Commit | Line | Data |
---|---|---|
61159a31 RW |
1 | /* |
2 | * linux/kernel/power/swap.c | |
3 | * | |
4 | * This file provides functions for reading the suspend image from | |
5 | * and writing it to a swap partition. | |
6 | * | |
a2531293 | 7 | * Copyright (C) 1998,2001-2005 Pavel Machek <pavel@ucw.cz> |
61159a31 | 8 | * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl> |
5a21d489 | 9 | * Copyright (C) 2010-2012 Bojan Smojver <bojan@rexursive.com> |
61159a31 RW |
10 | * |
11 | * This file is released under the GPLv2. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/module.h> | |
61159a31 | 16 | #include <linux/file.h> |
61159a31 RW |
17 | #include <linux/delay.h> |
18 | #include <linux/bitops.h> | |
19 | #include <linux/genhd.h> | |
20 | #include <linux/device.h> | |
61159a31 | 21 | #include <linux/bio.h> |
546e0d27 | 22 | #include <linux/blkdev.h> |
61159a31 RW |
23 | #include <linux/swap.h> |
24 | #include <linux/swapops.h> | |
25 | #include <linux/pm.h> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
f996fc96 BS |
27 | #include <linux/lzo.h> |
28 | #include <linux/vmalloc.h> | |
081a9d04 BS |
29 | #include <linux/cpumask.h> |
30 | #include <linux/atomic.h> | |
31 | #include <linux/kthread.h> | |
32 | #include <linux/crc32.h> | |
db597605 | 33 | #include <linux/ktime.h> |
61159a31 RW |
34 | |
35 | #include "power.h" | |
36 | ||
be8cd644 | 37 | #define HIBERNATE_SIG "S1SUSPEND" |
61159a31 | 38 | |
f6cf0545 JM |
39 | /* |
40 | * When reading an {un,}compressed image, we may restore pages in place, | |
41 | * in which case some architectures need these pages cleaning before they | |
42 | * can be executed. We don't know which pages these may be, so clean the lot. | |
43 | */ | |
44 | static bool clean_pages_on_read; | |
45 | static bool clean_pages_on_decompress; | |
46 | ||
51fb352b JS |
47 | /* |
48 | * The swap map is a data structure used for keeping track of each page | |
49 | * written to a swap partition. It consists of many swap_map_page | |
90133673 | 50 | * structures that contain each an array of MAP_PAGE_ENTRIES swap entries. |
51fb352b JS |
51 | * These structures are stored on the swap and linked together with the |
52 | * help of the .next_swap member. | |
53 | * | |
54 | * The swap map is created during suspend. The swap map pages are | |
55 | * allocated and populated one at a time, so we only need one memory | |
56 | * page to set up the entire structure. | |
57 | * | |
081a9d04 | 58 | * During resume we pick up all swap_map_page structures into a list. |
51fb352b JS |
59 | */ |
60 | ||
61 | #define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1) | |
62 | ||
f8262d47 BS |
63 | /* |
64 | * Number of free pages that are not high. | |
65 | */ | |
66 | static inline unsigned long low_free_pages(void) | |
67 | { | |
68 | return nr_free_pages() - nr_free_highpages(); | |
69 | } | |
70 | ||
71 | /* | |
72 | * Number of pages required to be kept free while writing the image. Always | |
73 | * half of all available low pages before the writing starts. | |
74 | */ | |
75 | static inline unsigned long reqd_free_pages(void) | |
76 | { | |
77 | return low_free_pages() / 2; | |
78 | } | |
79 | ||
51fb352b JS |
80 | struct swap_map_page { |
81 | sector_t entries[MAP_PAGE_ENTRIES]; | |
82 | sector_t next_swap; | |
83 | }; | |
84 | ||
081a9d04 BS |
85 | struct swap_map_page_list { |
86 | struct swap_map_page *map; | |
87 | struct swap_map_page_list *next; | |
88 | }; | |
89 | ||
51fb352b JS |
90 | /** |
91 | * The swap_map_handle structure is used for handling swap in | |
92 | * a file-alike way | |
93 | */ | |
94 | ||
95 | struct swap_map_handle { | |
96 | struct swap_map_page *cur; | |
081a9d04 | 97 | struct swap_map_page_list *maps; |
51fb352b JS |
98 | sector_t cur_swap; |
99 | sector_t first_sector; | |
100 | unsigned int k; | |
f8262d47 | 101 | unsigned long reqd_free_pages; |
081a9d04 | 102 | u32 crc32; |
51fb352b JS |
103 | }; |
104 | ||
1b29c164 | 105 | struct swsusp_header { |
081a9d04 BS |
106 | char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int) - |
107 | sizeof(u32)]; | |
108 | u32 crc32; | |
3aef83e0 | 109 | sector_t image; |
a634cc10 | 110 | unsigned int flags; /* Flags to pass to the "boot" kernel */ |
61159a31 RW |
111 | char orig_sig[10]; |
112 | char sig[10]; | |
52f5684c | 113 | } __packed; |
1b29c164 VG |
114 | |
115 | static struct swsusp_header *swsusp_header; | |
61159a31 | 116 | |
0414f2ec NC |
117 | /** |
118 | * The following functions are used for tracing the allocated | |
119 | * swap pages, so that they can be freed in case of an error. | |
120 | */ | |
121 | ||
122 | struct swsusp_extent { | |
123 | struct rb_node node; | |
124 | unsigned long start; | |
125 | unsigned long end; | |
126 | }; | |
127 | ||
128 | static struct rb_root swsusp_extents = RB_ROOT; | |
129 | ||
130 | static int swsusp_extents_insert(unsigned long swap_offset) | |
131 | { | |
132 | struct rb_node **new = &(swsusp_extents.rb_node); | |
133 | struct rb_node *parent = NULL; | |
134 | struct swsusp_extent *ext; | |
135 | ||
136 | /* Figure out where to put the new node */ | |
137 | while (*new) { | |
8316bd72 | 138 | ext = rb_entry(*new, struct swsusp_extent, node); |
0414f2ec NC |
139 | parent = *new; |
140 | if (swap_offset < ext->start) { | |
141 | /* Try to merge */ | |
142 | if (swap_offset == ext->start - 1) { | |
143 | ext->start--; | |
144 | return 0; | |
145 | } | |
146 | new = &((*new)->rb_left); | |
147 | } else if (swap_offset > ext->end) { | |
148 | /* Try to merge */ | |
149 | if (swap_offset == ext->end + 1) { | |
150 | ext->end++; | |
151 | return 0; | |
152 | } | |
153 | new = &((*new)->rb_right); | |
154 | } else { | |
155 | /* It already is in the tree */ | |
156 | return -EINVAL; | |
157 | } | |
158 | } | |
159 | /* Add the new node and rebalance the tree. */ | |
160 | ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL); | |
161 | if (!ext) | |
162 | return -ENOMEM; | |
163 | ||
164 | ext->start = swap_offset; | |
165 | ext->end = swap_offset; | |
166 | rb_link_node(&ext->node, parent, new); | |
167 | rb_insert_color(&ext->node, &swsusp_extents); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | /** | |
172 | * alloc_swapdev_block - allocate a swap page and register that it has | |
173 | * been allocated, so that it can be freed in case of an error. | |
174 | */ | |
175 | ||
176 | sector_t alloc_swapdev_block(int swap) | |
177 | { | |
178 | unsigned long offset; | |
179 | ||
910321ea | 180 | offset = swp_offset(get_swap_page_of_type(swap)); |
0414f2ec NC |
181 | if (offset) { |
182 | if (swsusp_extents_insert(offset)) | |
910321ea | 183 | swap_free(swp_entry(swap, offset)); |
0414f2ec NC |
184 | else |
185 | return swapdev_block(swap, offset); | |
186 | } | |
187 | return 0; | |
188 | } | |
189 | ||
190 | /** | |
191 | * free_all_swap_pages - free swap pages allocated for saving image data. | |
90133673 | 192 | * It also frees the extents used to register which swap entries had been |
0414f2ec NC |
193 | * allocated. |
194 | */ | |
195 | ||
196 | void free_all_swap_pages(int swap) | |
197 | { | |
198 | struct rb_node *node; | |
199 | ||
200 | while ((node = swsusp_extents.rb_node)) { | |
201 | struct swsusp_extent *ext; | |
202 | unsigned long offset; | |
203 | ||
47087eeb | 204 | ext = rb_entry(node, struct swsusp_extent, node); |
0414f2ec NC |
205 | rb_erase(node, &swsusp_extents); |
206 | for (offset = ext->start; offset <= ext->end; offset++) | |
910321ea | 207 | swap_free(swp_entry(swap, offset)); |
0414f2ec NC |
208 | |
209 | kfree(ext); | |
210 | } | |
211 | } | |
212 | ||
213 | int swsusp_swap_in_use(void) | |
214 | { | |
215 | return (swsusp_extents.rb_node != NULL); | |
216 | } | |
217 | ||
61159a31 | 218 | /* |
3fc6b34f | 219 | * General things |
61159a31 RW |
220 | */ |
221 | ||
222 | static unsigned short root_swap = 0xffff; | |
343df3c7 CH |
223 | static struct block_device *hib_resume_bdev; |
224 | ||
225 | struct hib_bio_batch { | |
226 | atomic_t count; | |
227 | wait_queue_head_t wait; | |
4e4cbee9 | 228 | blk_status_t error; |
343df3c7 CH |
229 | }; |
230 | ||
231 | static void hib_init_batch(struct hib_bio_batch *hb) | |
232 | { | |
233 | atomic_set(&hb->count, 0); | |
234 | init_waitqueue_head(&hb->wait); | |
4e4cbee9 | 235 | hb->error = BLK_STS_OK; |
343df3c7 CH |
236 | } |
237 | ||
4246a0b6 | 238 | static void hib_end_io(struct bio *bio) |
343df3c7 CH |
239 | { |
240 | struct hib_bio_batch *hb = bio->bi_private; | |
343df3c7 CH |
241 | struct page *page = bio->bi_io_vec[0].bv_page; |
242 | ||
4e4cbee9 | 243 | if (bio->bi_status) { |
343df3c7 | 244 | printk(KERN_ALERT "Read-error on swap-device (%u:%u:%Lu)\n", |
74d46992 | 245 | MAJOR(bio_dev(bio)), MINOR(bio_dev(bio)), |
343df3c7 | 246 | (unsigned long long)bio->bi_iter.bi_sector); |
343df3c7 CH |
247 | } |
248 | ||
249 | if (bio_data_dir(bio) == WRITE) | |
250 | put_page(page); | |
f6cf0545 JM |
251 | else if (clean_pages_on_read) |
252 | flush_icache_range((unsigned long)page_address(page), | |
253 | (unsigned long)page_address(page) + PAGE_SIZE); | |
343df3c7 | 254 | |
4e4cbee9 CH |
255 | if (bio->bi_status && !hb->error) |
256 | hb->error = bio->bi_status; | |
343df3c7 CH |
257 | if (atomic_dec_and_test(&hb->count)) |
258 | wake_up(&hb->wait); | |
259 | ||
260 | bio_put(bio); | |
261 | } | |
262 | ||
162b99e3 | 263 | static int hib_submit_io(int op, int op_flags, pgoff_t page_off, void *addr, |
343df3c7 CH |
264 | struct hib_bio_batch *hb) |
265 | { | |
266 | struct page *page = virt_to_page(addr); | |
267 | struct bio *bio; | |
268 | int error = 0; | |
269 | ||
71baba4b | 270 | bio = bio_alloc(__GFP_RECLAIM | __GFP_HIGH, 1); |
343df3c7 | 271 | bio->bi_iter.bi_sector = page_off * (PAGE_SIZE >> 9); |
74d46992 | 272 | bio_set_dev(bio, hib_resume_bdev); |
162b99e3 | 273 | bio_set_op_attrs(bio, op, op_flags); |
343df3c7 CH |
274 | |
275 | if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { | |
276 | printk(KERN_ERR "PM: Adding page to bio failed at %llu\n", | |
277 | (unsigned long long)bio->bi_iter.bi_sector); | |
278 | bio_put(bio); | |
279 | return -EFAULT; | |
280 | } | |
281 | ||
282 | if (hb) { | |
283 | bio->bi_end_io = hib_end_io; | |
284 | bio->bi_private = hb; | |
285 | atomic_inc(&hb->count); | |
4e49ea4a | 286 | submit_bio(bio); |
343df3c7 | 287 | } else { |
4e49ea4a | 288 | error = submit_bio_wait(bio); |
343df3c7 CH |
289 | bio_put(bio); |
290 | } | |
291 | ||
292 | return error; | |
293 | } | |
294 | ||
4e4cbee9 | 295 | static blk_status_t hib_wait_io(struct hib_bio_batch *hb) |
343df3c7 CH |
296 | { |
297 | wait_event(hb->wait, atomic_read(&hb->count) == 0); | |
4e4cbee9 | 298 | return blk_status_to_errno(hb->error); |
343df3c7 | 299 | } |
3fc6b34f | 300 | |
3fc6b34f RW |
301 | /* |
302 | * Saving part | |
303 | */ | |
61159a31 | 304 | |
51fb352b | 305 | static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags) |
61159a31 RW |
306 | { |
307 | int error; | |
308 | ||
70fd7614 | 309 | hib_submit_io(REQ_OP_READ, 0, swsusp_resume_block, |
162b99e3 | 310 | swsusp_header, NULL); |
1b29c164 VG |
311 | if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) || |
312 | !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) { | |
313 | memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10); | |
3624eb04 | 314 | memcpy(swsusp_header->sig, HIBERNATE_SIG, 10); |
51fb352b | 315 | swsusp_header->image = handle->first_sector; |
a634cc10 | 316 | swsusp_header->flags = flags; |
081a9d04 BS |
317 | if (flags & SF_CRC32_MODE) |
318 | swsusp_header->crc32 = handle->crc32; | |
70fd7614 | 319 | error = hib_submit_io(REQ_OP_WRITE, REQ_SYNC, |
162b99e3 | 320 | swsusp_resume_block, swsusp_header, NULL); |
61159a31 | 321 | } else { |
23976728 | 322 | printk(KERN_ERR "PM: Swap header not found!\n"); |
61159a31 RW |
323 | error = -ENODEV; |
324 | } | |
325 | return error; | |
326 | } | |
327 | ||
328 | /** | |
329 | * swsusp_swap_check - check if the resume device is a swap device | |
330 | * and get its index (if so) | |
6f612af5 JS |
331 | * |
332 | * This is called before saving image | |
61159a31 | 333 | */ |
6f612af5 | 334 | static int swsusp_swap_check(void) |
61159a31 | 335 | { |
3aef83e0 RW |
336 | int res; |
337 | ||
7bf23687 | 338 | res = swap_type_of(swsusp_resume_device, swsusp_resume_block, |
8a0d613f | 339 | &hib_resume_bdev); |
3aef83e0 RW |
340 | if (res < 0) |
341 | return res; | |
342 | ||
343 | root_swap = res; | |
e525fd89 | 344 | res = blkdev_get(hib_resume_bdev, FMODE_WRITE, NULL); |
7bf23687 RW |
345 | if (res) |
346 | return res; | |
3aef83e0 | 347 | |
8a0d613f | 348 | res = set_blocksize(hib_resume_bdev, PAGE_SIZE); |
3aef83e0 | 349 | if (res < 0) |
8a0d613f | 350 | blkdev_put(hib_resume_bdev, FMODE_WRITE); |
61159a31 | 351 | |
fe12c00d CY |
352 | /* |
353 | * Update the resume device to the one actually used, | |
354 | * so the test_resume mode can use it in case it is | |
355 | * invoked from hibernate() to test the snapshot. | |
356 | */ | |
357 | swsusp_resume_device = hib_resume_bdev->bd_dev; | |
61159a31 RW |
358 | return res; |
359 | } | |
360 | ||
361 | /** | |
362 | * write_page - Write one page to given swap location. | |
363 | * @buf: Address we're writing. | |
364 | * @offset: Offset of the swap page we're writing to. | |
343df3c7 | 365 | * @hb: bio completion batch |
61159a31 RW |
366 | */ |
367 | ||
343df3c7 | 368 | static int write_page(void *buf, sector_t offset, struct hib_bio_batch *hb) |
61159a31 | 369 | { |
3aef83e0 | 370 | void *src; |
081a9d04 | 371 | int ret; |
3aef83e0 RW |
372 | |
373 | if (!offset) | |
374 | return -ENOSPC; | |
375 | ||
343df3c7 | 376 | if (hb) { |
71baba4b | 377 | src = (void *)__get_free_page(__GFP_RECLAIM | __GFP_NOWARN | |
5a21d489 | 378 | __GFP_NORETRY); |
3aef83e0 | 379 | if (src) { |
3ecb01df | 380 | copy_page(src, buf); |
3aef83e0 | 381 | } else { |
343df3c7 | 382 | ret = hib_wait_io(hb); /* Free pages */ |
081a9d04 BS |
383 | if (ret) |
384 | return ret; | |
71baba4b | 385 | src = (void *)__get_free_page(__GFP_RECLAIM | |
5a21d489 BS |
386 | __GFP_NOWARN | |
387 | __GFP_NORETRY); | |
081a9d04 BS |
388 | if (src) { |
389 | copy_page(src, buf); | |
390 | } else { | |
391 | WARN_ON_ONCE(1); | |
343df3c7 | 392 | hb = NULL; /* Go synchronous */ |
081a9d04 BS |
393 | src = buf; |
394 | } | |
ab954160 | 395 | } |
3aef83e0 RW |
396 | } else { |
397 | src = buf; | |
61159a31 | 398 | } |
70fd7614 | 399 | return hib_submit_io(REQ_OP_WRITE, REQ_SYNC, offset, src, hb); |
61159a31 RW |
400 | } |
401 | ||
61159a31 RW |
402 | static void release_swap_writer(struct swap_map_handle *handle) |
403 | { | |
404 | if (handle->cur) | |
405 | free_page((unsigned long)handle->cur); | |
406 | handle->cur = NULL; | |
61159a31 RW |
407 | } |
408 | ||
409 | static int get_swap_writer(struct swap_map_handle *handle) | |
410 | { | |
6f612af5 JS |
411 | int ret; |
412 | ||
413 | ret = swsusp_swap_check(); | |
414 | if (ret) { | |
415 | if (ret != -ENOSPC) | |
416 | printk(KERN_ERR "PM: Cannot find swap device, try " | |
417 | "swapon -a.\n"); | |
418 | return ret; | |
419 | } | |
61159a31 | 420 | handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL); |
6f612af5 JS |
421 | if (!handle->cur) { |
422 | ret = -ENOMEM; | |
423 | goto err_close; | |
424 | } | |
d1d241cc | 425 | handle->cur_swap = alloc_swapdev_block(root_swap); |
61159a31 | 426 | if (!handle->cur_swap) { |
6f612af5 JS |
427 | ret = -ENOSPC; |
428 | goto err_rel; | |
61159a31 RW |
429 | } |
430 | handle->k = 0; | |
f8262d47 | 431 | handle->reqd_free_pages = reqd_free_pages(); |
51fb352b | 432 | handle->first_sector = handle->cur_swap; |
61159a31 | 433 | return 0; |
6f612af5 JS |
434 | err_rel: |
435 | release_swap_writer(handle); | |
436 | err_close: | |
437 | swsusp_close(FMODE_WRITE); | |
438 | return ret; | |
61159a31 RW |
439 | } |
440 | ||
ab954160 | 441 | static int swap_write_page(struct swap_map_handle *handle, void *buf, |
343df3c7 | 442 | struct hib_bio_batch *hb) |
ab954160 AM |
443 | { |
444 | int error = 0; | |
3aef83e0 | 445 | sector_t offset; |
61159a31 RW |
446 | |
447 | if (!handle->cur) | |
448 | return -EINVAL; | |
d1d241cc | 449 | offset = alloc_swapdev_block(root_swap); |
343df3c7 | 450 | error = write_page(buf, offset, hb); |
61159a31 RW |
451 | if (error) |
452 | return error; | |
453 | handle->cur->entries[handle->k++] = offset; | |
454 | if (handle->k >= MAP_PAGE_ENTRIES) { | |
d1d241cc | 455 | offset = alloc_swapdev_block(root_swap); |
61159a31 RW |
456 | if (!offset) |
457 | return -ENOSPC; | |
458 | handle->cur->next_swap = offset; | |
343df3c7 | 459 | error = write_page(handle->cur, handle->cur_swap, hb); |
61159a31 | 460 | if (error) |
ab954160 | 461 | goto out; |
3ecb01df | 462 | clear_page(handle->cur); |
61159a31 RW |
463 | handle->cur_swap = offset; |
464 | handle->k = 0; | |
5a21d489 | 465 | |
343df3c7 CH |
466 | if (hb && low_free_pages() <= handle->reqd_free_pages) { |
467 | error = hib_wait_io(hb); | |
5a21d489 BS |
468 | if (error) |
469 | goto out; | |
470 | /* | |
471 | * Recalculate the number of required free pages, to | |
472 | * make sure we never take more than half. | |
473 | */ | |
474 | handle->reqd_free_pages = reqd_free_pages(); | |
475 | } | |
081a9d04 | 476 | } |
59a49335 | 477 | out: |
ab954160 | 478 | return error; |
61159a31 RW |
479 | } |
480 | ||
481 | static int flush_swap_writer(struct swap_map_handle *handle) | |
482 | { | |
483 | if (handle->cur && handle->cur_swap) | |
ab954160 | 484 | return write_page(handle->cur, handle->cur_swap, NULL); |
61159a31 RW |
485 | else |
486 | return -EINVAL; | |
487 | } | |
488 | ||
6f612af5 JS |
489 | static int swap_writer_finish(struct swap_map_handle *handle, |
490 | unsigned int flags, int error) | |
491 | { | |
492 | if (!error) { | |
493 | flush_swap_writer(handle); | |
494 | printk(KERN_INFO "PM: S"); | |
495 | error = mark_swapfiles(handle, flags); | |
496 | printk("|\n"); | |
497 | } | |
498 | ||
499 | if (error) | |
500 | free_all_swap_pages(root_swap); | |
501 | release_swap_writer(handle); | |
502 | swsusp_close(FMODE_WRITE); | |
503 | ||
504 | return error; | |
505 | } | |
506 | ||
f996fc96 BS |
507 | /* We need to remember how much compressed data we need to read. */ |
508 | #define LZO_HEADER sizeof(size_t) | |
509 | ||
510 | /* Number of pages/bytes we'll compress at one time. */ | |
511 | #define LZO_UNC_PAGES 32 | |
512 | #define LZO_UNC_SIZE (LZO_UNC_PAGES * PAGE_SIZE) | |
513 | ||
514 | /* Number of pages/bytes we need for compressed data (worst case). */ | |
515 | #define LZO_CMP_PAGES DIV_ROUND_UP(lzo1x_worst_compress(LZO_UNC_SIZE) + \ | |
516 | LZO_HEADER, PAGE_SIZE) | |
517 | #define LZO_CMP_SIZE (LZO_CMP_PAGES * PAGE_SIZE) | |
518 | ||
081a9d04 BS |
519 | /* Maximum number of threads for compression/decompression. */ |
520 | #define LZO_THREADS 3 | |
521 | ||
5a21d489 BS |
522 | /* Minimum/maximum number of pages for read buffering. */ |
523 | #define LZO_MIN_RD_PAGES 1024 | |
524 | #define LZO_MAX_RD_PAGES 8192 | |
081a9d04 BS |
525 | |
526 | ||
61159a31 RW |
527 | /** |
528 | * save_image - save the suspend image data | |
529 | */ | |
530 | ||
531 | static int save_image(struct swap_map_handle *handle, | |
532 | struct snapshot_handle *snapshot, | |
3a4f7577 | 533 | unsigned int nr_to_write) |
61159a31 RW |
534 | { |
535 | unsigned int m; | |
536 | int ret; | |
3a4f7577 | 537 | int nr_pages; |
ab954160 | 538 | int err2; |
343df3c7 | 539 | struct hib_bio_batch hb; |
db597605 TR |
540 | ktime_t start; |
541 | ktime_t stop; | |
61159a31 | 542 | |
343df3c7 CH |
543 | hib_init_batch(&hb); |
544 | ||
d8150d35 | 545 | printk(KERN_INFO "PM: Saving image data pages (%u pages)...\n", |
23976728 | 546 | nr_to_write); |
d8150d35 | 547 | m = nr_to_write / 10; |
61159a31 RW |
548 | if (!m) |
549 | m = 1; | |
550 | nr_pages = 0; | |
db597605 | 551 | start = ktime_get(); |
4ff277f9 | 552 | while (1) { |
d3c1b24c | 553 | ret = snapshot_read_next(snapshot); |
4ff277f9 JS |
554 | if (ret <= 0) |
555 | break; | |
343df3c7 | 556 | ret = swap_write_page(handle, data_of(*snapshot), &hb); |
4ff277f9 JS |
557 | if (ret) |
558 | break; | |
559 | if (!(nr_pages % m)) | |
d8150d35 BS |
560 | printk(KERN_INFO "PM: Image saving progress: %3d%%\n", |
561 | nr_pages / m * 10); | |
4ff277f9 JS |
562 | nr_pages++; |
563 | } | |
343df3c7 | 564 | err2 = hib_wait_io(&hb); |
db597605 | 565 | stop = ktime_get(); |
4ff277f9 JS |
566 | if (!ret) |
567 | ret = err2; | |
568 | if (!ret) | |
d8150d35 | 569 | printk(KERN_INFO "PM: Image saving done.\n"); |
db597605 | 570 | swsusp_show_speed(start, stop, nr_to_write, "Wrote"); |
4ff277f9 | 571 | return ret; |
61159a31 RW |
572 | } |
573 | ||
081a9d04 BS |
574 | /** |
575 | * Structure used for CRC32. | |
576 | */ | |
577 | struct crc_data { | |
578 | struct task_struct *thr; /* thread */ | |
579 | atomic_t ready; /* ready to start flag */ | |
580 | atomic_t stop; /* ready to stop flag */ | |
581 | unsigned run_threads; /* nr current threads */ | |
582 | wait_queue_head_t go; /* start crc update */ | |
583 | wait_queue_head_t done; /* crc update done */ | |
584 | u32 *crc32; /* points to handle's crc32 */ | |
585 | size_t *unc_len[LZO_THREADS]; /* uncompressed lengths */ | |
586 | unsigned char *unc[LZO_THREADS]; /* uncompressed data */ | |
587 | }; | |
588 | ||
589 | /** | |
590 | * CRC32 update function that runs in its own thread. | |
591 | */ | |
592 | static int crc32_threadfn(void *data) | |
593 | { | |
594 | struct crc_data *d = data; | |
595 | unsigned i; | |
596 | ||
597 | while (1) { | |
598 | wait_event(d->go, atomic_read(&d->ready) || | |
599 | kthread_should_stop()); | |
600 | if (kthread_should_stop()) { | |
601 | d->thr = NULL; | |
602 | atomic_set(&d->stop, 1); | |
603 | wake_up(&d->done); | |
604 | break; | |
605 | } | |
606 | atomic_set(&d->ready, 0); | |
607 | ||
608 | for (i = 0; i < d->run_threads; i++) | |
609 | *d->crc32 = crc32_le(*d->crc32, | |
610 | d->unc[i], *d->unc_len[i]); | |
611 | atomic_set(&d->stop, 1); | |
612 | wake_up(&d->done); | |
613 | } | |
614 | return 0; | |
615 | } | |
616 | /** | |
617 | * Structure used for LZO data compression. | |
618 | */ | |
619 | struct cmp_data { | |
620 | struct task_struct *thr; /* thread */ | |
621 | atomic_t ready; /* ready to start flag */ | |
622 | atomic_t stop; /* ready to stop flag */ | |
623 | int ret; /* return code */ | |
624 | wait_queue_head_t go; /* start compression */ | |
625 | wait_queue_head_t done; /* compression done */ | |
626 | size_t unc_len; /* uncompressed length */ | |
627 | size_t cmp_len; /* compressed length */ | |
628 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ | |
629 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ | |
630 | unsigned char wrk[LZO1X_1_MEM_COMPRESS]; /* compression workspace */ | |
631 | }; | |
632 | ||
633 | /** | |
634 | * Compression function that runs in its own thread. | |
635 | */ | |
636 | static int lzo_compress_threadfn(void *data) | |
637 | { | |
638 | struct cmp_data *d = data; | |
639 | ||
640 | while (1) { | |
641 | wait_event(d->go, atomic_read(&d->ready) || | |
642 | kthread_should_stop()); | |
643 | if (kthread_should_stop()) { | |
644 | d->thr = NULL; | |
645 | d->ret = -1; | |
646 | atomic_set(&d->stop, 1); | |
647 | wake_up(&d->done); | |
648 | break; | |
649 | } | |
650 | atomic_set(&d->ready, 0); | |
651 | ||
652 | d->ret = lzo1x_1_compress(d->unc, d->unc_len, | |
653 | d->cmp + LZO_HEADER, &d->cmp_len, | |
654 | d->wrk); | |
655 | atomic_set(&d->stop, 1); | |
656 | wake_up(&d->done); | |
657 | } | |
658 | return 0; | |
659 | } | |
f996fc96 BS |
660 | |
661 | /** | |
662 | * save_image_lzo - Save the suspend image data compressed with LZO. | |
057b0a75 | 663 | * @handle: Swap map handle to use for saving the image. |
f996fc96 BS |
664 | * @snapshot: Image to read data from. |
665 | * @nr_to_write: Number of pages to save. | |
666 | */ | |
667 | static int save_image_lzo(struct swap_map_handle *handle, | |
668 | struct snapshot_handle *snapshot, | |
669 | unsigned int nr_to_write) | |
670 | { | |
671 | unsigned int m; | |
672 | int ret = 0; | |
673 | int nr_pages; | |
674 | int err2; | |
343df3c7 | 675 | struct hib_bio_batch hb; |
db597605 TR |
676 | ktime_t start; |
677 | ktime_t stop; | |
081a9d04 BS |
678 | size_t off; |
679 | unsigned thr, run_threads, nr_threads; | |
680 | unsigned char *page = NULL; | |
681 | struct cmp_data *data = NULL; | |
682 | struct crc_data *crc = NULL; | |
683 | ||
343df3c7 CH |
684 | hib_init_batch(&hb); |
685 | ||
081a9d04 BS |
686 | /* |
687 | * We'll limit the number of threads for compression to limit memory | |
688 | * footprint. | |
689 | */ | |
690 | nr_threads = num_online_cpus() - 1; | |
691 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); | |
f996fc96 | 692 | |
71baba4b | 693 | page = (void *)__get_free_page(__GFP_RECLAIM | __GFP_HIGH); |
f996fc96 BS |
694 | if (!page) { |
695 | printk(KERN_ERR "PM: Failed to allocate LZO page\n"); | |
081a9d04 BS |
696 | ret = -ENOMEM; |
697 | goto out_clean; | |
f996fc96 BS |
698 | } |
699 | ||
081a9d04 BS |
700 | data = vmalloc(sizeof(*data) * nr_threads); |
701 | if (!data) { | |
702 | printk(KERN_ERR "PM: Failed to allocate LZO data\n"); | |
703 | ret = -ENOMEM; | |
704 | goto out_clean; | |
f996fc96 | 705 | } |
081a9d04 BS |
706 | for (thr = 0; thr < nr_threads; thr++) |
707 | memset(&data[thr], 0, offsetof(struct cmp_data, go)); | |
f996fc96 | 708 | |
081a9d04 BS |
709 | crc = kmalloc(sizeof(*crc), GFP_KERNEL); |
710 | if (!crc) { | |
711 | printk(KERN_ERR "PM: Failed to allocate crc\n"); | |
712 | ret = -ENOMEM; | |
713 | goto out_clean; | |
714 | } | |
715 | memset(crc, 0, offsetof(struct crc_data, go)); | |
716 | ||
717 | /* | |
718 | * Start the compression threads. | |
719 | */ | |
720 | for (thr = 0; thr < nr_threads; thr++) { | |
721 | init_waitqueue_head(&data[thr].go); | |
722 | init_waitqueue_head(&data[thr].done); | |
723 | ||
724 | data[thr].thr = kthread_run(lzo_compress_threadfn, | |
725 | &data[thr], | |
726 | "image_compress/%u", thr); | |
727 | if (IS_ERR(data[thr].thr)) { | |
728 | data[thr].thr = NULL; | |
729 | printk(KERN_ERR | |
730 | "PM: Cannot start compression threads\n"); | |
731 | ret = -ENOMEM; | |
732 | goto out_clean; | |
733 | } | |
f996fc96 BS |
734 | } |
735 | ||
081a9d04 BS |
736 | /* |
737 | * Start the CRC32 thread. | |
738 | */ | |
739 | init_waitqueue_head(&crc->go); | |
740 | init_waitqueue_head(&crc->done); | |
741 | ||
742 | handle->crc32 = 0; | |
743 | crc->crc32 = &handle->crc32; | |
744 | for (thr = 0; thr < nr_threads; thr++) { | |
745 | crc->unc[thr] = data[thr].unc; | |
746 | crc->unc_len[thr] = &data[thr].unc_len; | |
747 | } | |
748 | ||
749 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); | |
750 | if (IS_ERR(crc->thr)) { | |
751 | crc->thr = NULL; | |
752 | printk(KERN_ERR "PM: Cannot start CRC32 thread\n"); | |
753 | ret = -ENOMEM; | |
754 | goto out_clean; | |
f996fc96 BS |
755 | } |
756 | ||
5a21d489 BS |
757 | /* |
758 | * Adjust the number of required free pages after all allocations have | |
759 | * been done. We don't want to run out of pages when writing. | |
760 | */ | |
761 | handle->reqd_free_pages = reqd_free_pages(); | |
762 | ||
f996fc96 | 763 | printk(KERN_INFO |
081a9d04 | 764 | "PM: Using %u thread(s) for compression.\n" |
d8150d35 | 765 | "PM: Compressing and saving image data (%u pages)...\n", |
081a9d04 | 766 | nr_threads, nr_to_write); |
d8150d35 | 767 | m = nr_to_write / 10; |
f996fc96 BS |
768 | if (!m) |
769 | m = 1; | |
770 | nr_pages = 0; | |
db597605 | 771 | start = ktime_get(); |
f996fc96 | 772 | for (;;) { |
081a9d04 BS |
773 | for (thr = 0; thr < nr_threads; thr++) { |
774 | for (off = 0; off < LZO_UNC_SIZE; off += PAGE_SIZE) { | |
775 | ret = snapshot_read_next(snapshot); | |
776 | if (ret < 0) | |
777 | goto out_finish; | |
778 | ||
779 | if (!ret) | |
780 | break; | |
781 | ||
782 | memcpy(data[thr].unc + off, | |
783 | data_of(*snapshot), PAGE_SIZE); | |
784 | ||
785 | if (!(nr_pages % m)) | |
d8150d35 BS |
786 | printk(KERN_INFO |
787 | "PM: Image saving progress: " | |
788 | "%3d%%\n", | |
789 | nr_pages / m * 10); | |
081a9d04 BS |
790 | nr_pages++; |
791 | } | |
792 | if (!off) | |
f996fc96 BS |
793 | break; |
794 | ||
081a9d04 | 795 | data[thr].unc_len = off; |
f996fc96 | 796 | |
081a9d04 BS |
797 | atomic_set(&data[thr].ready, 1); |
798 | wake_up(&data[thr].go); | |
f996fc96 BS |
799 | } |
800 | ||
081a9d04 | 801 | if (!thr) |
f996fc96 BS |
802 | break; |
803 | ||
081a9d04 BS |
804 | crc->run_threads = thr; |
805 | atomic_set(&crc->ready, 1); | |
806 | wake_up(&crc->go); | |
f996fc96 | 807 | |
081a9d04 BS |
808 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
809 | wait_event(data[thr].done, | |
810 | atomic_read(&data[thr].stop)); | |
811 | atomic_set(&data[thr].stop, 0); | |
f996fc96 | 812 | |
081a9d04 | 813 | ret = data[thr].ret; |
f996fc96 | 814 | |
081a9d04 BS |
815 | if (ret < 0) { |
816 | printk(KERN_ERR "PM: LZO compression failed\n"); | |
817 | goto out_finish; | |
818 | } | |
f996fc96 | 819 | |
081a9d04 BS |
820 | if (unlikely(!data[thr].cmp_len || |
821 | data[thr].cmp_len > | |
822 | lzo1x_worst_compress(data[thr].unc_len))) { | |
823 | printk(KERN_ERR | |
824 | "PM: Invalid LZO compressed length\n"); | |
825 | ret = -1; | |
f996fc96 | 826 | goto out_finish; |
081a9d04 BS |
827 | } |
828 | ||
829 | *(size_t *)data[thr].cmp = data[thr].cmp_len; | |
830 | ||
831 | /* | |
832 | * Given we are writing one page at a time to disk, we | |
833 | * copy that much from the buffer, although the last | |
834 | * bit will likely be smaller than full page. This is | |
835 | * OK - we saved the length of the compressed data, so | |
836 | * any garbage at the end will be discarded when we | |
837 | * read it. | |
838 | */ | |
839 | for (off = 0; | |
840 | off < LZO_HEADER + data[thr].cmp_len; | |
841 | off += PAGE_SIZE) { | |
842 | memcpy(page, data[thr].cmp + off, PAGE_SIZE); | |
843 | ||
343df3c7 | 844 | ret = swap_write_page(handle, page, &hb); |
081a9d04 BS |
845 | if (ret) |
846 | goto out_finish; | |
847 | } | |
f996fc96 | 848 | } |
081a9d04 BS |
849 | |
850 | wait_event(crc->done, atomic_read(&crc->stop)); | |
851 | atomic_set(&crc->stop, 0); | |
f996fc96 BS |
852 | } |
853 | ||
854 | out_finish: | |
343df3c7 | 855 | err2 = hib_wait_io(&hb); |
db597605 | 856 | stop = ktime_get(); |
f996fc96 BS |
857 | if (!ret) |
858 | ret = err2; | |
d8150d35 BS |
859 | if (!ret) |
860 | printk(KERN_INFO "PM: Image saving done.\n"); | |
db597605 | 861 | swsusp_show_speed(start, stop, nr_to_write, "Wrote"); |
081a9d04 BS |
862 | out_clean: |
863 | if (crc) { | |
864 | if (crc->thr) | |
865 | kthread_stop(crc->thr); | |
866 | kfree(crc); | |
867 | } | |
868 | if (data) { | |
869 | for (thr = 0; thr < nr_threads; thr++) | |
870 | if (data[thr].thr) | |
871 | kthread_stop(data[thr].thr); | |
872 | vfree(data); | |
873 | } | |
874 | if (page) free_page((unsigned long)page); | |
f996fc96 BS |
875 | |
876 | return ret; | |
877 | } | |
878 | ||
61159a31 RW |
879 | /** |
880 | * enough_swap - Make sure we have enough swap to save the image. | |
881 | * | |
882 | * Returns TRUE or FALSE after checking the total amount of swap | |
883 | * space avaiable from the resume partition. | |
884 | */ | |
885 | ||
f996fc96 | 886 | static int enough_swap(unsigned int nr_pages, unsigned int flags) |
61159a31 RW |
887 | { |
888 | unsigned int free_swap = count_swap_pages(root_swap, 1); | |
f996fc96 | 889 | unsigned int required; |
61159a31 | 890 | |
23976728 | 891 | pr_debug("PM: Free swap pages: %u\n", free_swap); |
f996fc96 | 892 | |
ee34a370 | 893 | required = PAGES_FOR_IO + nr_pages; |
f996fc96 | 894 | return free_swap > required; |
61159a31 RW |
895 | } |
896 | ||
897 | /** | |
898 | * swsusp_write - Write entire image and metadata. | |
a634cc10 | 899 | * @flags: flags to pass to the "boot" kernel in the image header |
61159a31 RW |
900 | * |
901 | * It is important _NOT_ to umount filesystems at this point. We want | |
902 | * them synced (in case something goes wrong) but we DO not want to mark | |
903 | * filesystem clean: it is not. (And it does not matter, if we resume | |
904 | * correctly, we'll mark system clean, anyway.) | |
905 | */ | |
906 | ||
a634cc10 | 907 | int swsusp_write(unsigned int flags) |
61159a31 RW |
908 | { |
909 | struct swap_map_handle handle; | |
910 | struct snapshot_handle snapshot; | |
911 | struct swsusp_info *header; | |
6f612af5 | 912 | unsigned long pages; |
61159a31 RW |
913 | int error; |
914 | ||
6f612af5 JS |
915 | pages = snapshot_get_image_size(); |
916 | error = get_swap_writer(&handle); | |
3aef83e0 | 917 | if (error) { |
6f612af5 | 918 | printk(KERN_ERR "PM: Cannot get swap writer\n"); |
61159a31 RW |
919 | return error; |
920 | } | |
ee34a370 BS |
921 | if (flags & SF_NOCOMPRESS_MODE) { |
922 | if (!enough_swap(pages, flags)) { | |
923 | printk(KERN_ERR "PM: Not enough free swap\n"); | |
924 | error = -ENOSPC; | |
925 | goto out_finish; | |
926 | } | |
6f612af5 | 927 | } |
61159a31 | 928 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 929 | error = snapshot_read_next(&snapshot); |
3aef83e0 RW |
930 | if (error < PAGE_SIZE) { |
931 | if (error >= 0) | |
932 | error = -EFAULT; | |
933 | ||
6f612af5 | 934 | goto out_finish; |
3aef83e0 | 935 | } |
61159a31 | 936 | header = (struct swsusp_info *)data_of(snapshot); |
6f612af5 | 937 | error = swap_write_page(&handle, header, NULL); |
f996fc96 BS |
938 | if (!error) { |
939 | error = (flags & SF_NOCOMPRESS_MODE) ? | |
940 | save_image(&handle, &snapshot, pages - 1) : | |
941 | save_image_lzo(&handle, &snapshot, pages - 1); | |
942 | } | |
6f612af5 JS |
943 | out_finish: |
944 | error = swap_writer_finish(&handle, flags, error); | |
61159a31 RW |
945 | return error; |
946 | } | |
947 | ||
61159a31 RW |
948 | /** |
949 | * The following functions allow us to read data using a swap map | |
950 | * in a file-alike way | |
951 | */ | |
952 | ||
953 | static void release_swap_reader(struct swap_map_handle *handle) | |
954 | { | |
081a9d04 BS |
955 | struct swap_map_page_list *tmp; |
956 | ||
957 | while (handle->maps) { | |
958 | if (handle->maps->map) | |
959 | free_page((unsigned long)handle->maps->map); | |
960 | tmp = handle->maps; | |
961 | handle->maps = handle->maps->next; | |
962 | kfree(tmp); | |
963 | } | |
61159a31 RW |
964 | handle->cur = NULL; |
965 | } | |
966 | ||
6f612af5 JS |
967 | static int get_swap_reader(struct swap_map_handle *handle, |
968 | unsigned int *flags_p) | |
61159a31 RW |
969 | { |
970 | int error; | |
081a9d04 BS |
971 | struct swap_map_page_list *tmp, *last; |
972 | sector_t offset; | |
61159a31 | 973 | |
6f612af5 JS |
974 | *flags_p = swsusp_header->flags; |
975 | ||
976 | if (!swsusp_header->image) /* how can this happen? */ | |
61159a31 | 977 | return -EINVAL; |
3aef83e0 | 978 | |
081a9d04 BS |
979 | handle->cur = NULL; |
980 | last = handle->maps = NULL; | |
981 | offset = swsusp_header->image; | |
982 | while (offset) { | |
983 | tmp = kmalloc(sizeof(*handle->maps), GFP_KERNEL); | |
984 | if (!tmp) { | |
985 | release_swap_reader(handle); | |
986 | return -ENOMEM; | |
987 | } | |
988 | memset(tmp, 0, sizeof(*tmp)); | |
989 | if (!handle->maps) | |
990 | handle->maps = tmp; | |
991 | if (last) | |
992 | last->next = tmp; | |
993 | last = tmp; | |
994 | ||
995 | tmp->map = (struct swap_map_page *) | |
71baba4b | 996 | __get_free_page(__GFP_RECLAIM | __GFP_HIGH); |
081a9d04 BS |
997 | if (!tmp->map) { |
998 | release_swap_reader(handle); | |
999 | return -ENOMEM; | |
1000 | } | |
3aef83e0 | 1001 | |
70fd7614 | 1002 | error = hib_submit_io(REQ_OP_READ, 0, offset, tmp->map, NULL); |
081a9d04 BS |
1003 | if (error) { |
1004 | release_swap_reader(handle); | |
1005 | return error; | |
1006 | } | |
1007 | offset = tmp->map->next_swap; | |
61159a31 RW |
1008 | } |
1009 | handle->k = 0; | |
081a9d04 | 1010 | handle->cur = handle->maps->map; |
61159a31 RW |
1011 | return 0; |
1012 | } | |
1013 | ||
546e0d27 | 1014 | static int swap_read_page(struct swap_map_handle *handle, void *buf, |
343df3c7 | 1015 | struct hib_bio_batch *hb) |
61159a31 | 1016 | { |
3aef83e0 | 1017 | sector_t offset; |
61159a31 | 1018 | int error; |
081a9d04 | 1019 | struct swap_map_page_list *tmp; |
61159a31 RW |
1020 | |
1021 | if (!handle->cur) | |
1022 | return -EINVAL; | |
1023 | offset = handle->cur->entries[handle->k]; | |
1024 | if (!offset) | |
1025 | return -EFAULT; | |
70fd7614 | 1026 | error = hib_submit_io(REQ_OP_READ, 0, offset, buf, hb); |
61159a31 RW |
1027 | if (error) |
1028 | return error; | |
1029 | if (++handle->k >= MAP_PAGE_ENTRIES) { | |
1030 | handle->k = 0; | |
081a9d04 BS |
1031 | free_page((unsigned long)handle->maps->map); |
1032 | tmp = handle->maps; | |
1033 | handle->maps = handle->maps->next; | |
1034 | kfree(tmp); | |
1035 | if (!handle->maps) | |
61159a31 | 1036 | release_swap_reader(handle); |
081a9d04 BS |
1037 | else |
1038 | handle->cur = handle->maps->map; | |
61159a31 RW |
1039 | } |
1040 | return error; | |
1041 | } | |
1042 | ||
6f612af5 JS |
1043 | static int swap_reader_finish(struct swap_map_handle *handle) |
1044 | { | |
1045 | release_swap_reader(handle); | |
1046 | ||
1047 | return 0; | |
1048 | } | |
1049 | ||
61159a31 RW |
1050 | /** |
1051 | * load_image - load the image using the swap map handle | |
1052 | * @handle and the snapshot handle @snapshot | |
1053 | * (assume there are @nr_pages pages to load) | |
1054 | */ | |
1055 | ||
1056 | static int load_image(struct swap_map_handle *handle, | |
1057 | struct snapshot_handle *snapshot, | |
546e0d27 | 1058 | unsigned int nr_to_read) |
61159a31 RW |
1059 | { |
1060 | unsigned int m; | |
081a9d04 | 1061 | int ret = 0; |
db597605 TR |
1062 | ktime_t start; |
1063 | ktime_t stop; | |
343df3c7 | 1064 | struct hib_bio_batch hb; |
546e0d27 AM |
1065 | int err2; |
1066 | unsigned nr_pages; | |
61159a31 | 1067 | |
343df3c7 CH |
1068 | hib_init_batch(&hb); |
1069 | ||
f6cf0545 | 1070 | clean_pages_on_read = true; |
d8150d35 | 1071 | printk(KERN_INFO "PM: Loading image data pages (%u pages)...\n", |
23976728 | 1072 | nr_to_read); |
d8150d35 | 1073 | m = nr_to_read / 10; |
61159a31 RW |
1074 | if (!m) |
1075 | m = 1; | |
1076 | nr_pages = 0; | |
db597605 | 1077 | start = ktime_get(); |
546e0d27 | 1078 | for ( ; ; ) { |
081a9d04 BS |
1079 | ret = snapshot_write_next(snapshot); |
1080 | if (ret <= 0) | |
546e0d27 | 1081 | break; |
343df3c7 | 1082 | ret = swap_read_page(handle, data_of(*snapshot), &hb); |
081a9d04 | 1083 | if (ret) |
546e0d27 AM |
1084 | break; |
1085 | if (snapshot->sync_read) | |
343df3c7 | 1086 | ret = hib_wait_io(&hb); |
081a9d04 | 1087 | if (ret) |
546e0d27 AM |
1088 | break; |
1089 | if (!(nr_pages % m)) | |
d8150d35 BS |
1090 | printk(KERN_INFO "PM: Image loading progress: %3d%%\n", |
1091 | nr_pages / m * 10); | |
546e0d27 AM |
1092 | nr_pages++; |
1093 | } | |
343df3c7 | 1094 | err2 = hib_wait_io(&hb); |
db597605 | 1095 | stop = ktime_get(); |
081a9d04 BS |
1096 | if (!ret) |
1097 | ret = err2; | |
1098 | if (!ret) { | |
d8150d35 | 1099 | printk(KERN_INFO "PM: Image loading done.\n"); |
8357376d | 1100 | snapshot_write_finalize(snapshot); |
e655a250 | 1101 | if (!snapshot_image_loaded(snapshot)) |
081a9d04 | 1102 | ret = -ENODATA; |
d8150d35 | 1103 | } |
db597605 | 1104 | swsusp_show_speed(start, stop, nr_to_read, "Read"); |
081a9d04 BS |
1105 | return ret; |
1106 | } | |
1107 | ||
1108 | /** | |
1109 | * Structure used for LZO data decompression. | |
1110 | */ | |
1111 | struct dec_data { | |
1112 | struct task_struct *thr; /* thread */ | |
1113 | atomic_t ready; /* ready to start flag */ | |
1114 | atomic_t stop; /* ready to stop flag */ | |
1115 | int ret; /* return code */ | |
1116 | wait_queue_head_t go; /* start decompression */ | |
1117 | wait_queue_head_t done; /* decompression done */ | |
1118 | size_t unc_len; /* uncompressed length */ | |
1119 | size_t cmp_len; /* compressed length */ | |
1120 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ | |
1121 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ | |
1122 | }; | |
1123 | ||
1124 | /** | |
1125 | * Deompression function that runs in its own thread. | |
1126 | */ | |
1127 | static int lzo_decompress_threadfn(void *data) | |
1128 | { | |
1129 | struct dec_data *d = data; | |
1130 | ||
1131 | while (1) { | |
1132 | wait_event(d->go, atomic_read(&d->ready) || | |
1133 | kthread_should_stop()); | |
1134 | if (kthread_should_stop()) { | |
1135 | d->thr = NULL; | |
1136 | d->ret = -1; | |
1137 | atomic_set(&d->stop, 1); | |
1138 | wake_up(&d->done); | |
1139 | break; | |
1140 | } | |
1141 | atomic_set(&d->ready, 0); | |
1142 | ||
1143 | d->unc_len = LZO_UNC_SIZE; | |
1144 | d->ret = lzo1x_decompress_safe(d->cmp + LZO_HEADER, d->cmp_len, | |
1145 | d->unc, &d->unc_len); | |
f6cf0545 JM |
1146 | if (clean_pages_on_decompress) |
1147 | flush_icache_range((unsigned long)d->unc, | |
1148 | (unsigned long)d->unc + d->unc_len); | |
1149 | ||
081a9d04 BS |
1150 | atomic_set(&d->stop, 1); |
1151 | wake_up(&d->done); | |
1152 | } | |
1153 | return 0; | |
61159a31 RW |
1154 | } |
1155 | ||
f996fc96 BS |
1156 | /** |
1157 | * load_image_lzo - Load compressed image data and decompress them with LZO. | |
1158 | * @handle: Swap map handle to use for loading data. | |
1159 | * @snapshot: Image to copy uncompressed data into. | |
1160 | * @nr_to_read: Number of pages to load. | |
1161 | */ | |
1162 | static int load_image_lzo(struct swap_map_handle *handle, | |
1163 | struct snapshot_handle *snapshot, | |
1164 | unsigned int nr_to_read) | |
1165 | { | |
1166 | unsigned int m; | |
081a9d04 BS |
1167 | int ret = 0; |
1168 | int eof = 0; | |
343df3c7 | 1169 | struct hib_bio_batch hb; |
db597605 TR |
1170 | ktime_t start; |
1171 | ktime_t stop; | |
f996fc96 | 1172 | unsigned nr_pages; |
081a9d04 BS |
1173 | size_t off; |
1174 | unsigned i, thr, run_threads, nr_threads; | |
1175 | unsigned ring = 0, pg = 0, ring_size = 0, | |
1176 | have = 0, want, need, asked = 0; | |
5a21d489 | 1177 | unsigned long read_pages = 0; |
081a9d04 BS |
1178 | unsigned char **page = NULL; |
1179 | struct dec_data *data = NULL; | |
1180 | struct crc_data *crc = NULL; | |
1181 | ||
343df3c7 CH |
1182 | hib_init_batch(&hb); |
1183 | ||
081a9d04 BS |
1184 | /* |
1185 | * We'll limit the number of threads for decompression to limit memory | |
1186 | * footprint. | |
1187 | */ | |
1188 | nr_threads = num_online_cpus() - 1; | |
1189 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); | |
1190 | ||
5a21d489 | 1191 | page = vmalloc(sizeof(*page) * LZO_MAX_RD_PAGES); |
081a9d04 BS |
1192 | if (!page) { |
1193 | printk(KERN_ERR "PM: Failed to allocate LZO page\n"); | |
1194 | ret = -ENOMEM; | |
1195 | goto out_clean; | |
1196 | } | |
9f339caf | 1197 | |
081a9d04 BS |
1198 | data = vmalloc(sizeof(*data) * nr_threads); |
1199 | if (!data) { | |
1200 | printk(KERN_ERR "PM: Failed to allocate LZO data\n"); | |
1201 | ret = -ENOMEM; | |
1202 | goto out_clean; | |
1203 | } | |
1204 | for (thr = 0; thr < nr_threads; thr++) | |
1205 | memset(&data[thr], 0, offsetof(struct dec_data, go)); | |
9f339caf | 1206 | |
081a9d04 BS |
1207 | crc = kmalloc(sizeof(*crc), GFP_KERNEL); |
1208 | if (!crc) { | |
1209 | printk(KERN_ERR "PM: Failed to allocate crc\n"); | |
1210 | ret = -ENOMEM; | |
1211 | goto out_clean; | |
1212 | } | |
1213 | memset(crc, 0, offsetof(struct crc_data, go)); | |
1214 | ||
f6cf0545 JM |
1215 | clean_pages_on_decompress = true; |
1216 | ||
081a9d04 BS |
1217 | /* |
1218 | * Start the decompression threads. | |
1219 | */ | |
1220 | for (thr = 0; thr < nr_threads; thr++) { | |
1221 | init_waitqueue_head(&data[thr].go); | |
1222 | init_waitqueue_head(&data[thr].done); | |
1223 | ||
1224 | data[thr].thr = kthread_run(lzo_decompress_threadfn, | |
1225 | &data[thr], | |
1226 | "image_decompress/%u", thr); | |
1227 | if (IS_ERR(data[thr].thr)) { | |
1228 | data[thr].thr = NULL; | |
1229 | printk(KERN_ERR | |
1230 | "PM: Cannot start decompression threads\n"); | |
1231 | ret = -ENOMEM; | |
1232 | goto out_clean; | |
9f339caf | 1233 | } |
f996fc96 BS |
1234 | } |
1235 | ||
081a9d04 BS |
1236 | /* |
1237 | * Start the CRC32 thread. | |
1238 | */ | |
1239 | init_waitqueue_head(&crc->go); | |
1240 | init_waitqueue_head(&crc->done); | |
1241 | ||
1242 | handle->crc32 = 0; | |
1243 | crc->crc32 = &handle->crc32; | |
1244 | for (thr = 0; thr < nr_threads; thr++) { | |
1245 | crc->unc[thr] = data[thr].unc; | |
1246 | crc->unc_len[thr] = &data[thr].unc_len; | |
f996fc96 BS |
1247 | } |
1248 | ||
081a9d04 BS |
1249 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); |
1250 | if (IS_ERR(crc->thr)) { | |
1251 | crc->thr = NULL; | |
1252 | printk(KERN_ERR "PM: Cannot start CRC32 thread\n"); | |
1253 | ret = -ENOMEM; | |
1254 | goto out_clean; | |
1255 | } | |
9f339caf | 1256 | |
081a9d04 | 1257 | /* |
5a21d489 BS |
1258 | * Set the number of pages for read buffering. |
1259 | * This is complete guesswork, because we'll only know the real | |
1260 | * picture once prepare_image() is called, which is much later on | |
1261 | * during the image load phase. We'll assume the worst case and | |
1262 | * say that none of the image pages are from high memory. | |
081a9d04 | 1263 | */ |
5a21d489 BS |
1264 | if (low_free_pages() > snapshot_get_image_size()) |
1265 | read_pages = (low_free_pages() - snapshot_get_image_size()) / 2; | |
1266 | read_pages = clamp_val(read_pages, LZO_MIN_RD_PAGES, LZO_MAX_RD_PAGES); | |
9f339caf | 1267 | |
081a9d04 BS |
1268 | for (i = 0; i < read_pages; i++) { |
1269 | page[i] = (void *)__get_free_page(i < LZO_CMP_PAGES ? | |
71baba4b MG |
1270 | __GFP_RECLAIM | __GFP_HIGH : |
1271 | __GFP_RECLAIM | __GFP_NOWARN | | |
1272 | __GFP_NORETRY); | |
5a21d489 | 1273 | |
081a9d04 BS |
1274 | if (!page[i]) { |
1275 | if (i < LZO_CMP_PAGES) { | |
1276 | ring_size = i; | |
1277 | printk(KERN_ERR | |
1278 | "PM: Failed to allocate LZO pages\n"); | |
1279 | ret = -ENOMEM; | |
1280 | goto out_clean; | |
1281 | } else { | |
1282 | break; | |
1283 | } | |
1284 | } | |
f996fc96 | 1285 | } |
081a9d04 | 1286 | want = ring_size = i; |
f996fc96 BS |
1287 | |
1288 | printk(KERN_INFO | |
081a9d04 | 1289 | "PM: Using %u thread(s) for decompression.\n" |
d8150d35 | 1290 | "PM: Loading and decompressing image data (%u pages)...\n", |
081a9d04 | 1291 | nr_threads, nr_to_read); |
d8150d35 | 1292 | m = nr_to_read / 10; |
f996fc96 BS |
1293 | if (!m) |
1294 | m = 1; | |
1295 | nr_pages = 0; | |
db597605 | 1296 | start = ktime_get(); |
f996fc96 | 1297 | |
081a9d04 BS |
1298 | ret = snapshot_write_next(snapshot); |
1299 | if (ret <= 0) | |
f996fc96 BS |
1300 | goto out_finish; |
1301 | ||
081a9d04 BS |
1302 | for(;;) { |
1303 | for (i = 0; !eof && i < want; i++) { | |
343df3c7 | 1304 | ret = swap_read_page(handle, page[ring], &hb); |
081a9d04 BS |
1305 | if (ret) { |
1306 | /* | |
1307 | * On real read error, finish. On end of data, | |
1308 | * set EOF flag and just exit the read loop. | |
1309 | */ | |
1310 | if (handle->cur && | |
1311 | handle->cur->entries[handle->k]) { | |
1312 | goto out_finish; | |
1313 | } else { | |
1314 | eof = 1; | |
1315 | break; | |
1316 | } | |
1317 | } | |
1318 | if (++ring >= ring_size) | |
1319 | ring = 0; | |
f996fc96 | 1320 | } |
081a9d04 BS |
1321 | asked += i; |
1322 | want -= i; | |
f996fc96 | 1323 | |
081a9d04 BS |
1324 | /* |
1325 | * We are out of data, wait for some more. | |
1326 | */ | |
1327 | if (!have) { | |
1328 | if (!asked) | |
1329 | break; | |
1330 | ||
343df3c7 | 1331 | ret = hib_wait_io(&hb); |
081a9d04 | 1332 | if (ret) |
f996fc96 | 1333 | goto out_finish; |
081a9d04 BS |
1334 | have += asked; |
1335 | asked = 0; | |
1336 | if (eof) | |
1337 | eof = 2; | |
9f339caf | 1338 | } |
f996fc96 | 1339 | |
081a9d04 BS |
1340 | if (crc->run_threads) { |
1341 | wait_event(crc->done, atomic_read(&crc->stop)); | |
1342 | atomic_set(&crc->stop, 0); | |
1343 | crc->run_threads = 0; | |
f996fc96 BS |
1344 | } |
1345 | ||
081a9d04 BS |
1346 | for (thr = 0; have && thr < nr_threads; thr++) { |
1347 | data[thr].cmp_len = *(size_t *)page[pg]; | |
1348 | if (unlikely(!data[thr].cmp_len || | |
1349 | data[thr].cmp_len > | |
1350 | lzo1x_worst_compress(LZO_UNC_SIZE))) { | |
1351 | printk(KERN_ERR | |
1352 | "PM: Invalid LZO compressed length\n"); | |
1353 | ret = -1; | |
1354 | goto out_finish; | |
1355 | } | |
1356 | ||
1357 | need = DIV_ROUND_UP(data[thr].cmp_len + LZO_HEADER, | |
1358 | PAGE_SIZE); | |
1359 | if (need > have) { | |
1360 | if (eof > 1) { | |
1361 | ret = -1; | |
1362 | goto out_finish; | |
1363 | } | |
1364 | break; | |
1365 | } | |
1366 | ||
1367 | for (off = 0; | |
1368 | off < LZO_HEADER + data[thr].cmp_len; | |
1369 | off += PAGE_SIZE) { | |
1370 | memcpy(data[thr].cmp + off, | |
1371 | page[pg], PAGE_SIZE); | |
1372 | have--; | |
1373 | want++; | |
1374 | if (++pg >= ring_size) | |
1375 | pg = 0; | |
1376 | } | |
1377 | ||
1378 | atomic_set(&data[thr].ready, 1); | |
1379 | wake_up(&data[thr].go); | |
f996fc96 BS |
1380 | } |
1381 | ||
081a9d04 BS |
1382 | /* |
1383 | * Wait for more data while we are decompressing. | |
1384 | */ | |
1385 | if (have < LZO_CMP_PAGES && asked) { | |
343df3c7 | 1386 | ret = hib_wait_io(&hb); |
081a9d04 BS |
1387 | if (ret) |
1388 | goto out_finish; | |
1389 | have += asked; | |
1390 | asked = 0; | |
1391 | if (eof) | |
1392 | eof = 2; | |
f996fc96 BS |
1393 | } |
1394 | ||
081a9d04 BS |
1395 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
1396 | wait_event(data[thr].done, | |
1397 | atomic_read(&data[thr].stop)); | |
1398 | atomic_set(&data[thr].stop, 0); | |
1399 | ||
1400 | ret = data[thr].ret; | |
f996fc96 | 1401 | |
081a9d04 BS |
1402 | if (ret < 0) { |
1403 | printk(KERN_ERR | |
1404 | "PM: LZO decompression failed\n"); | |
1405 | goto out_finish; | |
1406 | } | |
f996fc96 | 1407 | |
081a9d04 BS |
1408 | if (unlikely(!data[thr].unc_len || |
1409 | data[thr].unc_len > LZO_UNC_SIZE || | |
1410 | data[thr].unc_len & (PAGE_SIZE - 1))) { | |
1411 | printk(KERN_ERR | |
1412 | "PM: Invalid LZO uncompressed length\n"); | |
1413 | ret = -1; | |
f996fc96 | 1414 | goto out_finish; |
081a9d04 BS |
1415 | } |
1416 | ||
1417 | for (off = 0; | |
1418 | off < data[thr].unc_len; off += PAGE_SIZE) { | |
1419 | memcpy(data_of(*snapshot), | |
1420 | data[thr].unc + off, PAGE_SIZE); | |
1421 | ||
1422 | if (!(nr_pages % m)) | |
d8150d35 BS |
1423 | printk(KERN_INFO |
1424 | "PM: Image loading progress: " | |
1425 | "%3d%%\n", | |
1426 | nr_pages / m * 10); | |
081a9d04 BS |
1427 | nr_pages++; |
1428 | ||
1429 | ret = snapshot_write_next(snapshot); | |
1430 | if (ret <= 0) { | |
1431 | crc->run_threads = thr + 1; | |
1432 | atomic_set(&crc->ready, 1); | |
1433 | wake_up(&crc->go); | |
1434 | goto out_finish; | |
1435 | } | |
1436 | } | |
f996fc96 | 1437 | } |
081a9d04 BS |
1438 | |
1439 | crc->run_threads = thr; | |
1440 | atomic_set(&crc->ready, 1); | |
1441 | wake_up(&crc->go); | |
f996fc96 BS |
1442 | } |
1443 | ||
1444 | out_finish: | |
081a9d04 BS |
1445 | if (crc->run_threads) { |
1446 | wait_event(crc->done, atomic_read(&crc->stop)); | |
1447 | atomic_set(&crc->stop, 0); | |
1448 | } | |
db597605 | 1449 | stop = ktime_get(); |
081a9d04 | 1450 | if (!ret) { |
d8150d35 | 1451 | printk(KERN_INFO "PM: Image loading done.\n"); |
f996fc96 BS |
1452 | snapshot_write_finalize(snapshot); |
1453 | if (!snapshot_image_loaded(snapshot)) | |
081a9d04 BS |
1454 | ret = -ENODATA; |
1455 | if (!ret) { | |
1456 | if (swsusp_header->flags & SF_CRC32_MODE) { | |
1457 | if(handle->crc32 != swsusp_header->crc32) { | |
1458 | printk(KERN_ERR | |
1459 | "PM: Invalid image CRC32!\n"); | |
1460 | ret = -ENODATA; | |
1461 | } | |
1462 | } | |
1463 | } | |
d8150d35 | 1464 | } |
db597605 | 1465 | swsusp_show_speed(start, stop, nr_to_read, "Read"); |
081a9d04 BS |
1466 | out_clean: |
1467 | for (i = 0; i < ring_size; i++) | |
9f339caf | 1468 | free_page((unsigned long)page[i]); |
081a9d04 BS |
1469 | if (crc) { |
1470 | if (crc->thr) | |
1471 | kthread_stop(crc->thr); | |
1472 | kfree(crc); | |
1473 | } | |
1474 | if (data) { | |
1475 | for (thr = 0; thr < nr_threads; thr++) | |
1476 | if (data[thr].thr) | |
1477 | kthread_stop(data[thr].thr); | |
1478 | vfree(data); | |
1479 | } | |
6c45de0d | 1480 | vfree(page); |
f996fc96 | 1481 | |
081a9d04 | 1482 | return ret; |
f996fc96 BS |
1483 | } |
1484 | ||
a634cc10 RW |
1485 | /** |
1486 | * swsusp_read - read the hibernation image. | |
1487 | * @flags_p: flags passed by the "frozen" kernel in the image header should | |
b595076a | 1488 | * be written into this memory location |
a634cc10 RW |
1489 | */ |
1490 | ||
1491 | int swsusp_read(unsigned int *flags_p) | |
61159a31 RW |
1492 | { |
1493 | int error; | |
1494 | struct swap_map_handle handle; | |
1495 | struct snapshot_handle snapshot; | |
1496 | struct swsusp_info *header; | |
1497 | ||
61159a31 | 1498 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 1499 | error = snapshot_write_next(&snapshot); |
61159a31 RW |
1500 | if (error < PAGE_SIZE) |
1501 | return error < 0 ? error : -EFAULT; | |
1502 | header = (struct swsusp_info *)data_of(snapshot); | |
6f612af5 JS |
1503 | error = get_swap_reader(&handle, flags_p); |
1504 | if (error) | |
1505 | goto end; | |
61159a31 | 1506 | if (!error) |
546e0d27 | 1507 | error = swap_read_page(&handle, header, NULL); |
f996fc96 BS |
1508 | if (!error) { |
1509 | error = (*flags_p & SF_NOCOMPRESS_MODE) ? | |
1510 | load_image(&handle, &snapshot, header->pages - 1) : | |
1511 | load_image_lzo(&handle, &snapshot, header->pages - 1); | |
1512 | } | |
6f612af5 JS |
1513 | swap_reader_finish(&handle); |
1514 | end: | |
61159a31 | 1515 | if (!error) |
23976728 | 1516 | pr_debug("PM: Image successfully loaded\n"); |
61159a31 | 1517 | else |
23976728 | 1518 | pr_debug("PM: Error %d resuming\n", error); |
61159a31 RW |
1519 | return error; |
1520 | } | |
1521 | ||
1522 | /** | |
1523 | * swsusp_check - Check for swsusp signature in the resume device | |
1524 | */ | |
1525 | ||
1526 | int swsusp_check(void) | |
1527 | { | |
1528 | int error; | |
1529 | ||
d4d77629 TH |
1530 | hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device, |
1531 | FMODE_READ, NULL); | |
8a0d613f JS |
1532 | if (!IS_ERR(hib_resume_bdev)) { |
1533 | set_blocksize(hib_resume_bdev, PAGE_SIZE); | |
3ecb01df | 1534 | clear_page(swsusp_header); |
70fd7614 | 1535 | error = hib_submit_io(REQ_OP_READ, 0, |
162b99e3 | 1536 | swsusp_resume_block, |
1b29c164 | 1537 | swsusp_header, NULL); |
9a154d9d | 1538 | if (error) |
76b57e61 | 1539 | goto put; |
9a154d9d | 1540 | |
3624eb04 | 1541 | if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) { |
1b29c164 | 1542 | memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10); |
61159a31 | 1543 | /* Reset swap signature now */ |
70fd7614 | 1544 | error = hib_submit_io(REQ_OP_WRITE, REQ_SYNC, |
162b99e3 | 1545 | swsusp_resume_block, |
1b29c164 | 1546 | swsusp_header, NULL); |
61159a31 | 1547 | } else { |
76b57e61 | 1548 | error = -EINVAL; |
61159a31 | 1549 | } |
76b57e61 JS |
1550 | |
1551 | put: | |
61159a31 | 1552 | if (error) |
8a0d613f | 1553 | blkdev_put(hib_resume_bdev, FMODE_READ); |
61159a31 | 1554 | else |
d0941ead | 1555 | pr_debug("PM: Image signature found, resuming\n"); |
61159a31 | 1556 | } else { |
8a0d613f | 1557 | error = PTR_ERR(hib_resume_bdev); |
61159a31 RW |
1558 | } |
1559 | ||
1560 | if (error) | |
d0941ead | 1561 | pr_debug("PM: Image not found (code %d)\n", error); |
61159a31 RW |
1562 | |
1563 | return error; | |
1564 | } | |
1565 | ||
1566 | /** | |
1567 | * swsusp_close - close swap device. | |
1568 | */ | |
1569 | ||
c2dd0dae | 1570 | void swsusp_close(fmode_t mode) |
61159a31 | 1571 | { |
8a0d613f | 1572 | if (IS_ERR(hib_resume_bdev)) { |
23976728 | 1573 | pr_debug("PM: Image device not initialised\n"); |
61159a31 RW |
1574 | return; |
1575 | } | |
1576 | ||
8a0d613f | 1577 | blkdev_put(hib_resume_bdev, mode); |
61159a31 | 1578 | } |
1b29c164 | 1579 | |
62c552cc BS |
1580 | /** |
1581 | * swsusp_unmark - Unmark swsusp signature in the resume device | |
1582 | */ | |
1583 | ||
1584 | #ifdef CONFIG_SUSPEND | |
1585 | int swsusp_unmark(void) | |
1586 | { | |
1587 | int error; | |
1588 | ||
70fd7614 | 1589 | hib_submit_io(REQ_OP_READ, 0, swsusp_resume_block, |
162b99e3 | 1590 | swsusp_header, NULL); |
62c552cc BS |
1591 | if (!memcmp(HIBERNATE_SIG,swsusp_header->sig, 10)) { |
1592 | memcpy(swsusp_header->sig,swsusp_header->orig_sig, 10); | |
70fd7614 | 1593 | error = hib_submit_io(REQ_OP_WRITE, REQ_SYNC, |
162b99e3 | 1594 | swsusp_resume_block, |
62c552cc BS |
1595 | swsusp_header, NULL); |
1596 | } else { | |
1597 | printk(KERN_ERR "PM: Cannot find swsusp signature!\n"); | |
1598 | error = -ENODEV; | |
1599 | } | |
1600 | ||
1601 | /* | |
1602 | * We just returned from suspend, we don't need the image any more. | |
1603 | */ | |
1604 | free_all_swap_pages(root_swap); | |
1605 | ||
1606 | return error; | |
1607 | } | |
1608 | #endif | |
1609 | ||
1b29c164 VG |
1610 | static int swsusp_header_init(void) |
1611 | { | |
1612 | swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL); | |
1613 | if (!swsusp_header) | |
1614 | panic("Could not allocate memory for swsusp_header\n"); | |
1615 | return 0; | |
1616 | } | |
1617 | ||
1618 | core_initcall(swsusp_header_init); |