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