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; | |
e017d304 | 225 | static struct bdev_handle *hib_resume_bdev_handle; |
343df3c7 CH |
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 | ||
e017d304 JK |
279 | bio = bio_alloc(hib_resume_bdev_handle->bdev, 1, opf, |
280 | GFP_NOIO | __GFP_HIGH); | |
343df3c7 | 281 | bio->bi_iter.bi_sector = page_off * (PAGE_SIZE >> 9); |
343df3c7 CH |
282 | |
283 | if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { | |
64ec72a1 JP |
284 | pr_err("Adding page to bio failed at %llu\n", |
285 | (unsigned long long)bio->bi_iter.bi_sector); | |
343df3c7 CH |
286 | bio_put(bio); |
287 | return -EFAULT; | |
288 | } | |
289 | ||
290 | if (hb) { | |
291 | bio->bi_end_io = hib_end_io; | |
292 | bio->bi_private = hb; | |
293 | atomic_inc(&hb->count); | |
4e49ea4a | 294 | submit_bio(bio); |
343df3c7 | 295 | } else { |
4e49ea4a | 296 | error = submit_bio_wait(bio); |
343df3c7 CH |
297 | bio_put(bio); |
298 | } | |
299 | ||
300 | return error; | |
301 | } | |
302 | ||
01de5fcd | 303 | static int hib_wait_io(struct hib_bio_batch *hb) |
343df3c7 | 304 | { |
55c4478a XC |
305 | /* |
306 | * We are relying on the behavior of blk_plug that a thread with | |
307 | * a plug will flush the plug list before sleeping. | |
308 | */ | |
343df3c7 | 309 | wait_event(hb->wait, atomic_read(&hb->count) == 0); |
01de5fcd | 310 | return blk_status_to_errno(hb->error); |
343df3c7 | 311 | } |
3fc6b34f | 312 | |
3fc6b34f RW |
313 | /* |
314 | * Saving part | |
315 | */ | |
51fb352b | 316 | static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags) |
61159a31 RW |
317 | { |
318 | int error; | |
319 | ||
568e34ed | 320 | hib_submit_io(REQ_OP_READ, swsusp_resume_block, swsusp_header, NULL); |
1b29c164 VG |
321 | if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) || |
322 | !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) { | |
323 | memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10); | |
3624eb04 | 324 | memcpy(swsusp_header->sig, HIBERNATE_SIG, 10); |
51fb352b | 325 | swsusp_header->image = handle->first_sector; |
74d95555 DW |
326 | if (swsusp_hardware_signature) { |
327 | swsusp_header->hw_sig = swsusp_hardware_signature; | |
328 | flags |= SF_HW_SIG; | |
329 | } | |
a634cc10 | 330 | swsusp_header->flags = flags; |
081a9d04 BS |
331 | if (flags & SF_CRC32_MODE) |
332 | swsusp_header->crc32 = handle->crc32; | |
568e34ed | 333 | error = hib_submit_io(REQ_OP_WRITE | REQ_SYNC, |
162b99e3 | 334 | swsusp_resume_block, swsusp_header, NULL); |
61159a31 | 335 | } else { |
64ec72a1 | 336 | pr_err("Swap header not found!\n"); |
61159a31 RW |
337 | error = -ENODEV; |
338 | } | |
339 | return error; | |
340 | } | |
341 | ||
342 | /** | |
343 | * swsusp_swap_check - check if the resume device is a swap device | |
344 | * and get its index (if so) | |
6f612af5 JS |
345 | * |
346 | * This is called before saving image | |
61159a31 | 347 | */ |
6f612af5 | 348 | static int swsusp_swap_check(void) |
61159a31 | 349 | { |
3aef83e0 RW |
350 | int res; |
351 | ||
21bd9005 CH |
352 | if (swsusp_resume_device) |
353 | res = swap_type_of(swsusp_resume_device, swsusp_resume_block); | |
354 | else | |
355 | res = find_first_swap(&swsusp_resume_device); | |
3aef83e0 RW |
356 | if (res < 0) |
357 | return res; | |
3aef83e0 | 358 | root_swap = res; |
21bd9005 | 359 | |
e017d304 | 360 | hib_resume_bdev_handle = bdev_open_by_dev(swsusp_resume_device, |
05bdb996 | 361 | BLK_OPEN_WRITE, NULL, NULL); |
e017d304 JK |
362 | if (IS_ERR(hib_resume_bdev_handle)) |
363 | return PTR_ERR(hib_resume_bdev_handle); | |
3aef83e0 | 364 | |
e017d304 | 365 | res = set_blocksize(hib_resume_bdev_handle->bdev, PAGE_SIZE); |
3aef83e0 | 366 | if (res < 0) |
e017d304 | 367 | bdev_release(hib_resume_bdev_handle); |
61159a31 | 368 | |
61159a31 RW |
369 | return res; |
370 | } | |
371 | ||
372 | /** | |
373 | * write_page - Write one page to given swap location. | |
374 | * @buf: Address we're writing. | |
375 | * @offset: Offset of the swap page we're writing to. | |
343df3c7 | 376 | * @hb: bio completion batch |
61159a31 RW |
377 | */ |
378 | ||
343df3c7 | 379 | static int write_page(void *buf, sector_t offset, struct hib_bio_batch *hb) |
61159a31 | 380 | { |
3aef83e0 | 381 | void *src; |
081a9d04 | 382 | int ret; |
3aef83e0 RW |
383 | |
384 | if (!offset) | |
385 | return -ENOSPC; | |
386 | ||
343df3c7 | 387 | if (hb) { |
0eb0b63c | 388 | src = (void *)__get_free_page(GFP_NOIO | __GFP_NOWARN | |
5a21d489 | 389 | __GFP_NORETRY); |
3aef83e0 | 390 | if (src) { |
3ecb01df | 391 | copy_page(src, buf); |
3aef83e0 | 392 | } else { |
343df3c7 | 393 | ret = hib_wait_io(hb); /* Free pages */ |
081a9d04 BS |
394 | if (ret) |
395 | return ret; | |
0eb0b63c | 396 | src = (void *)__get_free_page(GFP_NOIO | |
5a21d489 BS |
397 | __GFP_NOWARN | |
398 | __GFP_NORETRY); | |
081a9d04 BS |
399 | if (src) { |
400 | copy_page(src, buf); | |
401 | } else { | |
402 | WARN_ON_ONCE(1); | |
343df3c7 | 403 | hb = NULL; /* Go synchronous */ |
081a9d04 BS |
404 | src = buf; |
405 | } | |
ab954160 | 406 | } |
3aef83e0 RW |
407 | } else { |
408 | src = buf; | |
61159a31 | 409 | } |
568e34ed | 410 | return hib_submit_io(REQ_OP_WRITE | REQ_SYNC, offset, src, hb); |
61159a31 RW |
411 | } |
412 | ||
61159a31 RW |
413 | static void release_swap_writer(struct swap_map_handle *handle) |
414 | { | |
415 | if (handle->cur) | |
416 | free_page((unsigned long)handle->cur); | |
417 | handle->cur = NULL; | |
61159a31 RW |
418 | } |
419 | ||
420 | static int get_swap_writer(struct swap_map_handle *handle) | |
421 | { | |
6f612af5 JS |
422 | int ret; |
423 | ||
424 | ret = swsusp_swap_check(); | |
425 | if (ret) { | |
426 | if (ret != -ENOSPC) | |
64ec72a1 | 427 | pr_err("Cannot find swap device, try swapon -a\n"); |
6f612af5 JS |
428 | return ret; |
429 | } | |
61159a31 | 430 | handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL); |
6f612af5 JS |
431 | if (!handle->cur) { |
432 | ret = -ENOMEM; | |
433 | goto err_close; | |
434 | } | |
d1d241cc | 435 | handle->cur_swap = alloc_swapdev_block(root_swap); |
61159a31 | 436 | if (!handle->cur_swap) { |
6f612af5 JS |
437 | ret = -ENOSPC; |
438 | goto err_rel; | |
61159a31 RW |
439 | } |
440 | handle->k = 0; | |
f8262d47 | 441 | handle->reqd_free_pages = reqd_free_pages(); |
51fb352b | 442 | handle->first_sector = handle->cur_swap; |
61159a31 | 443 | return 0; |
6f612af5 JS |
444 | err_rel: |
445 | release_swap_writer(handle); | |
446 | err_close: | |
93745df1 | 447 | swsusp_close(); |
6f612af5 | 448 | return ret; |
61159a31 RW |
449 | } |
450 | ||
ab954160 | 451 | static int swap_write_page(struct swap_map_handle *handle, void *buf, |
343df3c7 | 452 | struct hib_bio_batch *hb) |
ab954160 | 453 | { |
bbeaa469 | 454 | int error; |
3aef83e0 | 455 | sector_t offset; |
61159a31 RW |
456 | |
457 | if (!handle->cur) | |
458 | return -EINVAL; | |
d1d241cc | 459 | offset = alloc_swapdev_block(root_swap); |
343df3c7 | 460 | error = write_page(buf, offset, hb); |
61159a31 RW |
461 | if (error) |
462 | return error; | |
463 | handle->cur->entries[handle->k++] = offset; | |
464 | if (handle->k >= MAP_PAGE_ENTRIES) { | |
d1d241cc | 465 | offset = alloc_swapdev_block(root_swap); |
61159a31 RW |
466 | if (!offset) |
467 | return -ENOSPC; | |
468 | handle->cur->next_swap = offset; | |
343df3c7 | 469 | error = write_page(handle->cur, handle->cur_swap, hb); |
61159a31 | 470 | if (error) |
ab954160 | 471 | goto out; |
3ecb01df | 472 | clear_page(handle->cur); |
61159a31 RW |
473 | handle->cur_swap = offset; |
474 | handle->k = 0; | |
5a21d489 | 475 | |
343df3c7 CH |
476 | if (hb && low_free_pages() <= handle->reqd_free_pages) { |
477 | error = hib_wait_io(hb); | |
5a21d489 BS |
478 | if (error) |
479 | goto out; | |
480 | /* | |
481 | * Recalculate the number of required free pages, to | |
482 | * make sure we never take more than half. | |
483 | */ | |
484 | handle->reqd_free_pages = reqd_free_pages(); | |
485 | } | |
081a9d04 | 486 | } |
59a49335 | 487 | out: |
ab954160 | 488 | return error; |
61159a31 RW |
489 | } |
490 | ||
491 | static int flush_swap_writer(struct swap_map_handle *handle) | |
492 | { | |
493 | if (handle->cur && handle->cur_swap) | |
ab954160 | 494 | return write_page(handle->cur, handle->cur_swap, NULL); |
61159a31 RW |
495 | else |
496 | return -EINVAL; | |
497 | } | |
498 | ||
6f612af5 JS |
499 | static int swap_writer_finish(struct swap_map_handle *handle, |
500 | unsigned int flags, int error) | |
501 | { | |
502 | if (!error) { | |
64ec72a1 | 503 | pr_info("S"); |
6f612af5 | 504 | error = mark_swapfiles(handle, flags); |
64ec72a1 | 505 | pr_cont("|\n"); |
fef9c8d2 | 506 | flush_swap_writer(handle); |
6f612af5 JS |
507 | } |
508 | ||
509 | if (error) | |
510 | free_all_swap_pages(root_swap); | |
511 | release_swap_writer(handle); | |
93745df1 | 512 | swsusp_close(); |
6f612af5 JS |
513 | |
514 | return error; | |
515 | } | |
516 | ||
f996fc96 BS |
517 | /* We need to remember how much compressed data we need to read. */ |
518 | #define LZO_HEADER sizeof(size_t) | |
519 | ||
520 | /* Number of pages/bytes we'll compress at one time. */ | |
521 | #define LZO_UNC_PAGES 32 | |
522 | #define LZO_UNC_SIZE (LZO_UNC_PAGES * PAGE_SIZE) | |
523 | ||
524 | /* Number of pages/bytes we need for compressed data (worst case). */ | |
525 | #define LZO_CMP_PAGES DIV_ROUND_UP(lzo1x_worst_compress(LZO_UNC_SIZE) + \ | |
526 | LZO_HEADER, PAGE_SIZE) | |
527 | #define LZO_CMP_SIZE (LZO_CMP_PAGES * PAGE_SIZE) | |
528 | ||
081a9d04 BS |
529 | /* Maximum number of threads for compression/decompression. */ |
530 | #define LZO_THREADS 3 | |
531 | ||
5a21d489 BS |
532 | /* Minimum/maximum number of pages for read buffering. */ |
533 | #define LZO_MIN_RD_PAGES 1024 | |
534 | #define LZO_MAX_RD_PAGES 8192 | |
081a9d04 BS |
535 | |
536 | ||
61159a31 RW |
537 | /** |
538 | * save_image - save the suspend image data | |
539 | */ | |
540 | ||
541 | static int save_image(struct swap_map_handle *handle, | |
542 | struct snapshot_handle *snapshot, | |
3a4f7577 | 543 | unsigned int nr_to_write) |
61159a31 RW |
544 | { |
545 | unsigned int m; | |
546 | int ret; | |
3a4f7577 | 547 | int nr_pages; |
ab954160 | 548 | int err2; |
343df3c7 | 549 | struct hib_bio_batch hb; |
db597605 TR |
550 | ktime_t start; |
551 | ktime_t stop; | |
61159a31 | 552 | |
343df3c7 CH |
553 | hib_init_batch(&hb); |
554 | ||
64ec72a1 | 555 | pr_info("Saving image data pages (%u pages)...\n", |
23976728 | 556 | nr_to_write); |
d8150d35 | 557 | m = nr_to_write / 10; |
61159a31 RW |
558 | if (!m) |
559 | m = 1; | |
560 | nr_pages = 0; | |
db597605 | 561 | start = ktime_get(); |
4ff277f9 | 562 | while (1) { |
d3c1b24c | 563 | ret = snapshot_read_next(snapshot); |
4ff277f9 JS |
564 | if (ret <= 0) |
565 | break; | |
343df3c7 | 566 | ret = swap_write_page(handle, data_of(*snapshot), &hb); |
4ff277f9 JS |
567 | if (ret) |
568 | break; | |
569 | if (!(nr_pages % m)) | |
64ec72a1 JP |
570 | pr_info("Image saving progress: %3d%%\n", |
571 | nr_pages / m * 10); | |
4ff277f9 JS |
572 | nr_pages++; |
573 | } | |
343df3c7 | 574 | err2 = hib_wait_io(&hb); |
55c4478a | 575 | hib_finish_batch(&hb); |
db597605 | 576 | stop = ktime_get(); |
4ff277f9 JS |
577 | if (!ret) |
578 | ret = err2; | |
579 | if (!ret) | |
64ec72a1 | 580 | pr_info("Image saving done\n"); |
db597605 | 581 | swsusp_show_speed(start, stop, nr_to_write, "Wrote"); |
4ff277f9 | 582 | return ret; |
61159a31 RW |
583 | } |
584 | ||
6b37dfcb | 585 | /* |
081a9d04 BS |
586 | * Structure used for CRC32. |
587 | */ | |
588 | struct crc_data { | |
589 | struct task_struct *thr; /* thread */ | |
590 | atomic_t ready; /* ready to start flag */ | |
591 | atomic_t stop; /* ready to stop flag */ | |
592 | unsigned run_threads; /* nr current threads */ | |
593 | wait_queue_head_t go; /* start crc update */ | |
594 | wait_queue_head_t done; /* crc update done */ | |
595 | u32 *crc32; /* points to handle's crc32 */ | |
596 | size_t *unc_len[LZO_THREADS]; /* uncompressed lengths */ | |
597 | unsigned char *unc[LZO_THREADS]; /* uncompressed data */ | |
598 | }; | |
599 | ||
6b37dfcb | 600 | /* |
081a9d04 BS |
601 | * CRC32 update function that runs in its own thread. |
602 | */ | |
603 | static int crc32_threadfn(void *data) | |
604 | { | |
605 | struct crc_data *d = data; | |
606 | unsigned i; | |
607 | ||
608 | while (1) { | |
71cd7e80 | 609 | wait_event(d->go, atomic_read_acquire(&d->ready) || |
081a9d04 BS |
610 | kthread_should_stop()); |
611 | if (kthread_should_stop()) { | |
612 | d->thr = NULL; | |
71cd7e80 | 613 | atomic_set_release(&d->stop, 1); |
081a9d04 BS |
614 | wake_up(&d->done); |
615 | break; | |
616 | } | |
617 | atomic_set(&d->ready, 0); | |
618 | ||
619 | for (i = 0; i < d->run_threads; i++) | |
620 | *d->crc32 = crc32_le(*d->crc32, | |
621 | d->unc[i], *d->unc_len[i]); | |
71cd7e80 | 622 | atomic_set_release(&d->stop, 1); |
081a9d04 BS |
623 | wake_up(&d->done); |
624 | } | |
625 | return 0; | |
626 | } | |
6b37dfcb | 627 | /* |
081a9d04 BS |
628 | * Structure used for LZO data compression. |
629 | */ | |
630 | struct cmp_data { | |
631 | struct task_struct *thr; /* thread */ | |
632 | atomic_t ready; /* ready to start flag */ | |
633 | atomic_t stop; /* ready to stop flag */ | |
634 | int ret; /* return code */ | |
635 | wait_queue_head_t go; /* start compression */ | |
636 | wait_queue_head_t done; /* compression done */ | |
637 | size_t unc_len; /* uncompressed length */ | |
638 | size_t cmp_len; /* compressed length */ | |
639 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ | |
640 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ | |
641 | unsigned char wrk[LZO1X_1_MEM_COMPRESS]; /* compression workspace */ | |
642 | }; | |
643 | ||
6b37dfcb | 644 | /* |
081a9d04 BS |
645 | * Compression function that runs in its own thread. |
646 | */ | |
647 | static int lzo_compress_threadfn(void *data) | |
648 | { | |
649 | struct cmp_data *d = data; | |
650 | ||
651 | while (1) { | |
71cd7e80 | 652 | wait_event(d->go, atomic_read_acquire(&d->ready) || |
081a9d04 BS |
653 | kthread_should_stop()); |
654 | if (kthread_should_stop()) { | |
655 | d->thr = NULL; | |
656 | d->ret = -1; | |
71cd7e80 | 657 | atomic_set_release(&d->stop, 1); |
081a9d04 BS |
658 | wake_up(&d->done); |
659 | break; | |
660 | } | |
661 | atomic_set(&d->ready, 0); | |
662 | ||
663 | d->ret = lzo1x_1_compress(d->unc, d->unc_len, | |
664 | d->cmp + LZO_HEADER, &d->cmp_len, | |
665 | d->wrk); | |
71cd7e80 | 666 | atomic_set_release(&d->stop, 1); |
081a9d04 BS |
667 | wake_up(&d->done); |
668 | } | |
669 | return 0; | |
670 | } | |
f996fc96 BS |
671 | |
672 | /** | |
673 | * save_image_lzo - Save the suspend image data compressed with LZO. | |
057b0a75 | 674 | * @handle: Swap map handle to use for saving the image. |
f996fc96 BS |
675 | * @snapshot: Image to read data from. |
676 | * @nr_to_write: Number of pages to save. | |
677 | */ | |
678 | static int save_image_lzo(struct swap_map_handle *handle, | |
679 | struct snapshot_handle *snapshot, | |
680 | unsigned int nr_to_write) | |
681 | { | |
682 | unsigned int m; | |
683 | int ret = 0; | |
684 | int nr_pages; | |
685 | int err2; | |
343df3c7 | 686 | struct hib_bio_batch hb; |
db597605 TR |
687 | ktime_t start; |
688 | ktime_t stop; | |
081a9d04 BS |
689 | size_t off; |
690 | unsigned thr, run_threads, nr_threads; | |
691 | unsigned char *page = NULL; | |
692 | struct cmp_data *data = NULL; | |
693 | struct crc_data *crc = NULL; | |
694 | ||
343df3c7 CH |
695 | hib_init_batch(&hb); |
696 | ||
081a9d04 BS |
697 | /* |
698 | * We'll limit the number of threads for compression to limit memory | |
699 | * footprint. | |
700 | */ | |
701 | nr_threads = num_online_cpus() - 1; | |
702 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); | |
f996fc96 | 703 | |
0eb0b63c | 704 | page = (void *)__get_free_page(GFP_NOIO | __GFP_HIGH); |
f996fc96 | 705 | if (!page) { |
64ec72a1 | 706 | pr_err("Failed to allocate LZO page\n"); |
081a9d04 BS |
707 | ret = -ENOMEM; |
708 | goto out_clean; | |
f996fc96 BS |
709 | } |
710 | ||
9437e393 | 711 | data = vzalloc(array_size(nr_threads, sizeof(*data))); |
081a9d04 | 712 | if (!data) { |
64ec72a1 | 713 | pr_err("Failed to allocate LZO data\n"); |
081a9d04 BS |
714 | ret = -ENOMEM; |
715 | goto out_clean; | |
f996fc96 BS |
716 | } |
717 | ||
9437e393 | 718 | crc = kzalloc(sizeof(*crc), GFP_KERNEL); |
081a9d04 | 719 | if (!crc) { |
64ec72a1 | 720 | pr_err("Failed to allocate crc\n"); |
081a9d04 BS |
721 | ret = -ENOMEM; |
722 | goto out_clean; | |
723 | } | |
081a9d04 BS |
724 | |
725 | /* | |
726 | * Start the compression threads. | |
727 | */ | |
728 | for (thr = 0; thr < nr_threads; thr++) { | |
729 | init_waitqueue_head(&data[thr].go); | |
730 | init_waitqueue_head(&data[thr].done); | |
731 | ||
732 | data[thr].thr = kthread_run(lzo_compress_threadfn, | |
733 | &data[thr], | |
734 | "image_compress/%u", thr); | |
735 | if (IS_ERR(data[thr].thr)) { | |
736 | data[thr].thr = NULL; | |
64ec72a1 | 737 | pr_err("Cannot start compression threads\n"); |
081a9d04 BS |
738 | ret = -ENOMEM; |
739 | goto out_clean; | |
740 | } | |
f996fc96 BS |
741 | } |
742 | ||
081a9d04 BS |
743 | /* |
744 | * Start the CRC32 thread. | |
745 | */ | |
746 | init_waitqueue_head(&crc->go); | |
747 | init_waitqueue_head(&crc->done); | |
748 | ||
749 | handle->crc32 = 0; | |
750 | crc->crc32 = &handle->crc32; | |
751 | for (thr = 0; thr < nr_threads; thr++) { | |
752 | crc->unc[thr] = data[thr].unc; | |
753 | crc->unc_len[thr] = &data[thr].unc_len; | |
754 | } | |
755 | ||
756 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); | |
757 | if (IS_ERR(crc->thr)) { | |
758 | crc->thr = NULL; | |
64ec72a1 | 759 | pr_err("Cannot start CRC32 thread\n"); |
081a9d04 BS |
760 | ret = -ENOMEM; |
761 | goto out_clean; | |
f996fc96 BS |
762 | } |
763 | ||
5a21d489 BS |
764 | /* |
765 | * Adjust the number of required free pages after all allocations have | |
766 | * been done. We don't want to run out of pages when writing. | |
767 | */ | |
768 | handle->reqd_free_pages = reqd_free_pages(); | |
769 | ||
64ec72a1 JP |
770 | pr_info("Using %u thread(s) for compression\n", nr_threads); |
771 | pr_info("Compressing and saving image data (%u pages)...\n", | |
772 | nr_to_write); | |
d8150d35 | 773 | m = nr_to_write / 10; |
f996fc96 BS |
774 | if (!m) |
775 | m = 1; | |
776 | nr_pages = 0; | |
db597605 | 777 | start = ktime_get(); |
f996fc96 | 778 | for (;;) { |
081a9d04 BS |
779 | for (thr = 0; thr < nr_threads; thr++) { |
780 | for (off = 0; off < LZO_UNC_SIZE; off += PAGE_SIZE) { | |
781 | ret = snapshot_read_next(snapshot); | |
782 | if (ret < 0) | |
783 | goto out_finish; | |
784 | ||
785 | if (!ret) | |
786 | break; | |
787 | ||
788 | memcpy(data[thr].unc + off, | |
789 | data_of(*snapshot), PAGE_SIZE); | |
790 | ||
791 | if (!(nr_pages % m)) | |
64ec72a1 JP |
792 | pr_info("Image saving progress: %3d%%\n", |
793 | nr_pages / m * 10); | |
081a9d04 BS |
794 | nr_pages++; |
795 | } | |
796 | if (!off) | |
f996fc96 BS |
797 | break; |
798 | ||
081a9d04 | 799 | data[thr].unc_len = off; |
f996fc96 | 800 | |
71cd7e80 | 801 | atomic_set_release(&data[thr].ready, 1); |
081a9d04 | 802 | wake_up(&data[thr].go); |
f996fc96 BS |
803 | } |
804 | ||
081a9d04 | 805 | if (!thr) |
f996fc96 BS |
806 | break; |
807 | ||
081a9d04 | 808 | crc->run_threads = thr; |
71cd7e80 | 809 | atomic_set_release(&crc->ready, 1); |
081a9d04 | 810 | wake_up(&crc->go); |
f996fc96 | 811 | |
081a9d04 BS |
812 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
813 | wait_event(data[thr].done, | |
71cd7e80 | 814 | atomic_read_acquire(&data[thr].stop)); |
081a9d04 | 815 | atomic_set(&data[thr].stop, 0); |
f996fc96 | 816 | |
081a9d04 | 817 | ret = data[thr].ret; |
f996fc96 | 818 | |
081a9d04 | 819 | if (ret < 0) { |
64ec72a1 | 820 | pr_err("LZO compression failed\n"); |
081a9d04 BS |
821 | goto out_finish; |
822 | } | |
f996fc96 | 823 | |
081a9d04 BS |
824 | if (unlikely(!data[thr].cmp_len || |
825 | data[thr].cmp_len > | |
826 | lzo1x_worst_compress(data[thr].unc_len))) { | |
64ec72a1 | 827 | pr_err("Invalid LZO compressed length\n"); |
081a9d04 | 828 | ret = -1; |
f996fc96 | 829 | goto out_finish; |
081a9d04 BS |
830 | } |
831 | ||
832 | *(size_t *)data[thr].cmp = data[thr].cmp_len; | |
833 | ||
834 | /* | |
835 | * Given we are writing one page at a time to disk, we | |
836 | * copy that much from the buffer, although the last | |
837 | * bit will likely be smaller than full page. This is | |
838 | * OK - we saved the length of the compressed data, so | |
839 | * any garbage at the end will be discarded when we | |
840 | * read it. | |
841 | */ | |
842 | for (off = 0; | |
843 | off < LZO_HEADER + data[thr].cmp_len; | |
844 | off += PAGE_SIZE) { | |
845 | memcpy(page, data[thr].cmp + off, PAGE_SIZE); | |
846 | ||
343df3c7 | 847 | ret = swap_write_page(handle, page, &hb); |
081a9d04 BS |
848 | if (ret) |
849 | goto out_finish; | |
850 | } | |
f996fc96 | 851 | } |
081a9d04 | 852 | |
71cd7e80 | 853 | wait_event(crc->done, atomic_read_acquire(&crc->stop)); |
081a9d04 | 854 | atomic_set(&crc->stop, 0); |
f996fc96 BS |
855 | } |
856 | ||
857 | out_finish: | |
343df3c7 | 858 | err2 = hib_wait_io(&hb); |
db597605 | 859 | stop = ktime_get(); |
f996fc96 BS |
860 | if (!ret) |
861 | ret = err2; | |
d8150d35 | 862 | if (!ret) |
64ec72a1 | 863 | pr_info("Image saving done\n"); |
db597605 | 864 | swsusp_show_speed(start, stop, nr_to_write, "Wrote"); |
081a9d04 | 865 | out_clean: |
55c4478a | 866 | hib_finish_batch(&hb); |
081a9d04 BS |
867 | if (crc) { |
868 | if (crc->thr) | |
869 | kthread_stop(crc->thr); | |
870 | kfree(crc); | |
871 | } | |
872 | if (data) { | |
873 | for (thr = 0; thr < nr_threads; thr++) | |
874 | if (data[thr].thr) | |
875 | kthread_stop(data[thr].thr); | |
876 | vfree(data); | |
877 | } | |
878 | if (page) free_page((unsigned long)page); | |
f996fc96 BS |
879 | |
880 | return ret; | |
881 | } | |
882 | ||
61159a31 RW |
883 | /** |
884 | * enough_swap - Make sure we have enough swap to save the image. | |
885 | * | |
886 | * Returns TRUE or FALSE after checking the total amount of swap | |
e4b2897a | 887 | * space available from the resume partition. |
61159a31 RW |
888 | */ |
889 | ||
8ffdfe35 | 890 | static int enough_swap(unsigned int nr_pages) |
61159a31 RW |
891 | { |
892 | unsigned int free_swap = count_swap_pages(root_swap, 1); | |
f996fc96 | 893 | unsigned int required; |
61159a31 | 894 | |
64ec72a1 | 895 | pr_debug("Free swap pages: %u\n", free_swap); |
f996fc96 | 896 | |
ee34a370 | 897 | required = PAGES_FOR_IO + nr_pages; |
f996fc96 | 898 | return free_swap > required; |
61159a31 RW |
899 | } |
900 | ||
901 | /** | |
902 | * swsusp_write - Write entire image and metadata. | |
a634cc10 | 903 | * @flags: flags to pass to the "boot" kernel in the image header |
61159a31 RW |
904 | * |
905 | * It is important _NOT_ to umount filesystems at this point. We want | |
906 | * them synced (in case something goes wrong) but we DO not want to mark | |
907 | * filesystem clean: it is not. (And it does not matter, if we resume | |
908 | * correctly, we'll mark system clean, anyway.) | |
909 | */ | |
910 | ||
a634cc10 | 911 | int swsusp_write(unsigned int flags) |
61159a31 RW |
912 | { |
913 | struct swap_map_handle handle; | |
914 | struct snapshot_handle snapshot; | |
915 | struct swsusp_info *header; | |
6f612af5 | 916 | unsigned long pages; |
61159a31 RW |
917 | int error; |
918 | ||
6f612af5 JS |
919 | pages = snapshot_get_image_size(); |
920 | error = get_swap_writer(&handle); | |
3aef83e0 | 921 | if (error) { |
64ec72a1 | 922 | pr_err("Cannot get swap writer\n"); |
61159a31 RW |
923 | return error; |
924 | } | |
ee34a370 | 925 | if (flags & SF_NOCOMPRESS_MODE) { |
8ffdfe35 | 926 | if (!enough_swap(pages)) { |
64ec72a1 | 927 | pr_err("Not enough free swap\n"); |
ee34a370 BS |
928 | error = -ENOSPC; |
929 | goto out_finish; | |
930 | } | |
6f612af5 | 931 | } |
61159a31 | 932 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 933 | error = snapshot_read_next(&snapshot); |
d5641c64 | 934 | if (error < (int)PAGE_SIZE) { |
3aef83e0 RW |
935 | if (error >= 0) |
936 | error = -EFAULT; | |
937 | ||
6f612af5 | 938 | goto out_finish; |
3aef83e0 | 939 | } |
61159a31 | 940 | header = (struct swsusp_info *)data_of(snapshot); |
6f612af5 | 941 | error = swap_write_page(&handle, header, NULL); |
f996fc96 BS |
942 | if (!error) { |
943 | error = (flags & SF_NOCOMPRESS_MODE) ? | |
944 | save_image(&handle, &snapshot, pages - 1) : | |
945 | save_image_lzo(&handle, &snapshot, pages - 1); | |
946 | } | |
6f612af5 JS |
947 | out_finish: |
948 | error = swap_writer_finish(&handle, flags, error); | |
61159a31 RW |
949 | return error; |
950 | } | |
951 | ||
6b37dfcb | 952 | /* |
61159a31 | 953 | * The following functions allow us to read data using a swap map |
6b37dfcb | 954 | * in a file-like way. |
61159a31 RW |
955 | */ |
956 | ||
957 | static void release_swap_reader(struct swap_map_handle *handle) | |
958 | { | |
081a9d04 BS |
959 | struct swap_map_page_list *tmp; |
960 | ||
961 | while (handle->maps) { | |
962 | if (handle->maps->map) | |
963 | free_page((unsigned long)handle->maps->map); | |
964 | tmp = handle->maps; | |
965 | handle->maps = handle->maps->next; | |
966 | kfree(tmp); | |
967 | } | |
61159a31 RW |
968 | handle->cur = NULL; |
969 | } | |
970 | ||
6f612af5 JS |
971 | static int get_swap_reader(struct swap_map_handle *handle, |
972 | unsigned int *flags_p) | |
61159a31 RW |
973 | { |
974 | int error; | |
081a9d04 BS |
975 | struct swap_map_page_list *tmp, *last; |
976 | sector_t offset; | |
61159a31 | 977 | |
6f612af5 JS |
978 | *flags_p = swsusp_header->flags; |
979 | ||
980 | if (!swsusp_header->image) /* how can this happen? */ | |
61159a31 | 981 | return -EINVAL; |
3aef83e0 | 982 | |
081a9d04 BS |
983 | handle->cur = NULL; |
984 | last = handle->maps = NULL; | |
985 | offset = swsusp_header->image; | |
986 | while (offset) { | |
2f02a7ec | 987 | tmp = kzalloc(sizeof(*handle->maps), GFP_KERNEL); |
081a9d04 BS |
988 | if (!tmp) { |
989 | release_swap_reader(handle); | |
990 | return -ENOMEM; | |
991 | } | |
081a9d04 BS |
992 | if (!handle->maps) |
993 | handle->maps = tmp; | |
994 | if (last) | |
995 | last->next = tmp; | |
996 | last = tmp; | |
997 | ||
998 | tmp->map = (struct swap_map_page *) | |
0eb0b63c | 999 | __get_free_page(GFP_NOIO | __GFP_HIGH); |
081a9d04 BS |
1000 | if (!tmp->map) { |
1001 | release_swap_reader(handle); | |
1002 | return -ENOMEM; | |
1003 | } | |
3aef83e0 | 1004 | |
568e34ed | 1005 | error = hib_submit_io(REQ_OP_READ, offset, tmp->map, NULL); |
081a9d04 BS |
1006 | if (error) { |
1007 | release_swap_reader(handle); | |
1008 | return error; | |
1009 | } | |
1010 | offset = tmp->map->next_swap; | |
61159a31 RW |
1011 | } |
1012 | handle->k = 0; | |
081a9d04 | 1013 | handle->cur = handle->maps->map; |
61159a31 RW |
1014 | return 0; |
1015 | } | |
1016 | ||
546e0d27 | 1017 | static int swap_read_page(struct swap_map_handle *handle, void *buf, |
343df3c7 | 1018 | struct hib_bio_batch *hb) |
61159a31 | 1019 | { |
3aef83e0 | 1020 | sector_t offset; |
61159a31 | 1021 | int error; |
081a9d04 | 1022 | struct swap_map_page_list *tmp; |
61159a31 RW |
1023 | |
1024 | if (!handle->cur) | |
1025 | return -EINVAL; | |
1026 | offset = handle->cur->entries[handle->k]; | |
1027 | if (!offset) | |
1028 | return -EFAULT; | |
568e34ed | 1029 | error = hib_submit_io(REQ_OP_READ, offset, buf, hb); |
61159a31 RW |
1030 | if (error) |
1031 | return error; | |
1032 | if (++handle->k >= MAP_PAGE_ENTRIES) { | |
1033 | handle->k = 0; | |
081a9d04 BS |
1034 | free_page((unsigned long)handle->maps->map); |
1035 | tmp = handle->maps; | |
1036 | handle->maps = handle->maps->next; | |
1037 | kfree(tmp); | |
1038 | if (!handle->maps) | |
61159a31 | 1039 | release_swap_reader(handle); |
081a9d04 BS |
1040 | else |
1041 | handle->cur = handle->maps->map; | |
61159a31 RW |
1042 | } |
1043 | return error; | |
1044 | } | |
1045 | ||
6f612af5 JS |
1046 | static int swap_reader_finish(struct swap_map_handle *handle) |
1047 | { | |
1048 | release_swap_reader(handle); | |
1049 | ||
1050 | return 0; | |
1051 | } | |
1052 | ||
61159a31 RW |
1053 | /** |
1054 | * load_image - load the image using the swap map handle | |
1055 | * @handle and the snapshot handle @snapshot | |
1056 | * (assume there are @nr_pages pages to load) | |
1057 | */ | |
1058 | ||
1059 | static int load_image(struct swap_map_handle *handle, | |
1060 | struct snapshot_handle *snapshot, | |
546e0d27 | 1061 | unsigned int nr_to_read) |
61159a31 RW |
1062 | { |
1063 | unsigned int m; | |
081a9d04 | 1064 | int ret = 0; |
db597605 TR |
1065 | ktime_t start; |
1066 | ktime_t stop; | |
343df3c7 | 1067 | struct hib_bio_batch hb; |
546e0d27 AM |
1068 | int err2; |
1069 | unsigned nr_pages; | |
61159a31 | 1070 | |
343df3c7 CH |
1071 | hib_init_batch(&hb); |
1072 | ||
f6cf0545 | 1073 | clean_pages_on_read = true; |
64ec72a1 | 1074 | pr_info("Loading image data pages (%u pages)...\n", nr_to_read); |
d8150d35 | 1075 | m = nr_to_read / 10; |
61159a31 RW |
1076 | if (!m) |
1077 | m = 1; | |
1078 | nr_pages = 0; | |
db597605 | 1079 | start = ktime_get(); |
546e0d27 | 1080 | for ( ; ; ) { |
081a9d04 BS |
1081 | ret = snapshot_write_next(snapshot); |
1082 | if (ret <= 0) | |
546e0d27 | 1083 | break; |
343df3c7 | 1084 | ret = swap_read_page(handle, data_of(*snapshot), &hb); |
081a9d04 | 1085 | if (ret) |
546e0d27 AM |
1086 | break; |
1087 | if (snapshot->sync_read) | |
343df3c7 | 1088 | ret = hib_wait_io(&hb); |
081a9d04 | 1089 | if (ret) |
546e0d27 AM |
1090 | break; |
1091 | if (!(nr_pages % m)) | |
64ec72a1 JP |
1092 | pr_info("Image loading progress: %3d%%\n", |
1093 | nr_pages / m * 10); | |
546e0d27 AM |
1094 | nr_pages++; |
1095 | } | |
343df3c7 | 1096 | err2 = hib_wait_io(&hb); |
55c4478a | 1097 | hib_finish_batch(&hb); |
db597605 | 1098 | stop = ktime_get(); |
081a9d04 BS |
1099 | if (!ret) |
1100 | ret = err2; | |
1101 | if (!ret) { | |
64ec72a1 | 1102 | pr_info("Image loading done\n"); |
8357376d | 1103 | snapshot_write_finalize(snapshot); |
e655a250 | 1104 | if (!snapshot_image_loaded(snapshot)) |
081a9d04 | 1105 | ret = -ENODATA; |
d8150d35 | 1106 | } |
db597605 | 1107 | swsusp_show_speed(start, stop, nr_to_read, "Read"); |
081a9d04 BS |
1108 | return ret; |
1109 | } | |
1110 | ||
6b37dfcb | 1111 | /* |
081a9d04 BS |
1112 | * Structure used for LZO data decompression. |
1113 | */ | |
1114 | struct dec_data { | |
1115 | struct task_struct *thr; /* thread */ | |
1116 | atomic_t ready; /* ready to start flag */ | |
1117 | atomic_t stop; /* ready to stop flag */ | |
1118 | int ret; /* return code */ | |
1119 | wait_queue_head_t go; /* start decompression */ | |
1120 | wait_queue_head_t done; /* decompression done */ | |
1121 | size_t unc_len; /* uncompressed length */ | |
1122 | size_t cmp_len; /* compressed length */ | |
1123 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ | |
1124 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ | |
1125 | }; | |
1126 | ||
6b37dfcb | 1127 | /* |
6be2408a | 1128 | * Decompression function that runs in its own thread. |
081a9d04 BS |
1129 | */ |
1130 | static int lzo_decompress_threadfn(void *data) | |
1131 | { | |
1132 | struct dec_data *d = data; | |
1133 | ||
1134 | while (1) { | |
71cd7e80 | 1135 | wait_event(d->go, atomic_read_acquire(&d->ready) || |
081a9d04 BS |
1136 | kthread_should_stop()); |
1137 | if (kthread_should_stop()) { | |
1138 | d->thr = NULL; | |
1139 | d->ret = -1; | |
71cd7e80 | 1140 | atomic_set_release(&d->stop, 1); |
081a9d04 BS |
1141 | wake_up(&d->done); |
1142 | break; | |
1143 | } | |
1144 | atomic_set(&d->ready, 0); | |
1145 | ||
1146 | d->unc_len = LZO_UNC_SIZE; | |
1147 | d->ret = lzo1x_decompress_safe(d->cmp + LZO_HEADER, d->cmp_len, | |
1148 | d->unc, &d->unc_len); | |
f6cf0545 JM |
1149 | if (clean_pages_on_decompress) |
1150 | flush_icache_range((unsigned long)d->unc, | |
1151 | (unsigned long)d->unc + d->unc_len); | |
1152 | ||
71cd7e80 | 1153 | atomic_set_release(&d->stop, 1); |
081a9d04 BS |
1154 | wake_up(&d->done); |
1155 | } | |
1156 | return 0; | |
61159a31 RW |
1157 | } |
1158 | ||
f996fc96 BS |
1159 | /** |
1160 | * load_image_lzo - Load compressed image data and decompress them with LZO. | |
1161 | * @handle: Swap map handle to use for loading data. | |
1162 | * @snapshot: Image to copy uncompressed data into. | |
1163 | * @nr_to_read: Number of pages to load. | |
1164 | */ | |
1165 | static int load_image_lzo(struct swap_map_handle *handle, | |
1166 | struct snapshot_handle *snapshot, | |
1167 | unsigned int nr_to_read) | |
1168 | { | |
1169 | unsigned int m; | |
081a9d04 BS |
1170 | int ret = 0; |
1171 | int eof = 0; | |
343df3c7 | 1172 | struct hib_bio_batch hb; |
db597605 TR |
1173 | ktime_t start; |
1174 | ktime_t stop; | |
f996fc96 | 1175 | unsigned nr_pages; |
081a9d04 BS |
1176 | size_t off; |
1177 | unsigned i, thr, run_threads, nr_threads; | |
1178 | unsigned ring = 0, pg = 0, ring_size = 0, | |
1179 | have = 0, want, need, asked = 0; | |
5a21d489 | 1180 | unsigned long read_pages = 0; |
081a9d04 BS |
1181 | unsigned char **page = NULL; |
1182 | struct dec_data *data = NULL; | |
1183 | struct crc_data *crc = NULL; | |
1184 | ||
343df3c7 CH |
1185 | hib_init_batch(&hb); |
1186 | ||
081a9d04 BS |
1187 | /* |
1188 | * We'll limit the number of threads for decompression to limit memory | |
1189 | * footprint. | |
1190 | */ | |
1191 | nr_threads = num_online_cpus() - 1; | |
1192 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); | |
1193 | ||
42bc47b3 | 1194 | page = vmalloc(array_size(LZO_MAX_RD_PAGES, sizeof(*page))); |
081a9d04 | 1195 | if (!page) { |
64ec72a1 | 1196 | pr_err("Failed to allocate LZO page\n"); |
081a9d04 BS |
1197 | ret = -ENOMEM; |
1198 | goto out_clean; | |
1199 | } | |
9f339caf | 1200 | |
9437e393 | 1201 | data = vzalloc(array_size(nr_threads, sizeof(*data))); |
081a9d04 | 1202 | if (!data) { |
64ec72a1 | 1203 | pr_err("Failed to allocate LZO data\n"); |
081a9d04 BS |
1204 | ret = -ENOMEM; |
1205 | goto out_clean; | |
1206 | } | |
9f339caf | 1207 | |
9437e393 | 1208 | crc = kzalloc(sizeof(*crc), GFP_KERNEL); |
081a9d04 | 1209 | if (!crc) { |
64ec72a1 | 1210 | pr_err("Failed to allocate crc\n"); |
081a9d04 BS |
1211 | ret = -ENOMEM; |
1212 | goto out_clean; | |
1213 | } | |
081a9d04 | 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; | |
64ec72a1 | 1229 | pr_err("Cannot start decompression threads\n"); |
081a9d04 BS |
1230 | ret = -ENOMEM; |
1231 | goto out_clean; | |
9f339caf | 1232 | } |
f996fc96 BS |
1233 | } |
1234 | ||
081a9d04 BS |
1235 | /* |
1236 | * Start the CRC32 thread. | |
1237 | */ | |
1238 | init_waitqueue_head(&crc->go); | |
1239 | init_waitqueue_head(&crc->done); | |
1240 | ||
1241 | handle->crc32 = 0; | |
1242 | crc->crc32 = &handle->crc32; | |
1243 | for (thr = 0; thr < nr_threads; thr++) { | |
1244 | crc->unc[thr] = data[thr].unc; | |
1245 | crc->unc_len[thr] = &data[thr].unc_len; | |
f996fc96 BS |
1246 | } |
1247 | ||
081a9d04 BS |
1248 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); |
1249 | if (IS_ERR(crc->thr)) { | |
1250 | crc->thr = NULL; | |
64ec72a1 | 1251 | pr_err("Cannot start CRC32 thread\n"); |
081a9d04 BS |
1252 | ret = -ENOMEM; |
1253 | goto out_clean; | |
1254 | } | |
9f339caf | 1255 | |
081a9d04 | 1256 | /* |
5a21d489 BS |
1257 | * Set the number of pages for read buffering. |
1258 | * This is complete guesswork, because we'll only know the real | |
1259 | * picture once prepare_image() is called, which is much later on | |
1260 | * during the image load phase. We'll assume the worst case and | |
1261 | * say that none of the image pages are from high memory. | |
081a9d04 | 1262 | */ |
5a21d489 BS |
1263 | if (low_free_pages() > snapshot_get_image_size()) |
1264 | read_pages = (low_free_pages() - snapshot_get_image_size()) / 2; | |
1265 | read_pages = clamp_val(read_pages, LZO_MIN_RD_PAGES, LZO_MAX_RD_PAGES); | |
9f339caf | 1266 | |
081a9d04 BS |
1267 | for (i = 0; i < read_pages; i++) { |
1268 | page[i] = (void *)__get_free_page(i < LZO_CMP_PAGES ? | |
0eb0b63c CH |
1269 | GFP_NOIO | __GFP_HIGH : |
1270 | GFP_NOIO | __GFP_NOWARN | | |
71baba4b | 1271 | __GFP_NORETRY); |
5a21d489 | 1272 | |
081a9d04 BS |
1273 | if (!page[i]) { |
1274 | if (i < LZO_CMP_PAGES) { | |
1275 | ring_size = i; | |
64ec72a1 | 1276 | pr_err("Failed to allocate LZO pages\n"); |
081a9d04 BS |
1277 | ret = -ENOMEM; |
1278 | goto out_clean; | |
1279 | } else { | |
1280 | break; | |
1281 | } | |
1282 | } | |
f996fc96 | 1283 | } |
081a9d04 | 1284 | want = ring_size = i; |
f996fc96 | 1285 | |
64ec72a1 JP |
1286 | pr_info("Using %u thread(s) for decompression\n", nr_threads); |
1287 | pr_info("Loading and decompressing image data (%u pages)...\n", | |
1288 | nr_to_read); | |
d8150d35 | 1289 | m = nr_to_read / 10; |
f996fc96 BS |
1290 | if (!m) |
1291 | m = 1; | |
1292 | nr_pages = 0; | |
db597605 | 1293 | start = ktime_get(); |
f996fc96 | 1294 | |
081a9d04 BS |
1295 | ret = snapshot_write_next(snapshot); |
1296 | if (ret <= 0) | |
f996fc96 BS |
1297 | goto out_finish; |
1298 | ||
081a9d04 BS |
1299 | for(;;) { |
1300 | for (i = 0; !eof && i < want; i++) { | |
343df3c7 | 1301 | ret = swap_read_page(handle, page[ring], &hb); |
081a9d04 BS |
1302 | if (ret) { |
1303 | /* | |
1304 | * On real read error, finish. On end of data, | |
1305 | * set EOF flag and just exit the read loop. | |
1306 | */ | |
1307 | if (handle->cur && | |
1308 | handle->cur->entries[handle->k]) { | |
1309 | goto out_finish; | |
1310 | } else { | |
1311 | eof = 1; | |
1312 | break; | |
1313 | } | |
1314 | } | |
1315 | if (++ring >= ring_size) | |
1316 | ring = 0; | |
f996fc96 | 1317 | } |
081a9d04 BS |
1318 | asked += i; |
1319 | want -= i; | |
f996fc96 | 1320 | |
081a9d04 BS |
1321 | /* |
1322 | * We are out of data, wait for some more. | |
1323 | */ | |
1324 | if (!have) { | |
1325 | if (!asked) | |
1326 | break; | |
1327 | ||
343df3c7 | 1328 | ret = hib_wait_io(&hb); |
081a9d04 | 1329 | if (ret) |
f996fc96 | 1330 | goto out_finish; |
081a9d04 BS |
1331 | have += asked; |
1332 | asked = 0; | |
1333 | if (eof) | |
1334 | eof = 2; | |
9f339caf | 1335 | } |
f996fc96 | 1336 | |
081a9d04 | 1337 | if (crc->run_threads) { |
71cd7e80 | 1338 | wait_event(crc->done, atomic_read_acquire(&crc->stop)); |
081a9d04 BS |
1339 | atomic_set(&crc->stop, 0); |
1340 | crc->run_threads = 0; | |
f996fc96 BS |
1341 | } |
1342 | ||
081a9d04 BS |
1343 | for (thr = 0; have && thr < nr_threads; thr++) { |
1344 | data[thr].cmp_len = *(size_t *)page[pg]; | |
1345 | if (unlikely(!data[thr].cmp_len || | |
1346 | data[thr].cmp_len > | |
1347 | lzo1x_worst_compress(LZO_UNC_SIZE))) { | |
64ec72a1 | 1348 | pr_err("Invalid LZO compressed length\n"); |
081a9d04 BS |
1349 | ret = -1; |
1350 | goto out_finish; | |
1351 | } | |
1352 | ||
1353 | need = DIV_ROUND_UP(data[thr].cmp_len + LZO_HEADER, | |
1354 | PAGE_SIZE); | |
1355 | if (need > have) { | |
1356 | if (eof > 1) { | |
1357 | ret = -1; | |
1358 | goto out_finish; | |
1359 | } | |
1360 | break; | |
1361 | } | |
1362 | ||
1363 | for (off = 0; | |
1364 | off < LZO_HEADER + data[thr].cmp_len; | |
1365 | off += PAGE_SIZE) { | |
1366 | memcpy(data[thr].cmp + off, | |
1367 | page[pg], PAGE_SIZE); | |
1368 | have--; | |
1369 | want++; | |
1370 | if (++pg >= ring_size) | |
1371 | pg = 0; | |
1372 | } | |
1373 | ||
71cd7e80 | 1374 | atomic_set_release(&data[thr].ready, 1); |
081a9d04 | 1375 | wake_up(&data[thr].go); |
f996fc96 BS |
1376 | } |
1377 | ||
081a9d04 BS |
1378 | /* |
1379 | * Wait for more data while we are decompressing. | |
1380 | */ | |
1381 | if (have < LZO_CMP_PAGES && asked) { | |
343df3c7 | 1382 | ret = hib_wait_io(&hb); |
081a9d04 BS |
1383 | if (ret) |
1384 | goto out_finish; | |
1385 | have += asked; | |
1386 | asked = 0; | |
1387 | if (eof) | |
1388 | eof = 2; | |
f996fc96 BS |
1389 | } |
1390 | ||
081a9d04 BS |
1391 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
1392 | wait_event(data[thr].done, | |
71cd7e80 | 1393 | atomic_read_acquire(&data[thr].stop)); |
081a9d04 BS |
1394 | atomic_set(&data[thr].stop, 0); |
1395 | ||
1396 | ret = data[thr].ret; | |
f996fc96 | 1397 | |
081a9d04 | 1398 | if (ret < 0) { |
64ec72a1 | 1399 | pr_err("LZO decompression failed\n"); |
081a9d04 BS |
1400 | goto out_finish; |
1401 | } | |
f996fc96 | 1402 | |
081a9d04 BS |
1403 | if (unlikely(!data[thr].unc_len || |
1404 | data[thr].unc_len > LZO_UNC_SIZE || | |
1405 | data[thr].unc_len & (PAGE_SIZE - 1))) { | |
64ec72a1 | 1406 | pr_err("Invalid LZO uncompressed length\n"); |
081a9d04 | 1407 | ret = -1; |
f996fc96 | 1408 | goto out_finish; |
081a9d04 BS |
1409 | } |
1410 | ||
1411 | for (off = 0; | |
1412 | off < data[thr].unc_len; off += PAGE_SIZE) { | |
1413 | memcpy(data_of(*snapshot), | |
1414 | data[thr].unc + off, PAGE_SIZE); | |
1415 | ||
1416 | if (!(nr_pages % m)) | |
64ec72a1 JP |
1417 | pr_info("Image loading progress: %3d%%\n", |
1418 | nr_pages / m * 10); | |
081a9d04 BS |
1419 | nr_pages++; |
1420 | ||
1421 | ret = snapshot_write_next(snapshot); | |
1422 | if (ret <= 0) { | |
1423 | crc->run_threads = thr + 1; | |
71cd7e80 | 1424 | atomic_set_release(&crc->ready, 1); |
081a9d04 BS |
1425 | wake_up(&crc->go); |
1426 | goto out_finish; | |
1427 | } | |
1428 | } | |
f996fc96 | 1429 | } |
081a9d04 BS |
1430 | |
1431 | crc->run_threads = thr; | |
71cd7e80 | 1432 | atomic_set_release(&crc->ready, 1); |
081a9d04 | 1433 | wake_up(&crc->go); |
f996fc96 BS |
1434 | } |
1435 | ||
1436 | out_finish: | |
081a9d04 | 1437 | if (crc->run_threads) { |
71cd7e80 | 1438 | wait_event(crc->done, atomic_read_acquire(&crc->stop)); |
081a9d04 BS |
1439 | atomic_set(&crc->stop, 0); |
1440 | } | |
db597605 | 1441 | stop = ktime_get(); |
081a9d04 | 1442 | if (!ret) { |
64ec72a1 | 1443 | pr_info("Image loading done\n"); |
f996fc96 BS |
1444 | snapshot_write_finalize(snapshot); |
1445 | if (!snapshot_image_loaded(snapshot)) | |
081a9d04 BS |
1446 | ret = -ENODATA; |
1447 | if (!ret) { | |
1448 | if (swsusp_header->flags & SF_CRC32_MODE) { | |
1449 | if(handle->crc32 != swsusp_header->crc32) { | |
64ec72a1 | 1450 | pr_err("Invalid image CRC32!\n"); |
081a9d04 BS |
1451 | ret = -ENODATA; |
1452 | } | |
1453 | } | |
1454 | } | |
d8150d35 | 1455 | } |
db597605 | 1456 | swsusp_show_speed(start, stop, nr_to_read, "Read"); |
081a9d04 | 1457 | out_clean: |
55c4478a | 1458 | hib_finish_batch(&hb); |
081a9d04 | 1459 | for (i = 0; i < ring_size; i++) |
9f339caf | 1460 | free_page((unsigned long)page[i]); |
081a9d04 BS |
1461 | if (crc) { |
1462 | if (crc->thr) | |
1463 | kthread_stop(crc->thr); | |
1464 | kfree(crc); | |
1465 | } | |
1466 | if (data) { | |
1467 | for (thr = 0; thr < nr_threads; thr++) | |
1468 | if (data[thr].thr) | |
1469 | kthread_stop(data[thr].thr); | |
1470 | vfree(data); | |
1471 | } | |
6c45de0d | 1472 | vfree(page); |
f996fc96 | 1473 | |
081a9d04 | 1474 | return ret; |
f996fc96 BS |
1475 | } |
1476 | ||
a634cc10 RW |
1477 | /** |
1478 | * swsusp_read - read the hibernation image. | |
1479 | * @flags_p: flags passed by the "frozen" kernel in the image header should | |
b595076a | 1480 | * be written into this memory location |
a634cc10 RW |
1481 | */ |
1482 | ||
1483 | int swsusp_read(unsigned int *flags_p) | |
61159a31 RW |
1484 | { |
1485 | int error; | |
1486 | struct swap_map_handle handle; | |
1487 | struct snapshot_handle snapshot; | |
1488 | struct swsusp_info *header; | |
1489 | ||
61159a31 | 1490 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 1491 | error = snapshot_write_next(&snapshot); |
d5641c64 | 1492 | if (error < (int)PAGE_SIZE) |
61159a31 RW |
1493 | return error < 0 ? error : -EFAULT; |
1494 | header = (struct swsusp_info *)data_of(snapshot); | |
6f612af5 JS |
1495 | error = get_swap_reader(&handle, flags_p); |
1496 | if (error) | |
1497 | goto end; | |
61159a31 | 1498 | if (!error) |
546e0d27 | 1499 | error = swap_read_page(&handle, header, NULL); |
f996fc96 BS |
1500 | if (!error) { |
1501 | error = (*flags_p & SF_NOCOMPRESS_MODE) ? | |
1502 | load_image(&handle, &snapshot, header->pages - 1) : | |
1503 | load_image_lzo(&handle, &snapshot, header->pages - 1); | |
1504 | } | |
6f612af5 JS |
1505 | swap_reader_finish(&handle); |
1506 | end: | |
61159a31 | 1507 | if (!error) |
64ec72a1 | 1508 | pr_debug("Image successfully loaded\n"); |
61159a31 | 1509 | else |
64ec72a1 | 1510 | pr_debug("Error %d resuming\n", error); |
61159a31 RW |
1511 | return error; |
1512 | } | |
1513 | ||
c889d079 CH |
1514 | static void *swsusp_holder; |
1515 | ||
61159a31 | 1516 | /** |
7bf770f7 | 1517 | * swsusp_check - Open the resume device and check for the swsusp signature. |
40d84e19 | 1518 | * @exclusive: Open the resume device exclusively. |
61159a31 RW |
1519 | */ |
1520 | ||
40d84e19 | 1521 | int swsusp_check(bool exclusive) |
61159a31 | 1522 | { |
40d84e19 | 1523 | void *holder = exclusive ? &swsusp_holder : NULL; |
61159a31 | 1524 | int error; |
5904de0d | 1525 | |
e017d304 JK |
1526 | hib_resume_bdev_handle = bdev_open_by_dev(swsusp_resume_device, |
1527 | BLK_OPEN_READ, holder, NULL); | |
1528 | if (!IS_ERR(hib_resume_bdev_handle)) { | |
1529 | set_blocksize(hib_resume_bdev_handle->bdev, PAGE_SIZE); | |
3ecb01df | 1530 | clear_page(swsusp_header); |
568e34ed | 1531 | error = hib_submit_io(REQ_OP_READ, swsusp_resume_block, |
1b29c164 | 1532 | swsusp_header, NULL); |
9a154d9d | 1533 | if (error) |
76b57e61 | 1534 | goto put; |
9a154d9d | 1535 | |
3624eb04 | 1536 | if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) { |
1b29c164 | 1537 | memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10); |
61159a31 | 1538 | /* Reset swap signature now */ |
568e34ed | 1539 | error = hib_submit_io(REQ_OP_WRITE | REQ_SYNC, |
162b99e3 | 1540 | swsusp_resume_block, |
1b29c164 | 1541 | swsusp_header, NULL); |
61159a31 | 1542 | } else { |
76b57e61 | 1543 | error = -EINVAL; |
61159a31 | 1544 | } |
74d95555 DW |
1545 | if (!error && swsusp_header->flags & SF_HW_SIG && |
1546 | swsusp_header->hw_sig != swsusp_hardware_signature) { | |
1547 | pr_info("Suspend image hardware signature mismatch (%08x now %08x); aborting resume.\n", | |
1548 | swsusp_header->hw_sig, swsusp_hardware_signature); | |
1549 | error = -EINVAL; | |
1550 | } | |
76b57e61 JS |
1551 | |
1552 | put: | |
61159a31 | 1553 | if (error) |
e017d304 | 1554 | bdev_release(hib_resume_bdev_handle); |
61159a31 | 1555 | else |
64ec72a1 | 1556 | pr_debug("Image signature found, resuming\n"); |
61159a31 | 1557 | } else { |
e017d304 | 1558 | error = PTR_ERR(hib_resume_bdev_handle); |
61159a31 RW |
1559 | } |
1560 | ||
1561 | if (error) | |
64ec72a1 | 1562 | pr_debug("Image not found (code %d)\n", error); |
61159a31 RW |
1563 | |
1564 | return error; | |
1565 | } | |
1566 | ||
1567 | /** | |
7bf770f7 | 1568 | * swsusp_close - close resume device. |
61159a31 RW |
1569 | */ |
1570 | ||
93745df1 | 1571 | void swsusp_close(void) |
61159a31 | 1572 | { |
e017d304 | 1573 | if (IS_ERR(hib_resume_bdev_handle)) { |
64ec72a1 | 1574 | pr_debug("Image device not initialised\n"); |
61159a31 RW |
1575 | return; |
1576 | } | |
1577 | ||
e017d304 | 1578 | bdev_release(hib_resume_bdev_handle); |
61159a31 | 1579 | } |
1b29c164 | 1580 | |
62c552cc BS |
1581 | /** |
1582 | * swsusp_unmark - Unmark swsusp signature in the resume device | |
1583 | */ | |
1584 | ||
1585 | #ifdef CONFIG_SUSPEND | |
1586 | int swsusp_unmark(void) | |
1587 | { | |
1588 | int error; | |
1589 | ||
568e34ed BVA |
1590 | hib_submit_io(REQ_OP_READ, swsusp_resume_block, |
1591 | swsusp_header, NULL); | |
62c552cc BS |
1592 | if (!memcmp(HIBERNATE_SIG,swsusp_header->sig, 10)) { |
1593 | memcpy(swsusp_header->sig,swsusp_header->orig_sig, 10); | |
568e34ed | 1594 | error = hib_submit_io(REQ_OP_WRITE | REQ_SYNC, |
162b99e3 | 1595 | swsusp_resume_block, |
62c552cc BS |
1596 | swsusp_header, NULL); |
1597 | } else { | |
64ec72a1 | 1598 | pr_err("Cannot find swsusp signature!\n"); |
62c552cc BS |
1599 | error = -ENODEV; |
1600 | } | |
1601 | ||
1602 | /* | |
1603 | * We just returned from suspend, we don't need the image any more. | |
1604 | */ | |
1605 | free_all_swap_pages(root_swap); | |
1606 | ||
1607 | return error; | |
1608 | } | |
1609 | #endif | |
1610 | ||
afd8d7c7 | 1611 | static int __init swsusp_header_init(void) |
1b29c164 VG |
1612 | { |
1613 | swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL); | |
1614 | if (!swsusp_header) | |
1615 | panic("Could not allocate memory for swsusp_header\n"); | |
1616 | return 0; | |
1617 | } | |
1618 | ||
1619 | core_initcall(swsusp_header_init); |