Commit | Line | Data |
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55716d26 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
61159a31 RW |
2 | /* |
3 | * linux/kernel/power/swap.c | |
4 | * | |
5 | * This file provides functions for reading the suspend image from | |
6 | * and writing it to a swap partition. | |
7 | * | |
a2531293 | 8 | * Copyright (C) 1998,2001-2005 Pavel Machek <pavel@ucw.cz> |
61159a31 | 9 | * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl> |
5a21d489 | 10 | * Copyright (C) 2010-2012 Bojan Smojver <bojan@rexursive.com> |
61159a31 RW |
11 | */ |
12 | ||
64ec72a1 JP |
13 | #define pr_fmt(fmt) "PM: " fmt |
14 | ||
61159a31 | 15 | #include <linux/module.h> |
61159a31 | 16 | #include <linux/file.h> |
61159a31 RW |
17 | #include <linux/delay.h> |
18 | #include <linux/bitops.h> | |
61159a31 | 19 | #include <linux/device.h> |
61159a31 | 20 | #include <linux/bio.h> |
546e0d27 | 21 | #include <linux/blkdev.h> |
61159a31 RW |
22 | #include <linux/swap.h> |
23 | #include <linux/swapops.h> | |
24 | #include <linux/pm.h> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
f996fc96 BS |
26 | #include <linux/lzo.h> |
27 | #include <linux/vmalloc.h> | |
081a9d04 BS |
28 | #include <linux/cpumask.h> |
29 | #include <linux/atomic.h> | |
30 | #include <linux/kthread.h> | |
31 | #include <linux/crc32.h> | |
db597605 | 32 | #include <linux/ktime.h> |
61159a31 RW |
33 | |
34 | #include "power.h" | |
35 | ||
be8cd644 | 36 | #define HIBERNATE_SIG "S1SUSPEND" |
61159a31 | 37 | |
74d95555 DW |
38 | u32 swsusp_hardware_signature; |
39 | ||
f6cf0545 JM |
40 | /* |
41 | * When reading an {un,}compressed image, we may restore pages in place, | |
42 | * in which case some architectures need these pages cleaning before they | |
43 | * can be executed. We don't know which pages these may be, so clean the lot. | |
44 | */ | |
45 | static bool clean_pages_on_read; | |
46 | static bool clean_pages_on_decompress; | |
47 | ||
51fb352b JS |
48 | /* |
49 | * The swap map is a data structure used for keeping track of each page | |
50 | * written to a swap partition. It consists of many swap_map_page | |
90133673 | 51 | * structures that contain each an array of MAP_PAGE_ENTRIES swap entries. |
51fb352b JS |
52 | * These structures are stored on the swap and linked together with the |
53 | * help of the .next_swap member. | |
54 | * | |
55 | * The swap map is created during suspend. The swap map pages are | |
56 | * allocated and populated one at a time, so we only need one memory | |
57 | * page to set up the entire structure. | |
58 | * | |
081a9d04 | 59 | * During resume we pick up all swap_map_page structures into a list. |
51fb352b JS |
60 | */ |
61 | ||
62 | #define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1) | |
63 | ||
f8262d47 BS |
64 | /* |
65 | * Number of free pages that are not high. | |
66 | */ | |
67 | static inline unsigned long low_free_pages(void) | |
68 | { | |
69 | return nr_free_pages() - nr_free_highpages(); | |
70 | } | |
71 | ||
72 | /* | |
73 | * Number of pages required to be kept free while writing the image. Always | |
74 | * half of all available low pages before the writing starts. | |
75 | */ | |
76 | static inline unsigned long reqd_free_pages(void) | |
77 | { | |
78 | return low_free_pages() / 2; | |
79 | } | |
80 | ||
51fb352b JS |
81 | struct swap_map_page { |
82 | sector_t entries[MAP_PAGE_ENTRIES]; | |
83 | sector_t next_swap; | |
84 | }; | |
85 | ||
081a9d04 BS |
86 | struct swap_map_page_list { |
87 | struct swap_map_page *map; | |
88 | struct swap_map_page_list *next; | |
89 | }; | |
90 | ||
444e1154 | 91 | /* |
51fb352b JS |
92 | * The swap_map_handle structure is used for handling swap in |
93 | * a file-alike way | |
94 | */ | |
95 | ||
96 | struct swap_map_handle { | |
97 | struct swap_map_page *cur; | |
081a9d04 | 98 | struct swap_map_page_list *maps; |
51fb352b JS |
99 | sector_t cur_swap; |
100 | sector_t first_sector; | |
101 | unsigned int k; | |
f8262d47 | 102 | unsigned long reqd_free_pages; |
081a9d04 | 103 | u32 crc32; |
51fb352b JS |
104 | }; |
105 | ||
1b29c164 | 106 | struct swsusp_header { |
081a9d04 | 107 | char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int) - |
74d95555 DW |
108 | sizeof(u32) - sizeof(u32)]; |
109 | u32 hw_sig; | |
081a9d04 | 110 | u32 crc32; |
3aef83e0 | 111 | sector_t image; |
a634cc10 | 112 | unsigned int flags; /* Flags to pass to the "boot" kernel */ |
61159a31 RW |
113 | char orig_sig[10]; |
114 | char sig[10]; | |
52f5684c | 115 | } __packed; |
1b29c164 VG |
116 | |
117 | static struct swsusp_header *swsusp_header; | |
61159a31 | 118 | |
444e1154 | 119 | /* |
0414f2ec NC |
120 | * The following functions are used for tracing the allocated |
121 | * swap pages, so that they can be freed in case of an error. | |
122 | */ | |
123 | ||
124 | struct swsusp_extent { | |
125 | struct rb_node node; | |
126 | unsigned long start; | |
127 | unsigned long end; | |
128 | }; | |
129 | ||
130 | static struct rb_root swsusp_extents = RB_ROOT; | |
131 | ||
132 | static int swsusp_extents_insert(unsigned long swap_offset) | |
133 | { | |
134 | struct rb_node **new = &(swsusp_extents.rb_node); | |
135 | struct rb_node *parent = NULL; | |
136 | struct swsusp_extent *ext; | |
137 | ||
138 | /* Figure out where to put the new node */ | |
139 | while (*new) { | |
8316bd72 | 140 | ext = rb_entry(*new, struct swsusp_extent, node); |
0414f2ec NC |
141 | parent = *new; |
142 | if (swap_offset < ext->start) { | |
143 | /* Try to merge */ | |
144 | if (swap_offset == ext->start - 1) { | |
145 | ext->start--; | |
146 | return 0; | |
147 | } | |
148 | new = &((*new)->rb_left); | |
149 | } else if (swap_offset > ext->end) { | |
150 | /* Try to merge */ | |
151 | if (swap_offset == ext->end + 1) { | |
152 | ext->end++; | |
153 | return 0; | |
154 | } | |
155 | new = &((*new)->rb_right); | |
156 | } else { | |
157 | /* It already is in the tree */ | |
158 | return -EINVAL; | |
159 | } | |
160 | } | |
161 | /* Add the new node and rebalance the tree. */ | |
162 | ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL); | |
163 | if (!ext) | |
164 | return -ENOMEM; | |
165 | ||
166 | ext->start = swap_offset; | |
167 | ext->end = swap_offset; | |
168 | rb_link_node(&ext->node, parent, new); | |
169 | rb_insert_color(&ext->node, &swsusp_extents); | |
170 | return 0; | |
171 | } | |
172 | ||
444e1154 | 173 | /* |
0414f2ec NC |
174 | * alloc_swapdev_block - allocate a swap page and register that it has |
175 | * been allocated, so that it can be freed in case of an error. | |
176 | */ | |
177 | ||
178 | sector_t alloc_swapdev_block(int swap) | |
179 | { | |
180 | unsigned long offset; | |
181 | ||
910321ea | 182 | offset = swp_offset(get_swap_page_of_type(swap)); |
0414f2ec NC |
183 | if (offset) { |
184 | if (swsusp_extents_insert(offset)) | |
910321ea | 185 | swap_free(swp_entry(swap, offset)); |
0414f2ec NC |
186 | else |
187 | return swapdev_block(swap, offset); | |
188 | } | |
189 | return 0; | |
190 | } | |
191 | ||
444e1154 | 192 | /* |
0414f2ec | 193 | * free_all_swap_pages - free swap pages allocated for saving image data. |
90133673 | 194 | * It also frees the extents used to register which swap entries had been |
0414f2ec NC |
195 | * allocated. |
196 | */ | |
197 | ||
198 | void free_all_swap_pages(int swap) | |
199 | { | |
200 | struct rb_node *node; | |
201 | ||
202 | while ((node = swsusp_extents.rb_node)) { | |
203 | struct swsusp_extent *ext; | |
204 | unsigned long offset; | |
205 | ||
47087eeb | 206 | ext = rb_entry(node, struct swsusp_extent, node); |
0414f2ec NC |
207 | rb_erase(node, &swsusp_extents); |
208 | for (offset = ext->start; offset <= ext->end; offset++) | |
910321ea | 209 | swap_free(swp_entry(swap, offset)); |
0414f2ec NC |
210 | |
211 | kfree(ext); | |
212 | } | |
213 | } | |
214 | ||
215 | int swsusp_swap_in_use(void) | |
216 | { | |
217 | return (swsusp_extents.rb_node != NULL); | |
218 | } | |
219 | ||
61159a31 | 220 | /* |
3fc6b34f | 221 | * General things |
61159a31 RW |
222 | */ |
223 | ||
224 | static unsigned short root_swap = 0xffff; | |
343df3c7 CH |
225 | static struct block_device *hib_resume_bdev; |
226 | ||
227 | struct hib_bio_batch { | |
228 | atomic_t count; | |
229 | wait_queue_head_t wait; | |
4e4cbee9 | 230 | blk_status_t error; |
55c4478a | 231 | struct blk_plug plug; |
343df3c7 CH |
232 | }; |
233 | ||
234 | static void hib_init_batch(struct hib_bio_batch *hb) | |
235 | { | |
236 | atomic_set(&hb->count, 0); | |
237 | init_waitqueue_head(&hb->wait); | |
4e4cbee9 | 238 | hb->error = BLK_STS_OK; |
55c4478a XC |
239 | blk_start_plug(&hb->plug); |
240 | } | |
241 | ||
242 | static void hib_finish_batch(struct hib_bio_batch *hb) | |
243 | { | |
244 | blk_finish_plug(&hb->plug); | |
343df3c7 CH |
245 | } |
246 | ||
4246a0b6 | 247 | static void hib_end_io(struct bio *bio) |
343df3c7 CH |
248 | { |
249 | struct hib_bio_batch *hb = bio->bi_private; | |
263663cd | 250 | struct page *page = bio_first_page_all(bio); |
343df3c7 | 251 | |
4e4cbee9 | 252 | if (bio->bi_status) { |
64ec72a1 JP |
253 | pr_alert("Read-error on swap-device (%u:%u:%Lu)\n", |
254 | MAJOR(bio_dev(bio)), MINOR(bio_dev(bio)), | |
255 | (unsigned long long)bio->bi_iter.bi_sector); | |
343df3c7 CH |
256 | } |
257 | ||
258 | if (bio_data_dir(bio) == WRITE) | |
259 | put_page(page); | |
f6cf0545 JM |
260 | else if (clean_pages_on_read) |
261 | flush_icache_range((unsigned long)page_address(page), | |
262 | (unsigned long)page_address(page) + PAGE_SIZE); | |
343df3c7 | 263 | |
4e4cbee9 CH |
264 | if (bio->bi_status && !hb->error) |
265 | hb->error = bio->bi_status; | |
343df3c7 CH |
266 | if (atomic_dec_and_test(&hb->count)) |
267 | wake_up(&hb->wait); | |
268 | ||
269 | bio_put(bio); | |
270 | } | |
271 | ||
568e34ed BVA |
272 | static int hib_submit_io(blk_opf_t opf, pgoff_t page_off, void *addr, |
273 | struct hib_bio_batch *hb) | |
343df3c7 CH |
274 | { |
275 | struct page *page = virt_to_page(addr); | |
276 | struct bio *bio; | |
277 | int error = 0; | |
278 | ||
568e34ed | 279 | bio = bio_alloc(hib_resume_bdev, 1, opf, GFP_NOIO | __GFP_HIGH); |
343df3c7 | 280 | bio->bi_iter.bi_sector = page_off * (PAGE_SIZE >> 9); |
343df3c7 CH |
281 | |
282 | if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { | |
64ec72a1 JP |
283 | pr_err("Adding page to bio failed at %llu\n", |
284 | (unsigned long long)bio->bi_iter.bi_sector); | |
343df3c7 CH |
285 | bio_put(bio); |
286 | return -EFAULT; | |
287 | } | |
288 | ||
289 | if (hb) { | |
290 | bio->bi_end_io = hib_end_io; | |
291 | bio->bi_private = hb; | |
292 | atomic_inc(&hb->count); | |
4e49ea4a | 293 | submit_bio(bio); |
343df3c7 | 294 | } else { |
4e49ea4a | 295 | error = submit_bio_wait(bio); |
343df3c7 CH |
296 | bio_put(bio); |
297 | } | |
298 | ||
299 | return error; | |
300 | } | |
301 | ||
01de5fcd | 302 | static int hib_wait_io(struct hib_bio_batch *hb) |
343df3c7 | 303 | { |
55c4478a XC |
304 | /* |
305 | * We are relying on the behavior of blk_plug that a thread with | |
306 | * a plug will flush the plug list before sleeping. | |
307 | */ | |
343df3c7 | 308 | wait_event(hb->wait, atomic_read(&hb->count) == 0); |
01de5fcd | 309 | return blk_status_to_errno(hb->error); |
343df3c7 | 310 | } |
3fc6b34f | 311 | |
3fc6b34f RW |
312 | /* |
313 | * Saving part | |
314 | */ | |
51fb352b | 315 | static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags) |
61159a31 RW |
316 | { |
317 | int error; | |
318 | ||
568e34ed | 319 | hib_submit_io(REQ_OP_READ, swsusp_resume_block, swsusp_header, NULL); |
1b29c164 VG |
320 | if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) || |
321 | !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) { | |
322 | memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10); | |
3624eb04 | 323 | memcpy(swsusp_header->sig, HIBERNATE_SIG, 10); |
51fb352b | 324 | swsusp_header->image = handle->first_sector; |
74d95555 DW |
325 | if (swsusp_hardware_signature) { |
326 | swsusp_header->hw_sig = swsusp_hardware_signature; | |
327 | flags |= SF_HW_SIG; | |
328 | } | |
a634cc10 | 329 | swsusp_header->flags = flags; |
081a9d04 BS |
330 | if (flags & SF_CRC32_MODE) |
331 | swsusp_header->crc32 = handle->crc32; | |
568e34ed | 332 | error = hib_submit_io(REQ_OP_WRITE | REQ_SYNC, |
162b99e3 | 333 | swsusp_resume_block, swsusp_header, NULL); |
61159a31 | 334 | } else { |
64ec72a1 | 335 | pr_err("Swap header not found!\n"); |
61159a31 RW |
336 | error = -ENODEV; |
337 | } | |
338 | return error; | |
339 | } | |
340 | ||
341 | /** | |
342 | * swsusp_swap_check - check if the resume device is a swap device | |
343 | * and get its index (if so) | |
6f612af5 JS |
344 | * |
345 | * This is called before saving image | |
61159a31 | 346 | */ |
6f612af5 | 347 | static int swsusp_swap_check(void) |
61159a31 | 348 | { |
3aef83e0 RW |
349 | int res; |
350 | ||
21bd9005 CH |
351 | if (swsusp_resume_device) |
352 | res = swap_type_of(swsusp_resume_device, swsusp_resume_block); | |
353 | else | |
354 | res = find_first_swap(&swsusp_resume_device); | |
3aef83e0 RW |
355 | if (res < 0) |
356 | return res; | |
3aef83e0 | 357 | root_swap = res; |
21bd9005 | 358 | |
36daaa98 CH |
359 | hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device, FMODE_WRITE, |
360 | NULL); | |
361 | if (IS_ERR(hib_resume_bdev)) | |
362 | return PTR_ERR(hib_resume_bdev); | |
3aef83e0 | 363 | |
8a0d613f | 364 | res = set_blocksize(hib_resume_bdev, PAGE_SIZE); |
3aef83e0 | 365 | if (res < 0) |
8a0d613f | 366 | blkdev_put(hib_resume_bdev, FMODE_WRITE); |
61159a31 | 367 | |
61159a31 RW |
368 | return res; |
369 | } | |
370 | ||
371 | /** | |
372 | * write_page - Write one page to given swap location. | |
373 | * @buf: Address we're writing. | |
374 | * @offset: Offset of the swap page we're writing to. | |
343df3c7 | 375 | * @hb: bio completion batch |
61159a31 RW |
376 | */ |
377 | ||
343df3c7 | 378 | static int write_page(void *buf, sector_t offset, struct hib_bio_batch *hb) |
61159a31 | 379 | { |
3aef83e0 | 380 | void *src; |
081a9d04 | 381 | int ret; |
3aef83e0 RW |
382 | |
383 | if (!offset) | |
384 | return -ENOSPC; | |
385 | ||
343df3c7 | 386 | if (hb) { |
0eb0b63c | 387 | src = (void *)__get_free_page(GFP_NOIO | __GFP_NOWARN | |
5a21d489 | 388 | __GFP_NORETRY); |
3aef83e0 | 389 | if (src) { |
3ecb01df | 390 | copy_page(src, buf); |
3aef83e0 | 391 | } else { |
343df3c7 | 392 | ret = hib_wait_io(hb); /* Free pages */ |
081a9d04 BS |
393 | if (ret) |
394 | return ret; | |
0eb0b63c | 395 | src = (void *)__get_free_page(GFP_NOIO | |
5a21d489 BS |
396 | __GFP_NOWARN | |
397 | __GFP_NORETRY); | |
081a9d04 BS |
398 | if (src) { |
399 | copy_page(src, buf); | |
400 | } else { | |
401 | WARN_ON_ONCE(1); | |
343df3c7 | 402 | hb = NULL; /* Go synchronous */ |
081a9d04 BS |
403 | src = buf; |
404 | } | |
ab954160 | 405 | } |
3aef83e0 RW |
406 | } else { |
407 | src = buf; | |
61159a31 | 408 | } |
568e34ed | 409 | return hib_submit_io(REQ_OP_WRITE | REQ_SYNC, offset, src, hb); |
61159a31 RW |
410 | } |
411 | ||
61159a31 RW |
412 | static void release_swap_writer(struct swap_map_handle *handle) |
413 | { | |
414 | if (handle->cur) | |
415 | free_page((unsigned long)handle->cur); | |
416 | handle->cur = NULL; | |
61159a31 RW |
417 | } |
418 | ||
419 | static int get_swap_writer(struct swap_map_handle *handle) | |
420 | { | |
6f612af5 JS |
421 | int ret; |
422 | ||
423 | ret = swsusp_swap_check(); | |
424 | if (ret) { | |
425 | if (ret != -ENOSPC) | |
64ec72a1 | 426 | pr_err("Cannot find swap device, try swapon -a\n"); |
6f612af5 JS |
427 | return ret; |
428 | } | |
61159a31 | 429 | handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL); |
6f612af5 JS |
430 | if (!handle->cur) { |
431 | ret = -ENOMEM; | |
432 | goto err_close; | |
433 | } | |
d1d241cc | 434 | handle->cur_swap = alloc_swapdev_block(root_swap); |
61159a31 | 435 | if (!handle->cur_swap) { |
6f612af5 JS |
436 | ret = -ENOSPC; |
437 | goto err_rel; | |
61159a31 RW |
438 | } |
439 | handle->k = 0; | |
f8262d47 | 440 | handle->reqd_free_pages = reqd_free_pages(); |
51fb352b | 441 | handle->first_sector = handle->cur_swap; |
61159a31 | 442 | return 0; |
6f612af5 JS |
443 | err_rel: |
444 | release_swap_writer(handle); | |
445 | err_close: | |
446 | swsusp_close(FMODE_WRITE); | |
447 | return ret; | |
61159a31 RW |
448 | } |
449 | ||
ab954160 | 450 | static int swap_write_page(struct swap_map_handle *handle, void *buf, |
343df3c7 | 451 | struct hib_bio_batch *hb) |
ab954160 AM |
452 | { |
453 | int error = 0; | |
3aef83e0 | 454 | sector_t offset; |
61159a31 RW |
455 | |
456 | if (!handle->cur) | |
457 | return -EINVAL; | |
d1d241cc | 458 | offset = alloc_swapdev_block(root_swap); |
343df3c7 | 459 | error = write_page(buf, offset, hb); |
61159a31 RW |
460 | if (error) |
461 | return error; | |
462 | handle->cur->entries[handle->k++] = offset; | |
463 | if (handle->k >= MAP_PAGE_ENTRIES) { | |
d1d241cc | 464 | offset = alloc_swapdev_block(root_swap); |
61159a31 RW |
465 | if (!offset) |
466 | return -ENOSPC; | |
467 | handle->cur->next_swap = offset; | |
343df3c7 | 468 | error = write_page(handle->cur, handle->cur_swap, hb); |
61159a31 | 469 | if (error) |
ab954160 | 470 | goto out; |
3ecb01df | 471 | clear_page(handle->cur); |
61159a31 RW |
472 | handle->cur_swap = offset; |
473 | handle->k = 0; | |
5a21d489 | 474 | |
343df3c7 CH |
475 | if (hb && low_free_pages() <= handle->reqd_free_pages) { |
476 | error = hib_wait_io(hb); | |
5a21d489 BS |
477 | if (error) |
478 | goto out; | |
479 | /* | |
480 | * Recalculate the number of required free pages, to | |
481 | * make sure we never take more than half. | |
482 | */ | |
483 | handle->reqd_free_pages = reqd_free_pages(); | |
484 | } | |
081a9d04 | 485 | } |
59a49335 | 486 | out: |
ab954160 | 487 | return error; |
61159a31 RW |
488 | } |
489 | ||
490 | static int flush_swap_writer(struct swap_map_handle *handle) | |
491 | { | |
492 | if (handle->cur && handle->cur_swap) | |
ab954160 | 493 | return write_page(handle->cur, handle->cur_swap, NULL); |
61159a31 RW |
494 | else |
495 | return -EINVAL; | |
496 | } | |
497 | ||
6f612af5 JS |
498 | static int swap_writer_finish(struct swap_map_handle *handle, |
499 | unsigned int flags, int error) | |
500 | { | |
501 | if (!error) { | |
64ec72a1 | 502 | pr_info("S"); |
6f612af5 | 503 | error = mark_swapfiles(handle, flags); |
64ec72a1 | 504 | pr_cont("|\n"); |
fef9c8d2 | 505 | flush_swap_writer(handle); |
6f612af5 JS |
506 | } |
507 | ||
508 | if (error) | |
509 | free_all_swap_pages(root_swap); | |
510 | release_swap_writer(handle); | |
511 | swsusp_close(FMODE_WRITE); | |
512 | ||
513 | return error; | |
514 | } | |
515 | ||
f996fc96 BS |
516 | /* We need to remember how much compressed data we need to read. */ |
517 | #define LZO_HEADER sizeof(size_t) | |
518 | ||
519 | /* Number of pages/bytes we'll compress at one time. */ | |
520 | #define LZO_UNC_PAGES 32 | |
521 | #define LZO_UNC_SIZE (LZO_UNC_PAGES * PAGE_SIZE) | |
522 | ||
523 | /* Number of pages/bytes we need for compressed data (worst case). */ | |
524 | #define LZO_CMP_PAGES DIV_ROUND_UP(lzo1x_worst_compress(LZO_UNC_SIZE) + \ | |
525 | LZO_HEADER, PAGE_SIZE) | |
526 | #define LZO_CMP_SIZE (LZO_CMP_PAGES * PAGE_SIZE) | |
527 | ||
081a9d04 BS |
528 | /* Maximum number of threads for compression/decompression. */ |
529 | #define LZO_THREADS 3 | |
530 | ||
5a21d489 BS |
531 | /* Minimum/maximum number of pages for read buffering. */ |
532 | #define LZO_MIN_RD_PAGES 1024 | |
533 | #define LZO_MAX_RD_PAGES 8192 | |
081a9d04 BS |
534 | |
535 | ||
61159a31 RW |
536 | /** |
537 | * save_image - save the suspend image data | |
538 | */ | |
539 | ||
540 | static int save_image(struct swap_map_handle *handle, | |
541 | struct snapshot_handle *snapshot, | |
3a4f7577 | 542 | unsigned int nr_to_write) |
61159a31 RW |
543 | { |
544 | unsigned int m; | |
545 | int ret; | |
3a4f7577 | 546 | int nr_pages; |
ab954160 | 547 | int err2; |
343df3c7 | 548 | struct hib_bio_batch hb; |
db597605 TR |
549 | ktime_t start; |
550 | ktime_t stop; | |
61159a31 | 551 | |
343df3c7 CH |
552 | hib_init_batch(&hb); |
553 | ||
64ec72a1 | 554 | pr_info("Saving image data pages (%u pages)...\n", |
23976728 | 555 | nr_to_write); |
d8150d35 | 556 | m = nr_to_write / 10; |
61159a31 RW |
557 | if (!m) |
558 | m = 1; | |
559 | nr_pages = 0; | |
db597605 | 560 | start = ktime_get(); |
4ff277f9 | 561 | while (1) { |
d3c1b24c | 562 | ret = snapshot_read_next(snapshot); |
4ff277f9 JS |
563 | if (ret <= 0) |
564 | break; | |
343df3c7 | 565 | ret = swap_write_page(handle, data_of(*snapshot), &hb); |
4ff277f9 JS |
566 | if (ret) |
567 | break; | |
568 | if (!(nr_pages % m)) | |
64ec72a1 JP |
569 | pr_info("Image saving progress: %3d%%\n", |
570 | nr_pages / m * 10); | |
4ff277f9 JS |
571 | nr_pages++; |
572 | } | |
343df3c7 | 573 | err2 = hib_wait_io(&hb); |
55c4478a | 574 | hib_finish_batch(&hb); |
db597605 | 575 | stop = ktime_get(); |
4ff277f9 JS |
576 | if (!ret) |
577 | ret = err2; | |
578 | if (!ret) | |
64ec72a1 | 579 | pr_info("Image saving done\n"); |
db597605 | 580 | swsusp_show_speed(start, stop, nr_to_write, "Wrote"); |
4ff277f9 | 581 | return ret; |
61159a31 RW |
582 | } |
583 | ||
6b37dfcb | 584 | /* |
081a9d04 BS |
585 | * Structure used for CRC32. |
586 | */ | |
587 | struct crc_data { | |
588 | struct task_struct *thr; /* thread */ | |
589 | atomic_t ready; /* ready to start flag */ | |
590 | atomic_t stop; /* ready to stop flag */ | |
591 | unsigned run_threads; /* nr current threads */ | |
592 | wait_queue_head_t go; /* start crc update */ | |
593 | wait_queue_head_t done; /* crc update done */ | |
594 | u32 *crc32; /* points to handle's crc32 */ | |
595 | size_t *unc_len[LZO_THREADS]; /* uncompressed lengths */ | |
596 | unsigned char *unc[LZO_THREADS]; /* uncompressed data */ | |
597 | }; | |
598 | ||
6b37dfcb | 599 | /* |
081a9d04 BS |
600 | * CRC32 update function that runs in its own thread. |
601 | */ | |
602 | static int crc32_threadfn(void *data) | |
603 | { | |
604 | struct crc_data *d = data; | |
605 | unsigned i; | |
606 | ||
607 | while (1) { | |
608 | wait_event(d->go, atomic_read(&d->ready) || | |
609 | kthread_should_stop()); | |
610 | if (kthread_should_stop()) { | |
611 | d->thr = NULL; | |
612 | atomic_set(&d->stop, 1); | |
613 | wake_up(&d->done); | |
614 | break; | |
615 | } | |
616 | atomic_set(&d->ready, 0); | |
617 | ||
618 | for (i = 0; i < d->run_threads; i++) | |
619 | *d->crc32 = crc32_le(*d->crc32, | |
620 | d->unc[i], *d->unc_len[i]); | |
621 | atomic_set(&d->stop, 1); | |
622 | wake_up(&d->done); | |
623 | } | |
624 | return 0; | |
625 | } | |
6b37dfcb | 626 | /* |
081a9d04 BS |
627 | * Structure used for LZO data compression. |
628 | */ | |
629 | struct cmp_data { | |
630 | struct task_struct *thr; /* thread */ | |
631 | atomic_t ready; /* ready to start flag */ | |
632 | atomic_t stop; /* ready to stop flag */ | |
633 | int ret; /* return code */ | |
634 | wait_queue_head_t go; /* start compression */ | |
635 | wait_queue_head_t done; /* compression done */ | |
636 | size_t unc_len; /* uncompressed length */ | |
637 | size_t cmp_len; /* compressed length */ | |
638 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ | |
639 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ | |
640 | unsigned char wrk[LZO1X_1_MEM_COMPRESS]; /* compression workspace */ | |
641 | }; | |
642 | ||
6b37dfcb | 643 | /* |
081a9d04 BS |
644 | * Compression function that runs in its own thread. |
645 | */ | |
646 | static int lzo_compress_threadfn(void *data) | |
647 | { | |
648 | struct cmp_data *d = data; | |
649 | ||
650 | while (1) { | |
651 | wait_event(d->go, atomic_read(&d->ready) || | |
652 | kthread_should_stop()); | |
653 | if (kthread_should_stop()) { | |
654 | d->thr = NULL; | |
655 | d->ret = -1; | |
656 | atomic_set(&d->stop, 1); | |
657 | wake_up(&d->done); | |
658 | break; | |
659 | } | |
660 | atomic_set(&d->ready, 0); | |
661 | ||
662 | d->ret = lzo1x_1_compress(d->unc, d->unc_len, | |
663 | d->cmp + LZO_HEADER, &d->cmp_len, | |
664 | d->wrk); | |
665 | atomic_set(&d->stop, 1); | |
666 | wake_up(&d->done); | |
667 | } | |
668 | return 0; | |
669 | } | |
f996fc96 BS |
670 | |
671 | /** | |
672 | * save_image_lzo - Save the suspend image data compressed with LZO. | |
057b0a75 | 673 | * @handle: Swap map handle to use for saving the image. |
f996fc96 BS |
674 | * @snapshot: Image to read data from. |
675 | * @nr_to_write: Number of pages to save. | |
676 | */ | |
677 | static int save_image_lzo(struct swap_map_handle *handle, | |
678 | struct snapshot_handle *snapshot, | |
679 | unsigned int nr_to_write) | |
680 | { | |
681 | unsigned int m; | |
682 | int ret = 0; | |
683 | int nr_pages; | |
684 | int err2; | |
343df3c7 | 685 | struct hib_bio_batch hb; |
db597605 TR |
686 | ktime_t start; |
687 | ktime_t stop; | |
081a9d04 BS |
688 | size_t off; |
689 | unsigned thr, run_threads, nr_threads; | |
690 | unsigned char *page = NULL; | |
691 | struct cmp_data *data = NULL; | |
692 | struct crc_data *crc = NULL; | |
693 | ||
343df3c7 CH |
694 | hib_init_batch(&hb); |
695 | ||
081a9d04 BS |
696 | /* |
697 | * We'll limit the number of threads for compression to limit memory | |
698 | * footprint. | |
699 | */ | |
700 | nr_threads = num_online_cpus() - 1; | |
701 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); | |
f996fc96 | 702 | |
0eb0b63c | 703 | page = (void *)__get_free_page(GFP_NOIO | __GFP_HIGH); |
f996fc96 | 704 | if (!page) { |
64ec72a1 | 705 | pr_err("Failed to allocate LZO page\n"); |
081a9d04 BS |
706 | ret = -ENOMEM; |
707 | goto out_clean; | |
f996fc96 BS |
708 | } |
709 | ||
9437e393 | 710 | data = vzalloc(array_size(nr_threads, sizeof(*data))); |
081a9d04 | 711 | if (!data) { |
64ec72a1 | 712 | pr_err("Failed to allocate LZO data\n"); |
081a9d04 BS |
713 | ret = -ENOMEM; |
714 | goto out_clean; | |
f996fc96 BS |
715 | } |
716 | ||
9437e393 | 717 | crc = kzalloc(sizeof(*crc), GFP_KERNEL); |
081a9d04 | 718 | if (!crc) { |
64ec72a1 | 719 | pr_err("Failed to allocate crc\n"); |
081a9d04 BS |
720 | ret = -ENOMEM; |
721 | goto out_clean; | |
722 | } | |
081a9d04 BS |
723 | |
724 | /* | |
725 | * Start the compression threads. | |
726 | */ | |
727 | for (thr = 0; thr < nr_threads; thr++) { | |
728 | init_waitqueue_head(&data[thr].go); | |
729 | init_waitqueue_head(&data[thr].done); | |
730 | ||
731 | data[thr].thr = kthread_run(lzo_compress_threadfn, | |
732 | &data[thr], | |
733 | "image_compress/%u", thr); | |
734 | if (IS_ERR(data[thr].thr)) { | |
735 | data[thr].thr = NULL; | |
64ec72a1 | 736 | pr_err("Cannot start compression threads\n"); |
081a9d04 BS |
737 | ret = -ENOMEM; |
738 | goto out_clean; | |
739 | } | |
f996fc96 BS |
740 | } |
741 | ||
081a9d04 BS |
742 | /* |
743 | * Start the CRC32 thread. | |
744 | */ | |
745 | init_waitqueue_head(&crc->go); | |
746 | init_waitqueue_head(&crc->done); | |
747 | ||
748 | handle->crc32 = 0; | |
749 | crc->crc32 = &handle->crc32; | |
750 | for (thr = 0; thr < nr_threads; thr++) { | |
751 | crc->unc[thr] = data[thr].unc; | |
752 | crc->unc_len[thr] = &data[thr].unc_len; | |
753 | } | |
754 | ||
755 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); | |
756 | if (IS_ERR(crc->thr)) { | |
757 | crc->thr = NULL; | |
64ec72a1 | 758 | pr_err("Cannot start CRC32 thread\n"); |
081a9d04 BS |
759 | ret = -ENOMEM; |
760 | goto out_clean; | |
f996fc96 BS |
761 | } |
762 | ||
5a21d489 BS |
763 | /* |
764 | * Adjust the number of required free pages after all allocations have | |
765 | * been done. We don't want to run out of pages when writing. | |
766 | */ | |
767 | handle->reqd_free_pages = reqd_free_pages(); | |
768 | ||
64ec72a1 JP |
769 | pr_info("Using %u thread(s) for compression\n", nr_threads); |
770 | pr_info("Compressing and saving image data (%u pages)...\n", | |
771 | nr_to_write); | |
d8150d35 | 772 | m = nr_to_write / 10; |
f996fc96 BS |
773 | if (!m) |
774 | m = 1; | |
775 | nr_pages = 0; | |
db597605 | 776 | start = ktime_get(); |
f996fc96 | 777 | for (;;) { |
081a9d04 BS |
778 | for (thr = 0; thr < nr_threads; thr++) { |
779 | for (off = 0; off < LZO_UNC_SIZE; off += PAGE_SIZE) { | |
780 | ret = snapshot_read_next(snapshot); | |
781 | if (ret < 0) | |
782 | goto out_finish; | |
783 | ||
784 | if (!ret) | |
785 | break; | |
786 | ||
787 | memcpy(data[thr].unc + off, | |
788 | data_of(*snapshot), PAGE_SIZE); | |
789 | ||
790 | if (!(nr_pages % m)) | |
64ec72a1 JP |
791 | pr_info("Image saving progress: %3d%%\n", |
792 | nr_pages / m * 10); | |
081a9d04 BS |
793 | nr_pages++; |
794 | } | |
795 | if (!off) | |
f996fc96 BS |
796 | break; |
797 | ||
081a9d04 | 798 | data[thr].unc_len = off; |
f996fc96 | 799 | |
081a9d04 BS |
800 | atomic_set(&data[thr].ready, 1); |
801 | wake_up(&data[thr].go); | |
f996fc96 BS |
802 | } |
803 | ||
081a9d04 | 804 | if (!thr) |
f996fc96 BS |
805 | break; |
806 | ||
081a9d04 BS |
807 | crc->run_threads = thr; |
808 | atomic_set(&crc->ready, 1); | |
809 | wake_up(&crc->go); | |
f996fc96 | 810 | |
081a9d04 BS |
811 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
812 | wait_event(data[thr].done, | |
813 | atomic_read(&data[thr].stop)); | |
814 | atomic_set(&data[thr].stop, 0); | |
f996fc96 | 815 | |
081a9d04 | 816 | ret = data[thr].ret; |
f996fc96 | 817 | |
081a9d04 | 818 | if (ret < 0) { |
64ec72a1 | 819 | pr_err("LZO compression failed\n"); |
081a9d04 BS |
820 | goto out_finish; |
821 | } | |
f996fc96 | 822 | |
081a9d04 BS |
823 | if (unlikely(!data[thr].cmp_len || |
824 | data[thr].cmp_len > | |
825 | lzo1x_worst_compress(data[thr].unc_len))) { | |
64ec72a1 | 826 | pr_err("Invalid LZO compressed length\n"); |
081a9d04 | 827 | ret = -1; |
f996fc96 | 828 | goto out_finish; |
081a9d04 BS |
829 | } |
830 | ||
831 | *(size_t *)data[thr].cmp = data[thr].cmp_len; | |
832 | ||
833 | /* | |
834 | * Given we are writing one page at a time to disk, we | |
835 | * copy that much from the buffer, although the last | |
836 | * bit will likely be smaller than full page. This is | |
837 | * OK - we saved the length of the compressed data, so | |
838 | * any garbage at the end will be discarded when we | |
839 | * read it. | |
840 | */ | |
841 | for (off = 0; | |
842 | off < LZO_HEADER + data[thr].cmp_len; | |
843 | off += PAGE_SIZE) { | |
844 | memcpy(page, data[thr].cmp + off, PAGE_SIZE); | |
845 | ||
343df3c7 | 846 | ret = swap_write_page(handle, page, &hb); |
081a9d04 BS |
847 | if (ret) |
848 | goto out_finish; | |
849 | } | |
f996fc96 | 850 | } |
081a9d04 BS |
851 | |
852 | wait_event(crc->done, atomic_read(&crc->stop)); | |
853 | atomic_set(&crc->stop, 0); | |
f996fc96 BS |
854 | } |
855 | ||
856 | out_finish: | |
343df3c7 | 857 | err2 = hib_wait_io(&hb); |
db597605 | 858 | stop = ktime_get(); |
f996fc96 BS |
859 | if (!ret) |
860 | ret = err2; | |
d8150d35 | 861 | if (!ret) |
64ec72a1 | 862 | pr_info("Image saving done\n"); |
db597605 | 863 | swsusp_show_speed(start, stop, nr_to_write, "Wrote"); |
081a9d04 | 864 | out_clean: |
55c4478a | 865 | hib_finish_batch(&hb); |
081a9d04 BS |
866 | if (crc) { |
867 | if (crc->thr) | |
868 | kthread_stop(crc->thr); | |
869 | kfree(crc); | |
870 | } | |
871 | if (data) { | |
872 | for (thr = 0; thr < nr_threads; thr++) | |
873 | if (data[thr].thr) | |
874 | kthread_stop(data[thr].thr); | |
875 | vfree(data); | |
876 | } | |
877 | if (page) free_page((unsigned long)page); | |
f996fc96 BS |
878 | |
879 | return ret; | |
880 | } | |
881 | ||
61159a31 RW |
882 | /** |
883 | * enough_swap - Make sure we have enough swap to save the image. | |
884 | * | |
885 | * Returns TRUE or FALSE after checking the total amount of swap | |
e4b2897a | 886 | * space available from the resume partition. |
61159a31 RW |
887 | */ |
888 | ||
8ffdfe35 | 889 | static int enough_swap(unsigned int nr_pages) |
61159a31 RW |
890 | { |
891 | unsigned int free_swap = count_swap_pages(root_swap, 1); | |
f996fc96 | 892 | unsigned int required; |
61159a31 | 893 | |
64ec72a1 | 894 | pr_debug("Free swap pages: %u\n", free_swap); |
f996fc96 | 895 | |
ee34a370 | 896 | required = PAGES_FOR_IO + nr_pages; |
f996fc96 | 897 | return free_swap > required; |
61159a31 RW |
898 | } |
899 | ||
900 | /** | |
901 | * swsusp_write - Write entire image and metadata. | |
a634cc10 | 902 | * @flags: flags to pass to the "boot" kernel in the image header |
61159a31 RW |
903 | * |
904 | * It is important _NOT_ to umount filesystems at this point. We want | |
905 | * them synced (in case something goes wrong) but we DO not want to mark | |
906 | * filesystem clean: it is not. (And it does not matter, if we resume | |
907 | * correctly, we'll mark system clean, anyway.) | |
908 | */ | |
909 | ||
a634cc10 | 910 | int swsusp_write(unsigned int flags) |
61159a31 RW |
911 | { |
912 | struct swap_map_handle handle; | |
913 | struct snapshot_handle snapshot; | |
914 | struct swsusp_info *header; | |
6f612af5 | 915 | unsigned long pages; |
61159a31 RW |
916 | int error; |
917 | ||
6f612af5 JS |
918 | pages = snapshot_get_image_size(); |
919 | error = get_swap_writer(&handle); | |
3aef83e0 | 920 | if (error) { |
64ec72a1 | 921 | pr_err("Cannot get swap writer\n"); |
61159a31 RW |
922 | return error; |
923 | } | |
ee34a370 | 924 | if (flags & SF_NOCOMPRESS_MODE) { |
8ffdfe35 | 925 | if (!enough_swap(pages)) { |
64ec72a1 | 926 | pr_err("Not enough free swap\n"); |
ee34a370 BS |
927 | error = -ENOSPC; |
928 | goto out_finish; | |
929 | } | |
6f612af5 | 930 | } |
61159a31 | 931 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 932 | error = snapshot_read_next(&snapshot); |
d5641c64 | 933 | if (error < (int)PAGE_SIZE) { |
3aef83e0 RW |
934 | if (error >= 0) |
935 | error = -EFAULT; | |
936 | ||
6f612af5 | 937 | goto out_finish; |
3aef83e0 | 938 | } |
61159a31 | 939 | header = (struct swsusp_info *)data_of(snapshot); |
6f612af5 | 940 | error = swap_write_page(&handle, header, NULL); |
f996fc96 BS |
941 | if (!error) { |
942 | error = (flags & SF_NOCOMPRESS_MODE) ? | |
943 | save_image(&handle, &snapshot, pages - 1) : | |
944 | save_image_lzo(&handle, &snapshot, pages - 1); | |
945 | } | |
6f612af5 JS |
946 | out_finish: |
947 | error = swap_writer_finish(&handle, flags, error); | |
61159a31 RW |
948 | return error; |
949 | } | |
950 | ||
6b37dfcb | 951 | /* |
61159a31 | 952 | * The following functions allow us to read data using a swap map |
6b37dfcb | 953 | * in a file-like way. |
61159a31 RW |
954 | */ |
955 | ||
956 | static void release_swap_reader(struct swap_map_handle *handle) | |
957 | { | |
081a9d04 BS |
958 | struct swap_map_page_list *tmp; |
959 | ||
960 | while (handle->maps) { | |
961 | if (handle->maps->map) | |
962 | free_page((unsigned long)handle->maps->map); | |
963 | tmp = handle->maps; | |
964 | handle->maps = handle->maps->next; | |
965 | kfree(tmp); | |
966 | } | |
61159a31 RW |
967 | handle->cur = NULL; |
968 | } | |
969 | ||
6f612af5 JS |
970 | static int get_swap_reader(struct swap_map_handle *handle, |
971 | unsigned int *flags_p) | |
61159a31 RW |
972 | { |
973 | int error; | |
081a9d04 BS |
974 | struct swap_map_page_list *tmp, *last; |
975 | sector_t offset; | |
61159a31 | 976 | |
6f612af5 JS |
977 | *flags_p = swsusp_header->flags; |
978 | ||
979 | if (!swsusp_header->image) /* how can this happen? */ | |
61159a31 | 980 | return -EINVAL; |
3aef83e0 | 981 | |
081a9d04 BS |
982 | handle->cur = NULL; |
983 | last = handle->maps = NULL; | |
984 | offset = swsusp_header->image; | |
985 | while (offset) { | |
2f02a7ec | 986 | tmp = kzalloc(sizeof(*handle->maps), GFP_KERNEL); |
081a9d04 BS |
987 | if (!tmp) { |
988 | release_swap_reader(handle); | |
989 | return -ENOMEM; | |
990 | } | |
081a9d04 BS |
991 | if (!handle->maps) |
992 | handle->maps = tmp; | |
993 | if (last) | |
994 | last->next = tmp; | |
995 | last = tmp; | |
996 | ||
997 | tmp->map = (struct swap_map_page *) | |
0eb0b63c | 998 | __get_free_page(GFP_NOIO | __GFP_HIGH); |
081a9d04 BS |
999 | if (!tmp->map) { |
1000 | release_swap_reader(handle); | |
1001 | return -ENOMEM; | |
1002 | } | |
3aef83e0 | 1003 | |
568e34ed | 1004 | error = hib_submit_io(REQ_OP_READ, offset, tmp->map, NULL); |
081a9d04 BS |
1005 | if (error) { |
1006 | release_swap_reader(handle); | |
1007 | return error; | |
1008 | } | |
1009 | offset = tmp->map->next_swap; | |
61159a31 RW |
1010 | } |
1011 | handle->k = 0; | |
081a9d04 | 1012 | handle->cur = handle->maps->map; |
61159a31 RW |
1013 | return 0; |
1014 | } | |
1015 | ||
546e0d27 | 1016 | static int swap_read_page(struct swap_map_handle *handle, void *buf, |
343df3c7 | 1017 | struct hib_bio_batch *hb) |
61159a31 | 1018 | { |
3aef83e0 | 1019 | sector_t offset; |
61159a31 | 1020 | int error; |
081a9d04 | 1021 | struct swap_map_page_list *tmp; |
61159a31 RW |
1022 | |
1023 | if (!handle->cur) | |
1024 | return -EINVAL; | |
1025 | offset = handle->cur->entries[handle->k]; | |
1026 | if (!offset) | |
1027 | return -EFAULT; | |
568e34ed | 1028 | error = hib_submit_io(REQ_OP_READ, offset, buf, hb); |
61159a31 RW |
1029 | if (error) |
1030 | return error; | |
1031 | if (++handle->k >= MAP_PAGE_ENTRIES) { | |
1032 | handle->k = 0; | |
081a9d04 BS |
1033 | free_page((unsigned long)handle->maps->map); |
1034 | tmp = handle->maps; | |
1035 | handle->maps = handle->maps->next; | |
1036 | kfree(tmp); | |
1037 | if (!handle->maps) | |
61159a31 | 1038 | release_swap_reader(handle); |
081a9d04 BS |
1039 | else |
1040 | handle->cur = handle->maps->map; | |
61159a31 RW |
1041 | } |
1042 | return error; | |
1043 | } | |
1044 | ||
6f612af5 JS |
1045 | static int swap_reader_finish(struct swap_map_handle *handle) |
1046 | { | |
1047 | release_swap_reader(handle); | |
1048 | ||
1049 | return 0; | |
1050 | } | |
1051 | ||
61159a31 RW |
1052 | /** |
1053 | * load_image - load the image using the swap map handle | |
1054 | * @handle and the snapshot handle @snapshot | |
1055 | * (assume there are @nr_pages pages to load) | |
1056 | */ | |
1057 | ||
1058 | static int load_image(struct swap_map_handle *handle, | |
1059 | struct snapshot_handle *snapshot, | |
546e0d27 | 1060 | unsigned int nr_to_read) |
61159a31 RW |
1061 | { |
1062 | unsigned int m; | |
081a9d04 | 1063 | int ret = 0; |
db597605 TR |
1064 | ktime_t start; |
1065 | ktime_t stop; | |
343df3c7 | 1066 | struct hib_bio_batch hb; |
546e0d27 AM |
1067 | int err2; |
1068 | unsigned nr_pages; | |
61159a31 | 1069 | |
343df3c7 CH |
1070 | hib_init_batch(&hb); |
1071 | ||
f6cf0545 | 1072 | clean_pages_on_read = true; |
64ec72a1 | 1073 | pr_info("Loading image data pages (%u pages)...\n", nr_to_read); |
d8150d35 | 1074 | m = nr_to_read / 10; |
61159a31 RW |
1075 | if (!m) |
1076 | m = 1; | |
1077 | nr_pages = 0; | |
db597605 | 1078 | start = ktime_get(); |
546e0d27 | 1079 | for ( ; ; ) { |
081a9d04 BS |
1080 | ret = snapshot_write_next(snapshot); |
1081 | if (ret <= 0) | |
546e0d27 | 1082 | break; |
343df3c7 | 1083 | ret = swap_read_page(handle, data_of(*snapshot), &hb); |
081a9d04 | 1084 | if (ret) |
546e0d27 AM |
1085 | break; |
1086 | if (snapshot->sync_read) | |
343df3c7 | 1087 | ret = hib_wait_io(&hb); |
081a9d04 | 1088 | if (ret) |
546e0d27 AM |
1089 | break; |
1090 | if (!(nr_pages % m)) | |
64ec72a1 JP |
1091 | pr_info("Image loading progress: %3d%%\n", |
1092 | nr_pages / m * 10); | |
546e0d27 AM |
1093 | nr_pages++; |
1094 | } | |
343df3c7 | 1095 | err2 = hib_wait_io(&hb); |
55c4478a | 1096 | hib_finish_batch(&hb); |
db597605 | 1097 | stop = ktime_get(); |
081a9d04 BS |
1098 | if (!ret) |
1099 | ret = err2; | |
1100 | if (!ret) { | |
64ec72a1 | 1101 | pr_info("Image loading done\n"); |
8357376d | 1102 | snapshot_write_finalize(snapshot); |
e655a250 | 1103 | if (!snapshot_image_loaded(snapshot)) |
081a9d04 | 1104 | ret = -ENODATA; |
d8150d35 | 1105 | } |
db597605 | 1106 | swsusp_show_speed(start, stop, nr_to_read, "Read"); |
081a9d04 BS |
1107 | return ret; |
1108 | } | |
1109 | ||
6b37dfcb | 1110 | /* |
081a9d04 BS |
1111 | * Structure used for LZO data decompression. |
1112 | */ | |
1113 | struct dec_data { | |
1114 | struct task_struct *thr; /* thread */ | |
1115 | atomic_t ready; /* ready to start flag */ | |
1116 | atomic_t stop; /* ready to stop flag */ | |
1117 | int ret; /* return code */ | |
1118 | wait_queue_head_t go; /* start decompression */ | |
1119 | wait_queue_head_t done; /* decompression done */ | |
1120 | size_t unc_len; /* uncompressed length */ | |
1121 | size_t cmp_len; /* compressed length */ | |
1122 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ | |
1123 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ | |
1124 | }; | |
1125 | ||
6b37dfcb | 1126 | /* |
6be2408a | 1127 | * Decompression function that runs in its own thread. |
081a9d04 BS |
1128 | */ |
1129 | static int lzo_decompress_threadfn(void *data) | |
1130 | { | |
1131 | struct dec_data *d = data; | |
1132 | ||
1133 | while (1) { | |
1134 | wait_event(d->go, atomic_read(&d->ready) || | |
1135 | kthread_should_stop()); | |
1136 | if (kthread_should_stop()) { | |
1137 | d->thr = NULL; | |
1138 | d->ret = -1; | |
1139 | atomic_set(&d->stop, 1); | |
1140 | wake_up(&d->done); | |
1141 | break; | |
1142 | } | |
1143 | atomic_set(&d->ready, 0); | |
1144 | ||
1145 | d->unc_len = LZO_UNC_SIZE; | |
1146 | d->ret = lzo1x_decompress_safe(d->cmp + LZO_HEADER, d->cmp_len, | |
1147 | d->unc, &d->unc_len); | |
f6cf0545 JM |
1148 | if (clean_pages_on_decompress) |
1149 | flush_icache_range((unsigned long)d->unc, | |
1150 | (unsigned long)d->unc + d->unc_len); | |
1151 | ||
081a9d04 BS |
1152 | atomic_set(&d->stop, 1); |
1153 | wake_up(&d->done); | |
1154 | } | |
1155 | return 0; | |
61159a31 RW |
1156 | } |
1157 | ||
f996fc96 BS |
1158 | /** |
1159 | * load_image_lzo - Load compressed image data and decompress them with LZO. | |
1160 | * @handle: Swap map handle to use for loading data. | |
1161 | * @snapshot: Image to copy uncompressed data into. | |
1162 | * @nr_to_read: Number of pages to load. | |
1163 | */ | |
1164 | static int load_image_lzo(struct swap_map_handle *handle, | |
1165 | struct snapshot_handle *snapshot, | |
1166 | unsigned int nr_to_read) | |
1167 | { | |
1168 | unsigned int m; | |
081a9d04 BS |
1169 | int ret = 0; |
1170 | int eof = 0; | |
343df3c7 | 1171 | struct hib_bio_batch hb; |
db597605 TR |
1172 | ktime_t start; |
1173 | ktime_t stop; | |
f996fc96 | 1174 | unsigned nr_pages; |
081a9d04 BS |
1175 | size_t off; |
1176 | unsigned i, thr, run_threads, nr_threads; | |
1177 | unsigned ring = 0, pg = 0, ring_size = 0, | |
1178 | have = 0, want, need, asked = 0; | |
5a21d489 | 1179 | unsigned long read_pages = 0; |
081a9d04 BS |
1180 | unsigned char **page = NULL; |
1181 | struct dec_data *data = NULL; | |
1182 | struct crc_data *crc = NULL; | |
1183 | ||
343df3c7 CH |
1184 | hib_init_batch(&hb); |
1185 | ||
081a9d04 BS |
1186 | /* |
1187 | * We'll limit the number of threads for decompression to limit memory | |
1188 | * footprint. | |
1189 | */ | |
1190 | nr_threads = num_online_cpus() - 1; | |
1191 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); | |
1192 | ||
42bc47b3 | 1193 | page = vmalloc(array_size(LZO_MAX_RD_PAGES, sizeof(*page))); |
081a9d04 | 1194 | if (!page) { |
64ec72a1 | 1195 | pr_err("Failed to allocate LZO page\n"); |
081a9d04 BS |
1196 | ret = -ENOMEM; |
1197 | goto out_clean; | |
1198 | } | |
9f339caf | 1199 | |
9437e393 | 1200 | data = vzalloc(array_size(nr_threads, sizeof(*data))); |
081a9d04 | 1201 | if (!data) { |
64ec72a1 | 1202 | pr_err("Failed to allocate LZO data\n"); |
081a9d04 BS |
1203 | ret = -ENOMEM; |
1204 | goto out_clean; | |
1205 | } | |
9f339caf | 1206 | |
9437e393 | 1207 | crc = kzalloc(sizeof(*crc), GFP_KERNEL); |
081a9d04 | 1208 | if (!crc) { |
64ec72a1 | 1209 | pr_err("Failed to allocate crc\n"); |
081a9d04 BS |
1210 | ret = -ENOMEM; |
1211 | goto out_clean; | |
1212 | } | |
081a9d04 | 1213 | |
f6cf0545 JM |
1214 | clean_pages_on_decompress = true; |
1215 | ||
081a9d04 BS |
1216 | /* |
1217 | * Start the decompression threads. | |
1218 | */ | |
1219 | for (thr = 0; thr < nr_threads; thr++) { | |
1220 | init_waitqueue_head(&data[thr].go); | |
1221 | init_waitqueue_head(&data[thr].done); | |
1222 | ||
1223 | data[thr].thr = kthread_run(lzo_decompress_threadfn, | |
1224 | &data[thr], | |
1225 | "image_decompress/%u", thr); | |
1226 | if (IS_ERR(data[thr].thr)) { | |
1227 | data[thr].thr = NULL; | |
64ec72a1 | 1228 | pr_err("Cannot start decompression threads\n"); |
081a9d04 BS |
1229 | ret = -ENOMEM; |
1230 | goto out_clean; | |
9f339caf | 1231 | } |
f996fc96 BS |
1232 | } |
1233 | ||
081a9d04 BS |
1234 | /* |
1235 | * Start the CRC32 thread. | |
1236 | */ | |
1237 | init_waitqueue_head(&crc->go); | |
1238 | init_waitqueue_head(&crc->done); | |
1239 | ||
1240 | handle->crc32 = 0; | |
1241 | crc->crc32 = &handle->crc32; | |
1242 | for (thr = 0; thr < nr_threads; thr++) { | |
1243 | crc->unc[thr] = data[thr].unc; | |
1244 | crc->unc_len[thr] = &data[thr].unc_len; | |
f996fc96 BS |
1245 | } |
1246 | ||
081a9d04 BS |
1247 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); |
1248 | if (IS_ERR(crc->thr)) { | |
1249 | crc->thr = NULL; | |
64ec72a1 | 1250 | pr_err("Cannot start CRC32 thread\n"); |
081a9d04 BS |
1251 | ret = -ENOMEM; |
1252 | goto out_clean; | |
1253 | } | |
9f339caf | 1254 | |
081a9d04 | 1255 | /* |
5a21d489 BS |
1256 | * Set the number of pages for read buffering. |
1257 | * This is complete guesswork, because we'll only know the real | |
1258 | * picture once prepare_image() is called, which is much later on | |
1259 | * during the image load phase. We'll assume the worst case and | |
1260 | * say that none of the image pages are from high memory. | |
081a9d04 | 1261 | */ |
5a21d489 BS |
1262 | if (low_free_pages() > snapshot_get_image_size()) |
1263 | read_pages = (low_free_pages() - snapshot_get_image_size()) / 2; | |
1264 | read_pages = clamp_val(read_pages, LZO_MIN_RD_PAGES, LZO_MAX_RD_PAGES); | |
9f339caf | 1265 | |
081a9d04 BS |
1266 | for (i = 0; i < read_pages; i++) { |
1267 | page[i] = (void *)__get_free_page(i < LZO_CMP_PAGES ? | |
0eb0b63c CH |
1268 | GFP_NOIO | __GFP_HIGH : |
1269 | GFP_NOIO | __GFP_NOWARN | | |
71baba4b | 1270 | __GFP_NORETRY); |
5a21d489 | 1271 | |
081a9d04 BS |
1272 | if (!page[i]) { |
1273 | if (i < LZO_CMP_PAGES) { | |
1274 | ring_size = i; | |
64ec72a1 | 1275 | pr_err("Failed to allocate LZO pages\n"); |
081a9d04 BS |
1276 | ret = -ENOMEM; |
1277 | goto out_clean; | |
1278 | } else { | |
1279 | break; | |
1280 | } | |
1281 | } | |
f996fc96 | 1282 | } |
081a9d04 | 1283 | want = ring_size = i; |
f996fc96 | 1284 | |
64ec72a1 JP |
1285 | pr_info("Using %u thread(s) for decompression\n", nr_threads); |
1286 | pr_info("Loading and decompressing image data (%u pages)...\n", | |
1287 | nr_to_read); | |
d8150d35 | 1288 | m = nr_to_read / 10; |
f996fc96 BS |
1289 | if (!m) |
1290 | m = 1; | |
1291 | nr_pages = 0; | |
db597605 | 1292 | start = ktime_get(); |
f996fc96 | 1293 | |
081a9d04 BS |
1294 | ret = snapshot_write_next(snapshot); |
1295 | if (ret <= 0) | |
f996fc96 BS |
1296 | goto out_finish; |
1297 | ||
081a9d04 BS |
1298 | for(;;) { |
1299 | for (i = 0; !eof && i < want; i++) { | |
343df3c7 | 1300 | ret = swap_read_page(handle, page[ring], &hb); |
081a9d04 BS |
1301 | if (ret) { |
1302 | /* | |
1303 | * On real read error, finish. On end of data, | |
1304 | * set EOF flag and just exit the read loop. | |
1305 | */ | |
1306 | if (handle->cur && | |
1307 | handle->cur->entries[handle->k]) { | |
1308 | goto out_finish; | |
1309 | } else { | |
1310 | eof = 1; | |
1311 | break; | |
1312 | } | |
1313 | } | |
1314 | if (++ring >= ring_size) | |
1315 | ring = 0; | |
f996fc96 | 1316 | } |
081a9d04 BS |
1317 | asked += i; |
1318 | want -= i; | |
f996fc96 | 1319 | |
081a9d04 BS |
1320 | /* |
1321 | * We are out of data, wait for some more. | |
1322 | */ | |
1323 | if (!have) { | |
1324 | if (!asked) | |
1325 | break; | |
1326 | ||
343df3c7 | 1327 | ret = hib_wait_io(&hb); |
081a9d04 | 1328 | if (ret) |
f996fc96 | 1329 | goto out_finish; |
081a9d04 BS |
1330 | have += asked; |
1331 | asked = 0; | |
1332 | if (eof) | |
1333 | eof = 2; | |
9f339caf | 1334 | } |
f996fc96 | 1335 | |
081a9d04 BS |
1336 | if (crc->run_threads) { |
1337 | wait_event(crc->done, atomic_read(&crc->stop)); | |
1338 | atomic_set(&crc->stop, 0); | |
1339 | crc->run_threads = 0; | |
f996fc96 BS |
1340 | } |
1341 | ||
081a9d04 BS |
1342 | for (thr = 0; have && thr < nr_threads; thr++) { |
1343 | data[thr].cmp_len = *(size_t *)page[pg]; | |
1344 | if (unlikely(!data[thr].cmp_len || | |
1345 | data[thr].cmp_len > | |
1346 | lzo1x_worst_compress(LZO_UNC_SIZE))) { | |
64ec72a1 | 1347 | pr_err("Invalid LZO compressed length\n"); |
081a9d04 BS |
1348 | ret = -1; |
1349 | goto out_finish; | |
1350 | } | |
1351 | ||
1352 | need = DIV_ROUND_UP(data[thr].cmp_len + LZO_HEADER, | |
1353 | PAGE_SIZE); | |
1354 | if (need > have) { | |
1355 | if (eof > 1) { | |
1356 | ret = -1; | |
1357 | goto out_finish; | |
1358 | } | |
1359 | break; | |
1360 | } | |
1361 | ||
1362 | for (off = 0; | |
1363 | off < LZO_HEADER + data[thr].cmp_len; | |
1364 | off += PAGE_SIZE) { | |
1365 | memcpy(data[thr].cmp + off, | |
1366 | page[pg], PAGE_SIZE); | |
1367 | have--; | |
1368 | want++; | |
1369 | if (++pg >= ring_size) | |
1370 | pg = 0; | |
1371 | } | |
1372 | ||
1373 | atomic_set(&data[thr].ready, 1); | |
1374 | wake_up(&data[thr].go); | |
f996fc96 BS |
1375 | } |
1376 | ||
081a9d04 BS |
1377 | /* |
1378 | * Wait for more data while we are decompressing. | |
1379 | */ | |
1380 | if (have < LZO_CMP_PAGES && asked) { | |
343df3c7 | 1381 | ret = hib_wait_io(&hb); |
081a9d04 BS |
1382 | if (ret) |
1383 | goto out_finish; | |
1384 | have += asked; | |
1385 | asked = 0; | |
1386 | if (eof) | |
1387 | eof = 2; | |
f996fc96 BS |
1388 | } |
1389 | ||
081a9d04 BS |
1390 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
1391 | wait_event(data[thr].done, | |
1392 | atomic_read(&data[thr].stop)); | |
1393 | atomic_set(&data[thr].stop, 0); | |
1394 | ||
1395 | ret = data[thr].ret; | |
f996fc96 | 1396 | |
081a9d04 | 1397 | if (ret < 0) { |
64ec72a1 | 1398 | pr_err("LZO decompression failed\n"); |
081a9d04 BS |
1399 | goto out_finish; |
1400 | } | |
f996fc96 | 1401 | |
081a9d04 BS |
1402 | if (unlikely(!data[thr].unc_len || |
1403 | data[thr].unc_len > LZO_UNC_SIZE || | |
1404 | data[thr].unc_len & (PAGE_SIZE - 1))) { | |
64ec72a1 | 1405 | pr_err("Invalid LZO uncompressed length\n"); |
081a9d04 | 1406 | ret = -1; |
f996fc96 | 1407 | goto out_finish; |
081a9d04 BS |
1408 | } |
1409 | ||
1410 | for (off = 0; | |
1411 | off < data[thr].unc_len; off += PAGE_SIZE) { | |
1412 | memcpy(data_of(*snapshot), | |
1413 | data[thr].unc + off, PAGE_SIZE); | |
1414 | ||
1415 | if (!(nr_pages % m)) | |
64ec72a1 JP |
1416 | pr_info("Image loading progress: %3d%%\n", |
1417 | nr_pages / m * 10); | |
081a9d04 BS |
1418 | nr_pages++; |
1419 | ||
1420 | ret = snapshot_write_next(snapshot); | |
1421 | if (ret <= 0) { | |
1422 | crc->run_threads = thr + 1; | |
1423 | atomic_set(&crc->ready, 1); | |
1424 | wake_up(&crc->go); | |
1425 | goto out_finish; | |
1426 | } | |
1427 | } | |
f996fc96 | 1428 | } |
081a9d04 BS |
1429 | |
1430 | crc->run_threads = thr; | |
1431 | atomic_set(&crc->ready, 1); | |
1432 | wake_up(&crc->go); | |
f996fc96 BS |
1433 | } |
1434 | ||
1435 | out_finish: | |
081a9d04 BS |
1436 | if (crc->run_threads) { |
1437 | wait_event(crc->done, atomic_read(&crc->stop)); | |
1438 | atomic_set(&crc->stop, 0); | |
1439 | } | |
db597605 | 1440 | stop = ktime_get(); |
081a9d04 | 1441 | if (!ret) { |
64ec72a1 | 1442 | pr_info("Image loading done\n"); |
f996fc96 BS |
1443 | snapshot_write_finalize(snapshot); |
1444 | if (!snapshot_image_loaded(snapshot)) | |
081a9d04 BS |
1445 | ret = -ENODATA; |
1446 | if (!ret) { | |
1447 | if (swsusp_header->flags & SF_CRC32_MODE) { | |
1448 | if(handle->crc32 != swsusp_header->crc32) { | |
64ec72a1 | 1449 | pr_err("Invalid image CRC32!\n"); |
081a9d04 BS |
1450 | ret = -ENODATA; |
1451 | } | |
1452 | } | |
1453 | } | |
d8150d35 | 1454 | } |
db597605 | 1455 | swsusp_show_speed(start, stop, nr_to_read, "Read"); |
081a9d04 | 1456 | out_clean: |
55c4478a | 1457 | hib_finish_batch(&hb); |
081a9d04 | 1458 | for (i = 0; i < ring_size; i++) |
9f339caf | 1459 | free_page((unsigned long)page[i]); |
081a9d04 BS |
1460 | if (crc) { |
1461 | if (crc->thr) | |
1462 | kthread_stop(crc->thr); | |
1463 | kfree(crc); | |
1464 | } | |
1465 | if (data) { | |
1466 | for (thr = 0; thr < nr_threads; thr++) | |
1467 | if (data[thr].thr) | |
1468 | kthread_stop(data[thr].thr); | |
1469 | vfree(data); | |
1470 | } | |
6c45de0d | 1471 | vfree(page); |
f996fc96 | 1472 | |
081a9d04 | 1473 | return ret; |
f996fc96 BS |
1474 | } |
1475 | ||
a634cc10 RW |
1476 | /** |
1477 | * swsusp_read - read the hibernation image. | |
1478 | * @flags_p: flags passed by the "frozen" kernel in the image header should | |
b595076a | 1479 | * be written into this memory location |
a634cc10 RW |
1480 | */ |
1481 | ||
1482 | int swsusp_read(unsigned int *flags_p) | |
61159a31 RW |
1483 | { |
1484 | int error; | |
1485 | struct swap_map_handle handle; | |
1486 | struct snapshot_handle snapshot; | |
1487 | struct swsusp_info *header; | |
1488 | ||
61159a31 | 1489 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 1490 | error = snapshot_write_next(&snapshot); |
d5641c64 | 1491 | if (error < (int)PAGE_SIZE) |
61159a31 RW |
1492 | return error < 0 ? error : -EFAULT; |
1493 | header = (struct swsusp_info *)data_of(snapshot); | |
6f612af5 JS |
1494 | error = get_swap_reader(&handle, flags_p); |
1495 | if (error) | |
1496 | goto end; | |
61159a31 | 1497 | if (!error) |
546e0d27 | 1498 | error = swap_read_page(&handle, header, NULL); |
f996fc96 BS |
1499 | if (!error) { |
1500 | error = (*flags_p & SF_NOCOMPRESS_MODE) ? | |
1501 | load_image(&handle, &snapshot, header->pages - 1) : | |
1502 | load_image_lzo(&handle, &snapshot, header->pages - 1); | |
1503 | } | |
6f612af5 JS |
1504 | swap_reader_finish(&handle); |
1505 | end: | |
61159a31 | 1506 | if (!error) |
64ec72a1 | 1507 | pr_debug("Image successfully loaded\n"); |
61159a31 | 1508 | else |
64ec72a1 | 1509 | pr_debug("Error %d resuming\n", error); |
61159a31 RW |
1510 | return error; |
1511 | } | |
1512 | ||
1513 | /** | |
1514 | * swsusp_check - Check for swsusp signature in the resume device | |
1515 | */ | |
1516 | ||
1517 | int swsusp_check(void) | |
1518 | { | |
1519 | int error; | |
39fbef4b | 1520 | void *holder; |
61159a31 | 1521 | |
d4d77629 | 1522 | hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device, |
39fbef4b | 1523 | FMODE_READ | FMODE_EXCL, &holder); |
8a0d613f JS |
1524 | if (!IS_ERR(hib_resume_bdev)) { |
1525 | set_blocksize(hib_resume_bdev, PAGE_SIZE); | |
3ecb01df | 1526 | clear_page(swsusp_header); |
568e34ed | 1527 | error = hib_submit_io(REQ_OP_READ, swsusp_resume_block, |
1b29c164 | 1528 | swsusp_header, NULL); |
9a154d9d | 1529 | if (error) |
76b57e61 | 1530 | goto put; |
9a154d9d | 1531 | |
3624eb04 | 1532 | if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) { |
1b29c164 | 1533 | memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10); |
61159a31 | 1534 | /* Reset swap signature now */ |
568e34ed | 1535 | error = hib_submit_io(REQ_OP_WRITE | REQ_SYNC, |
162b99e3 | 1536 | swsusp_resume_block, |
1b29c164 | 1537 | swsusp_header, NULL); |
61159a31 | 1538 | } else { |
76b57e61 | 1539 | error = -EINVAL; |
61159a31 | 1540 | } |
74d95555 DW |
1541 | if (!error && swsusp_header->flags & SF_HW_SIG && |
1542 | swsusp_header->hw_sig != swsusp_hardware_signature) { | |
1543 | pr_info("Suspend image hardware signature mismatch (%08x now %08x); aborting resume.\n", | |
1544 | swsusp_header->hw_sig, swsusp_hardware_signature); | |
1545 | error = -EINVAL; | |
1546 | } | |
76b57e61 JS |
1547 | |
1548 | put: | |
61159a31 | 1549 | if (error) |
39fbef4b | 1550 | blkdev_put(hib_resume_bdev, FMODE_READ | FMODE_EXCL); |
61159a31 | 1551 | else |
64ec72a1 | 1552 | pr_debug("Image signature found, resuming\n"); |
61159a31 | 1553 | } else { |
8a0d613f | 1554 | error = PTR_ERR(hib_resume_bdev); |
61159a31 RW |
1555 | } |
1556 | ||
1557 | if (error) | |
64ec72a1 | 1558 | pr_debug("Image not found (code %d)\n", error); |
61159a31 RW |
1559 | |
1560 | return error; | |
1561 | } | |
1562 | ||
1563 | /** | |
1564 | * swsusp_close - close swap device. | |
1565 | */ | |
1566 | ||
c2dd0dae | 1567 | void swsusp_close(fmode_t mode) |
61159a31 | 1568 | { |
8a0d613f | 1569 | if (IS_ERR(hib_resume_bdev)) { |
64ec72a1 | 1570 | pr_debug("Image device not initialised\n"); |
61159a31 RW |
1571 | return; |
1572 | } | |
1573 | ||
8a0d613f | 1574 | blkdev_put(hib_resume_bdev, mode); |
61159a31 | 1575 | } |
1b29c164 | 1576 | |
62c552cc BS |
1577 | /** |
1578 | * swsusp_unmark - Unmark swsusp signature in the resume device | |
1579 | */ | |
1580 | ||
1581 | #ifdef CONFIG_SUSPEND | |
1582 | int swsusp_unmark(void) | |
1583 | { | |
1584 | int error; | |
1585 | ||
568e34ed BVA |
1586 | hib_submit_io(REQ_OP_READ, swsusp_resume_block, |
1587 | swsusp_header, NULL); | |
62c552cc BS |
1588 | if (!memcmp(HIBERNATE_SIG,swsusp_header->sig, 10)) { |
1589 | memcpy(swsusp_header->sig,swsusp_header->orig_sig, 10); | |
568e34ed | 1590 | error = hib_submit_io(REQ_OP_WRITE | REQ_SYNC, |
162b99e3 | 1591 | swsusp_resume_block, |
62c552cc BS |
1592 | swsusp_header, NULL); |
1593 | } else { | |
64ec72a1 | 1594 | pr_err("Cannot find swsusp signature!\n"); |
62c552cc BS |
1595 | error = -ENODEV; |
1596 | } | |
1597 | ||
1598 | /* | |
1599 | * We just returned from suspend, we don't need the image any more. | |
1600 | */ | |
1601 | free_all_swap_pages(root_swap); | |
1602 | ||
1603 | return error; | |
1604 | } | |
1605 | #endif | |
1606 | ||
afd8d7c7 | 1607 | static int __init swsusp_header_init(void) |
1b29c164 VG |
1608 | { |
1609 | swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL); | |
1610 | if (!swsusp_header) | |
1611 | panic("Could not allocate memory for swsusp_header\n"); | |
1612 | return 0; | |
1613 | } | |
1614 | ||
1615 | core_initcall(swsusp_header_init); |