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> | |
61159a31 RW |
33 | |
34 | #include "power.h" | |
35 | ||
be8cd644 | 36 | #define HIBERNATE_SIG "S1SUSPEND" |
61159a31 | 37 | |
51fb352b JS |
38 | /* |
39 | * The swap map is a data structure used for keeping track of each page | |
40 | * written to a swap partition. It consists of many swap_map_page | |
90133673 | 41 | * structures that contain each an array of MAP_PAGE_ENTRIES swap entries. |
51fb352b JS |
42 | * These structures are stored on the swap and linked together with the |
43 | * help of the .next_swap member. | |
44 | * | |
45 | * The swap map is created during suspend. The swap map pages are | |
46 | * allocated and populated one at a time, so we only need one memory | |
47 | * page to set up the entire structure. | |
48 | * | |
081a9d04 | 49 | * During resume we pick up all swap_map_page structures into a list. |
51fb352b JS |
50 | */ |
51 | ||
52 | #define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1) | |
53 | ||
f8262d47 BS |
54 | /* |
55 | * Number of free pages that are not high. | |
56 | */ | |
57 | static inline unsigned long low_free_pages(void) | |
58 | { | |
59 | return nr_free_pages() - nr_free_highpages(); | |
60 | } | |
61 | ||
62 | /* | |
63 | * Number of pages required to be kept free while writing the image. Always | |
64 | * half of all available low pages before the writing starts. | |
65 | */ | |
66 | static inline unsigned long reqd_free_pages(void) | |
67 | { | |
68 | return low_free_pages() / 2; | |
69 | } | |
70 | ||
51fb352b JS |
71 | struct swap_map_page { |
72 | sector_t entries[MAP_PAGE_ENTRIES]; | |
73 | sector_t next_swap; | |
74 | }; | |
75 | ||
081a9d04 BS |
76 | struct swap_map_page_list { |
77 | struct swap_map_page *map; | |
78 | struct swap_map_page_list *next; | |
79 | }; | |
80 | ||
51fb352b JS |
81 | /** |
82 | * The swap_map_handle structure is used for handling swap in | |
83 | * a file-alike way | |
84 | */ | |
85 | ||
86 | struct swap_map_handle { | |
87 | struct swap_map_page *cur; | |
081a9d04 | 88 | struct swap_map_page_list *maps; |
51fb352b JS |
89 | sector_t cur_swap; |
90 | sector_t first_sector; | |
91 | unsigned int k; | |
f8262d47 | 92 | unsigned long reqd_free_pages; |
081a9d04 | 93 | u32 crc32; |
51fb352b JS |
94 | }; |
95 | ||
1b29c164 | 96 | struct swsusp_header { |
081a9d04 BS |
97 | char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int) - |
98 | sizeof(u32)]; | |
99 | u32 crc32; | |
3aef83e0 | 100 | sector_t image; |
a634cc10 | 101 | unsigned int flags; /* Flags to pass to the "boot" kernel */ |
61159a31 RW |
102 | char orig_sig[10]; |
103 | char sig[10]; | |
52f5684c | 104 | } __packed; |
1b29c164 VG |
105 | |
106 | static struct swsusp_header *swsusp_header; | |
61159a31 | 107 | |
0414f2ec NC |
108 | /** |
109 | * The following functions are used for tracing the allocated | |
110 | * swap pages, so that they can be freed in case of an error. | |
111 | */ | |
112 | ||
113 | struct swsusp_extent { | |
114 | struct rb_node node; | |
115 | unsigned long start; | |
116 | unsigned long end; | |
117 | }; | |
118 | ||
119 | static struct rb_root swsusp_extents = RB_ROOT; | |
120 | ||
121 | static int swsusp_extents_insert(unsigned long swap_offset) | |
122 | { | |
123 | struct rb_node **new = &(swsusp_extents.rb_node); | |
124 | struct rb_node *parent = NULL; | |
125 | struct swsusp_extent *ext; | |
126 | ||
127 | /* Figure out where to put the new node */ | |
128 | while (*new) { | |
8316bd72 | 129 | ext = rb_entry(*new, struct swsusp_extent, node); |
0414f2ec NC |
130 | parent = *new; |
131 | if (swap_offset < ext->start) { | |
132 | /* Try to merge */ | |
133 | if (swap_offset == ext->start - 1) { | |
134 | ext->start--; | |
135 | return 0; | |
136 | } | |
137 | new = &((*new)->rb_left); | |
138 | } else if (swap_offset > ext->end) { | |
139 | /* Try to merge */ | |
140 | if (swap_offset == ext->end + 1) { | |
141 | ext->end++; | |
142 | return 0; | |
143 | } | |
144 | new = &((*new)->rb_right); | |
145 | } else { | |
146 | /* It already is in the tree */ | |
147 | return -EINVAL; | |
148 | } | |
149 | } | |
150 | /* Add the new node and rebalance the tree. */ | |
151 | ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL); | |
152 | if (!ext) | |
153 | return -ENOMEM; | |
154 | ||
155 | ext->start = swap_offset; | |
156 | ext->end = swap_offset; | |
157 | rb_link_node(&ext->node, parent, new); | |
158 | rb_insert_color(&ext->node, &swsusp_extents); | |
159 | return 0; | |
160 | } | |
161 | ||
162 | /** | |
163 | * alloc_swapdev_block - allocate a swap page and register that it has | |
164 | * been allocated, so that it can be freed in case of an error. | |
165 | */ | |
166 | ||
167 | sector_t alloc_swapdev_block(int swap) | |
168 | { | |
169 | unsigned long offset; | |
170 | ||
910321ea | 171 | offset = swp_offset(get_swap_page_of_type(swap)); |
0414f2ec NC |
172 | if (offset) { |
173 | if (swsusp_extents_insert(offset)) | |
910321ea | 174 | swap_free(swp_entry(swap, offset)); |
0414f2ec NC |
175 | else |
176 | return swapdev_block(swap, offset); | |
177 | } | |
178 | return 0; | |
179 | } | |
180 | ||
181 | /** | |
182 | * free_all_swap_pages - free swap pages allocated for saving image data. | |
90133673 | 183 | * It also frees the extents used to register which swap entries had been |
0414f2ec NC |
184 | * allocated. |
185 | */ | |
186 | ||
187 | void free_all_swap_pages(int swap) | |
188 | { | |
189 | struct rb_node *node; | |
190 | ||
191 | while ((node = swsusp_extents.rb_node)) { | |
192 | struct swsusp_extent *ext; | |
193 | unsigned long offset; | |
194 | ||
195 | ext = container_of(node, struct swsusp_extent, node); | |
196 | rb_erase(node, &swsusp_extents); | |
197 | for (offset = ext->start; offset <= ext->end; offset++) | |
910321ea | 198 | swap_free(swp_entry(swap, offset)); |
0414f2ec NC |
199 | |
200 | kfree(ext); | |
201 | } | |
202 | } | |
203 | ||
204 | int swsusp_swap_in_use(void) | |
205 | { | |
206 | return (swsusp_extents.rb_node != NULL); | |
207 | } | |
208 | ||
61159a31 | 209 | /* |
3fc6b34f | 210 | * General things |
61159a31 RW |
211 | */ |
212 | ||
213 | static unsigned short root_swap = 0xffff; | |
8a0d613f | 214 | struct block_device *hib_resume_bdev; |
3fc6b34f | 215 | |
3fc6b34f RW |
216 | /* |
217 | * Saving part | |
218 | */ | |
61159a31 | 219 | |
51fb352b | 220 | static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags) |
61159a31 RW |
221 | { |
222 | int error; | |
223 | ||
8a0d613f | 224 | hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL); |
1b29c164 VG |
225 | if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) || |
226 | !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) { | |
227 | memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10); | |
3624eb04 | 228 | memcpy(swsusp_header->sig, HIBERNATE_SIG, 10); |
51fb352b | 229 | swsusp_header->image = handle->first_sector; |
a634cc10 | 230 | swsusp_header->flags = flags; |
081a9d04 BS |
231 | if (flags & SF_CRC32_MODE) |
232 | swsusp_header->crc32 = handle->crc32; | |
8a0d613f | 233 | error = hib_bio_write_page(swsusp_resume_block, |
1b29c164 | 234 | swsusp_header, NULL); |
61159a31 | 235 | } else { |
23976728 | 236 | printk(KERN_ERR "PM: Swap header not found!\n"); |
61159a31 RW |
237 | error = -ENODEV; |
238 | } | |
239 | return error; | |
240 | } | |
241 | ||
242 | /** | |
243 | * swsusp_swap_check - check if the resume device is a swap device | |
244 | * and get its index (if so) | |
6f612af5 JS |
245 | * |
246 | * This is called before saving image | |
61159a31 | 247 | */ |
6f612af5 | 248 | static int swsusp_swap_check(void) |
61159a31 | 249 | { |
3aef83e0 RW |
250 | int res; |
251 | ||
7bf23687 | 252 | res = swap_type_of(swsusp_resume_device, swsusp_resume_block, |
8a0d613f | 253 | &hib_resume_bdev); |
3aef83e0 RW |
254 | if (res < 0) |
255 | return res; | |
256 | ||
257 | root_swap = res; | |
e525fd89 | 258 | res = blkdev_get(hib_resume_bdev, FMODE_WRITE, NULL); |
7bf23687 RW |
259 | if (res) |
260 | return res; | |
3aef83e0 | 261 | |
8a0d613f | 262 | res = set_blocksize(hib_resume_bdev, PAGE_SIZE); |
3aef83e0 | 263 | if (res < 0) |
8a0d613f | 264 | blkdev_put(hib_resume_bdev, FMODE_WRITE); |
61159a31 | 265 | |
61159a31 RW |
266 | return res; |
267 | } | |
268 | ||
269 | /** | |
270 | * write_page - Write one page to given swap location. | |
271 | * @buf: Address we're writing. | |
272 | * @offset: Offset of the swap page we're writing to. | |
ab954160 | 273 | * @bio_chain: Link the next write BIO here |
61159a31 RW |
274 | */ |
275 | ||
3aef83e0 | 276 | static int write_page(void *buf, sector_t offset, struct bio **bio_chain) |
61159a31 | 277 | { |
3aef83e0 | 278 | void *src; |
081a9d04 | 279 | int ret; |
3aef83e0 RW |
280 | |
281 | if (!offset) | |
282 | return -ENOSPC; | |
283 | ||
284 | if (bio_chain) { | |
5a21d489 BS |
285 | src = (void *)__get_free_page(__GFP_WAIT | __GFP_NOWARN | |
286 | __GFP_NORETRY); | |
3aef83e0 | 287 | if (src) { |
3ecb01df | 288 | copy_page(src, buf); |
3aef83e0 | 289 | } else { |
081a9d04 BS |
290 | ret = hib_wait_on_bio_chain(bio_chain); /* Free pages */ |
291 | if (ret) | |
292 | return ret; | |
5a21d489 BS |
293 | src = (void *)__get_free_page(__GFP_WAIT | |
294 | __GFP_NOWARN | | |
295 | __GFP_NORETRY); | |
081a9d04 BS |
296 | if (src) { |
297 | copy_page(src, buf); | |
298 | } else { | |
299 | WARN_ON_ONCE(1); | |
300 | bio_chain = NULL; /* Go synchronous */ | |
301 | src = buf; | |
302 | } | |
ab954160 | 303 | } |
3aef83e0 RW |
304 | } else { |
305 | src = buf; | |
61159a31 | 306 | } |
8a0d613f | 307 | return hib_bio_write_page(offset, src, bio_chain); |
61159a31 RW |
308 | } |
309 | ||
61159a31 RW |
310 | static void release_swap_writer(struct swap_map_handle *handle) |
311 | { | |
312 | if (handle->cur) | |
313 | free_page((unsigned long)handle->cur); | |
314 | handle->cur = NULL; | |
61159a31 RW |
315 | } |
316 | ||
317 | static int get_swap_writer(struct swap_map_handle *handle) | |
318 | { | |
6f612af5 JS |
319 | int ret; |
320 | ||
321 | ret = swsusp_swap_check(); | |
322 | if (ret) { | |
323 | if (ret != -ENOSPC) | |
324 | printk(KERN_ERR "PM: Cannot find swap device, try " | |
325 | "swapon -a.\n"); | |
326 | return ret; | |
327 | } | |
61159a31 | 328 | handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL); |
6f612af5 JS |
329 | if (!handle->cur) { |
330 | ret = -ENOMEM; | |
331 | goto err_close; | |
332 | } | |
d1d241cc | 333 | handle->cur_swap = alloc_swapdev_block(root_swap); |
61159a31 | 334 | if (!handle->cur_swap) { |
6f612af5 JS |
335 | ret = -ENOSPC; |
336 | goto err_rel; | |
61159a31 RW |
337 | } |
338 | handle->k = 0; | |
f8262d47 | 339 | handle->reqd_free_pages = reqd_free_pages(); |
51fb352b | 340 | handle->first_sector = handle->cur_swap; |
61159a31 | 341 | return 0; |
6f612af5 JS |
342 | err_rel: |
343 | release_swap_writer(handle); | |
344 | err_close: | |
345 | swsusp_close(FMODE_WRITE); | |
346 | return ret; | |
61159a31 RW |
347 | } |
348 | ||
ab954160 AM |
349 | static int swap_write_page(struct swap_map_handle *handle, void *buf, |
350 | struct bio **bio_chain) | |
351 | { | |
352 | int error = 0; | |
3aef83e0 | 353 | sector_t offset; |
61159a31 RW |
354 | |
355 | if (!handle->cur) | |
356 | return -EINVAL; | |
d1d241cc | 357 | offset = alloc_swapdev_block(root_swap); |
ab954160 | 358 | error = write_page(buf, offset, bio_chain); |
61159a31 RW |
359 | if (error) |
360 | return error; | |
361 | handle->cur->entries[handle->k++] = offset; | |
362 | if (handle->k >= MAP_PAGE_ENTRIES) { | |
d1d241cc | 363 | offset = alloc_swapdev_block(root_swap); |
61159a31 RW |
364 | if (!offset) |
365 | return -ENOSPC; | |
366 | handle->cur->next_swap = offset; | |
081a9d04 | 367 | error = write_page(handle->cur, handle->cur_swap, bio_chain); |
61159a31 | 368 | if (error) |
ab954160 | 369 | goto out; |
3ecb01df | 370 | clear_page(handle->cur); |
61159a31 RW |
371 | handle->cur_swap = offset; |
372 | handle->k = 0; | |
5a21d489 BS |
373 | |
374 | if (bio_chain && low_free_pages() <= handle->reqd_free_pages) { | |
375 | error = hib_wait_on_bio_chain(bio_chain); | |
376 | if (error) | |
377 | goto out; | |
378 | /* | |
379 | * Recalculate the number of required free pages, to | |
380 | * make sure we never take more than half. | |
381 | */ | |
382 | handle->reqd_free_pages = reqd_free_pages(); | |
383 | } | |
081a9d04 | 384 | } |
59a49335 | 385 | out: |
ab954160 | 386 | return error; |
61159a31 RW |
387 | } |
388 | ||
389 | static int flush_swap_writer(struct swap_map_handle *handle) | |
390 | { | |
391 | if (handle->cur && handle->cur_swap) | |
ab954160 | 392 | return write_page(handle->cur, handle->cur_swap, NULL); |
61159a31 RW |
393 | else |
394 | return -EINVAL; | |
395 | } | |
396 | ||
6f612af5 JS |
397 | static int swap_writer_finish(struct swap_map_handle *handle, |
398 | unsigned int flags, int error) | |
399 | { | |
400 | if (!error) { | |
401 | flush_swap_writer(handle); | |
402 | printk(KERN_INFO "PM: S"); | |
403 | error = mark_swapfiles(handle, flags); | |
404 | printk("|\n"); | |
405 | } | |
406 | ||
407 | if (error) | |
408 | free_all_swap_pages(root_swap); | |
409 | release_swap_writer(handle); | |
410 | swsusp_close(FMODE_WRITE); | |
411 | ||
412 | return error; | |
413 | } | |
414 | ||
f996fc96 BS |
415 | /* We need to remember how much compressed data we need to read. */ |
416 | #define LZO_HEADER sizeof(size_t) | |
417 | ||
418 | /* Number of pages/bytes we'll compress at one time. */ | |
419 | #define LZO_UNC_PAGES 32 | |
420 | #define LZO_UNC_SIZE (LZO_UNC_PAGES * PAGE_SIZE) | |
421 | ||
422 | /* Number of pages/bytes we need for compressed data (worst case). */ | |
423 | #define LZO_CMP_PAGES DIV_ROUND_UP(lzo1x_worst_compress(LZO_UNC_SIZE) + \ | |
424 | LZO_HEADER, PAGE_SIZE) | |
425 | #define LZO_CMP_SIZE (LZO_CMP_PAGES * PAGE_SIZE) | |
426 | ||
081a9d04 BS |
427 | /* Maximum number of threads for compression/decompression. */ |
428 | #define LZO_THREADS 3 | |
429 | ||
5a21d489 BS |
430 | /* Minimum/maximum number of pages for read buffering. */ |
431 | #define LZO_MIN_RD_PAGES 1024 | |
432 | #define LZO_MAX_RD_PAGES 8192 | |
081a9d04 BS |
433 | |
434 | ||
61159a31 RW |
435 | /** |
436 | * save_image - save the suspend image data | |
437 | */ | |
438 | ||
439 | static int save_image(struct swap_map_handle *handle, | |
440 | struct snapshot_handle *snapshot, | |
3a4f7577 | 441 | unsigned int nr_to_write) |
61159a31 RW |
442 | { |
443 | unsigned int m; | |
444 | int ret; | |
3a4f7577 | 445 | int nr_pages; |
ab954160 AM |
446 | int err2; |
447 | struct bio *bio; | |
3a4f7577 AM |
448 | struct timeval start; |
449 | struct timeval stop; | |
61159a31 | 450 | |
d8150d35 | 451 | printk(KERN_INFO "PM: Saving image data pages (%u pages)...\n", |
23976728 | 452 | nr_to_write); |
d8150d35 | 453 | m = nr_to_write / 10; |
61159a31 RW |
454 | if (!m) |
455 | m = 1; | |
456 | nr_pages = 0; | |
ab954160 | 457 | bio = NULL; |
3a4f7577 | 458 | do_gettimeofday(&start); |
4ff277f9 | 459 | while (1) { |
d3c1b24c | 460 | ret = snapshot_read_next(snapshot); |
4ff277f9 JS |
461 | if (ret <= 0) |
462 | break; | |
463 | ret = swap_write_page(handle, data_of(*snapshot), &bio); | |
464 | if (ret) | |
465 | break; | |
466 | if (!(nr_pages % m)) | |
d8150d35 BS |
467 | printk(KERN_INFO "PM: Image saving progress: %3d%%\n", |
468 | nr_pages / m * 10); | |
4ff277f9 JS |
469 | nr_pages++; |
470 | } | |
8a0d613f | 471 | err2 = hib_wait_on_bio_chain(&bio); |
3a4f7577 | 472 | do_gettimeofday(&stop); |
4ff277f9 JS |
473 | if (!ret) |
474 | ret = err2; | |
475 | if (!ret) | |
d8150d35 | 476 | printk(KERN_INFO "PM: Image saving done.\n"); |
0d3a9abe | 477 | swsusp_show_speed(&start, &stop, nr_to_write, "Wrote"); |
4ff277f9 | 478 | return ret; |
61159a31 RW |
479 | } |
480 | ||
081a9d04 BS |
481 | /** |
482 | * Structure used for CRC32. | |
483 | */ | |
484 | struct crc_data { | |
485 | struct task_struct *thr; /* thread */ | |
486 | atomic_t ready; /* ready to start flag */ | |
487 | atomic_t stop; /* ready to stop flag */ | |
488 | unsigned run_threads; /* nr current threads */ | |
489 | wait_queue_head_t go; /* start crc update */ | |
490 | wait_queue_head_t done; /* crc update done */ | |
491 | u32 *crc32; /* points to handle's crc32 */ | |
492 | size_t *unc_len[LZO_THREADS]; /* uncompressed lengths */ | |
493 | unsigned char *unc[LZO_THREADS]; /* uncompressed data */ | |
494 | }; | |
495 | ||
496 | /** | |
497 | * CRC32 update function that runs in its own thread. | |
498 | */ | |
499 | static int crc32_threadfn(void *data) | |
500 | { | |
501 | struct crc_data *d = data; | |
502 | unsigned i; | |
503 | ||
504 | while (1) { | |
505 | wait_event(d->go, atomic_read(&d->ready) || | |
506 | kthread_should_stop()); | |
507 | if (kthread_should_stop()) { | |
508 | d->thr = NULL; | |
509 | atomic_set(&d->stop, 1); | |
510 | wake_up(&d->done); | |
511 | break; | |
512 | } | |
513 | atomic_set(&d->ready, 0); | |
514 | ||
515 | for (i = 0; i < d->run_threads; i++) | |
516 | *d->crc32 = crc32_le(*d->crc32, | |
517 | d->unc[i], *d->unc_len[i]); | |
518 | atomic_set(&d->stop, 1); | |
519 | wake_up(&d->done); | |
520 | } | |
521 | return 0; | |
522 | } | |
523 | /** | |
524 | * Structure used for LZO data compression. | |
525 | */ | |
526 | struct cmp_data { | |
527 | struct task_struct *thr; /* thread */ | |
528 | atomic_t ready; /* ready to start flag */ | |
529 | atomic_t stop; /* ready to stop flag */ | |
530 | int ret; /* return code */ | |
531 | wait_queue_head_t go; /* start compression */ | |
532 | wait_queue_head_t done; /* compression done */ | |
533 | size_t unc_len; /* uncompressed length */ | |
534 | size_t cmp_len; /* compressed length */ | |
535 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ | |
536 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ | |
537 | unsigned char wrk[LZO1X_1_MEM_COMPRESS]; /* compression workspace */ | |
538 | }; | |
539 | ||
540 | /** | |
541 | * Compression function that runs in its own thread. | |
542 | */ | |
543 | static int lzo_compress_threadfn(void *data) | |
544 | { | |
545 | struct cmp_data *d = data; | |
546 | ||
547 | while (1) { | |
548 | wait_event(d->go, atomic_read(&d->ready) || | |
549 | kthread_should_stop()); | |
550 | if (kthread_should_stop()) { | |
551 | d->thr = NULL; | |
552 | d->ret = -1; | |
553 | atomic_set(&d->stop, 1); | |
554 | wake_up(&d->done); | |
555 | break; | |
556 | } | |
557 | atomic_set(&d->ready, 0); | |
558 | ||
559 | d->ret = lzo1x_1_compress(d->unc, d->unc_len, | |
560 | d->cmp + LZO_HEADER, &d->cmp_len, | |
561 | d->wrk); | |
562 | atomic_set(&d->stop, 1); | |
563 | wake_up(&d->done); | |
564 | } | |
565 | return 0; | |
566 | } | |
f996fc96 BS |
567 | |
568 | /** | |
569 | * save_image_lzo - Save the suspend image data compressed with LZO. | |
057b0a75 | 570 | * @handle: Swap map handle to use for saving the image. |
f996fc96 BS |
571 | * @snapshot: Image to read data from. |
572 | * @nr_to_write: Number of pages to save. | |
573 | */ | |
574 | static int save_image_lzo(struct swap_map_handle *handle, | |
575 | struct snapshot_handle *snapshot, | |
576 | unsigned int nr_to_write) | |
577 | { | |
578 | unsigned int m; | |
579 | int ret = 0; | |
580 | int nr_pages; | |
581 | int err2; | |
582 | struct bio *bio; | |
583 | struct timeval start; | |
584 | struct timeval stop; | |
081a9d04 BS |
585 | size_t off; |
586 | unsigned thr, run_threads, nr_threads; | |
587 | unsigned char *page = NULL; | |
588 | struct cmp_data *data = NULL; | |
589 | struct crc_data *crc = NULL; | |
590 | ||
591 | /* | |
592 | * We'll limit the number of threads for compression to limit memory | |
593 | * footprint. | |
594 | */ | |
595 | nr_threads = num_online_cpus() - 1; | |
596 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); | |
f996fc96 BS |
597 | |
598 | page = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH); | |
599 | if (!page) { | |
600 | printk(KERN_ERR "PM: Failed to allocate LZO page\n"); | |
081a9d04 BS |
601 | ret = -ENOMEM; |
602 | goto out_clean; | |
f996fc96 BS |
603 | } |
604 | ||
081a9d04 BS |
605 | data = vmalloc(sizeof(*data) * nr_threads); |
606 | if (!data) { | |
607 | printk(KERN_ERR "PM: Failed to allocate LZO data\n"); | |
608 | ret = -ENOMEM; | |
609 | goto out_clean; | |
f996fc96 | 610 | } |
081a9d04 BS |
611 | for (thr = 0; thr < nr_threads; thr++) |
612 | memset(&data[thr], 0, offsetof(struct cmp_data, go)); | |
f996fc96 | 613 | |
081a9d04 BS |
614 | crc = kmalloc(sizeof(*crc), GFP_KERNEL); |
615 | if (!crc) { | |
616 | printk(KERN_ERR "PM: Failed to allocate crc\n"); | |
617 | ret = -ENOMEM; | |
618 | goto out_clean; | |
619 | } | |
620 | memset(crc, 0, offsetof(struct crc_data, go)); | |
621 | ||
622 | /* | |
623 | * Start the compression threads. | |
624 | */ | |
625 | for (thr = 0; thr < nr_threads; thr++) { | |
626 | init_waitqueue_head(&data[thr].go); | |
627 | init_waitqueue_head(&data[thr].done); | |
628 | ||
629 | data[thr].thr = kthread_run(lzo_compress_threadfn, | |
630 | &data[thr], | |
631 | "image_compress/%u", thr); | |
632 | if (IS_ERR(data[thr].thr)) { | |
633 | data[thr].thr = NULL; | |
634 | printk(KERN_ERR | |
635 | "PM: Cannot start compression threads\n"); | |
636 | ret = -ENOMEM; | |
637 | goto out_clean; | |
638 | } | |
f996fc96 BS |
639 | } |
640 | ||
081a9d04 BS |
641 | /* |
642 | * Start the CRC32 thread. | |
643 | */ | |
644 | init_waitqueue_head(&crc->go); | |
645 | init_waitqueue_head(&crc->done); | |
646 | ||
647 | handle->crc32 = 0; | |
648 | crc->crc32 = &handle->crc32; | |
649 | for (thr = 0; thr < nr_threads; thr++) { | |
650 | crc->unc[thr] = data[thr].unc; | |
651 | crc->unc_len[thr] = &data[thr].unc_len; | |
652 | } | |
653 | ||
654 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); | |
655 | if (IS_ERR(crc->thr)) { | |
656 | crc->thr = NULL; | |
657 | printk(KERN_ERR "PM: Cannot start CRC32 thread\n"); | |
658 | ret = -ENOMEM; | |
659 | goto out_clean; | |
f996fc96 BS |
660 | } |
661 | ||
5a21d489 BS |
662 | /* |
663 | * Adjust the number of required free pages after all allocations have | |
664 | * been done. We don't want to run out of pages when writing. | |
665 | */ | |
666 | handle->reqd_free_pages = reqd_free_pages(); | |
667 | ||
f996fc96 | 668 | printk(KERN_INFO |
081a9d04 | 669 | "PM: Using %u thread(s) for compression.\n" |
d8150d35 | 670 | "PM: Compressing and saving image data (%u pages)...\n", |
081a9d04 | 671 | nr_threads, nr_to_write); |
d8150d35 | 672 | m = nr_to_write / 10; |
f996fc96 BS |
673 | if (!m) |
674 | m = 1; | |
675 | nr_pages = 0; | |
676 | bio = NULL; | |
677 | do_gettimeofday(&start); | |
678 | for (;;) { | |
081a9d04 BS |
679 | for (thr = 0; thr < nr_threads; thr++) { |
680 | for (off = 0; off < LZO_UNC_SIZE; off += PAGE_SIZE) { | |
681 | ret = snapshot_read_next(snapshot); | |
682 | if (ret < 0) | |
683 | goto out_finish; | |
684 | ||
685 | if (!ret) | |
686 | break; | |
687 | ||
688 | memcpy(data[thr].unc + off, | |
689 | data_of(*snapshot), PAGE_SIZE); | |
690 | ||
691 | if (!(nr_pages % m)) | |
d8150d35 BS |
692 | printk(KERN_INFO |
693 | "PM: Image saving progress: " | |
694 | "%3d%%\n", | |
695 | nr_pages / m * 10); | |
081a9d04 BS |
696 | nr_pages++; |
697 | } | |
698 | if (!off) | |
f996fc96 BS |
699 | break; |
700 | ||
081a9d04 | 701 | data[thr].unc_len = off; |
f996fc96 | 702 | |
081a9d04 BS |
703 | atomic_set(&data[thr].ready, 1); |
704 | wake_up(&data[thr].go); | |
f996fc96 BS |
705 | } |
706 | ||
081a9d04 | 707 | if (!thr) |
f996fc96 BS |
708 | break; |
709 | ||
081a9d04 BS |
710 | crc->run_threads = thr; |
711 | atomic_set(&crc->ready, 1); | |
712 | wake_up(&crc->go); | |
f996fc96 | 713 | |
081a9d04 BS |
714 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
715 | wait_event(data[thr].done, | |
716 | atomic_read(&data[thr].stop)); | |
717 | atomic_set(&data[thr].stop, 0); | |
f996fc96 | 718 | |
081a9d04 | 719 | ret = data[thr].ret; |
f996fc96 | 720 | |
081a9d04 BS |
721 | if (ret < 0) { |
722 | printk(KERN_ERR "PM: LZO compression failed\n"); | |
723 | goto out_finish; | |
724 | } | |
f996fc96 | 725 | |
081a9d04 BS |
726 | if (unlikely(!data[thr].cmp_len || |
727 | data[thr].cmp_len > | |
728 | lzo1x_worst_compress(data[thr].unc_len))) { | |
729 | printk(KERN_ERR | |
730 | "PM: Invalid LZO compressed length\n"); | |
731 | ret = -1; | |
f996fc96 | 732 | goto out_finish; |
081a9d04 BS |
733 | } |
734 | ||
735 | *(size_t *)data[thr].cmp = data[thr].cmp_len; | |
736 | ||
737 | /* | |
738 | * Given we are writing one page at a time to disk, we | |
739 | * copy that much from the buffer, although the last | |
740 | * bit will likely be smaller than full page. This is | |
741 | * OK - we saved the length of the compressed data, so | |
742 | * any garbage at the end will be discarded when we | |
743 | * read it. | |
744 | */ | |
745 | for (off = 0; | |
746 | off < LZO_HEADER + data[thr].cmp_len; | |
747 | off += PAGE_SIZE) { | |
748 | memcpy(page, data[thr].cmp + off, PAGE_SIZE); | |
749 | ||
750 | ret = swap_write_page(handle, page, &bio); | |
751 | if (ret) | |
752 | goto out_finish; | |
753 | } | |
f996fc96 | 754 | } |
081a9d04 BS |
755 | |
756 | wait_event(crc->done, atomic_read(&crc->stop)); | |
757 | atomic_set(&crc->stop, 0); | |
f996fc96 BS |
758 | } |
759 | ||
760 | out_finish: | |
761 | err2 = hib_wait_on_bio_chain(&bio); | |
762 | do_gettimeofday(&stop); | |
763 | if (!ret) | |
764 | ret = err2; | |
d8150d35 BS |
765 | if (!ret) |
766 | printk(KERN_INFO "PM: Image saving done.\n"); | |
f996fc96 | 767 | swsusp_show_speed(&start, &stop, nr_to_write, "Wrote"); |
081a9d04 BS |
768 | out_clean: |
769 | if (crc) { | |
770 | if (crc->thr) | |
771 | kthread_stop(crc->thr); | |
772 | kfree(crc); | |
773 | } | |
774 | if (data) { | |
775 | for (thr = 0; thr < nr_threads; thr++) | |
776 | if (data[thr].thr) | |
777 | kthread_stop(data[thr].thr); | |
778 | vfree(data); | |
779 | } | |
780 | if (page) free_page((unsigned long)page); | |
f996fc96 BS |
781 | |
782 | return ret; | |
783 | } | |
784 | ||
61159a31 RW |
785 | /** |
786 | * enough_swap - Make sure we have enough swap to save the image. | |
787 | * | |
788 | * Returns TRUE or FALSE after checking the total amount of swap | |
789 | * space avaiable from the resume partition. | |
790 | */ | |
791 | ||
f996fc96 | 792 | static int enough_swap(unsigned int nr_pages, unsigned int flags) |
61159a31 RW |
793 | { |
794 | unsigned int free_swap = count_swap_pages(root_swap, 1); | |
f996fc96 | 795 | unsigned int required; |
61159a31 | 796 | |
23976728 | 797 | pr_debug("PM: Free swap pages: %u\n", free_swap); |
f996fc96 | 798 | |
ee34a370 | 799 | required = PAGES_FOR_IO + nr_pages; |
f996fc96 | 800 | return free_swap > required; |
61159a31 RW |
801 | } |
802 | ||
803 | /** | |
804 | * swsusp_write - Write entire image and metadata. | |
a634cc10 | 805 | * @flags: flags to pass to the "boot" kernel in the image header |
61159a31 RW |
806 | * |
807 | * It is important _NOT_ to umount filesystems at this point. We want | |
808 | * them synced (in case something goes wrong) but we DO not want to mark | |
809 | * filesystem clean: it is not. (And it does not matter, if we resume | |
810 | * correctly, we'll mark system clean, anyway.) | |
811 | */ | |
812 | ||
a634cc10 | 813 | int swsusp_write(unsigned int flags) |
61159a31 RW |
814 | { |
815 | struct swap_map_handle handle; | |
816 | struct snapshot_handle snapshot; | |
817 | struct swsusp_info *header; | |
6f612af5 | 818 | unsigned long pages; |
61159a31 RW |
819 | int error; |
820 | ||
6f612af5 JS |
821 | pages = snapshot_get_image_size(); |
822 | error = get_swap_writer(&handle); | |
3aef83e0 | 823 | if (error) { |
6f612af5 | 824 | printk(KERN_ERR "PM: Cannot get swap writer\n"); |
61159a31 RW |
825 | return error; |
826 | } | |
ee34a370 BS |
827 | if (flags & SF_NOCOMPRESS_MODE) { |
828 | if (!enough_swap(pages, flags)) { | |
829 | printk(KERN_ERR "PM: Not enough free swap\n"); | |
830 | error = -ENOSPC; | |
831 | goto out_finish; | |
832 | } | |
6f612af5 | 833 | } |
61159a31 | 834 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 835 | error = snapshot_read_next(&snapshot); |
3aef83e0 RW |
836 | if (error < PAGE_SIZE) { |
837 | if (error >= 0) | |
838 | error = -EFAULT; | |
839 | ||
6f612af5 | 840 | goto out_finish; |
3aef83e0 | 841 | } |
61159a31 | 842 | header = (struct swsusp_info *)data_of(snapshot); |
6f612af5 | 843 | error = swap_write_page(&handle, header, NULL); |
f996fc96 BS |
844 | if (!error) { |
845 | error = (flags & SF_NOCOMPRESS_MODE) ? | |
846 | save_image(&handle, &snapshot, pages - 1) : | |
847 | save_image_lzo(&handle, &snapshot, pages - 1); | |
848 | } | |
6f612af5 JS |
849 | out_finish: |
850 | error = swap_writer_finish(&handle, flags, error); | |
61159a31 RW |
851 | return error; |
852 | } | |
853 | ||
61159a31 RW |
854 | /** |
855 | * The following functions allow us to read data using a swap map | |
856 | * in a file-alike way | |
857 | */ | |
858 | ||
859 | static void release_swap_reader(struct swap_map_handle *handle) | |
860 | { | |
081a9d04 BS |
861 | struct swap_map_page_list *tmp; |
862 | ||
863 | while (handle->maps) { | |
864 | if (handle->maps->map) | |
865 | free_page((unsigned long)handle->maps->map); | |
866 | tmp = handle->maps; | |
867 | handle->maps = handle->maps->next; | |
868 | kfree(tmp); | |
869 | } | |
61159a31 RW |
870 | handle->cur = NULL; |
871 | } | |
872 | ||
6f612af5 JS |
873 | static int get_swap_reader(struct swap_map_handle *handle, |
874 | unsigned int *flags_p) | |
61159a31 RW |
875 | { |
876 | int error; | |
081a9d04 BS |
877 | struct swap_map_page_list *tmp, *last; |
878 | sector_t offset; | |
61159a31 | 879 | |
6f612af5 JS |
880 | *flags_p = swsusp_header->flags; |
881 | ||
882 | if (!swsusp_header->image) /* how can this happen? */ | |
61159a31 | 883 | return -EINVAL; |
3aef83e0 | 884 | |
081a9d04 BS |
885 | handle->cur = NULL; |
886 | last = handle->maps = NULL; | |
887 | offset = swsusp_header->image; | |
888 | while (offset) { | |
889 | tmp = kmalloc(sizeof(*handle->maps), GFP_KERNEL); | |
890 | if (!tmp) { | |
891 | release_swap_reader(handle); | |
892 | return -ENOMEM; | |
893 | } | |
894 | memset(tmp, 0, sizeof(*tmp)); | |
895 | if (!handle->maps) | |
896 | handle->maps = tmp; | |
897 | if (last) | |
898 | last->next = tmp; | |
899 | last = tmp; | |
900 | ||
901 | tmp->map = (struct swap_map_page *) | |
902 | __get_free_page(__GFP_WAIT | __GFP_HIGH); | |
903 | if (!tmp->map) { | |
904 | release_swap_reader(handle); | |
905 | return -ENOMEM; | |
906 | } | |
3aef83e0 | 907 | |
081a9d04 BS |
908 | error = hib_bio_read_page(offset, tmp->map, NULL); |
909 | if (error) { | |
910 | release_swap_reader(handle); | |
911 | return error; | |
912 | } | |
913 | offset = tmp->map->next_swap; | |
61159a31 RW |
914 | } |
915 | handle->k = 0; | |
081a9d04 | 916 | handle->cur = handle->maps->map; |
61159a31 RW |
917 | return 0; |
918 | } | |
919 | ||
546e0d27 AM |
920 | static int swap_read_page(struct swap_map_handle *handle, void *buf, |
921 | struct bio **bio_chain) | |
61159a31 | 922 | { |
3aef83e0 | 923 | sector_t offset; |
61159a31 | 924 | int error; |
081a9d04 | 925 | struct swap_map_page_list *tmp; |
61159a31 RW |
926 | |
927 | if (!handle->cur) | |
928 | return -EINVAL; | |
929 | offset = handle->cur->entries[handle->k]; | |
930 | if (!offset) | |
931 | return -EFAULT; | |
8a0d613f | 932 | error = hib_bio_read_page(offset, buf, bio_chain); |
61159a31 RW |
933 | if (error) |
934 | return error; | |
935 | if (++handle->k >= MAP_PAGE_ENTRIES) { | |
936 | handle->k = 0; | |
081a9d04 BS |
937 | free_page((unsigned long)handle->maps->map); |
938 | tmp = handle->maps; | |
939 | handle->maps = handle->maps->next; | |
940 | kfree(tmp); | |
941 | if (!handle->maps) | |
61159a31 | 942 | release_swap_reader(handle); |
081a9d04 BS |
943 | else |
944 | handle->cur = handle->maps->map; | |
61159a31 RW |
945 | } |
946 | return error; | |
947 | } | |
948 | ||
6f612af5 JS |
949 | static int swap_reader_finish(struct swap_map_handle *handle) |
950 | { | |
951 | release_swap_reader(handle); | |
952 | ||
953 | return 0; | |
954 | } | |
955 | ||
61159a31 RW |
956 | /** |
957 | * load_image - load the image using the swap map handle | |
958 | * @handle and the snapshot handle @snapshot | |
959 | * (assume there are @nr_pages pages to load) | |
960 | */ | |
961 | ||
962 | static int load_image(struct swap_map_handle *handle, | |
963 | struct snapshot_handle *snapshot, | |
546e0d27 | 964 | unsigned int nr_to_read) |
61159a31 RW |
965 | { |
966 | unsigned int m; | |
081a9d04 | 967 | int ret = 0; |
8c002494 AM |
968 | struct timeval start; |
969 | struct timeval stop; | |
546e0d27 AM |
970 | struct bio *bio; |
971 | int err2; | |
972 | unsigned nr_pages; | |
61159a31 | 973 | |
d8150d35 | 974 | printk(KERN_INFO "PM: Loading image data pages (%u pages)...\n", |
23976728 | 975 | nr_to_read); |
d8150d35 | 976 | m = nr_to_read / 10; |
61159a31 RW |
977 | if (!m) |
978 | m = 1; | |
979 | nr_pages = 0; | |
546e0d27 | 980 | bio = NULL; |
8c002494 | 981 | do_gettimeofday(&start); |
546e0d27 | 982 | for ( ; ; ) { |
081a9d04 BS |
983 | ret = snapshot_write_next(snapshot); |
984 | if (ret <= 0) | |
546e0d27 | 985 | break; |
081a9d04 BS |
986 | ret = swap_read_page(handle, data_of(*snapshot), &bio); |
987 | if (ret) | |
546e0d27 AM |
988 | break; |
989 | if (snapshot->sync_read) | |
081a9d04 BS |
990 | ret = hib_wait_on_bio_chain(&bio); |
991 | if (ret) | |
546e0d27 AM |
992 | break; |
993 | if (!(nr_pages % m)) | |
d8150d35 BS |
994 | printk(KERN_INFO "PM: Image loading progress: %3d%%\n", |
995 | nr_pages / m * 10); | |
546e0d27 AM |
996 | nr_pages++; |
997 | } | |
8a0d613f | 998 | err2 = hib_wait_on_bio_chain(&bio); |
8c002494 | 999 | do_gettimeofday(&stop); |
081a9d04 BS |
1000 | if (!ret) |
1001 | ret = err2; | |
1002 | if (!ret) { | |
d8150d35 | 1003 | printk(KERN_INFO "PM: Image loading done.\n"); |
8357376d | 1004 | snapshot_write_finalize(snapshot); |
e655a250 | 1005 | if (!snapshot_image_loaded(snapshot)) |
081a9d04 | 1006 | ret = -ENODATA; |
d8150d35 | 1007 | } |
0d3a9abe | 1008 | swsusp_show_speed(&start, &stop, nr_to_read, "Read"); |
081a9d04 BS |
1009 | return ret; |
1010 | } | |
1011 | ||
1012 | /** | |
1013 | * Structure used for LZO data decompression. | |
1014 | */ | |
1015 | struct dec_data { | |
1016 | struct task_struct *thr; /* thread */ | |
1017 | atomic_t ready; /* ready to start flag */ | |
1018 | atomic_t stop; /* ready to stop flag */ | |
1019 | int ret; /* return code */ | |
1020 | wait_queue_head_t go; /* start decompression */ | |
1021 | wait_queue_head_t done; /* decompression done */ | |
1022 | size_t unc_len; /* uncompressed length */ | |
1023 | size_t cmp_len; /* compressed length */ | |
1024 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ | |
1025 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ | |
1026 | }; | |
1027 | ||
1028 | /** | |
1029 | * Deompression function that runs in its own thread. | |
1030 | */ | |
1031 | static int lzo_decompress_threadfn(void *data) | |
1032 | { | |
1033 | struct dec_data *d = data; | |
1034 | ||
1035 | while (1) { | |
1036 | wait_event(d->go, atomic_read(&d->ready) || | |
1037 | kthread_should_stop()); | |
1038 | if (kthread_should_stop()) { | |
1039 | d->thr = NULL; | |
1040 | d->ret = -1; | |
1041 | atomic_set(&d->stop, 1); | |
1042 | wake_up(&d->done); | |
1043 | break; | |
1044 | } | |
1045 | atomic_set(&d->ready, 0); | |
1046 | ||
1047 | d->unc_len = LZO_UNC_SIZE; | |
1048 | d->ret = lzo1x_decompress_safe(d->cmp + LZO_HEADER, d->cmp_len, | |
1049 | d->unc, &d->unc_len); | |
1050 | atomic_set(&d->stop, 1); | |
1051 | wake_up(&d->done); | |
1052 | } | |
1053 | return 0; | |
61159a31 RW |
1054 | } |
1055 | ||
f996fc96 BS |
1056 | /** |
1057 | * load_image_lzo - Load compressed image data and decompress them with LZO. | |
1058 | * @handle: Swap map handle to use for loading data. | |
1059 | * @snapshot: Image to copy uncompressed data into. | |
1060 | * @nr_to_read: Number of pages to load. | |
1061 | */ | |
1062 | static int load_image_lzo(struct swap_map_handle *handle, | |
1063 | struct snapshot_handle *snapshot, | |
1064 | unsigned int nr_to_read) | |
1065 | { | |
1066 | unsigned int m; | |
081a9d04 BS |
1067 | int ret = 0; |
1068 | int eof = 0; | |
9f339caf | 1069 | struct bio *bio; |
f996fc96 BS |
1070 | struct timeval start; |
1071 | struct timeval stop; | |
1072 | unsigned nr_pages; | |
081a9d04 BS |
1073 | size_t off; |
1074 | unsigned i, thr, run_threads, nr_threads; | |
1075 | unsigned ring = 0, pg = 0, ring_size = 0, | |
1076 | have = 0, want, need, asked = 0; | |
5a21d489 | 1077 | unsigned long read_pages = 0; |
081a9d04 BS |
1078 | unsigned char **page = NULL; |
1079 | struct dec_data *data = NULL; | |
1080 | struct crc_data *crc = NULL; | |
1081 | ||
1082 | /* | |
1083 | * We'll limit the number of threads for decompression to limit memory | |
1084 | * footprint. | |
1085 | */ | |
1086 | nr_threads = num_online_cpus() - 1; | |
1087 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); | |
1088 | ||
5a21d489 | 1089 | page = vmalloc(sizeof(*page) * LZO_MAX_RD_PAGES); |
081a9d04 BS |
1090 | if (!page) { |
1091 | printk(KERN_ERR "PM: Failed to allocate LZO page\n"); | |
1092 | ret = -ENOMEM; | |
1093 | goto out_clean; | |
1094 | } | |
9f339caf | 1095 | |
081a9d04 BS |
1096 | data = vmalloc(sizeof(*data) * nr_threads); |
1097 | if (!data) { | |
1098 | printk(KERN_ERR "PM: Failed to allocate LZO data\n"); | |
1099 | ret = -ENOMEM; | |
1100 | goto out_clean; | |
1101 | } | |
1102 | for (thr = 0; thr < nr_threads; thr++) | |
1103 | memset(&data[thr], 0, offsetof(struct dec_data, go)); | |
9f339caf | 1104 | |
081a9d04 BS |
1105 | crc = kmalloc(sizeof(*crc), GFP_KERNEL); |
1106 | if (!crc) { | |
1107 | printk(KERN_ERR "PM: Failed to allocate crc\n"); | |
1108 | ret = -ENOMEM; | |
1109 | goto out_clean; | |
1110 | } | |
1111 | memset(crc, 0, offsetof(struct crc_data, go)); | |
1112 | ||
1113 | /* | |
1114 | * Start the decompression threads. | |
1115 | */ | |
1116 | for (thr = 0; thr < nr_threads; thr++) { | |
1117 | init_waitqueue_head(&data[thr].go); | |
1118 | init_waitqueue_head(&data[thr].done); | |
1119 | ||
1120 | data[thr].thr = kthread_run(lzo_decompress_threadfn, | |
1121 | &data[thr], | |
1122 | "image_decompress/%u", thr); | |
1123 | if (IS_ERR(data[thr].thr)) { | |
1124 | data[thr].thr = NULL; | |
1125 | printk(KERN_ERR | |
1126 | "PM: Cannot start decompression threads\n"); | |
1127 | ret = -ENOMEM; | |
1128 | goto out_clean; | |
9f339caf | 1129 | } |
f996fc96 BS |
1130 | } |
1131 | ||
081a9d04 BS |
1132 | /* |
1133 | * Start the CRC32 thread. | |
1134 | */ | |
1135 | init_waitqueue_head(&crc->go); | |
1136 | init_waitqueue_head(&crc->done); | |
1137 | ||
1138 | handle->crc32 = 0; | |
1139 | crc->crc32 = &handle->crc32; | |
1140 | for (thr = 0; thr < nr_threads; thr++) { | |
1141 | crc->unc[thr] = data[thr].unc; | |
1142 | crc->unc_len[thr] = &data[thr].unc_len; | |
f996fc96 BS |
1143 | } |
1144 | ||
081a9d04 BS |
1145 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); |
1146 | if (IS_ERR(crc->thr)) { | |
1147 | crc->thr = NULL; | |
1148 | printk(KERN_ERR "PM: Cannot start CRC32 thread\n"); | |
1149 | ret = -ENOMEM; | |
1150 | goto out_clean; | |
1151 | } | |
9f339caf | 1152 | |
081a9d04 | 1153 | /* |
5a21d489 BS |
1154 | * Set the number of pages for read buffering. |
1155 | * This is complete guesswork, because we'll only know the real | |
1156 | * picture once prepare_image() is called, which is much later on | |
1157 | * during the image load phase. We'll assume the worst case and | |
1158 | * say that none of the image pages are from high memory. | |
081a9d04 | 1159 | */ |
5a21d489 BS |
1160 | if (low_free_pages() > snapshot_get_image_size()) |
1161 | read_pages = (low_free_pages() - snapshot_get_image_size()) / 2; | |
1162 | read_pages = clamp_val(read_pages, LZO_MIN_RD_PAGES, LZO_MAX_RD_PAGES); | |
9f339caf | 1163 | |
081a9d04 BS |
1164 | for (i = 0; i < read_pages; i++) { |
1165 | page[i] = (void *)__get_free_page(i < LZO_CMP_PAGES ? | |
1166 | __GFP_WAIT | __GFP_HIGH : | |
5a21d489 BS |
1167 | __GFP_WAIT | __GFP_NOWARN | |
1168 | __GFP_NORETRY); | |
1169 | ||
081a9d04 BS |
1170 | if (!page[i]) { |
1171 | if (i < LZO_CMP_PAGES) { | |
1172 | ring_size = i; | |
1173 | printk(KERN_ERR | |
1174 | "PM: Failed to allocate LZO pages\n"); | |
1175 | ret = -ENOMEM; | |
1176 | goto out_clean; | |
1177 | } else { | |
1178 | break; | |
1179 | } | |
1180 | } | |
f996fc96 | 1181 | } |
081a9d04 | 1182 | want = ring_size = i; |
f996fc96 BS |
1183 | |
1184 | printk(KERN_INFO | |
081a9d04 | 1185 | "PM: Using %u thread(s) for decompression.\n" |
d8150d35 | 1186 | "PM: Loading and decompressing image data (%u pages)...\n", |
081a9d04 | 1187 | nr_threads, nr_to_read); |
d8150d35 | 1188 | m = nr_to_read / 10; |
f996fc96 BS |
1189 | if (!m) |
1190 | m = 1; | |
1191 | nr_pages = 0; | |
9f339caf | 1192 | bio = NULL; |
f996fc96 BS |
1193 | do_gettimeofday(&start); |
1194 | ||
081a9d04 BS |
1195 | ret = snapshot_write_next(snapshot); |
1196 | if (ret <= 0) | |
f996fc96 BS |
1197 | goto out_finish; |
1198 | ||
081a9d04 BS |
1199 | for(;;) { |
1200 | for (i = 0; !eof && i < want; i++) { | |
1201 | ret = swap_read_page(handle, page[ring], &bio); | |
1202 | if (ret) { | |
1203 | /* | |
1204 | * On real read error, finish. On end of data, | |
1205 | * set EOF flag and just exit the read loop. | |
1206 | */ | |
1207 | if (handle->cur && | |
1208 | handle->cur->entries[handle->k]) { | |
1209 | goto out_finish; | |
1210 | } else { | |
1211 | eof = 1; | |
1212 | break; | |
1213 | } | |
1214 | } | |
1215 | if (++ring >= ring_size) | |
1216 | ring = 0; | |
f996fc96 | 1217 | } |
081a9d04 BS |
1218 | asked += i; |
1219 | want -= i; | |
f996fc96 | 1220 | |
081a9d04 BS |
1221 | /* |
1222 | * We are out of data, wait for some more. | |
1223 | */ | |
1224 | if (!have) { | |
1225 | if (!asked) | |
1226 | break; | |
1227 | ||
1228 | ret = hib_wait_on_bio_chain(&bio); | |
1229 | if (ret) | |
f996fc96 | 1230 | goto out_finish; |
081a9d04 BS |
1231 | have += asked; |
1232 | asked = 0; | |
1233 | if (eof) | |
1234 | eof = 2; | |
9f339caf | 1235 | } |
f996fc96 | 1236 | |
081a9d04 BS |
1237 | if (crc->run_threads) { |
1238 | wait_event(crc->done, atomic_read(&crc->stop)); | |
1239 | atomic_set(&crc->stop, 0); | |
1240 | crc->run_threads = 0; | |
f996fc96 BS |
1241 | } |
1242 | ||
081a9d04 BS |
1243 | for (thr = 0; have && thr < nr_threads; thr++) { |
1244 | data[thr].cmp_len = *(size_t *)page[pg]; | |
1245 | if (unlikely(!data[thr].cmp_len || | |
1246 | data[thr].cmp_len > | |
1247 | lzo1x_worst_compress(LZO_UNC_SIZE))) { | |
1248 | printk(KERN_ERR | |
1249 | "PM: Invalid LZO compressed length\n"); | |
1250 | ret = -1; | |
1251 | goto out_finish; | |
1252 | } | |
1253 | ||
1254 | need = DIV_ROUND_UP(data[thr].cmp_len + LZO_HEADER, | |
1255 | PAGE_SIZE); | |
1256 | if (need > have) { | |
1257 | if (eof > 1) { | |
1258 | ret = -1; | |
1259 | goto out_finish; | |
1260 | } | |
1261 | break; | |
1262 | } | |
1263 | ||
1264 | for (off = 0; | |
1265 | off < LZO_HEADER + data[thr].cmp_len; | |
1266 | off += PAGE_SIZE) { | |
1267 | memcpy(data[thr].cmp + off, | |
1268 | page[pg], PAGE_SIZE); | |
1269 | have--; | |
1270 | want++; | |
1271 | if (++pg >= ring_size) | |
1272 | pg = 0; | |
1273 | } | |
1274 | ||
1275 | atomic_set(&data[thr].ready, 1); | |
1276 | wake_up(&data[thr].go); | |
f996fc96 BS |
1277 | } |
1278 | ||
081a9d04 BS |
1279 | /* |
1280 | * Wait for more data while we are decompressing. | |
1281 | */ | |
1282 | if (have < LZO_CMP_PAGES && asked) { | |
1283 | ret = hib_wait_on_bio_chain(&bio); | |
1284 | if (ret) | |
1285 | goto out_finish; | |
1286 | have += asked; | |
1287 | asked = 0; | |
1288 | if (eof) | |
1289 | eof = 2; | |
f996fc96 BS |
1290 | } |
1291 | ||
081a9d04 BS |
1292 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
1293 | wait_event(data[thr].done, | |
1294 | atomic_read(&data[thr].stop)); | |
1295 | atomic_set(&data[thr].stop, 0); | |
1296 | ||
1297 | ret = data[thr].ret; | |
f996fc96 | 1298 | |
081a9d04 BS |
1299 | if (ret < 0) { |
1300 | printk(KERN_ERR | |
1301 | "PM: LZO decompression failed\n"); | |
1302 | goto out_finish; | |
1303 | } | |
f996fc96 | 1304 | |
081a9d04 BS |
1305 | if (unlikely(!data[thr].unc_len || |
1306 | data[thr].unc_len > LZO_UNC_SIZE || | |
1307 | data[thr].unc_len & (PAGE_SIZE - 1))) { | |
1308 | printk(KERN_ERR | |
1309 | "PM: Invalid LZO uncompressed length\n"); | |
1310 | ret = -1; | |
f996fc96 | 1311 | goto out_finish; |
081a9d04 BS |
1312 | } |
1313 | ||
1314 | for (off = 0; | |
1315 | off < data[thr].unc_len; off += PAGE_SIZE) { | |
1316 | memcpy(data_of(*snapshot), | |
1317 | data[thr].unc + off, PAGE_SIZE); | |
1318 | ||
1319 | if (!(nr_pages % m)) | |
d8150d35 BS |
1320 | printk(KERN_INFO |
1321 | "PM: Image loading progress: " | |
1322 | "%3d%%\n", | |
1323 | nr_pages / m * 10); | |
081a9d04 BS |
1324 | nr_pages++; |
1325 | ||
1326 | ret = snapshot_write_next(snapshot); | |
1327 | if (ret <= 0) { | |
1328 | crc->run_threads = thr + 1; | |
1329 | atomic_set(&crc->ready, 1); | |
1330 | wake_up(&crc->go); | |
1331 | goto out_finish; | |
1332 | } | |
1333 | } | |
f996fc96 | 1334 | } |
081a9d04 BS |
1335 | |
1336 | crc->run_threads = thr; | |
1337 | atomic_set(&crc->ready, 1); | |
1338 | wake_up(&crc->go); | |
f996fc96 BS |
1339 | } |
1340 | ||
1341 | out_finish: | |
081a9d04 BS |
1342 | if (crc->run_threads) { |
1343 | wait_event(crc->done, atomic_read(&crc->stop)); | |
1344 | atomic_set(&crc->stop, 0); | |
1345 | } | |
f996fc96 | 1346 | do_gettimeofday(&stop); |
081a9d04 | 1347 | if (!ret) { |
d8150d35 | 1348 | printk(KERN_INFO "PM: Image loading done.\n"); |
f996fc96 BS |
1349 | snapshot_write_finalize(snapshot); |
1350 | if (!snapshot_image_loaded(snapshot)) | |
081a9d04 BS |
1351 | ret = -ENODATA; |
1352 | if (!ret) { | |
1353 | if (swsusp_header->flags & SF_CRC32_MODE) { | |
1354 | if(handle->crc32 != swsusp_header->crc32) { | |
1355 | printk(KERN_ERR | |
1356 | "PM: Invalid image CRC32!\n"); | |
1357 | ret = -ENODATA; | |
1358 | } | |
1359 | } | |
1360 | } | |
d8150d35 | 1361 | } |
f996fc96 | 1362 | swsusp_show_speed(&start, &stop, nr_to_read, "Read"); |
081a9d04 BS |
1363 | out_clean: |
1364 | for (i = 0; i < ring_size; i++) | |
9f339caf | 1365 | free_page((unsigned long)page[i]); |
081a9d04 BS |
1366 | if (crc) { |
1367 | if (crc->thr) | |
1368 | kthread_stop(crc->thr); | |
1369 | kfree(crc); | |
1370 | } | |
1371 | if (data) { | |
1372 | for (thr = 0; thr < nr_threads; thr++) | |
1373 | if (data[thr].thr) | |
1374 | kthread_stop(data[thr].thr); | |
1375 | vfree(data); | |
1376 | } | |
1377 | if (page) vfree(page); | |
f996fc96 | 1378 | |
081a9d04 | 1379 | return ret; |
f996fc96 BS |
1380 | } |
1381 | ||
a634cc10 RW |
1382 | /** |
1383 | * swsusp_read - read the hibernation image. | |
1384 | * @flags_p: flags passed by the "frozen" kernel in the image header should | |
b595076a | 1385 | * be written into this memory location |
a634cc10 RW |
1386 | */ |
1387 | ||
1388 | int swsusp_read(unsigned int *flags_p) | |
61159a31 RW |
1389 | { |
1390 | int error; | |
1391 | struct swap_map_handle handle; | |
1392 | struct snapshot_handle snapshot; | |
1393 | struct swsusp_info *header; | |
1394 | ||
61159a31 | 1395 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 1396 | error = snapshot_write_next(&snapshot); |
61159a31 RW |
1397 | if (error < PAGE_SIZE) |
1398 | return error < 0 ? error : -EFAULT; | |
1399 | header = (struct swsusp_info *)data_of(snapshot); | |
6f612af5 JS |
1400 | error = get_swap_reader(&handle, flags_p); |
1401 | if (error) | |
1402 | goto end; | |
61159a31 | 1403 | if (!error) |
546e0d27 | 1404 | error = swap_read_page(&handle, header, NULL); |
f996fc96 BS |
1405 | if (!error) { |
1406 | error = (*flags_p & SF_NOCOMPRESS_MODE) ? | |
1407 | load_image(&handle, &snapshot, header->pages - 1) : | |
1408 | load_image_lzo(&handle, &snapshot, header->pages - 1); | |
1409 | } | |
6f612af5 JS |
1410 | swap_reader_finish(&handle); |
1411 | end: | |
61159a31 | 1412 | if (!error) |
23976728 | 1413 | pr_debug("PM: Image successfully loaded\n"); |
61159a31 | 1414 | else |
23976728 | 1415 | pr_debug("PM: Error %d resuming\n", error); |
61159a31 RW |
1416 | return error; |
1417 | } | |
1418 | ||
1419 | /** | |
1420 | * swsusp_check - Check for swsusp signature in the resume device | |
1421 | */ | |
1422 | ||
1423 | int swsusp_check(void) | |
1424 | { | |
1425 | int error; | |
1426 | ||
d4d77629 TH |
1427 | hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device, |
1428 | FMODE_READ, NULL); | |
8a0d613f JS |
1429 | if (!IS_ERR(hib_resume_bdev)) { |
1430 | set_blocksize(hib_resume_bdev, PAGE_SIZE); | |
3ecb01df | 1431 | clear_page(swsusp_header); |
8a0d613f | 1432 | error = hib_bio_read_page(swsusp_resume_block, |
1b29c164 | 1433 | swsusp_header, NULL); |
9a154d9d | 1434 | if (error) |
76b57e61 | 1435 | goto put; |
9a154d9d | 1436 | |
3624eb04 | 1437 | if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) { |
1b29c164 | 1438 | memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10); |
61159a31 | 1439 | /* Reset swap signature now */ |
8a0d613f | 1440 | error = hib_bio_write_page(swsusp_resume_block, |
1b29c164 | 1441 | swsusp_header, NULL); |
61159a31 | 1442 | } else { |
76b57e61 | 1443 | error = -EINVAL; |
61159a31 | 1444 | } |
76b57e61 JS |
1445 | |
1446 | put: | |
61159a31 | 1447 | if (error) |
8a0d613f | 1448 | blkdev_put(hib_resume_bdev, FMODE_READ); |
61159a31 | 1449 | else |
d0941ead | 1450 | pr_debug("PM: Image signature found, resuming\n"); |
61159a31 | 1451 | } else { |
8a0d613f | 1452 | error = PTR_ERR(hib_resume_bdev); |
61159a31 RW |
1453 | } |
1454 | ||
1455 | if (error) | |
d0941ead | 1456 | pr_debug("PM: Image not found (code %d)\n", error); |
61159a31 RW |
1457 | |
1458 | return error; | |
1459 | } | |
1460 | ||
1461 | /** | |
1462 | * swsusp_close - close swap device. | |
1463 | */ | |
1464 | ||
c2dd0dae | 1465 | void swsusp_close(fmode_t mode) |
61159a31 | 1466 | { |
8a0d613f | 1467 | if (IS_ERR(hib_resume_bdev)) { |
23976728 | 1468 | pr_debug("PM: Image device not initialised\n"); |
61159a31 RW |
1469 | return; |
1470 | } | |
1471 | ||
8a0d613f | 1472 | blkdev_put(hib_resume_bdev, mode); |
61159a31 | 1473 | } |
1b29c164 | 1474 | |
62c552cc BS |
1475 | /** |
1476 | * swsusp_unmark - Unmark swsusp signature in the resume device | |
1477 | */ | |
1478 | ||
1479 | #ifdef CONFIG_SUSPEND | |
1480 | int swsusp_unmark(void) | |
1481 | { | |
1482 | int error; | |
1483 | ||
1484 | hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL); | |
1485 | if (!memcmp(HIBERNATE_SIG,swsusp_header->sig, 10)) { | |
1486 | memcpy(swsusp_header->sig,swsusp_header->orig_sig, 10); | |
1487 | error = hib_bio_write_page(swsusp_resume_block, | |
1488 | swsusp_header, NULL); | |
1489 | } else { | |
1490 | printk(KERN_ERR "PM: Cannot find swsusp signature!\n"); | |
1491 | error = -ENODEV; | |
1492 | } | |
1493 | ||
1494 | /* | |
1495 | * We just returned from suspend, we don't need the image any more. | |
1496 | */ | |
1497 | free_all_swap_pages(root_swap); | |
1498 | ||
1499 | return error; | |
1500 | } | |
1501 | #endif | |
1502 | ||
1b29c164 VG |
1503 | static int swsusp_header_init(void) |
1504 | { | |
1505 | swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL); | |
1506 | if (!swsusp_header) | |
1507 | panic("Could not allocate memory for swsusp_header\n"); | |
1508 | return 0; | |
1509 | } | |
1510 | ||
1511 | core_initcall(swsusp_header_init); |