Commit | Line | Data |
---|---|---|
61159a31 RW |
1 | /* |
2 | * linux/kernel/power/swap.c | |
3 | * | |
4 | * This file provides functions for reading the suspend image from | |
5 | * and writing it to a swap partition. | |
6 | * | |
a2531293 | 7 | * Copyright (C) 1998,2001-2005 Pavel Machek <pavel@ucw.cz> |
61159a31 | 8 | * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl> |
9f339caf | 9 | * Copyright (C) 2010 Bojan Smojver <bojan@rexursive.com> |
61159a31 RW |
10 | * |
11 | * This file is released under the GPLv2. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/module.h> | |
61159a31 | 16 | #include <linux/file.h> |
61159a31 RW |
17 | #include <linux/delay.h> |
18 | #include <linux/bitops.h> | |
19 | #include <linux/genhd.h> | |
20 | #include <linux/device.h> | |
61159a31 | 21 | #include <linux/bio.h> |
546e0d27 | 22 | #include <linux/blkdev.h> |
61159a31 RW |
23 | #include <linux/swap.h> |
24 | #include <linux/swapops.h> | |
25 | #include <linux/pm.h> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
f996fc96 BS |
27 | #include <linux/lzo.h> |
28 | #include <linux/vmalloc.h> | |
081a9d04 BS |
29 | #include <linux/cpumask.h> |
30 | #include <linux/atomic.h> | |
31 | #include <linux/kthread.h> | |
32 | #include <linux/crc32.h> | |
61159a31 RW |
33 | |
34 | #include "power.h" | |
35 | ||
be8cd644 | 36 | #define HIBERNATE_SIG "S1SUSPEND" |
61159a31 | 37 | |
51fb352b JS |
38 | /* |
39 | * The swap map is a data structure used for keeping track of each page | |
40 | * written to a swap partition. It consists of many swap_map_page | |
90133673 | 41 | * structures that contain each an array of MAP_PAGE_ENTRIES swap entries. |
51fb352b JS |
42 | * These structures are stored on the swap and linked together with the |
43 | * help of the .next_swap member. | |
44 | * | |
45 | * The swap map is created during suspend. The swap map pages are | |
46 | * allocated and populated one at a time, so we only need one memory | |
47 | * page to set up the entire structure. | |
48 | * | |
081a9d04 | 49 | * During resume we pick up all swap_map_page structures into a list. |
51fb352b JS |
50 | */ |
51 | ||
52 | #define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1) | |
53 | ||
f8262d47 BS |
54 | /* |
55 | * Number of free pages that are not high. | |
56 | */ | |
57 | static inline unsigned long low_free_pages(void) | |
58 | { | |
59 | return nr_free_pages() - nr_free_highpages(); | |
60 | } | |
61 | ||
62 | /* | |
63 | * Number of pages required to be kept free while writing the image. Always | |
64 | * half of all available low pages before the writing starts. | |
65 | */ | |
66 | static inline unsigned long reqd_free_pages(void) | |
67 | { | |
68 | return low_free_pages() / 2; | |
69 | } | |
70 | ||
51fb352b JS |
71 | struct swap_map_page { |
72 | sector_t entries[MAP_PAGE_ENTRIES]; | |
73 | sector_t next_swap; | |
74 | }; | |
75 | ||
081a9d04 BS |
76 | struct swap_map_page_list { |
77 | struct swap_map_page *map; | |
78 | struct swap_map_page_list *next; | |
79 | }; | |
80 | ||
51fb352b JS |
81 | /** |
82 | * The swap_map_handle structure is used for handling swap in | |
83 | * a file-alike way | |
84 | */ | |
85 | ||
86 | struct swap_map_handle { | |
87 | struct swap_map_page *cur; | |
081a9d04 | 88 | struct swap_map_page_list *maps; |
51fb352b JS |
89 | sector_t cur_swap; |
90 | sector_t first_sector; | |
91 | unsigned int k; | |
f8262d47 | 92 | unsigned long reqd_free_pages; |
081a9d04 | 93 | u32 crc32; |
51fb352b JS |
94 | }; |
95 | ||
1b29c164 | 96 | struct swsusp_header { |
081a9d04 BS |
97 | char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int) - |
98 | sizeof(u32)]; | |
99 | u32 crc32; | |
3aef83e0 | 100 | sector_t image; |
a634cc10 | 101 | unsigned int flags; /* Flags to pass to the "boot" kernel */ |
61159a31 RW |
102 | char orig_sig[10]; |
103 | char sig[10]; | |
1b29c164 VG |
104 | } __attribute__((packed)); |
105 | ||
106 | static struct swsusp_header *swsusp_header; | |
61159a31 | 107 | |
0414f2ec NC |
108 | /** |
109 | * The following functions are used for tracing the allocated | |
110 | * swap pages, so that they can be freed in case of an error. | |
111 | */ | |
112 | ||
113 | struct swsusp_extent { | |
114 | struct rb_node node; | |
115 | unsigned long start; | |
116 | unsigned long end; | |
117 | }; | |
118 | ||
119 | static struct rb_root swsusp_extents = RB_ROOT; | |
120 | ||
121 | static int swsusp_extents_insert(unsigned long swap_offset) | |
122 | { | |
123 | struct rb_node **new = &(swsusp_extents.rb_node); | |
124 | struct rb_node *parent = NULL; | |
125 | struct swsusp_extent *ext; | |
126 | ||
127 | /* Figure out where to put the new node */ | |
128 | while (*new) { | |
129 | ext = container_of(*new, struct swsusp_extent, node); | |
130 | parent = *new; | |
131 | if (swap_offset < ext->start) { | |
132 | /* Try to merge */ | |
133 | if (swap_offset == ext->start - 1) { | |
134 | ext->start--; | |
135 | return 0; | |
136 | } | |
137 | new = &((*new)->rb_left); | |
138 | } else if (swap_offset > ext->end) { | |
139 | /* Try to merge */ | |
140 | if (swap_offset == ext->end + 1) { | |
141 | ext->end++; | |
142 | return 0; | |
143 | } | |
144 | new = &((*new)->rb_right); | |
145 | } else { | |
146 | /* It already is in the tree */ | |
147 | return -EINVAL; | |
148 | } | |
149 | } | |
150 | /* Add the new node and rebalance the tree. */ | |
151 | ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL); | |
152 | if (!ext) | |
153 | return -ENOMEM; | |
154 | ||
155 | ext->start = swap_offset; | |
156 | ext->end = swap_offset; | |
157 | rb_link_node(&ext->node, parent, new); | |
158 | rb_insert_color(&ext->node, &swsusp_extents); | |
159 | return 0; | |
160 | } | |
161 | ||
162 | /** | |
163 | * alloc_swapdev_block - allocate a swap page and register that it has | |
164 | * been allocated, so that it can be freed in case of an error. | |
165 | */ | |
166 | ||
167 | sector_t alloc_swapdev_block(int swap) | |
168 | { | |
169 | unsigned long offset; | |
170 | ||
910321ea | 171 | offset = swp_offset(get_swap_page_of_type(swap)); |
0414f2ec NC |
172 | if (offset) { |
173 | if (swsusp_extents_insert(offset)) | |
910321ea | 174 | swap_free(swp_entry(swap, offset)); |
0414f2ec NC |
175 | else |
176 | return swapdev_block(swap, offset); | |
177 | } | |
178 | return 0; | |
179 | } | |
180 | ||
181 | /** | |
182 | * free_all_swap_pages - free swap pages allocated for saving image data. | |
90133673 | 183 | * It also frees the extents used to register which swap entries had been |
0414f2ec NC |
184 | * allocated. |
185 | */ | |
186 | ||
187 | void free_all_swap_pages(int swap) | |
188 | { | |
189 | struct rb_node *node; | |
190 | ||
191 | while ((node = swsusp_extents.rb_node)) { | |
192 | struct swsusp_extent *ext; | |
193 | unsigned long offset; | |
194 | ||
195 | ext = container_of(node, struct swsusp_extent, node); | |
196 | rb_erase(node, &swsusp_extents); | |
197 | for (offset = ext->start; offset <= ext->end; offset++) | |
910321ea | 198 | swap_free(swp_entry(swap, offset)); |
0414f2ec NC |
199 | |
200 | kfree(ext); | |
201 | } | |
202 | } | |
203 | ||
204 | int swsusp_swap_in_use(void) | |
205 | { | |
206 | return (swsusp_extents.rb_node != NULL); | |
207 | } | |
208 | ||
61159a31 | 209 | /* |
3fc6b34f | 210 | * General things |
61159a31 RW |
211 | */ |
212 | ||
213 | static unsigned short root_swap = 0xffff; | |
8a0d613f | 214 | struct block_device *hib_resume_bdev; |
3fc6b34f | 215 | |
3fc6b34f RW |
216 | /* |
217 | * Saving part | |
218 | */ | |
61159a31 | 219 | |
51fb352b | 220 | static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags) |
61159a31 RW |
221 | { |
222 | int error; | |
223 | ||
8a0d613f | 224 | hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL); |
1b29c164 VG |
225 | if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) || |
226 | !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) { | |
227 | memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10); | |
3624eb04 | 228 | memcpy(swsusp_header->sig, HIBERNATE_SIG, 10); |
51fb352b | 229 | swsusp_header->image = handle->first_sector; |
a634cc10 | 230 | swsusp_header->flags = flags; |
081a9d04 BS |
231 | if (flags & SF_CRC32_MODE) |
232 | swsusp_header->crc32 = handle->crc32; | |
8a0d613f | 233 | error = hib_bio_write_page(swsusp_resume_block, |
1b29c164 | 234 | swsusp_header, NULL); |
61159a31 | 235 | } else { |
23976728 | 236 | printk(KERN_ERR "PM: Swap header not found!\n"); |
61159a31 RW |
237 | error = -ENODEV; |
238 | } | |
239 | return error; | |
240 | } | |
241 | ||
242 | /** | |
243 | * swsusp_swap_check - check if the resume device is a swap device | |
244 | * and get its index (if so) | |
6f612af5 JS |
245 | * |
246 | * This is called before saving image | |
61159a31 | 247 | */ |
6f612af5 | 248 | static int swsusp_swap_check(void) |
61159a31 | 249 | { |
3aef83e0 RW |
250 | int res; |
251 | ||
7bf23687 | 252 | res = swap_type_of(swsusp_resume_device, swsusp_resume_block, |
8a0d613f | 253 | &hib_resume_bdev); |
3aef83e0 RW |
254 | if (res < 0) |
255 | return res; | |
256 | ||
257 | root_swap = res; | |
e525fd89 | 258 | res = blkdev_get(hib_resume_bdev, FMODE_WRITE, NULL); |
7bf23687 RW |
259 | if (res) |
260 | return res; | |
3aef83e0 | 261 | |
8a0d613f | 262 | res = set_blocksize(hib_resume_bdev, PAGE_SIZE); |
3aef83e0 | 263 | if (res < 0) |
8a0d613f | 264 | blkdev_put(hib_resume_bdev, FMODE_WRITE); |
61159a31 | 265 | |
61159a31 RW |
266 | return res; |
267 | } | |
268 | ||
269 | /** | |
270 | * write_page - Write one page to given swap location. | |
271 | * @buf: Address we're writing. | |
272 | * @offset: Offset of the swap page we're writing to. | |
ab954160 | 273 | * @bio_chain: Link the next write BIO here |
61159a31 RW |
274 | */ |
275 | ||
3aef83e0 | 276 | static int write_page(void *buf, sector_t offset, struct bio **bio_chain) |
61159a31 | 277 | { |
3aef83e0 | 278 | void *src; |
081a9d04 | 279 | int ret; |
3aef83e0 RW |
280 | |
281 | if (!offset) | |
282 | return -ENOSPC; | |
283 | ||
284 | if (bio_chain) { | |
85949121 | 285 | src = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH); |
3aef83e0 | 286 | if (src) { |
3ecb01df | 287 | copy_page(src, buf); |
3aef83e0 | 288 | } else { |
081a9d04 BS |
289 | ret = hib_wait_on_bio_chain(bio_chain); /* Free pages */ |
290 | if (ret) | |
291 | return ret; | |
292 | src = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH); | |
293 | if (src) { | |
294 | copy_page(src, buf); | |
295 | } else { | |
296 | WARN_ON_ONCE(1); | |
297 | bio_chain = NULL; /* Go synchronous */ | |
298 | src = buf; | |
299 | } | |
ab954160 | 300 | } |
3aef83e0 RW |
301 | } else { |
302 | src = buf; | |
61159a31 | 303 | } |
8a0d613f | 304 | return hib_bio_write_page(offset, src, bio_chain); |
61159a31 RW |
305 | } |
306 | ||
61159a31 RW |
307 | static void release_swap_writer(struct swap_map_handle *handle) |
308 | { | |
309 | if (handle->cur) | |
310 | free_page((unsigned long)handle->cur); | |
311 | handle->cur = NULL; | |
61159a31 RW |
312 | } |
313 | ||
314 | static int get_swap_writer(struct swap_map_handle *handle) | |
315 | { | |
6f612af5 JS |
316 | int ret; |
317 | ||
318 | ret = swsusp_swap_check(); | |
319 | if (ret) { | |
320 | if (ret != -ENOSPC) | |
321 | printk(KERN_ERR "PM: Cannot find swap device, try " | |
322 | "swapon -a.\n"); | |
323 | return ret; | |
324 | } | |
61159a31 | 325 | handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL); |
6f612af5 JS |
326 | if (!handle->cur) { |
327 | ret = -ENOMEM; | |
328 | goto err_close; | |
329 | } | |
d1d241cc | 330 | handle->cur_swap = alloc_swapdev_block(root_swap); |
61159a31 | 331 | if (!handle->cur_swap) { |
6f612af5 JS |
332 | ret = -ENOSPC; |
333 | goto err_rel; | |
61159a31 RW |
334 | } |
335 | handle->k = 0; | |
f8262d47 | 336 | handle->reqd_free_pages = reqd_free_pages(); |
51fb352b | 337 | handle->first_sector = handle->cur_swap; |
61159a31 | 338 | return 0; |
6f612af5 JS |
339 | err_rel: |
340 | release_swap_writer(handle); | |
341 | err_close: | |
342 | swsusp_close(FMODE_WRITE); | |
343 | return ret; | |
61159a31 RW |
344 | } |
345 | ||
ab954160 AM |
346 | static int swap_write_page(struct swap_map_handle *handle, void *buf, |
347 | struct bio **bio_chain) | |
348 | { | |
349 | int error = 0; | |
3aef83e0 | 350 | sector_t offset; |
61159a31 RW |
351 | |
352 | if (!handle->cur) | |
353 | return -EINVAL; | |
d1d241cc | 354 | offset = alloc_swapdev_block(root_swap); |
ab954160 | 355 | error = write_page(buf, offset, bio_chain); |
61159a31 RW |
356 | if (error) |
357 | return error; | |
358 | handle->cur->entries[handle->k++] = offset; | |
359 | if (handle->k >= MAP_PAGE_ENTRIES) { | |
d1d241cc | 360 | offset = alloc_swapdev_block(root_swap); |
61159a31 RW |
361 | if (!offset) |
362 | return -ENOSPC; | |
363 | handle->cur->next_swap = offset; | |
081a9d04 | 364 | error = write_page(handle->cur, handle->cur_swap, bio_chain); |
61159a31 | 365 | if (error) |
ab954160 | 366 | goto out; |
3ecb01df | 367 | clear_page(handle->cur); |
61159a31 RW |
368 | handle->cur_swap = offset; |
369 | handle->k = 0; | |
370 | } | |
f8262d47 | 371 | if (bio_chain && low_free_pages() <= handle->reqd_free_pages) { |
081a9d04 BS |
372 | error = hib_wait_on_bio_chain(bio_chain); |
373 | if (error) | |
374 | goto out; | |
f8262d47 | 375 | handle->reqd_free_pages = reqd_free_pages(); |
081a9d04 | 376 | } |
59a49335 | 377 | out: |
ab954160 | 378 | return error; |
61159a31 RW |
379 | } |
380 | ||
381 | static int flush_swap_writer(struct swap_map_handle *handle) | |
382 | { | |
383 | if (handle->cur && handle->cur_swap) | |
ab954160 | 384 | return write_page(handle->cur, handle->cur_swap, NULL); |
61159a31 RW |
385 | else |
386 | return -EINVAL; | |
387 | } | |
388 | ||
6f612af5 JS |
389 | static int swap_writer_finish(struct swap_map_handle *handle, |
390 | unsigned int flags, int error) | |
391 | { | |
392 | if (!error) { | |
393 | flush_swap_writer(handle); | |
394 | printk(KERN_INFO "PM: S"); | |
395 | error = mark_swapfiles(handle, flags); | |
396 | printk("|\n"); | |
397 | } | |
398 | ||
399 | if (error) | |
400 | free_all_swap_pages(root_swap); | |
401 | release_swap_writer(handle); | |
402 | swsusp_close(FMODE_WRITE); | |
403 | ||
404 | return error; | |
405 | } | |
406 | ||
f996fc96 BS |
407 | /* We need to remember how much compressed data we need to read. */ |
408 | #define LZO_HEADER sizeof(size_t) | |
409 | ||
410 | /* Number of pages/bytes we'll compress at one time. */ | |
411 | #define LZO_UNC_PAGES 32 | |
412 | #define LZO_UNC_SIZE (LZO_UNC_PAGES * PAGE_SIZE) | |
413 | ||
414 | /* Number of pages/bytes we need for compressed data (worst case). */ | |
415 | #define LZO_CMP_PAGES DIV_ROUND_UP(lzo1x_worst_compress(LZO_UNC_SIZE) + \ | |
416 | LZO_HEADER, PAGE_SIZE) | |
417 | #define LZO_CMP_SIZE (LZO_CMP_PAGES * PAGE_SIZE) | |
418 | ||
081a9d04 BS |
419 | /* Maximum number of threads for compression/decompression. */ |
420 | #define LZO_THREADS 3 | |
421 | ||
422 | /* Maximum number of pages for read buffering. */ | |
423 | #define LZO_READ_PAGES (MAP_PAGE_ENTRIES * 8) | |
424 | ||
425 | ||
61159a31 RW |
426 | /** |
427 | * save_image - save the suspend image data | |
428 | */ | |
429 | ||
430 | static int save_image(struct swap_map_handle *handle, | |
431 | struct snapshot_handle *snapshot, | |
3a4f7577 | 432 | unsigned int nr_to_write) |
61159a31 RW |
433 | { |
434 | unsigned int m; | |
435 | int ret; | |
3a4f7577 | 436 | int nr_pages; |
ab954160 AM |
437 | int err2; |
438 | struct bio *bio; | |
3a4f7577 AM |
439 | struct timeval start; |
440 | struct timeval stop; | |
61159a31 | 441 | |
23976728 RW |
442 | printk(KERN_INFO "PM: Saving image data pages (%u pages) ... ", |
443 | nr_to_write); | |
3a4f7577 | 444 | m = nr_to_write / 100; |
61159a31 RW |
445 | if (!m) |
446 | m = 1; | |
447 | nr_pages = 0; | |
ab954160 | 448 | bio = NULL; |
3a4f7577 | 449 | do_gettimeofday(&start); |
4ff277f9 | 450 | while (1) { |
d3c1b24c | 451 | ret = snapshot_read_next(snapshot); |
4ff277f9 JS |
452 | if (ret <= 0) |
453 | break; | |
454 | ret = swap_write_page(handle, data_of(*snapshot), &bio); | |
455 | if (ret) | |
456 | break; | |
457 | if (!(nr_pages % m)) | |
66d0ae4d | 458 | printk(KERN_CONT "\b\b\b\b%3d%%", nr_pages / m); |
4ff277f9 JS |
459 | nr_pages++; |
460 | } | |
8a0d613f | 461 | err2 = hib_wait_on_bio_chain(&bio); |
3a4f7577 | 462 | do_gettimeofday(&stop); |
4ff277f9 JS |
463 | if (!ret) |
464 | ret = err2; | |
465 | if (!ret) | |
66d0ae4d | 466 | printk(KERN_CONT "\b\b\b\bdone\n"); |
4ff277f9 | 467 | else |
66d0ae4d | 468 | printk(KERN_CONT "\n"); |
0d3a9abe | 469 | swsusp_show_speed(&start, &stop, nr_to_write, "Wrote"); |
4ff277f9 | 470 | return ret; |
61159a31 RW |
471 | } |
472 | ||
081a9d04 BS |
473 | /** |
474 | * Structure used for CRC32. | |
475 | */ | |
476 | struct crc_data { | |
477 | struct task_struct *thr; /* thread */ | |
478 | atomic_t ready; /* ready to start flag */ | |
479 | atomic_t stop; /* ready to stop flag */ | |
480 | unsigned run_threads; /* nr current threads */ | |
481 | wait_queue_head_t go; /* start crc update */ | |
482 | wait_queue_head_t done; /* crc update done */ | |
483 | u32 *crc32; /* points to handle's crc32 */ | |
484 | size_t *unc_len[LZO_THREADS]; /* uncompressed lengths */ | |
485 | unsigned char *unc[LZO_THREADS]; /* uncompressed data */ | |
486 | }; | |
487 | ||
488 | /** | |
489 | * CRC32 update function that runs in its own thread. | |
490 | */ | |
491 | static int crc32_threadfn(void *data) | |
492 | { | |
493 | struct crc_data *d = data; | |
494 | unsigned i; | |
495 | ||
496 | while (1) { | |
497 | wait_event(d->go, atomic_read(&d->ready) || | |
498 | kthread_should_stop()); | |
499 | if (kthread_should_stop()) { | |
500 | d->thr = NULL; | |
501 | atomic_set(&d->stop, 1); | |
502 | wake_up(&d->done); | |
503 | break; | |
504 | } | |
505 | atomic_set(&d->ready, 0); | |
506 | ||
507 | for (i = 0; i < d->run_threads; i++) | |
508 | *d->crc32 = crc32_le(*d->crc32, | |
509 | d->unc[i], *d->unc_len[i]); | |
510 | atomic_set(&d->stop, 1); | |
511 | wake_up(&d->done); | |
512 | } | |
513 | return 0; | |
514 | } | |
515 | /** | |
516 | * Structure used for LZO data compression. | |
517 | */ | |
518 | struct cmp_data { | |
519 | struct task_struct *thr; /* thread */ | |
520 | atomic_t ready; /* ready to start flag */ | |
521 | atomic_t stop; /* ready to stop flag */ | |
522 | int ret; /* return code */ | |
523 | wait_queue_head_t go; /* start compression */ | |
524 | wait_queue_head_t done; /* compression done */ | |
525 | size_t unc_len; /* uncompressed length */ | |
526 | size_t cmp_len; /* compressed length */ | |
527 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ | |
528 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ | |
529 | unsigned char wrk[LZO1X_1_MEM_COMPRESS]; /* compression workspace */ | |
530 | }; | |
531 | ||
532 | /** | |
533 | * Compression function that runs in its own thread. | |
534 | */ | |
535 | static int lzo_compress_threadfn(void *data) | |
536 | { | |
537 | struct cmp_data *d = data; | |
538 | ||
539 | while (1) { | |
540 | wait_event(d->go, atomic_read(&d->ready) || | |
541 | kthread_should_stop()); | |
542 | if (kthread_should_stop()) { | |
543 | d->thr = NULL; | |
544 | d->ret = -1; | |
545 | atomic_set(&d->stop, 1); | |
546 | wake_up(&d->done); | |
547 | break; | |
548 | } | |
549 | atomic_set(&d->ready, 0); | |
550 | ||
551 | d->ret = lzo1x_1_compress(d->unc, d->unc_len, | |
552 | d->cmp + LZO_HEADER, &d->cmp_len, | |
553 | d->wrk); | |
554 | atomic_set(&d->stop, 1); | |
555 | wake_up(&d->done); | |
556 | } | |
557 | return 0; | |
558 | } | |
f996fc96 BS |
559 | |
560 | /** | |
561 | * save_image_lzo - Save the suspend image data compressed with LZO. | |
562 | * @handle: Swap mam handle to use for saving the image. | |
563 | * @snapshot: Image to read data from. | |
564 | * @nr_to_write: Number of pages to save. | |
565 | */ | |
566 | static int save_image_lzo(struct swap_map_handle *handle, | |
567 | struct snapshot_handle *snapshot, | |
568 | unsigned int nr_to_write) | |
569 | { | |
570 | unsigned int m; | |
571 | int ret = 0; | |
572 | int nr_pages; | |
573 | int err2; | |
574 | struct bio *bio; | |
575 | struct timeval start; | |
576 | struct timeval stop; | |
081a9d04 BS |
577 | size_t off; |
578 | unsigned thr, run_threads, nr_threads; | |
579 | unsigned char *page = NULL; | |
580 | struct cmp_data *data = NULL; | |
581 | struct crc_data *crc = NULL; | |
582 | ||
583 | /* | |
584 | * We'll limit the number of threads for compression to limit memory | |
585 | * footprint. | |
586 | */ | |
587 | nr_threads = num_online_cpus() - 1; | |
588 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); | |
f996fc96 BS |
589 | |
590 | page = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH); | |
591 | if (!page) { | |
592 | printk(KERN_ERR "PM: Failed to allocate LZO page\n"); | |
081a9d04 BS |
593 | ret = -ENOMEM; |
594 | goto out_clean; | |
f996fc96 BS |
595 | } |
596 | ||
081a9d04 BS |
597 | data = vmalloc(sizeof(*data) * nr_threads); |
598 | if (!data) { | |
599 | printk(KERN_ERR "PM: Failed to allocate LZO data\n"); | |
600 | ret = -ENOMEM; | |
601 | goto out_clean; | |
f996fc96 | 602 | } |
081a9d04 BS |
603 | for (thr = 0; thr < nr_threads; thr++) |
604 | memset(&data[thr], 0, offsetof(struct cmp_data, go)); | |
f996fc96 | 605 | |
081a9d04 BS |
606 | crc = kmalloc(sizeof(*crc), GFP_KERNEL); |
607 | if (!crc) { | |
608 | printk(KERN_ERR "PM: Failed to allocate crc\n"); | |
609 | ret = -ENOMEM; | |
610 | goto out_clean; | |
611 | } | |
612 | memset(crc, 0, offsetof(struct crc_data, go)); | |
613 | ||
614 | /* | |
615 | * Start the compression threads. | |
616 | */ | |
617 | for (thr = 0; thr < nr_threads; thr++) { | |
618 | init_waitqueue_head(&data[thr].go); | |
619 | init_waitqueue_head(&data[thr].done); | |
620 | ||
621 | data[thr].thr = kthread_run(lzo_compress_threadfn, | |
622 | &data[thr], | |
623 | "image_compress/%u", thr); | |
624 | if (IS_ERR(data[thr].thr)) { | |
625 | data[thr].thr = NULL; | |
626 | printk(KERN_ERR | |
627 | "PM: Cannot start compression threads\n"); | |
628 | ret = -ENOMEM; | |
629 | goto out_clean; | |
630 | } | |
f996fc96 BS |
631 | } |
632 | ||
081a9d04 BS |
633 | /* |
634 | * Adjust number of free pages after all allocations have been done. | |
635 | * We don't want to run out of pages when writing. | |
636 | */ | |
f8262d47 | 637 | handle->reqd_free_pages = reqd_free_pages(); |
081a9d04 BS |
638 | |
639 | /* | |
640 | * Start the CRC32 thread. | |
641 | */ | |
642 | init_waitqueue_head(&crc->go); | |
643 | init_waitqueue_head(&crc->done); | |
644 | ||
645 | handle->crc32 = 0; | |
646 | crc->crc32 = &handle->crc32; | |
647 | for (thr = 0; thr < nr_threads; thr++) { | |
648 | crc->unc[thr] = data[thr].unc; | |
649 | crc->unc_len[thr] = &data[thr].unc_len; | |
650 | } | |
651 | ||
652 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); | |
653 | if (IS_ERR(crc->thr)) { | |
654 | crc->thr = NULL; | |
655 | printk(KERN_ERR "PM: Cannot start CRC32 thread\n"); | |
656 | ret = -ENOMEM; | |
657 | goto out_clean; | |
f996fc96 BS |
658 | } |
659 | ||
660 | printk(KERN_INFO | |
081a9d04 | 661 | "PM: Using %u thread(s) for compression.\n" |
f996fc96 | 662 | "PM: Compressing and saving image data (%u pages) ... ", |
081a9d04 | 663 | nr_threads, nr_to_write); |
f996fc96 BS |
664 | m = nr_to_write / 100; |
665 | if (!m) | |
666 | m = 1; | |
667 | nr_pages = 0; | |
668 | bio = NULL; | |
669 | do_gettimeofday(&start); | |
670 | for (;;) { | |
081a9d04 BS |
671 | for (thr = 0; thr < nr_threads; thr++) { |
672 | for (off = 0; off < LZO_UNC_SIZE; off += PAGE_SIZE) { | |
673 | ret = snapshot_read_next(snapshot); | |
674 | if (ret < 0) | |
675 | goto out_finish; | |
676 | ||
677 | if (!ret) | |
678 | break; | |
679 | ||
680 | memcpy(data[thr].unc + off, | |
681 | data_of(*snapshot), PAGE_SIZE); | |
682 | ||
683 | if (!(nr_pages % m)) | |
684 | printk(KERN_CONT "\b\b\b\b%3d%%", | |
685 | nr_pages / m); | |
686 | nr_pages++; | |
687 | } | |
688 | if (!off) | |
f996fc96 BS |
689 | break; |
690 | ||
081a9d04 | 691 | data[thr].unc_len = off; |
f996fc96 | 692 | |
081a9d04 BS |
693 | atomic_set(&data[thr].ready, 1); |
694 | wake_up(&data[thr].go); | |
f996fc96 BS |
695 | } |
696 | ||
081a9d04 | 697 | if (!thr) |
f996fc96 BS |
698 | break; |
699 | ||
081a9d04 BS |
700 | crc->run_threads = thr; |
701 | atomic_set(&crc->ready, 1); | |
702 | wake_up(&crc->go); | |
f996fc96 | 703 | |
081a9d04 BS |
704 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
705 | wait_event(data[thr].done, | |
706 | atomic_read(&data[thr].stop)); | |
707 | atomic_set(&data[thr].stop, 0); | |
f996fc96 | 708 | |
081a9d04 | 709 | ret = data[thr].ret; |
f996fc96 | 710 | |
081a9d04 BS |
711 | if (ret < 0) { |
712 | printk(KERN_ERR "PM: LZO compression failed\n"); | |
713 | goto out_finish; | |
714 | } | |
f996fc96 | 715 | |
081a9d04 BS |
716 | if (unlikely(!data[thr].cmp_len || |
717 | data[thr].cmp_len > | |
718 | lzo1x_worst_compress(data[thr].unc_len))) { | |
719 | printk(KERN_ERR | |
720 | "PM: Invalid LZO compressed length\n"); | |
721 | ret = -1; | |
f996fc96 | 722 | goto out_finish; |
081a9d04 BS |
723 | } |
724 | ||
725 | *(size_t *)data[thr].cmp = data[thr].cmp_len; | |
726 | ||
727 | /* | |
728 | * Given we are writing one page at a time to disk, we | |
729 | * copy that much from the buffer, although the last | |
730 | * bit will likely be smaller than full page. This is | |
731 | * OK - we saved the length of the compressed data, so | |
732 | * any garbage at the end will be discarded when we | |
733 | * read it. | |
734 | */ | |
735 | for (off = 0; | |
736 | off < LZO_HEADER + data[thr].cmp_len; | |
737 | off += PAGE_SIZE) { | |
738 | memcpy(page, data[thr].cmp + off, PAGE_SIZE); | |
739 | ||
740 | ret = swap_write_page(handle, page, &bio); | |
741 | if (ret) | |
742 | goto out_finish; | |
743 | } | |
f996fc96 | 744 | } |
081a9d04 BS |
745 | |
746 | wait_event(crc->done, atomic_read(&crc->stop)); | |
747 | atomic_set(&crc->stop, 0); | |
f996fc96 BS |
748 | } |
749 | ||
750 | out_finish: | |
751 | err2 = hib_wait_on_bio_chain(&bio); | |
752 | do_gettimeofday(&stop); | |
753 | if (!ret) | |
754 | ret = err2; | |
081a9d04 | 755 | if (!ret) { |
f996fc96 | 756 | printk(KERN_CONT "\b\b\b\bdone\n"); |
081a9d04 | 757 | } else { |
f996fc96 | 758 | printk(KERN_CONT "\n"); |
081a9d04 | 759 | } |
f996fc96 | 760 | swsusp_show_speed(&start, &stop, nr_to_write, "Wrote"); |
081a9d04 BS |
761 | out_clean: |
762 | if (crc) { | |
763 | if (crc->thr) | |
764 | kthread_stop(crc->thr); | |
765 | kfree(crc); | |
766 | } | |
767 | if (data) { | |
768 | for (thr = 0; thr < nr_threads; thr++) | |
769 | if (data[thr].thr) | |
770 | kthread_stop(data[thr].thr); | |
771 | vfree(data); | |
772 | } | |
773 | if (page) free_page((unsigned long)page); | |
f996fc96 BS |
774 | |
775 | return ret; | |
776 | } | |
777 | ||
61159a31 RW |
778 | /** |
779 | * enough_swap - Make sure we have enough swap to save the image. | |
780 | * | |
781 | * Returns TRUE or FALSE after checking the total amount of swap | |
782 | * space avaiable from the resume partition. | |
783 | */ | |
784 | ||
f996fc96 | 785 | static int enough_swap(unsigned int nr_pages, unsigned int flags) |
61159a31 RW |
786 | { |
787 | unsigned int free_swap = count_swap_pages(root_swap, 1); | |
f996fc96 | 788 | unsigned int required; |
61159a31 | 789 | |
23976728 | 790 | pr_debug("PM: Free swap pages: %u\n", free_swap); |
f996fc96 | 791 | |
ee34a370 | 792 | required = PAGES_FOR_IO + nr_pages; |
f996fc96 | 793 | return free_swap > required; |
61159a31 RW |
794 | } |
795 | ||
796 | /** | |
797 | * swsusp_write - Write entire image and metadata. | |
a634cc10 | 798 | * @flags: flags to pass to the "boot" kernel in the image header |
61159a31 RW |
799 | * |
800 | * It is important _NOT_ to umount filesystems at this point. We want | |
801 | * them synced (in case something goes wrong) but we DO not want to mark | |
802 | * filesystem clean: it is not. (And it does not matter, if we resume | |
803 | * correctly, we'll mark system clean, anyway.) | |
804 | */ | |
805 | ||
a634cc10 | 806 | int swsusp_write(unsigned int flags) |
61159a31 RW |
807 | { |
808 | struct swap_map_handle handle; | |
809 | struct snapshot_handle snapshot; | |
810 | struct swsusp_info *header; | |
6f612af5 | 811 | unsigned long pages; |
61159a31 RW |
812 | int error; |
813 | ||
6f612af5 JS |
814 | pages = snapshot_get_image_size(); |
815 | error = get_swap_writer(&handle); | |
3aef83e0 | 816 | if (error) { |
6f612af5 | 817 | printk(KERN_ERR "PM: Cannot get swap writer\n"); |
61159a31 RW |
818 | return error; |
819 | } | |
ee34a370 BS |
820 | if (flags & SF_NOCOMPRESS_MODE) { |
821 | if (!enough_swap(pages, flags)) { | |
822 | printk(KERN_ERR "PM: Not enough free swap\n"); | |
823 | error = -ENOSPC; | |
824 | goto out_finish; | |
825 | } | |
6f612af5 | 826 | } |
61159a31 | 827 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 828 | error = snapshot_read_next(&snapshot); |
3aef83e0 RW |
829 | if (error < PAGE_SIZE) { |
830 | if (error >= 0) | |
831 | error = -EFAULT; | |
832 | ||
6f612af5 | 833 | goto out_finish; |
3aef83e0 | 834 | } |
61159a31 | 835 | header = (struct swsusp_info *)data_of(snapshot); |
6f612af5 | 836 | error = swap_write_page(&handle, header, NULL); |
f996fc96 BS |
837 | if (!error) { |
838 | error = (flags & SF_NOCOMPRESS_MODE) ? | |
839 | save_image(&handle, &snapshot, pages - 1) : | |
840 | save_image_lzo(&handle, &snapshot, pages - 1); | |
841 | } | |
6f612af5 JS |
842 | out_finish: |
843 | error = swap_writer_finish(&handle, flags, error); | |
61159a31 RW |
844 | return error; |
845 | } | |
846 | ||
61159a31 RW |
847 | /** |
848 | * The following functions allow us to read data using a swap map | |
849 | * in a file-alike way | |
850 | */ | |
851 | ||
852 | static void release_swap_reader(struct swap_map_handle *handle) | |
853 | { | |
081a9d04 BS |
854 | struct swap_map_page_list *tmp; |
855 | ||
856 | while (handle->maps) { | |
857 | if (handle->maps->map) | |
858 | free_page((unsigned long)handle->maps->map); | |
859 | tmp = handle->maps; | |
860 | handle->maps = handle->maps->next; | |
861 | kfree(tmp); | |
862 | } | |
61159a31 RW |
863 | handle->cur = NULL; |
864 | } | |
865 | ||
6f612af5 JS |
866 | static int get_swap_reader(struct swap_map_handle *handle, |
867 | unsigned int *flags_p) | |
61159a31 RW |
868 | { |
869 | int error; | |
081a9d04 BS |
870 | struct swap_map_page_list *tmp, *last; |
871 | sector_t offset; | |
61159a31 | 872 | |
6f612af5 JS |
873 | *flags_p = swsusp_header->flags; |
874 | ||
875 | if (!swsusp_header->image) /* how can this happen? */ | |
61159a31 | 876 | return -EINVAL; |
3aef83e0 | 877 | |
081a9d04 BS |
878 | handle->cur = NULL; |
879 | last = handle->maps = NULL; | |
880 | offset = swsusp_header->image; | |
881 | while (offset) { | |
882 | tmp = kmalloc(sizeof(*handle->maps), GFP_KERNEL); | |
883 | if (!tmp) { | |
884 | release_swap_reader(handle); | |
885 | return -ENOMEM; | |
886 | } | |
887 | memset(tmp, 0, sizeof(*tmp)); | |
888 | if (!handle->maps) | |
889 | handle->maps = tmp; | |
890 | if (last) | |
891 | last->next = tmp; | |
892 | last = tmp; | |
893 | ||
894 | tmp->map = (struct swap_map_page *) | |
895 | __get_free_page(__GFP_WAIT | __GFP_HIGH); | |
896 | if (!tmp->map) { | |
897 | release_swap_reader(handle); | |
898 | return -ENOMEM; | |
899 | } | |
3aef83e0 | 900 | |
081a9d04 BS |
901 | error = hib_bio_read_page(offset, tmp->map, NULL); |
902 | if (error) { | |
903 | release_swap_reader(handle); | |
904 | return error; | |
905 | } | |
906 | offset = tmp->map->next_swap; | |
61159a31 RW |
907 | } |
908 | handle->k = 0; | |
081a9d04 | 909 | handle->cur = handle->maps->map; |
61159a31 RW |
910 | return 0; |
911 | } | |
912 | ||
546e0d27 AM |
913 | static int swap_read_page(struct swap_map_handle *handle, void *buf, |
914 | struct bio **bio_chain) | |
61159a31 | 915 | { |
3aef83e0 | 916 | sector_t offset; |
61159a31 | 917 | int error; |
081a9d04 | 918 | struct swap_map_page_list *tmp; |
61159a31 RW |
919 | |
920 | if (!handle->cur) | |
921 | return -EINVAL; | |
922 | offset = handle->cur->entries[handle->k]; | |
923 | if (!offset) | |
924 | return -EFAULT; | |
8a0d613f | 925 | error = hib_bio_read_page(offset, buf, bio_chain); |
61159a31 RW |
926 | if (error) |
927 | return error; | |
928 | if (++handle->k >= MAP_PAGE_ENTRIES) { | |
929 | handle->k = 0; | |
081a9d04 BS |
930 | free_page((unsigned long)handle->maps->map); |
931 | tmp = handle->maps; | |
932 | handle->maps = handle->maps->next; | |
933 | kfree(tmp); | |
934 | if (!handle->maps) | |
61159a31 | 935 | release_swap_reader(handle); |
081a9d04 BS |
936 | else |
937 | handle->cur = handle->maps->map; | |
61159a31 RW |
938 | } |
939 | return error; | |
940 | } | |
941 | ||
6f612af5 JS |
942 | static int swap_reader_finish(struct swap_map_handle *handle) |
943 | { | |
944 | release_swap_reader(handle); | |
945 | ||
946 | return 0; | |
947 | } | |
948 | ||
61159a31 RW |
949 | /** |
950 | * load_image - load the image using the swap map handle | |
951 | * @handle and the snapshot handle @snapshot | |
952 | * (assume there are @nr_pages pages to load) | |
953 | */ | |
954 | ||
955 | static int load_image(struct swap_map_handle *handle, | |
956 | struct snapshot_handle *snapshot, | |
546e0d27 | 957 | unsigned int nr_to_read) |
61159a31 RW |
958 | { |
959 | unsigned int m; | |
081a9d04 | 960 | int ret = 0; |
8c002494 AM |
961 | struct timeval start; |
962 | struct timeval stop; | |
546e0d27 AM |
963 | struct bio *bio; |
964 | int err2; | |
965 | unsigned nr_pages; | |
61159a31 | 966 | |
23976728 RW |
967 | printk(KERN_INFO "PM: Loading image data pages (%u pages) ... ", |
968 | nr_to_read); | |
546e0d27 | 969 | m = nr_to_read / 100; |
61159a31 RW |
970 | if (!m) |
971 | m = 1; | |
972 | nr_pages = 0; | |
546e0d27 | 973 | bio = NULL; |
8c002494 | 974 | do_gettimeofday(&start); |
546e0d27 | 975 | for ( ; ; ) { |
081a9d04 BS |
976 | ret = snapshot_write_next(snapshot); |
977 | if (ret <= 0) | |
546e0d27 | 978 | break; |
081a9d04 BS |
979 | ret = swap_read_page(handle, data_of(*snapshot), &bio); |
980 | if (ret) | |
546e0d27 AM |
981 | break; |
982 | if (snapshot->sync_read) | |
081a9d04 BS |
983 | ret = hib_wait_on_bio_chain(&bio); |
984 | if (ret) | |
546e0d27 AM |
985 | break; |
986 | if (!(nr_pages % m)) | |
987 | printk("\b\b\b\b%3d%%", nr_pages / m); | |
988 | nr_pages++; | |
989 | } | |
8a0d613f | 990 | err2 = hib_wait_on_bio_chain(&bio); |
8c002494 | 991 | do_gettimeofday(&stop); |
081a9d04 BS |
992 | if (!ret) |
993 | ret = err2; | |
994 | if (!ret) { | |
61159a31 | 995 | printk("\b\b\b\bdone\n"); |
8357376d | 996 | snapshot_write_finalize(snapshot); |
e655a250 | 997 | if (!snapshot_image_loaded(snapshot)) |
081a9d04 | 998 | ret = -ENODATA; |
bf9fd67a JS |
999 | } else |
1000 | printk("\n"); | |
0d3a9abe | 1001 | swsusp_show_speed(&start, &stop, nr_to_read, "Read"); |
081a9d04 BS |
1002 | return ret; |
1003 | } | |
1004 | ||
1005 | /** | |
1006 | * Structure used for LZO data decompression. | |
1007 | */ | |
1008 | struct dec_data { | |
1009 | struct task_struct *thr; /* thread */ | |
1010 | atomic_t ready; /* ready to start flag */ | |
1011 | atomic_t stop; /* ready to stop flag */ | |
1012 | int ret; /* return code */ | |
1013 | wait_queue_head_t go; /* start decompression */ | |
1014 | wait_queue_head_t done; /* decompression done */ | |
1015 | size_t unc_len; /* uncompressed length */ | |
1016 | size_t cmp_len; /* compressed length */ | |
1017 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ | |
1018 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ | |
1019 | }; | |
1020 | ||
1021 | /** | |
1022 | * Deompression function that runs in its own thread. | |
1023 | */ | |
1024 | static int lzo_decompress_threadfn(void *data) | |
1025 | { | |
1026 | struct dec_data *d = data; | |
1027 | ||
1028 | while (1) { | |
1029 | wait_event(d->go, atomic_read(&d->ready) || | |
1030 | kthread_should_stop()); | |
1031 | if (kthread_should_stop()) { | |
1032 | d->thr = NULL; | |
1033 | d->ret = -1; | |
1034 | atomic_set(&d->stop, 1); | |
1035 | wake_up(&d->done); | |
1036 | break; | |
1037 | } | |
1038 | atomic_set(&d->ready, 0); | |
1039 | ||
1040 | d->unc_len = LZO_UNC_SIZE; | |
1041 | d->ret = lzo1x_decompress_safe(d->cmp + LZO_HEADER, d->cmp_len, | |
1042 | d->unc, &d->unc_len); | |
1043 | atomic_set(&d->stop, 1); | |
1044 | wake_up(&d->done); | |
1045 | } | |
1046 | return 0; | |
61159a31 RW |
1047 | } |
1048 | ||
f996fc96 BS |
1049 | /** |
1050 | * load_image_lzo - Load compressed image data and decompress them with LZO. | |
1051 | * @handle: Swap map handle to use for loading data. | |
1052 | * @snapshot: Image to copy uncompressed data into. | |
1053 | * @nr_to_read: Number of pages to load. | |
1054 | */ | |
1055 | static int load_image_lzo(struct swap_map_handle *handle, | |
1056 | struct snapshot_handle *snapshot, | |
1057 | unsigned int nr_to_read) | |
1058 | { | |
1059 | unsigned int m; | |
081a9d04 BS |
1060 | int ret = 0; |
1061 | int eof = 0; | |
9f339caf | 1062 | struct bio *bio; |
f996fc96 BS |
1063 | struct timeval start; |
1064 | struct timeval stop; | |
1065 | unsigned nr_pages; | |
081a9d04 BS |
1066 | size_t off; |
1067 | unsigned i, thr, run_threads, nr_threads; | |
1068 | unsigned ring = 0, pg = 0, ring_size = 0, | |
1069 | have = 0, want, need, asked = 0; | |
1070 | unsigned long read_pages; | |
1071 | unsigned char **page = NULL; | |
1072 | struct dec_data *data = NULL; | |
1073 | struct crc_data *crc = NULL; | |
1074 | ||
1075 | /* | |
1076 | * We'll limit the number of threads for decompression to limit memory | |
1077 | * footprint. | |
1078 | */ | |
1079 | nr_threads = num_online_cpus() - 1; | |
1080 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); | |
1081 | ||
1082 | page = vmalloc(sizeof(*page) * LZO_READ_PAGES); | |
1083 | if (!page) { | |
1084 | printk(KERN_ERR "PM: Failed to allocate LZO page\n"); | |
1085 | ret = -ENOMEM; | |
1086 | goto out_clean; | |
1087 | } | |
9f339caf | 1088 | |
081a9d04 BS |
1089 | data = vmalloc(sizeof(*data) * nr_threads); |
1090 | if (!data) { | |
1091 | printk(KERN_ERR "PM: Failed to allocate LZO data\n"); | |
1092 | ret = -ENOMEM; | |
1093 | goto out_clean; | |
1094 | } | |
1095 | for (thr = 0; thr < nr_threads; thr++) | |
1096 | memset(&data[thr], 0, offsetof(struct dec_data, go)); | |
9f339caf | 1097 | |
081a9d04 BS |
1098 | crc = kmalloc(sizeof(*crc), GFP_KERNEL); |
1099 | if (!crc) { | |
1100 | printk(KERN_ERR "PM: Failed to allocate crc\n"); | |
1101 | ret = -ENOMEM; | |
1102 | goto out_clean; | |
1103 | } | |
1104 | memset(crc, 0, offsetof(struct crc_data, go)); | |
1105 | ||
1106 | /* | |
1107 | * Start the decompression threads. | |
1108 | */ | |
1109 | for (thr = 0; thr < nr_threads; thr++) { | |
1110 | init_waitqueue_head(&data[thr].go); | |
1111 | init_waitqueue_head(&data[thr].done); | |
1112 | ||
1113 | data[thr].thr = kthread_run(lzo_decompress_threadfn, | |
1114 | &data[thr], | |
1115 | "image_decompress/%u", thr); | |
1116 | if (IS_ERR(data[thr].thr)) { | |
1117 | data[thr].thr = NULL; | |
1118 | printk(KERN_ERR | |
1119 | "PM: Cannot start decompression threads\n"); | |
1120 | ret = -ENOMEM; | |
1121 | goto out_clean; | |
9f339caf | 1122 | } |
f996fc96 BS |
1123 | } |
1124 | ||
081a9d04 BS |
1125 | /* |
1126 | * Start the CRC32 thread. | |
1127 | */ | |
1128 | init_waitqueue_head(&crc->go); | |
1129 | init_waitqueue_head(&crc->done); | |
1130 | ||
1131 | handle->crc32 = 0; | |
1132 | crc->crc32 = &handle->crc32; | |
1133 | for (thr = 0; thr < nr_threads; thr++) { | |
1134 | crc->unc[thr] = data[thr].unc; | |
1135 | crc->unc_len[thr] = &data[thr].unc_len; | |
f996fc96 BS |
1136 | } |
1137 | ||
081a9d04 BS |
1138 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); |
1139 | if (IS_ERR(crc->thr)) { | |
1140 | crc->thr = NULL; | |
1141 | printk(KERN_ERR "PM: Cannot start CRC32 thread\n"); | |
1142 | ret = -ENOMEM; | |
1143 | goto out_clean; | |
1144 | } | |
9f339caf | 1145 | |
081a9d04 BS |
1146 | /* |
1147 | * Adjust number of pages for read buffering, in case we are short. | |
1148 | */ | |
1149 | read_pages = (nr_free_pages() - snapshot_get_image_size()) >> 1; | |
1150 | read_pages = clamp_val(read_pages, LZO_CMP_PAGES, LZO_READ_PAGES); | |
9f339caf | 1151 | |
081a9d04 BS |
1152 | for (i = 0; i < read_pages; i++) { |
1153 | page[i] = (void *)__get_free_page(i < LZO_CMP_PAGES ? | |
1154 | __GFP_WAIT | __GFP_HIGH : | |
1155 | __GFP_WAIT); | |
1156 | if (!page[i]) { | |
1157 | if (i < LZO_CMP_PAGES) { | |
1158 | ring_size = i; | |
1159 | printk(KERN_ERR | |
1160 | "PM: Failed to allocate LZO pages\n"); | |
1161 | ret = -ENOMEM; | |
1162 | goto out_clean; | |
1163 | } else { | |
1164 | break; | |
1165 | } | |
1166 | } | |
f996fc96 | 1167 | } |
081a9d04 | 1168 | want = ring_size = i; |
f996fc96 BS |
1169 | |
1170 | printk(KERN_INFO | |
081a9d04 | 1171 | "PM: Using %u thread(s) for decompression.\n" |
f996fc96 | 1172 | "PM: Loading and decompressing image data (%u pages) ... ", |
081a9d04 | 1173 | nr_threads, nr_to_read); |
f996fc96 BS |
1174 | m = nr_to_read / 100; |
1175 | if (!m) | |
1176 | m = 1; | |
1177 | nr_pages = 0; | |
9f339caf | 1178 | bio = NULL; |
f996fc96 BS |
1179 | do_gettimeofday(&start); |
1180 | ||
081a9d04 BS |
1181 | ret = snapshot_write_next(snapshot); |
1182 | if (ret <= 0) | |
f996fc96 BS |
1183 | goto out_finish; |
1184 | ||
081a9d04 BS |
1185 | for(;;) { |
1186 | for (i = 0; !eof && i < want; i++) { | |
1187 | ret = swap_read_page(handle, page[ring], &bio); | |
1188 | if (ret) { | |
1189 | /* | |
1190 | * On real read error, finish. On end of data, | |
1191 | * set EOF flag and just exit the read loop. | |
1192 | */ | |
1193 | if (handle->cur && | |
1194 | handle->cur->entries[handle->k]) { | |
1195 | goto out_finish; | |
1196 | } else { | |
1197 | eof = 1; | |
1198 | break; | |
1199 | } | |
1200 | } | |
1201 | if (++ring >= ring_size) | |
1202 | ring = 0; | |
f996fc96 | 1203 | } |
081a9d04 BS |
1204 | asked += i; |
1205 | want -= i; | |
f996fc96 | 1206 | |
081a9d04 BS |
1207 | /* |
1208 | * We are out of data, wait for some more. | |
1209 | */ | |
1210 | if (!have) { | |
1211 | if (!asked) | |
1212 | break; | |
1213 | ||
1214 | ret = hib_wait_on_bio_chain(&bio); | |
1215 | if (ret) | |
f996fc96 | 1216 | goto out_finish; |
081a9d04 BS |
1217 | have += asked; |
1218 | asked = 0; | |
1219 | if (eof) | |
1220 | eof = 2; | |
9f339caf | 1221 | } |
f996fc96 | 1222 | |
081a9d04 BS |
1223 | if (crc->run_threads) { |
1224 | wait_event(crc->done, atomic_read(&crc->stop)); | |
1225 | atomic_set(&crc->stop, 0); | |
1226 | crc->run_threads = 0; | |
f996fc96 BS |
1227 | } |
1228 | ||
081a9d04 BS |
1229 | for (thr = 0; have && thr < nr_threads; thr++) { |
1230 | data[thr].cmp_len = *(size_t *)page[pg]; | |
1231 | if (unlikely(!data[thr].cmp_len || | |
1232 | data[thr].cmp_len > | |
1233 | lzo1x_worst_compress(LZO_UNC_SIZE))) { | |
1234 | printk(KERN_ERR | |
1235 | "PM: Invalid LZO compressed length\n"); | |
1236 | ret = -1; | |
1237 | goto out_finish; | |
1238 | } | |
1239 | ||
1240 | need = DIV_ROUND_UP(data[thr].cmp_len + LZO_HEADER, | |
1241 | PAGE_SIZE); | |
1242 | if (need > have) { | |
1243 | if (eof > 1) { | |
1244 | ret = -1; | |
1245 | goto out_finish; | |
1246 | } | |
1247 | break; | |
1248 | } | |
1249 | ||
1250 | for (off = 0; | |
1251 | off < LZO_HEADER + data[thr].cmp_len; | |
1252 | off += PAGE_SIZE) { | |
1253 | memcpy(data[thr].cmp + off, | |
1254 | page[pg], PAGE_SIZE); | |
1255 | have--; | |
1256 | want++; | |
1257 | if (++pg >= ring_size) | |
1258 | pg = 0; | |
1259 | } | |
1260 | ||
1261 | atomic_set(&data[thr].ready, 1); | |
1262 | wake_up(&data[thr].go); | |
f996fc96 BS |
1263 | } |
1264 | ||
081a9d04 BS |
1265 | /* |
1266 | * Wait for more data while we are decompressing. | |
1267 | */ | |
1268 | if (have < LZO_CMP_PAGES && asked) { | |
1269 | ret = hib_wait_on_bio_chain(&bio); | |
1270 | if (ret) | |
1271 | goto out_finish; | |
1272 | have += asked; | |
1273 | asked = 0; | |
1274 | if (eof) | |
1275 | eof = 2; | |
f996fc96 BS |
1276 | } |
1277 | ||
081a9d04 BS |
1278 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
1279 | wait_event(data[thr].done, | |
1280 | atomic_read(&data[thr].stop)); | |
1281 | atomic_set(&data[thr].stop, 0); | |
1282 | ||
1283 | ret = data[thr].ret; | |
f996fc96 | 1284 | |
081a9d04 BS |
1285 | if (ret < 0) { |
1286 | printk(KERN_ERR | |
1287 | "PM: LZO decompression failed\n"); | |
1288 | goto out_finish; | |
1289 | } | |
f996fc96 | 1290 | |
081a9d04 BS |
1291 | if (unlikely(!data[thr].unc_len || |
1292 | data[thr].unc_len > LZO_UNC_SIZE || | |
1293 | data[thr].unc_len & (PAGE_SIZE - 1))) { | |
1294 | printk(KERN_ERR | |
1295 | "PM: Invalid LZO uncompressed length\n"); | |
1296 | ret = -1; | |
f996fc96 | 1297 | goto out_finish; |
081a9d04 BS |
1298 | } |
1299 | ||
1300 | for (off = 0; | |
1301 | off < data[thr].unc_len; off += PAGE_SIZE) { | |
1302 | memcpy(data_of(*snapshot), | |
1303 | data[thr].unc + off, PAGE_SIZE); | |
1304 | ||
1305 | if (!(nr_pages % m)) | |
1306 | printk("\b\b\b\b%3d%%", nr_pages / m); | |
1307 | nr_pages++; | |
1308 | ||
1309 | ret = snapshot_write_next(snapshot); | |
1310 | if (ret <= 0) { | |
1311 | crc->run_threads = thr + 1; | |
1312 | atomic_set(&crc->ready, 1); | |
1313 | wake_up(&crc->go); | |
1314 | goto out_finish; | |
1315 | } | |
1316 | } | |
f996fc96 | 1317 | } |
081a9d04 BS |
1318 | |
1319 | crc->run_threads = thr; | |
1320 | atomic_set(&crc->ready, 1); | |
1321 | wake_up(&crc->go); | |
f996fc96 BS |
1322 | } |
1323 | ||
1324 | out_finish: | |
081a9d04 BS |
1325 | if (crc->run_threads) { |
1326 | wait_event(crc->done, atomic_read(&crc->stop)); | |
1327 | atomic_set(&crc->stop, 0); | |
1328 | } | |
f996fc96 | 1329 | do_gettimeofday(&stop); |
081a9d04 | 1330 | if (!ret) { |
f996fc96 BS |
1331 | printk("\b\b\b\bdone\n"); |
1332 | snapshot_write_finalize(snapshot); | |
1333 | if (!snapshot_image_loaded(snapshot)) | |
081a9d04 BS |
1334 | ret = -ENODATA; |
1335 | if (!ret) { | |
1336 | if (swsusp_header->flags & SF_CRC32_MODE) { | |
1337 | if(handle->crc32 != swsusp_header->crc32) { | |
1338 | printk(KERN_ERR | |
1339 | "PM: Invalid image CRC32!\n"); | |
1340 | ret = -ENODATA; | |
1341 | } | |
1342 | } | |
1343 | } | |
f996fc96 BS |
1344 | } else |
1345 | printk("\n"); | |
1346 | swsusp_show_speed(&start, &stop, nr_to_read, "Read"); | |
081a9d04 BS |
1347 | out_clean: |
1348 | for (i = 0; i < ring_size; i++) | |
9f339caf | 1349 | free_page((unsigned long)page[i]); |
081a9d04 BS |
1350 | if (crc) { |
1351 | if (crc->thr) | |
1352 | kthread_stop(crc->thr); | |
1353 | kfree(crc); | |
1354 | } | |
1355 | if (data) { | |
1356 | for (thr = 0; thr < nr_threads; thr++) | |
1357 | if (data[thr].thr) | |
1358 | kthread_stop(data[thr].thr); | |
1359 | vfree(data); | |
1360 | } | |
1361 | if (page) vfree(page); | |
f996fc96 | 1362 | |
081a9d04 | 1363 | return ret; |
f996fc96 BS |
1364 | } |
1365 | ||
a634cc10 RW |
1366 | /** |
1367 | * swsusp_read - read the hibernation image. | |
1368 | * @flags_p: flags passed by the "frozen" kernel in the image header should | |
b595076a | 1369 | * be written into this memory location |
a634cc10 RW |
1370 | */ |
1371 | ||
1372 | int swsusp_read(unsigned int *flags_p) | |
61159a31 RW |
1373 | { |
1374 | int error; | |
1375 | struct swap_map_handle handle; | |
1376 | struct snapshot_handle snapshot; | |
1377 | struct swsusp_info *header; | |
1378 | ||
61159a31 | 1379 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 1380 | error = snapshot_write_next(&snapshot); |
61159a31 RW |
1381 | if (error < PAGE_SIZE) |
1382 | return error < 0 ? error : -EFAULT; | |
1383 | header = (struct swsusp_info *)data_of(snapshot); | |
6f612af5 JS |
1384 | error = get_swap_reader(&handle, flags_p); |
1385 | if (error) | |
1386 | goto end; | |
61159a31 | 1387 | if (!error) |
546e0d27 | 1388 | error = swap_read_page(&handle, header, NULL); |
f996fc96 BS |
1389 | if (!error) { |
1390 | error = (*flags_p & SF_NOCOMPRESS_MODE) ? | |
1391 | load_image(&handle, &snapshot, header->pages - 1) : | |
1392 | load_image_lzo(&handle, &snapshot, header->pages - 1); | |
1393 | } | |
6f612af5 JS |
1394 | swap_reader_finish(&handle); |
1395 | end: | |
61159a31 | 1396 | if (!error) |
23976728 | 1397 | pr_debug("PM: Image successfully loaded\n"); |
61159a31 | 1398 | else |
23976728 | 1399 | pr_debug("PM: Error %d resuming\n", error); |
61159a31 RW |
1400 | return error; |
1401 | } | |
1402 | ||
1403 | /** | |
1404 | * swsusp_check - Check for swsusp signature in the resume device | |
1405 | */ | |
1406 | ||
1407 | int swsusp_check(void) | |
1408 | { | |
1409 | int error; | |
1410 | ||
d4d77629 TH |
1411 | hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device, |
1412 | FMODE_READ, NULL); | |
8a0d613f JS |
1413 | if (!IS_ERR(hib_resume_bdev)) { |
1414 | set_blocksize(hib_resume_bdev, PAGE_SIZE); | |
3ecb01df | 1415 | clear_page(swsusp_header); |
8a0d613f | 1416 | error = hib_bio_read_page(swsusp_resume_block, |
1b29c164 | 1417 | swsusp_header, NULL); |
9a154d9d | 1418 | if (error) |
76b57e61 | 1419 | goto put; |
9a154d9d | 1420 | |
3624eb04 | 1421 | if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) { |
1b29c164 | 1422 | memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10); |
61159a31 | 1423 | /* Reset swap signature now */ |
8a0d613f | 1424 | error = hib_bio_write_page(swsusp_resume_block, |
1b29c164 | 1425 | swsusp_header, NULL); |
61159a31 | 1426 | } else { |
76b57e61 | 1427 | error = -EINVAL; |
61159a31 | 1428 | } |
76b57e61 JS |
1429 | |
1430 | put: | |
61159a31 | 1431 | if (error) |
8a0d613f | 1432 | blkdev_put(hib_resume_bdev, FMODE_READ); |
61159a31 | 1433 | else |
d0941ead | 1434 | pr_debug("PM: Image signature found, resuming\n"); |
61159a31 | 1435 | } else { |
8a0d613f | 1436 | error = PTR_ERR(hib_resume_bdev); |
61159a31 RW |
1437 | } |
1438 | ||
1439 | if (error) | |
d0941ead | 1440 | pr_debug("PM: Image not found (code %d)\n", error); |
61159a31 RW |
1441 | |
1442 | return error; | |
1443 | } | |
1444 | ||
1445 | /** | |
1446 | * swsusp_close - close swap device. | |
1447 | */ | |
1448 | ||
c2dd0dae | 1449 | void swsusp_close(fmode_t mode) |
61159a31 | 1450 | { |
8a0d613f | 1451 | if (IS_ERR(hib_resume_bdev)) { |
23976728 | 1452 | pr_debug("PM: Image device not initialised\n"); |
61159a31 RW |
1453 | return; |
1454 | } | |
1455 | ||
8a0d613f | 1456 | blkdev_put(hib_resume_bdev, mode); |
61159a31 | 1457 | } |
1b29c164 VG |
1458 | |
1459 | static int swsusp_header_init(void) | |
1460 | { | |
1461 | swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL); | |
1462 | if (!swsusp_header) | |
1463 | panic("Could not allocate memory for swsusp_header\n"); | |
1464 | return 0; | |
1465 | } | |
1466 | ||
1467 | core_initcall(swsusp_header_init); |