state(SUSPEND_FREEZING_FAILED); |
8288 | + } |
8289 | + |
8290 | + return result; |
8291 | +} |
8292 | + |
8293 | +/* eat_memory |
8294 | + * |
8295 | + * Try to free some memory, either to meet hard or soft constraints on the image |
8296 | + * characteristics. |
8297 | + * |
8298 | + * Hard constraints: |
8299 | + * - Pageset1 must be < half of memory; |
8300 | + * - We must have enough memory free at resume time to have pageset1 |
8301 | + * be able to be loaded in pages that don't conflict with where it has to |
8302 | + * be restored. |
8303 | + * Soft constraints |
8304 | + * - User specificied image size limit. |
8305 | + */ |
8306 | +static void eat_memory(void) |
8307 | +{ |
8308 | + int amount_wanted = 0; |
8309 | + int free_flags = 0, did_eat_memory = 0; |
8310 | + |
8311 | + /* |
8312 | + * Note that if we have enough storage space and enough free memory, we |
8313 | + * may exit without eating anything. We give up when the last 10 |
8314 | + * iterations ate no extra pages because we're not going to get much |
8315 | + * more anyway, but the few pages we get will take a lot of time. |
8316 | + * |
8317 | + * We freeze processes before beginning, and then unfreeze them if we |
8318 | + * need to eat memory until we think we have enough. If our attempts |
8319 | + * to freeze fail, we give up and abort. |
8320 | + */ |
8321 | + |
8322 | + suspend_recalculate_image_contents(0); |
8323 | + amount_wanted = amount_needed(1); |
8324 | + |
8325 | + switch (image_size_limit) { |
8326 | + case -1: /* Don't eat any memory */ |
8327 | + if (amount_wanted > 0) { |
8328 | + set_result_state(SUSPEND_ABORTED); |
8329 | + set_result_state(SUSPEND_WOULD_EAT_MEMORY); |
8330 | + return; |
8331 | + } |
8332 | + break; |
8333 | + case -2: /* Free caches only */ |
8334 | + drop_pagecache(); |
8335 | + suspend_recalculate_image_contents(0); |
8336 | + amount_wanted = amount_needed(1); |
8337 | + did_eat_memory = 1; |
8338 | + break; |
8339 | + default: |
8340 | + free_flags = GFP_ATOMIC | __GFP_HIGHMEM; |
8341 | + } |
8342 | + |
8343 | + if (amount_wanted > 0 && !test_result_state(SUSPEND_ABORTED) && |
8344 | + image_size_limit != -1) { |
8345 | + struct zone *zone; |
8346 | + int zone_idx; |
8347 | + |
8348 | + suspend_prepare_status(CLEAR_BAR, "Seeking to free %dMB of memory.", MB(amount_wanted)); |
8349 | + |
8350 | + thaw_kernel_threads(); |
8351 | + |
8352 | + for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) { |
8353 | + int zone_type_free = max_t(int, (zone_idx == ZONE_HIGHMEM) ? |
8354 | + highpages_ps1_to_free() : |
8355 | + lowpages_ps1_to_free(), amount_wanted); |
8356 | + |
8357 | + if (zone_type_free < 0) |
8358 | + break; |
8359 | + |
8360 | + for_each_zone(zone) { |
8361 | + if (zone_idx(zone) != zone_idx) |
8362 | + continue; |
8363 | + |
8364 | + shrink_one_zone(zone, zone_type_free); |
8365 | + |
8366 | + did_eat_memory = 1; |
8367 | + |
8368 | + suspend_recalculate_image_contents(0); |
8369 | + |
8370 | + amount_wanted = amount_needed(1); |
8371 | + zone_type_free = max_t(int, (zone_idx == ZONE_HIGHMEM) ? |
8372 | + highpages_ps1_to_free() : |
8373 | + lowpages_ps1_to_free(), amount_wanted); |
8374 | + |
8375 | + if (zone_type_free < 0) |
8376 | + break; |
8377 | + } |
8378 | + } |
8379 | + |
8380 | + suspend_cond_pause(0, NULL); |
8381 | + |
8382 | + if (freeze_processes()) { |
8383 | + set_result_state(SUSPEND_FREEZING_FAILED); |
8384 | + set_result_state(SUSPEND_ABORTED); |
8385 | + } |
8386 | + } |
8387 | + |
8388 | + if (did_eat_memory) { |
8389 | + unsigned long orig_state = get_suspend_state(); |
8390 | + /* Freeze_processes will call sys_sync too */ |
8391 | + restore_suspend_state(orig_state); |
8392 | + suspend_recalculate_image_contents(0); |
8393 | + } |
8394 | + |
8395 | + /* Blank out image size display */ |
8396 | + suspend_update_status(100, 100, NULL); |
8397 | +} |
8398 | + |
8399 | +/* suspend_prepare_image |
8400 | + * |
8401 | + * Entry point to the whole image preparation section. |
8402 | + * |
8403 | + * We do four things: |
8404 | + * - Freeze processes; |
8405 | + * - Ensure image size constraints are met; |
8406 | + * - Complete all the preparation for saving the image, |
8407 | + * including allocation of storage. The only memory |
8408 | + * that should be needed when we're finished is that |
8409 | + * for actually storing the image (and we know how |
8410 | + * much is needed for that because the modules tell |
8411 | + * us). |
8412 | + * - Make sure that all dirty buffers are written out. |
8413 | + */ |
8414 | +#define MAX_TRIES 2 |
8415 | +int suspend_prepare_image(void) |
8416 | +{ |
8417 | + int result = 1, tries = 1; |
8418 | + |
8419 | + header_space_allocated = 0; |
8420 | + main_storage_allocated = 0; |
8421 | + |
8422 | + if (attempt_to_freeze()) |
8423 | + return 1; |
8424 | + |
8425 | + if (!extra_pd1_pages_allowance) |
8426 | + get_extra_pd1_allowance(); |
8427 | + |
8428 | + storage_available = suspendActiveAllocator->storage_available(); |
8429 | + |
8430 | + if (!storage_available) { |
8431 | + printk(KERN_ERR "You need some storage available to be able to suspend.\n"); |
8432 | + set_result_state(SUSPEND_ABORTED); |
8433 | + set_result_state(SUSPEND_NOSTORAGE_AVAILABLE); |
8434 | + return 1; |
8435 | + } |
8436 | + |
8437 | + do { |
8438 | + suspend_prepare_status(CLEAR_BAR, "Preparing Image. Try %d.", tries); |
8439 | + |
8440 | + eat_memory(); |
8441 | + |
8442 | + if (test_result_state(SUSPEND_ABORTED)) |
8443 | + break; |
8444 | + |
8445 | + update_image(); |
8446 | + |
8447 | + tries++; |
8448 | + |
8449 | + } while (image_not_ready(1) && tries <= MAX_TRIES && |
8450 | + !test_result_state(SUSPEND_ABORTED)); |
8451 | + |
8452 | + result = image_not_ready(0); |
8453 | + |
8454 | + if (!test_result_state(SUSPEND_ABORTED)) { |
8455 | + if (result) { |
8456 | + display_stats(1, 0); |
8457 | + abort_suspend(SUSPEND_UNABLE_TO_PREPARE_IMAGE, |
8458 | + "Unable to successfully prepare the image.\n"); |
8459 | + } else { |
8460 | + unlink_lru_lists(); |
8461 | + suspend_cond_pause(1, "Image preparation complete."); |
8462 | + } |
8463 | + } |
8464 | + |
8465 | + return result; |
8466 | +} |
8467 | + |
8468 | +#ifdef CONFIG_SUSPEND2_EXPORTS |
8469 | +EXPORT_SYMBOL_GPL(real_nr_free_pages); |
8470 | +#endif |
8471 | diff --git a/kernel/power/prepare_image.h b/kernel/power/prepare_image.h |
8472 | new file mode 100644 |
8473 | index 0000000..8c2e426 |
8474 | --- /dev/null |
8475 | +++ b/kernel/power/prepare_image.h |
8476 | @@ -0,0 +1,34 @@ |
8477 | +/* |
8478 | + * kernel/power/prepare_image.h |
8479 | + * |
8480 | + * Copyright (C) 2003-2007 Nigel Cunningham (nigel at suspend2 net) |
8481 | + * |
8482 | + * This file is released under the GPLv2. |
8483 | + * |
8484 | + */ |
8485 | + |
8486 | +#include <asm/sections.h> |
8487 | + |
8488 | +extern int suspend_prepare_image(void); |
8489 | +extern void suspend_recalculate_image_contents(int storage_available); |
8490 | +extern int real_nr_free_pages(unsigned long zone_idx_mask); |
8491 | +extern int image_size_limit; |
8492 | +extern void suspend_free_extra_pagedir_memory(void); |
8493 | +extern int extra_pd1_pages_allowance; |
8494 | + |
8495 | +#define MIN_FREE_RAM 100 |
8496 | +#define MIN_EXTRA_PAGES_ALLOWANCE 500 |
8497 | + |
8498 | +#define all_zones_mask ((unsigned long) ((1 << MAX_NR_ZONES) - 1)) |
8499 | +#ifdef CONFIG_HIGHMEM |
8500 | +#define real_nr_free_high_pages() (real_nr_free_pages(1 << ZONE_HIGHMEM)) |
8501 | +#define real_nr_free_low_pages() (real_nr_free_pages(all_zones_mask - \ |
8502 | + (1 << ZONE_HIGHMEM))) |
8503 | +#else |
8504 | +#define real_nr_free_high_pages() (0) |
8505 | +#define real_nr_free_low_pages() (real_nr_free_pages(all_zones_mask)) |
8506 | + |
8507 | +/* For eat_memory function */ |
8508 | +#define ZONE_HIGHMEM (MAX_NR_ZONES + 1) |
8509 | +#endif |
8510 | + |
8511 | diff --git a/kernel/power/process.c b/kernel/power/process.c |
8512 | index 6d566bf..90a4cc5 100644 |
8513 | --- a/kernel/power/process.c |
8514 | +++ b/kernel/power/process.c |
8515 | @@ -15,6 +15,8 @@ |
8516 | #include <linux/syscalls.h> |
8517 | #include <linux/freezer.h> |
8518 | |
8519 | +int freezer_state = 0; |
8520 | + |
8521 | /* |
8522 | * Timeout for stopping processes |
8523 | */ |
8524 | @@ -179,10 +181,11 @@ int freeze_processes(void) |
8525 | return nr_unfrozen; |
8526 | |
8527 | sys_sync(); |
8528 | + freezer_state = FREEZER_USERSPACE_FROZEN; |
8529 | nr_unfrozen = try_to_freeze_tasks(FREEZER_KERNEL_THREADS); |
8530 | if (nr_unfrozen) |
8531 | return nr_unfrozen; |
8532 | - |
8533 | + freezer_state = FREEZER_FULLY_ON; |
8534 | printk("done.\n"); |
8535 | BUG_ON(in_atomic()); |
8536 | return 0; |
8537 | @@ -200,7 +203,7 @@ static void thaw_tasks(int thaw_user_space) |
8538 | if (is_user_space(p) == !thaw_user_space) |
8539 | continue; |
8540 | |
8541 | - if (!thaw_process(p)) |
8542 | + if (!thaw_process(p) && p->state != TASK_TRACED) |
8543 | printk(KERN_WARNING " Strange, %s not stopped\n", |
8544 | p->comm ); |
8545 | } while_each_thread(g, p); |
8546 | @@ -209,11 +212,31 @@ static void thaw_tasks(int thaw_user_space) |
8547 | |
8548 | void thaw_processes(void) |
8549 | { |
8550 | + int old_state = freezer_state; |
8551 | + |
8552 | + if (old_state == FREEZER_OFF) |
8553 | + return; |
8554 | + |
8555 | + /* |
8556 | + * Change state beforehand because thawed tasks might submit I/O |
8557 | + * immediately. |
8558 | + */ |
8559 | + freezer_state = FREEZER_OFF; |
8560 | + |
8561 | printk("Restarting tasks ... "); |
8562 | - thaw_tasks(FREEZER_KERNEL_THREADS); |
8563 | + |
8564 | + if (old_state == FREEZER_FULLY_ON) |
8565 | + thaw_tasks(FREEZER_KERNEL_THREADS); |
8566 | thaw_tasks(FREEZER_USER_SPACE); |
8567 | schedule(); |
8568 | printk("done.\n"); |
8569 | } |
8570 | |
8571 | +void thaw_kernel_threads(void) |
8572 | +{ |
8573 | + freezer_state = FREEZER_USERSPACE_FROZEN; |
8574 | + thaw_tasks(FREEZER_KERNEL_THREADS); |
8575 | +} |
8576 | + |
8577 | EXPORT_SYMBOL(refrigerator); |
8578 | +EXPORT_SYMBOL(freezer_state); |
8579 | diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c |
8580 | index fc53ad0..319c96a 100644 |
8581 | --- a/kernel/power/snapshot.c |
8582 | +++ b/kernel/power/snapshot.c |
8583 | @@ -33,6 +33,7 @@ |
8584 | #include <asm/io.h> |
8585 | |
8586 | #include "power.h" |
8587 | +#include "suspend2_builtin.h" |
8588 | |
8589 | /* List of PBEs needed for restoring the pages that were allocated before |
8590 | * the suspend and included in the suspend image, but have also been |
8591 | @@ -40,6 +41,13 @@ |
8592 | * directly to their "original" page frames. |
8593 | */ |
8594 | struct pbe *restore_pblist; |
8595 | +int resume_attempted; |
8596 | +EXPORT_SYMBOL_GPL(resume_attempted); |
8597 | + |
8598 | +#ifdef CONFIG_SUSPEND2 |
8599 | +#include "pagedir.h" |
8600 | +int suspend_post_context_save(void); |
8601 | +#endif |
8602 | |
8603 | /* Pointer to an auxiliary buffer (1 page) */ |
8604 | static void *buffer; |
8605 | @@ -82,6 +90,11 @@ static void *get_image_page(gfp_t gfp_mask, int safe_needed) |
8606 | |
8607 | unsigned long get_safe_page(gfp_t gfp_mask) |
8608 | { |
8609 | +#ifdef CONFIG_SUSPEND2 |
8610 | + if (suspend2_running) |
8611 | + return suspend_get_nonconflicting_page(); |
8612 | +#endif |
8613 | + |
8614 | return (unsigned long)get_image_page(gfp_mask, PG_SAFE); |
8615 | } |
8616 | |
8617 | @@ -604,7 +617,7 @@ static unsigned int count_free_highmem_pages(void) |
8618 | * and it isn't a part of a free chunk of pages. |
8619 | */ |
8620 | |
8621 | -static struct page *saveable_highmem_page(unsigned long pfn) |
8622 | +struct page *saveable_highmem_page(unsigned long pfn) |
8623 | { |
8624 | struct page *page; |
8625 | |
8626 | @@ -646,7 +659,6 @@ unsigned int count_highmem_pages(void) |
8627 | return n; |
8628 | } |
8629 | #else |
8630 | -static inline void *saveable_highmem_page(unsigned long pfn) { return NULL; } |
8631 | static inline unsigned int count_highmem_pages(void) { return 0; } |
8632 | #endif /* CONFIG_HIGHMEM */ |
8633 | |
8634 | @@ -670,7 +682,7 @@ static inline int pfn_is_nosave(unsigned long pfn) |
8635 | * a free chunk of pages. |
8636 | */ |
8637 | |
8638 | -static struct page *saveable_page(unsigned long pfn) |
8639 | +struct page *saveable_page(unsigned long pfn) |
8640 | { |
8641 | struct page *page; |
8642 | |
8643 | @@ -986,6 +998,11 @@ asmlinkage int swsusp_save(void) |
8644 | { |
8645 | unsigned int nr_pages, nr_highmem; |
8646 | |
8647 | +#ifdef CONFIG_SUSPEND2 |
8648 | + if (suspend2_running) |
8649 | + return suspend_post_context_save(); |
8650 | +#endif |
8651 | + |
8652 | printk("swsusp: critical section: \n"); |
8653 | |
8654 | drain_local_pages(); |
8655 | diff --git a/kernel/power/storage.c b/kernel/power/storage.c |
8656 | new file mode 100644 |
8657 | index 0000000..702c1d4 |
8658 | --- /dev/null |
8659 | +++ b/kernel/power/storage.c |
8660 | @@ -0,0 +1,288 @@ |
8661 | +/* |
8662 | + * kernel/power/storage.c |
8663 | + * |
8664 | + * Copyright (C) 2005-2007 Nigel Cunningham (nigel at suspend2 net) |
8665 | + * |
8666 | + * This file is released under the GPLv2. |
8667 | + * |
8668 | + * Routines for talking to a userspace program that manages storage. |
8669 | + * |
8670 | + * The kernel side: |
8671 | + * - starts the userspace program; |
8672 | + * - sends messages telling it when to open and close the connection; |
8673 | + * - tells it when to quit; |
8674 | + * |
8675 | + * The user space side: |
8676 | + * - passes messages regarding status; |
8677 | + * |
8678 | + */ |
8679 | + |
8680 | +#include <linux/suspend.h> |
8681 | +#include <linux/freezer.h> |
8682 | + |
8683 | +#include "sysfs.h" |
8684 | +#include "modules.h" |
8685 | +#include "netlink.h" |
8686 | +#include "storage.h" |
8687 | +#include "ui.h" |
8688 | + |
8689 | +static struct user_helper_data usm_helper_data; |
8690 | +static struct suspend_module_ops usm_ops; |
8691 | +static int message_received = 0; |
8692 | +static int usm_prepare_count = 0; |
8693 | +static int storage_manager_last_action = 0; |
8694 | +static int storage_manager_action = 0; |
8695 | + |
8696 | +static int usm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
8697 | +{ |
8698 | + int type; |
8699 | + int *data; |
8700 | + |
8701 | + type = nlh->nlmsg_type; |
8702 | + |
8703 | + /* A control message: ignore them */ |
8704 | + if (type < NETLINK_MSG_BASE) |
8705 | + return 0; |
8706 | + |
8707 | + /* Unknown message: reply with EINVAL */ |
8708 | + if (type >= USM_MSG_MAX) |
8709 | + return -EINVAL; |
8710 | + |
8711 | + /* All operations require privileges, even GET */ |
8712 | + if (security_netlink_recv(skb, CAP_NET_ADMIN)) |
8713 | + return -EPERM; |
8714 | + |
8715 | + /* Only allow one task to receive NOFREEZE privileges */ |
8716 | + if (type == NETLINK_MSG_NOFREEZE_ME && usm_helper_data.pid != -1) |
8717 | + return -EBUSY; |
8718 | + |
8719 | + data = (int*)NLMSG_DATA(nlh); |
8720 | + |
8721 | + switch (type) { |
8722 | + case USM_MSG_SUCCESS: |
8723 | + case USM_MSG_FAILED: |
8724 | + message_received = type; |
8725 | + complete(&usm_helper_data.wait_for_process); |
8726 | + break; |
8727 | + default: |
8728 | + printk("Storage manager doesn't recognise message %d.\n", type); |
8729 | + } |
8730 | + |
8731 | + return 1; |
8732 | +} |
8733 | + |
8734 | +#ifdef CONFIG_NET |
8735 | +static int activations = 0; |
8736 | + |
8737 | +int suspend_activate_storage(int force) |
8738 | +{ |
8739 | + int tries = 1; |
8740 | + |
8741 | + if (usm_helper_data.pid == -1 || !usm_ops.enabled) |
8742 | + return 0; |
8743 | + |
8744 | + message_received = 0; |
8745 | + activations++; |
8746 | + |
8747 | + if (activations > 1 && !force) |
8748 | + return 0; |
8749 | + |
8750 | + while ((!message_received || message_received == USM_MSG_FAILED) && tries < 2) { |
8751 | + suspend_prepare_status(DONT_CLEAR_BAR, "Activate storage attempt %d.\n", tries); |
8752 | + |
8753 | + init_completion(&usm_helper_data.wait_for_process); |
8754 | + |
8755 | + suspend_send_netlink_message(&usm_helper_data, |
8756 | + USM_MSG_CONNECT, |
8757 | + NULL, 0); |
8758 | + |
8759 | + /* Wait 2 seconds for the userspace process to make contact */ |
8760 | + wait_for_completion_timeout(&usm_helper_data.wait_for_process, 2*HZ); |
8761 | + |
8762 | + tries++; |
8763 | + } |
8764 | + |
8765 | + return 0; |
8766 | +} |
8767 | + |
8768 | +int suspend_deactivate_storage(int force) |
8769 | +{ |
8770 | + if (usm_helper_data.pid == -1 || !usm_ops.enabled) |
8771 | + return 0; |
8772 | + |
8773 | + message_received = 0; |
8774 | + activations--; |
8775 | + |
8776 | + if (activations && !force) |
8777 | + return 0; |
8778 | + |
8779 | + init_completion(&usm_helper_data.wait_for_process); |
8780 | + |
8781 | + suspend_send_netlink_message(&usm_helper_data, |
8782 | + USM_MSG_DISCONNECT, |
8783 | + NULL, 0); |
8784 | + |
8785 | + wait_for_completion_timeout(&usm_helper_data.wait_for_process, 2*HZ); |
8786 | + |
8787 | + if (!message_received || message_received == USM_MSG_FAILED) { |
8788 | + printk("Returning failure disconnecting storage.\n"); |
8789 | + return 1; |
8790 | + } |
8791 | + |
8792 | + return 0; |
8793 | +} |
8794 | +#endif |
8795 | + |
8796 | +static void storage_manager_simulate(void) |
8797 | +{ |
8798 | + printk("--- Storage manager simulate ---\n"); |
8799 | + suspend_prepare_usm(); |
8800 | + schedule(); |
8801 | + printk("--- Activate storage 1 ---\n"); |
8802 | + suspend_activate_storage(1); |
8803 | + schedule(); |
8804 | + printk("--- Deactivate storage 1 ---\n"); |
8805 | + suspend_deactivate_storage(1); |
8806 | + schedule(); |
8807 | + printk("--- Cleanup usm ---\n"); |
8808 | + suspend_cleanup_usm(); |
8809 | + schedule(); |
8810 | + printk("--- Storage manager simulate ends ---\n"); |
8811 | +} |
8812 | + |
8813 | +static int usm_storage_needed(void) |
8814 | +{ |
8815 | + return strlen(usm_helper_data.program); |
8816 | +} |
8817 | + |
8818 | +static int usm_save_config_info(char *buf) |
8819 | +{ |
8820 | + int len = strlen(usm_helper_data.program); |
8821 | + memcpy(buf, usm_helper_data.program, len); |
8822 | + return len; |
8823 | +} |
8824 | + |
8825 | +static void usm_load_config_info(char *buf, int size) |
8826 | +{ |
8827 | + /* Don't load the saved path if one has already been set */ |
8828 | + if (usm_helper_data.program[0]) |
8829 | + return; |
8830 | + |
8831 | + memcpy(usm_helper_data.program, buf, size); |
8832 | +} |
8833 | + |
8834 | +static int usm_memory_needed(void) |
8835 | +{ |
8836 | + /* ball park figure of 32 pages */ |
8837 | + return (32 * PAGE_SIZE); |
8838 | +} |
8839 | + |
8840 | +/* suspend_prepare_usm |
8841 | + */ |
8842 | +int suspend_prepare_usm(void) |
8843 | +{ |
8844 | + usm_prepare_count++; |
8845 | + |
8846 | + if (usm_prepare_count > 1 || !usm_ops.enabled) |
8847 | + return 0; |
8848 | + |
8849 | + usm_helper_data.pid = -1; |
8850 | + |
8851 | + if (!*usm_helper_data.program) |
8852 | + return 0; |
8853 | + |
8854 | + suspend_netlink_setup(&usm_helper_data); |
8855 | + |
8856 | + if (usm_helper_data.pid == -1) |
8857 | + printk("Suspend2 Storage Manager wanted, but couldn't start it.\n"); |
8858 | + |
8859 | + suspend_activate_storage(0); |
8860 | + |
8861 | + return (usm_helper_data.pid != -1); |
8862 | +} |
8863 | + |
8864 | +void suspend_cleanup_usm(void) |
8865 | +{ |
8866 | + usm_prepare_count--; |
8867 | + |
8868 | + if (usm_helper_data.pid > -1 && !usm_prepare_count) { |
8869 | + suspend_deactivate_storage(0); |
8870 | + suspend_netlink_close(&usm_helper_data); |
8871 | + } |
8872 | +} |
8873 | + |
8874 | +static void storage_manager_activate(void) |
8875 | +{ |
8876 | + if (storage_manager_action == storage_manager_last_action) |
8877 | + return; |
8878 | + |
8879 | + if (storage_manager_action) |
8880 | + suspend_prepare_usm(); |
8881 | + else |
8882 | + suspend_cleanup_usm(); |
8883 | + |
8884 | + storage_manager_last_action = storage_manager_action; |
8885 | +} |
8886 | + |
8887 | +/* |
8888 | + * User interface specific /sys/power/suspend2 entries. |
8889 | + */ |
8890 | + |
8891 | +static struct suspend_sysfs_data sysfs_params[] = { |
8892 | + { SUSPEND2_ATTR("simulate_atomic_copy", SYSFS_RW), |
8893 | + .type = SUSPEND_SYSFS_DATA_NONE, |
8894 | + .write_side_effect = storage_manager_simulate, |
8895 | + }, |
8896 | + |
8897 | + { SUSPEND2_ATTR("enabled", SYSFS_RW), |
8898 | + SYSFS_INT(&usm_ops.enabled, 0, 1, 0) |
8899 | + }, |
8900 | + |
8901 | + { SUSPEND2_ATTR("program", SYSFS_RW), |
8902 | + SYSFS_STRING(usm_helper_data.program, 254, 0) |
8903 | + }, |
8904 | + |
8905 | + { SUSPEND2_ATTR("activate_storage", SYSFS_RW), |
8906 | + SYSFS_INT(&storage_manager_action, 0, 1, 0), |
8907 | + .write_side_effect = storage_manager_activate, |
8908 | + } |
8909 | +}; |
8910 | + |
8911 | +static struct suspend_module_ops usm_ops = { |
8912 | + .type = MISC_MODULE, |
8913 | + .name = "Userspace Storage Manager", |
8914 | + .directory = "storage_manager", |
8915 | + .module = THIS_MODULE, |
8916 | + .storage_needed = usm_storage_needed, |
8917 | + .save_config_info = usm_save_config_info, |
8918 | + .load_config_info = usm_load_config_info, |
8919 | + .memory_needed = usm_memory_needed, |
8920 | + |
8921 | + .sysfs_data = sysfs_params, |
8922 | + .num_sysfs_entries = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data), |
8923 | +}; |
8924 | + |
8925 | +/* suspend_usm_sysfs_init |
8926 | + * Description: Boot time initialisation for user interface. |
8927 | + */ |
8928 | +int s2_usm_init(void) |
8929 | +{ |
8930 | + usm_helper_data.nl = NULL; |
8931 | + usm_helper_data.program[0] = '\0'; |
8932 | + usm_helper_data.pid = -1; |
8933 | + usm_helper_data.skb_size = 0; |
8934 | + usm_helper_data.pool_limit = 6; |
8935 | + usm_helper_data.netlink_id = NETLINK_SUSPEND2_USM; |
8936 | + usm_helper_data.name = "userspace storage manager"; |
8937 | + usm_helper_data.rcv_msg = usm_user_rcv_msg; |
8938 | + usm_helper_data.interface_version = 1; |
8939 | + usm_helper_data.must_init = 0; |
8940 | + init_completion(&usm_helper_data.wait_for_process); |
8941 | + |
8942 | + return suspend_register_module(&usm_ops); |
8943 | +} |
8944 | + |
8945 | +void s2_usm_exit(void) |
8946 | +{ |
8947 | + suspend_unregister_module(&usm_ops); |
8948 | +} |
8949 | diff --git a/kernel/power/storage.h b/kernel/power/storage.h |
8950 | new file mode 100644 |
8951 | index 0000000..e05eeef |
8952 | --- /dev/null |
8953 | +++ b/kernel/power/storage.h |
8954 | @@ -0,0 +1,53 @@ |
8955 | +/* |
8956 | + * kernel/power/storage.h |
8957 | + * |
8958 | + * Copyright (C) 2005-2007 Nigel Cunningham (nigel at suspend2 net) |
8959 | + * |
8960 | + * This file is released under the GPLv2. |
8961 | + */ |
8962 | + |
8963 | +#ifdef CONFIG_NET |
8964 | +int suspend_prepare_usm(void); |
8965 | +void suspend_cleanup_usm(void); |
8966 | + |
8967 | +int suspend_activate_storage(int force); |
8968 | +int suspend_deactivate_storage(int force); |
8969 | +extern int s2_usm_init(void); |
8970 | +extern void s2_usm_exit(void); |
8971 | +#else |
8972 | +static inline int s2_usm_init(void) { return 0; } |
8973 | +static inline void s2_usm_exit(void) { } |
8974 | + |
8975 | +static inline int suspend_activate_storage(int force) |
8976 | +{ |
8977 | + return 0; |
8978 | +} |
8979 | + |
8980 | +static inline int suspend_deactivate_storage(int force) |
8981 | +{ |
8982 | + return 0; |
8983 | +} |
8984 | + |
8985 | +static inline int suspend_prepare_usm(void) { return 0; } |
8986 | +static inline void suspend_cleanup_usm(void) { } |
8987 | +#endif |
8988 | + |
8989 | +enum { |
8990 | + USM_MSG_BASE = 0x10, |
8991 | + |
8992 | + /* Kernel -> Userspace */ |
8993 | + USM_MSG_CONNECT = 0x30, |
8994 | + USM_MSG_DISCONNECT = 0x31, |
8995 | + USM_MSG_SUCCESS = 0x40, |
8996 | + USM_MSG_FAILED = 0x41, |
8997 | + |
8998 | + USM_MSG_MAX, |
8999 | +}; |
9000 | + |
9001 | +#ifdef CONFIG_NET |
9002 | +extern __init int suspend_usm_init(void); |
9003 | +extern __exit void suspend_usm_cleanup(void); |
9004 | +#else |
9005 | +#define suspend_usm_init() do { } while(0) |
9006 | +#define suspend_usb_cleanup() do { } while(0) |
9007 | +#endif |
9008 | diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c |
9009 | new file mode 100644 |
9010 | index 0000000..3de56ac |
9011 | --- /dev/null |
9012 | +++ b/kernel/power/suspend.c |
9013 | @@ -0,0 +1,1022 @@ |
9014 | +/* |
9015 | + * kernel/power/suspend.c |
9016 | + */ |
9017 | +/** \mainpage Suspend2. |
9018 | + * |
9019 | + * Suspend2 provides support for saving and restoring an image of |
9020 | + * system memory to an arbitrary storage device, either on the local computer, |
9021 | + * or across some network. The support is entirely OS based, so Suspend2 |
9022 | + * works without requiring BIOS, APM or ACPI support. The vast majority of the |
9023 | + * code is also architecture independant, so it should be very easy to port |
9024 | + * the code to new architectures. Suspend includes support for SMP, 4G HighMem |
9025 | + * and preemption. Initramfses and initrds are also supported. |
9026 | + * |
9027 | + * Suspend2 uses a modular design, in which the method of storing the image is |
9028 | + * completely abstracted from the core code, as are transformations on the data |
9029 | + * such as compression and/or encryption (multiple 'modules' can be used to |
9030 | + * provide arbitrary combinations of functionality). The user interface is also |
9031 | + * modular, so that arbitrarily simple or complex interfaces can be used to |
9032 | + * provide anything from debugging information through to eye candy. |
9033 | + * |
9034 | + * \section Copyright |
9035 | + * |
9036 | + * Suspend2 is released under the GPLv2. |
9037 | + * |
9038 | + * Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu><BR> |
9039 | + * Copyright (C) 1998,2001,2002 Pavel Machek <pavel@suse.cz><BR> |
9040 | + * Copyright (C) 2002-2003 Florent Chabaud <fchabaud@free.fr><BR> |
9041 | + * Copyright (C) 2002-2007 Nigel Cunningham (nigel at suspend2 net)<BR> |
9042 | + * |
9043 | + * \section Credits |
9044 | + * |
9045 | + * Nigel would like to thank the following people for their work: |
9046 | + * |
9047 | + * Bernard Blackham <bernard@blackham.com.au><BR> |
9048 | + * Web page & Wiki administration, some coding. A person without whom |
9049 | + * Suspend would not be where it is. |
9050 | + * |
9051 | + * Michael Frank <mhf@linuxmail.org><BR> |
9052 | + * Extensive testing and help with improving stability. I was constantly |
9053 | + * amazed by the quality and quantity of Michael's help. |
9054 | + * |
9055 | + * Pavel Machek <pavel@ucw.cz><BR> |
9056 | + * Modifications, defectiveness pointing, being with Gabor at the very beginning, |
9057 | + * suspend to swap space, stop all tasks. Port to 2.4.18-ac and 2.5.17. Even |
9058 | + * though Pavel and I disagree on the direction suspend to disk should take, I |
9059 | + * appreciate the valuable work he did in helping Gabor get the concept working. |
9060 | + * |
9061 | + * ..and of course the myriads of Suspend2 users who have helped diagnose |
9062 | + * and fix bugs, made suggestions on how to improve the code, proofread |
9063 | + * documentation, and donated time and money. |
9064 | + * |
9065 | + * Thanks also to corporate sponsors: |
9066 | + * |
9067 | + * <B>Redhat.</B>Sometime employer from May 2006 (my fault, not Redhat's!). |
9068 | + * |
9069 | + * <B>Cyclades.com.</B> Nigel's employers from Dec 2004 until May 2006, who |
9070 | + * allowed him to work on Suspend and PM related issues on company time. |
9071 | + * |
9072 | + * <B>LinuxFund.org.</B> Sponsored Nigel's work on Suspend for four months Oct 2003 |
9073 | + * to Jan 2004. |
9074 | + * |
9075 | + * <B>LAC Linux.</B> Donated P4 hardware that enabled development and ongoing |
9076 | + * maintenance of SMP and Highmem support. |
9077 | + * |
9078 | + * <B>OSDL.</B> Provided access to various hardware configurations, make occasional |
9079 | + * small donations to the project. |
9080 | + */ |
9081 | + |
9082 | +#include <linux/suspend.h> |
9083 | +#include <linux/module.h> |
9084 | +#include <linux/freezer.h> |
9085 | +#include <linux/utsrelease.h> |
9086 | +#include <linux/cpu.h> |
9087 | +#include <linux/console.h> |
9088 | +#include <asm/uaccess.h> |
9089 | + |
9090 | +#include "modules.h" |
9091 | +#include "sysfs.h" |
9092 | +#include "prepare_image.h" |
9093 | +#include "io.h" |
9094 | +#include "ui.h" |
9095 | +#include "power_off.h" |
9096 | +#include "storage.h" |
9097 | +#include "checksum.h" |
9098 | +#include "cluster.h" |
9099 | +#include "suspend2_builtin.h" |
9100 | + |
9101 | +/*! Pageset metadata. */ |
9102 | +struct pagedir pagedir2 = {2}; |
9103 | + |
9104 | +static int get_pmsem = 0, got_pmsem; |
9105 | +static mm_segment_t oldfs; |
9106 | +static atomic_t actions_running; |
9107 | +static int block_dump_save; |
9108 | +extern int block_dump; |
9109 | + |
9110 | +int do_suspend2_step(int step); |
9111 | + |
9112 | +/* |
9113 | + * Basic clean-up routine. |
9114 | + */ |
9115 | +void suspend_finish_anything(int suspend_or_resume) |
9116 | +{ |
9117 | + if (!atomic_dec_and_test(&actions_running)) |
9118 | + return; |
9119 | + |
9120 | + suspend_cleanup_modules(suspend_or_resume); |
9121 | + suspend_put_modules(); |
9122 | + clear_suspend_state(SUSPEND_RUNNING); |
9123 | + set_fs(oldfs); |
9124 | + if (suspend_or_resume) { |
9125 | + block_dump = block_dump_save; |
9126 | + set_cpus_allowed(current, CPU_MASK_ALL); |
9127 | + } |
9128 | +} |
9129 | + |
9130 | +/* |
9131 | + * Basic set-up routine. |
9132 | + */ |
9133 | +int suspend_start_anything(int suspend_or_resume) |
9134 | +{ |
9135 | + if (atomic_add_return(1, &actions_running) != 1) { |
9136 | + if (suspend_or_resume) { |
9137 | + printk("Can't start a cycle when actions are " |
9138 | + "already running.\n"); |
9139 | + atomic_dec(&actions_running); |
9140 | + return -EBUSY; |
9141 | + } else |
9142 | + return 0; |
9143 | + } |
9144 | + |
9145 | + oldfs = get_fs(); |
9146 | + set_fs(KERNEL_DS); |
9147 | + |
9148 | + if (!suspendActiveAllocator) { |
9149 | + /* Be quiet if we're not trying to suspend or resume */ |
9150 | + if (suspend_or_resume) |
9151 | + printk("No storage allocator is currently active. " |
9152 | + "Rechecking whether we can use one.\n"); |
9153 | + suspend_attempt_to_parse_resume_device(!suspend_or_resume); |
9154 | + } |
9155 | + |
9156 | + set_suspend_state(SUSPEND_RUNNING); |
9157 | + |
9158 | + if (suspend_get_modules()) { |
9159 | + printk("Suspend2: Get modules failed!\n"); |
9160 | + goto out_err; |
9161 | + } |
9162 | + |
9163 | + if (suspend_initialise_modules(suspend_or_resume)) { |
9164 | + printk("Suspend2: Initialise modules failed!\n"); |
9165 | + goto out_err; |
9166 | + } |
9167 | + |
9168 | + if (suspend_or_resume) { |
9169 | + block_dump_save = block_dump; |
9170 | + block_dump = 0; |
9171 | + set_cpus_allowed(current, CPU_MASK_CPU0); |
9172 | + } |
9173 | + |
9174 | + return 0; |
9175 | + |
9176 | +out_err: |
9177 | + if (suspend_or_resume) |
9178 | + block_dump_save = block_dump; |
9179 | + suspend_finish_anything(suspend_or_resume); |
9180 | + return -EBUSY; |
9181 | +} |
9182 | + |
9183 | +/* |
9184 | + * Allocate & free bitmaps. |
9185 | + */ |
9186 | +static int allocate_bitmaps(void) |
9187 | +{ |
9188 | + if (allocate_dyn_pageflags(&pageset1_map) || |
9189 | + allocate_dyn_pageflags(&pageset1_copy_map) || |
9190 | + allocate_dyn_pageflags(&pageset2_map) || |
9191 | + allocate_dyn_pageflags(&io_map) || |
9192 | + allocate_dyn_pageflags(&page_resave_map)) |
9193 | + return 1; |
9194 | + |
9195 | + return 0; |
9196 | +} |
9197 | + |
9198 | +static void free_bitmaps(void) |
9199 | +{ |
9200 | + free_dyn_pageflags(&pageset1_map); |
9201 | + free_dyn_pageflags(&pageset1_copy_map); |
9202 | + free_dyn_pageflags(&pageset2_map); |
9203 | + free_dyn_pageflags(&io_map); |
9204 | + free_dyn_pageflags(&page_resave_map); |
9205 | +} |
9206 | + |
9207 | +static int io_MB_per_second(int read_write) |
9208 | +{ |
9209 | + return (suspend_io_time[read_write][1]) ? |
9210 | + MB((unsigned long) suspend_io_time[read_write][0]) * HZ / |
9211 | + suspend_io_time[read_write][1] : 0; |
9212 | +} |
9213 | + |
9214 | +/* get_debug_info |
9215 | + * Functionality: Store debug info in a buffer. |
9216 | + */ |
9217 | +#define SNPRINTF(a...) len += snprintf_used(((char *)buffer) + len, \ |
9218 | + count - len - 1, ## a) |
9219 | +static int get_suspend_debug_info(const char *buffer, int count) |
9220 | +{ |
9221 | + int len = 0; |
9222 | + |
9223 | + SNPRINTF("Suspend2 debugging info:\n"); |
9224 | + SNPRINTF("- Suspend core : %s\n", SUSPEND_CORE_VERSION); |
9225 | + SNPRINTF("- Kernel Version : %s\n", UTS_RELEASE); |
9226 | + SNPRINTF("- Compiler vers. : %d.%d\n", __GNUC__, __GNUC_MINOR__); |
9227 | + SNPRINTF("- Attempt number : %d\n", nr_suspends); |
9228 | + SNPRINTF("- Parameters : %ld %ld %ld %d %d %ld\n", |
9229 | + suspend_result, |
9230 | + suspend_action, |
9231 | + suspend_debug_state, |
9232 | + suspend_default_console_level, |
9233 | + image_size_limit, |
9234 | + suspend2_poweroff_method); |
9235 | + SNPRINTF("- Overall expected compression percentage: %d.\n", |
9236 | + 100 - suspend_expected_compression_ratio()); |
9237 | + len+= suspend_print_module_debug_info(((char *) buffer) + len, |
9238 | + count - len - 1); |
9239 | + if (suspend_io_time[0][1]) { |
9240 | + if ((io_MB_per_second(0) < 5) || (io_MB_per_second(1) < 5)) { |
9241 | + SNPRINTF("- I/O speed: Write %d KB/s", |
9242 | + (KB((unsigned long) suspend_io_time[0][0]) * HZ / |
9243 | + suspend_io_time[0][1])); |
9244 | + if (suspend_io_time[1][1]) |
9245 | + SNPRINTF(", Read %d KB/s", |
9246 | + (KB((unsigned long) suspend_io_time[1][0]) * HZ / |
9247 | + suspend_io_time[1][1])); |
9248 | + } else { |
9249 | + SNPRINTF("- I/O speed: Write %d MB/s", |
9250 | + (MB((unsigned long) suspend_io_time[0][0]) * HZ / |
9251 | + suspend_io_time[0][1])); |
9252 | + if (suspend_io_time[1][1]) |
9253 | + SNPRINTF(", Read %d MB/s", |
9254 | + (MB((unsigned long) suspend_io_time[1][0]) * HZ / |
9255 | + suspend_io_time[1][1])); |
9256 | + } |
9257 | + SNPRINTF(".\n"); |
9258 | + } |
9259 | + else |
9260 | + SNPRINTF("- No I/O speed stats available.\n"); |
9261 | + SNPRINTF("- Extra pages : %d used/%d.\n", |
9262 | + extra_pd1_pages_used, extra_pd1_pages_allowance); |
9263 | + |
9264 | + return len; |
9265 | +} |
9266 | + |
9267 | +/* |
9268 | + * do_cleanup |
9269 | + */ |
9270 | + |
9271 | +static void do_cleanup(int get_debug_info) |
9272 | +{ |
9273 | + int i = 0; |
9274 | + char *buffer = NULL; |
9275 | + |
9276 | + if (get_debug_info) |
9277 | + suspend_prepare_status(DONT_CLEAR_BAR, "Cleaning up..."); |
9278 | + relink_lru_lists(); |
9279 | + |
9280 | + free_checksum_pages(); |
9281 | + |
9282 | + if (get_debug_info) |
9283 | + buffer = (char *) get_zeroed_page(GFP_ATOMIC); |
9284 | + |
9285 | + if (buffer) |
9286 | + i = get_suspend_debug_info(buffer, PAGE_SIZE); |
9287 | + |
9288 | + suspend_free_extra_pagedir_memory(); |
9289 | + |
9290 | + pagedir1.size = pagedir2.size = 0; |
9291 | + set_highmem_size(pagedir1, 0); |
9292 | + set_highmem_size(pagedir2, 0); |
9293 | + |
9294 | + restore_avenrun(); |
9295 | + |
9296 | + thaw_processes(); |
9297 | + |
9298 | +#ifdef CONFIG_SUSPEND2_KEEP_IMAGE |
9299 | + if (test_action_state(SUSPEND_KEEP_IMAGE) && |
9300 | + !test_result_state(SUSPEND_ABORTED)) { |
9301 | + suspend_message(SUSPEND_ANY_SECTION, SUSPEND_LOW, 1, |
9302 | + "Suspend2: Not invalidating the image due " |
9303 | + "to Keep Image being enabled.\n"); |
9304 | + set_result_state(SUSPEND_KEPT_IMAGE); |
9305 | + } else |
9306 | +#endif |
9307 | + if (suspendActiveAllocator) |
9308 | + suspendActiveAllocator->invalidate_image(); |
9309 | + |
9310 | + free_bitmaps(); |
9311 | + |
9312 | + if (buffer && i) { |
9313 | + /* Printk can only handle 1023 bytes, including |
9314 | + * its level mangling. */ |
9315 | + for (i = 0; i < 3; i++) |
9316 | + printk("%s", buffer + (1023 * i)); |
9317 | + free_page((unsigned long) buffer); |
9318 | + } |
9319 | + |
9320 | + if (!test_action_state(SUSPEND_LATE_CPU_HOTPLUG)) |
9321 | + enable_nonboot_cpus(); |
9322 | + suspend_cleanup_console(); |
9323 | + |
9324 | + suspend_deactivate_storage(0); |
9325 | + |
9326 | + clear_suspend_state(SUSPEND_IGNORE_LOGLEVEL); |
9327 | + clear_suspend_state(SUSPEND_TRYING_TO_RESUME); |
9328 | + clear_suspend_state(SUSPEND_NOW_RESUMING); |
9329 | + |
9330 | + if (got_pmsem) { |
9331 | + mutex_unlock(&pm_mutex); |
9332 | + got_pmsem = 0; |
9333 | + } |
9334 | +} |
9335 | + |
9336 | +static int check_still_keeping_image(void) |
9337 | +{ |
9338 | + if (test_action_state(SUSPEND_KEEP_IMAGE)) { |
9339 | + printk("Image already stored: powering down immediately."); |
9340 | + do_suspend2_step(STEP_SUSPEND_POWERDOWN); |
9341 | + return 1; /* Just in case we're using S3 */ |
9342 | + } |
9343 | + |
9344 | + printk("Invalidating previous image.\n"); |
9345 | + suspendActiveAllocator->invalidate_image(); |
9346 | + |
9347 | + return 0; |
9348 | +} |
9349 | + |
9350 | +static int suspend_init(void) |
9351 | +{ |
9352 | + suspend_result = 0; |
9353 | + |
9354 | + printk(KERN_INFO "Suspend2: Initiating a software suspend cycle.\n"); |
9355 | + |
9356 | + nr_suspends++; |
9357 | + |
9358 | + save_avenrun(); |
9359 | + |
9360 | + suspend_io_time[0][0] = suspend_io_time[0][1] = |
9361 | + suspend_io_time[1][0] = suspend_io_time[1][1] = 0; |
9362 | + |
9363 | + if (!test_suspend_state(SUSPEND_CAN_SUSPEND) || |
9364 | + allocate_bitmaps()) |
9365 | + return 0; |
9366 | + |
9367 | + suspend_prepare_console(); |
9368 | + if (test_action_state(SUSPEND_LATE_CPU_HOTPLUG) || |
9369 | + !disable_nonboot_cpus()) |
9370 | + return 1; |
9371 | + |
9372 | + set_result_state(SUSPEND_CPU_HOTPLUG_FAILED); |
9373 | + set_result_state(SUSPEND_ABORTED); |
9374 | + return 0; |
9375 | +} |
9376 | + |
9377 | +static int can_suspend(void) |
9378 | +{ |
9379 | + if (get_pmsem) { |
9380 | + if (!mutex_trylock(&pm_mutex)) { |
9381 | + printk("Suspend2: Failed to obtain pm_mutex.\n"); |
9382 | + dump_stack(); |
9383 | + set_result_state(SUSPEND_ABORTED); |
9384 | + set_result_state(SUSPEND_PM_SEM); |
9385 | + return 0; |
9386 | + } |
9387 | + got_pmsem = 1; |
9388 | + } |
9389 | + |
9390 | + if (!test_suspend_state(SUSPEND_CAN_SUSPEND)) |
9391 | + suspend_attempt_to_parse_resume_device(0); |
9392 | + |
9393 | + if (!test_suspend_state(SUSPEND_CAN_SUSPEND)) { |
9394 | + printk("Suspend2: Software suspend is disabled.\n" |
9395 | + "This may be because you haven't put something along " |
9396 | + "the lines of\n\nresume2=swap:/dev/hda1\n\n" |
9397 | + "in lilo.conf or equivalent. (Where /dev/hda1 is your " |
9398 | + "swap partition).\n"); |
9399 | + set_result_state(SUSPEND_ABORTED); |
9400 | + if (!got_pmsem) { |
9401 | + mutex_unlock(&pm_mutex); |
9402 | + got_pmsem = 0; |
9403 | + } |
9404 | + return 0; |
9405 | + } |
9406 | + |
9407 | + return 1; |
9408 | +} |
9409 | + |
9410 | +static int do_power_down(void) |
9411 | +{ |
9412 | + /* If switching images fails, do normal powerdown */ |
9413 | + if (poweroff_resume2[0]) |
9414 | + do_suspend2_step(STEP_RESUME_ALT_IMAGE); |
9415 | + |
9416 | + suspend_cond_pause(1, "About to power down or reboot."); |
9417 | + suspend2_power_down(); |
9418 | + |
9419 | + /* If we return, it's because we suspended to ram */ |
9420 | + if (read_pageset2(1)) |
9421 | + panic("Attempt to reload pagedir 2 failed. Try rebooting."); |
9422 | + |
9423 | + barrier(); |
9424 | + mb(); |
9425 | + do_cleanup(1); |
9426 | + return 0; |
9427 | +} |
9428 | + |
9429 | +/* |
9430 | + * __save_image |
9431 | + * Functionality : High level routine which performs the steps necessary |
9432 | + * to save the image after preparatory steps have been taken. |
9433 | + * Key Assumptions : Processes frozen, sufficient memory available, drivers |
9434 | + * suspended. |
9435 | + */ |
9436 | +static int __save_image(void) |
9437 | +{ |
9438 | + int temp_result; |
9439 | + |
9440 | + suspend_prepare_status(DONT_CLEAR_BAR, "Starting to save the image.."); |
9441 | + |
9442 | + suspend_message(SUSPEND_ANY_SECTION, SUSPEND_LOW, 1, |
9443 | + " - Final values: %d and %d.\n", |
9444 | + pagedir1.size, pagedir2.size); |
9445 | + |
9446 | + suspend_cond_pause(1, "About to write pagedir2."); |
9447 | + |
9448 | + calculate_check_checksums(0); |
9449 | + |
9450 | + temp_result = write_pageset(&pagedir2); |
9451 | + |
9452 | + if (temp_result == -1 || test_result_state(SUSPEND_ABORTED)) |
9453 | + return 1; |
9454 | + |
9455 | + suspend_cond_pause(1, "About to copy pageset 1."); |
9456 | + |
9457 | + if (test_result_state(SUSPEND_ABORTED)) |
9458 | + return 1; |
9459 | + |
9460 | + suspend_deactivate_storage(1); |
9461 | + |
9462 | + suspend_prepare_status(DONT_CLEAR_BAR, "Doing atomic copy."); |
9463 | + |
9464 | + suspend2_in_suspend = 1; |
9465 | + |
9466 | + suspend_console(); |
9467 | + if (device_suspend(PMSG_FREEZE)) { |
9468 | + set_result_state(SUSPEND_DEVICE_REFUSED); |
9469 | + set_result_state(SUSPEND_ABORTED); |
9470 | + goto ResumeConsole; |
9471 | + } |
9472 | + |
9473 | + if (test_action_state(SUSPEND_LATE_CPU_HOTPLUG) && |
9474 | + disable_nonboot_cpus()) { |
9475 | + set_result_state(SUSPEND_CPU_HOTPLUG_FAILED); |
9476 | + set_result_state(SUSPEND_ABORTED); |
9477 | + } else |
9478 | + temp_result = suspend2_suspend(); |
9479 | + |
9480 | + /* We return here at resume time too! */ |
9481 | + if (!suspend2_in_suspend && pm_ops && pm_ops->finish && |
9482 | + suspend2_poweroff_method > 3) |
9483 | + pm_ops->finish(suspend2_poweroff_method); |
9484 | + |
9485 | + if (test_action_state(SUSPEND_LATE_CPU_HOTPLUG)) |
9486 | + enable_nonboot_cpus(); |
9487 | + |
9488 | + device_resume(); |
9489 | + |
9490 | +ResumeConsole: |
9491 | + resume_console(); |
9492 | + |
9493 | + if (suspend_activate_storage(1)) |
9494 | + panic("Failed to reactivate our storage."); |
9495 | + |
9496 | + if (temp_result || test_result_state(SUSPEND_ABORTED)) |
9497 | + return 1; |
9498 | + |
9499 | + /* Resume time? */ |
9500 | + if (!suspend2_in_suspend) { |
9501 | + copyback_post(); |
9502 | + return 0; |
9503 | + } |
9504 | + |
9505 | + /* Nope. Suspending. So, see if we can save the image... */ |
9506 | + |
9507 | + suspend_update_status(pagedir2.size, |
9508 | + pagedir1.size + pagedir2.size, |
9509 | + NULL); |
9510 | + |
9511 | + if (test_result_state(SUSPEND_ABORTED)) |
9512 | + goto abort_reloading_pagedir_two; |
9513 | + |
9514 | + suspend_cond_pause(1, "About to write pageset1."); |
9515 | + |
9516 | + suspend_message(SUSPEND_ANY_SECTION, SUSPEND_LOW, 1, |
9517 | + "-- Writing pageset1\n"); |
9518 | + |
9519 | + temp_result = write_pageset(&pagedir1); |
9520 | + |
9521 | + /* We didn't overwrite any memory, so no reread needs to be done. */ |
9522 | + if (test_action_state(SUSPEND_TEST_FILTER_SPEED)) |
9523 | + return 1; |
9524 | + |
9525 | + if (temp_result == 1 || test_result_state(SUSPEND_ABORTED)) |
9526 | + goto abort_reloading_pagedir_two; |
9527 | + |
9528 | + suspend_cond_pause(1, "About to write header."); |
9529 | + |
9530 | + if (test_result_state(SUSPEND_ABORTED)) |
9531 | + goto abort_reloading_pagedir_two; |
9532 | + |
9533 | + temp_result = write_image_header(); |
9534 | + |
9535 | + if (test_action_state(SUSPEND_TEST_BIO)) |
9536 | + return 1; |
9537 | + |
9538 | + if (!temp_result && !test_result_state(SUSPEND_ABORTED)) |
9539 | + return 0; |
9540 | + |
9541 | +abort_reloading_pagedir_two: |
9542 | + temp_result = read_pageset2(1); |
9543 | + |
9544 | + /* If that failed, we're sunk. Panic! */ |
9545 | + if (temp_result) |
9546 | + panic("Attempt to reload pagedir 2 while aborting " |
9547 | + "a suspend failed."); |
9548 | + |
9549 | + return 1; |
9550 | +} |
9551 | + |
9552 | +/* |
9553 | + * do_save_image |
9554 | + * |
9555 | + * Save the prepared image. |
9556 | + */ |
9557 | + |
9558 | +static int do_save_image(void) |
9559 | +{ |
9560 | + int result = __save_image(); |
9561 | + if (!suspend2_in_suspend || result) |
9562 | + do_cleanup(1); |
9563 | + return result; |
9564 | +} |
9565 | + |
9566 | + |
9567 | +/* do_prepare_image |
9568 | + * |
9569 | + * Seek to initialise and prepare an image to be saved. On failure, |
9570 | + * cleanup. |
9571 | + */ |
9572 | + |
9573 | +static int do_prepare_image(void) |
9574 | +{ |
9575 | + if (suspend_activate_storage(0)) |
9576 | + return 1; |
9577 | + |
9578 | + /* |
9579 | + * If kept image and still keeping image and suspending to RAM, we will |
9580 | + * return 1 after suspending and resuming (provided the power doesn't |
9581 | + * run out. |
9582 | + */ |
9583 | + |
9584 | + if (!can_suspend() || |
9585 | + (test_result_state(SUSPEND_KEPT_IMAGE) && |
9586 | + check_still_keeping_image())) |
9587 | + goto cleanup; |
9588 | + |
9589 | + if (suspend_init() && !suspend_prepare_image() && |
9590 | + !test_result_state(SUSPEND_ABORTED)) |
9591 | + return 0; |
9592 | + |
9593 | +cleanup: |
9594 | + do_cleanup(0); |
9595 | + return 1; |
9596 | +} |
9597 | + |
9598 | +static int do_check_can_resume(void) |
9599 | +{ |
9600 | + char *buf = (char *) get_zeroed_page(GFP_KERNEL); |
9601 | + int result = 0; |
9602 | + |
9603 | + if (!buf) |
9604 | + return 0; |
9605 | + |
9606 | + /* Only interested in first byte, so throw away return code. */ |
9607 | + image_exists_read(buf, PAGE_SIZE); |
9608 | + |
9609 | + if (buf[0] == '1') |
9610 | + result = 1; |
9611 | + |
9612 | + free_page((unsigned long) buf); |
9613 | + return result; |
9614 | +} |
9615 | + |
9616 | +/* |
9617 | + * We check if we have an image and if so we try to resume. |
9618 | + */ |
9619 | +static int do_load_atomic_copy(void) |
9620 | +{ |
9621 | + int read_image_result = 0; |
9622 | + |
9623 | + if (sizeof(swp_entry_t) != sizeof(long)) { |
9624 | + printk(KERN_WARNING "Suspend2: The size of swp_entry_t != size" |
9625 | + " of long. Please report this!\n"); |
9626 | + return 1; |
9627 | + } |
9628 | + |
9629 | + if (!resume2_file[0]) |
9630 | + printk(KERN_WARNING "Suspend2: " |
9631 | + "You need to use a resume2= command line parameter to " |
9632 | + "tell Suspend2 where to look for an image.\n"); |
9633 | + |
9634 | + suspend_activate_storage(0); |
9635 | + |
9636 | + if (!(test_suspend_state(SUSPEND_RESUME_DEVICE_OK)) && |
9637 | + !suspend_attempt_to_parse_resume_device(0)) { |
9638 | + /* |
9639 | + * Without a usable storage device we can do nothing - |
9640 | + * even if noresume is given |
9641 | + */ |
9642 | + |
9643 | + if (!suspendNumAllocators) |
9644 | + printk(KERN_ALERT "Suspend2: " |
9645 | + "No storage allocators have been registered.\n"); |
9646 | + else |
9647 | + printk(KERN_ALERT "Suspend2: " |
9648 | + "Missing or invalid storage location " |
9649 | + "(resume2= parameter). Please correct and " |
9650 | + "rerun lilo (or equivalent) before " |
9651 | + "suspending.\n"); |
9652 | + suspend_deactivate_storage(0); |
9653 | + return 1; |
9654 | + } |
9655 | + |
9656 | + read_image_result = read_pageset1(); /* non fatal error ignored */ |
9657 | + |
9658 | + if (test_suspend_state(SUSPEND_NORESUME_SPECIFIED)) { |
9659 | + printk(KERN_WARNING "Suspend2: Resuming disabled as requested.\n"); |
9660 | + clear_suspend_state(SUSPEND_NORESUME_SPECIFIED); |
9661 | + } |
9662 | + |
9663 | + suspend_deactivate_storage(0); |
9664 | + |
9665 | + if (read_image_result) |
9666 | + return 1; |
9667 | + |
9668 | + return 0; |
9669 | +} |
9670 | + |
9671 | +static void prepare_restore_load_alt_image(int prepare) |
9672 | +{ |
9673 | + static dyn_pageflags_t pageset1_map_save, pageset1_copy_map_save; |
9674 | + |
9675 | + if (prepare) { |
9676 | + pageset1_map_save = pageset1_map; |
9677 | + pageset1_map = NULL; |
9678 | + pageset1_copy_map_save = pageset1_copy_map; |
9679 | + pageset1_copy_map = NULL; |
9680 | + set_suspend_state(SUSPEND_LOADING_ALT_IMAGE); |
9681 | + suspend_reset_alt_image_pageset2_pfn(); |
9682 | + } else { |
9683 | + if (pageset1_map) |
9684 | + free_dyn_pageflags(&pageset1_map); |
9685 | + pageset1_map = pageset1_map_save; |
9686 | + if (pageset1_copy_map) |
9687 | + free_dyn_pageflags(&pageset1_copy_map); |
9688 | + pageset1_copy_map = pageset1_copy_map_save; |
9689 | + clear_suspend_state(SUSPEND_NOW_RESUMING); |
9690 | + clear_suspend_state(SUSPEND_LOADING_ALT_IMAGE); |
9691 | + } |
9692 | +} |
9693 | + |
9694 | +int pre_resume_freeze(void) |
9695 | +{ |
9696 | + if (!test_action_state(SUSPEND_LATE_CPU_HOTPLUG)) { |
9697 | + suspend_prepare_status(DONT_CLEAR_BAR, "Disable nonboot cpus."); |
9698 | + if (disable_nonboot_cpus()) { |
9699 | + set_result_state(SUSPEND_CPU_HOTPLUG_FAILED); |
9700 | + set_result_state(SUSPEND_ABORTED); |
9701 | + return 1; |
9702 | + } |
9703 | + } |
9704 | + |
9705 | + suspend_prepare_status(DONT_CLEAR_BAR, "Freeze processes."); |
9706 | + |
9707 | + if (freeze_processes()) { |
9708 | + printk("Some processes failed to suspend\n"); |
9709 | + return 1; |
9710 | + } |
9711 | + |
9712 | + return 0; |
9713 | +} |
9714 | + |
9715 | +void post_resume_thaw(void) |
9716 | +{ |
9717 | + thaw_processes(); |
9718 | + if (!test_action_state(SUSPEND_LATE_CPU_HOTPLUG)) |
9719 | + enable_nonboot_cpus(); |
9720 | +} |
9721 | + |
9722 | +int do_suspend2_step(int step) |
9723 | +{ |
9724 | + int result; |
9725 | + |
9726 | + switch (step) { |
9727 | + case STEP_SUSPEND_PREPARE_IMAGE: |
9728 | + return do_prepare_image(); |
9729 | + case STEP_SUSPEND_SAVE_IMAGE: |
9730 | + return do_save_image(); |
9731 | + case STEP_SUSPEND_POWERDOWN: |
9732 | + return do_power_down(); |
9733 | + case STEP_RESUME_CAN_RESUME: |
9734 | + return do_check_can_resume(); |
9735 | + case STEP_RESUME_LOAD_PS1: |
9736 | + return do_load_atomic_copy(); |
9737 | + case STEP_RESUME_DO_RESTORE: |
9738 | + /* |
9739 | + * If we succeed, this doesn't return. |
9740 | + * Instead, we return from do_save_image() in the |
9741 | + * suspended kernel. |
9742 | + */ |
9743 | + result = suspend_atomic_restore(); |
9744 | + if (result) |
9745 | + post_resume_thaw(); |
9746 | + return result; |
9747 | + case STEP_RESUME_ALT_IMAGE: |
9748 | + printk("Trying to resume alternate image.\n"); |
9749 | + suspend2_in_suspend = 0; |
9750 | + save_restore_resume2(SAVE, NOQUIET); |
9751 | + prepare_restore_load_alt_image(1); |
9752 | + if (!do_check_can_resume()) { |
9753 | + printk("Nothing to resume from.\n"); |
9754 | + goto out; |
9755 | + } |
9756 | + if (!do_load_atomic_copy()) { |
9757 | + printk("Failed to load image.\n"); |
9758 | + suspend_atomic_restore(); |
9759 | + } |
9760 | +out: |
9761 | + prepare_restore_load_alt_image(0); |
9762 | + save_restore_resume2(RESTORE, NOQUIET); |
9763 | + break; |
9764 | + } |
9765 | + |
9766 | + return 0; |
9767 | +} |
9768 | + |
9769 | +/* -- Functions for kickstarting a suspend or resume --- */ |
9770 | + |
9771 | +/* |
9772 | + * Check if we have an image and if so try to resume. |
9773 | + */ |
9774 | +void __suspend2_try_resume(void) |
9775 | +{ |
9776 | + set_suspend_state(SUSPEND_TRYING_TO_RESUME); |
9777 | + resume_attempted = 1; |
9778 | + |
9779 | + if (do_suspend2_step(STEP_RESUME_CAN_RESUME) && |
9780 | + !do_suspend2_step(STEP_RESUME_LOAD_PS1)) |
9781 | + do_suspend2_step(STEP_RESUME_DO_RESTORE); |
9782 | + |
9783 | + do_cleanup(0); |
9784 | + |
9785 | + clear_suspend_state(SUSPEND_IGNORE_LOGLEVEL); |
9786 | + clear_suspend_state(SUSPEND_TRYING_TO_RESUME); |
9787 | + clear_suspend_state(SUSPEND_NOW_RESUMING); |
9788 | +} |
9789 | + |
9790 | +/* Wrapper for when called from init/do_mounts.c */ |
9791 | +void _suspend2_try_resume(void) |
9792 | +{ |
9793 | + resume_attempted = 1; |
9794 | + |
9795 | + if (suspend_start_anything(SYSFS_RESUMING)) |
9796 | + return; |
9797 | + |
9798 | + /* Unlock will be done in do_cleanup */ |
9799 | + mutex_lock(&pm_mutex); |
9800 | + got_pmsem = 1; |
9801 | + |
9802 | + __suspend2_try_resume(); |
9803 | + |
9804 | + /* |
9805 | + * For initramfs, we have to clear the boot time |
9806 | + * flag after trying to resume |
9807 | + */ |
9808 | + clear_suspend_state(SUSPEND_BOOT_TIME); |
9809 | + suspend_finish_anything(SYSFS_RESUMING); |
9810 | +} |
9811 | + |
9812 | +/* |
9813 | + * _suspend2_try_suspend |
9814 | + * Functionality : |
9815 | + * Called From : drivers/acpi/sleep/main.c |
9816 | + * kernel/reboot.c |
9817 | + */ |
9818 | +int _suspend2_try_suspend(int have_pmsem) |
9819 | +{ |
9820 | + int result = 0, sys_power_disk = 0; |
9821 | + |
9822 | + if (!atomic_read(&actions_running)) { |
9823 | + /* Came in via /sys/power/disk */ |
9824 | + if (suspend_start_anything(SYSFS_SUSPENDING)) |
9825 | + return -EBUSY; |
9826 | + sys_power_disk = 1; |
9827 | + } |
9828 | + |
9829 | + get_pmsem = !have_pmsem; |
9830 | + |
9831 | + if (strlen(poweroff_resume2)) { |
9832 | + attempt_to_parse_po_resume_device2(); |
9833 | + |
9834 | + if (!strlen(poweroff_resume2)) { |
9835 | + printk("Poweroff resume2 now invalid. Aborting.\n"); |
9836 | + goto out; |
9837 | + } |
9838 | + } |
9839 | + |
9840 | + if ((result = do_suspend2_step(STEP_SUSPEND_PREPARE_IMAGE))) |
9841 | + goto out; |
9842 | + |
9843 | + if (test_action_state(SUSPEND_FREEZER_TEST)) { |
9844 | + do_cleanup(0); |
9845 | + goto out; |
9846 | + } |
9847 | + |
9848 | + if ((result = do_suspend2_step(STEP_SUSPEND_SAVE_IMAGE))) |
9849 | + goto out; |
9850 | + |
9851 | + /* This code runs at resume time too! */ |
9852 | + if (suspend2_in_suspend) |
9853 | + result = do_suspend2_step(STEP_SUSPEND_POWERDOWN); |
9854 | +out: |
9855 | + if (sys_power_disk) |
9856 | + suspend_finish_anything(SYSFS_SUSPENDING); |
9857 | + return result; |
9858 | +} |
9859 | + |
9860 | +/* |
9861 | + * This array contains entries that are automatically registered at |
9862 | + * boot. Modules and the console code register their own entries separately. |
9863 | + */ |
9864 | +static struct suspend_sysfs_data sysfs_params[] = { |
9865 | + { SUSPEND2_ATTR("extra_pages_allowance", SYSFS_RW), |
9866 | + SYSFS_INT(&extra_pd1_pages_allowance, 0, INT_MAX, 0) |
9867 | + }, |
9868 | + |
9869 | + { SUSPEND2_ATTR("image_exists", SYSFS_RW), |
9870 | + SYSFS_CUSTOM(image_exists_read, image_exists_write, |
9871 | + SYSFS_NEEDS_SM_FOR_BOTH) |
9872 | + }, |
9873 | + |
9874 | + { SUSPEND2_ATTR("resume2", SYSFS_RW), |
9875 | + SYSFS_STRING(resume2_file, 255, SYSFS_NEEDS_SM_FOR_WRITE), |
9876 | + .write_side_effect = attempt_to_parse_resume_device2, |
9877 | + }, |
9878 | + |
9879 | + { SUSPEND2_ATTR("poweroff_resume2", SYSFS_RW), |
9880 | + SYSFS_STRING(poweroff_resume2, 255, SYSFS_NEEDS_SM_FOR_WRITE), |
9881 | + .write_side_effect = attempt_to_parse_po_resume_device2, |
9882 | + }, |
9883 | + { SUSPEND2_ATTR("debug_info", SYSFS_READONLY), |
9884 | + SYSFS_CUSTOM(get_suspend_debug_info, NULL, 0) |
9885 | + }, |
9886 | + |
9887 | + { SUSPEND2_ATTR("ignore_rootfs", SYSFS_RW), |
9888 | + SYSFS_BIT(&suspend_action, SUSPEND_IGNORE_ROOTFS, 0) |
9889 | + }, |
9890 | + |
9891 | + { SUSPEND2_ATTR("image_size_limit", SYSFS_RW), |
9892 | + SYSFS_INT(&image_size_limit, -2, INT_MAX, 0) |
9893 | + }, |
9894 | + |
9895 | + { SUSPEND2_ATTR("last_result", SYSFS_RW), |
9896 | + SYSFS_UL(&suspend_result, 0, 0, 0) |
9897 | + }, |
9898 | + |
9899 | + { SUSPEND2_ATTR("no_multithreaded_io", SYSFS_RW), |
9900 | + SYSFS_BIT(&suspend_action, SUSPEND_NO_MULTITHREADED_IO, 0) |
9901 | + }, |
9902 | + |
9903 | + { SUSPEND2_ATTR("full_pageset2", SYSFS_RW), |
9904 | + SYSFS_BIT(&suspend_action, SUSPEND_PAGESET2_FULL, 0) |
9905 | + }, |
9906 | + |
9907 | + { SUSPEND2_ATTR("reboot", SYSFS_RW), |
9908 | + SYSFS_BIT(&suspend_action, SUSPEND_REBOOT, 0) |
9909 | + }, |
9910 | + |
9911 | +#ifdef CONFIG_SOFTWARE_SUSPEND |
9912 | + { SUSPEND2_ATTR("replace_swsusp", SYSFS_RW), |
9913 | + SYSFS_BIT(&suspend_action, SUSPEND_REPLACE_SWSUSP, 0) |
9914 | + }, |
9915 | +#endif |
9916 | + |
9917 | + { SUSPEND2_ATTR("resume_commandline", SYSFS_RW), |
9918 | + SYSFS_STRING(suspend2_nosave_commandline, COMMAND_LINE_SIZE, 0) |
9919 | + }, |
9920 | + |
9921 | + { SUSPEND2_ATTR("version", SYSFS_READONLY), |
9922 | + SYSFS_STRING(SUSPEND_CORE_VERSION, 0, 0) |
9923 | + }, |
9924 | + |
9925 | + { SUSPEND2_ATTR("no_load_direct", SYSFS_RW), |
9926 | + SYSFS_BIT(&suspend_action, SUSPEND_NO_DIRECT_LOAD, 0) |
9927 | + }, |
9928 | + |
9929 | + { SUSPEND2_ATTR("freezer_test", SYSFS_RW), |
9930 | + SYSFS_BIT(&suspend_action, SUSPEND_FREEZER_TEST, 0) |
9931 | + }, |
9932 | + |
9933 | + { SUSPEND2_ATTR("test_bio", SYSFS_RW), |
9934 | + SYSFS_BIT(&suspend_action, SUSPEND_TEST_BIO, 0) |
9935 | + }, |
9936 | + |
9937 | + { SUSPEND2_ATTR("test_filter_speed", SYSFS_RW), |
9938 | + SYSFS_BIT(&suspend_action, SUSPEND_TEST_FILTER_SPEED, 0) |
9939 | + }, |
9940 | + |
9941 | + { SUSPEND2_ATTR("slow", SYSFS_RW), |
9942 | + SYSFS_BIT(&suspend_action, SUSPEND_SLOW, 0) |
9943 | + }, |
9944 | + |
9945 | + { SUSPEND2_ATTR("no_pageset2", SYSFS_RW), |
9946 | + SYSFS_BIT(&suspend_action, SUSPEND_NO_PAGESET2, 0) |
9947 | + }, |
9948 | + |
9949 | + { SUSPEND2_ATTR("late_cpu_hotplug", SYSFS_RW), |
9950 | + SYSFS_BIT(&suspend_action, SUSPEND_LATE_CPU_HOTPLUG, 0) |
9951 | + }, |
9952 | + |
9953 | +#if defined(CONFIG_ACPI) |
9954 | + { SUSPEND2_ATTR("powerdown_method", SYSFS_RW), |
9955 | + SYSFS_UL(&suspend2_poweroff_method, 0, 5, 0) |
9956 | + }, |
9957 | +#endif |
9958 | + |
9959 | +#ifdef CONFIG_SUSPEND2_KEEP_IMAGE |
9960 | + { SUSPEND2_ATTR("keep_image", SYSFS_RW), |
9961 | + SYSFS_BIT(&suspend_action, SUSPEND_KEEP_IMAGE, 0) |
9962 | + }, |
9963 | +#endif |
9964 | +}; |
9965 | + |
9966 | +struct suspend2_core_fns my_fns = { |
9967 | + .get_nonconflicting_page = __suspend_get_nonconflicting_page, |
9968 | + .post_context_save = __suspend_post_context_save, |
9969 | + .try_suspend = _suspend2_try_suspend, |
9970 | + .try_resume = _suspend2_try_resume, |
9971 | +}; |
9972 | + |
9973 | +static __init int core_load(void) |
9974 | +{ |
9975 | + int i, |
9976 | + numfiles = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data); |
9977 | + |
9978 | + printk("Suspend v" SUSPEND_CORE_VERSION "\n"); |
9979 | + |
9980 | + if (s2_sysfs_init()) |
9981 | + return 1; |
9982 | + |
9983 | + for (i=0; i< numfiles; i++) |
9984 | + suspend_register_sysfs_file(&suspend2_subsys.kset.kobj, |
9985 | + &sysfs_params[i]); |
9986 | + |
9987 | + s2_core_fns = &my_fns; |
9988 | + |
9989 | + if (s2_checksum_init()) |
9990 | + return 1; |
9991 | + if (s2_cluster_init()) |
9992 | + return 1; |
9993 | + if (s2_usm_init()) |
9994 | + return 1; |
9995 | + if (s2_ui_init()) |
9996 | + return 1; |
9997 | + |
9998 | +#ifdef CONFIG_SOFTWARE_SUSPEND |
9999 | + /* Overriding resume2= with resume=? */ |
10000 | + if (test_action_state(SUSPEND_REPLACE_SWSUSP) && resume_file[0]) |
10001 | + strncpy(resume2_file, resume_file, 256); |
10002 | +#endif |
10003 | + |
10004 | + return 0; |
10005 | +} |
10006 | + |
10007 | +#ifdef MODULE |
10008 | +static __exit void core_unload(void) |
10009 | +{ |
10010 | + int i, |
10011 | + numfiles = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data); |
10012 | + |
10013 | + s2_ui_exit(); |
10014 | + s2_checksum_exit(); |
10015 | + s2_cluster_exit(); |
10016 | + s2_usm_exit(); |
10017 | + |
10018 | + for (i=0; i< numfiles; i++) |
10019 | + suspend_unregister_sysfs_file(&suspend2_subsys.kset.kobj, |
10020 | + &sysfs_params[i]); |
10021 | + |
10022 | + s2_core_fns = NULL; |
10023 | + |
10024 | + s2_sysfs_exit(); |
10025 | +} |
10026 | +MODULE_LICENSE("GPL"); |
10027 | +module_init(core_load); |
10028 | +module_exit(core_unload); |
10029 | +#else |
10030 | +late_initcall(core_load); |
10031 | +#endif |
10032 | + |
10033 | +#ifdef CONFIG_SUSPEND2_EXPORTS |
10034 | +EXPORT_SYMBOL_GPL(pagedir2); |
10035 | +#endif |
10036 | diff --git a/kernel/power/suspend.h b/kernel/power/suspend.h |
10037 | new file mode 100644 |
10038 | index 0000000..81e752d |
10039 | --- /dev/null |
10040 | +++ b/kernel/power/suspend.h |
10041 | @@ -0,0 +1,182 @@ |
10042 | +/* |
10043 | + * kernel/power/suspend.h |
10044 | + * |
10045 | + * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
10046 | + * |
10047 | + * This file is released under the GPLv2. |
10048 | + * |
10049 | + * It contains declarations used throughout swsusp. |
10050 | + * |
10051 | + */ |
10052 | + |
10053 | +#ifndef KERNEL_POWER_SUSPEND_H |
10054 | +#define KERNEL_POWER_SUSPEND_H |
10055 | + |
10056 | +#include <linux/delay.h> |
10057 | +#include <linux/bootmem.h> |
10058 | +#include <linux/suspend.h> |
10059 | +#include <linux/dyn_pageflags.h> |
10060 | +#include <asm/setup.h> |
10061 | +#include "pageflags.h" |
10062 | + |
10063 | +#define SUSPEND_CORE_VERSION "2.2.9.17" |
10064 | + |
10065 | +/* == Action states == */ |
10066 | + |
10067 | +enum { |
10068 | + SUSPEND_REBOOT, |
10069 | + SUSPEND_PAUSE, |
10070 | + SUSPEND_SLOW, |
10071 | + SUSPEND_LOGALL, |
10072 | + SUSPEND_CAN_CANCEL, |
10073 | + SUSPEND_KEEP_IMAGE, |
10074 | + SUSPEND_FREEZER_TEST, |
10075 | + SUSPEND_SINGLESTEP, |
10076 | + SUSPEND_PAUSE_NEAR_PAGESET_END, |
10077 | + SUSPEND_TEST_FILTER_SPEED, |
10078 | + SUSPEND_TEST_BIO, |
10079 | + SUSPEND_NO_PAGESET2, |
10080 | + SUSPEND_PM_PREPARE_CONSOLE, |
10081 | + SUSPEND_IGNORE_ROOTFS, |
10082 | + SUSPEND_REPLACE_SWSUSP, |
10083 | + SUSPEND_RETRY_RESUME, |
10084 | + SUSPEND_PAGESET2_FULL, |
10085 | + SUSPEND_ABORT_ON_RESAVE_NEEDED, |
10086 | + SUSPEND_NO_MULTITHREADED_IO, |
10087 | + SUSPEND_NO_DIRECT_LOAD, |
10088 | + SUSPEND_LATE_CPU_HOTPLUG, |
10089 | +}; |
10090 | + |
10091 | +extern unsigned long suspend_action; |
10092 | + |
10093 | +#define clear_action_state(bit) (test_and_clear_bit(bit, &suspend_action)) |
10094 | +#define test_action_state(bit) (test_bit(bit, &suspend_action)) |
10095 | + |
10096 | +/* == Result states == */ |
10097 | + |
10098 | +enum { |
10099 | + SUSPEND_ABORTED, |
10100 | + SUSPEND_ABORT_REQUESTED, |
10101 | + SUSPEND_NOSTORAGE_AVAILABLE, |
10102 | + SUSPEND_INSUFFICIENT_STORAGE, |
10103 | + SUSPEND_FREEZING_FAILED, |
10104 | + SUSPEND_UNEXPECTED_ALLOC, |
10105 | + SUSPEND_KEPT_IMAGE, |
10106 | + SUSPEND_WOULD_EAT_MEMORY, |
10107 | + SUSPEND_UNABLE_TO_FREE_ENOUGH_MEMORY, |
10108 | + SUSPEND_ENCRYPTION_SETUP_FAILED, |
10109 | + SUSPEND_PM_SEM, |
10110 | + SUSPEND_DEVICE_REFUSED, |
10111 | + SUSPEND_EXTRA_PAGES_ALLOW_TOO_SMALL, |
10112 | + SUSPEND_UNABLE_TO_PREPARE_IMAGE, |
10113 | + SUSPEND_FAILED_MODULE_INIT, |
10114 | + SUSPEND_FAILED_MODULE_CLEANUP, |
10115 | + SUSPEND_FAILED_IO, |
10116 | + SUSPEND_OUT_OF_MEMORY, |
10117 | + SUSPEND_IMAGE_ERROR, |
10118 | + SUSPEND_PLATFORM_PREP_FAILED, |
10119 | + SUSPEND_CPU_HOTPLUG_FAILED, |
10120 | +}; |
10121 | + |
10122 | +extern unsigned long suspend_result; |
10123 | + |
10124 | +#define set_result_state(bit) (test_and_set_bit(bit, &suspend_result)) |
10125 | +#define clear_result_state(bit) (test_and_clear_bit(bit, &suspend_result)) |
10126 | +#define test_result_state(bit) (test_bit(bit, &suspend_result)) |
10127 | + |
10128 | +/* == Debug sections and levels == */ |
10129 | + |
10130 | +/* debugging levels. */ |
10131 | +enum { |
10132 | + SUSPEND_STATUS = 0, |
10133 | + SUSPEND_ERROR = 2, |
10134 | + SUSPEND_LOW, |
10135 | + SUSPEND_MEDIUM, |
10136 | + SUSPEND_HIGH, |
10137 | + SUSPEND_VERBOSE, |
10138 | +}; |
10139 | + |
10140 | +enum { |
10141 | + SUSPEND_ANY_SECTION, |
10142 | + SUSPEND_EAT_MEMORY, |
10143 | + SUSPEND_IO, |
10144 | + SUSPEND_HEADER, |
10145 | + SUSPEND_WRITER, |
10146 | + SUSPEND_MEMORY, |
10147 | +}; |
10148 | + |
10149 | +extern unsigned long suspend_debug_state; |
10150 | + |
10151 | +#define set_debug_state(bit) (test_and_set_bit(bit, &suspend_debug_state)) |
10152 | +#define clear_debug_state(bit) (test_and_clear_bit(bit, &suspend_debug_state)) |
10153 | +#define test_debug_state(bit) (test_bit(bit, &suspend_debug_state)) |
10154 | + |
10155 | +/* == Steps in suspending == */ |
10156 | + |
10157 | +enum { |
10158 | + STEP_SUSPEND_PREPARE_IMAGE, |
10159 | + STEP_SUSPEND_SAVE_IMAGE, |
10160 | + STEP_SUSPEND_POWERDOWN, |
10161 | + STEP_RESUME_CAN_RESUME, |
10162 | + STEP_RESUME_LOAD_PS1, |
10163 | + STEP_RESUME_DO_RESTORE, |
10164 | + STEP_RESUME_READ_PS2, |
10165 | + STEP_RESUME_GO, |
10166 | + STEP_RESUME_ALT_IMAGE, |
10167 | +}; |
10168 | + |
10169 | +/* == Suspend states == |
10170 | + (see also include/linux/suspend.h) */ |
10171 | + |
10172 | +#define get_suspend_state() (suspend_state) |
10173 | +#define restore_suspend_state(saved_state) \ |
10174 | + do { suspend_state = saved_state; } while(0) |
10175 | + |
10176 | +/* == Module support == */ |
10177 | + |
10178 | +struct suspend2_core_fns { |
10179 | + int (*post_context_save)(void); |
10180 | + unsigned long (*get_nonconflicting_page)(void); |
10181 | + int (*try_suspend)(int have_pmsem); |
10182 | + void (*try_resume)(void); |
10183 | +}; |
10184 | + |
10185 | +extern struct suspend2_core_fns *s2_core_fns; |
10186 | + |
10187 | +/* == All else == */ |
10188 | +#define KB(x) ((x) << (PAGE_SHIFT - 10)) |
10189 | +#define MB(x) ((x) >> (20 - PAGE_SHIFT)) |
10190 | + |
10191 | +extern int suspend_start_anything(int suspend_or_resume); |
10192 | +extern void suspend_finish_anything(int suspend_or_resume); |
10193 | + |
10194 | +extern int save_image_part1(void); |
10195 | +extern int suspend_atomic_restore(void); |
10196 | + |
10197 | +extern int _suspend2_try_suspend(int have_pmsem); |
10198 | +extern void __suspend2_try_resume(void); |
10199 | + |
10200 | +extern int __suspend_post_context_save(void); |
10201 | + |
10202 | +extern unsigned int nr_suspends; |
10203 | +extern char resume2_file[256]; |
10204 | +extern char poweroff_resume2[256]; |
10205 | + |
10206 | +extern void copyback_post(void); |
10207 | +extern int suspend2_suspend(void); |
10208 | +extern int extra_pd1_pages_used; |
10209 | + |
10210 | +extern int suspend_io_time[2][2]; |
10211 | + |
10212 | +#define SECTOR_SIZE 512 |
10213 | + |
10214 | +extern int suspend_early_boot_message |
10215 | + (int can_erase_image, int default_answer, char *warning_reason, ...); |
10216 | + |
10217 | +static inline int load_direct(struct page *page) |
10218 | +{ |
10219 | + return test_action_state(SUSPEND_NO_DIRECT_LOAD) ? 0 : PagePageset1Copy(page); |
10220 | +} |
10221 | + |
10222 | +extern int pre_resume_freeze(void); |
10223 | +#endif |
10224 | diff --git a/kernel/power/suspend2_builtin.c b/kernel/power/suspend2_builtin.c |
10225 | new file mode 100644 |
10226 | index 0000000..15fe301 |
10227 | --- /dev/null |
10228 | +++ b/kernel/power/suspend2_builtin.c |
10229 | @@ -0,0 +1,287 @@ |
10230 | +/* |
10231 | + * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
10232 | + * |
10233 | + * This file is released under the GPLv2. |
10234 | + */ |
10235 | +#include <linux/module.h> |
10236 | +#include <linux/resume-trace.h> |
10237 | +#include <linux/syscalls.h> |
10238 | +#include <linux/kernel.h> |
10239 | +#include <linux/swap.h> |
10240 | +#include <linux/syscalls.h> |
10241 | +#include <linux/bio.h> |
10242 | +#include <linux/root_dev.h> |
10243 | +#include <linux/freezer.h> |
10244 | +#include <linux/reboot.h> |
10245 | +#include <linux/writeback.h> |
10246 | +#include <linux/tty.h> |
10247 | +#include <linux/crypto.h> |
10248 | +#include <linux/cpu.h> |
10249 | +#include <linux/dyn_pageflags.h> |
10250 | +#include "io.h" |
10251 | +#include "suspend.h" |
10252 | +#include "extent.h" |
10253 | +#include "block_io.h" |
10254 | +#include "netlink.h" |
10255 | +#include "prepare_image.h" |
10256 | +#include "ui.h" |
10257 | +#include "sysfs.h" |
10258 | +#include "pagedir.h" |
10259 | +#include "modules.h" |
10260 | +#include "suspend2_builtin.h" |
10261 | + |
10262 | +#ifdef CONFIG_SUSPEND2_CORE_EXPORTS |
10263 | +#ifdef CONFIG_SOFTWARE_SUSPEND |
10264 | +EXPORT_SYMBOL_GPL(resume_file); |
10265 | +#endif |
10266 | + |
10267 | +EXPORT_SYMBOL_GPL(max_pfn); |
10268 | +EXPORT_SYMBOL_GPL(free_dyn_pageflags); |
10269 | +EXPORT_SYMBOL_GPL(clear_dynpageflag); |
10270 | +EXPORT_SYMBOL_GPL(test_dynpageflag); |
10271 | +EXPORT_SYMBOL_GPL(set_dynpageflag); |
10272 | +EXPORT_SYMBOL_GPL(get_next_bit_on); |
10273 | +EXPORT_SYMBOL_GPL(allocate_dyn_pageflags); |
10274 | +EXPORT_SYMBOL_GPL(clear_dyn_pageflags); |
10275 | + |
10276 | +#ifdef CONFIG_X86_64 |
10277 | +EXPORT_SYMBOL_GPL(restore_processor_state); |
10278 | +EXPORT_SYMBOL_GPL(save_processor_state); |
10279 | +#endif |
10280 | + |
10281 | +EXPORT_SYMBOL_GPL(kernel_shutdown_prepare); |
10282 | +EXPORT_SYMBOL_GPL(drop_pagecache); |
10283 | +EXPORT_SYMBOL_GPL(restore_pblist); |
10284 | +EXPORT_SYMBOL_GPL(pm_mutex); |
10285 | +EXPORT_SYMBOL_GPL(pm_restore_console); |
10286 | +EXPORT_SYMBOL_GPL(super_blocks); |
10287 | +EXPORT_SYMBOL_GPL(next_zone); |
10288 | + |
10289 | +EXPORT_SYMBOL_GPL(freeze_processes); |
10290 | +EXPORT_SYMBOL_GPL(thaw_processes); |
10291 | +EXPORT_SYMBOL_GPL(thaw_kernel_threads); |
10292 | +EXPORT_SYMBOL_GPL(shrink_all_memory); |
10293 | +EXPORT_SYMBOL_GPL(shrink_one_zone); |
10294 | +EXPORT_SYMBOL_GPL(saveable_page); |
10295 | +EXPORT_SYMBOL_GPL(swsusp_arch_suspend); |
10296 | +EXPORT_SYMBOL_GPL(swsusp_arch_resume); |
10297 | +EXPORT_SYMBOL_GPL(pm_ops); |
10298 | +EXPORT_SYMBOL_GPL(pm_prepare_console); |
10299 | +EXPORT_SYMBOL_GPL(follow_page); |
10300 | +EXPORT_SYMBOL_GPL(machine_halt); |
10301 | +EXPORT_SYMBOL_GPL(block_dump); |
10302 | +EXPORT_SYMBOL_GPL(unlink_lru_lists); |
10303 | +EXPORT_SYMBOL_GPL(relink_lru_lists); |
10304 | +EXPORT_SYMBOL_GPL(power_subsys); |
10305 | +EXPORT_SYMBOL_GPL(machine_power_off); |
10306 | +EXPORT_SYMBOL_GPL(suspend_enter); |
10307 | +EXPORT_SYMBOL_GPL(first_online_pgdat); |
10308 | +EXPORT_SYMBOL_GPL(next_online_pgdat); |
10309 | +EXPORT_SYMBOL_GPL(machine_restart); |
10310 | +EXPORT_SYMBOL_GPL(saved_command_line); |
10311 | +EXPORT_SYMBOL_GPL(tasklist_lock); |
10312 | +#ifdef CONFIG_SUSPEND_SMP |
10313 | +EXPORT_SYMBOL_GPL(disable_nonboot_cpus); |
10314 | +EXPORT_SYMBOL_GPL(enable_nonboot_cpus); |
10315 | +#endif |
10316 | +#endif |
10317 | + |
10318 | +#ifdef CONFIG_SUSPEND2_USERUI_EXPORTS |
10319 | +EXPORT_SYMBOL_GPL(kmsg_redirect); |
10320 | +EXPORT_SYMBOL_GPL(console_printk); |
10321 | +#ifndef CONFIG_COMPAT |
10322 | +EXPORT_SYMBOL_GPL(sys_ioctl); |
10323 | +#endif |
10324 | +#endif |
10325 | + |
10326 | +#ifdef CONFIG_SUSPEND2_SWAP_EXPORTS /* Suspend swap specific */ |
10327 | +EXPORT_SYMBOL_GPL(sys_swapon); |
10328 | +EXPORT_SYMBOL_GPL(sys_swapoff); |
10329 | +EXPORT_SYMBOL_GPL(si_swapinfo); |
10330 | +EXPORT_SYMBOL_GPL(map_swap_page); |
10331 | +EXPORT_SYMBOL_GPL(get_swap_page); |
10332 | +EXPORT_SYMBOL_GPL(swap_free); |
10333 | +EXPORT_SYMBOL_GPL(get_swap_info_struct); |
10334 | +#endif |
10335 | + |
10336 | +#ifdef CONFIG_SUSPEND2_FILE_EXPORTS |
10337 | +/* Suspend_file specific */ |
10338 | +extern char * __initdata root_device_name; |
10339 | + |
10340 | +EXPORT_SYMBOL_GPL(ROOT_DEV); |
10341 | +EXPORT_SYMBOL_GPL(root_device_name); |
10342 | +EXPORT_SYMBOL_GPL(sys_unlink); |
10343 | +EXPORT_SYMBOL_GPL(sys_mknod); |
10344 | +#endif |
10345 | + |
10346 | +/* Swap or file */ |
10347 | +#if defined(CONFIG_SUSPEND2_FILE_EXPORTS) || defined(CONFIG_SUSPEND2_SWAP_EXPORTS) |
10348 | +EXPORT_SYMBOL_GPL(bio_set_pages_dirty); |
10349 | +EXPORT_SYMBOL_GPL(name_to_dev_t); |
10350 | +#endif |
10351 | + |
10352 | +#if defined(CONFIG_SUSPEND2_EXPORTS) || defined(CONFIG_SUSPEND2_CORE_EXPORTS) |
10353 | +EXPORT_SYMBOL_GPL(snprintf_used); |
10354 | +#endif |
10355 | +struct suspend2_core_fns *s2_core_fns; |
10356 | +EXPORT_SYMBOL_GPL(s2_core_fns); |
10357 | + |
10358 | +dyn_pageflags_t pageset1_map; |
10359 | +dyn_pageflags_t pageset1_copy_map; |
10360 | +EXPORT_SYMBOL_GPL(pageset1_map); |
10361 | +EXPORT_SYMBOL_GPL(pageset1_copy_map); |
10362 | + |
10363 | +unsigned long suspend_result = 0; |
10364 | +unsigned long suspend_debug_state = 0; |
10365 | +int suspend_io_time[2][2]; |
10366 | +struct pagedir pagedir1 = {1}; |
10367 | + |
10368 | +EXPORT_SYMBOL_GPL(suspend_io_time); |
10369 | +EXPORT_SYMBOL_GPL(suspend_debug_state); |
10370 | +EXPORT_SYMBOL_GPL(suspend_result); |
10371 | +EXPORT_SYMBOL_GPL(pagedir1); |
10372 | + |
10373 | +unsigned long suspend_get_nonconflicting_page(void) |
10374 | +{ |
10375 | + return s2_core_fns->get_nonconflicting_page(); |
10376 | +} |
10377 | + |
10378 | +int suspend_post_context_save(void) |
10379 | +{ |
10380 | + return s2_core_fns->post_context_save(); |
10381 | +} |
10382 | + |
10383 | +int suspend2_try_suspend(int have_pmsem) |
10384 | +{ |
10385 | + if (!s2_core_fns) |
10386 | + return -ENODEV; |
10387 | + |
10388 | + return s2_core_fns->try_suspend(have_pmsem); |
10389 | +} |
10390 | + |
10391 | +void suspend2_try_resume(void) |
10392 | +{ |
10393 | + if (s2_core_fns) |
10394 | + s2_core_fns->try_resume(); |
10395 | +} |
10396 | + |
10397 | +int suspend2_lowlevel_builtin(void) |
10398 | +{ |
10399 | + int error = 0; |
10400 | + |
10401 | + save_processor_state(); |
10402 | + if ((error = swsusp_arch_suspend())) |
10403 | + printk(KERN_ERR "Error %d suspending\n", error); |
10404 | + /* Restore control flow appears here */ |
10405 | + restore_processor_state(); |
10406 | + |
10407 | + return error; |
10408 | +} |
10409 | + |
10410 | +EXPORT_SYMBOL_GPL(suspend2_lowlevel_builtin); |
10411 | + |
10412 | +unsigned long suspend_compress_bytes_in, suspend_compress_bytes_out; |
10413 | +EXPORT_SYMBOL_GPL(suspend_compress_bytes_in); |
10414 | +EXPORT_SYMBOL_GPL(suspend_compress_bytes_out); |
10415 | + |
10416 | +#ifdef CONFIG_SUSPEND2_REPLACE_SWSUSP |
10417 | +unsigned long suspend_action = (1 << SUSPEND_REPLACE_SWSUSP) | (1 << SUSPEND_PAGESET2_FULL); |
10418 | +#else |
10419 | +unsigned long suspend_action = 1 << SUSPEND_PAGESET2_FULL; |
10420 | +#endif |
10421 | +EXPORT_SYMBOL_GPL(suspend_action); |
10422 | + |
10423 | +unsigned long suspend_state = ((1 << SUSPEND_BOOT_TIME) | |
10424 | + (1 << SUSPEND_IGNORE_LOGLEVEL) | |
10425 | + (1 << SUSPEND_IO_STOPPED)); |
10426 | +EXPORT_SYMBOL_GPL(suspend_state); |
10427 | + |
10428 | +/* The number of suspends we have started (some may have been cancelled) */ |
10429 | +unsigned int nr_suspends; |
10430 | +EXPORT_SYMBOL_GPL(nr_suspends); |
10431 | + |
10432 | +char resume2_file[256] = CONFIG_SUSPEND2_DEFAULT_RESUME2; |
10433 | +EXPORT_SYMBOL_GPL(resume2_file); |
10434 | + |
10435 | +int suspend2_running = 0; |
10436 | +EXPORT_SYMBOL_GPL(suspend2_running); |
10437 | + |
10438 | +int suspend2_in_suspend __nosavedata; |
10439 | +EXPORT_SYMBOL_GPL(suspend2_in_suspend); |
10440 | + |
10441 | +unsigned long suspend2_nosave_state1 __nosavedata = 0; |
10442 | +unsigned long suspend2_nosave_state2 __nosavedata = 0; |
10443 | +int suspend2_nosave_state3 __nosavedata = 0; |
10444 | +int suspend2_nosave_io_speed[2][2] __nosavedata; |
10445 | +__nosavedata char suspend2_nosave_commandline[COMMAND_LINE_SIZE]; |
10446 | + |
10447 | +__nosavedata struct pbe *restore_highmem_pblist; |
10448 | + |
10449 | +#ifdef CONFIG_SUSPEND2_CORE_EXPORTS |
10450 | +#ifdef CONFIG_HIGHMEM |
10451 | +EXPORT_SYMBOL_GPL(nr_free_highpages); |
10452 | +EXPORT_SYMBOL_GPL(saveable_highmem_page); |
10453 | +EXPORT_SYMBOL_GPL(restore_highmem_pblist); |
10454 | +#endif |
10455 | + |
10456 | +EXPORT_SYMBOL_GPL(suspend2_nosave_state1); |
10457 | +EXPORT_SYMBOL_GPL(suspend2_nosave_state2); |
10458 | +EXPORT_SYMBOL_GPL(suspend2_nosave_state3); |
10459 | +EXPORT_SYMBOL_GPL(suspend2_nosave_io_speed); |
10460 | +EXPORT_SYMBOL_GPL(suspend2_nosave_commandline); |
10461 | +#endif |
10462 | + |
10463 | +/* -- Commandline Parameter Handling --- |
10464 | + * |
10465 | + * Resume setup: obtain the storage device. |
10466 | + */ |
10467 | +static int __init resume2_setup(char *str) |
10468 | +{ |
10469 | + if (!*str) |
10470 | + return 0; |
10471 | + |
10472 | + strncpy(resume2_file, str, 255); |
10473 | + return 0; |
10474 | +} |
10475 | + |
10476 | +/* |
10477 | + * Allow the user to specify that we should ignore any image found and |
10478 | + * invalidate the image if necesssary. This is equivalent to running |
10479 | + * the task queue and a sync and then turning off the power. The same |
10480 | + * precautions should be taken: fsck if you're not journalled. |
10481 | + */ |
10482 | +static int __init noresume2_setup(char *str) |
10483 | +{ |
10484 | + set_suspend_state(SUSPEND_NORESUME_SPECIFIED); |
10485 | + return 0; |
10486 | +} |
10487 | + |
10488 | +static int __init suspend_retry_resume_setup(char *str) |
10489 | +{ |
10490 | + set_suspend_state(SUSPEND_RETRY_RESUME); |
10491 | + return 0; |
10492 | +} |
10493 | + |
10494 | +#ifndef CONFIG_SOFTWARE_SUSPEND |
10495 | +static int __init resume_setup(char *str) |
10496 | +{ |
10497 | + if (!*str) |
10498 | + return 0; |
10499 | + |
10500 | + strncpy(resume2_file, str, 255); |
10501 | + return 0; |
10502 | +} |
10503 | + |
10504 | +static int __init noresume_setup(char *str) |
10505 | +{ |
10506 | + set_suspend_state(SUSPEND_NORESUME_SPECIFIED); |
10507 | + return 0; |
10508 | +} |
10509 | +__setup("noresume", noresume_setup); |
10510 | +__setup("resume=", resume_setup); |
10511 | +#endif |
10512 | + |
10513 | +__setup("noresume2", noresume2_setup); |
10514 | +__setup("resume2=", resume2_setup); |
10515 | +__setup("suspend_retry_resume", suspend_retry_resume_setup); |
10516 | + |
10517 | diff --git a/kernel/power/suspend2_builtin.h b/kernel/power/suspend2_builtin.h |
10518 | new file mode 100644 |
10519 | index 0000000..968b24b |
10520 | --- /dev/null |
10521 | +++ b/kernel/power/suspend2_builtin.h |
10522 | @@ -0,0 +1,35 @@ |
10523 | +/* |
10524 | + * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
10525 | + * |
10526 | + * This file is released under the GPLv2. |
10527 | + */ |
10528 | +#include <linux/dyn_pageflags.h> |
10529 | +#include <asm/setup.h> |
10530 | + |
10531 | +extern struct suspend2_core_fns *s2_core_fns; |
10532 | +extern unsigned long suspend_compress_bytes_in, suspend_compress_bytes_out; |
10533 | +extern unsigned long suspend_action; |
10534 | +extern unsigned int nr_suspends; |
10535 | +extern char resume2_file[256]; |
10536 | +extern int suspend2_in_suspend; |
10537 | + |
10538 | +extern unsigned long suspend2_nosave_state1 __nosavedata; |
10539 | +extern unsigned long suspend2_nosave_state2 __nosavedata; |
10540 | +extern int suspend2_nosave_state3 __nosavedata; |
10541 | +extern int suspend2_nosave_io_speed[2][2] __nosavedata; |
10542 | +extern __nosavedata char suspend2_nosave_commandline[COMMAND_LINE_SIZE]; |
10543 | +extern __nosavedata struct pbe *restore_highmem_pblist; |
10544 | + |
10545 | +int suspend2_lowlevel_builtin(void); |
10546 | + |
10547 | +extern dyn_pageflags_t __nosavedata suspend2_nosave_origmap; |
10548 | +extern dyn_pageflags_t __nosavedata suspend2_nosave_copymap; |
10549 | + |
10550 | +#ifdef CONFIG_HIGHMEM |
10551 | +extern __nosavedata struct zone_data *suspend2_nosave_zone_list; |
10552 | +extern __nosavedata unsigned long suspend2_nosave_max_pfn; |
10553 | +#endif |
10554 | + |
10555 | +extern unsigned long suspend_get_nonconflicting_page(void); |
10556 | +extern int suspend_post_context_save(void); |
10557 | +extern int suspend2_try_suspend(int have_pmsem); |
10558 | diff --git a/kernel/power/suspend_block_io.c b/kernel/power/suspend_block_io.c |
10559 | new file mode 100644 |
10560 | index 0000000..533ae5c |
10561 | --- /dev/null |
10562 | +++ b/kernel/power/suspend_block_io.c |
10563 | @@ -0,0 +1,1020 @@ |
10564 | +/* |
10565 | + * kernel/power/suspend_block_io.c |
10566 | + * |
10567 | + * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
10568 | + * |
10569 | + * Distributed under GPLv2. |
10570 | + * |
10571 | + * This file contains block io functions for suspend2. These are |
10572 | + * used by the swapwriter and it is planned that they will also |
10573 | + * be used by the NFSwriter. |
10574 | + * |
10575 | + */ |
10576 | + |
10577 | +#include <linux/blkdev.h> |
10578 | +#include <linux/syscalls.h> |
10579 | +#include <linux/suspend.h> |
10580 | + |
10581 | +#include "suspend.h" |
10582 | +#include "sysfs.h" |
10583 | +#include "modules.h" |
10584 | +#include "prepare_image.h" |
10585 | +#include "block_io.h" |
10586 | +#include "ui.h" |
10587 | + |
10588 | +static int pr_index; |
10589 | + |
10590 | +#if 0 |
10591 | +#define PR_DEBUG(a, b...) do { if (pr_index < 20) printk(a, ##b); } while(0) |
10592 | +#else |
10593 | +#define PR_DEBUG(a, b...) do { } while(0) |
10594 | +#endif |
10595 | + |
10596 | +#define MAX_OUTSTANDING_IO 2048 |
10597 | +#define SUBMIT_BATCH_SIZE 128 |
10598 | + |
10599 | +static int max_outstanding_io = MAX_OUTSTANDING_IO; |
10600 | +static int submit_batch_size = SUBMIT_BATCH_SIZE; |
10601 | + |
10602 | +struct io_info { |
10603 | + struct bio *sys_struct; |
10604 | + sector_t first_block; |
10605 | + struct page *bio_page, *dest_page; |
10606 | + int writing, readahead_index; |
10607 | + struct block_device *dev; |
10608 | + struct list_head list; |
10609 | +}; |
10610 | + |
10611 | +static LIST_HEAD(ioinfo_ready_for_cleanup); |
10612 | +static DEFINE_SPINLOCK(ioinfo_ready_lock); |
10613 | + |
10614 | +static LIST_HEAD(ioinfo_submit_batch); |
10615 | +static DEFINE_SPINLOCK(ioinfo_submit_lock); |
10616 | + |
10617 | +static LIST_HEAD(ioinfo_busy); |
10618 | +static DEFINE_SPINLOCK(ioinfo_busy_lock); |
10619 | + |
10620 | +static struct io_info *waiting_on; |
10621 | + |
10622 | +static atomic_t submit_batch; |
10623 | +static int submit_batched(void); |
10624 | + |
10625 | +/* [Max] number of I/O operations pending */ |
10626 | +static atomic_t outstanding_io; |
10627 | + |
10628 | +static int extra_page_forward = 0; |
10629 | + |
10630 | +static volatile unsigned long suspend_readahead_flags[ |
10631 | + DIV_ROUND_UP(MAX_OUTSTANDING_IO, BITS_PER_LONG)]; |
10632 | +static spinlock_t suspend_readahead_flags_lock = SPIN_LOCK_UNLOCKED; |
10633 | +static struct page *suspend_readahead_pages[MAX_OUTSTANDING_IO]; |
10634 | +static int readahead_index, readahead_submit_index; |
10635 | + |
10636 | +static int current_stream; |
10637 | +/* 0 = Header, 1 = Pageset1, 2 = Pageset2 */ |
10638 | +struct extent_iterate_saved_state suspend_writer_posn_save[3]; |
10639 | + |
10640 | +/* Pointer to current entry being loaded/saved. */ |
10641 | +struct extent_iterate_state suspend_writer_posn; |
10642 | + |
10643 | +/* Not static, so that the allocators can setup and complete |
10644 | + * writing the header */ |
10645 | +char *suspend_writer_buffer; |
10646 | +int suspend_writer_buffer_posn; |
10647 | + |
10648 | +int suspend_read_fd; |
10649 | + |
10650 | +static struct suspend_bdev_info *suspend_devinfo; |
10651 | + |
10652 | +int suspend_header_bytes_used = 0; |
10653 | + |
10654 | +DEFINE_MUTEX(suspend_bio_mutex); |
10655 | + |
10656 | +/* |
10657 | + * __suspend_bio_cleanup_one |
10658 | + * |
10659 | + * Description: Clean up after completing I/O on a page. |
10660 | + * Arguments: struct io_info: Data for I/O to be completed. |
10661 | + */ |
10662 | +static void __suspend_bio_cleanup_one(struct io_info *io_info) |
10663 | +{ |
10664 | + suspend_message(SUSPEND_WRITER, SUSPEND_HIGH, 0, |
10665 | + "Cleanup IO: [%p]\n", io_info); |
10666 | + |
10667 | + if (!io_info->writing && io_info->readahead_index == -1) { |
10668 | + char *from, *to; |
10669 | + /* |
10670 | + * Copy the page we read into the buffer our caller provided. |
10671 | + */ |
10672 | + to = (char *) kmap(io_info->dest_page); |
10673 | + from = (char *) kmap(io_info->bio_page); |
10674 | + memcpy(to, from, PAGE_SIZE); |
10675 | + kunmap(io_info->dest_page); |
10676 | + kunmap(io_info->bio_page); |
10677 | + } |
10678 | + |
10679 | + if (io_info->writing || io_info->readahead_index == -1) { |
10680 | + /* Sanity check */ |
10681 | + if (page_count(io_info->bio_page) != 2) |
10682 | + printk(KERN_EMERG "Cleanup IO: Page count on page %p" |
10683 | + " is %d. Not good!\n", |
10684 | + io_info->bio_page, |
10685 | + page_count(io_info->bio_page)); |
10686 | + put_page(io_info->bio_page); |
10687 | + __free_page(io_info->bio_page); |
10688 | + } else |
10689 | + put_page(io_info->bio_page); |
10690 | + |
10691 | + bio_put(io_info->sys_struct); |
10692 | + io_info->sys_struct = NULL; |
10693 | +} |
10694 | + |
10695 | +/* __suspend_io_cleanup |
10696 | + */ |
10697 | + |
10698 | +static void suspend_bio_cleanup_one(void *data) |
10699 | +{ |
10700 | + struct io_info *io_info = (struct io_info *) data; |
10701 | + int readahead_index; |
10702 | + unsigned long flags; |
10703 | + |
10704 | + readahead_index = io_info->readahead_index; |
10705 | + list_del_init(&io_info->list); |
10706 | + __suspend_bio_cleanup_one(io_info); |
10707 | + |
10708 | + if (readahead_index > -1) { |
10709 | + int index = readahead_index/BITS_PER_LONG; |
10710 | + int bit = readahead_index - (index * BITS_PER_LONG); |
10711 | + spin_lock_irqsave(&suspend_readahead_flags_lock, flags); |
10712 | + set_bit(bit, &suspend_readahead_flags[index]); |
10713 | + spin_unlock_irqrestore(&suspend_readahead_flags_lock, flags); |
10714 | + } |
10715 | + |
10716 | + if (waiting_on == io_info) |
10717 | + waiting_on = NULL; |
10718 | + kfree(io_info); |
10719 | + atomic_dec(&outstanding_io); |
10720 | +} |
10721 | + |
10722 | +/* suspend_cleanup_some_completed_io |
10723 | + * |
10724 | + * NB: This is designed so that multiple callers can be in here simultaneously. |
10725 | + */ |
10726 | + |
10727 | +static void suspend_cleanup_some_completed_io(void) |
10728 | +{ |
10729 | + int num_cleaned = 0; |
10730 | + struct io_info *first; |
10731 | + unsigned long flags; |
10732 | + |
10733 | + spin_lock_irqsave(&ioinfo_ready_lock, flags); |
10734 | + while(!list_empty(&ioinfo_ready_for_cleanup)) { |
10735 | + first = list_entry(ioinfo_ready_for_cleanup.next, |
10736 | + struct io_info, list); |
10737 | + |
10738 | + list_del_init(&first->list); |
10739 | + |
10740 | + spin_unlock_irqrestore(&ioinfo_ready_lock, flags); |
10741 | + suspend_bio_cleanup_one((void *) first); |
10742 | + spin_lock_irqsave(&ioinfo_ready_lock, flags); |
10743 | + |
10744 | + num_cleaned++; |
10745 | + if (num_cleaned == submit_batch_size) |
10746 | + break; |
10747 | + } |
10748 | + spin_unlock_irqrestore(&ioinfo_ready_lock, flags); |
10749 | +} |
10750 | + |
10751 | +/* do_bio_wait |
10752 | + * |
10753 | + * Actions taken when we want some I/O to get run. |
10754 | + * |
10755 | + * Submit any I/O that's batched up (if we're not already doing |
10756 | + * that, unplug queues, schedule and clean up whatever we can. |
10757 | + */ |
10758 | +static void do_bio_wait(void) |
10759 | +{ |
10760 | + int num_submitted = 0; |
10761 | + |
10762 | + /* Don't want to wait on I/O we haven't submitted! */ |
10763 | + num_submitted = submit_batched(); |
10764 | + |
10765 | + kblockd_flush(); |
10766 | + |
10767 | + io_schedule(); |
10768 | + |
10769 | + suspend_cleanup_some_completed_io(); |
10770 | +} |
10771 | + |
10772 | +/* |
10773 | + * suspend_finish_all_io |
10774 | + * |
10775 | + * Description: Finishes all IO and frees all IO info struct pages. |
10776 | + */ |
10777 | +static void suspend_finish_all_io(void) |
10778 | +{ |
10779 | + /* Wait for all I/O to complete. */ |
10780 | + while (atomic_read(&outstanding_io)) |
10781 | + do_bio_wait(); |
10782 | +} |
10783 | + |
10784 | +/* |
10785 | + * wait_on_readahead |
10786 | + * |
10787 | + * Wait until a particular readahead is ready. |
10788 | + */ |
10789 | +static void suspend_wait_on_readahead(int readahead_index) |
10790 | +{ |
10791 | + int index = readahead_index / BITS_PER_LONG; |
10792 | + int bit = readahead_index - index * BITS_PER_LONG; |
10793 | + |
10794 | + /* read_ahead_index is the one we want to return */ |
10795 | + while (!test_bit(bit, &suspend_readahead_flags[index])) |
10796 | + do_bio_wait(); |
10797 | +} |
10798 | + |
10799 | +/* |
10800 | + * readahead_done |
10801 | + * |
10802 | + * Returns whether the readahead requested is ready. |
10803 | + */ |
10804 | + |
10805 | +static int suspend_readahead_ready(int readahead_index) |
10806 | +{ |
10807 | + int index = readahead_index / BITS_PER_LONG; |
10808 | + int bit = readahead_index - (index * BITS_PER_LONG); |
10809 | + |
10810 | + return test_bit(bit, &suspend_readahead_flags[index]); |
10811 | +} |
10812 | + |
10813 | +/* suspend_readahead_prepare |
10814 | + * Set up for doing readahead on an image */ |
10815 | +static int suspend_prepare_readahead(int index) |
10816 | +{ |
10817 | + unsigned long new_page = get_zeroed_page(GFP_ATOMIC | __GFP_NOWARN); |
10818 | + |
10819 | + if(!new_page) |
10820 | + return -ENOMEM; |
10821 | + |
10822 | + suspend_readahead_pages[index] = virt_to_page(new_page); |
10823 | + return 0; |
10824 | +} |
10825 | + |
10826 | +/* suspend_readahead_cleanup |
10827 | + * Clean up structures used for readahead */ |
10828 | +static void suspend_cleanup_readahead(int page) |
10829 | +{ |
10830 | + __free_page(suspend_readahead_pages[page]); |
10831 | + suspend_readahead_pages[page] = 0; |
10832 | + return; |
10833 | +} |
10834 | + |
10835 | +/* |
10836 | + * suspend_end_bio |
10837 | + * |
10838 | + * Description: Function called by block driver from interrupt context when I/O |
10839 | + * is completed. This is the reason we use spinlocks in |
10840 | + * manipulating the io_info lists. |
10841 | + * Nearly the fs/buffer.c version, but we want to mark the page as |
10842 | + * done in our own structures too. |
10843 | + */ |
10844 | + |
10845 | +static int suspend_end_bio(struct bio *bio, unsigned int num, int err) |
10846 | +{ |
10847 | + struct io_info *io_info = bio->bi_private; |
10848 | + unsigned long flags; |
10849 | + |
10850 | + spin_lock_irqsave(&ioinfo_busy_lock, flags); |
10851 | + list_del_init(&io_info->list); |
10852 | + spin_unlock_irqrestore(&ioinfo_busy_lock, flags); |
10853 | + |
10854 | + spin_lock_irqsave(&ioinfo_ready_lock, flags); |
10855 | + list_add_tail(&io_info->list, &ioinfo_ready_for_cleanup); |
10856 | + spin_unlock_irqrestore(&ioinfo_ready_lock, flags); |
10857 | + return 0; |
10858 | +} |
10859 | + |
10860 | +/** |
10861 | + * submit - submit BIO request. |
10862 | + * @writing: READ or WRITE. |
10863 | + * @io_info: IO info structure. |
10864 | + * |
10865 | + * Based on Patrick's pmdisk code from long ago: |
10866 | + * "Straight from the textbook - allocate and initialize the bio. |
10867 | + * If we're writing, make sure the page is marked as dirty. |
10868 | + * Then submit it and carry on." |
10869 | + * |
10870 | + * With a twist, though - we handle block_size != PAGE_SIZE. |
10871 | + * Caller has already checked that our page is not fragmented. |
10872 | + */ |
10873 | + |
10874 | +static int submit(struct io_info *io_info) |
10875 | +{ |
10876 | + struct bio *bio = NULL; |
10877 | + unsigned long flags; |
10878 | + |
10879 | + while (!bio) { |
10880 | + bio = bio_alloc(GFP_ATOMIC,1); |
10881 | + if (!bio) |
10882 | + do_bio_wait(); |
10883 | + } |
10884 | + |
10885 | + bio->bi_bdev = io_info->dev; |
10886 | + bio->bi_sector = io_info->first_block; |
10887 | + bio->bi_private = io_info; |
10888 | + bio->bi_end_io = suspend_end_bio; |
10889 | + io_info->sys_struct = bio; |
10890 | + |
10891 | + if (bio_add_page(bio, io_info->bio_page, PAGE_SIZE, 0) < PAGE_SIZE) { |
10892 | + printk("ERROR: adding page to bio at %lld\n", |
10893 | + (unsigned long long) io_info->first_block); |
10894 | + bio_put(bio); |
10895 | + return -EFAULT; |
10896 | + } |
10897 | + |
10898 | + if (io_info->writing) |
10899 | + bio_set_pages_dirty(bio); |
10900 | + |
10901 | + spin_lock_irqsave(&ioinfo_busy_lock, flags); |
10902 | + list_add_tail(&io_info->list, &ioinfo_busy); |
10903 | + spin_unlock_irqrestore(&ioinfo_busy_lock, flags); |
10904 | + |
10905 | + submit_bio(io_info->writing, bio); |
10906 | + |
10907 | + return 0; |
10908 | +} |
10909 | + |
10910 | +/* |
10911 | + * submit a batch. The submit function can wait on I/O, so we have |
10912 | + * simple locking to avoid infinite recursion. |
10913 | + */ |
10914 | +static int submit_batched(void) |
10915 | +{ |
10916 | + static int running_already = 0; |
10917 | + struct io_info *first; |
10918 | + unsigned long flags; |
10919 | + int num_submitted = 0; |
10920 | + |
10921 | + if (running_already) |
10922 | + return 0; |
10923 | + |
10924 | + running_already = 1; |
10925 | + spin_lock_irqsave(&ioinfo_submit_lock, flags); |
10926 | + while(!list_empty(&ioinfo_submit_batch)) { |
10927 | + first = list_entry(ioinfo_submit_batch.next, struct io_info, |
10928 | + list); |
10929 | + list_del_init(&first->list); |
10930 | + atomic_dec(&submit_batch); |
10931 | + spin_unlock_irqrestore(&ioinfo_submit_lock, flags); |
10932 | + submit(first); |
10933 | + spin_lock_irqsave(&ioinfo_submit_lock, flags); |
10934 | + num_submitted++; |
10935 | + if (num_submitted == submit_batch_size) |
10936 | + break; |
10937 | + } |
10938 | + spin_unlock_irqrestore(&ioinfo_submit_lock, flags); |
10939 | + running_already = 0; |
10940 | + |
10941 | + return num_submitted; |
10942 | +} |
10943 | + |
10944 | +static void add_to_batch(struct io_info *io_info) |
10945 | +{ |
10946 | + unsigned long flags; |
10947 | + int waiting; |
10948 | + |
10949 | + /* Put our prepared I/O struct on the batch list. */ |
10950 | + spin_lock_irqsave(&ioinfo_submit_lock, flags); |
10951 | + list_add_tail(&io_info->list, &ioinfo_submit_batch); |
10952 | + waiting = atomic_add_return(1, &submit_batch); |
10953 | + spin_unlock_irqrestore(&ioinfo_submit_lock, flags); |
10954 | + |
10955 | + if (waiting >= submit_batch_size) |
10956 | + submit_batched(); |
10957 | +} |
10958 | + |
10959 | +/* |
10960 | + * get_io_info_struct |
10961 | + * |
10962 | + * Description: Get an I/O struct. |
10963 | + * Returns: Pointer to the struct prepared for use. |
10964 | + */ |
10965 | +static struct io_info *get_io_info_struct(void) |
10966 | +{ |
10967 | + struct io_info *this = NULL; |
10968 | + |
10969 | + do { |
10970 | + while (atomic_read(&outstanding_io) >= max_outstanding_io) |
10971 | + do_bio_wait(); |
10972 | + |
10973 | + this = kmalloc(sizeof(struct io_info), GFP_ATOMIC); |
10974 | + } while (!this); |
10975 | + |
10976 | + INIT_LIST_HEAD(&this->list); |
10977 | + return this; |
10978 | +} |
10979 | + |
10980 | +/* |
10981 | + * suspend_do_io |
10982 | + * |
10983 | + * Description: Prepare and start a read or write operation. |
10984 | + * Note that we use our own buffer for reading or writing. |
10985 | + * This simplifies doing readahead and asynchronous writing. |
10986 | + * We can begin a read without knowing the location into which |
10987 | + * the data will eventually be placed, and the buffer passed |
10988 | + * for a write can be reused immediately (essential for the |
10989 | + * modules system). |
10990 | + * Failure? What's that? |
10991 | + * Returns: The io_info struct created. |
10992 | + */ |
10993 | +static int suspend_do_io(int writing, struct block_device *bdev, long block0, |
10994 | + struct page *page, int readahead_index, int syncio) |
10995 | +{ |
10996 | + struct io_info *io_info; |
10997 | + unsigned long buffer_virt = 0; |
10998 | + char *to, *from; |
10999 | + |
11000 | + io_info = get_io_info_struct(); |
11001 | + |
11002 | + /* Done before submitting to avoid races. */ |
11003 | + if (syncio) |
11004 | + waiting_on = io_info; |
11005 | + |
11006 | + /* Get our local buffer */ |
11007 | + suspend_message(SUSPEND_WRITER, SUSPEND_HIGH, 1, |
11008 | + "Start_IO: [%p]", io_info); |
11009 | + |
11010 | + /* Copy settings to the io_info struct */ |
11011 | + io_info->writing = writing; |
11012 | + io_info->dev = bdev; |
11013 | + io_info->first_block = block0; |
11014 | + io_info->dest_page = page; |
11015 | + io_info->readahead_index = readahead_index; |
11016 | + |
11017 | + if (io_info->readahead_index == -1) { |
11018 | + while (!(buffer_virt = get_zeroed_page(GFP_ATOMIC | __GFP_NOWARN))) |
11019 | + do_bio_wait(); |
11020 | + |
11021 | + suspend_message(SUSPEND_WRITER, SUSPEND_HIGH, 0, |
11022 | + "[ALLOC BUFFER]->%d", |
11023 | + real_nr_free_pages(all_zones_mask)); |
11024 | + io_info->bio_page = virt_to_page(buffer_virt); |
11025 | + } else { |
11026 | + unsigned long flags; |
11027 | + int index = io_info->readahead_index / BITS_PER_LONG; |
11028 | + int bit = io_info->readahead_index - index * BITS_PER_LONG; |
11029 | + |
11030 | + spin_lock_irqsave(&suspend_readahead_flags_lock, flags); |
11031 | + clear_bit(bit, &suspend_readahead_flags[index]); |
11032 | + spin_unlock_irqrestore(&suspend_readahead_flags_lock, flags); |
11033 | + |
11034 | + io_info->bio_page = page; |
11035 | + } |
11036 | + |
11037 | + /* If writing, copy our data. The data is probably in |
11038 | + * lowmem, but we cannot be certain. If there is no |
11039 | + * compression/encryption, we might be passed the |
11040 | + * actual source page's address. */ |
11041 | + if (writing) { |
11042 | + to = (char *) buffer_virt; |
11043 | + from = kmap_atomic(page, KM_USER1); |
11044 | + memcpy(to, from, PAGE_SIZE); |
11045 | + kunmap_atomic(from, KM_USER1); |
11046 | + } |
11047 | + |
11048 | + /* Submit the page */ |
11049 | + get_page(io_info->bio_page); |
11050 | + |
11051 | + suspend_message(SUSPEND_WRITER, SUSPEND_HIGH, 1, |
11052 | + "-> (PRE BRW) %d\n", real_nr_free_pages(all_zones_mask)); |
11053 | + |
11054 | + if (syncio) |
11055 | + submit(io_info); |
11056 | + else |
11057 | + add_to_batch(io_info); |
11058 | + |
11059 | + atomic_inc(&outstanding_io); |
11060 | + |
11061 | + if (syncio) |
11062 | + do { do_bio_wait(); } while (waiting_on); |
11063 | + |
11064 | + return 0; |
11065 | +} |
11066 | + |
11067 | +/* We used to use bread here, but it doesn't correctly handle |
11068 | + * blocksize != PAGE_SIZE. Now we create a submit_info to get the data we |
11069 | + * want and use our normal routines (synchronously). |
11070 | + */ |
11071 | + |
11072 | +static int suspend_bdev_page_io(int writing, struct block_device *bdev, |
11073 | + long pos, struct page *page) |
11074 | +{ |
11075 | + return suspend_do_io(writing, bdev, pos, page, -1, 1); |
11076 | +} |
11077 | + |
11078 | +static int suspend_bio_memory_needed(void) |
11079 | +{ |
11080 | + /* We want to have at least enough memory so as to have |
11081 | + * max_outstanding_io transactions on the fly at once. If we |
11082 | + * can do more, fine. */ |
11083 | + return (max_outstanding_io * (PAGE_SIZE + sizeof(struct request) + |
11084 | + sizeof(struct bio) + sizeof(struct io_info))); |
11085 | +} |
11086 | + |
11087 | +static void suspend_set_devinfo(struct suspend_bdev_info *info) |
11088 | +{ |
11089 | + suspend_devinfo = info; |
11090 | +} |
11091 | + |
11092 | +static void dump_block_chains(void) |
11093 | +{ |
11094 | + int i; |
11095 | + |
11096 | + for (i = 0; i < suspend_writer_posn.num_chains; i++) { |
11097 | + struct extent *this; |
11098 | + |
11099 | + printk("Chain %d:", i); |
11100 | + |
11101 | + this = (suspend_writer_posn.chains + i)->first; |
11102 | + |
11103 | + if (!this) |
11104 | + printk(" (Empty)"); |
11105 | + |
11106 | + while (this) { |
11107 | + printk(" [%lu-%lu]%s", this->minimum, this->maximum, |
11108 | + this->next ? "," : ""); |
11109 | + this = this->next; |
11110 | + } |
11111 | + |
11112 | + printk("\n"); |
11113 | + } |
11114 | + |
11115 | + for (i = 0; i < 3; i++) |
11116 | + printk("Posn %d: Chain %d, extent %d, offset %lu.\n", i, |
11117 | + suspend_writer_posn_save[i].chain_num, |
11118 | + suspend_writer_posn_save[i].extent_num, |
11119 | + suspend_writer_posn_save[i].offset); |
11120 | +} |
11121 | +static int forward_extra_blocks(void) |
11122 | +{ |
11123 | + int i; |
11124 | + |
11125 | + for (i = 1; i < suspend_devinfo[suspend_writer_posn.current_chain]. |
11126 | + blocks_per_page; i++) |
11127 | + suspend_extent_state_next(&suspend_writer_posn); |
11128 | + |
11129 | + if (suspend_extent_state_eof(&suspend_writer_posn)) { |
11130 | + printk("Extent state eof.\n"); |
11131 | + dump_block_chains(); |
11132 | + return -ENODATA; |
11133 | + } |
11134 | + |
11135 | + return 0; |
11136 | +} |
11137 | + |
11138 | +static int forward_one_page(void) |
11139 | +{ |
11140 | + int at_start = (suspend_writer_posn.current_chain == -1); |
11141 | + |
11142 | + /* Have to go forward one to ensure we're on the right chain, |
11143 | + * before we can know how many more blocks to skip.*/ |
11144 | + suspend_extent_state_next(&suspend_writer_posn); |
11145 | + |
11146 | + if (!at_start && forward_extra_blocks()) |
11147 | + return -ENODATA; |
11148 | + |
11149 | + if (extra_page_forward) { |
11150 | + extra_page_forward = 0; |
11151 | + return forward_one_page(); |
11152 | + } |
11153 | + |
11154 | + return 0; |
11155 | +} |
11156 | + |
11157 | +/* Used in reading header, to jump to 2nd page after getting 1st page |
11158 | + * direct from image header. */ |
11159 | +static void set_extra_page_forward(void) |
11160 | +{ |
11161 | + extra_page_forward = 1; |
11162 | +} |
11163 | + |
11164 | +static int suspend_bio_rw_page(int writing, struct page *page, |
11165 | + int readahead_index, int sync) |
11166 | +{ |
11167 | + struct suspend_bdev_info *dev_info; |
11168 | + |
11169 | + if (test_action_state(SUSPEND_TEST_FILTER_SPEED)) |
11170 | + return 0; |
11171 | + |
11172 | + if (forward_one_page()) { |
11173 | + printk("Failed to advance a page in the extent data.\n"); |
11174 | + return -ENODATA; |
11175 | + } |
11176 | + |
11177 | + if (current_stream == 0 && writing && |
11178 | + suspend_writer_posn.current_chain == suspend_writer_posn_save[2].chain_num && |
11179 | + suspend_writer_posn.current_offset == suspend_writer_posn_save[2].offset) { |
11180 | + dump_block_chains(); |
11181 | + BUG(); |
11182 | + } |
11183 | + |
11184 | + dev_info = &suspend_devinfo[suspend_writer_posn.current_chain]; |
11185 | + |
11186 | + return suspend_do_io(writing, dev_info->bdev, |
11187 | + suspend_writer_posn.current_offset << |
11188 | + dev_info->bmap_shift, |
11189 | + page, readahead_index, sync); |
11190 | +} |
11191 | + |
11192 | +static int suspend_rw_init(int writing, int stream_number) |
11193 | +{ |
11194 | + suspend_header_bytes_used = 0; |
11195 | + |
11196 | + suspend_extent_state_restore(&suspend_writer_posn, |
11197 | + &suspend_writer_posn_save[stream_number]); |
11198 | + |
11199 | + suspend_writer_buffer_posn = writing ? 0 : PAGE_SIZE; |
11200 | + |
11201 | + current_stream = stream_number; |
11202 | + |
11203 | + readahead_index = readahead_submit_index = -1; |
11204 | + |
11205 | + pr_index = 0; |
11206 | + |
11207 | + return 0; |
11208 | +} |
11209 | + |
11210 | +static void suspend_read_header_init(void) |
11211 | +{ |
11212 | + readahead_index = readahead_submit_index = -1; |
11213 | +} |
11214 | + |
11215 | +static int suspend_rw_cleanup(int writing) |
11216 | +{ |
11217 | + if (writing && suspend_bio_rw_page(WRITE, |
11218 | + virt_to_page(suspend_writer_buffer), -1, 0)) |
11219 | + return -EIO; |
11220 | + |
11221 | + if (writing && current_stream == 2) |
11222 | + suspend_extent_state_save(&suspend_writer_posn, |
11223 | + &suspend_writer_posn_save[1]); |
11224 | + |
11225 | + suspend_finish_all_io(); |
11226 | + |
11227 | + if (!writing) |
11228 | + while (readahead_index != readahead_submit_index) { |
11229 | + suspend_cleanup_readahead(readahead_index); |
11230 | + readahead_index++; |
11231 | + if (readahead_index == max_outstanding_io) |
11232 | + readahead_index = 0; |
11233 | + } |
11234 | + |
11235 | + current_stream = 0; |
11236 | + |
11237 | + return 0; |
11238 | +} |
11239 | + |
11240 | +static int suspend_bio_read_page_with_readahead(void) |
11241 | +{ |
11242 | + static int last_result; |
11243 | + unsigned long *virt; |
11244 | + |
11245 | + if (readahead_index == -1) { |
11246 | + last_result = 0; |
11247 | + readahead_index = readahead_submit_index = 0; |
11248 | + } |
11249 | + |
11250 | + /* Start a new readahead? */ |
11251 | + if (last_result) { |
11252 | + /* We failed to submit a read, and have cleaned up |
11253 | + * all the readahead previously submitted */ |
11254 | + if (readahead_submit_index == readahead_index) { |
11255 | + abort_suspend(SUSPEND_FAILED_IO, "Failed to submit" |
11256 | + " a read and no readahead left.\n"); |
11257 | + return -EIO; |
11258 | + } |
11259 | + goto wait; |
11260 | + } |
11261 | + |
11262 | + do { |
11263 | + if (suspend_prepare_readahead(readahead_submit_index)) |
11264 | + break; |
11265 | + |
11266 | + last_result = suspend_bio_rw_page(READ, |
11267 | + suspend_readahead_pages[readahead_submit_index], |
11268 | + readahead_submit_index, SUSPEND_ASYNC); |
11269 | + if (last_result) { |
11270 | + printk("Begin read chunk for page %d returned %d.\n", |
11271 | + readahead_submit_index, last_result); |
11272 | + suspend_cleanup_readahead(readahead_submit_index); |
11273 | + break; |
11274 | + } |
11275 | + |
11276 | + readahead_submit_index++; |
11277 | + |
11278 | + if (readahead_submit_index == max_outstanding_io) |
11279 | + readahead_submit_index = 0; |
11280 | + |
11281 | + } while((!last_result) && (readahead_submit_index != readahead_index) && |
11282 | + (!suspend_readahead_ready(readahead_index))); |
11283 | + |
11284 | +wait: |
11285 | + suspend_wait_on_readahead(readahead_index); |
11286 | + |
11287 | + virt = kmap_atomic(suspend_readahead_pages[readahead_index], KM_USER1); |
11288 | + memcpy(suspend_writer_buffer, virt, PAGE_SIZE); |
11289 | + kunmap_atomic(virt, KM_USER1); |
11290 | + |
11291 | + suspend_cleanup_readahead(readahead_index); |
11292 | + |
11293 | + readahead_index++; |
11294 | + if (readahead_index == max_outstanding_io) |
11295 | + readahead_index = 0; |
11296 | + |
11297 | + return 0; |
11298 | +} |
11299 | + |
11300 | +/* |
11301 | + * |
11302 | + */ |
11303 | + |
11304 | +static int suspend_rw_buffer(int writing, char *buffer, int buffer_size) |
11305 | +{ |
11306 | + int bytes_left = buffer_size; |
11307 | + |
11308 | + /* Read/write a chunk of the header */ |
11309 | + while (bytes_left) { |
11310 | + char *source_start = buffer + buffer_size - bytes_left; |
11311 | + char *dest_start = suspend_writer_buffer + suspend_writer_buffer_posn; |
11312 | + int capacity = PAGE_SIZE - suspend_writer_buffer_posn; |
11313 | + char *to = writing ? dest_start : source_start; |
11314 | + char *from = writing ? source_start : dest_start; |
11315 | + |
11316 | + if (bytes_left <= capacity) { |
11317 | + if (test_debug_state(SUSPEND_HEADER)) |
11318 | + printk("Copy %d bytes %d-%d from %p to %p.\n", |
11319 | + bytes_left, |
11320 | + suspend_header_bytes_used, |
11321 | + suspend_header_bytes_used + bytes_left, |
11322 | + from, to); |
11323 | + memcpy(to, from, bytes_left); |
11324 | + suspend_writer_buffer_posn += bytes_left; |
11325 | + suspend_header_bytes_used += bytes_left; |
11326 | + return 0; |
11327 | + } |
11328 | + |
11329 | + /* Complete this page and start a new one */ |
11330 | + if (test_debug_state(SUSPEND_HEADER)) |
11331 | + printk("Copy %d bytes (%d-%d) from %p to %p.\n", |
11332 | + capacity, |
11333 | + suspend_header_bytes_used, |
11334 | + suspend_header_bytes_used + capacity, |
11335 | + from, to); |
11336 | + memcpy(to, from, capacity); |
11337 | + bytes_left -= capacity; |
11338 | + suspend_header_bytes_used += capacity; |
11339 | + |
11340 | + if (!writing) { |
11341 | + if (test_suspend_state(SUSPEND_TRY_RESUME_RD)) |
11342 | + sys_read(suspend_read_fd, |
11343 | + suspend_writer_buffer, BLOCK_SIZE); |
11344 | + else |
11345 | + if (suspend_bio_read_page_with_readahead()) |
11346 | + return -EIO; |
11347 | + } else if (suspend_bio_rw_page(WRITE, |
11348 | + virt_to_page(suspend_writer_buffer), |
11349 | + -1, SUSPEND_ASYNC)) |
11350 | + return -EIO; |
11351 | + |
11352 | + suspend_writer_buffer_posn = 0; |
11353 | + suspend_cond_pause(0, NULL); |
11354 | + } |
11355 | + |
11356 | + return 0; |
11357 | +} |
11358 | + |
11359 | +/* |
11360 | + * suspend_bio_read_chunk |
11361 | + * |
11362 | + * Read a (possibly compressed and/or encrypted) page from the image, |
11363 | + * into buffer_page, returning it's index and the buffer size. |
11364 | + * |
11365 | + * If asynchronous I/O is requested, use readahead. |
11366 | + */ |
11367 | + |
11368 | +static int suspend_bio_read_chunk(unsigned long *index, struct page *buffer_page, |
11369 | + unsigned int *buf_size, int sync) |
11370 | +{ |
11371 | + int result; |
11372 | + char *buffer_virt = kmap(buffer_page); |
11373 | + |
11374 | + pr_index++; |
11375 | + |
11376 | + while (!mutex_trylock(&suspend_bio_mutex)) |
11377 | + do_bio_wait(); |
11378 | + |
11379 | + if ((result = suspend_rw_buffer(READ, (char *) index, |
11380 | + sizeof(unsigned long)))) { |
11381 | + abort_suspend(SUSPEND_FAILED_IO, |
11382 | + "Read of index returned %d.\n", result); |
11383 | + goto out; |
11384 | + } |
11385 | + |
11386 | + if ((result = suspend_rw_buffer(READ, (char *) buf_size, sizeof(int)))) { |
11387 | + abort_suspend(SUSPEND_FAILED_IO, |
11388 | + "Read of buffer size is %d.\n", result); |
11389 | + goto out; |
11390 | + } |
11391 | + |
11392 | + result = suspend_rw_buffer(READ, buffer_virt, *buf_size); |
11393 | + if (result) |
11394 | + abort_suspend(SUSPEND_FAILED_IO, |
11395 | + "Read of data returned %d.\n", result); |
11396 | + |
11397 | + PR_DEBUG("%d: Index %ld, %d bytes.\n", pr_index, *index, *buf_size); |
11398 | +out: |
11399 | + mutex_unlock(&suspend_bio_mutex); |
11400 | + kunmap(buffer_page); |
11401 | + if (result) |
11402 | + abort_suspend(SUSPEND_FAILED_IO, |
11403 | + "Returning %d from suspend_bio_read_chunk.\n", result); |
11404 | + return result; |
11405 | +} |
11406 | + |
11407 | +/* |
11408 | + * suspend_bio_write_chunk |
11409 | + * |
11410 | + * Write a (possibly compressed and/or encrypted) page to the image from |
11411 | + * the buffer, together with it's index and buffer size. |
11412 | + */ |
11413 | + |
11414 | +static int suspend_bio_write_chunk(unsigned long index, struct page *buffer_page, |
11415 | + unsigned int buf_size) |
11416 | +{ |
11417 | + int result; |
11418 | + char *buffer_virt = kmap(buffer_page); |
11419 | + |
11420 | + pr_index++; |
11421 | + |
11422 | + while (!mutex_trylock(&suspend_bio_mutex)) |
11423 | + do_bio_wait(); |
11424 | + |
11425 | + if ((result = suspend_rw_buffer(WRITE, (char *) &index, |
11426 | + sizeof(unsigned long)))) |
11427 | + goto out; |
11428 | + |
11429 | + if ((result = suspend_rw_buffer(WRITE, (char *) &buf_size, sizeof(int)))) |
11430 | + goto out; |
11431 | + |
11432 | + result = suspend_rw_buffer(WRITE, buffer_virt, buf_size); |
11433 | + |
11434 | + PR_DEBUG("%d: Index %ld, %d bytes.\n", pr_index, index, buf_size); |
11435 | +out: |
11436 | + mutex_unlock(&suspend_bio_mutex); |
11437 | + kunmap(buffer_page); |
11438 | + return result; |
11439 | +} |
11440 | + |
11441 | +/* |
11442 | + * suspend_rw_header_chunk |
11443 | + * |
11444 | + * Read or write a portion of the header. |
11445 | + */ |
11446 | + |
11447 | +static int suspend_rw_header_chunk(int writing, |
11448 | + struct suspend_module_ops *owner, |
11449 | + char *buffer, int buffer_size) |
11450 | +{ |
11451 | + if (owner) { |
11452 | + owner->header_used += buffer_size; |
11453 | + if (owner->header_used > owner->header_requested) { |
11454 | + printk(KERN_EMERG "Suspend2 module %s is using more" |
11455 | + "header space (%u) than it requested (%u).\n", |
11456 | + owner->name, |
11457 | + owner->header_used, |
11458 | + owner->header_requested); |
11459 | + return buffer_size; |
11460 | + } |
11461 | + } |
11462 | + |
11463 | + return suspend_rw_buffer(writing, buffer, buffer_size); |
11464 | +} |
11465 | + |
11466 | +/* |
11467 | + * write_header_chunk_finish |
11468 | + * |
11469 | + * Flush any buffered writes in the section of the image. |
11470 | + */ |
11471 | +static int write_header_chunk_finish(void) |
11472 | +{ |
11473 | + return suspend_bio_rw_page(WRITE, virt_to_page(suspend_writer_buffer), |
11474 | + -1, 0) ? -EIO : 0; |
11475 | +} |
11476 | + |
11477 | +static int suspend_bio_storage_needed(void) |
11478 | +{ |
11479 | + return 2 * sizeof(int); |
11480 | +} |
11481 | + |
11482 | +static int suspend_bio_save_config_info(char *buf) |
11483 | +{ |
11484 | + int *ints = (int *) buf; |
11485 | + ints[0] = max_outstanding_io; |
11486 | + ints[1] = submit_batch_size; |
11487 | + return 2 * sizeof(int); |
11488 | +} |
11489 | + |
11490 | +static void suspend_bio_load_config_info(char *buf, int size) |
11491 | +{ |
11492 | + int *ints = (int *) buf; |
11493 | + max_outstanding_io = ints[0]; |
11494 | + submit_batch_size = ints[1]; |
11495 | +} |
11496 | + |
11497 | +static int suspend_bio_initialise(int starting_cycle) |
11498 | +{ |
11499 | + suspend_writer_buffer = (char *) get_zeroed_page(GFP_ATOMIC); |
11500 | + |
11501 | + return suspend_writer_buffer ? 0 : -ENOMEM; |
11502 | +} |
11503 | + |
11504 | +static void suspend_bio_cleanup(int finishing_cycle) |
11505 | +{ |
11506 | + if (suspend_writer_buffer) { |
11507 | + free_page((unsigned long) suspend_writer_buffer); |
11508 | + suspend_writer_buffer = NULL; |
11509 | + } |
11510 | +} |
11511 | + |
11512 | +struct suspend_bio_ops suspend_bio_ops = { |
11513 | + .bdev_page_io = suspend_bdev_page_io, |
11514 | + .finish_all_io = suspend_finish_all_io, |
11515 | + .forward_one_page = forward_one_page, |
11516 | + .set_extra_page_forward = set_extra_page_forward, |
11517 | + .set_devinfo = suspend_set_devinfo, |
11518 | + .read_chunk = suspend_bio_read_chunk, |
11519 | + .write_chunk = suspend_bio_write_chunk, |
11520 | + .rw_init = suspend_rw_init, |
11521 | + .rw_cleanup = suspend_rw_cleanup, |
11522 | + .read_header_init = suspend_read_header_init, |
11523 | + .rw_header_chunk = suspend_rw_header_chunk, |
11524 | + .write_header_chunk_finish = write_header_chunk_finish, |
11525 | +}; |
11526 | + |
11527 | +static struct suspend_sysfs_data sysfs_params[] = { |
11528 | + { SUSPEND2_ATTR("max_outstanding_io", SYSFS_RW), |
11529 | + SYSFS_INT(&max_outstanding_io, 16, MAX_OUTSTANDING_IO, 0), |
11530 | + }, |
11531 | + |
11532 | + { SUSPEND2_ATTR("submit_batch_size", SYSFS_RW), |
11533 | + SYSFS_INT(&submit_batch_size, 16, SUBMIT_BATCH_SIZE, 0), |
11534 | + } |
11535 | +}; |
11536 | + |
11537 | +static struct suspend_module_ops suspend_blockwriter_ops = |
11538 | +{ |
11539 | + .name = "Block I/O", |
11540 | + .type = MISC_MODULE, |
11541 | + .directory = "block_io", |
11542 | + .module = THIS_MODULE, |
11543 | + .memory_needed = suspend_bio_memory_needed, |
11544 | + .storage_needed = suspend_bio_storage_needed, |
11545 | + .save_config_info = suspend_bio_save_config_info, |
11546 | + .load_config_info = suspend_bio_load_config_info, |
11547 | + .initialise = suspend_bio_initialise, |
11548 | + .cleanup = suspend_bio_cleanup, |
11549 | + |
11550 | + .sysfs_data = sysfs_params, |
11551 | + .num_sysfs_entries = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data), |
11552 | +}; |
11553 | + |
11554 | +static __init int suspend_block_io_load(void) |
11555 | +{ |
11556 | + return suspend_register_module(&suspend_blockwriter_ops); |
11557 | +} |
11558 | + |
11559 | +#ifdef CONFIG_SUSPEND2_FILE_EXPORTS |
11560 | +EXPORT_SYMBOL_GPL(suspend_read_fd); |
11561 | +#endif |
11562 | +#if defined(CONFIG_SUSPEND2_FILE_EXPORTS) || defined(CONFIG_SUSPEND2_SWAP_EXPORTS) |
11563 | +EXPORT_SYMBOL_GPL(suspend_writer_posn); |
11564 | +EXPORT_SYMBOL_GPL(suspend_writer_posn_save); |
11565 | +EXPORT_SYMBOL_GPL(suspend_writer_buffer); |
11566 | +EXPORT_SYMBOL_GPL(suspend_writer_buffer_posn); |
11567 | +EXPORT_SYMBOL_GPL(suspend_header_bytes_used); |
11568 | +EXPORT_SYMBOL_GPL(suspend_bio_ops); |
11569 | +#endif |
11570 | +#ifdef MODULE |
11571 | +static __exit void suspend_block_io_unload(void) |
11572 | +{ |
11573 | + suspend_unregister_module(&suspend_blockwriter_ops); |
11574 | +} |
11575 | + |
11576 | +module_init(suspend_block_io_load); |
11577 | +module_exit(suspend_block_io_unload); |
11578 | +MODULE_LICENSE("GPL"); |
11579 | +MODULE_AUTHOR("Nigel Cunningham"); |
11580 | +MODULE_DESCRIPTION("Suspend2 block io functions"); |
11581 | +#else |
11582 | +late_initcall(suspend_block_io_load); |
11583 | +#endif |
11584 | diff --git a/kernel/power/suspend_compress.c b/kernel/power/suspend_compress.c |
11585 | new file mode 100644 |
11586 | index 0000000..6e70e33 |
11587 | --- /dev/null |
11588 | +++ b/kernel/power/suspend_compress.c |
11589 | @@ -0,0 +1,436 @@ |
11590 | +/* |
11591 | + * kernel/power/compression.c |
11592 | + * |
11593 | + * Copyright (C) 2003-2007 Nigel Cunningham (nigel at suspend2 net) |
11594 | + * |
11595 | + * This file is released under the GPLv2. |
11596 | + * |
11597 | + * This file contains data compression routines for suspend, |
11598 | + * using cryptoapi. |
11599 | + */ |
11600 | + |
11601 | +#include <linux/module.h> |
11602 | +#include <linux/suspend.h> |
11603 | +#include <linux/highmem.h> |
11604 | +#include <linux/vmalloc.h> |
11605 | +#include <linux/crypto.h> |
11606 | + |
11607 | +#include "suspend2_builtin.h" |
11608 | +#include "suspend.h" |
11609 | +#include "modules.h" |
11610 | +#include "sysfs.h" |
11611 | +#include "io.h" |
11612 | +#include "ui.h" |
11613 | + |
11614 | +static int suspend_expected_compression = 0; |
11615 | + |
11616 | +static struct suspend_module_ops suspend_compression_ops; |
11617 | +static struct suspend_module_ops *next_driver; |
11618 | + |
11619 | +static char suspend_compressor_name[32] = "lzf"; |
11620 | + |
11621 | +static DEFINE_MUTEX(stats_lock); |
11622 | + |
11623 | +struct cpu_context { |
11624 | + u8 * page_buffer; |
11625 | + struct crypto_comp *transform; |
11626 | + unsigned int len; |
11627 | + char *buffer_start; |
11628 | +}; |
11629 | + |
11630 | +static DEFINE_PER_CPU(struct cpu_context, contexts); |
11631 | + |
11632 | +static int suspend_compress_prepare_result; |
11633 | + |
11634 | +/* |
11635 | + * suspend_compress_cleanup |
11636 | + * |
11637 | + * Frees memory allocated for our labours. |
11638 | + */ |
11639 | +static void suspend_compress_cleanup(int suspend_or_resume) |
11640 | +{ |
11641 | + int cpu; |
11642 | + |
11643 | + if (!suspend_or_resume) |
11644 | + return; |
11645 | + |
11646 | + for_each_online_cpu(cpu) { |
11647 | + struct cpu_context *this = &per_cpu(contexts, cpu); |
11648 | + if (this->transform) { |
11649 | + crypto_free_comp(this->transform); |
11650 | + this->transform = NULL; |
11651 | + } |
11652 | + |
11653 | + if (this->page_buffer) |
11654 | + free_page((unsigned long) this->page_buffer); |
11655 | + |
11656 | + this->page_buffer = NULL; |
11657 | + } |
11658 | +} |
11659 | + |
11660 | +/* |
11661 | + * suspend_crypto_prepare |
11662 | + * |
11663 | + * Prepare to do some work by allocating buffers and transforms. |
11664 | + */ |
11665 | +static int suspend_compress_crypto_prepare(void) |
11666 | +{ |
11667 | + int cpu; |
11668 | + |
11669 | + if (!*suspend_compressor_name) { |
11670 | + printk("Suspend2: Compression enabled but no compressor name set.\n"); |
11671 | + return 1; |
11672 | + } |
11673 | + |
11674 | + for_each_online_cpu(cpu) { |
11675 | + struct cpu_context *this = &per_cpu(contexts, cpu); |
11676 | + this->transform = crypto_alloc_comp(suspend_compressor_name, |
11677 | + 0, 0); |
11678 | + if (IS_ERR(this->transform)) { |
11679 | + printk("Suspend2: Failed to initialise the %s " |
11680 | + "compression transform.\n", |
11681 | + suspend_compressor_name); |
11682 | + this->transform = NULL; |
11683 | + return 1; |
11684 | + } |
11685 | + |
11686 | + this->page_buffer = (char *) get_zeroed_page(GFP_ATOMIC); |
11687 | + |
11688 | + if (!this->page_buffer) { |
11689 | + printk(KERN_ERR |
11690 | + "Failed to allocate a page buffer for suspend2 " |
11691 | + "encryption driver.\n"); |
11692 | + return -ENOMEM; |
11693 | + } |
11694 | + } |
11695 | + |
11696 | + return 0; |
11697 | +} |
11698 | + |
11699 | +/* |
11700 | + * suspend_compress_init |
11701 | + */ |
11702 | + |
11703 | +static int suspend_compress_init(int suspend_or_resume) |
11704 | +{ |
11705 | + if (!suspend_or_resume) |
11706 | + return 0; |
11707 | + |
11708 | + suspend_compress_bytes_in = suspend_compress_bytes_out = 0; |
11709 | + |
11710 | + next_driver = suspend_get_next_filter(&suspend_compression_ops); |
11711 | + |
11712 | + if (!next_driver) { |
11713 | + printk("Compression Driver: Argh! Nothing follows me in" |
11714 | + " the pipeline!\n"); |
11715 | + return -ECHILD; |
11716 | + } |
11717 | + |
11718 | + suspend_compress_prepare_result = suspend_compress_crypto_prepare(); |
11719 | + |
11720 | + return 0; |
11721 | +} |
11722 | + |
11723 | +/* |
11724 | + * suspend_compress_rw_init() |
11725 | + */ |
11726 | + |
11727 | +int suspend_compress_rw_init(int rw, int stream_number) |
11728 | +{ |
11729 | + if (suspend_compress_prepare_result) { |
11730 | + printk("Failed to initialise compression algorithm.\n"); |
11731 | + if (rw == READ) |
11732 | + return -ENODEV; |
11733 | + else |
11734 | + suspend_compression_ops.enabled = 0; |
11735 | + } |
11736 | + |
11737 | + return 0; |
11738 | +} |
11739 | + |
11740 | +/* |
11741 | + * suspend_compress_write_chunk() |
11742 | + * |
11743 | + * Compress a page of data, buffering output and passing on filled |
11744 | + * pages to the next module in the pipeline. |
11745 | + * |
11746 | + * Buffer_page: Pointer to a buffer of size PAGE_SIZE, containing |
11747 | + * data to be compressed. |
11748 | + * |
11749 | + * Returns: 0 on success. Otherwise the error is that returned by later |
11750 | + * modules, -ECHILD if we have a broken pipeline or -EIO if |
11751 | + * zlib errs. |
11752 | + */ |
11753 | +static int suspend_compress_write_chunk(unsigned long index, |
11754 | + struct page *buffer_page, unsigned int buf_size) |
11755 | +{ |
11756 | + int ret, cpu = smp_processor_id(); |
11757 | + struct cpu_context *ctx = &per_cpu(contexts, cpu); |
11758 | + |
11759 | + if (!ctx->transform) |
11760 | + return next_driver->write_chunk(index, buffer_page, buf_size); |
11761 | + |
11762 | + ctx->buffer_start = kmap(buffer_page); |
11763 | + |
11764 | + ctx->len = buf_size; |
11765 | + |
11766 | + ret = crypto_comp_compress(ctx->transform, |
11767 | + ctx->buffer_start, buf_size, |
11768 | + ctx->page_buffer, &ctx->len); |
11769 | + |
11770 | + kunmap(buffer_page); |
11771 | + |
11772 | + if (ret) { |
11773 | + printk("Compression failed.\n"); |
11774 | + goto failure; |
11775 | + } |
11776 | + |
11777 | + mutex_lock(&stats_lock); |
11778 | + suspend_compress_bytes_in += buf_size; |
11779 | + suspend_compress_bytes_out += ctx->len; |
11780 | + mutex_unlock(&stats_lock); |
11781 | + |
11782 | + if (ctx->len < buf_size) /* some compression */ |
11783 | + ret = next_driver->write_chunk(index, |
11784 | + virt_to_page(ctx->page_buffer), |
11785 | + ctx->len); |
11786 | + else |
11787 | + ret = next_driver->write_chunk(index, buffer_page, buf_size); |
11788 | + |
11789 | +failure: |
11790 | + return ret; |
11791 | +} |
11792 | + |
11793 | +/* |
11794 | + * suspend_compress_read_chunk() |
11795 | + * @buffer_page: struct page *. Pointer to a buffer of size PAGE_SIZE. |
11796 | + * @sync: int. Whether the previous module (or core) wants its data |
11797 | + * synchronously. |
11798 | + * |
11799 | + * Retrieve data from later modules and decompress it until the input buffer |
11800 | + * is filled. |
11801 | + * Zero if successful. Error condition from me or from downstream on failure. |
11802 | + */ |
11803 | +static int suspend_compress_read_chunk(unsigned long *index, |
11804 | + struct page *buffer_page, unsigned int *buf_size, int sync) |
11805 | +{ |
11806 | + int ret, cpu = smp_processor_id(); |
11807 | + unsigned int len; |
11808 | + unsigned int outlen = PAGE_SIZE; |
11809 | + char *buffer_start; |
11810 | + struct cpu_context *ctx = &per_cpu(contexts, cpu); |
11811 | + |
11812 | + if (!ctx->transform) |
11813 | + return next_driver->read_chunk(index, buffer_page, buf_size, |
11814 | + sync); |
11815 | + |
11816 | + /* |
11817 | + * All our reads must be synchronous - we can't decompress |
11818 | + * data that hasn't been read yet. |
11819 | + */ |
11820 | + |
11821 | + *buf_size = PAGE_SIZE; |
11822 | + |
11823 | + ret = next_driver->read_chunk(index, buffer_page, &len, SUSPEND_SYNC); |
11824 | + |
11825 | + /* Error or uncompressed data */ |
11826 | + if (ret || len == PAGE_SIZE) |
11827 | + return ret; |
11828 | + |
11829 | + buffer_start = kmap(buffer_page); |
11830 | + memcpy(ctx->page_buffer, buffer_start, len); |
11831 | + ret = crypto_comp_decompress( |
11832 | + ctx->transform, |
11833 | + ctx->page_buffer, |
11834 | + len, buffer_start, &outlen); |
11835 | + if (ret) |
11836 | + abort_suspend(SUSPEND_FAILED_IO, |
11837 | + "Compress_read returned %d.\n", ret); |
11838 | + else if (outlen != PAGE_SIZE) { |
11839 | + abort_suspend(SUSPEND_FAILED_IO, |
11840 | + "Decompression yielded %d bytes instead of %ld.\n", |
11841 | + outlen, PAGE_SIZE); |
11842 | + ret = -EIO; |
11843 | + *buf_size = outlen; |
11844 | + } |
11845 | + kunmap(buffer_page); |
11846 | + return ret; |
11847 | +} |
11848 | + |
11849 | +/* |
11850 | + * suspend_compress_print_debug_stats |
11851 | + * @buffer: Pointer to a buffer into which the debug info will be printed. |
11852 | + * @size: Size of the buffer. |
11853 | + * |
11854 | + * Print information to be recorded for debugging purposes into a buffer. |
11855 | + * Returns: Number of characters written to the buffer. |
11856 | + */ |
11857 | + |
11858 | +static int suspend_compress_print_debug_stats(char *buffer, int size) |
11859 | +{ |
11860 | + int pages_in = suspend_compress_bytes_in >> PAGE_SHIFT, |
11861 | + pages_out = suspend_compress_bytes_out >> PAGE_SHIFT; |
11862 | + int len; |
11863 | + |
11864 | + /* Output the compression ratio achieved. */ |
11865 | + if (*suspend_compressor_name) |
11866 | + len = snprintf_used(buffer, size, "- Compressor is '%s'.\n", |
11867 | + suspend_compressor_name); |
11868 | + else |
11869 | + len = snprintf_used(buffer, size, "- Compressor is not set.\n"); |
11870 | + |
11871 | + if (pages_in) |
11872 | + len+= snprintf_used(buffer+len, size - len, |
11873 | + " Compressed %ld bytes into %ld (%d percent compression).\n", |
11874 | + suspend_compress_bytes_in, |
11875 | + suspend_compress_bytes_out, |
11876 | + (pages_in - pages_out) * 100 / pages_in); |
11877 | + return len; |
11878 | +} |
11879 | + |
11880 | +/* |
11881 | + * suspend_compress_compression_memory_needed |
11882 | + * |
11883 | + * Tell the caller how much memory we need to operate during suspend/resume. |
11884 | + * Returns: Unsigned long. Maximum number of bytes of memory required for |
11885 | + * operation. |
11886 | + */ |
11887 | +static int suspend_compress_memory_needed(void) |
11888 | +{ |
11889 | + return 2 * PAGE_SIZE; |
11890 | +} |
11891 | + |
11892 | +static int suspend_compress_storage_needed(void) |
11893 | +{ |
11894 | + return 4 * sizeof(unsigned long) + strlen(suspend_compressor_name) + 1; |
11895 | +} |
11896 | + |
11897 | +/* |
11898 | + * suspend_compress_save_config_info |
11899 | + * @buffer: Pointer to a buffer of size PAGE_SIZE. |
11900 | + * |
11901 | + * Save informaton needed when reloading the image at resume time. |
11902 | + * Returns: Number of bytes used for saving our data. |
11903 | + */ |
11904 | +static int suspend_compress_save_config_info(char *buffer) |
11905 | +{ |
11906 | + int namelen = strlen(suspend_compressor_name) + 1; |
11907 | + int total_len; |
11908 | + |
11909 | + *((unsigned long *) buffer) = suspend_compress_bytes_in; |
11910 | + *((unsigned long *) (buffer + 1 * sizeof(unsigned long))) = |
11911 | + suspend_compress_bytes_out; |
11912 | + *((unsigned long *) (buffer + 2 * sizeof(unsigned long))) = |
11913 | + suspend_expected_compression; |
11914 | + *((unsigned long *) (buffer + 3 * sizeof(unsigned long))) = namelen; |
11915 | + strncpy(buffer + 4 * sizeof(unsigned long), suspend_compressor_name, |
11916 | + namelen); |
11917 | + total_len = 4 * sizeof(unsigned long) + namelen; |
11918 | + return total_len; |
11919 | +} |
11920 | + |
11921 | +/* suspend_compress_load_config_info |
11922 | + * @buffer: Pointer to the start of the data. |
11923 | + * @size: Number of bytes that were saved. |
11924 | + * |
11925 | + * Description: Reload information needed for decompressing the image at |
11926 | + * resume time. |
11927 | + */ |
11928 | +static void suspend_compress_load_config_info(char *buffer, int size) |
11929 | +{ |
11930 | + int namelen; |
11931 | + |
11932 | + suspend_compress_bytes_in = *((unsigned long *) buffer); |
11933 | + suspend_compress_bytes_out = *((unsigned long *) (buffer + 1 * sizeof(unsigned long))); |
11934 | + suspend_expected_compression = *((unsigned long *) (buffer + 2 * |
11935 | + sizeof(unsigned long))); |
11936 | + namelen = *((unsigned long *) (buffer + 3 * sizeof(unsigned long))); |
11937 | + strncpy(suspend_compressor_name, buffer + 4 * sizeof(unsigned long), |
11938 | + namelen); |
11939 | + return; |
11940 | +} |
11941 | + |
11942 | +/* |
11943 | + * suspend_expected_compression_ratio |
11944 | + * |
11945 | + * Description: Returns the expected ratio between data passed into this module |
11946 | + * and the amount of data output when writing. |
11947 | + * Returns: 100 if the module is disabled. Otherwise the value set by the |
11948 | + * user via our sysfs entry. |
11949 | + */ |
11950 | + |
11951 | +static int suspend_compress_expected_ratio(void) |
11952 | +{ |
11953 | + if (!suspend_compression_ops.enabled) |
11954 | + return 100; |
11955 | + else |
11956 | + return 100 - suspend_expected_compression; |
11957 | +} |
11958 | + |
11959 | +/* |
11960 | + * data for our sysfs entries. |
11961 | + */ |
11962 | +static struct suspend_sysfs_data sysfs_params[] = { |
11963 | + { |
11964 | + SUSPEND2_ATTR("expected_compression", SYSFS_RW), |
11965 | + SYSFS_INT(&suspend_expected_compression, 0, 99, 0) |
11966 | + }, |
11967 | + |
11968 | + { |
11969 | + SUSPEND2_ATTR("enabled", SYSFS_RW), |
11970 | + SYSFS_INT(&suspend_compression_ops.enabled, 0, 1, 0) |
11971 | + }, |
11972 | + |
11973 | + { |
11974 | + SUSPEND2_ATTR("algorithm", SYSFS_RW), |
11975 | + SYSFS_STRING(suspend_compressor_name, 31, 0) |
11976 | + } |
11977 | +}; |
11978 | + |
11979 | +/* |
11980 | + * Ops structure. |
11981 | + */ |
11982 | +static struct suspend_module_ops suspend_compression_ops = { |
11983 | + .type = FILTER_MODULE, |
11984 | + .name = "Compressor", |
11985 | + .directory = "compression", |
11986 | + .module = THIS_MODULE, |
11987 | + .initialise = suspend_compress_init, |
11988 | + .cleanup = suspend_compress_cleanup, |
11989 | + .memory_needed = suspend_compress_memory_needed, |
11990 | + .print_debug_info = suspend_compress_print_debug_stats, |
11991 | + .save_config_info = suspend_compress_save_config_info, |
11992 | + .load_config_info = suspend_compress_load_config_info, |
11993 | + .storage_needed = suspend_compress_storage_needed, |
11994 | + .expected_compression = suspend_compress_expected_ratio, |
11995 | + |
11996 | + .rw_init = suspend_compress_rw_init, |
11997 | + |
11998 | + .write_chunk = suspend_compress_write_chunk, |
11999 | + .read_chunk = suspend_compress_read_chunk, |
12000 | + |
12001 | + .sysfs_data = sysfs_params, |
12002 | + .num_sysfs_entries = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data), |
12003 | +}; |
12004 | + |
12005 | +/* ---- Registration ---- */ |
12006 | + |
12007 | +static __init int suspend_compress_load(void) |
12008 | +{ |
12009 | + return suspend_register_module(&suspend_compression_ops); |
12010 | +} |
12011 | + |
12012 | +#ifdef MODULE |
12013 | +static __exit void suspend_compress_unload(void) |
12014 | +{ |
12015 | + suspend_unregister_module(&suspend_compression_ops); |
12016 | +} |
12017 | + |
12018 | +module_init(suspend_compress_load); |
12019 | +module_exit(suspend_compress_unload); |
12020 | +MODULE_LICENSE("GPL"); |
12021 | +MODULE_AUTHOR("Nigel Cunningham"); |
12022 | +MODULE_DESCRIPTION("Compression Support for Suspend2"); |
12023 | +#else |
12024 | +late_initcall(suspend_compress_load); |
12025 | +#endif |
12026 | diff --git a/kernel/power/suspend_file.c b/kernel/power/suspend_file.c |
12027 | new file mode 100644 |
12028 | index 0000000..e523f8b |
12029 | --- /dev/null |
12030 | +++ b/kernel/power/suspend_file.c |
12031 | @@ -0,0 +1,1131 @@ |
12032 | +/* |
12033 | + * kernel/power/suspend_file.c |
12034 | + * |
12035 | + * Copyright (C) 2005-2007 Nigel Cunningham (nigel at suspend2 net) |
12036 | + * |
12037 | + * Distributed under GPLv2. |
12038 | + * |
12039 | + * This file encapsulates functions for usage of a simple file as a |
12040 | + * backing store. It is based upon the swapallocator, and shares the |
12041 | + * same basic working. Here, though, we have nothing to do with |
12042 | + * swapspace, and only one device to worry about. |
12043 | + * |
12044 | + * The user can just |
12045 | + * |
12046 | + * echo Suspend2 > /path/to/my_file |
12047 | + * |
12048 | + * and |
12049 | + * |
12050 | + * echo /path/to/my_file > /sys/power/suspend2/suspend_file/target |
12051 | + * |
12052 | + * then put what they find in /sys/power/suspend2/resume2 |
12053 | + * as their resume2= parameter in lilo.conf (and rerun lilo if using it). |
12054 | + * |
12055 | + * Having done this, they're ready to suspend and resume. |
12056 | + * |
12057 | + * TODO: |
12058 | + * - File resizing. |
12059 | + */ |
12060 | + |
12061 | +#include <linux/suspend.h> |
12062 | +#include <linux/module.h> |
12063 | +#include <linux/blkdev.h> |
12064 | +#include <linux/file.h> |
12065 | +#include <linux/stat.h> |
12066 | +#include <linux/mount.h> |
12067 | +#include <linux/statfs.h> |
12068 | +#include <linux/syscalls.h> |
12069 | +#include <linux/namei.h> |
12070 | +#include <linux/fs.h> |
12071 | +#include <linux/root_dev.h> |
12072 | + |
12073 | +#include "suspend.h" |
12074 | +#include "sysfs.h" |
12075 | +#include "modules.h" |
12076 | +#include "ui.h" |
12077 | +#include "extent.h" |
12078 | +#include "io.h" |
12079 | +#include "storage.h" |
12080 | +#include "block_io.h" |
12081 | + |
12082 | +static struct suspend_module_ops suspend_fileops; |
12083 | + |
12084 | +/* Details of our target. */ |
12085 | + |
12086 | +char suspend_file_target[256]; |
12087 | +static struct inode *target_inode; |
12088 | +static struct file *target_file; |
12089 | +static struct block_device *suspend_file_target_bdev; |
12090 | +static dev_t resume_file_dev_t; |
12091 | +static int used_devt = 0; |
12092 | +static int setting_suspend_file_target = 0; |
12093 | +static sector_t target_firstblock = 0, target_header_start = 0; |
12094 | +static int target_storage_available = 0; |
12095 | +static int target_claim = 0; |
12096 | + |
12097 | +static char HaveImage[] = "HaveImage\n"; |
12098 | +static char NoImage[] = "Suspend2\n"; |
12099 | +#define sig_size (sizeof(HaveImage) + 1) |
12100 | + |
12101 | +struct suspend_file_header { |
12102 | + char sig[sig_size]; |
12103 | + int resumed_before; |
12104 | + unsigned long first_header_block; |
12105 | +}; |
12106 | + |
12107 | +extern char *__initdata root_device_name; |
12108 | + |
12109 | +/* Header Page Information */ |
12110 | +static int header_pages_allocated; |
12111 | + |
12112 | +/* Main Storage Pages */ |
12113 | +static int main_pages_allocated, main_pages_requested; |
12114 | + |
12115 | +#define target_is_normal_file() (S_ISREG(target_inode->i_mode)) |
12116 | + |
12117 | +static struct suspend_bdev_info devinfo; |
12118 | + |
12119 | +/* Extent chain for blocks */ |
12120 | +static struct extent_chain block_chain; |
12121 | + |
12122 | +/* Signature operations */ |
12123 | +enum { |
12124 | + GET_IMAGE_EXISTS, |
12125 | + INVALIDATE, |
12126 | + MARK_RESUME_ATTEMPTED, |
12127 | + UNMARK_RESUME_ATTEMPTED, |
12128 | +}; |
12129 | + |
12130 | +static void set_devinfo(struct block_device *bdev, int target_blkbits) |
12131 | +{ |
12132 | + devinfo.bdev = bdev; |
12133 | + if (!target_blkbits) { |
12134 | + devinfo.bmap_shift = devinfo.blocks_per_page = 0; |
12135 | + } else { |
12136 | + devinfo.bmap_shift = target_blkbits - 9; |
12137 | + devinfo.blocks_per_page = (1 << (PAGE_SHIFT - target_blkbits)); |
12138 | + } |
12139 | +} |
12140 | + |
12141 | +static int adjust_for_extra_pages(int unadjusted) |
12142 | +{ |
12143 | + return (unadjusted << PAGE_SHIFT) / (PAGE_SIZE + sizeof(unsigned long) |
12144 | + + sizeof(int)); |
12145 | +} |
12146 | + |
12147 | +static int suspend_file_storage_available(void) |
12148 | +{ |
12149 | + int result = 0; |
12150 | + struct block_device *bdev=suspend_file_target_bdev; |
12151 | + |
12152 | + if (!target_inode) |
12153 | + return 0; |
12154 | + |
12155 | + switch (target_inode->i_mode & S_IFMT) { |
12156 | + case S_IFSOCK: |
12157 | + case S_IFCHR: |
12158 | + case S_IFIFO: /* Socket, Char, Fifo */ |
12159 | + return -1; |
12160 | + case S_IFREG: /* Regular file: current size - holes + free |
12161 | + space on part */ |
12162 | + result = target_storage_available; |
12163 | + break; |
12164 | + case S_IFBLK: /* Block device */ |
12165 | + if (!bdev->bd_disk) { |
12166 | + printk("bdev->bd_disk null.\n"); |
12167 | + return 0; |
12168 | + } |
12169 | + |
12170 | + result = (bdev->bd_part ? |
12171 | + bdev->bd_part->nr_sects : |
12172 | + bdev->bd_disk->capacity) >> (PAGE_SHIFT - 9); |
12173 | + } |
12174 | + |
12175 | + return adjust_for_extra_pages(result); |
12176 | +} |
12177 | + |
12178 | +static int has_contiguous_blocks(int page_num) |
12179 | +{ |
12180 | + int j; |
12181 | + sector_t last = 0; |
12182 | + |
12183 | + for (j = 0; j < devinfo.blocks_per_page; j++) { |
12184 | + sector_t this = bmap(target_inode, |
12185 | + page_num * devinfo.blocks_per_page + j); |
12186 | + |
12187 | + if (!this || (last && (last + 1) != this)) |
12188 | + break; |
12189 | + |
12190 | + last = this; |
12191 | + } |
12192 | + |
12193 | + return (j == devinfo.blocks_per_page); |
12194 | +} |
12195 | + |
12196 | +static int size_ignoring_ignored_pages(void) |
12197 | +{ |
12198 | + int mappable = 0, i; |
12199 | + |
12200 | + if (!target_is_normal_file()) |
12201 | + return suspend_file_storage_available(); |
12202 | + |
12203 | + for (i = 0; i < (target_inode->i_size >> PAGE_SHIFT) ; i++) |
12204 | + if (has_contiguous_blocks(i)) |
12205 | + mappable++; |
12206 | + |
12207 | + return mappable; |
12208 | +} |
12209 | + |
12210 | +static void __populate_block_list(int min, int max) |
12211 | +{ |
12212 | + if (test_action_state(SUSPEND_TEST_BIO)) |
12213 | + printk("Adding extent %d-%d.\n", min << devinfo.bmap_shift, |
12214 | + ((max + 1) << devinfo.bmap_shift) - 1); |
12215 | + |
12216 | + suspend_add_to_extent_chain(&block_chain, min, max); |
12217 | +} |
12218 | + |
12219 | +static void populate_block_list(void) |
12220 | +{ |
12221 | + int i; |
12222 | + int extent_min = -1, extent_max = -1, got_header = 0; |
12223 | + |
12224 | + if (block_chain.first) |
12225 | + suspend_put_extent_chain(&block_chain); |
12226 | + |
12227 | + if (!target_is_normal_file()) { |
12228 | + if (target_storage_available > 0) |
12229 | + __populate_block_list(devinfo.blocks_per_page, |
12230 | + (target_storage_available + 1) * |
12231 | + devinfo.blocks_per_page - 1); |
12232 | + return; |
12233 | + } |
12234 | + |
12235 | + for (i = 0; i < (target_inode->i_size >> PAGE_SHIFT); i++) { |
12236 | + sector_t new_sector; |
12237 | + |
12238 | + if (!has_contiguous_blocks(i)) |
12239 | + continue; |
12240 | + |
12241 | + new_sector = bmap(target_inode, |
12242 | + (i * devinfo.blocks_per_page)); |
12243 | + |
12244 | + /* |
12245 | + * Ignore the first block in the file. |
12246 | + * It gets the header. |
12247 | + */ |
12248 | + if (new_sector == target_firstblock >> devinfo.bmap_shift) { |
12249 | + got_header = 1; |
12250 | + continue; |
12251 | + } |
12252 | + |
12253 | + /* |
12254 | + * I'd love to be able to fill in holes and resize |
12255 | + * files, but not yet... |
12256 | + */ |
12257 | + |
12258 | + if (new_sector == extent_max + 1) |
12259 | + extent_max+= devinfo.blocks_per_page; |
12260 | + else { |
12261 | + if (extent_min > -1) |
12262 | + __populate_block_list(extent_min, |
12263 | + extent_max); |
12264 | + |
12265 | + extent_min = new_sector; |
12266 | + extent_max = extent_min + |
12267 | + devinfo.blocks_per_page - 1; |
12268 | + } |
12269 | + } |
12270 | + |
12271 | + if (extent_min > -1) |
12272 | + __populate_block_list(extent_min, extent_max); |
12273 | +} |
12274 | + |
12275 | +static void suspend_file_cleanup(int finishing_cycle) |
12276 | +{ |
12277 | + if (suspend_file_target_bdev) { |
12278 | + if (target_claim) { |
12279 | + bd_release(suspend_file_target_bdev); |
12280 | + target_claim = 0; |
12281 | + } |
12282 | + |
12283 | + if (used_devt) { |
12284 | + blkdev_put(suspend_file_target_bdev); |
12285 | + used_devt = 0; |
12286 | + } |
12287 | + suspend_file_target_bdev = NULL; |
12288 | + target_inode = NULL; |
12289 | + set_devinfo(NULL, 0); |
12290 | + target_storage_available = 0; |
12291 | + } |
12292 | + |
12293 | + if (target_file > 0) { |
12294 | + filp_close(target_file, NULL); |
12295 | + target_file = NULL; |
12296 | + } |
12297 | +} |
12298 | + |
12299 | +/* |
12300 | + * reopen_resume_devt |
12301 | + * |
12302 | + * Having opened resume2= once, we remember the major and |
12303 | + * minor nodes and use them to reopen the bdev for checking |
12304 | + * whether an image exists (possibly when starting a resume). |
12305 | + */ |
12306 | +static void reopen_resume_devt(void) |
12307 | +{ |
12308 | + suspend_file_target_bdev = open_by_devnum(resume_file_dev_t, FMODE_READ); |
12309 | + if (IS_ERR(suspend_file_target_bdev)) { |
12310 | + printk("Got a dev_num (%lx) but failed to open it.\n", |
12311 | + (unsigned long) resume_file_dev_t); |
12312 | + return; |
12313 | + } |
12314 | + target_inode = suspend_file_target_bdev->bd_inode; |
12315 | + set_devinfo(suspend_file_target_bdev, target_inode->i_blkbits); |
12316 | +} |
12317 | + |
12318 | +static void suspend_file_get_target_info(char *target, int get_size, |
12319 | + int resume2) |
12320 | +{ |
12321 | + if (target_file) |
12322 | + suspend_file_cleanup(0); |
12323 | + |
12324 | + if (!target || !strlen(target)) |
12325 | + return; |
12326 | + |
12327 | + target_file = filp_open(target, O_RDWR, 0); |
12328 | + |
12329 | + if (IS_ERR(target_file) || !target_file) { |
12330 | + |
12331 | + if (!resume2) { |
12332 | + printk("Open file %s returned %p.\n", |
12333 | + target, target_file); |
12334 | + target_file = NULL; |
12335 | + return; |
12336 | + } |
12337 | + |
12338 | + target_file = NULL; |
12339 | + resume_file_dev_t = name_to_dev_t(target); |
12340 | + if (!resume_file_dev_t) { |
12341 | + struct kstat stat; |
12342 | + int error = vfs_stat(target, &stat); |
12343 | + printk("Open file %s returned %p and name_to_devt " |
12344 | + "failed.\n", target, target_file); |
12345 | + if (error) |
12346 | + printk("Stating the file also failed." |
12347 | + " Nothing more we can do.\n"); |
12348 | + else |
12349 | + resume_file_dev_t = stat.rdev; |
12350 | + return; |
12351 | + } |
12352 | + |
12353 | + suspend_file_target_bdev = open_by_devnum(resume_file_dev_t, |
12354 | + FMODE_READ); |
12355 | + if (IS_ERR(suspend_file_target_bdev)) { |
12356 | + printk("Got a dev_num (%lx) but failed to open it.\n", |
12357 | + (unsigned long) resume_file_dev_t); |
12358 | + return; |
12359 | + } |
12360 | + used_devt = 1; |
12361 | + target_inode = suspend_file_target_bdev->bd_inode; |
12362 | + } else |
12363 | + target_inode = target_file->f_mapping->host; |
12364 | + |
12365 | + if (S_ISLNK(target_inode->i_mode) || S_ISDIR(target_inode->i_mode) || |
12366 | + S_ISSOCK(target_inode->i_mode) || S_ISFIFO(target_inode->i_mode)) { |
12367 | + printk("File support works with regular files, character " |
12368 | + "files and block devices.\n"); |
12369 | + goto cleanup; |
12370 | + } |
12371 | + |
12372 | + if (!used_devt) { |
12373 | + if (S_ISBLK(target_inode->i_mode)) { |
12374 | + suspend_file_target_bdev = I_BDEV(target_inode); |
12375 | + if (!bd_claim(suspend_file_target_bdev, &suspend_fileops)) |
12376 | + target_claim = 1; |
12377 | + } else |
12378 | + suspend_file_target_bdev = target_inode->i_sb->s_bdev; |
12379 | + resume_file_dev_t = suspend_file_target_bdev->bd_dev; |
12380 | + } |
12381 | + |
12382 | + set_devinfo(suspend_file_target_bdev, target_inode->i_blkbits); |
12383 | + |
12384 | + if (get_size) |
12385 | + target_storage_available = size_ignoring_ignored_pages(); |
12386 | + |
12387 | + if (!resume2) |
12388 | + target_firstblock = bmap(target_inode, 0) << devinfo.bmap_shift; |
12389 | + |
12390 | + return; |
12391 | +cleanup: |
12392 | + target_inode = NULL; |
12393 | + if (target_file) { |
12394 | + filp_close(target_file, NULL); |
12395 | + target_file = NULL; |
12396 | + } |
12397 | + set_devinfo(NULL, 0); |
12398 | + target_storage_available = 0; |
12399 | +} |
12400 | + |
12401 | +static int parse_signature(struct suspend_file_header *header) |
12402 | +{ |
12403 | + int have_image = !memcmp(HaveImage, header->sig, sizeof(HaveImage) - 1); |
12404 | + int no_image_header = !memcmp(NoImage, header->sig, sizeof(NoImage) - 1); |
12405 | + |
12406 | + if (no_image_header) |
12407 | + return 0; |
12408 | + |
12409 | + if (!have_image) |
12410 | + return -1; |
12411 | + |
12412 | + if (header->resumed_before) |
12413 | + set_suspend_state(SUSPEND_RESUMED_BEFORE); |
12414 | + else |
12415 | + clear_suspend_state(SUSPEND_RESUMED_BEFORE); |
12416 | + |
12417 | + target_header_start = header->first_header_block; |
12418 | + return 1; |
12419 | +} |
12420 | + |
12421 | +/* prepare_signature */ |
12422 | + |
12423 | +static int prepare_signature(struct suspend_file_header *current_header, |
12424 | + unsigned long first_header_block) |
12425 | +{ |
12426 | + strncpy(current_header->sig, HaveImage, sizeof(HaveImage)); |
12427 | + current_header->resumed_before = 0; |
12428 | + current_header->first_header_block = first_header_block; |
12429 | + return 0; |
12430 | +} |
12431 | + |
12432 | +static int suspend_file_storage_allocated(void) |
12433 | +{ |
12434 | + if (!target_inode) |
12435 | + return 0; |
12436 | + |
12437 | + if (target_is_normal_file()) |
12438 | + return (int) target_storage_available; |
12439 | + else |
12440 | + return header_pages_allocated + main_pages_requested; |
12441 | +} |
12442 | + |
12443 | +static int suspend_file_release_storage(void) |
12444 | +{ |
12445 | + if (test_action_state(SUSPEND_KEEP_IMAGE) && |
12446 | + test_suspend_state(SUSPEND_NOW_RESUMING)) |
12447 | + return 0; |
12448 | + |
12449 | + suspend_put_extent_chain(&block_chain); |
12450 | + |
12451 | + header_pages_allocated = 0; |
12452 | + main_pages_allocated = 0; |
12453 | + main_pages_requested = 0; |
12454 | + return 0; |
12455 | +} |
12456 | + |
12457 | +static int __suspend_file_allocate_storage(int main_storage_requested, |
12458 | + int header_storage); |
12459 | + |
12460 | +static int suspend_file_allocate_header_space(int space_requested) |
12461 | +{ |
12462 | + int i; |
12463 | + |
12464 | + if (!block_chain.first && __suspend_file_allocate_storage( |
12465 | + main_pages_requested, space_requested)) { |
12466 | + printk("Failed to allocate space for the header.\n"); |
12467 | + return -ENOSPC; |
12468 | + } |
12469 | + |
12470 | + suspend_extent_state_goto_start(&suspend_writer_posn); |
12471 | + suspend_bio_ops.forward_one_page(); /* To first page */ |
12472 | + |
12473 | + for (i = 0; i < space_requested; i++) { |
12474 | + if (suspend_bio_ops.forward_one_page()) { |
12475 | + printk("Out of space while seeking to allocate " |
12476 | + "header pages,\n"); |
12477 | + header_pages_allocated = i; |
12478 | + return -ENOSPC; |
12479 | + } |
12480 | + } |
12481 | + |
12482 | + header_pages_allocated = space_requested; |
12483 | + |
12484 | + /* The end of header pages will be the start of pageset 2 */ |
12485 | + suspend_extent_state_save(&suspend_writer_posn, |
12486 | + &suspend_writer_posn_save[2]); |
12487 | + return 0; |
12488 | +} |
12489 | + |
12490 | +static int suspend_file_allocate_storage(int space_requested) |
12491 | +{ |
12492 | + if (__suspend_file_allocate_storage(space_requested, |
12493 | + header_pages_allocated)) |
12494 | + return -ENOSPC; |
12495 | + |
12496 | + main_pages_requested = space_requested; |
12497 | + return -ENOSPC; |
12498 | +} |
12499 | + |
12500 | +static int __suspend_file_allocate_storage(int main_space_requested, |
12501 | + int header_space_requested) |
12502 | +{ |
12503 | + int result = 0; |
12504 | + |
12505 | + int extra_pages = DIV_ROUND_UP(main_space_requested * |
12506 | + (sizeof(unsigned long) + sizeof(int)), PAGE_SIZE); |
12507 | + int pages_to_get = main_space_requested + extra_pages + |
12508 | + header_space_requested; |
12509 | + int blocks_to_get = pages_to_get - block_chain.size; |
12510 | + |
12511 | + /* Only release_storage reduces the size */ |
12512 | + if (blocks_to_get < 1) |
12513 | + return 0; |
12514 | + |
12515 | + populate_block_list(); |
12516 | + |
12517 | + suspend_message(SUSPEND_WRITER, SUSPEND_MEDIUM, 0, |
12518 | + "Finished with block_chain.size == %d.\n", |
12519 | + block_chain.size); |
12520 | + |
12521 | + if (block_chain.size < pages_to_get) { |
12522 | + printk("Block chain size (%d) < header pages (%d) + extra pages (%d) + main pages (%d) (=%d pages).\n", |
12523 | + block_chain.size, header_pages_allocated, extra_pages, |
12524 | + main_space_requested, pages_to_get); |
12525 | + result = -ENOSPC; |
12526 | + } |
12527 | + |
12528 | + main_pages_requested = main_space_requested; |
12529 | + main_pages_allocated = main_space_requested + extra_pages; |
12530 | + |
12531 | + suspend_file_allocate_header_space(header_pages_allocated); |
12532 | + return result; |
12533 | +} |
12534 | + |
12535 | +static int suspend_file_write_header_init(void) |
12536 | +{ |
12537 | + suspend_extent_state_goto_start(&suspend_writer_posn); |
12538 | + |
12539 | + suspend_writer_buffer_posn = suspend_header_bytes_used = 0; |
12540 | + |
12541 | + /* Info needed to bootstrap goes at the start of the header. |
12542 | + * First we save the basic info needed for reading, including the number |
12543 | + * of header pages. Then we save the structs containing data needed |
12544 | + * for reading the header pages back. |
12545 | + * Note that even if header pages take more than one page, when we |
12546 | + * read back the info, we will have restored the location of the |
12547 | + * next header page by the time we go to use it. |
12548 | + */ |
12549 | + |
12550 | + suspend_bio_ops.rw_header_chunk(WRITE, &suspend_fileops, |
12551 | + (char *) &suspend_writer_posn_save, |
12552 | + sizeof(suspend_writer_posn_save)); |
12553 | + |
12554 | + suspend_bio_ops.rw_header_chunk(WRITE, &suspend_fileops, |
12555 | + (char *) &devinfo, sizeof(devinfo)); |
12556 | + |
12557 | + suspend_serialise_extent_chain(&suspend_fileops, &block_chain); |
12558 | + |
12559 | + return 0; |
12560 | +} |
12561 | + |
12562 | +static int suspend_file_write_header_cleanup(void) |
12563 | +{ |
12564 | + struct suspend_file_header *header; |
12565 | + |
12566 | + /* Write any unsaved data */ |
12567 | + if (suspend_writer_buffer_posn) |
12568 | + suspend_bio_ops.write_header_chunk_finish(); |
12569 | + |
12570 | + suspend_bio_ops.finish_all_io(); |
12571 | + |
12572 | + suspend_extent_state_goto_start(&suspend_writer_posn); |
12573 | + suspend_bio_ops.forward_one_page(); |
12574 | + |
12575 | + /* Adjust image header */ |
12576 | + suspend_bio_ops.bdev_page_io(READ, suspend_file_target_bdev, |
12577 | + target_firstblock, |
12578 | + virt_to_page(suspend_writer_buffer)); |
12579 | + |
12580 | + header = (struct suspend_file_header *) suspend_writer_buffer; |
12581 | + |
12582 | + prepare_signature(header, |
12583 | + suspend_writer_posn.current_offset << |
12584 | + devinfo.bmap_shift); |
12585 | + |
12586 | + suspend_bio_ops.bdev_page_io(WRITE, suspend_file_target_bdev, |
12587 | + target_firstblock, |
12588 | + virt_to_page(suspend_writer_buffer)); |
12589 | + |
12590 | + suspend_bio_ops.finish_all_io(); |
12591 | + |
12592 | + return 0; |
12593 | +} |
12594 | + |
12595 | +/* HEADER READING */ |
12596 | + |
12597 | +#ifdef CONFIG_DEVFS_FS |
12598 | +int create_dev(char *name, dev_t dev, char *devfs_name); |
12599 | +#else |
12600 | +static int create_dev(char *name, dev_t dev, char *devfs_name) |
12601 | +{ |
12602 | + sys_unlink(name); |
12603 | + return sys_mknod(name, S_IFBLK|0600, new_encode_dev(dev)); |
12604 | +} |
12605 | +#endif |
12606 | + |
12607 | +static int rd_init(void) |
12608 | +{ |
12609 | + suspend_writer_buffer_posn = 0; |
12610 | + |
12611 | + create_dev("/dev/root", ROOT_DEV, root_device_name); |
12612 | + create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, 0), NULL); |
12613 | + |
12614 | + suspend_read_fd = sys_open("/dev/root", O_RDONLY, 0); |
12615 | + if (suspend_read_fd < 0) |
12616 | + goto out; |
12617 | + |
12618 | + sys_read(suspend_read_fd, suspend_writer_buffer, BLOCK_SIZE); |
12619 | + |
12620 | + memcpy(&suspend_writer_posn_save, |
12621 | + suspend_writer_buffer + suspend_writer_buffer_posn, |
12622 | + sizeof(suspend_writer_posn_save)); |
12623 | + |
12624 | + suspend_writer_buffer_posn += sizeof(suspend_writer_posn_save); |
12625 | + |
12626 | + return 0; |
12627 | +out: |
12628 | + sys_unlink("/dev/ram"); |
12629 | + sys_unlink("/dev/root"); |
12630 | + return -EIO; |
12631 | +} |
12632 | + |
12633 | +static int file_init(void) |
12634 | +{ |
12635 | + suspend_writer_buffer_posn = 0; |
12636 | + |
12637 | + /* Read suspend_file configuration */ |
12638 | + suspend_bio_ops.bdev_page_io(READ, suspend_file_target_bdev, |
12639 | + target_header_start, |
12640 | + virt_to_page((unsigned long) suspend_writer_buffer)); |
12641 | + |
12642 | + return 0; |
12643 | +} |
12644 | + |
12645 | +/* |
12646 | + * read_header_init() |
12647 | + * |
12648 | + * Ramdisk support based heavily on init/do_mounts_rd.c |
12649 | + * |
12650 | + * Description: |
12651 | + * 1. Attempt to read the device specified with resume2=. |
12652 | + * 2. Check the contents of the header for our signature. |
12653 | + * 3. Warn, ignore, reset and/or continue as appropriate. |
12654 | + * 4. If continuing, read the suspend_file configuration section |
12655 | + * of the header and set up block device info so we can read |
12656 | + * the rest of the header & image. |
12657 | + * |
12658 | + * Returns: |
12659 | + * May not return if user choose to reboot at a warning. |
12660 | + * -EINVAL if cannot resume at this time. Booting should continue |
12661 | + * normally. |
12662 | + */ |
12663 | + |
12664 | +static int suspend_file_read_header_init(void) |
12665 | +{ |
12666 | + int result; |
12667 | + struct block_device *tmp; |
12668 | + |
12669 | + if (test_suspend_state(SUSPEND_TRY_RESUME_RD)) |
12670 | + result = rd_init(); |
12671 | + else |
12672 | + result = file_init(); |
12673 | + |
12674 | + if (result) { |
12675 | + printk("FileAllocator read header init: Failed to initialise " |
12676 | + "reading the first page of data.\n"); |
12677 | + return result; |
12678 | + } |
12679 | + |
12680 | + memcpy(&suspend_writer_posn_save, |
12681 | + suspend_writer_buffer + suspend_writer_buffer_posn, |
12682 | + sizeof(suspend_writer_posn_save)); |
12683 | + |
12684 | + suspend_writer_buffer_posn += sizeof(suspend_writer_posn_save); |
12685 | + |
12686 | + tmp = devinfo.bdev; |
12687 | + |
12688 | + memcpy(&devinfo, |
12689 | + suspend_writer_buffer + suspend_writer_buffer_posn, |
12690 | + sizeof(devinfo)); |
12691 | + |
12692 | + devinfo.bdev = tmp; |
12693 | + suspend_writer_buffer_posn += sizeof(devinfo); |
12694 | + |
12695 | + suspend_bio_ops.read_header_init(); |
12696 | + suspend_extent_state_goto_start(&suspend_writer_posn); |
12697 | + suspend_bio_ops.set_extra_page_forward(); |
12698 | + |
12699 | + suspend_header_bytes_used = suspend_writer_buffer_posn; |
12700 | + |
12701 | + return suspend_load_extent_chain(&block_chain); |
12702 | +} |
12703 | + |
12704 | +static int suspend_file_read_header_cleanup(void) |
12705 | +{ |
12706 | + suspend_bio_ops.rw_cleanup(READ); |
12707 | + return 0; |
12708 | +} |
12709 | + |
12710 | +static int suspend_file_signature_op(int op) |
12711 | +{ |
12712 | + char *cur; |
12713 | + int result = 0, changed = 0; |
12714 | + struct suspend_file_header *header; |
12715 | + |
12716 | + if(suspend_file_target_bdev <= 0) |
12717 | + return -1; |
12718 | + |
12719 | + cur = (char *) get_zeroed_page(GFP_ATOMIC); |
12720 | + if (!cur) { |
12721 | + printk("Unable to allocate a page for reading the image " |
12722 | + "signature.\n"); |
12723 | + return -ENOMEM; |
12724 | + } |
12725 | + |
12726 | + suspend_bio_ops.bdev_page_io(READ, suspend_file_target_bdev, |
12727 | + target_firstblock, |
12728 | + virt_to_page(cur)); |
12729 | + |
12730 | + header = (struct suspend_file_header *) cur; |
12731 | + result = parse_signature(header); |
12732 | + |
12733 | + switch (op) { |
12734 | + case INVALIDATE: |
12735 | + if (result == -1) |
12736 | + goto out; |
12737 | + |
12738 | + strcpy(header->sig, NoImage); |
12739 | + header->resumed_before = 0; |
12740 | + result = changed = 1; |
12741 | + break; |
12742 | + case MARK_RESUME_ATTEMPTED: |
12743 | + if (result == 1) { |
12744 | + header->resumed_before = 1; |
12745 | + changed = 1; |
12746 | + } |
12747 | + break; |
12748 | + case UNMARK_RESUME_ATTEMPTED: |
12749 | + if (result == 1) { |
12750 | + header->resumed_before = 0; |
12751 | + changed = 1; |
12752 | + } |
12753 | + break; |
12754 | + } |
12755 | + |
12756 | + if (changed) |
12757 | + suspend_bio_ops.bdev_page_io(WRITE, suspend_file_target_bdev, |
12758 | + target_firstblock, |
12759 | + virt_to_page(cur)); |
12760 | + |
12761 | +out: |
12762 | + suspend_bio_ops.finish_all_io(); |
12763 | + free_page((unsigned long) cur); |
12764 | + return result; |
12765 | +} |
12766 | + |
12767 | +/* Print debug info |
12768 | + * |
12769 | + * Description: |
12770 | + */ |
12771 | + |
12772 | +static int suspend_file_print_debug_stats(char *buffer, int size) |
12773 | +{ |
12774 | + int len = 0; |
12775 | + |
12776 | + if (suspendActiveAllocator != &suspend_fileops) { |
12777 | + len = snprintf_used(buffer, size, "- FileAllocator inactive.\n"); |
12778 | + return len; |
12779 | + } |
12780 | + |
12781 | + len = snprintf_used(buffer, size, "- FileAllocator active.\n"); |
12782 | + |
12783 | + len+= snprintf_used(buffer+len, size-len, " Storage available for image: " |
12784 | + "%ld pages.\n", |
12785 | + suspend_file_storage_allocated()); |
12786 | + |
12787 | + return len; |
12788 | +} |
12789 | + |
12790 | +/* |
12791 | + * Storage needed |
12792 | + * |
12793 | + * Returns amount of space in the image header required |
12794 | + * for the suspend_file's data. |
12795 | + * |
12796 | + * We ensure the space is allocated, but actually save the |
12797 | + * data from write_header_init and therefore don't also define a |
12798 | + * save_config_info routine. |
12799 | + */ |
12800 | +static int suspend_file_storage_needed(void) |
12801 | +{ |
12802 | + return sig_size + strlen(suspend_file_target) + 1 + |
12803 | + 3 * sizeof(struct extent_iterate_saved_state) + |
12804 | + sizeof(devinfo) + |
12805 | + sizeof(struct extent_chain) - 2 * sizeof(void *) + |
12806 | + (2 * sizeof(unsigned long) * block_chain.num_extents); |
12807 | +} |
12808 | + |
12809 | +/* |
12810 | + * suspend_file_invalidate_image |
12811 | + * |
12812 | + */ |
12813 | +static int suspend_file_invalidate_image(void) |
12814 | +{ |
12815 | + int result; |
12816 | + |
12817 | + suspend_file_release_storage(); |
12818 | + |
12819 | + result = suspend_file_signature_op(INVALIDATE); |
12820 | + if (result == 1 && !nr_suspends) |
12821 | + printk(KERN_WARNING "Suspend2: Image invalidated.\n"); |
12822 | + |
12823 | + return result; |
12824 | +} |
12825 | + |
12826 | +/* |
12827 | + * Image_exists |
12828 | + * |
12829 | + */ |
12830 | + |
12831 | +static int suspend_file_image_exists(void) |
12832 | +{ |
12833 | + if (!suspend_file_target_bdev) |
12834 | + reopen_resume_devt(); |
12835 | + |
12836 | + return suspend_file_signature_op(GET_IMAGE_EXISTS); |
12837 | +} |
12838 | + |
12839 | +/* |
12840 | + * Mark resume attempted. |
12841 | + * |
12842 | + * Record that we tried to resume from this image. |
12843 | + */ |
12844 | + |
12845 | +static void suspend_file_mark_resume_attempted(int mark) |
12846 | +{ |
12847 | + suspend_file_signature_op(mark ? MARK_RESUME_ATTEMPTED: |
12848 | + UNMARK_RESUME_ATTEMPTED); |
12849 | +} |
12850 | + |
12851 | +static void suspend_file_set_resume2(void) |
12852 | +{ |
12853 | + char *buffer = (char *) get_zeroed_page(GFP_ATOMIC); |
12854 | + char *buffer2 = (char *) get_zeroed_page(GFP_ATOMIC); |
12855 | + unsigned long sector = bmap(target_inode, 0); |
12856 | + int offset = 0; |
12857 | + |
12858 | + if (suspend_file_target_bdev) { |
12859 | + set_devinfo(suspend_file_target_bdev, target_inode->i_blkbits); |
12860 | + |
12861 | + bdevname(suspend_file_target_bdev, buffer2); |
12862 | + offset += snprintf(buffer + offset, PAGE_SIZE - offset, |
12863 | + "/dev/%s", buffer2); |
12864 | + |
12865 | + if (sector) |
12866 | + offset += snprintf(buffer + offset, PAGE_SIZE - offset, |
12867 | + ":0x%lx", sector << devinfo.bmap_shift); |
12868 | + } else |
12869 | + offset += snprintf(buffer + offset, PAGE_SIZE - offset, |
12870 | + "%s is not a valid target.", suspend_file_target); |
12871 | + |
12872 | + sprintf(resume2_file, "file:%s", buffer); |
12873 | + |
12874 | + free_page((unsigned long) buffer); |
12875 | + free_page((unsigned long) buffer2); |
12876 | + |
12877 | + suspend_attempt_to_parse_resume_device(1); |
12878 | +} |
12879 | + |
12880 | +static int __test_suspend_file_target(char *target, int resume_time, int quiet) |
12881 | +{ |
12882 | + suspend_file_get_target_info(target, 0, resume_time); |
12883 | + if (suspend_file_signature_op(GET_IMAGE_EXISTS) > -1) { |
12884 | + if (!quiet) |
12885 | + printk("Suspend2: FileAllocator: File signature found.\n"); |
12886 | + if (!resume_time) |
12887 | + suspend_file_set_resume2(); |
12888 | + |
12889 | + suspend_bio_ops.set_devinfo(&devinfo); |
12890 | + suspend_writer_posn.chains = &block_chain; |
12891 | + suspend_writer_posn.num_chains = 1; |
12892 | + |
12893 | + if (!resume_time) |
12894 | + set_suspend_state(SUSPEND_CAN_SUSPEND); |
12895 | + return 0; |
12896 | + } |
12897 | + |
12898 | + clear_suspend_state(SUSPEND_CAN_SUSPEND); |
12899 | + |
12900 | + if (quiet) |
12901 | + return 1; |
12902 | + |
12903 | + if (*target) |
12904 | + printk("Suspend2: FileAllocator: Sorry. No signature found at" |
12905 | + " %s.\n", target); |
12906 | + else |
12907 | + if (!resume_time) |
12908 | + printk("Suspend2: FileAllocator: Sorry. Target is not" |
12909 | + " set for suspending.\n"); |
12910 | + |
12911 | + return 1; |
12912 | +} |
12913 | + |
12914 | +static void test_suspend_file_target(void) |
12915 | +{ |
12916 | + setting_suspend_file_target = 1; |
12917 | + |
12918 | + printk("Suspend2: Suspending %sabled.\n", |
12919 | + __test_suspend_file_target(suspend_file_target, 0, 1) ? |
12920 | + "dis" : "en"); |
12921 | + |
12922 | + setting_suspend_file_target = 0; |
12923 | +} |
12924 | + |
12925 | +/* |
12926 | + * Parse Image Location |
12927 | + * |
12928 | + * Attempt to parse a resume2= parameter. |
12929 | + * Swap Writer accepts: |
12930 | + * resume2=file:DEVNAME[:FIRSTBLOCK] |
12931 | + * |
12932 | + * Where: |
12933 | + * DEVNAME is convertable to a dev_t by name_to_dev_t |
12934 | + * FIRSTBLOCK is the location of the first block in the file. |
12935 | + * BLOCKSIZE is the logical blocksize >= SECTOR_SIZE & <= PAGE_SIZE, |
12936 | + * mod SECTOR_SIZE == 0 of the device. |
12937 | + * Data is validated by attempting to read a header from the |
12938 | + * location given. Failure will result in suspend_file refusing to |
12939 | + * save an image, and a reboot with correct parameters will be |
12940 | + * necessary. |
12941 | + */ |
12942 | + |
12943 | +static int suspend_file_parse_sig_location(char *commandline, |
12944 | + int only_writer, int quiet) |
12945 | +{ |
12946 | + char *thischar, *devstart = NULL, *colon = NULL, *at_symbol = NULL; |
12947 | + int result = -EINVAL, target_blocksize = 0; |
12948 | + |
12949 | + if (strncmp(commandline, "file:", 5)) { |
12950 | + if (!only_writer) |
12951 | + return 1; |
12952 | + } else |
12953 | + commandline += 5; |
12954 | + |
12955 | + /* |
12956 | + * Don't check signature again if we're beginning a cycle. If we already |
12957 | + * did the initialisation successfully, assume we'll be okay when it comes |
12958 | + * to resuming. |
12959 | + */ |
12960 | + if (suspend_file_target_bdev) |
12961 | + return 0; |
12962 | + |
12963 | + devstart = thischar = commandline; |
12964 | + while ((*thischar != ':') && (*thischar != '@') && |
12965 | + ((thischar - commandline) < 250) && (*thischar)) |
12966 | + thischar++; |
12967 | + |
12968 | + if (*thischar == ':') { |
12969 | + colon = thischar; |
12970 | + *colon = 0; |
12971 | + thischar++; |
12972 | + } |
12973 | + |
12974 | + while ((*thischar != '@') && ((thischar - commandline) < 250) && (*thischar)) |
12975 | + thischar++; |
12976 | + |
12977 | + if (*thischar == '@') { |
12978 | + at_symbol = thischar; |
12979 | + *at_symbol = 0; |
12980 | + } |
12981 | + |
12982 | + /* |
12983 | + * For the suspend_file, you can be able to resume, but not suspend, |
12984 | + * because the resume2= is set correctly, but the suspend_file_target |
12985 | + * isn't. |
12986 | + * |
12987 | + * We may have come here as a result of setting resume2 or |
12988 | + * suspend_file_target. We only test the suspend_file target in the |
12989 | + * former case (it's already done in the later), and we do it before |
12990 | + * setting the block number ourselves. It will overwrite the values |
12991 | + * given on the command line if we don't. |
12992 | + */ |
12993 | + |
12994 | + if (!setting_suspend_file_target) |
12995 | + __test_suspend_file_target(suspend_file_target, 1, 0); |
12996 | + |
12997 | + if (colon) |
12998 | + target_firstblock = (int) simple_strtoul(colon + 1, NULL, 0); |
12999 | + else |
13000 | + target_firstblock = 0; |
13001 | + |
13002 | + if (at_symbol) { |
13003 | + target_blocksize = (int) simple_strtoul(at_symbol + 1, NULL, 0); |
13004 | + if (target_blocksize & (SECTOR_SIZE - 1)) { |
13005 | + printk("FileAllocator: Blocksizes are multiples of %d.\n", SECTOR_SIZE); |
13006 | + result = -EINVAL; |
13007 | + goto out; |
13008 | + } |
13009 | + } |
13010 | + |
13011 | + if (!quiet) |
13012 | + printk("Suspend2 FileAllocator: Testing whether you can resume:\n"); |
13013 | + |
13014 | + suspend_file_get_target_info(commandline, 0, 1); |
13015 | + |
13016 | + if (!suspend_file_target_bdev || IS_ERR(suspend_file_target_bdev)) { |
13017 | + suspend_file_target_bdev = NULL; |
13018 | + result = -1; |
13019 | + goto out; |
13020 | + } |
13021 | + |
13022 | + if (target_blocksize) |
13023 | + set_devinfo(suspend_file_target_bdev, ffs(target_blocksize)); |
13024 | + |
13025 | + result = __test_suspend_file_target(commandline, 1, 0); |
13026 | + |
13027 | +out: |
13028 | + if (result) |
13029 | + clear_suspend_state(SUSPEND_CAN_SUSPEND); |
13030 | + |
13031 | + if (!quiet) |
13032 | + printk("Resuming %sabled.\n", result ? "dis" : "en"); |
13033 | + |
13034 | + if (colon) |
13035 | + *colon = ':'; |
13036 | + if (at_symbol) |
13037 | + *at_symbol = '@'; |
13038 | + |
13039 | + return result; |
13040 | +} |
13041 | + |
13042 | +/* suspend_file_save_config_info |
13043 | + * |
13044 | + * Description: Save the target's name, not for resume time, but for all_settings. |
13045 | + * Arguments: Buffer: Pointer to a buffer of size PAGE_SIZE. |
13046 | + * Returns: Number of bytes used for saving our data. |
13047 | + */ |
13048 | + |
13049 | +static int suspend_file_save_config_info(char *buffer) |
13050 | +{ |
13051 | + strcpy(buffer, suspend_file_target); |
13052 | + return strlen(suspend_file_target) + 1; |
13053 | +} |
13054 | + |
13055 | +/* suspend_file_load_config_info |
13056 | + * |
13057 | + * Description: Reload target's name. |
13058 | + * Arguments: Buffer: Pointer to the start of the data. |
13059 | + * Size: Number of bytes that were saved. |
13060 | + */ |
13061 | + |
13062 | +static void suspend_file_load_config_info(char *buffer, int size) |
13063 | +{ |
13064 | + strcpy(suspend_file_target, buffer); |
13065 | +} |
13066 | + |
13067 | +static int suspend_file_initialise(int starting_cycle) |
13068 | +{ |
13069 | + if (starting_cycle) { |
13070 | + if (suspendActiveAllocator != &suspend_fileops) |
13071 | + return 0; |
13072 | + |
13073 | + if (starting_cycle & SYSFS_SUSPEND && !*suspend_file_target) { |
13074 | + printk("FileAllocator is the active writer, " |
13075 | + "but no filename has been set.\n"); |
13076 | + return 1; |
13077 | + } |
13078 | + } |
13079 | + |
13080 | + if (suspend_file_target) |
13081 | + suspend_file_get_target_info(suspend_file_target, starting_cycle, 0); |
13082 | + |
13083 | + if (starting_cycle && (suspend_file_image_exists() == -1)) { |
13084 | + printk("%s is does not have a valid signature for suspending.\n", |
13085 | + suspend_file_target); |
13086 | + return 1; |
13087 | + } |
13088 | + |
13089 | + return 0; |
13090 | +} |
13091 | + |
13092 | +static struct suspend_sysfs_data sysfs_params[] = { |
13093 | + |
13094 | + { |
13095 | + SUSPEND2_ATTR("target", SYSFS_RW), |
13096 | + SYSFS_STRING(suspend_file_target, 256, SYSFS_NEEDS_SM_FOR_WRITE), |
13097 | + .write_side_effect = test_suspend_file_target, |
13098 | + }, |
13099 | + |
13100 | + { |
13101 | + SUSPEND2_ATTR("enabled", SYSFS_RW), |
13102 | + SYSFS_INT(&suspend_fileops.enabled, 0, 1, 0), |
13103 | + .write_side_effect = attempt_to_parse_resume_device2, |
13104 | + } |
13105 | +}; |
13106 | + |
13107 | +static struct suspend_module_ops suspend_fileops = { |
13108 | + .type = WRITER_MODULE, |
13109 | + .name = "File Allocator", |
13110 | + .directory = "file", |
13111 | + .module = THIS_MODULE, |
13112 | + .print_debug_info = suspend_file_print_debug_stats, |
13113 | + .save_config_info = suspend_file_save_config_info, |
13114 | + .load_config_info = suspend_file_load_config_info, |
13115 | + .storage_needed = suspend_file_storage_needed, |
13116 | + .initialise = suspend_file_initialise, |
13117 | + .cleanup = suspend_file_cleanup, |
13118 | + |
13119 | + .storage_available = suspend_file_storage_available, |
13120 | + .storage_allocated = suspend_file_storage_allocated, |
13121 | + .release_storage = suspend_file_release_storage, |
13122 | + .allocate_header_space = suspend_file_allocate_header_space, |
13123 | + .allocate_storage = suspend_file_allocate_storage, |
13124 | + .image_exists = suspend_file_image_exists, |
13125 | + .mark_resume_attempted = suspend_file_mark_resume_attempted, |
13126 | + .write_header_init = suspend_file_write_header_init, |
13127 | + .write_header_cleanup = suspend_file_write_header_cleanup, |
13128 | + .read_header_init = suspend_file_read_header_init, |
13129 | + .read_header_cleanup = suspend_file_read_header_cleanup, |
13130 | + .invalidate_image = suspend_file_invalidate_image, |
13131 | + .parse_sig_location = suspend_file_parse_sig_location, |
13132 | + |
13133 | + .sysfs_data = sysfs_params, |
13134 | + .num_sysfs_entries = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data), |
13135 | +}; |
13136 | + |
13137 | +/* ---- Registration ---- */ |
13138 | +static __init int suspend_file_load(void) |
13139 | +{ |
13140 | + suspend_fileops.rw_init = suspend_bio_ops.rw_init; |
13141 | + suspend_fileops.rw_cleanup = suspend_bio_ops.rw_cleanup; |
13142 | + suspend_fileops.read_chunk = suspend_bio_ops.read_chunk; |
13143 | + suspend_fileops.write_chunk = suspend_bio_ops.write_chunk; |
13144 | + suspend_fileops.rw_header_chunk = suspend_bio_ops.rw_header_chunk; |
13145 | + |
13146 | + return suspend_register_module(&suspend_fileops); |
13147 | +} |
13148 | + |
13149 | +#ifdef MODULE |
13150 | +static __exit void suspend_file_unload(void) |
13151 | +{ |
13152 | + suspend_unregister_module(&suspend_fileops); |
13153 | +} |
13154 | + |
13155 | +module_init(suspend_file_load); |
13156 | +module_exit(suspend_file_unload); |
13157 | +MODULE_LICENSE("GPL"); |
13158 | +MODULE_AUTHOR("Nigel Cunningham"); |
13159 | +MODULE_DESCRIPTION("Suspend2 FileAllocator"); |
13160 | +#else |
13161 | +late_initcall(suspend_file_load); |
13162 | +#endif |
13163 | diff --git a/kernel/power/suspend_swap.c b/kernel/power/suspend_swap.c |
13164 | new file mode 100644 |
13165 | index 0000000..a81dcc1 |
13166 | --- /dev/null |
13167 | +++ b/kernel/power/suspend_swap.c |
13168 | @@ -0,0 +1,1262 @@ |
13169 | +/* |
13170 | + * kernel/power/suspend_swap.c |
13171 | + * |
13172 | + * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
13173 | + * |
13174 | + * Distributed under GPLv2. |
13175 | + * |
13176 | + * This file encapsulates functions for usage of swap space as a |
13177 | + * backing store. |
13178 | + */ |
13179 | + |
13180 | +#include <linux/suspend.h> |
13181 | +#include <linux/module.h> |
13182 | +#include <linux/blkdev.h> |
13183 | +#include <linux/swapops.h> |
13184 | +#include <linux/swap.h> |
13185 | +#include <linux/syscalls.h> |
13186 | + |
13187 | +#include "suspend.h" |
13188 | +#include "sysfs.h" |
13189 | +#include "modules.h" |
13190 | +#include "io.h" |
13191 | +#include "ui.h" |
13192 | +#include "extent.h" |
13193 | +#include "block_io.h" |
13194 | + |
13195 | +static struct suspend_module_ops suspend_swapops; |
13196 | + |
13197 | +#define SIGNATURE_VER 6 |
13198 | + |
13199 | +/* --- Struct of pages stored on disk */ |
13200 | + |
13201 | +union diskpage { |
13202 | + union swap_header swh; /* swh.magic is the only member used */ |
13203 | +}; |
13204 | + |
13205 | +union p_diskpage { |
13206 | + union diskpage *pointer; |
13207 | + char *ptr; |
13208 | + unsigned long address; |
13209 | +}; |
13210 | + |
13211 | +/* Devices used for swap */ |
13212 | +static struct suspend_bdev_info devinfo[MAX_SWAPFILES]; |
13213 | + |
13214 | +/* Extent chains for swap & blocks */ |
13215 | +struct extent_chain swapextents; |
13216 | +struct extent_chain block_chain[MAX_SWAPFILES]; |
13217 | + |
13218 | +static dev_t header_dev_t; |
13219 | +static struct block_device *header_block_device; |
13220 | +static unsigned long headerblock; |
13221 | + |
13222 | +/* For swapfile automatically swapon/off'd. */ |
13223 | +static char swapfilename[32] = ""; |
13224 | +static int suspend_swapon_status; |
13225 | + |
13226 | +/* Header Page Information */ |
13227 | +static int header_pages_allocated; |
13228 | + |
13229 | +/* Swap Pages */ |
13230 | +static int main_pages_allocated, main_pages_requested; |
13231 | + |
13232 | +/* User Specified Parameters. */ |
13233 | + |
13234 | +static unsigned long resume_firstblock; |
13235 | +static int resume_blocksize; |
13236 | +static dev_t resume_swap_dev_t; |
13237 | +static struct block_device *resume_block_device; |
13238 | + |
13239 | +struct sysinfo swapinfo; |
13240 | +static int suspend_swap_invalidate_image(void); |
13241 | + |
13242 | +/* Block devices open. */ |
13243 | +struct bdev_opened |
13244 | +{ |
13245 | + dev_t device; |
13246 | + struct block_device *bdev; |
13247 | + int claimed; |
13248 | +}; |
13249 | + |
13250 | +/* |
13251 | + * Entry MAX_SWAPFILES is the resume block device, which may |
13252 | + * not be a swap device enabled when we suspend. |
13253 | + * Entry MAX_SWAPFILES + 1 is the header block device, which |
13254 | + * is needed before we find out which slot it occupies. |
13255 | + */ |
13256 | +static struct bdev_opened *bdev_info_list[MAX_SWAPFILES + 2]; |
13257 | + |
13258 | +static void close_bdev(int i) |
13259 | +{ |
13260 | + struct bdev_opened *this = bdev_info_list[i]; |
13261 | + |
13262 | + if (this->claimed) |
13263 | + bd_release(this->bdev); |
13264 | + |
13265 | + /* Release our reference. */ |
13266 | + blkdev_put(this->bdev); |
13267 | + |
13268 | + /* Free our info. */ |
13269 | + kfree(this); |
13270 | + |
13271 | + bdev_info_list[i] = NULL; |
13272 | +} |
13273 | + |
13274 | +static void close_bdevs(void) |
13275 | +{ |
13276 | + int i; |
13277 | + |
13278 | + for (i = 0; i < MAX_SWAPFILES; i++) |
13279 | + if (bdev_info_list[i]) |
13280 | + close_bdev(i); |
13281 | + |
13282 | + resume_block_device = header_block_device = NULL; |
13283 | +} |
13284 | + |
13285 | +static struct block_device *open_bdev(int index, dev_t device, int display_errs) |
13286 | +{ |
13287 | + struct bdev_opened *this; |
13288 | + struct block_device *bdev; |
13289 | + |
13290 | + if (bdev_info_list[index] && (bdev_info_list[index]->device == device)){ |
13291 | + bdev = bdev_info_list[index]->bdev; |
13292 | + return bdev; |
13293 | + } |
13294 | + |
13295 | + if (bdev_info_list[index] && bdev_info_list[index]->device != device) |
13296 | + close_bdev(index); |
13297 | + |
13298 | + bdev = open_by_devnum(device, FMODE_READ); |
13299 | + |
13300 | + if (IS_ERR(bdev) || !bdev) { |
13301 | + if (display_errs) |
13302 | + suspend_early_boot_message(1,SUSPEND_CONTINUE_REQ, |
13303 | + "Failed to get access to block device " |
13304 | + "\"%x\" (error %d).\n Maybe you need " |
13305 | + "to run mknod and/or lvmsetup in an " |
13306 | + "initrd/ramfs?", device, bdev); |
13307 | + return ERR_PTR(-EINVAL); |
13308 | + } |
13309 | + |
13310 | + this = kmalloc(sizeof(struct bdev_opened), GFP_KERNEL); |
13311 | + if (!this) { |
13312 | + printk(KERN_WARNING "Suspend2: Failed to allocate memory for " |
13313 | + "opening a bdev."); |
13314 | + return ERR_PTR(-ENOMEM); |
13315 | + } |
13316 | + |
13317 | + bdev_info_list[index] = this; |
13318 | + this->device = device; |
13319 | + this->bdev = bdev; |
13320 | + |
13321 | + if (index < MAX_SWAPFILES) |
13322 | + devinfo[index].bdev = bdev; |
13323 | + |
13324 | + return bdev; |
13325 | +} |
13326 | + |
13327 | +/* Must be silent - might be called from cat /sys/power/suspend2/debug_info |
13328 | + * Returns 0 if was off, -EBUSY if was on, error value otherwise. |
13329 | + */ |
13330 | +static int enable_swapfile(void) |
13331 | +{ |
13332 | + int activateswapresult = -EINVAL; |
13333 | + |
13334 | + if (suspend_swapon_status) |
13335 | + return 0; |
13336 | + |
13337 | + if (swapfilename[0]) { |
13338 | + /* Attempt to swap on with maximum priority */ |
13339 | + activateswapresult = sys_swapon(swapfilename, 0xFFFF); |
13340 | + if ((activateswapresult) && (activateswapresult != -EBUSY)) |
13341 | + printk("Suspend2: The swapfile/partition specified by " |
13342 | + "/sys/power/suspend2/suspend_swap/swapfile " |
13343 | + "(%s) could not be turned on (error %d). " |
13344 | + "Attempting to continue.\n", |
13345 | + swapfilename, activateswapresult); |
13346 | + if (!activateswapresult) |
13347 | + suspend_swapon_status = 1; |
13348 | + } |
13349 | + return activateswapresult; |
13350 | +} |
13351 | + |
13352 | +/* Returns 0 if was on, -EINVAL if was off, error value otherwise */ |
13353 | +static int disable_swapfile(void) |
13354 | +{ |
13355 | + int result = -EINVAL; |
13356 | + |
13357 | + if (!suspend_swapon_status) |
13358 | + return 0; |
13359 | + |
13360 | + if (swapfilename[0]) { |
13361 | + result = sys_swapoff(swapfilename); |
13362 | + if (result == -EINVAL) |
13363 | + return 0; /* Wasn't on */ |
13364 | + if (!result) |
13365 | + suspend_swapon_status = 0; |
13366 | + } |
13367 | + |
13368 | + return result; |
13369 | +} |
13370 | + |
13371 | +static int try_to_parse_resume_device(char *commandline, int quiet) |
13372 | +{ |
13373 | + struct kstat stat; |
13374 | + int error = 0; |
13375 | + |
13376 | + resume_swap_dev_t = name_to_dev_t(commandline); |
13377 | + |
13378 | + if (!resume_swap_dev_t) { |
13379 | + struct file *file = filp_open(commandline, O_RDONLY, 0); |
13380 | + |
13381 | + if (!IS_ERR(file) && file) { |
13382 | + vfs_getattr(file->f_vfsmnt, file->f_dentry, &stat); |
13383 | + filp_close(file, NULL); |
13384 | + } else |
13385 | + error = vfs_stat(commandline, &stat); |
13386 | + if (!error) |
13387 | + resume_swap_dev_t = stat.rdev; |
13388 | + } |
13389 | + |
13390 | + if (!resume_swap_dev_t) { |
13391 | + if (quiet) |
13392 | + return 1; |
13393 | + |
13394 | + if (test_suspend_state(SUSPEND_TRYING_TO_RESUME)) |
13395 | + suspend_early_boot_message(1, SUSPEND_CONTINUE_REQ, |
13396 | + "Failed to translate \"%s\" into a device id.\n", |
13397 | + commandline); |
13398 | + else |
13399 | + printk("Suspend2: Can't translate \"%s\" into a device " |
13400 | + "id yet.\n", commandline); |
13401 | + return 1; |
13402 | + } |
13403 | + |
13404 | + resume_block_device = open_bdev(MAX_SWAPFILES, resume_swap_dev_t, 0); |
13405 | + if (IS_ERR(resume_block_device)) { |
13406 | + if (!quiet) |
13407 | + suspend_early_boot_message(1, SUSPEND_CONTINUE_REQ, |
13408 | + "Failed to get access to \"%s\", where" |
13409 | + " the swap header should be found.", |
13410 | + commandline); |
13411 | + return 1; |
13412 | + } |
13413 | + |
13414 | + return 0; |
13415 | +} |
13416 | + |
13417 | +/* |
13418 | + * If we have read part of the image, we might have filled memory with |
13419 | + * data that should be zeroed out. |
13420 | + */ |
13421 | +static void suspend_swap_noresume_reset(void) |
13422 | +{ |
13423 | + memset((char *) &devinfo, 0, sizeof(devinfo)); |
13424 | +} |
13425 | + |
13426 | +static int parse_signature(char *header, int restore) |
13427 | +{ |
13428 | + int type = -1; |
13429 | + |
13430 | + if (!memcmp("SWAP-SPACE",header,10)) |
13431 | + return 0; |
13432 | + else if (!memcmp("SWAPSPACE2",header,10)) |
13433 | + return 1; |
13434 | + |
13435 | + else if (!memcmp("S1SUSP",header,6)) |
13436 | + type = 2; |
13437 | + else if (!memcmp("S2SUSP",header,6)) |
13438 | + type = 3; |
13439 | + else if (!memcmp("S1SUSPEND",header,9)) |
13440 | + type = 4; |
13441 | + |
13442 | + else if (!memcmp("z",header,1)) |
13443 | + type = 12; |
13444 | + else if (!memcmp("Z",header,1)) |
13445 | + type = 13; |
13446 | + |
13447 | + /* |
13448 | + * Put bdev of suspend header in last byte of swap header |
13449 | + * (unsigned short) |
13450 | + */ |
13451 | + if (type > 11) { |
13452 | + dev_t *header_ptr = (dev_t *) &header[1]; |
13453 | + unsigned char *headerblocksize_ptr = |
13454 | + (unsigned char *) &header[5]; |
13455 | + u32 *headerblock_ptr = (u32 *) &header[6]; |
13456 | + header_dev_t = *header_ptr; |
13457 | + /* |
13458 | + * We are now using the highest bit of the char to indicate |
13459 | + * whether we have attempted to resume from this image before. |
13460 | + */ |
13461 | + clear_suspend_state(SUSPEND_RESUMED_BEFORE); |
13462 | + if (((int) *headerblocksize_ptr) & 0x80) |
13463 | + set_suspend_state(SUSPEND_RESUMED_BEFORE); |
13464 | + headerblock = (unsigned long) *headerblock_ptr; |
13465 | + } |
13466 | + |
13467 | + if ((restore) && (type > 5)) { |
13468 | + /* We only reset our own signatures */ |
13469 | + if (type & 1) |
13470 | + memcpy(header,"SWAPSPACE2",10); |
13471 | + else |
13472 | + memcpy(header,"SWAP-SPACE",10); |
13473 | + } |
13474 | + |
13475 | + return type; |
13476 | +} |
13477 | + |
13478 | +/* |
13479 | + * prepare_signature |
13480 | + */ |
13481 | +static int prepare_signature(dev_t bdev, unsigned long block, |
13482 | + char *current_header) |
13483 | +{ |
13484 | + int current_type = parse_signature(current_header, 0); |
13485 | + dev_t *header_ptr = (dev_t *) (¤t_header[1]); |
13486 | + unsigned long *headerblock_ptr = |
13487 | + (unsigned long *) (¤t_header[6]); |
13488 | + |
13489 | + if ((current_type > 1) && (current_type < 6)) |
13490 | + return 1; |
13491 | + |
13492 | + /* At the moment, I don't have a way to handle the block being |
13493 | + * > 32 bits. Not enough room in the signature and no way to |
13494 | + * safely put the data elsewhere. */ |
13495 | + |
13496 | + if (BITS_PER_LONG == 64 && ffs(block) > 31) { |
13497 | + suspend_prepare_status(DONT_CLEAR_BAR, |
13498 | + "Header sector requires 33+ bits. " |
13499 | + "Would not be able to resume."); |
13500 | + return 1; |
13501 | + } |
13502 | + |
13503 | + if (current_type & 1) |
13504 | + current_header[0] = 'Z'; |
13505 | + else |
13506 | + current_header[0] = 'z'; |
13507 | + *header_ptr = bdev; |
13508 | + /* prev is the first/last swap page of the resume area */ |
13509 | + *headerblock_ptr = (unsigned long) block; |
13510 | + return 0; |
13511 | +} |
13512 | + |
13513 | +static int __suspend_swap_allocate_storage(int main_storage_requested, |
13514 | + int header_storage); |
13515 | + |
13516 | +static int suspend_swap_allocate_header_space(int space_requested) |
13517 | +{ |
13518 | + int i; |
13519 | + |
13520 | + if (!swapextents.size && __suspend_swap_allocate_storage( |
13521 | + main_pages_requested, space_requested)) { |
13522 | + printk("Failed to allocate space for the header.\n"); |
13523 | + return -ENOSPC; |
13524 | + } |
13525 | + |
13526 | + suspend_extent_state_goto_start(&suspend_writer_posn); |
13527 | + suspend_bio_ops.forward_one_page(); /* To first page */ |
13528 | + |
13529 | + for (i = 0; i < space_requested; i++) { |
13530 | + if (suspend_bio_ops.forward_one_page()) { |
13531 | + printk("Out of space while seeking to allocate " |
13532 | + "header pages,\n"); |
13533 | + header_pages_allocated = i; |
13534 | + return -ENOSPC; |
13535 | + } |
13536 | + |
13537 | + } |
13538 | + |
13539 | + header_pages_allocated = space_requested; |
13540 | + |
13541 | + /* The end of header pages will be the start of pageset 2; |
13542 | + * we are now sitting on the first pageset2 page. */ |
13543 | + suspend_extent_state_save(&suspend_writer_posn, |
13544 | + &suspend_writer_posn_save[2]); |
13545 | + return 0; |
13546 | +} |
13547 | + |
13548 | +static void get_main_pool_phys_params(void) |
13549 | +{ |
13550 | + struct extent *extentpointer = NULL; |
13551 | + unsigned long address; |
13552 | + int i, extent_min = -1, extent_max = -1, last_chain = -1; |
13553 | + |
13554 | + for (i = 0; i < MAX_SWAPFILES; i++) |
13555 | + if (block_chain[i].first) |
13556 | + suspend_put_extent_chain(&block_chain[i]); |
13557 | + |
13558 | + suspend_extent_for_each(&swapextents, extentpointer, address) { |
13559 | + swp_entry_t swap_address = extent_val_to_swap_entry(address); |
13560 | + pgoff_t offset = swp_offset(swap_address); |
13561 | + unsigned swapfilenum = swp_type(swap_address); |
13562 | + struct swap_info_struct *sis = get_swap_info_struct(swapfilenum); |
13563 | + sector_t new_sector = map_swap_page(sis, offset); |
13564 | + |
13565 | + if ((new_sector == extent_max + 1) && |
13566 | + (last_chain == swapfilenum)) |
13567 | + extent_max++; |
13568 | + else { |
13569 | + if (extent_min > -1) { |
13570 | + if (test_action_state(SUSPEND_TEST_BIO)) |
13571 | + printk("Adding extent chain %d %d-%d.\n", |
13572 | + swapfilenum, |
13573 | + extent_min << |
13574 | + devinfo[last_chain].bmap_shift, |
13575 | + extent_max << |
13576 | + devinfo[last_chain].bmap_shift); |
13577 | + |
13578 | + suspend_add_to_extent_chain( |
13579 | + &block_chain[last_chain], |
13580 | + extent_min, extent_max); |
13581 | + } |
13582 | + extent_min = extent_max = new_sector; |
13583 | + last_chain = swapfilenum; |
13584 | + } |
13585 | + } |
13586 | + |
13587 | + if (extent_min > -1) { |
13588 | + if (test_action_state(SUSPEND_TEST_BIO)) |
13589 | + printk("Adding extent chain %d %d-%d.\n", |
13590 | + last_chain, |
13591 | + extent_min << |
13592 | + devinfo[last_chain].bmap_shift, |
13593 | + extent_max << |
13594 | + devinfo[last_chain].bmap_shift); |
13595 | + suspend_add_to_extent_chain( |
13596 | + &block_chain[last_chain], |
13597 | + extent_min, extent_max); |
13598 | + } |
13599 | + |
13600 | + suspend_swap_allocate_header_space(header_pages_allocated); |
13601 | +} |
13602 | + |
13603 | +static int suspend_swap_storage_allocated(void) |
13604 | +{ |
13605 | + return main_pages_requested + header_pages_allocated; |
13606 | +} |
13607 | + |
13608 | +static int suspend_swap_storage_available(void) |
13609 | +{ |
13610 | + si_swapinfo(&swapinfo); |
13611 | + return (((int) swapinfo.freeswap + main_pages_allocated) * PAGE_SIZE / |
13612 | + (PAGE_SIZE + sizeof(unsigned long) + sizeof(int))); |
13613 | +} |
13614 | + |
13615 | +static int suspend_swap_initialise(int starting_cycle) |
13616 | +{ |
13617 | + if (!starting_cycle) |
13618 | + return 0; |
13619 | + |
13620 | + enable_swapfile(); |
13621 | + |
13622 | + if (resume_swap_dev_t && !resume_block_device && |
13623 | + IS_ERR(resume_block_device = |
13624 | + open_bdev(MAX_SWAPFILES, resume_swap_dev_t, 1))) |
13625 | + return 1; |
13626 | + |
13627 | + return 0; |
13628 | +} |
13629 | + |
13630 | +static void suspend_swap_cleanup(int ending_cycle) |
13631 | +{ |
13632 | + if (ending_cycle) |
13633 | + disable_swapfile(); |
13634 | + |
13635 | + close_bdevs(); |
13636 | +} |
13637 | + |
13638 | +static int suspend_swap_release_storage(void) |
13639 | +{ |
13640 | + int i = 0; |
13641 | + |
13642 | + if (test_action_state(SUSPEND_KEEP_IMAGE) && |
13643 | + test_suspend_state(SUSPEND_NOW_RESUMING)) |
13644 | + return 0; |
13645 | + |
13646 | + header_pages_allocated = 0; |
13647 | + main_pages_allocated = 0; |
13648 | + |
13649 | + if (swapextents.first) { |
13650 | + /* Free swap entries */ |
13651 | + struct extent *extentpointer; |
13652 | + unsigned long extentvalue; |
13653 | + suspend_extent_for_each(&swapextents, extentpointer, |
13654 | + extentvalue) |
13655 | + swap_free(extent_val_to_swap_entry(extentvalue)); |
13656 | + |
13657 | + suspend_put_extent_chain(&swapextents); |
13658 | + |
13659 | + for (i = 0; i < MAX_SWAPFILES; i++) |
13660 | + if (block_chain[i].first) |
13661 | + suspend_put_extent_chain(&block_chain[i]); |
13662 | + } |
13663 | + |
13664 | + return 0; |
13665 | +} |
13666 | + |
13667 | +static int suspend_swap_allocate_storage(int space_requested) |
13668 | +{ |
13669 | + if (!__suspend_swap_allocate_storage(space_requested, |
13670 | + header_pages_allocated)) { |
13671 | + main_pages_requested = space_requested; |
13672 | + return 0; |
13673 | + } |
13674 | + |
13675 | + return -ENOSPC; |
13676 | +} |
13677 | + |
13678 | +static void free_swap_range(unsigned long min, unsigned long max) |
13679 | +{ |
13680 | + int j; |
13681 | + |
13682 | + for (j = min; j < max; j++) |
13683 | + swap_free(extent_val_to_swap_entry(j)); |
13684 | +} |
13685 | + |
13686 | +/* |
13687 | + * Round robin allocation (where swap storage has the same priority). |
13688 | + * could make this very inefficient, so we track extents allocated on |
13689 | + * a per-swapfiles basis. |
13690 | + */ |
13691 | +static int __suspend_swap_allocate_storage(int main_space_requested, |
13692 | + int header_space_requested) |
13693 | +{ |
13694 | + int i, result = 0, first[MAX_SWAPFILES], pages_to_get, extra_pages, gotten = 0; |
13695 | + unsigned long extent_min[MAX_SWAPFILES], extent_max[MAX_SWAPFILES]; |
13696 | + |
13697 | + extra_pages = DIV_ROUND_UP(main_space_requested * (sizeof(unsigned long) |
13698 | + + sizeof(int)), PAGE_SIZE); |
13699 | + pages_to_get = main_space_requested + extra_pages + |
13700 | + header_space_requested - swapextents.size; |
13701 | + |
13702 | + if (pages_to_get < 1) |
13703 | + return 0; |
13704 | + |
13705 | + for (i=0; i < MAX_SWAPFILES; i++) { |
13706 | + struct swap_info_struct *si = get_swap_info_struct(i); |
13707 | + if ((devinfo[i].bdev = si->bdev)) |
13708 | + devinfo[i].dev_t = si->bdev->bd_dev; |
13709 | + devinfo[i].bmap_shift = 3; |
13710 | + devinfo[i].blocks_per_page = 1; |
13711 | + first[i] = 1; |
13712 | + } |
13713 | + |
13714 | + for(i=0; i < pages_to_get; i++) { |
13715 | + swp_entry_t entry; |
13716 | + unsigned long new_value; |
13717 | + unsigned swapfilenum; |
13718 | + |
13719 | + entry = get_swap_page(); |
13720 | + if (!entry.val) |
13721 | + break; |
13722 | + |
13723 | + swapfilenum = swp_type(entry); |
13724 | + new_value = swap_entry_to_extent_val(entry); |
13725 | + |
13726 | + if (first[swapfilenum]) { |
13727 | + first[swapfilenum] = 0; |
13728 | + extent_min[swapfilenum] = new_value; |
13729 | + extent_max[swapfilenum] = new_value; |
13730 | + gotten++; |
13731 | + continue; |
13732 | + } |
13733 | + |
13734 | + if (new_value == extent_max[swapfilenum] + 1) { |
13735 | + extent_max[swapfilenum]++; |
13736 | + gotten++; |
13737 | + continue; |
13738 | + } |
13739 | + |
13740 | + if (suspend_add_to_extent_chain(&swapextents, |
13741 | + extent_min[swapfilenum], |
13742 | + extent_max[swapfilenum])) { |
13743 | + free_swap_range(extent_min[swapfilenum], |
13744 | + extent_max[swapfilenum]); |
13745 | + swap_free(entry); |
13746 | + gotten -= (extent_max[swapfilenum] - |
13747 | + extent_min[swapfilenum]); |
13748 | + break; |
13749 | + } else { |
13750 | + extent_min[swapfilenum] = new_value; |
13751 | + extent_max[swapfilenum] = new_value; |
13752 | + gotten++; |
13753 | + } |
13754 | + } |
13755 | + |
13756 | + for (i = 0; i < MAX_SWAPFILES; i++) |
13757 | + if (!first[i] && suspend_add_to_extent_chain(&swapextents, |
13758 | + extent_min[i], extent_max[i])) { |
13759 | + free_swap_range(extent_min[i], extent_max[i]); |
13760 | + gotten -= (extent_max[i] - extent_min[i]); |
13761 | + } |
13762 | + |
13763 | + if (gotten < pages_to_get) |
13764 | + result = -ENOSPC; |
13765 | + |
13766 | + main_pages_allocated += gotten; |
13767 | + get_main_pool_phys_params(); |
13768 | + return result; |
13769 | +} |
13770 | + |
13771 | +static int suspend_swap_write_header_init(void) |
13772 | +{ |
13773 | + int i, result; |
13774 | + struct swap_info_struct *si; |
13775 | + |
13776 | + suspend_extent_state_goto_start(&suspend_writer_posn); |
13777 | + |
13778 | + suspend_writer_buffer_posn = suspend_header_bytes_used = 0; |
13779 | + |
13780 | + /* Info needed to bootstrap goes at the start of the header. |
13781 | + * First we save the positions and devinfo, including the number |
13782 | + * of header pages. Then we save the structs containing data needed |
13783 | + * for reading the header pages back. |
13784 | + * Note that even if header pages take more than one page, when we |
13785 | + * read back the info, we will have restored the location of the |
13786 | + * next header page by the time we go to use it. |
13787 | + */ |
13788 | + |
13789 | + /* Forward one page will be done prior to the read */ |
13790 | + for (i = 0; i < MAX_SWAPFILES; i++) { |
13791 | + si = get_swap_info_struct(i); |
13792 | + if (si->swap_file) |
13793 | + devinfo[i].dev_t = si->bdev->bd_dev; |
13794 | + else |
13795 | + devinfo[i].dev_t = (dev_t) 0; |
13796 | + } |
13797 | + |
13798 | + if ((result = suspend_bio_ops.rw_header_chunk(WRITE, |
13799 | + &suspend_swapops, |
13800 | + (char *) &suspend_writer_posn_save, |
13801 | + sizeof(suspend_writer_posn_save)))) |
13802 | + return result; |
13803 | + |
13804 | + if ((result = suspend_bio_ops.rw_header_chunk(WRITE, |
13805 | + &suspend_swapops, |
13806 | + (char *) &devinfo, sizeof(devinfo)))) |
13807 | + return result; |
13808 | + |
13809 | + for (i=0; i < MAX_SWAPFILES; i++) |
13810 | + suspend_serialise_extent_chain(&suspend_swapops, &block_chain[i]); |
13811 | + |
13812 | + return 0; |
13813 | +} |
13814 | + |
13815 | +static int suspend_swap_write_header_cleanup(void) |
13816 | +{ |
13817 | + int result; |
13818 | + struct swap_info_struct *si; |
13819 | + |
13820 | + /* Write any unsaved data */ |
13821 | + if (suspend_writer_buffer_posn) |
13822 | + suspend_bio_ops.write_header_chunk_finish(); |
13823 | + |
13824 | + suspend_bio_ops.finish_all_io(); |
13825 | + |
13826 | + suspend_extent_state_goto_start(&suspend_writer_posn); |
13827 | + suspend_bio_ops.forward_one_page(); |
13828 | + |
13829 | + /* Adjust swap header */ |
13830 | + suspend_bio_ops.bdev_page_io(READ, resume_block_device, |
13831 | + resume_firstblock, |
13832 | + virt_to_page(suspend_writer_buffer)); |
13833 | + |
13834 | + si = get_swap_info_struct(suspend_writer_posn.current_chain); |
13835 | + result = prepare_signature(si->bdev->bd_dev, |
13836 | + suspend_writer_posn.current_offset, |
13837 | + ((union swap_header *) suspend_writer_buffer)->magic.magic); |
13838 | + |
13839 | + if (!result) |
13840 | + suspend_bio_ops.bdev_page_io(WRITE, resume_block_device, |
13841 | + resume_firstblock, |
13842 | + virt_to_page(suspend_writer_buffer)); |
13843 | + |
13844 | + suspend_bio_ops.finish_all_io(); |
13845 | + |
13846 | + return result; |
13847 | +} |
13848 | + |
13849 | +/* ------------------------- HEADER READING ------------------------- */ |
13850 | + |
13851 | +/* |
13852 | + * read_header_init() |
13853 | + * |
13854 | + * Description: |
13855 | + * 1. Attempt to read the device specified with resume2=. |
13856 | + * 2. Check the contents of the swap header for our signature. |
13857 | + * 3. Warn, ignore, reset and/or continue as appropriate. |
13858 | + * 4. If continuing, read the suspend_swap configuration section |
13859 | + * of the header and set up block device info so we can read |
13860 | + * the rest of the header & image. |
13861 | + * |
13862 | + * Returns: |
13863 | + * May not return if user choose to reboot at a warning. |
13864 | + * -EINVAL if cannot resume at this time. Booting should continue |
13865 | + * normally. |
13866 | + */ |
13867 | + |
13868 | +static int suspend_swap_read_header_init(void) |
13869 | +{ |
13870 | + int i, result = 0; |
13871 | + |
13872 | + suspend_header_bytes_used = 0; |
13873 | + |
13874 | + if (!header_dev_t) { |
13875 | + printk("read_header_init called when we haven't " |
13876 | + "verified there is an image!\n"); |
13877 | + return -EINVAL; |
13878 | + } |
13879 | + |
13880 | + /* |
13881 | + * If the header is not on the resume_swap_dev_t, get the resume device first. |
13882 | + */ |
13883 | + if (header_dev_t != resume_swap_dev_t) { |
13884 | + header_block_device = open_bdev(MAX_SWAPFILES + 1, |
13885 | + header_dev_t, 1); |
13886 | + |
13887 | + if (IS_ERR(header_block_device)) |
13888 | + return PTR_ERR(header_block_device); |
13889 | + } else |
13890 | + header_block_device = resume_block_device; |
13891 | + |
13892 | + /* |
13893 | + * Read suspend_swap configuration. |
13894 | + * Headerblock size taken into account already. |
13895 | + */ |
13896 | + suspend_bio_ops.bdev_page_io(READ, header_block_device, |
13897 | + headerblock << 3, |
13898 | + virt_to_page((unsigned long) suspend_writer_buffer)); |
13899 | + |
13900 | + memcpy(&suspend_writer_posn_save, suspend_writer_buffer, 3 * sizeof(struct extent_iterate_saved_state)); |
13901 | + |
13902 | + suspend_writer_buffer_posn = 3 * sizeof(struct extent_iterate_saved_state); |
13903 | + suspend_header_bytes_used += 3 * sizeof(struct extent_iterate_saved_state); |
13904 | + |
13905 | + memcpy(&devinfo, suspend_writer_buffer + suspend_writer_buffer_posn, sizeof(devinfo)); |
13906 | + |
13907 | + suspend_writer_buffer_posn += sizeof(devinfo); |
13908 | + suspend_header_bytes_used += sizeof(devinfo); |
13909 | + |
13910 | + /* Restore device info */ |
13911 | + for (i = 0; i < MAX_SWAPFILES; i++) { |
13912 | + dev_t thisdevice = devinfo[i].dev_t; |
13913 | + struct block_device *result; |
13914 | + |
13915 | + devinfo[i].bdev = NULL; |
13916 | + |
13917 | + if (!thisdevice) |
13918 | + continue; |
13919 | + |
13920 | + if (thisdevice == resume_swap_dev_t) { |
13921 | + devinfo[i].bdev = resume_block_device; |
13922 | + bdev_info_list[i] = bdev_info_list[MAX_SWAPFILES]; |
13923 | + bdev_info_list[MAX_SWAPFILES] = NULL; |
13924 | + continue; |
13925 | + } |
13926 | + |
13927 | + if (thisdevice == header_dev_t) { |
13928 | + devinfo[i].bdev = header_block_device; |
13929 | + bdev_info_list[i] = bdev_info_list[MAX_SWAPFILES + 1]; |
13930 | + bdev_info_list[MAX_SWAPFILES + 1] = NULL; |
13931 | + continue; |
13932 | + } |
13933 | + |
13934 | + result = open_bdev(i, thisdevice, 1); |
13935 | + if (IS_ERR(result)) |
13936 | + return PTR_ERR(result); |
13937 | + } |
13938 | + |
13939 | + suspend_bio_ops.read_header_init(); |
13940 | + suspend_extent_state_goto_start(&suspend_writer_posn); |
13941 | + suspend_bio_ops.set_extra_page_forward(); |
13942 | + |
13943 | + for (i = 0; i < MAX_SWAPFILES && !result; i++) |
13944 | + result = suspend_load_extent_chain(&block_chain[i]); |
13945 | + |
13946 | + return result; |
13947 | +} |
13948 | + |
13949 | +static int suspend_swap_read_header_cleanup(void) |
13950 | +{ |
13951 | + suspend_bio_ops.rw_cleanup(READ); |
13952 | + return 0; |
13953 | +} |
13954 | + |
13955 | +/* suspend_swap_invalidate_image |
13956 | + * |
13957 | + */ |
13958 | +static int suspend_swap_invalidate_image(void) |
13959 | +{ |
13960 | + union p_diskpage cur; |
13961 | + int result = 0; |
13962 | + char newsig[11]; |
13963 | + |
13964 | + cur.address = get_zeroed_page(GFP_ATOMIC); |
13965 | + if (!cur.address) { |
13966 | + printk("Unable to allocate a page for restoring the swap signature.\n"); |
13967 | + return -ENOMEM; |
13968 | + } |
13969 | + |
13970 | + /* |
13971 | + * If nr_suspends == 0, we must be booting, so no swap pages |
13972 | + * will be recorded as used yet. |
13973 | + */ |
13974 | + |
13975 | + if (nr_suspends > 0) |
13976 | + suspend_swap_release_storage(); |
13977 | + |
13978 | + /* |
13979 | + * We don't do a sanity check here: we want to restore the swap |
13980 | + * whatever version of kernel made the suspend image. |
13981 | + * |
13982 | + * We need to write swap, but swap may not be enabled so |
13983 | + * we write the device directly |
13984 | + */ |
13985 | + |
13986 | + suspend_bio_ops.bdev_page_io(READ, resume_block_device, |
13987 | + resume_firstblock, |
13988 | + virt_to_page(cur.pointer)); |
13989 | + |
13990 | + result = parse_signature(cur.pointer->swh.magic.magic, 1); |
13991 | + |
13992 | + if (result < 5) |
13993 | + goto out; |
13994 | + |
13995 | + strncpy(newsig, cur.pointer->swh.magic.magic, 10); |
13996 | + newsig[10] = 0; |
13997 | + |
13998 | + suspend_bio_ops.bdev_page_io(WRITE, resume_block_device, |
13999 | + resume_firstblock, |
14000 | + virt_to_page(cur.pointer)); |
14001 | + |
14002 | + if (!nr_suspends) |
14003 | + printk(KERN_WARNING "Suspend2: Image invalidated.\n"); |
14004 | +out: |
14005 | + suspend_bio_ops.finish_all_io(); |
14006 | + free_page(cur.address); |
14007 | + return 0; |
14008 | +} |
14009 | + |
14010 | +/* |
14011 | + * workspace_size |
14012 | + * |
14013 | + * Description: |
14014 | + * Returns the number of bytes of RAM needed for this |
14015 | + * code to do its work. (Used when calculating whether |
14016 | + * we have enough memory to be able to suspend & resume). |
14017 | + * |
14018 | + */ |
14019 | +static int suspend_swap_memory_needed(void) |
14020 | +{ |
14021 | + return 1; |
14022 | +} |
14023 | + |
14024 | +/* |
14025 | + * Print debug info |
14026 | + * |
14027 | + * Description: |
14028 | + */ |
14029 | +static int suspend_swap_print_debug_stats(char *buffer, int size) |
14030 | +{ |
14031 | + int len = 0; |
14032 | + struct sysinfo sysinfo; |
14033 | + |
14034 | + if (suspendActiveAllocator != &suspend_swapops) { |
14035 | + len = snprintf_used(buffer, size, "- SwapAllocator inactive.\n"); |
14036 | + return len; |
14037 | + } |
14038 | + |
14039 | + len = snprintf_used(buffer, size, "- SwapAllocator active.\n"); |
14040 | + if (swapfilename[0]) |
14041 | + len+= snprintf_used(buffer+len, size-len, |
14042 | + " Attempting to automatically swapon: %s.\n", swapfilename); |
14043 | + |
14044 | + si_swapinfo(&sysinfo); |
14045 | + |
14046 | + len+= snprintf_used(buffer+len, size-len, " Swap available for image: %ld pages.\n", |
14047 | + (int) sysinfo.freeswap + suspend_swap_storage_allocated()); |
14048 | + |
14049 | + return len; |
14050 | +} |
14051 | + |
14052 | +/* |
14053 | + * Storage needed |
14054 | + * |
14055 | + * Returns amount of space in the swap header required |
14056 | + * for the suspend_swap's data. This ignores the links between |
14057 | + * pages, which we factor in when allocating the space. |
14058 | + * |
14059 | + * We ensure the space is allocated, but actually save the |
14060 | + * data from write_header_init and therefore don't also define a |
14061 | + * save_config_info routine. |
14062 | + */ |
14063 | +static int suspend_swap_storage_needed(void) |
14064 | +{ |
14065 | + int i, result; |
14066 | + result = sizeof(suspend_writer_posn_save) + sizeof(devinfo); |
14067 | + |
14068 | + for (i = 0; i < MAX_SWAPFILES; i++) { |
14069 | + result += 3 * sizeof(int); |
14070 | + result += (2 * sizeof(unsigned long) * |
14071 | + block_chain[i].num_extents); |
14072 | + } |
14073 | + |
14074 | + return result; |
14075 | +} |
14076 | + |
14077 | +/* |
14078 | + * Image_exists |
14079 | + */ |
14080 | +static int suspend_swap_image_exists(void) |
14081 | +{ |
14082 | + int signature_found; |
14083 | + union p_diskpage diskpage; |
14084 | + |
14085 | + if (!resume_swap_dev_t) { |
14086 | + printk("Not even trying to read header " |
14087 | + "because resume_swap_dev_t is not set.\n"); |
14088 | + return 0; |
14089 | + } |
14090 | + |
14091 | + if (!resume_block_device && |
14092 | + IS_ERR(resume_block_device = |
14093 | + open_bdev(MAX_SWAPFILES, resume_swap_dev_t, 1))) { |
14094 | + printk("Failed to open resume dev_t (%x).\n", resume_swap_dev_t); |
14095 | + return 0; |
14096 | + } |
14097 | + |
14098 | + diskpage.address = get_zeroed_page(GFP_ATOMIC); |
14099 | + |
14100 | + suspend_bio_ops.bdev_page_io(READ, resume_block_device, |
14101 | + resume_firstblock, |
14102 | + virt_to_page(diskpage.ptr)); |
14103 | + suspend_bio_ops.finish_all_io(); |
14104 | + |
14105 | + signature_found = parse_signature(diskpage.pointer->swh.magic.magic, 0); |
14106 | + free_page(diskpage.address); |
14107 | + |
14108 | + if (signature_found < 2) { |
14109 | + printk("Suspend2: Normal swapspace found.\n"); |
14110 | + return 0; /* Normal swap space */ |
14111 | + } else if (signature_found == -1) { |
14112 | + printk(KERN_ERR "Suspend2: Unable to find a signature. Could " |
14113 | + "you have moved a swap file?\n"); |
14114 | + return 0; |
14115 | + } else if (signature_found < 6) { |
14116 | + printk("Suspend2: Detected another implementation's signature.\n"); |
14117 | + return 0; |
14118 | + } else if ((signature_found >> 1) != SIGNATURE_VER) { |
14119 | + if ((!(test_suspend_state(SUSPEND_NORESUME_SPECIFIED))) && |
14120 | + suspend_early_boot_message(1, SUSPEND_CONTINUE_REQ, |
14121 | + "Found a different style suspend image signature.")) { |
14122 | + set_suspend_state(SUSPEND_NORESUME_SPECIFIED); |
14123 | + printk("Suspend2: Dectected another implementation's signature.\n"); |
14124 | + } |
14125 | + } |
14126 | + |
14127 | + return 1; |
14128 | +} |
14129 | + |
14130 | +/* |
14131 | + * Mark resume attempted. |
14132 | + * |
14133 | + * Record that we tried to resume from this image. |
14134 | + */ |
14135 | +static void suspend_swap_mark_resume_attempted(int mark) |
14136 | +{ |
14137 | + union p_diskpage diskpage; |
14138 | + int signature_found; |
14139 | + |
14140 | + if (!resume_swap_dev_t) { |
14141 | + printk("Not even trying to record attempt at resuming" |
14142 | + " because resume_swap_dev_t is not set.\n"); |
14143 | + return; |
14144 | + } |
14145 | + |
14146 | + diskpage.address = get_zeroed_page(GFP_ATOMIC); |
14147 | + |
14148 | + suspend_bio_ops.bdev_page_io(READ, resume_block_device, |
14149 | + resume_firstblock, |
14150 | + virt_to_page(diskpage.ptr)); |
14151 | + signature_found = parse_signature(diskpage.pointer->swh.magic.magic, 0); |
14152 | + |
14153 | + switch (signature_found) { |
14154 | + case 12: |
14155 | + case 13: |
14156 | + diskpage.pointer->swh.magic.magic[5] &= ~0x80; |
14157 | + if (mark) |
14158 | + diskpage.pointer->swh.magic.magic[5] |= 0x80; |
14159 | + break; |
14160 | + } |
14161 | + |
14162 | + suspend_bio_ops.bdev_page_io(WRITE, resume_block_device, |
14163 | + resume_firstblock, |
14164 | + virt_to_page(diskpage.ptr)); |
14165 | + suspend_bio_ops.finish_all_io(); |
14166 | + free_page(diskpage.address); |
14167 | + return; |
14168 | +} |
14169 | + |
14170 | +/* |
14171 | + * Parse Image Location |
14172 | + * |
14173 | + * Attempt to parse a resume2= parameter. |
14174 | + * Swap Writer accepts: |
14175 | + * resume2=swap:DEVNAME[:FIRSTBLOCK][@BLOCKSIZE] |
14176 | + * |
14177 | + * Where: |
14178 | + * DEVNAME is convertable to a dev_t by name_to_dev_t |
14179 | + * FIRSTBLOCK is the location of the first block in the swap file |
14180 | + * (specifying for a swap partition is nonsensical but not prohibited). |
14181 | + * Data is validated by attempting to read a swap header from the |
14182 | + * location given. Failure will result in suspend_swap refusing to |
14183 | + * save an image, and a reboot with correct parameters will be |
14184 | + * necessary. |
14185 | + */ |
14186 | +static int suspend_swap_parse_sig_location(char *commandline, |
14187 | + int only_allocator, int quiet) |
14188 | +{ |
14189 | + char *thischar, *devstart, *colon = NULL, *at_symbol = NULL; |
14190 | + union p_diskpage diskpage; |
14191 | + int signature_found, result = -EINVAL, temp_result; |
14192 | + |
14193 | + if (strncmp(commandline, "swap:", 5)) { |
14194 | + /* |
14195 | + * Failing swap:, we'll take a simple |
14196 | + * resume2=/dev/hda2, but fall through to |
14197 | + * other allocators if /dev/ isn't matched. |
14198 | + */ |
14199 | + if (strncmp(commandline, "/dev/", 5)) |
14200 | + return 1; |
14201 | + } else |
14202 | + commandline += 5; |
14203 | + |
14204 | + devstart = thischar = commandline; |
14205 | + while ((*thischar != ':') && (*thischar != '@') && |
14206 | + ((thischar - commandline) < 250) && (*thischar)) |
14207 | + thischar++; |
14208 | + |
14209 | + if (*thischar == ':') { |
14210 | + colon = thischar; |
14211 | + *colon = 0; |
14212 | + thischar++; |
14213 | + } |
14214 | + |
14215 | + while ((*thischar != '@') && ((thischar - commandline) < 250) && (*thischar)) |
14216 | + thischar++; |
14217 | + |
14218 | + if (*thischar == '@') { |
14219 | + at_symbol = thischar; |
14220 | + *at_symbol = 0; |
14221 | + } |
14222 | + |
14223 | + if (colon) |
14224 | + resume_firstblock = (int) simple_strtoul(colon + 1, NULL, 0); |
14225 | + else |
14226 | + resume_firstblock = 0; |
14227 | + |
14228 | + clear_suspend_state(SUSPEND_CAN_SUSPEND); |
14229 | + clear_suspend_state(SUSPEND_CAN_RESUME); |
14230 | + |
14231 | + /* Legacy */ |
14232 | + if (at_symbol) { |
14233 | + resume_blocksize = (int) simple_strtoul(at_symbol + 1, NULL, 0); |
14234 | + if (resume_blocksize & (SECTOR_SIZE - 1)) { |
14235 | + if (!quiet) |
14236 | + printk("SwapAllocator: Blocksizes are multiples" |
14237 | + "of %d!\n", SECTOR_SIZE); |
14238 | + return -EINVAL; |
14239 | + } |
14240 | + resume_firstblock = resume_firstblock * |
14241 | + (resume_blocksize / SECTOR_SIZE); |
14242 | + } |
14243 | + |
14244 | + temp_result = try_to_parse_resume_device(devstart, quiet); |
14245 | + |
14246 | + if (colon) |
14247 | + *colon = ':'; |
14248 | + if (at_symbol) |
14249 | + *at_symbol = '@'; |
14250 | + |
14251 | + if (temp_result) |
14252 | + return -EINVAL; |
14253 | + |
14254 | + diskpage.address = get_zeroed_page(GFP_ATOMIC); |
14255 | + if (!diskpage.address) { |
14256 | + printk(KERN_ERR "Suspend2: SwapAllocator: Failed to allocate " |
14257 | + "a diskpage for I/O.\n"); |
14258 | + return -ENOMEM; |
14259 | + } |
14260 | + |
14261 | + temp_result = suspend_bio_ops.bdev_page_io(READ, |
14262 | + resume_block_device, |
14263 | + resume_firstblock, |
14264 | + virt_to_page(diskpage.ptr)); |
14265 | + |
14266 | + suspend_bio_ops.finish_all_io(); |
14267 | + |
14268 | + if (temp_result) { |
14269 | + printk(KERN_ERR "Suspend2: SwapAllocator: Failed to submit " |
14270 | + "I/O.\n"); |
14271 | + goto invalid; |
14272 | + } |
14273 | + |
14274 | + signature_found = parse_signature(diskpage.pointer->swh.magic.magic, 0); |
14275 | + |
14276 | + if (signature_found != -1) { |
14277 | + if (!quiet) |
14278 | + printk("Suspend2: SwapAllocator: Signature found.\n"); |
14279 | + result = 0; |
14280 | + |
14281 | + suspend_bio_ops.set_devinfo(devinfo); |
14282 | + suspend_writer_posn.chains = &block_chain[0]; |
14283 | + suspend_writer_posn.num_chains = MAX_SWAPFILES; |
14284 | + set_suspend_state(SUSPEND_CAN_SUSPEND); |
14285 | + set_suspend_state(SUSPEND_CAN_RESUME); |
14286 | + } else |
14287 | + if (!quiet) |
14288 | + printk(KERN_ERR "Suspend2: SwapAllocator: No swap " |
14289 | + "signature found at specified location.\n"); |
14290 | +invalid: |
14291 | + free_page((unsigned long) diskpage.address); |
14292 | + return result; |
14293 | + |
14294 | +} |
14295 | + |
14296 | +static int header_locations_read_sysfs(const char *page, int count) |
14297 | +{ |
14298 | + int i, printedpartitionsmessage = 0, len = 0, haveswap = 0; |
14299 | + struct inode *swapf = 0; |
14300 | + int zone; |
14301 | + char *path_page = (char *) __get_free_page(GFP_KERNEL); |
14302 | + char *path, *output = (char *) page; |
14303 | + int path_len; |
14304 | + |
14305 | + if (!page) |
14306 | + return 0; |
14307 | + |
14308 | + for (i = 0; i < MAX_SWAPFILES; i++) { |
14309 | + struct swap_info_struct *si = get_swap_info_struct(i); |
14310 | + |
14311 | + if (!si->swap_file) |
14312 | + continue; |
14313 | + |
14314 | + if (S_ISBLK(si->swap_file->f_mapping->host->i_mode)) { |
14315 | + haveswap = 1; |
14316 | + if (!printedpartitionsmessage) { |
14317 | + len += sprintf(output + len, |
14318 | + "For swap partitions, simply use the " |
14319 | + "format: resume2=swap:/dev/hda1.\n"); |
14320 | + printedpartitionsmessage = 1; |
14321 | + } |
14322 | + } else { |
14323 | + path_len = 0; |
14324 | + |
14325 | + path = d_path(si->swap_file->f_dentry, |
14326 | + si->swap_file->f_vfsmnt, |
14327 | + path_page, |
14328 | + PAGE_SIZE); |
14329 | + path_len = snprintf(path_page, 31, "%s", path); |
14330 | + |
14331 | + haveswap = 1; |
14332 | + swapf = si->swap_file->f_mapping->host; |
14333 | + if (!(zone = bmap(swapf,0))) { |
14334 | + len+= sprintf(output + len, |
14335 | + "Swapfile %s has been corrupted. Reuse" |
14336 | + " mkswap on it and try again.\n", |
14337 | + path_page); |
14338 | + } else { |
14339 | + char name_buffer[255]; |
14340 | + len+= sprintf(output + len, "For swapfile `%s`," |
14341 | + " use resume2=swap:/dev/%s:0x%x.\n", |
14342 | + path_page, |
14343 | + bdevname(si->bdev, name_buffer), |
14344 | + zone << (swapf->i_blkbits - 9)); |
14345 | + } |
14346 | + |
14347 | + } |
14348 | + } |
14349 | + |
14350 | + if (!haveswap) |
14351 | + len = sprintf(output, "You need to turn on swap partitions " |
14352 | + "before examining this file.\n"); |
14353 | + |
14354 | + free_page((unsigned long) path_page); |
14355 | + return len; |
14356 | +} |
14357 | + |
14358 | +static struct suspend_sysfs_data sysfs_params[] = { |
14359 | + { |
14360 | + SUSPEND2_ATTR("swapfilename", SYSFS_RW), |
14361 | + SYSFS_STRING(swapfilename, 255, 0) |
14362 | + }, |
14363 | + |
14364 | + { |
14365 | + SUSPEND2_ATTR("headerlocations", SYSFS_READONLY), |
14366 | + SYSFS_CUSTOM(header_locations_read_sysfs, NULL, 0) |
14367 | + }, |
14368 | + |
14369 | + { SUSPEND2_ATTR("enabled", SYSFS_RW), |
14370 | + SYSFS_INT(&suspend_swapops.enabled, 0, 1, 0), |
14371 | + .write_side_effect = attempt_to_parse_resume_device2, |
14372 | + } |
14373 | +}; |
14374 | + |
14375 | +static struct suspend_module_ops suspend_swapops = { |
14376 | + .type = WRITER_MODULE, |
14377 | + .name = "Swap Allocator", |
14378 | + .directory = "swap", |
14379 | + .module = THIS_MODULE, |
14380 | + .memory_needed = suspend_swap_memory_needed, |
14381 | + .print_debug_info = suspend_swap_print_debug_stats, |
14382 | + .storage_needed = suspend_swap_storage_needed, |
14383 | + .initialise = suspend_swap_initialise, |
14384 | + .cleanup = suspend_swap_cleanup, |
14385 | + |
14386 | + .noresume_reset = suspend_swap_noresume_reset, |
14387 | + .storage_available = suspend_swap_storage_available, |
14388 | + .storage_allocated = suspend_swap_storage_allocated, |
14389 | + .release_storage = suspend_swap_release_storage, |
14390 | + .allocate_header_space = suspend_swap_allocate_header_space, |
14391 | + .allocate_storage = suspend_swap_allocate_storage, |
14392 | + .image_exists = suspend_swap_image_exists, |
14393 | + .mark_resume_attempted = suspend_swap_mark_resume_attempted, |
14394 | + .write_header_init = suspend_swap_write_header_init, |
14395 | + .write_header_cleanup = suspend_swap_write_header_cleanup, |
14396 | + .read_header_init = suspend_swap_read_header_init, |
14397 | + .read_header_cleanup = suspend_swap_read_header_cleanup, |
14398 | + .invalidate_image = suspend_swap_invalidate_image, |
14399 | + .parse_sig_location = suspend_swap_parse_sig_location, |
14400 | + |
14401 | + .sysfs_data = sysfs_params, |
14402 | + .num_sysfs_entries = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data), |
14403 | +}; |
14404 | + |
14405 | +/* ---- Registration ---- */ |
14406 | +static __init int suspend_swap_load(void) |
14407 | +{ |
14408 | + suspend_swapops.rw_init = suspend_bio_ops.rw_init; |
14409 | + suspend_swapops.rw_cleanup = suspend_bio_ops.rw_cleanup; |
14410 | + suspend_swapops.read_chunk = suspend_bio_ops.read_chunk; |
14411 | + suspend_swapops.write_chunk = suspend_bio_ops.write_chunk; |
14412 | + suspend_swapops.rw_header_chunk = suspend_bio_ops.rw_header_chunk; |
14413 | + |
14414 | + return suspend_register_module(&suspend_swapops); |
14415 | +} |
14416 | + |
14417 | +#ifdef MODULE |
14418 | +static __exit void suspend_swap_unload(void) |
14419 | +{ |
14420 | + suspend_unregister_module(&suspend_swapops); |
14421 | +} |
14422 | + |
14423 | +module_init(suspend_swap_load); |
14424 | +module_exit(suspend_swap_unload); |
14425 | +MODULE_LICENSE("GPL"); |
14426 | +MODULE_AUTHOR("Nigel Cunningham"); |
14427 | +MODULE_DESCRIPTION("Suspend2 SwapAllocator"); |
14428 | +#else |
14429 | +late_initcall(suspend_swap_load); |
14430 | +#endif |
14431 | diff --git a/kernel/power/suspend_userui.c b/kernel/power/suspend_userui.c |
14432 | new file mode 100644 |
14433 | index 0000000..a11cd3d |
14434 | --- /dev/null |
14435 | +++ b/kernel/power/suspend_userui.c |
14436 | @@ -0,0 +1,649 @@ |
14437 | +/* |
14438 | + * kernel/power/user_ui.c |
14439 | + * |
14440 | + * Copyright (C) 2005-2007 Bernard Blackham |
14441 | + * Copyright (C) 2002-2007 Nigel Cunningham (nigel at suspend2 net) |
14442 | + * |
14443 | + * This file is released under the GPLv2. |
14444 | + * |
14445 | + * Routines for Suspend2's user interface. |
14446 | + * |
14447 | + * The user interface code talks to a userspace program via a |
14448 | + * netlink socket. |
14449 | + * |
14450 | + * The kernel side: |
14451 | + * - starts the userui program; |
14452 | + * - sends text messages and progress bar status; |
14453 | + * |
14454 | + * The user space side: |
14455 | + * - passes messages regarding user requests (abort, toggle reboot etc) |
14456 | + * |
14457 | + */ |
14458 | + |
14459 | +#define __KERNEL_SYSCALLS__ |
14460 | + |
14461 | +#include <linux/suspend.h> |
14462 | +#include <linux/freezer.h> |
14463 | +#include <linux/console.h> |
14464 | +#include <linux/ctype.h> |
14465 | +#include <linux/tty.h> |
14466 | +#include <linux/vt_kern.h> |
14467 | +#include <linux/module.h> |
14468 | +#include <linux/reboot.h> |
14469 | +#include <linux/kmod.h> |
14470 | +#include <linux/security.h> |
14471 | +#include <linux/syscalls.h> |
14472 | + |
14473 | +#include "sysfs.h" |
14474 | +#include "modules.h" |
14475 | +#include "suspend.h" |
14476 | +#include "ui.h" |
14477 | +#include "netlink.h" |
14478 | +#include "power_off.h" |
14479 | + |
14480 | +static char local_printf_buf[1024]; /* Same as printk - should be safe */ |
14481 | + |
14482 | +static struct user_helper_data ui_helper_data; |
14483 | +static struct suspend_module_ops userui_ops; |
14484 | +static int orig_kmsg; |
14485 | + |
14486 | +static char lastheader[512]; |
14487 | +static int lastheader_message_len; |
14488 | +static int ui_helper_changed; /* Used at resume-time so don't overwrite value |
14489 | + set from initrd/ramfs. */ |
14490 | + |
14491 | +/* Number of distinct progress amounts that userspace can display */ |
14492 | +static int progress_granularity = 30; |
14493 | + |
14494 | +DECLARE_WAIT_QUEUE_HEAD(userui_wait_for_key); |
14495 | + |
14496 | +static void ui_nl_set_state(int n) |
14497 | +{ |
14498 | + /* Only let them change certain settings */ |
14499 | + static const int suspend_action_mask = |
14500 | + (1 << SUSPEND_REBOOT) | (1 << SUSPEND_PAUSE) | (1 << SUSPEND_SLOW) | |
14501 | + (1 << SUSPEND_LOGALL) | (1 << SUSPEND_SINGLESTEP) | |
14502 | + (1 << SUSPEND_PAUSE_NEAR_PAGESET_END); |
14503 | + |
14504 | + suspend_action = (suspend_action & (~suspend_action_mask)) | |
14505 | + (n & suspend_action_mask); |
14506 | + |
14507 | + if (!test_action_state(SUSPEND_PAUSE) && |
14508 | + !test_action_state(SUSPEND_SINGLESTEP)) |
14509 | + wake_up_interruptible(&userui_wait_for_key); |
14510 | +} |
14511 | + |
14512 | +static void userui_redraw(void) |
14513 | +{ |
14514 | + suspend_send_netlink_message(&ui_helper_data, |
14515 | + USERUI_MSG_REDRAW, NULL, 0); |
14516 | +} |
14517 | + |
14518 | +static int userui_storage_needed(void) |
14519 | +{ |
14520 | + return sizeof(ui_helper_data.program) + 1 + sizeof(int); |
14521 | +} |
14522 | + |
14523 | +static int userui_save_config_info(char *buf) |
14524 | +{ |
14525 | + *((int *) buf) = progress_granularity; |
14526 | + memcpy(buf + sizeof(int), ui_helper_data.program, sizeof(ui_helper_data.program)); |
14527 | + return sizeof(ui_helper_data.program) + sizeof(int) + 1; |
14528 | +} |
14529 | + |
14530 | +static void userui_load_config_info(char *buf, int size) |
14531 | +{ |
14532 | + progress_granularity = *((int *) buf); |
14533 | + size -= sizeof(int); |
14534 | + |
14535 | + /* Don't load the saved path if one has already been set */ |
14536 | + if (ui_helper_changed) |
14537 | + return; |
14538 | + |
14539 | + if (size > sizeof(ui_helper_data.program)) |
14540 | + size = sizeof(ui_helper_data.program); |
14541 | + |
14542 | + memcpy(ui_helper_data.program, buf + sizeof(int), size); |
14543 | + ui_helper_data.program[sizeof(ui_helper_data.program)-1] = '\0'; |
14544 | +} |
14545 | + |
14546 | +static void set_ui_program_set(void) |
14547 | +{ |
14548 | + ui_helper_changed = 1; |
14549 | +} |
14550 | + |
14551 | +static int userui_memory_needed(void) |
14552 | +{ |
14553 | + /* ball park figure of 128 pages */ |
14554 | + return (128 * PAGE_SIZE); |
14555 | +} |
14556 | + |
14557 | +/* suspend_update_status |
14558 | + * |
14559 | + * Description: Update the progress bar and (if on) in-bar message. |
14560 | + * Arguments: UL value, maximum: Current progress percentage (value/max). |
14561 | + * const char *fmt, ...: Message to be displayed in the middle |
14562 | + * of the progress bar. |
14563 | + * Note that a NULL message does not mean that any previous |
14564 | + * message is erased! For that, you need suspend_prepare_status with |
14565 | + * clearbar on. |
14566 | + * Returns: Unsigned long: The next value where status needs to be updated. |
14567 | + * This is to reduce unnecessary calls to update_status. |
14568 | + */ |
14569 | +static unsigned long userui_update_status(unsigned long value, |
14570 | + unsigned long maximum, const char *fmt, ...) |
14571 | +{ |
14572 | + static int last_step = -1; |
14573 | + struct userui_msg_params msg; |
14574 | + int bitshift; |
14575 | + int this_step; |
14576 | + unsigned long next_update; |
14577 | + |
14578 | + if (ui_helper_data.pid == -1) |
14579 | + return 0; |
14580 | + |
14581 | + if ((!maximum) || (!progress_granularity)) |
14582 | + return maximum; |
14583 | + |
14584 | + if (value < 0) |
14585 | + value = 0; |
14586 | + |
14587 | + if (value > maximum) |
14588 | + value = maximum; |
14589 | + |
14590 | + /* Try to avoid math problems - we can't do 64 bit math here |
14591 | + * (and shouldn't need it - anyone got screen resolution |
14592 | + * of 65536 pixels or more?) */ |
14593 | + bitshift = fls(maximum) - 16; |
14594 | + if (bitshift > 0) { |
14595 | + unsigned long temp_maximum = maximum >> bitshift; |
14596 | + unsigned long temp_value = value >> bitshift; |
14597 | + this_step = (int) |
14598 | + (temp_value * progress_granularity / temp_maximum); |
14599 | + next_update = (((this_step + 1) * temp_maximum / |
14600 | + progress_granularity) + 1) << bitshift; |
14601 | + } else { |
14602 | + this_step = (int) (value * progress_granularity / maximum); |
14603 | + next_update = ((this_step + 1) * maximum / |
14604 | + progress_granularity) + 1; |
14605 | + } |
14606 | + |
14607 | + if (this_step == last_step) |
14608 | + return next_update; |
14609 | + |
14610 | + memset(&msg, 0, sizeof(msg)); |
14611 | + |
14612 | + msg.a = this_step; |
14613 | + msg.b = progress_granularity; |
14614 | + |
14615 | + if (fmt) { |
14616 | + va_list args; |
14617 | + va_start(args, fmt); |
14618 | + vsnprintf(msg.text, sizeof(msg.text), fmt, args); |
14619 | + va_end(args); |
14620 | + msg.text[sizeof(msg.text)-1] = '\0'; |
14621 | + } |
14622 | + |
14623 | + suspend_send_netlink_message(&ui_helper_data, USERUI_MSG_PROGRESS, |
14624 | + &msg, sizeof(msg)); |
14625 | + last_step = this_step; |
14626 | + |
14627 | + return next_update; |
14628 | +} |
14629 | + |
14630 | +/* userui_message. |
14631 | + * |
14632 | + * Description: This function is intended to do the same job as printk, but |
14633 | + * without normally logging what is printed. The point is to be |
14634 | + * able to get debugging info on screen without filling the logs |
14635 | + * with "1/534. ^M 2/534^M. 3/534^M" |
14636 | + * |
14637 | + * It may be called from an interrupt context - can't sleep! |
14638 | + * |
14639 | + * Arguments: int mask: The debugging section(s) this message belongs to. |
14640 | + * int level: The level of verbosity of this message. |
14641 | + * int restartline: Whether to output a \r or \n with this line |
14642 | + * (\n if we're logging all output). |
14643 | + * const char *fmt, ...: Message to be displayed a la printk. |
14644 | + */ |
14645 | +static void userui_message(unsigned long section, unsigned long level, |
14646 | + int normally_logged, const char *fmt, ...) |
14647 | +{ |
14648 | + struct userui_msg_params msg; |
14649 | + |
14650 | + if ((level) && (level > console_loglevel)) |
14651 | + return; |
14652 | + |
14653 | + memset(&msg, 0, sizeof(msg)); |
14654 | + |
14655 | + msg.a = section; |
14656 | + msg.b = level; |
14657 | + msg.c = normally_logged; |
14658 | + |
14659 | + if (fmt) { |
14660 | + va_list args; |
14661 | + va_start(args, fmt); |
14662 | + vsnprintf(msg.text, sizeof(msg.text), fmt, args); |
14663 | + va_end(args); |
14664 | + msg.text[sizeof(msg.text)-1] = '\0'; |
14665 | + } |
14666 | + |
14667 | + if (test_action_state(SUSPEND_LOGALL)) |
14668 | + printk("%s\n", msg.text); |
14669 | + |
14670 | + suspend_send_netlink_message(&ui_helper_data, USERUI_MSG_MESSAGE, |
14671 | + &msg, sizeof(msg)); |
14672 | +} |
14673 | + |
14674 | +static void wait_for_key_via_userui(void) |
14675 | +{ |
14676 | + DECLARE_WAITQUEUE(wait, current); |
14677 | + |
14678 | + add_wait_queue(&userui_wait_for_key, &wait); |
14679 | + set_current_state(TASK_INTERRUPTIBLE); |
14680 | + |
14681 | + interruptible_sleep_on(&userui_wait_for_key); |
14682 | + |
14683 | + set_current_state(TASK_RUNNING); |
14684 | + remove_wait_queue(&userui_wait_for_key, &wait); |
14685 | +} |
14686 | + |
14687 | +static char userui_wait_for_keypress(int timeout) |
14688 | +{ |
14689 | + int fd; |
14690 | + char key = '\0'; |
14691 | + struct termios t, t_backup; |
14692 | + |
14693 | + if (ui_helper_data.pid != -1) { |
14694 | + wait_for_key_via_userui(); |
14695 | + key = ' '; |
14696 | + goto out; |
14697 | + } |
14698 | + |
14699 | + /* We should be guaranteed /dev/console exists after populate_rootfs() in |
14700 | + * init/main.c |
14701 | + */ |
14702 | + if ((fd = sys_open("/dev/console", O_RDONLY, 0)) < 0) { |
14703 | + printk("Couldn't open /dev/console.\n"); |
14704 | + goto out; |
14705 | + } |
14706 | + |
14707 | + if (sys_ioctl(fd, TCGETS, (long)&t) < 0) |
14708 | + goto out_close; |
14709 | + |
14710 | + memcpy(&t_backup, &t, sizeof(t)); |
14711 | + |
14712 | + t.c_lflag &= ~(ISIG|ICANON|ECHO); |
14713 | + t.c_cc[VMIN] = 0; |
14714 | + if (timeout) |
14715 | + t.c_cc[VTIME] = timeout*10; |
14716 | + |
14717 | + if (sys_ioctl(fd, TCSETS, (long)&t) < 0) |
14718 | + goto out_restore; |
14719 | + |
14720 | + while (1) { |
14721 | + if (sys_read(fd, &key, 1) <= 0) { |
14722 | + key = '\0'; |
14723 | + break; |
14724 | + } |
14725 | + key = tolower(key); |
14726 | + if (test_suspend_state(SUSPEND_SANITY_CHECK_PROMPT)) { |
14727 | + if (key == 'c') { |
14728 | + set_suspend_state(SUSPEND_CONTINUE_REQ); |
14729 | + break; |
14730 | + } else if (key == ' ') |
14731 | + break; |
14732 | + } else |
14733 | + break; |
14734 | + } |
14735 | + |
14736 | +out_restore: |
14737 | + sys_ioctl(fd, TCSETS, (long)&t_backup); |
14738 | +out_close: |
14739 | + sys_close(fd); |
14740 | +out: |
14741 | + return key; |
14742 | +} |
14743 | + |
14744 | +/* suspend_prepare_status |
14745 | + * Description: Prepare the 'nice display', drawing the header and version, |
14746 | + * along with the current action and perhaps also resetting the |
14747 | + * progress bar. |
14748 | + * Arguments: |
14749 | + * int clearbar: Whether to reset the progress bar. |
14750 | + * const char *fmt, ...: The action to be displayed. |
14751 | + */ |
14752 | +static void userui_prepare_status(int clearbar, const char *fmt, ...) |
14753 | +{ |
14754 | + va_list args; |
14755 | + |
14756 | + if (fmt) { |
14757 | + va_start(args, fmt); |
14758 | + lastheader_message_len = vsnprintf(lastheader, 512, fmt, args); |
14759 | + va_end(args); |
14760 | + } |
14761 | + |
14762 | + if (clearbar) |
14763 | + suspend_update_status(0, 1, NULL); |
14764 | + |
14765 | + suspend_message(0, SUSPEND_STATUS, 1, lastheader, NULL); |
14766 | + |
14767 | + if (ui_helper_data.pid == -1) |
14768 | + printk(KERN_EMERG "%s\n", lastheader); |
14769 | +} |
14770 | + |
14771 | +/* abort_suspend |
14772 | + * |
14773 | + * Description: Begin to abort a cycle. If this wasn't at the user's request |
14774 | + * (and we're displaying output), tell the user why and wait for |
14775 | + * them to acknowledge the message. |
14776 | + * Arguments: A parameterised string (imagine this is printk) to display, |
14777 | + * telling the user why we're aborting. |
14778 | + */ |
14779 | + |
14780 | +static void userui_abort_suspend(int result_code, const char *fmt, ...) |
14781 | +{ |
14782 | + va_list args; |
14783 | + int printed_len = 0; |
14784 | + |
14785 | + set_result_state(result_code); |
14786 | + if (!test_result_state(SUSPEND_ABORTED)) { |
14787 | + if (!test_result_state(SUSPEND_ABORT_REQUESTED)) { |
14788 | + va_start(args, fmt); |
14789 | + printed_len = vsnprintf(local_printf_buf, |
14790 | + sizeof(local_printf_buf), fmt, args); |
14791 | + va_end(args); |
14792 | + if (ui_helper_data.pid != -1) |
14793 | + printed_len = sprintf(local_printf_buf + printed_len, |
14794 | + " (Press SPACE to continue)"); |
14795 | + suspend_prepare_status(CLEAR_BAR, local_printf_buf); |
14796 | + |
14797 | + if (ui_helper_data.pid != -1) |
14798 | + suspend_wait_for_keypress(0); |
14799 | + } |
14800 | + /* Turn on aborting flag */ |
14801 | + set_result_state(SUSPEND_ABORTED); |
14802 | + } |
14803 | +} |
14804 | + |
14805 | +/* request_abort_suspend |
14806 | + * |
14807 | + * Description: Handle the user requesting the cancellation of a suspend by |
14808 | + * pressing escape. |
14809 | + * Callers: Invoked from a netlink packet from userspace when the user presses |
14810 | + * escape. |
14811 | + */ |
14812 | +static void request_abort_suspend(void) |
14813 | +{ |
14814 | + if (test_result_state(SUSPEND_ABORT_REQUESTED)) |
14815 | + return; |
14816 | + |
14817 | + if (test_suspend_state(SUSPEND_NOW_RESUMING)) { |
14818 | + suspend_prepare_status(CLEAR_BAR, "Escape pressed. " |
14819 | + "Powering down again."); |
14820 | + set_suspend_state(SUSPEND_STOP_RESUME); |
14821 | + while (!test_suspend_state(SUSPEND_IO_STOPPED)) |
14822 | + schedule(); |
14823 | + if (suspendActiveAllocator->mark_resume_attempted) |
14824 | + suspendActiveAllocator->mark_resume_attempted(0); |
14825 | + suspend2_power_down(); |
14826 | + } else { |
14827 | + suspend_prepare_status(CLEAR_BAR, "--- ESCAPE PRESSED :" |
14828 | + " ABORTING SUSPEND ---"); |
14829 | + set_result_state(SUSPEND_ABORTED); |
14830 | + set_result_state(SUSPEND_ABORT_REQUESTED); |
14831 | + |
14832 | + wake_up_interruptible(&userui_wait_for_key); |
14833 | + } |
14834 | +} |
14835 | + |
14836 | +static int userui_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
14837 | +{ |
14838 | + int type; |
14839 | + int *data; |
14840 | + |
14841 | + type = nlh->nlmsg_type; |
14842 | + |
14843 | + /* A control message: ignore them */ |
14844 | + if (type < NETLINK_MSG_BASE) |
14845 | + return 0; |
14846 | + |
14847 | + /* Unknown message: reply with EINVAL */ |
14848 | + if (type >= USERUI_MSG_MAX) |
14849 | + return -EINVAL; |
14850 | + |
14851 | + /* All operations require privileges, even GET */ |
14852 | + if (security_netlink_recv(skb, CAP_NET_ADMIN)) |
14853 | + return -EPERM; |
14854 | + |
14855 | + /* Only allow one task to receive NOFREEZE privileges */ |
14856 | + if (type == NETLINK_MSG_NOFREEZE_ME && ui_helper_data.pid != -1) { |
14857 | + printk("Got NOFREEZE_ME request when ui_helper_data.pid is %d.\n", ui_helper_data.pid); |
14858 | + return -EBUSY; |
14859 | + } |
14860 | + |
14861 | + data = (int*)NLMSG_DATA(nlh); |
14862 | + |
14863 | + switch (type) { |
14864 | + case USERUI_MSG_ABORT: |
14865 | + request_abort_suspend(); |
14866 | + break; |
14867 | + case USERUI_MSG_GET_STATE: |
14868 | + suspend_send_netlink_message(&ui_helper_data, |
14869 | + USERUI_MSG_GET_STATE, &suspend_action, |
14870 | + sizeof(suspend_action)); |
14871 | + break; |
14872 | + case USERUI_MSG_GET_DEBUG_STATE: |
14873 | + suspend_send_netlink_message(&ui_helper_data, |
14874 | + USERUI_MSG_GET_DEBUG_STATE, |
14875 | + &suspend_debug_state, |
14876 | + sizeof(suspend_debug_state)); |
14877 | + break; |
14878 | + case USERUI_MSG_SET_STATE: |
14879 | + if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int))) |
14880 | + return -EINVAL; |
14881 | + ui_nl_set_state(*data); |
14882 | + break; |
14883 | + case USERUI_MSG_SET_DEBUG_STATE: |
14884 | + if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int))) |
14885 | + return -EINVAL; |
14886 | + suspend_debug_state = (*data); |
14887 | + break; |
14888 | + case USERUI_MSG_SPACE: |
14889 | + wake_up_interruptible(&userui_wait_for_key); |
14890 | + break; |
14891 | + case USERUI_MSG_GET_POWERDOWN_METHOD: |
14892 | + suspend_send_netlink_message(&ui_helper_data, |
14893 | + USERUI_MSG_GET_POWERDOWN_METHOD, |
14894 | + &suspend2_poweroff_method, |
14895 | + sizeof(suspend2_poweroff_method)); |
14896 | + break; |
14897 | + case USERUI_MSG_SET_POWERDOWN_METHOD: |
14898 | + if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int))) |
14899 | + return -EINVAL; |
14900 | + suspend2_poweroff_method = (*data); |
14901 | + break; |
14902 | + case USERUI_MSG_GET_LOGLEVEL: |
14903 | + suspend_send_netlink_message(&ui_helper_data, |
14904 | + USERUI_MSG_GET_LOGLEVEL, |
14905 | + &suspend_default_console_level, |
14906 | + sizeof(suspend_default_console_level)); |
14907 | + break; |
14908 | + case USERUI_MSG_SET_LOGLEVEL: |
14909 | + if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int))) |
14910 | + return -EINVAL; |
14911 | + suspend_default_console_level = (*data); |
14912 | + break; |
14913 | + } |
14914 | + |
14915 | + return 1; |
14916 | +} |
14917 | + |
14918 | +/* userui_cond_pause |
14919 | + * |
14920 | + * Description: Potentially pause and wait for the user to tell us to continue. |
14921 | + * We normally only pause when @pause is set. |
14922 | + * Arguments: int pause: Whether we normally pause. |
14923 | + * char *message: The message to display. Not parameterised |
14924 | + * because it's normally a constant. |
14925 | + */ |
14926 | + |
14927 | +static void userui_cond_pause(int pause, char *message) |
14928 | +{ |
14929 | + int displayed_message = 0, last_key = 0; |
14930 | + |
14931 | + while (last_key != 32 && |
14932 | + ui_helper_data.pid != -1 && |
14933 | + (!test_result_state(SUSPEND_ABORTED)) && |
14934 | + ((test_action_state(SUSPEND_PAUSE) && pause) || |
14935 | + (test_action_state(SUSPEND_SINGLESTEP)))) { |
14936 | + if (!displayed_message) { |
14937 | + suspend_prepare_status(DONT_CLEAR_BAR, |
14938 | + "%s Press SPACE to continue.%s", |
14939 | + message ? message : "", |
14940 | + (test_action_state(SUSPEND_SINGLESTEP)) ? |
14941 | + " Single step on." : ""); |
14942 | + displayed_message = 1; |
14943 | + } |
14944 | + last_key = suspend_wait_for_keypress(0); |
14945 | + } |
14946 | + schedule(); |
14947 | +} |
14948 | + |
14949 | +/* userui_prepare_console |
14950 | + * |
14951 | + * Description: Prepare a console for use, save current settings. |
14952 | + * Returns: Boolean: Whether an error occured. Errors aren't |
14953 | + * treated as fatal, but a warning is printed. |
14954 | + */ |
14955 | +static void userui_prepare_console(void) |
14956 | +{ |
14957 | + orig_kmsg = kmsg_redirect; |
14958 | + kmsg_redirect = fg_console + 1; |
14959 | + |
14960 | + ui_helper_data.pid = -1; |
14961 | + |
14962 | + if (!userui_ops.enabled) |
14963 | + return; |
14964 | + |
14965 | + if (!*ui_helper_data.program) { |
14966 | + printk("suspend_userui: program not configured. suspend_userui disabled.\n"); |
14967 | + return; |
14968 | + } |
14969 | + |
14970 | + suspend_netlink_setup(&ui_helper_data); |
14971 | + |
14972 | + return; |
14973 | +} |
14974 | + |
14975 | +/* userui_cleanup_console |
14976 | + * |
14977 | + * Description: Restore the settings we saved above. |
14978 | + */ |
14979 | + |
14980 | +static void userui_cleanup_console(void) |
14981 | +{ |
14982 | + if (ui_helper_data.pid > -1) |
14983 | + suspend_netlink_close(&ui_helper_data); |
14984 | + |
14985 | + kmsg_redirect = orig_kmsg; |
14986 | +} |
14987 | + |
14988 | +/* |
14989 | + * User interface specific /sys/power/suspend2 entries. |
14990 | + */ |
14991 | + |
14992 | +static struct suspend_sysfs_data sysfs_params[] = { |
14993 | +#if defined(CONFIG_NET) && defined(CONFIG_SYSFS) |
14994 | + { SUSPEND2_ATTR("enable_escape", SYSFS_RW), |
14995 | + SYSFS_BIT(&suspend_action, SUSPEND_CAN_CANCEL, 0) |
14996 | + }, |
14997 | + |
14998 | + { SUSPEND2_ATTR("pause_between_steps", SYSFS_RW), |
14999 | + SYSFS_BIT(&suspend_action, SUSPEND_PAUSE, 0) |
15000 | + }, |
15001 | + |
15002 | + { SUSPEND2_ATTR("enabled", SYSFS_RW), |
15003 | + SYSFS_INT(&userui_ops.enabled, 0, 1, 0) |
15004 | + }, |
15005 | + |
15006 | + { SUSPEND2_ATTR("progress_granularity", SYSFS_RW), |
15007 | + SYSFS_INT(&progress_granularity, 1, 2048, 0) |
15008 | + }, |
15009 | + |
15010 | + { SUSPEND2_ATTR("program", SYSFS_RW), |
15011 | + SYSFS_STRING(ui_helper_data.program, 255, 0), |
15012 | + .write_side_effect = set_ui_program_set, |
15013 | + }, |
15014 | +#endif |
15015 | +}; |
15016 | + |
15017 | +static struct suspend_module_ops userui_ops = { |
15018 | + .type = MISC_MODULE, |
15019 | + .name = "Userspace UI", |
15020 | + .shared_directory = "Basic User Interface", |
15021 | + .module = THIS_MODULE, |
15022 | + .storage_needed = userui_storage_needed, |
15023 | + .save_config_info = userui_save_config_info, |
15024 | + .load_config_info = userui_load_config_info, |
15025 | + .memory_needed = userui_memory_needed, |
15026 | + .sysfs_data = sysfs_params, |
15027 | + .num_sysfs_entries = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data), |
15028 | +}; |
15029 | + |
15030 | +static struct ui_ops my_ui_ops = { |
15031 | + .redraw = userui_redraw, |
15032 | + .update_status = userui_update_status, |
15033 | + .message = userui_message, |
15034 | + .prepare_status = userui_prepare_status, |
15035 | + .abort = userui_abort_suspend, |
15036 | + .cond_pause = userui_cond_pause, |
15037 | + .prepare = userui_prepare_console, |
15038 | + .cleanup = userui_cleanup_console, |
15039 | + .wait_for_key = userui_wait_for_keypress, |
15040 | +}; |
15041 | + |
15042 | +/* suspend_console_sysfs_init |
15043 | + * Description: Boot time initialisation for user interface. |
15044 | + */ |
15045 | + |
15046 | +static __init int s2_user_ui_init(void) |
15047 | +{ |
15048 | + int result; |
15049 | + |
15050 | + ui_helper_data.nl = NULL; |
15051 | + ui_helper_data.program[0] = '\0'; |
15052 | + ui_helper_data.pid = -1; |
15053 | + ui_helper_data.skb_size = sizeof(struct userui_msg_params); |
15054 | + ui_helper_data.pool_limit = 6; |
15055 | + ui_helper_data.netlink_id = NETLINK_SUSPEND2_USERUI; |
15056 | + ui_helper_data.name = "userspace ui"; |
15057 | + ui_helper_data.rcv_msg = userui_user_rcv_msg; |
15058 | + ui_helper_data.interface_version = 7; |
15059 | + ui_helper_data.must_init = 0; |
15060 | + ui_helper_data.not_ready = userui_cleanup_console; |
15061 | + init_completion(&ui_helper_data.wait_for_process); |
15062 | + result = suspend_register_module(&userui_ops); |
15063 | + if (!result) |
15064 | + result = s2_register_ui_ops(&my_ui_ops); |
15065 | + if (result) |
15066 | + suspend_unregister_module(&userui_ops); |
15067 | + |
15068 | + return result; |
15069 | +} |
15070 | + |
15071 | +#ifdef MODULE |
15072 | +static __exit void s2_user_ui_exit(void) |
15073 | +{ |
15074 | + s2_remove_ui_ops(&my_ui_ops); |
15075 | + suspend_unregister_module(&userui_ops); |
15076 | +} |
15077 | + |
15078 | +module_init(s2_user_ui_init); |
15079 | +module_exit(s2_user_ui_exit); |
15080 | +MODULE_AUTHOR("Nigel Cunningham"); |
15081 | +MODULE_DESCRIPTION("Suspend2 Userui Support"); |
15082 | +MODULE_LICENSE("GPL"); |
15083 | +#else |
15084 | +late_initcall(s2_user_ui_init); |
15085 | +#endif |
15086 | diff --git a/kernel/power/sysfs.c b/kernel/power/sysfs.c |
15087 | new file mode 100644 |
15088 | index 0000000..47eca3b |
15089 | --- /dev/null |
15090 | +++ b/kernel/power/sysfs.c |
15091 | @@ -0,0 +1,347 @@ |
15092 | +/* |
15093 | + * kernel/power/sysfs.c |
15094 | + * |
15095 | + * Copyright (C) 2002-2007 Nigel Cunningham (nigel at suspend2 net) |
15096 | + * |
15097 | + * This file is released under the GPLv2. |
15098 | + * |
15099 | + * This file contains support for sysfs entries for tuning Suspend2. |
15100 | + * |
15101 | + * We have a generic handler that deals with the most common cases, and |
15102 | + * hooks for special handlers to use. |
15103 | + */ |
15104 | + |
15105 | +#include <linux/suspend.h> |
15106 | +#include <linux/module.h> |
15107 | +#include <asm/uaccess.h> |
15108 | + |
15109 | +#include "sysfs.h" |
15110 | +#include "suspend.h" |
15111 | +#include "storage.h" |
15112 | + |
15113 | +static int suspend_sysfs_initialised = 0; |
15114 | + |
15115 | +static void suspend_initialise_sysfs(void); |
15116 | + |
15117 | +static struct suspend_sysfs_data sysfs_params[]; |
15118 | + |
15119 | +#define to_sysfs_data(_attr) container_of(_attr, struct suspend_sysfs_data, attr) |
15120 | + |
15121 | +static void suspend2_main_wrapper(void) |
15122 | +{ |
15123 | + _suspend2_try_suspend(0); |
15124 | +} |
15125 | + |
15126 | +static ssize_t suspend2_attr_show(struct kobject *kobj, struct attribute *attr, |
15127 | + char *page) |
15128 | +{ |
15129 | + struct suspend_sysfs_data *sysfs_data = to_sysfs_data(attr); |
15130 | + int len = 0; |
15131 | + |
15132 | + if (suspend_start_anything(0)) |
15133 | + return -EBUSY; |
15134 | + |
15135 | + if (sysfs_data->flags & SYSFS_NEEDS_SM_FOR_READ) |
15136 | + suspend_prepare_usm(); |
15137 | + |
15138 | + switch (sysfs_data->type) { |
15139 | + case SUSPEND_SYSFS_DATA_CUSTOM: |
15140 | + len = (sysfs_data->data.special.read_sysfs) ? |
15141 | + (sysfs_data->data.special.read_sysfs)(page, PAGE_SIZE) |
15142 | + : 0; |
15143 | + break; |
15144 | + case SUSPEND_SYSFS_DATA_BIT: |
15145 | + len = sprintf(page, "%d\n", |
15146 | + -test_bit(sysfs_data->data.bit.bit, |
15147 | + sysfs_data->data.bit.bit_vector)); |
15148 | + break; |
15149 | + case SUSPEND_SYSFS_DATA_INTEGER: |
15150 | + len = sprintf(page, "%d\n", |
15151 | + *(sysfs_data->data.integer.variable)); |
15152 | + break; |
15153 | + case SUSPEND_SYSFS_DATA_LONG: |
15154 | + len = sprintf(page, "%ld\n", |
15155 | + *(sysfs_data->data.a_long.variable)); |
15156 | + break; |
15157 | + case SUSPEND_SYSFS_DATA_UL: |
15158 | + len = sprintf(page, "%lu\n", |
15159 | + *(sysfs_data->data.ul.variable)); |
15160 | + break; |
15161 | + case SUSPEND_SYSFS_DATA_STRING: |
15162 | + len = sprintf(page, "%s\n", |
15163 | + sysfs_data->data.string.variable); |
15164 | + break; |
15165 | + } |
15166 | + /* Side effect routine? */ |
15167 | + if (sysfs_data->read_side_effect) |
15168 | + sysfs_data->read_side_effect(); |
15169 | + |
15170 | + if (sysfs_data->flags & SYSFS_NEEDS_SM_FOR_READ) |
15171 | + suspend_cleanup_usm(); |
15172 | + |
15173 | + suspend_finish_anything(0); |
15174 | + |
15175 | + return len; |
15176 | +} |
15177 | + |
15178 | +#define BOUND(_variable, _type) \ |
15179 | + if (*_variable < sysfs_data->data._type.minimum) \ |
15180 | + *_variable = sysfs_data->data._type.minimum; \ |
15181 | + else if (*_variable > sysfs_data->data._type.maximum) \ |
15182 | + *_variable = sysfs_data->data._type.maximum; |
15183 | + |
15184 | +static ssize_t suspend2_attr_store(struct kobject *kobj, struct attribute *attr, |
15185 | + const char *my_buf, size_t count) |
15186 | +{ |
15187 | + int assigned_temp_buffer = 0, result = count; |
15188 | + struct suspend_sysfs_data *sysfs_data = to_sysfs_data(attr); |
15189 | + |
15190 | + if (suspend_start_anything((sysfs_data->flags & SYSFS_SUSPEND_OR_RESUME))) |
15191 | + return -EBUSY; |
15192 | + |
15193 | + ((char *) my_buf)[count] = 0; |
15194 | + |
15195 | + if (sysfs_data->flags & SYSFS_NEEDS_SM_FOR_WRITE) |
15196 | + suspend_prepare_usm(); |
15197 | + |
15198 | + switch (sysfs_data->type) { |
15199 | + case SUSPEND_SYSFS_DATA_CUSTOM: |
15200 | + if (sysfs_data->data.special.write_sysfs) |
15201 | + result = (sysfs_data->data.special.write_sysfs) |
15202 | + (my_buf, count); |
15203 | + break; |
15204 | + case SUSPEND_SYSFS_DATA_BIT: |
15205 | + { |
15206 | + int value = simple_strtoul(my_buf, NULL, 0); |
15207 | + if (value) |
15208 | + set_bit(sysfs_data->data.bit.bit, |
15209 | + (sysfs_data->data.bit.bit_vector)); |
15210 | + else |
15211 | + clear_bit(sysfs_data->data.bit.bit, |
15212 | + (sysfs_data->data.bit.bit_vector)); |
15213 | + } |
15214 | + break; |
15215 | + case SUSPEND_SYSFS_DATA_INTEGER: |
15216 | + { |
15217 | + int *variable = sysfs_data->data.integer.variable; |
15218 | + *variable = simple_strtol(my_buf, NULL, 0); |
15219 | + BOUND(variable, integer); |
15220 | + break; |
15221 | + } |
15222 | + case SUSPEND_SYSFS_DATA_LONG: |
15223 | + { |
15224 | + long *variable = sysfs_data->data.a_long.variable; |
15225 | + *variable = simple_strtol(my_buf, NULL, 0); |
15226 | + BOUND(variable, a_long); |
15227 | + break; |
15228 | + } |
15229 | + case SUSPEND_SYSFS_DATA_UL: |
15230 | + { |
15231 | + unsigned long *variable = sysfs_data->data.ul.variable; |
15232 | + *variable = simple_strtoul(my_buf, NULL, 0); |
15233 | + BOUND(variable, ul); |
15234 | + break; |
15235 | + } |
15236 | + break; |
15237 | + case SUSPEND_SYSFS_DATA_STRING: |
15238 | + { |
15239 | + int copy_len = count; |
15240 | + char *variable = |
15241 | + sysfs_data->data.string.variable; |
15242 | + |
15243 | + if (sysfs_data->data.string.max_length && |
15244 | + (copy_len > sysfs_data->data.string.max_length)) |
15245 | + copy_len = sysfs_data->data.string.max_length; |
15246 | + |
15247 | + if (!variable) { |
15248 | + sysfs_data->data.string.variable = |
15249 | + variable = (char *) get_zeroed_page(GFP_ATOMIC); |
15250 | + assigned_temp_buffer = 1; |
15251 | + } |
15252 | + strncpy(variable, my_buf, copy_len); |
15253 | + if ((copy_len) && |
15254 | + (my_buf[copy_len - 1] == '\n')) |
15255 | + variable[count - 1] = 0; |
15256 | + variable[count] = 0; |
15257 | + } |
15258 | + break; |
15259 | + } |
15260 | + |
15261 | + /* Side effect routine? */ |
15262 | + if (sysfs_data->write_side_effect) |
15263 | + sysfs_data->write_side_effect(); |
15264 | + |
15265 | + /* Free temporary buffers */ |
15266 | + if (assigned_temp_buffer) { |
15267 | + free_page((unsigned long) sysfs_data->data.string.variable); |
15268 | + sysfs_data->data.string.variable = NULL; |
15269 | + } |
15270 | + |
15271 | + if (sysfs_data->flags & SYSFS_NEEDS_SM_FOR_WRITE) |
15272 | + suspend_cleanup_usm(); |
15273 | + |
15274 | + suspend_finish_anything(sysfs_data->flags & SYSFS_SUSPEND_OR_RESUME); |
15275 | + |
15276 | + return result; |
15277 | +} |
15278 | + |
15279 | +static struct sysfs_ops suspend2_sysfs_ops = { |
15280 | + .show = &suspend2_attr_show, |
15281 | + .store = &suspend2_attr_store, |
15282 | +}; |
15283 | + |
15284 | +static struct kobj_type suspend2_ktype = { |
15285 | + .sysfs_ops = &suspend2_sysfs_ops, |
15286 | +}; |
15287 | + |
15288 | +decl_subsys(suspend2, &suspend2_ktype, NULL); |
15289 | + |
15290 | +/* Non-module sysfs entries. |
15291 | + * |
15292 | + * This array contains entries that are automatically registered at |
15293 | + * boot. Modules and the console code register their own entries separately. |
15294 | + * |
15295 | + * NB: If you move do_suspend, change suspend_write_sysfs's test so that |
15296 | + * suspend_start_anything still gets a 1 when the user echos > do_suspend! |
15297 | + */ |
15298 | + |
15299 | +static struct suspend_sysfs_data sysfs_params[] = { |
15300 | + { SUSPEND2_ATTR("do_suspend", SYSFS_WRITEONLY), |
15301 | + SYSFS_CUSTOM(NULL, NULL, SYSFS_SUSPENDING), |
15302 | + .write_side_effect = suspend2_main_wrapper |
15303 | + }, |
15304 | + |
15305 | + { SUSPEND2_ATTR("do_resume", SYSFS_WRITEONLY), |
15306 | + SYSFS_CUSTOM(NULL, NULL, SYSFS_RESUMING), |
15307 | + .write_side_effect = __suspend2_try_resume |
15308 | + }, |
15309 | + |
15310 | +}; |
15311 | + |
15312 | +void remove_suspend2_sysdir(struct kobject *kobj) |
15313 | +{ |
15314 | + if (!kobj) |
15315 | + return; |
15316 | + |
15317 | + kobject_unregister(kobj); |
15318 | + |
15319 | + kfree(kobj); |
15320 | +} |
15321 | + |
15322 | +struct kobject *make_suspend2_sysdir(char *name) |
15323 | +{ |
15324 | + struct kobject *kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL); |
15325 | + int err; |
15326 | + |
15327 | + if(!kobj) { |
15328 | + printk("Suspend2: Can't allocate kobject for sysfs dir!\n"); |
15329 | + return NULL; |
15330 | + } |
15331 | + |
15332 | + err = kobject_set_name(kobj, "%s", name); |
15333 | + |
15334 | + if (err) { |
15335 | + kfree(kobj); |
15336 | + return NULL; |
15337 | + } |
15338 | + |
15339 | + kobj->kset = &suspend2_subsys.kset; |
15340 | + |
15341 | + err = kobject_register(kobj); |
15342 | + |
15343 | + if (err) |
15344 | + kfree(kobj); |
15345 | + |
15346 | + return err ? NULL : kobj; |
15347 | +} |
15348 | + |
15349 | +/* suspend_register_sysfs_file |
15350 | + * |
15351 | + * Helper for registering a new /sysfs/suspend2 entry. |
15352 | + */ |
15353 | + |
15354 | +int suspend_register_sysfs_file( |
15355 | + struct kobject *kobj, |
15356 | + struct suspend_sysfs_data *suspend_sysfs_data) |
15357 | +{ |
15358 | + int result; |
15359 | + |
15360 | + if (!suspend_sysfs_initialised) |
15361 | + suspend_initialise_sysfs(); |
15362 | + |
15363 | + if ((result = sysfs_create_file(kobj, &suspend_sysfs_data->attr))) |
15364 | + printk("Suspend2: sysfs_create_file for %s returned %d.\n", |
15365 | + suspend_sysfs_data->attr.name, result); |
15366 | + |
15367 | + return result; |
15368 | +} |
15369 | + |
15370 | +/* suspend_unregister_sysfs_file |
15371 | + * |
15372 | + * Helper for removing unwanted /sys/power/suspend2 entries. |
15373 | + * |
15374 | + */ |
15375 | +void suspend_unregister_sysfs_file(struct kobject *kobj, |
15376 | + struct suspend_sysfs_data *suspend_sysfs_data) |
15377 | +{ |
15378 | + sysfs_remove_file(kobj, &suspend_sysfs_data->attr); |
15379 | +} |
15380 | + |
15381 | +void suspend_cleanup_sysfs(void) |
15382 | +{ |
15383 | + int i, |
15384 | + numfiles = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data); |
15385 | + |
15386 | + if (!suspend_sysfs_initialised) |
15387 | + return; |
15388 | + |
15389 | + for (i=0; i< numfiles; i++) |
15390 | + suspend_unregister_sysfs_file(&suspend2_subsys.kset.kobj, |
15391 | + &sysfs_params[i]); |
15392 | + |
15393 | + kobj_set_kset_s(&suspend2_subsys.kset, power_subsys); |
15394 | + subsystem_unregister(&suspend2_subsys); |
15395 | + |
15396 | + suspend_sysfs_initialised = 0; |
15397 | +} |
15398 | + |
15399 | +/* suspend_initialise_sysfs |
15400 | + * |
15401 | + * Initialise the /sysfs/suspend2 directory. |
15402 | + */ |
15403 | + |
15404 | +static void suspend_initialise_sysfs(void) |
15405 | +{ |
15406 | + int i, error; |
15407 | + int numfiles = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data); |
15408 | + |
15409 | + if (suspend_sysfs_initialised) |
15410 | + return; |
15411 | + |
15412 | + /* Make our suspend2 directory a child of /sys/power */ |
15413 | + kobj_set_kset_s(&suspend2_subsys.kset, power_subsys); |
15414 | + error = subsystem_register(&suspend2_subsys); |
15415 | + |
15416 | + if (error) |
15417 | + return; |
15418 | + |
15419 | + /* Make it use the .store and .show routines above */ |
15420 | + kobj_set_kset_s(&suspend2_subsys.kset, suspend2_subsys); |
15421 | + |
15422 | + suspend_sysfs_initialised = 1; |
15423 | + |
15424 | + for (i=0; i< numfiles; i++) |
15425 | + suspend_register_sysfs_file(&suspend2_subsys.kset.kobj, |
15426 | + &sysfs_params[i]); |
15427 | +} |
15428 | + |
15429 | +int s2_sysfs_init(void) |
15430 | +{ |
15431 | + suspend_initialise_sysfs(); |
15432 | + return 0; |
15433 | +} |
15434 | + |
15435 | +void s2_sysfs_exit(void) |
15436 | +{ |
15437 | + suspend_cleanup_sysfs(); |
15438 | +} |
15439 | diff --git a/kernel/power/sysfs.h b/kernel/power/sysfs.h |
15440 | new file mode 100644 |
15441 | index 0000000..aad5e26 |
15442 | --- /dev/null |
15443 | +++ b/kernel/power/sysfs.h |
15444 | @@ -0,0 +1,132 @@ |
15445 | +/* |
15446 | + * kernel/power/sysfs.h |
15447 | + * |
15448 | + * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
15449 | + * |
15450 | + * This file is released under the GPLv2. |
15451 | + * |
15452 | + * It provides declarations for suspend to use in managing |
15453 | + * /sysfs/suspend2. When we switch to kobjects, |
15454 | + * this will become redundant. |
15455 | + * |
15456 | + */ |
15457 | + |
15458 | +#include <linux/sysfs.h> |
15459 | +#include "power.h" |
15460 | + |
15461 | +struct suspend_sysfs_data { |
15462 | + struct attribute attr; |
15463 | + int type; |
15464 | + int flags; |
15465 | + union { |
15466 | + struct { |
15467 | + unsigned long *bit_vector; |
15468 | + int bit; |
15469 | + } bit; |
15470 | + struct { |
15471 | + int *variable; |
15472 | + int minimum; |
15473 | + int maximum; |
15474 | + } integer; |
15475 | + struct { |
15476 | + long *variable; |
15477 | + long minimum; |
15478 | + long maximum; |
15479 | + } a_long; |
15480 | + struct { |
15481 | + unsigned long *variable; |
15482 | + unsigned long minimum; |
15483 | + unsigned long maximum; |
15484 | + } ul; |
15485 | + struct { |
15486 | + char *variable; |
15487 | + int max_length; |
15488 | + } string; |
15489 | + struct { |
15490 | + int (*read_sysfs) (const char *buffer, int count); |
15491 | + int (*write_sysfs) (const char *buffer, int count); |
15492 | + void *data; |
15493 | + } special; |
15494 | + } data; |
15495 | + |
15496 | + /* Side effects routines. Used, eg, for reparsing the |
15497 | + * resume2 entry when it changes */ |
15498 | + void (*read_side_effect) (void); |
15499 | + void (*write_side_effect) (void); |
15500 | + struct list_head sysfs_data_list; |
15501 | +}; |
15502 | + |
15503 | +enum { |
15504 | + SUSPEND_SYSFS_DATA_NONE = 1, |
15505 | + SUSPEND_SYSFS_DATA_CUSTOM, |
15506 | + SUSPEND_SYSFS_DATA_BIT, |
15507 | + SUSPEND_SYSFS_DATA_INTEGER, |
15508 | + SUSPEND_SYSFS_DATA_UL, |
15509 | + SUSPEND_SYSFS_DATA_LONG, |
15510 | + SUSPEND_SYSFS_DATA_STRING |
15511 | +}; |
15512 | + |
15513 | +#define SUSPEND2_ATTR(_name, _mode) \ |
15514 | + .attr = {.name = _name , .mode = _mode } |
15515 | + |
15516 | +#define SYSFS_BIT(_ul, _bit, _flags) \ |
15517 | + .type = SUSPEND_SYSFS_DATA_BIT, \ |
15518 | + .flags = _flags, \ |
15519 | + .data = { .bit = { .bit_vector = _ul, .bit = _bit } } |
15520 | + |
15521 | +#define SYSFS_INT(_int, _min, _max, _flags) \ |
15522 | + .type = SUSPEND_SYSFS_DATA_INTEGER, \ |
15523 | + .flags = _flags, \ |
15524 | + .data = { .integer = { .variable = _int, .minimum = _min, \ |
15525 | + .maximum = _max } } |
15526 | + |
15527 | +#define SYSFS_UL(_ul, _min, _max, _flags) \ |
15528 | + .type = SUSPEND_SYSFS_DATA_UL, \ |
15529 | + .flags = _flags, \ |
15530 | + .data = { .ul = { .variable = _ul, .minimum = _min, \ |
15531 | + .maximum = _max } } |
15532 | + |
15533 | +#define SYSFS_LONG(_long, _min, _max, _flags) \ |
15534 | + .type = SUSPEND_SYSFS_DATA_LONG, \ |
15535 | + .flags = _flags, \ |
15536 | + .data = { .a_long = { .variable = _long, .minimum = _min, \ |
15537 | + .maximum = _max } } |
15538 | + |
15539 | +#define SYSFS_STRING(_string, _max_len, _flags) \ |
15540 | + .type = SUSPEND_SYSFS_DATA_STRING, \ |
15541 | + .flags = _flags, \ |
15542 | + .data = { .string = { .variable = _string, .max_length = _max_len } } |
15543 | + |
15544 | +#define SYSFS_CUSTOM(_read, _write, _flags) \ |
15545 | + .type = SUSPEND_SYSFS_DATA_CUSTOM, \ |
15546 | + .flags = _flags, \ |
15547 | + .data = { .special = { .read_sysfs = _read, .write_sysfs = _write } } |
15548 | + |
15549 | +#define SYSFS_WRITEONLY 0200 |
15550 | +#define SYSFS_READONLY 0444 |
15551 | +#define SYSFS_RW 0644 |
15552 | + |
15553 | +/* Flags */ |
15554 | +#define SYSFS_NEEDS_SM_FOR_READ 1 |
15555 | +#define SYSFS_NEEDS_SM_FOR_WRITE 2 |
15556 | +#define SYSFS_SUSPEND 4 |
15557 | +#define SYSFS_RESUME 8 |
15558 | +#define SYSFS_SUSPEND_OR_RESUME (SYSFS_SUSPEND | SYSFS_RESUME) |
15559 | +#define SYSFS_SUSPENDING (SYSFS_SUSPEND | SYSFS_NEEDS_SM_FOR_WRITE) |
15560 | +#define SYSFS_RESUMING (SYSFS_RESUME | SYSFS_NEEDS_SM_FOR_WRITE) |
15561 | +#define SYSFS_NEEDS_SM_FOR_BOTH \ |
15562 | + (SYSFS_NEEDS_SM_FOR_READ | SYSFS_NEEDS_SM_FOR_WRITE) |
15563 | + |
15564 | +int suspend_register_sysfs_file(struct kobject *kobj, |
15565 | + struct suspend_sysfs_data *suspend_sysfs_data); |
15566 | +void suspend_unregister_sysfs_file(struct kobject *kobj, |
15567 | + struct suspend_sysfs_data *suspend_sysfs_data); |
15568 | + |
15569 | +extern struct subsystem suspend2_subsys; |
15570 | + |
15571 | +struct kobject *make_suspend2_sysdir(char *name); |
15572 | +void remove_suspend2_sysdir(struct kobject *obj); |
15573 | +extern void suspend_cleanup_sysfs(void); |
15574 | + |
15575 | +extern int s2_sysfs_init(void); |
15576 | +extern void s2_sysfs_exit(void); |
15577 | diff --git a/kernel/power/ui.c b/kernel/power/ui.c |
15578 | new file mode 100644 |
15579 | index 0000000..5b6789f |
15580 | --- /dev/null |
15581 | +++ b/kernel/power/ui.c |
15582 | @@ -0,0 +1,235 @@ |
15583 | +/* |
15584 | + * kernel/power/ui.c |
15585 | + * |
15586 | + * Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu> |
15587 | + * Copyright (C) 1998,2001,2002 Pavel Machek <pavel@suse.cz> |
15588 | + * Copyright (C) 2002-2003 Florent Chabaud <fchabaud@free.fr> |
15589 | + * Copyright (C) 2002-2007 Nigel Cunningham (nigel at suspend2 net) |
15590 | + * |
15591 | + * This file is released under the GPLv2. |
15592 | + * |
15593 | + * Routines for Suspend2's user interface. |
15594 | + * |
15595 | + * The user interface code talks to a userspace program via a |
15596 | + * netlink socket. |
15597 | + * |
15598 | + * The kernel side: |
15599 | + * - starts the userui program; |
15600 | + * - sends text messages and progress bar status; |
15601 | + * |
15602 | + * The user space side: |
15603 | + * - passes messages regarding user requests (abort, toggle reboot etc) |
15604 | + * |
15605 | + */ |
15606 | + |
15607 | +#define __KERNEL_SYSCALLS__ |
15608 | + |
15609 | +#include <linux/suspend.h> |
15610 | +#include <linux/freezer.h> |
15611 | +#include <linux/console.h> |
15612 | +#include <linux/ctype.h> |
15613 | +#include <linux/tty.h> |
15614 | +#include <linux/vt_kern.h> |
15615 | +#include <linux/module.h> |
15616 | +#include <linux/reboot.h> |
15617 | +#include <linux/kmod.h> |
15618 | +#include <linux/security.h> |
15619 | +#include <linux/syscalls.h> |
15620 | + |
15621 | +#include "sysfs.h" |
15622 | +#include "modules.h" |
15623 | +#include "suspend.h" |
15624 | +#include "ui.h" |
15625 | +#include "netlink.h" |
15626 | +#include "power_off.h" |
15627 | + |
15628 | +static char local_printf_buf[1024]; /* Same as printk - should be safe */ |
15629 | +struct ui_ops *s2_current_ui; |
15630 | + |
15631 | +/*! The console log level we default to. */ |
15632 | +int suspend_default_console_level = 0; |
15633 | + |
15634 | +/* suspend_early_boot_message() |
15635 | + * Description: Handle errors early in the process of booting. |
15636 | + * The user may press C to continue booting, perhaps |
15637 | + * invalidating the image, or space to reboot. |
15638 | + * This works from either the serial console or normally |
15639 | + * attached keyboard. |
15640 | + * |
15641 | + * Note that we come in here from init, while the kernel is |
15642 | + * locked. If we want to get events from the serial console, |
15643 | + * we need to temporarily unlock the kernel. |
15644 | + * |
15645 | + * suspend_early_boot_message may also be called post-boot. |
15646 | + * In this case, it simply printks the message and returns. |
15647 | + * |
15648 | + * Arguments: int Whether we are able to erase the image. |
15649 | + * int default_answer. What to do when we timeout. This |
15650 | + * will normally be continue, but the user might |
15651 | + * provide command line options (__setup) to override |
15652 | + * particular cases. |
15653 | + * Char *. Pointer to a string explaining why we're moaning. |
15654 | + */ |
15655 | + |
15656 | +#define say(message, a...) printk(KERN_EMERG message, ##a) |
15657 | +#define message_timeout 25 /* message_timeout * 10 must fit in 8 bits */ |
15658 | + |
15659 | +int suspend_early_boot_message(int message_detail, int default_answer, char *warning_reason, ...) |
15660 | +{ |
15661 | + unsigned long orig_state = get_suspend_state(), continue_req = 0; |
15662 | + unsigned long orig_loglevel = console_loglevel; |
15663 | + va_list args; |
15664 | + int printed_len; |
15665 | + |
15666 | + if (warning_reason) { |
15667 | + va_start(args, warning_reason); |
15668 | + printed_len = vsnprintf(local_printf_buf, |
15669 | + sizeof(local_printf_buf), |
15670 | + warning_reason, |
15671 | + args); |
15672 | + va_end(args); |
15673 | + } |
15674 | + |
15675 | + if (!test_suspend_state(SUSPEND_BOOT_TIME)) { |
15676 | + printk("Suspend2: %s\n", local_printf_buf); |
15677 | + return default_answer; |
15678 | + } |
15679 | + |
15680 | + /* We might be called directly from do_mounts_initrd if the |
15681 | + * user fails to set up their initrd properly. We need to |
15682 | + * enable the keyboard handler by setting the running flag */ |
15683 | + set_suspend_state(SUSPEND_RUNNING); |
15684 | + |
15685 | +#if defined(CONFIG_VT) || defined(CONFIG_SERIAL_CONSOLE) |
15686 | + console_loglevel = 7; |
15687 | + |
15688 | + say("=== Suspend2 ===\n\n"); |
15689 | + if (warning_reason) { |
15690 | + say("BIG FAT WARNING!! %s\n\n", local_printf_buf); |
15691 | + switch (message_detail) { |
15692 | + case 0: |
15693 | + say("If you continue booting, note that any image WILL NOT BE REMOVED.\n"); |
15694 | + say("Suspend is unable to do so because the appropriate modules aren't\n"); |
15695 | + say("loaded. You should manually remove the image to avoid any\n"); |
15696 | + say("possibility of corrupting your filesystem(s) later.\n"); |
15697 | + break; |
15698 | + case 1: |
15699 | + say("If you want to use the current suspend image, reboot and try\n"); |
15700 | + say("again with the same kernel that you suspended from. If you want\n"); |
15701 | + say("to forget that image, continue and the image will be erased.\n"); |
15702 | + break; |
15703 | + } |
15704 | + say("Press SPACE to reboot or C to continue booting with this kernel\n\n"); |
15705 | + say("Default action if you don't select one in %d seconds is: %s.\n", |
15706 | + message_timeout, |
15707 | + default_answer == SUSPEND_CONTINUE_REQ ? |
15708 | + "continue booting" : "reboot"); |
15709 | + } else { |
15710 | + say("BIG FAT WARNING!!\n\n"); |
15711 | + say("You have tried to resume from this image before.\n"); |
15712 | + say("If it failed once, it may well fail again.\n"); |
15713 | + say("Would you like to remove the image and boot normally?\n"); |
15714 | + say("This will be equivalent to entering noresume2 on the\n"); |
15715 | + say("kernel command line.\n\n"); |
15716 | + say("Press SPACE to remove the image or C to continue resuming.\n\n"); |
15717 | + say("Default action if you don't select one in %d seconds is: %s.\n", |
15718 | + message_timeout, |
15719 | + !!default_answer ? |
15720 | + "continue resuming" : "remove the image"); |
15721 | + } |
15722 | + console_loglevel = orig_loglevel; |
15723 | + |
15724 | + set_suspend_state(SUSPEND_SANITY_CHECK_PROMPT); |
15725 | + clear_suspend_state(SUSPEND_CONTINUE_REQ); |
15726 | + |
15727 | + if (suspend_wait_for_keypress(message_timeout) == 0) /* We timed out */ |
15728 | + continue_req = !!default_answer; |
15729 | + else |
15730 | + continue_req = test_suspend_state(SUSPEND_CONTINUE_REQ); |
15731 | + |
15732 | + if ((warning_reason) && (!continue_req)) |
15733 | + machine_restart(NULL); |
15734 | + |
15735 | + restore_suspend_state(orig_state); |
15736 | + if (continue_req) |
15737 | + set_suspend_state(SUSPEND_CONTINUE_REQ); |
15738 | + |
15739 | +#endif /* CONFIG_VT or CONFIG_SERIAL_CONSOLE */ |
15740 | + return -EIO; |
15741 | +} |
15742 | +#undef say |
15743 | + |
15744 | +/* |
15745 | + * User interface specific /sys/power/suspend2 entries. |
15746 | + */ |
15747 | + |
15748 | +static struct suspend_sysfs_data sysfs_params[] = { |
15749 | +#if defined(CONFIG_NET) && defined(CONFIG_SYSFS) |
15750 | + { SUSPEND2_ATTR("default_console_level", SYSFS_RW), |
15751 | + SYSFS_INT(&suspend_default_console_level, 0, 7, 0) |
15752 | + }, |
15753 | + |
15754 | + { SUSPEND2_ATTR("debug_sections", SYSFS_RW), |
15755 | + SYSFS_UL(&suspend_debug_state, 0, 1 << 30, 0) |
15756 | + }, |
15757 | + |
15758 | + { SUSPEND2_ATTR("log_everything", SYSFS_RW), |
15759 | + SYSFS_BIT(&suspend_action, SUSPEND_LOGALL, 0) |
15760 | + }, |
15761 | +#endif |
15762 | + { SUSPEND2_ATTR("pm_prepare_console", SYSFS_RW), |
15763 | + SYSFS_BIT(&suspend_action, SUSPEND_PM_PREPARE_CONSOLE, 0) |
15764 | + } |
15765 | +}; |
15766 | + |
15767 | +static struct suspend_module_ops userui_ops = { |
15768 | + .type = MISC_MODULE, |
15769 | + .name = "Basic User Interface", |
15770 | + .directory = "user_interface", |
15771 | + .module = THIS_MODULE, |
15772 | + .sysfs_data = sysfs_params, |
15773 | + .num_sysfs_entries = sizeof(sysfs_params) / sizeof(struct suspend_sysfs_data), |
15774 | +}; |
15775 | + |
15776 | +int s2_register_ui_ops(struct ui_ops *this_ui) |
15777 | +{ |
15778 | + if (s2_current_ui) { |
15779 | + printk("Only one Suspend2 user interface module can be loaded" |
15780 | + " at a time."); |
15781 | + return -EBUSY; |
15782 | + } |
15783 | + |
15784 | + s2_current_ui = this_ui; |
15785 | + |
15786 | + return 0; |
15787 | +} |
15788 | + |
15789 | +void s2_remove_ui_ops(struct ui_ops *this_ui) |
15790 | +{ |
15791 | + if (s2_current_ui != this_ui) |
15792 | + return; |
15793 | + |
15794 | + s2_current_ui = NULL; |
15795 | +} |
15796 | + |
15797 | +/* suspend_console_sysfs_init |
15798 | + * Description: Boot time initialisation for user interface. |
15799 | + */ |
15800 | + |
15801 | +int s2_ui_init(void) |
15802 | +{ |
15803 | + return suspend_register_module(&userui_ops); |
15804 | +} |
15805 | + |
15806 | +void s2_ui_exit(void) |
15807 | +{ |
15808 | + suspend_unregister_module(&userui_ops); |
15809 | +} |
15810 | + |
15811 | +#ifdef CONFIG_SUSPEND2_EXPORTS |
15812 | +EXPORT_SYMBOL_GPL(s2_current_ui); |
15813 | +EXPORT_SYMBOL_GPL(suspend_early_boot_message); |
15814 | +EXPORT_SYMBOL_GPL(s2_register_ui_ops); |
15815 | +EXPORT_SYMBOL_GPL(s2_remove_ui_ops); |
15816 | +EXPORT_SYMBOL_GPL(suspend_default_console_level); |
15817 | +#endif |
15818 | diff --git a/kernel/power/ui.h b/kernel/power/ui.h |
15819 | new file mode 100644 |
15820 | index 0000000..2d1034c |
15821 | --- /dev/null |
15822 | +++ b/kernel/power/ui.h |
15823 | @@ -0,0 +1,108 @@ |
15824 | +/* |
15825 | + * kernel/power/ui.h |
15826 | + * |
15827 | + * Copyright (C) 2004-2007 Nigel Cunningham (nigel at suspend2 net) |
15828 | + */ |
15829 | + |
15830 | +enum { |
15831 | + DONT_CLEAR_BAR, |
15832 | + CLEAR_BAR |
15833 | +}; |
15834 | + |
15835 | +enum { |
15836 | + /* Userspace -> Kernel */ |
15837 | + USERUI_MSG_ABORT = 0x11, |
15838 | + USERUI_MSG_SET_STATE = 0x12, |
15839 | + USERUI_MSG_GET_STATE = 0x13, |
15840 | + USERUI_MSG_GET_DEBUG_STATE = 0x14, |
15841 | + USERUI_MSG_SET_DEBUG_STATE = 0x15, |
15842 | + USERUI_MSG_SPACE = 0x18, |
15843 | + USERUI_MSG_GET_POWERDOWN_METHOD = 0x1A, |
15844 | + USERUI_MSG_SET_POWERDOWN_METHOD = 0x1B, |
15845 | + USERUI_MSG_GET_LOGLEVEL = 0x1C, |
15846 | + USERUI_MSG_SET_LOGLEVEL = 0x1D, |
15847 | + |
15848 | + /* Kernel -> Userspace */ |
15849 | + USERUI_MSG_MESSAGE = 0x21, |
15850 | + USERUI_MSG_PROGRESS = 0x22, |
15851 | + USERUI_MSG_REDRAW = 0x25, |
15852 | + |
15853 | + USERUI_MSG_MAX, |
15854 | +}; |
15855 | + |
15856 | +struct userui_msg_params { |
15857 | + unsigned long a, b, c, d; |
15858 | + char text[255]; |
15859 | +}; |
15860 | + |
15861 | +struct ui_ops { |
15862 | + char (*wait_for_key) (int timeout); |
15863 | + unsigned long (*update_status) (unsigned long value, |
15864 | + unsigned long maximum, const char *fmt, ...); |
15865 | + void (*prepare_status) (int clearbar, const char *fmt, ...); |
15866 | + void (*cond_pause) (int pause, char *message); |
15867 | + void (*abort)(int result_code, const char *fmt, ...); |
15868 | + void (*prepare)(void); |
15869 | + void (*cleanup)(void); |
15870 | + void (*redraw)(void); |
15871 | + void (*message)(unsigned long section, unsigned long level, |
15872 | + int normally_logged, const char *fmt, ...); |
15873 | +}; |
15874 | + |
15875 | +extern struct ui_ops *s2_current_ui; |
15876 | + |
15877 | +#define suspend_update_status(val, max, fmt, args...) \ |
15878 | + (s2_current_ui ? (s2_current_ui->update_status) (val, max, fmt, ##args) : max) |
15879 | + |
15880 | +#define suspend_wait_for_keypress(timeout) \ |
15881 | + (s2_current_ui ? (s2_current_ui->wait_for_key) (timeout) : 0) |
15882 | + |
15883 | +#define suspend_ui_redraw(void) \ |
15884 | + do { if (s2_current_ui) \ |
15885 | + (s2_current_ui->redraw)(); \ |
15886 | + } while(0) |
15887 | + |
15888 | +#define suspend_prepare_console(void) \ |
15889 | + do { if (s2_current_ui) \ |
15890 | + (s2_current_ui->prepare)(); \ |
15891 | + } while(0) |
15892 | + |
15893 | +#define suspend_cleanup_console(void) \ |
15894 | + do { if (s2_current_ui) \ |
15895 | + (s2_current_ui->cleanup)(); \ |
15896 | + } while(0) |
15897 | + |
15898 | +#define abort_suspend(result, fmt, args...) \ |
15899 | + do { if (s2_current_ui) \ |
15900 | + (s2_current_ui->abort)(result, fmt, ##args); \ |
15901 | + else { \ |
15902 | + set_result_state(SUSPEND_ABORTED); \ |
15903 | + set_result_state(result); \ |
15904 | + } \ |
15905 | + } while(0) |
15906 | + |
15907 | +#define suspend_cond_pause(pause, message) \ |
15908 | + do { if (s2_current_ui) \ |
15909 | + (s2_current_ui->cond_pause)(pause, message); \ |
15910 | + } while(0) |
15911 | + |
15912 | +#define suspend_prepare_status(clear, fmt, args...) \ |
15913 | + do { if (s2_current_ui) \ |
15914 | + (s2_current_ui->prepare_status)(clear, fmt, ##args); \ |
15915 | + else \ |
15916 | + printk(fmt, ##args); \ |
15917 | + } while(0) |
15918 | + |
15919 | +extern int suspend_default_console_level; |
15920 | + |
15921 | +#define suspend_message(sn, lev, log, fmt, a...) \ |
15922 | +do { \ |
15923 | + if (s2_current_ui && (!sn || test_debug_state(sn))) \ |
15924 | + s2_current_ui->message(sn, lev, log, fmt, ##a); \ |
15925 | +} while(0) |
15926 | + |
15927 | +__exit void suspend_ui_cleanup(void); |
15928 | +extern int s2_ui_init(void); |
15929 | +extern void s2_ui_exit(void); |
15930 | +extern int s2_register_ui_ops(struct ui_ops *this_ui); |
15931 | +extern void s2_remove_ui_ops(struct ui_ops *this_ui); |
15932 | diff --git a/kernel/printk.c b/kernel/printk.c |
15933 | index 4b47e59..6cafd3b 100644 |
15934 | --- a/kernel/printk.c |
15935 | +++ b/kernel/printk.c |
15936 | @@ -32,6 +32,7 @@ |
15937 | #include <linux/bootmem.h> |
15938 | #include <linux/syscalls.h> |
15939 | #include <linux/jiffies.h> |
15940 | +#include <linux/suspend.h> |
15941 | |
15942 | #include <asm/uaccess.h> |
15943 | |
15944 | @@ -92,9 +93,9 @@ static DEFINE_SPINLOCK(logbuf_lock); |
15945 | * The indices into log_buf are not constrained to log_buf_len - they |
15946 | * must be masked before subscripting |
15947 | */ |
15948 | -static unsigned long log_start; /* Index into log_buf: next char to be read by syslog() */ |
15949 | -static unsigned long con_start; /* Index into log_buf: next char to be sent to consoles */ |
15950 | -static unsigned long log_end; /* Index into log_buf: most-recently-written-char + 1 */ |
15951 | +static unsigned long POSS_NOSAVE log_start; /* Index into log_buf: next char to be read by syslog() */ |
15952 | +static unsigned long POSS_NOSAVE con_start; /* Index into log_buf: next char to be sent to consoles */ |
15953 | +static unsigned long POSS_NOSAVE log_end; /* Index into log_buf: most-recently-written-char + 1 */ |
15954 | |
15955 | /* |
15956 | * Array of consoles built from command line options (console=) |
15957 | @@ -117,10 +118,10 @@ static int console_may_schedule; |
15958 | |
15959 | #ifdef CONFIG_PRINTK |
15960 | |
15961 | -static char __log_buf[__LOG_BUF_LEN]; |
15962 | -static char *log_buf = __log_buf; |
15963 | -static int log_buf_len = __LOG_BUF_LEN; |
15964 | -static unsigned long logged_chars; /* Number of chars produced since last read+clear operation */ |
15965 | +static char POSS_NOSAVE __log_buf[__LOG_BUF_LEN]; |
15966 | +static char POSS_NOSAVE *log_buf = __log_buf; |
15967 | +static int POSS_NOSAVE log_buf_len = __LOG_BUF_LEN; |
15968 | +static unsigned long POSS_NOSAVE logged_chars; /* Number of chars produced since last read+clear operation */ |
15969 | |
15970 | static int __init log_buf_len_setup(char *str) |
15971 | { |
15972 | @@ -739,12 +740,14 @@ void suspend_console(void) |
15973 | acquire_console_sem(); |
15974 | console_suspended = 1; |
15975 | } |
15976 | +EXPORT_SYMBOL(suspend_console); |
15977 | |
15978 | void resume_console(void) |
15979 | { |
15980 | console_suspended = 0; |
15981 | release_console_sem(); |
15982 | } |
15983 | +EXPORT_SYMBOL(resume_console); |
15984 | #endif /* CONFIG_DISABLE_CONSOLE_SUSPEND */ |
15985 | |
15986 | /** |
15987 | diff --git a/kernel/timer.c b/kernel/timer.c |
15988 | index dd6c2c1..aded05d 100644 |
15989 | --- a/kernel/timer.c |
15990 | +++ b/kernel/timer.c |
15991 | @@ -1240,6 +1240,38 @@ unsigned long avenrun[3]; |
15992 | |
15993 | EXPORT_SYMBOL(avenrun); |
15994 | |
15995 | +static unsigned long avenrun_save[3]; |
15996 | +/* |
15997 | + * save_avenrun - Record the values prior to starting a hibernation cycle. |
15998 | + * We do this to make the work done in hibernation invisible to userspace |
15999 | + * post-suspend. Some programs, including some MTAs, watch the load average |
16000 | + * and stop work until it lowers. Without this, they would stop working for |
16001 | + * a while post-resume, unnecessarily. |
16002 | + */ |
16003 | + |
16004 | +void save_avenrun(void) |
16005 | +{ |
16006 | + avenrun_save[0] = avenrun[0]; |
16007 | + avenrun_save[1] = avenrun[1]; |
16008 | + avenrun_save[2] = avenrun[2]; |
16009 | +} |
16010 | + |
16011 | +EXPORT_SYMBOL_GPL(save_avenrun); |
16012 | + |
16013 | +void restore_avenrun(void) |
16014 | +{ |
16015 | + if (!avenrun_save[0]) |
16016 | + return; |
16017 | + |
16018 | + avenrun[0] = avenrun_save[0]; |
16019 | + avenrun[1] = avenrun_save[1]; |
16020 | + avenrun[2] = avenrun_save[2]; |
16021 | + |
16022 | + avenrun_save[0] = 0; |
16023 | +} |
16024 | + |
16025 | +EXPORT_SYMBOL_GPL(restore_avenrun); |
16026 | + |
16027 | /* |
16028 | * calc_load - given tick count, update the avenrun load estimates. |
16029 | * This is called while holding a write_lock on xtime_lock. |
16030 | diff --git a/lib/Kconfig b/lib/Kconfig |
16031 | index 3842499..758a928 100644 |
16032 | --- a/lib/Kconfig |
16033 | +++ b/lib/Kconfig |
16034 | @@ -47,6 +47,9 @@ config AUDIT_GENERIC |
16035 | depends on AUDIT && !AUDIT_ARCH |
16036 | default y |
16037 | |
16038 | +config DYN_PAGEFLAGS |
16039 | + bool |
16040 | + |
16041 | # |
16042 | # compression support is select'ed if needed |
16043 | # |
16044 | diff --git a/lib/Makefile b/lib/Makefile |
16045 | index 992a39e..b974998 100644 |
16046 | --- a/lib/Makefile |
16047 | +++ b/lib/Makefile |
16048 | @@ -38,6 +38,9 @@ ifneq ($(CONFIG_HAVE_DEC_LOCK),y) |
16049 | endif |
16050 | |
16051 | obj-$(CONFIG_BITREVERSE) += bitrev.o |
16052 | + |
16053 | +obj-$(CONFIG_DYN_PAGEFLAGS) += dyn_pageflags.o |
16054 | + |
16055 | obj-$(CONFIG_CRC_CCITT) += crc-ccitt.o |
16056 | obj-$(CONFIG_CRC16) += crc16.o |
16057 | obj-$(CONFIG_CRC32) += crc32.o |
16058 | diff --git a/lib/dyn_pageflags.c b/lib/dyn_pageflags.c |
16059 | new file mode 100644 |
16060 | index 0000000..963ac5c |
16061 | --- /dev/null |
16062 | +++ b/lib/dyn_pageflags.c |
16063 | @@ -0,0 +1,312 @@ |
16064 | +/* |
16065 | + * lib/dyn_pageflags.c |
16066 | + * |
16067 | + * Copyright (C) 2004-2006 Nigel Cunningham <nigel@suspend2.net> |
16068 | + * |
16069 | + * This file is released under the GPLv2. |
16070 | + * |
16071 | + * Routines for dynamically allocating and releasing bitmaps |
16072 | + * used as pseudo-pageflags. |
16073 | + */ |
16074 | + |
16075 | +#include <linux/module.h> |
16076 | +#include <linux/dyn_pageflags.h> |
16077 | +#include <linux/bootmem.h> |
16078 | +#include <linux/mm.h> |
16079 | + |
16080 | +#if 0 |
16081 | +#define PR_DEBUG(a, b...) do { printk(a, ##b); } while(0) |
16082 | +#else |
16083 | +#define PR_DEBUG(a, b...) do { } while(0) |
16084 | +#endif |
16085 | + |
16086 | +#define pages_for_zone(zone) \ |
16087 | + (DIV_ROUND_UP((zone)->spanned_pages, (PAGE_SIZE << 3))) |
16088 | + |
16089 | +/* |
16090 | + * clear_dyn_pageflags(dyn_pageflags_t pagemap) |
16091 | + * |
16092 | + * Clear an array used to store local page flags. |
16093 | + * |
16094 | + */ |
16095 | + |
16096 | +void clear_dyn_pageflags(dyn_pageflags_t pagemap) |
16097 | +{ |
16098 | + int i = 0, zone_idx, node_id = 0; |
16099 | + struct zone *zone; |
16100 | + struct pglist_data *pgdat; |
16101 | + |
16102 | + BUG_ON(!pagemap); |
16103 | + |
16104 | + for_each_online_pgdat(pgdat) { |
16105 | + for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) { |
16106 | + zone = &pgdat->node_zones[zone_idx]; |
16107 | + |
16108 | + if (!populated_zone(zone)) |
16109 | + continue; |
16110 | + |
16111 | + for (i = 0; i < pages_for_zone(zone); i++) |
16112 | + memset((pagemap[node_id][zone_idx][i]), 0, |
16113 | + PAGE_SIZE); |
16114 | + } |
16115 | + node_id++; |
16116 | + } |
16117 | +} |
16118 | + |
16119 | +/* |
16120 | + * free_dyn_pageflags(dyn_pageflags_t pagemap) |
16121 | + * |
16122 | + * Free a dynamically allocated pageflags bitmap. For Suspend2 usage, we |
16123 | + * support data being relocated from slab to pages that don't conflict |
16124 | + * with the image that will be copied back. This is the reason for the |
16125 | + * PageSlab tests below. |
16126 | + * |
16127 | + */ |
16128 | +void free_dyn_pageflags(dyn_pageflags_t *pagemap) |
16129 | +{ |
16130 | + int i = 0, zone_pages, node_id = -1, zone_idx; |
16131 | + struct zone *zone; |
16132 | + struct pglist_data *pgdat; |
16133 | + |
16134 | + if (!*pagemap) |
16135 | + return; |
16136 | + |
16137 | + PR_DEBUG("Seeking to free dyn_pageflags %p.\n", pagemap); |
16138 | + |
16139 | + for_each_online_pgdat(pgdat) { |
16140 | + node_id++; |
16141 | + |
16142 | + PR_DEBUG("Node id %d.\n", node_id); |
16143 | + |
16144 | + if (!(*pagemap)[node_id]) { |
16145 | + PR_DEBUG("Node %d unallocated.\n", node_id); |
16146 | + continue; |
16147 | + } |
16148 | + |
16149 | + for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) { |
16150 | + zone = &pgdat->node_zones[zone_idx]; |
16151 | + if (!populated_zone(zone)) { |
16152 | + PR_DEBUG("Node %d zone %d unpopulated.\n", node_id, zone_idx); |
16153 | + continue; |
16154 | + } |
16155 | + |
16156 | + if (!(*pagemap)[node_id][zone_idx]) { |
16157 | + PR_DEBUG("Node %d zone %d unallocated.\n", node_id, zone_idx); |
16158 | + continue; |
16159 | + } |
16160 | + |
16161 | + PR_DEBUG("Node id %d. Zone %d.\n", node_id, zone_idx); |
16162 | + |
16163 | + zone_pages = pages_for_zone(zone); |
16164 | + |
16165 | + for (i = 0; i < zone_pages; i++) { |
16166 | + PR_DEBUG("Node id %d. Zone %d. Page %d.\n", node_id, zone_idx, i); |
16167 | + free_page((unsigned long)(*pagemap)[node_id][zone_idx][i]); |
16168 | + } |
16169 | + |
16170 | + kfree((*pagemap)[node_id][zone_idx]); |
16171 | + } |
16172 | + PR_DEBUG("Free node %d (%p).\n", node_id, pagemap[node_id]); |
16173 | + kfree((*pagemap)[node_id]); |
16174 | + } |
16175 | + |
16176 | + PR_DEBUG("Free map pgdat list at %p.\n", pagemap); |
16177 | + kfree(*pagemap); |
16178 | + |
16179 | + *pagemap = NULL; |
16180 | + PR_DEBUG("Done.\n"); |
16181 | + return; |
16182 | +} |
16183 | + |
16184 | +static int try_alloc_dyn_pageflag_part(int nr_ptrs, void **ptr) |
16185 | +{ |
16186 | + *ptr = kzalloc(sizeof(void *) * nr_ptrs, GFP_ATOMIC); |
16187 | + PR_DEBUG("Got %p. Putting it in %p.\n", *ptr, ptr); |
16188 | + |
16189 | + if (*ptr) |
16190 | + return 0; |
16191 | + |
16192 | + printk("Error. Unable to allocate memory for dynamic pageflags."); |
16193 | + return -ENOMEM; |
16194 | +} |
16195 | + |
16196 | +/* |
16197 | + * allocate_dyn_pageflags |
16198 | + * |
16199 | + * Allocate a bitmap for dynamic page flags. |
16200 | + * |
16201 | + */ |
16202 | +int allocate_dyn_pageflags(dyn_pageflags_t *pagemap) |
16203 | +{ |
16204 | + int i, zone_idx, zone_pages, node_id = 0; |
16205 | + struct zone *zone; |
16206 | + struct pglist_data *pgdat; |
16207 | + |
16208 | + if (*pagemap) { |
16209 | + PR_DEBUG("Pagemap %p already allocated.\n", pagemap); |
16210 | + return 0; |
16211 | + } |
16212 | + |
16213 | + PR_DEBUG("Seeking to allocate dyn_pageflags %p.\n", pagemap); |
16214 | + |
16215 | + for_each_online_pgdat(pgdat) |
16216 | + node_id++; |
16217 | + |
16218 | + if (try_alloc_dyn_pageflag_part(node_id, (void **) pagemap)) |
16219 | + return -ENOMEM; |
16220 | + |
16221 | + node_id = 0; |
16222 | + |
16223 | + for_each_online_pgdat(pgdat) { |
16224 | + PR_DEBUG("Node %d.\n", node_id); |
16225 | + |
16226 | + if (try_alloc_dyn_pageflag_part(MAX_NR_ZONES, |
16227 | + (void **) &(*pagemap)[node_id])) |
16228 | + return -ENOMEM; |
16229 | + |
16230 | + for (zone_idx = 0; zone_idx < MAX_NR_ZONES; zone_idx++) { |
16231 | + PR_DEBUG("Zone %d of %d.\n", zone_idx, MAX_NR_ZONES); |
16232 | + |
16233 | + zone = &pgdat->node_zones[zone_idx]; |
16234 | + |
16235 | + if (!populated_zone(zone)) { |
16236 | + PR_DEBUG("Node %d zone %d unpopulated - won't allocate.\n", node_id, zone_idx); |
16237 | + continue; |
16238 | + } |
16239 | + |
16240 | + zone_pages = pages_for_zone(zone); |
16241 | + |
16242 | + PR_DEBUG("Node %d zone %d (needs %d pages).\n", node_id, zone_idx, zone_pages); |
16243 | + |
16244 | + if (try_alloc_dyn_pageflag_part(zone_pages, |
16245 | + (void **) &(*pagemap)[node_id][zone_idx])) |
16246 | + return -ENOMEM; |
16247 | + |
16248 | + for (i = 0; i < zone_pages; i++) { |
16249 | + unsigned long address = get_zeroed_page(GFP_ATOMIC); |
16250 | + if (!address) { |
16251 | + PR_DEBUG("Error. Unable to allocate memory for " |
16252 | + "dynamic pageflags."); |
16253 | + free_dyn_pageflags(pagemap); |
16254 | + return -ENOMEM; |
16255 | + } |
16256 | + PR_DEBUG("Node %d zone %d. Page %d.\n", node_id, zone_idx, i); |
16257 | + (*pagemap)[node_id][zone_idx][i] = |
16258 | + (unsigned long *) address; |
16259 | + } |
16260 | + } |
16261 | + node_id++; |
16262 | + } |
16263 | + |
16264 | + PR_DEBUG("Done.\n"); |
16265 | + return 0; |
16266 | +} |
16267 | + |
16268 | +#define GET_BIT_AND_UL(bitmap, page) \ |
16269 | + struct zone *zone = page_zone(page); \ |
16270 | + unsigned long zone_pfn = page_to_pfn(page) - zone->zone_start_pfn; \ |
16271 | + int node = page_to_nid(page); \ |
16272 | + int zone_num = zone_idx(zone); \ |
16273 | + int pagenum = PAGENUMBER(zone_pfn); \ |
16274 | + int page_offset = PAGEINDEX(zone_pfn); \ |
16275 | + unsigned long *ul = ((*bitmap)[node][zone_num][pagenum]) + page_offset; \ |
16276 | + int bit = PAGEBIT(zone_pfn); |
16277 | + |
16278 | +/* |
16279 | + * test_dynpageflag(dyn_pageflags_t *bitmap, struct page *page) |
16280 | + * |
16281 | + * Is the page flagged in the given bitmap? |
16282 | + * |
16283 | + */ |
16284 | + |
16285 | +int test_dynpageflag(dyn_pageflags_t *bitmap, struct page *page) |
16286 | +{ |
16287 | + GET_BIT_AND_UL(bitmap, page); |
16288 | + return test_bit(bit, ul); |
16289 | +} |
16290 | + |
16291 | +/* |
16292 | + * set_dynpageflag(dyn_pageflags_t *bitmap, struct page *page) |
16293 | + * |
16294 | + * Set the flag for the page in the given bitmap. |
16295 | + * |
16296 | + */ |
16297 | + |
16298 | +void set_dynpageflag(dyn_pageflags_t *bitmap, struct page *page) |
16299 | +{ |
16300 | + GET_BIT_AND_UL(bitmap, page); |
16301 | + set_bit(bit, ul); |
16302 | +} |
16303 | + |
16304 | +/* |
16305 | + * clear_dynpageflags(dyn_pageflags_t *bitmap, struct page *page) |
16306 | + * |
16307 | + * Clear the flag for the page in the given bitmap. |
16308 | + * |
16309 | + */ |
16310 | + |
16311 | +void clear_dynpageflag(dyn_pageflags_t *bitmap, struct page *page) |
16312 | +{ |
16313 | + GET_BIT_AND_UL(bitmap, page); |
16314 | + clear_bit(bit, ul); |
16315 | +} |
16316 | + |
16317 | +/* |
16318 | + * get_next_bit_on(dyn_pageflags_t bitmap, int counter) |
16319 | + * |
16320 | + * Given a pfn (possibly -1), find the next pfn in the bitmap that |
16321 | + * is set. If there are no more flags set, return -1. |
16322 | + * |
16323 | + */ |
16324 | + |
16325 | +unsigned long get_next_bit_on(dyn_pageflags_t bitmap, unsigned long counter) |
16326 | +{ |
16327 | + struct page *page; |
16328 | + struct zone *zone; |
16329 | + unsigned long *ul = NULL; |
16330 | + unsigned long zone_offset; |
16331 | + int pagebit, zone_num, first = (counter == (max_pfn + 1)), node; |
16332 | + |
16333 | + if (first) |
16334 | + counter = first_online_pgdat()->node_zones->zone_start_pfn; |
16335 | + |
16336 | + page = pfn_to_page(counter); |
16337 | + zone = page_zone(page); |
16338 | + node = zone->zone_pgdat->node_id; |
16339 | + zone_num = zone_idx(zone); |
16340 | + zone_offset = counter - zone->zone_start_pfn; |
16341 | + |
16342 | + if (first) |
16343 | + goto test; |
16344 | + |
16345 | + do { |
16346 | + zone_offset++; |
16347 | + |
16348 | + if (zone_offset >= zone->spanned_pages) { |
16349 | + do { |
16350 | + zone = next_zone(zone); |
16351 | + if (!zone) |
16352 | + return max_pfn + 1; |
16353 | + } while(!zone->spanned_pages); |
16354 | + |
16355 | + zone_num = zone_idx(zone); |
16356 | + node = zone->zone_pgdat->node_id; |
16357 | + zone_offset = 0; |
16358 | + } |
16359 | +test: |
16360 | + pagebit = PAGEBIT(zone_offset); |
16361 | + |
16362 | + if (!pagebit || !ul) |
16363 | + ul = (bitmap[node][zone_num][PAGENUMBER(zone_offset)]) |
16364 | + + PAGEINDEX(zone_offset); |
16365 | + |
16366 | + if (!(*ul & ~((1 << pagebit) - 1))) { |
16367 | + zone_offset += BITS_PER_LONG - pagebit - 1; |
16368 | + continue; |
16369 | + } |
16370 | + |
16371 | + } while(!test_bit(pagebit, ul)); |
16372 | + |
16373 | + return zone->zone_start_pfn + zone_offset; |
16374 | +} |
16375 | + |
16376 | diff --git a/lib/vsprintf.c b/lib/vsprintf.c |
16377 | index b025864..2138c47 100644 |
16378 | --- a/lib/vsprintf.c |
16379 | +++ b/lib/vsprintf.c |
16380 | @@ -236,6 +236,29 @@ static char * number(char * buf, char * end, unsigned long long num, int base, i |
16381 | return buf; |
16382 | } |
16383 | |
16384 | +/* |
16385 | + * vsnprintf_used |
16386 | + * |
16387 | + * Functionality : Print a string with parameters to a buffer of a |
16388 | + * limited size. Unlike vsnprintf, we return the number |
16389 | + * of bytes actually put in the buffer, not the number |
16390 | + * that would have been put in if it was big enough. |
16391 | + */ |
16392 | +int snprintf_used(char *buffer, int buffer_size, const char *fmt, ...) |
16393 | +{ |
16394 | + int result; |
16395 | + va_list args; |
16396 | + |
16397 | + if (!buffer_size) |
16398 | + return 0; |
16399 | + |
16400 | + va_start(args, fmt); |
16401 | + result = vsnprintf(buffer, buffer_size, fmt, args); |
16402 | + va_end(args); |
16403 | + |
16404 | + return result > buffer_size ? buffer_size : result; |
16405 | +} |
16406 | + |
16407 | /** |
16408 | * vsnprintf - Format a string and place it in a buffer |
16409 | * @buf: The buffer to place the result into |
16410 | diff --git a/mm/vmscan.c b/mm/vmscan.c |
16411 | index db023e2..54acc2c 100644 |
16412 | --- a/mm/vmscan.c |
16413 | +++ b/mm/vmscan.c |
16414 | @@ -654,6 +654,28 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan, |
16415 | return nr_taken; |
16416 | } |
16417 | |
16418 | +/* return_lru_pages puts a list of pages back on a zone's lru lists. */ |
16419 | + |
16420 | +static void return_lru_pages(struct list_head *page_list, struct zone *zone, |
16421 | + struct pagevec *pvec) |
16422 | +{ |
16423 | + while (!list_empty(page_list)) { |
16424 | + struct page *page = lru_to_page(page_list); |
16425 | + VM_BUG_ON(PageLRU(page)); |
16426 | + SetPageLRU(page); |
16427 | + list_del(&page->lru); |
16428 | + if (PageActive(page)) |
16429 | + add_page_to_active_list(zone, page); |
16430 | + else |
16431 | + add_page_to_inactive_list(zone, page); |
16432 | + if (!pagevec_add(pvec, page)) { |
16433 | + spin_unlock_irq(&zone->lru_lock); |
16434 | + __pagevec_release(pvec); |
16435 | + spin_lock_irq(&zone->lru_lock); |
16436 | + } |
16437 | + } |
16438 | +} |
16439 | + |
16440 | /* |
16441 | * shrink_inactive_list() is a helper for shrink_zone(). It returns the number |
16442 | * of reclaimed pages |
16443 | @@ -671,7 +693,6 @@ static unsigned long shrink_inactive_list(unsigned long max_scan, |
16444 | lru_add_drain(); |
16445 | spin_lock_irq(&zone->lru_lock); |
16446 | do { |
16447 | - struct page *page; |
16448 | unsigned long nr_taken; |
16449 | unsigned long nr_scan; |
16450 | unsigned long nr_freed; |
16451 | @@ -701,21 +722,7 @@ static unsigned long shrink_inactive_list(unsigned long max_scan, |
16452 | /* |
16453 | * Put back any unfreeable pages. |
16454 | */ |
16455 | - while (!list_empty(&page_list)) { |
16456 | - page = lru_to_page(&page_list); |
16457 | - VM_BUG_ON(PageLRU(page)); |
16458 | - SetPageLRU(page); |
16459 | - list_del(&page->lru); |
16460 | - if (PageActive(page)) |
16461 | - add_page_to_active_list(zone, page); |
16462 | - else |
16463 | - add_page_to_inactive_list(zone, page); |
16464 | - if (!pagevec_add(&pvec, page)) { |
16465 | - spin_unlock_irq(&zone->lru_lock); |
16466 | - __pagevec_release(&pvec); |
16467 | - spin_lock_irq(&zone->lru_lock); |
16468 | - } |
16469 | - } |
16470 | + return_lru_pages(&page_list, zone, &pvec); |
16471 | } while (nr_scanned < max_scan); |
16472 | spin_unlock(&zone->lru_lock); |
16473 | done: |
16474 | @@ -1276,6 +1283,72 @@ out: |
16475 | return nr_reclaimed; |
16476 | } |
16477 | |
16478 | +struct lru_save { |
16479 | + struct zone *zone; |
16480 | + struct list_head active_list; |
16481 | + struct list_head inactive_list; |
16482 | + struct lru_save *next; |
16483 | +}; |
16484 | + |
16485 | +struct lru_save *lru_save_list; |
16486 | + |
16487 | +void unlink_lru_lists(void) |
16488 | +{ |
16489 | + struct zone *zone; |
16490 | + |
16491 | + for_each_zone(zone) { |
16492 | + struct lru_save *this; |
16493 | + unsigned long moved, scanned; |
16494 | + |
16495 | + if (!zone->spanned_pages) |
16496 | + continue; |
16497 | + |
16498 | + this = (struct lru_save *) |
16499 | + kzalloc(sizeof(struct lru_save), GFP_ATOMIC); |
16500 | + |
16501 | + BUG_ON(!this); |
16502 | + |
16503 | + this->next = lru_save_list; |
16504 | + lru_save_list = this; |
16505 | + |
16506 | + this->zone = zone; |
16507 | + |
16508 | + spin_lock_irq(&zone->lru_lock); |
16509 | + INIT_LIST_HEAD(&this->active_list); |
16510 | + INIT_LIST_HEAD(&this->inactive_list); |
16511 | + moved = isolate_lru_pages(zone_page_state(zone, NR_ACTIVE), |
16512 | + &zone->active_list, &this->active_list, |
16513 | + &scanned); |
16514 | + __mod_zone_page_state(zone, NR_ACTIVE, -moved); |
16515 | + moved = isolate_lru_pages(zone_page_state(zone, NR_INACTIVE), |
16516 | + &zone->inactive_list, &this->inactive_list, |
16517 | + &scanned); |
16518 | + __mod_zone_page_state(zone, NR_INACTIVE, -moved); |
16519 | + spin_unlock_irq(&zone->lru_lock); |
16520 | + } |
16521 | +} |
16522 | + |
16523 | +void relink_lru_lists(void) |
16524 | +{ |
16525 | + while(lru_save_list) { |
16526 | + struct lru_save *this = lru_save_list; |
16527 | + struct zone *zone = this->zone; |
16528 | + struct pagevec pvec; |
16529 | + |
16530 | + pagevec_init(&pvec, 1); |
16531 | + |
16532 | + lru_save_list = this->next; |
16533 | + |
16534 | + spin_lock_irq(&zone->lru_lock); |
16535 | + return_lru_pages(&this->active_list, zone, &pvec); |
16536 | + return_lru_pages(&this->inactive_list, zone, &pvec); |
16537 | + spin_unlock_irq(&zone->lru_lock); |
16538 | + pagevec_release(&pvec); |
16539 | + |
16540 | + kfree(this); |
16541 | + } |
16542 | +} |
16543 | + |
16544 | /* |
16545 | * The background pageout daemon, started as a kernel thread |
16546 | * from the init process. |
16547 | @@ -1323,8 +1396,6 @@ static int kswapd(void *p) |
16548 | for ( ; ; ) { |
16549 | unsigned long new_order; |
16550 | |
16551 | - try_to_freeze(); |
16552 | - |
16553 | /* kswapd has been busy so delay watermark_timer */ |
16554 | mod_timer(&pgdat->watermark_timer, jiffies + WT_EXPIRY); |
16555 | prepare_to_wait(&pgdat->kswapd_wait, &wait, TASK_INTERRUPTIBLE); |
16556 | @@ -1335,13 +1406,20 @@ static int kswapd(void *p) |
16557 | */ |
16558 | order = new_order; |
16559 | } else { |
16560 | set_user_nice(tsk, 0); |
16561 | - schedule(); |
16562 | + if (!freezing(current)) |
16563 | + schedule(); |
16564 | + |
16565 | order = pgdat->kswapd_max_order; |
16566 | } |
16567 | finish_wait(&pgdat->kswapd_wait, &wait); |
16568 | |
16569 | - balance_pgdat(pgdat, order); |
16570 | + if (!try_to_freeze()) { |
16571 | + /* We can speed up thawing tasks if we don't call |
16572 | + * balance_pgdat after returning from the refrigerator |
16573 | + */ |
16574 | + balance_pgdat(pgdat, order); |
16575 | + } |
16576 | } |
16577 | return 0; |
16578 | } |
16579 | @@ -1355,6 +1433,9 @@ void wakeup_kswapd(struct zone *zone, int order) |
16580 | if (!populated_zone(zone)) |
16581 | return; |
16582 | |
16583 | + if (freezer_is_on()) |
16584 | + return; |
16585 | + |
16586 | pgdat = zone->zone_pgdat; |
16587 | if (zone_watermark_ok(zone, order, zone->pages_low, 0, 0)) |
16588 | return; |
16589 | @@ -1368,6 +1449,91 @@ void wakeup_kswapd(struct zone *zone, int order) |
16590 | } |
16591 | |
16592 | #ifdef CONFIG_PM |
16593 | +void shrink_one_zone(struct zone *zone, int total_to_free) |
16594 | +{ |
16595 | + int prio; |
16596 | + unsigned long still_to_free = total_to_free; |
16597 | + struct scan_control sc = { |
16598 | + .gfp_mask = GFP_KERNEL, |
16599 | + .may_swap = 0, |
16600 | + .may_writepage = 1, |
16601 | + .mapped = vm_mapped, |
16602 | + }; |
16603 | + |
16604 | + if (!populated_zone(zone) || zone->all_unreclaimable) |
16605 | + return; |
16606 | + |
16607 | + if (still_to_free <= 0) |
16608 | + return; |
16609 | + |
16610 | + if (is_highmem(zone)) |
16611 | + sc.gfp_mask |= __GFP_HIGHMEM; |
16612 | + |
16613 | + for (prio = DEF_PRIORITY; prio >= 0; prio--) { |
16614 | + unsigned long to_free, just_freed, orig_size; |
16615 | + unsigned long old_nr_active; |
16616 | + |
16617 | + to_free = min(zone_page_state(zone, NR_ACTIVE) + |
16618 | + zone_page_state(zone, NR_INACTIVE), |
16619 | + still_to_free); |
16620 | + |
16621 | + if (to_free <= 0) |
16622 | + return; |
16623 | + |
16624 | + sc.swap_cluster_max = to_free - |
16625 | + zone_page_state(zone, NR_INACTIVE); |
16626 | + |
16627 | + do { |
16628 | + old_nr_active = zone_page_state(zone, NR_ACTIVE); |
16629 | + zone->nr_scan_active = sc.swap_cluster_max - 1; |
16630 | + shrink_active_list(sc.swap_cluster_max, zone, &sc, |
16631 | + prio); |
16632 | + zone->nr_scan_active = 0; |
16633 | + |
16634 | + sc.swap_cluster_max = to_free - zone_page_state(zone, |
16635 | + NR_INACTIVE); |
16636 | + |
16637 | + } while (sc.swap_cluster_max > 0 && |
16638 | + zone_page_state(zone, NR_ACTIVE) > old_nr_active); |
16639 | + |
16640 | + to_free = min(zone_page_state(zone, NR_ACTIVE) + |
16641 | + zone_page_state(zone, NR_INACTIVE), |
16642 | + still_to_free); |
16643 | + |
16644 | + do { |
16645 | + orig_size = zone_page_state(zone, NR_ACTIVE) + |
16646 | + zone_page_state(zone, NR_INACTIVE); |
16647 | + zone->nr_scan_inactive = to_free; |
16648 | + sc.swap_cluster_max = to_free; |
16649 | + shrink_inactive_list(to_free, zone, &sc); |
16650 | + just_freed = (orig_size - |
16651 | + (zone_page_state(zone, NR_ACTIVE) + |
16652 | + zone_page_state(zone, NR_INACTIVE))); |
16653 | + zone->nr_scan_inactive = 0; |
16654 | + still_to_free -= just_freed; |
16655 | + to_free -= just_freed; |
16656 | + } while (just_freed > 0 && still_to_free > 0); |
16657 | + }; |
16658 | + |
16659 | + while (still_to_free > 0) { |
16660 | + unsigned long nr_slab = global_page_state(NR_SLAB_RECLAIMABLE); |
16661 | + struct reclaim_state reclaim_state; |
16662 | + |
16663 | + if (nr_slab > still_to_free) |
16664 | + nr_slab = still_to_free; |
16665 | + |
16666 | + reclaim_state.reclaimed_slab = 0; |
16667 | + shrink_slab(nr_slab, sc.gfp_mask, nr_slab); |
16668 | + if (!reclaim_state.reclaimed_slab) |
16669 | + break; |
16670 | + |
16671 | + still_to_free -= reclaim_state.reclaimed_slab; |
16672 | + } |
16673 | + |
16674 | + return; |
16675 | +} |
16676 | + |
16677 | + |
16678 | /* |
16679 | * Helper function for shrink_all_memory(). Tries to reclaim 'nr_pages' pages |
16680 | * from LRU lists system-wide, for given pass and priority, and returns the |