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