2 * linux/kernel/power/swap.c
4 * This file provides functions for reading the suspend image from
5 * and writing it to a swap partition.
7 * Copyright (C) 1998,2001-2005 Pavel Machek <pavel@ucw.cz>
8 * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
9 * Copyright (C) 2010 Bojan Smojver <bojan@rexursive.com>
11 * This file is released under the GPLv2.
15 #include <linux/module.h>
16 #include <linux/file.h>
17 #include <linux/delay.h>
18 #include <linux/bitops.h>
19 #include <linux/genhd.h>
20 #include <linux/device.h>
21 #include <linux/bio.h>
22 #include <linux/blkdev.h>
23 #include <linux/swap.h>
24 #include <linux/swapops.h>
26 #include <linux/slab.h>
27 #include <linux/lzo.h>
28 #include <linux/vmalloc.h>
29 #include <linux/cpumask.h>
30 #include <linux/atomic.h>
31 #include <linux/kthread.h>
32 #include <linux/crc32.h>
36 #define HIBERNATE_SIG "S1SUSPEND"
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
41 * structures that contain each an array of MAP_PAGE_ENTRIES swap entries.
42 * These structures are stored on the swap and linked together with the
43 * help of the .next_swap member.
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.
49 * During resume we pick up all swap_map_page structures into a list.
52 #define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1)
55 * Number of free pages that are not high.
57 static inline unsigned long low_free_pages(void)
59 return nr_free_pages() - nr_free_highpages();
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.
66 static inline unsigned long reqd_free_pages(void)
68 return low_free_pages() / 2;
71 struct swap_map_page {
72 sector_t entries[MAP_PAGE_ENTRIES];
76 struct swap_map_page_list {
77 struct swap_map_page *map;
78 struct swap_map_page_list *next;
82 * The swap_map_handle structure is used for handling swap in
86 struct swap_map_handle {
87 struct swap_map_page *cur;
88 struct swap_map_page_list *maps;
90 sector_t first_sector;
92 unsigned long reqd_free_pages;
96 struct swsusp_header {
97 char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int) -
101 unsigned int flags; /* Flags to pass to the "boot" kernel */
104 } __attribute__((packed));
106 static struct swsusp_header *swsusp_header;
109 * The following functions are used for tracing the allocated
110 * swap pages, so that they can be freed in case of an error.
113 struct swsusp_extent {
119 static struct rb_root swsusp_extents = RB_ROOT;
121 static int swsusp_extents_insert(unsigned long swap_offset)
123 struct rb_node **new = &(swsusp_extents.rb_node);
124 struct rb_node *parent = NULL;
125 struct swsusp_extent *ext;
127 /* Figure out where to put the new node */
129 ext = container_of(*new, struct swsusp_extent, node);
131 if (swap_offset < ext->start) {
133 if (swap_offset == ext->start - 1) {
137 new = &((*new)->rb_left);
138 } else if (swap_offset > ext->end) {
140 if (swap_offset == ext->end + 1) {
144 new = &((*new)->rb_right);
146 /* It already is in the tree */
150 /* Add the new node and rebalance the tree. */
151 ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL);
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);
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.
167 sector_t alloc_swapdev_block(int swap)
169 unsigned long offset;
171 offset = swp_offset(get_swap_page_of_type(swap));
173 if (swsusp_extents_insert(offset))
174 swap_free(swp_entry(swap, offset));
176 return swapdev_block(swap, offset);
182 * free_all_swap_pages - free swap pages allocated for saving image data.
183 * It also frees the extents used to register which swap entries had been
187 void free_all_swap_pages(int swap)
189 struct rb_node *node;
191 while ((node = swsusp_extents.rb_node)) {
192 struct swsusp_extent *ext;
193 unsigned long offset;
195 ext = container_of(node, struct swsusp_extent, node);
196 rb_erase(node, &swsusp_extents);
197 for (offset = ext->start; offset <= ext->end; offset++)
198 swap_free(swp_entry(swap, offset));
204 int swsusp_swap_in_use(void)
206 return (swsusp_extents.rb_node != NULL);
213 static unsigned short root_swap = 0xffff;
214 struct block_device *hib_resume_bdev;
220 static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
224 hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL);
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);
228 memcpy(swsusp_header->sig, HIBERNATE_SIG, 10);
229 swsusp_header->image = handle->first_sector;
230 swsusp_header->flags = flags;
231 if (flags & SF_CRC32_MODE)
232 swsusp_header->crc32 = handle->crc32;
233 error = hib_bio_write_page(swsusp_resume_block,
234 swsusp_header, NULL);
236 printk(KERN_ERR "PM: Swap header not found!\n");
243 * swsusp_swap_check - check if the resume device is a swap device
244 * and get its index (if so)
246 * This is called before saving image
248 static int swsusp_swap_check(void)
252 res = swap_type_of(swsusp_resume_device, swsusp_resume_block,
258 res = blkdev_get(hib_resume_bdev, FMODE_WRITE, NULL);
262 res = set_blocksize(hib_resume_bdev, PAGE_SIZE);
264 blkdev_put(hib_resume_bdev, FMODE_WRITE);
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.
273 * @bio_chain: Link the next write BIO here
276 static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
285 src = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH);
289 ret = hib_wait_on_bio_chain(bio_chain); /* Free pages */
292 src = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH);
297 bio_chain = NULL; /* Go synchronous */
304 return hib_bio_write_page(offset, src, bio_chain);
307 static void release_swap_writer(struct swap_map_handle *handle)
310 free_page((unsigned long)handle->cur);
314 static int get_swap_writer(struct swap_map_handle *handle)
318 ret = swsusp_swap_check();
321 printk(KERN_ERR "PM: Cannot find swap device, try "
325 handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL);
330 handle->cur_swap = alloc_swapdev_block(root_swap);
331 if (!handle->cur_swap) {
336 handle->reqd_free_pages = reqd_free_pages();
337 handle->first_sector = handle->cur_swap;
340 release_swap_writer(handle);
342 swsusp_close(FMODE_WRITE);
346 static int swap_write_page(struct swap_map_handle *handle, void *buf,
347 struct bio **bio_chain)
354 offset = alloc_swapdev_block(root_swap);
355 error = write_page(buf, offset, bio_chain);
358 handle->cur->entries[handle->k++] = offset;
359 if (handle->k >= MAP_PAGE_ENTRIES) {
360 offset = alloc_swapdev_block(root_swap);
363 handle->cur->next_swap = offset;
364 error = write_page(handle->cur, handle->cur_swap, bio_chain);
367 clear_page(handle->cur);
368 handle->cur_swap = offset;
371 if (bio_chain && low_free_pages() <= handle->reqd_free_pages) {
372 error = hib_wait_on_bio_chain(bio_chain);
375 handle->reqd_free_pages = reqd_free_pages();
381 static int flush_swap_writer(struct swap_map_handle *handle)
383 if (handle->cur && handle->cur_swap)
384 return write_page(handle->cur, handle->cur_swap, NULL);
389 static int swap_writer_finish(struct swap_map_handle *handle,
390 unsigned int flags, int error)
393 flush_swap_writer(handle);
394 printk(KERN_INFO "PM: S");
395 error = mark_swapfiles(handle, flags);
400 free_all_swap_pages(root_swap);
401 release_swap_writer(handle);
402 swsusp_close(FMODE_WRITE);
407 /* We need to remember how much compressed data we need to read. */
408 #define LZO_HEADER sizeof(size_t)
410 /* Number of pages/bytes we'll compress at one time. */
411 #define LZO_UNC_PAGES 32
412 #define LZO_UNC_SIZE (LZO_UNC_PAGES * PAGE_SIZE)
414 /* Number of pages/bytes we need for compressed data (worst case). */
415 #define LZO_CMP_PAGES DIV_ROUND_UP(lzo1x_worst_compress(LZO_UNC_SIZE) + \
416 LZO_HEADER, PAGE_SIZE)
417 #define LZO_CMP_SIZE (LZO_CMP_PAGES * PAGE_SIZE)
419 /* Maximum number of threads for compression/decompression. */
420 #define LZO_THREADS 3
422 /* Maximum number of pages for read buffering. */
423 #define LZO_READ_PAGES (MAP_PAGE_ENTRIES * 8)
427 * save_image - save the suspend image data
430 static int save_image(struct swap_map_handle *handle,
431 struct snapshot_handle *snapshot,
432 unsigned int nr_to_write)
439 struct timeval start;
442 printk(KERN_INFO "PM: Saving image data pages (%u pages) ... ",
444 m = nr_to_write / 100;
449 do_gettimeofday(&start);
451 ret = snapshot_read_next(snapshot);
454 ret = swap_write_page(handle, data_of(*snapshot), &bio);
458 printk(KERN_CONT "\b\b\b\b%3d%%", nr_pages / m);
461 err2 = hib_wait_on_bio_chain(&bio);
462 do_gettimeofday(&stop);
466 printk(KERN_CONT "\b\b\b\bdone\n");
468 printk(KERN_CONT "\n");
469 swsusp_show_speed(&start, &stop, nr_to_write, "Wrote");
474 * Structure used for CRC32.
477 struct task_struct *thr; /* thread */
478 atomic_t ready; /* ready to start flag */
479 atomic_t stop; /* ready to stop flag */
480 unsigned run_threads; /* nr current threads */
481 wait_queue_head_t go; /* start crc update */
482 wait_queue_head_t done; /* crc update done */
483 u32 *crc32; /* points to handle's crc32 */
484 size_t *unc_len[LZO_THREADS]; /* uncompressed lengths */
485 unsigned char *unc[LZO_THREADS]; /* uncompressed data */
489 * CRC32 update function that runs in its own thread.
491 static int crc32_threadfn(void *data)
493 struct crc_data *d = data;
497 wait_event(d->go, atomic_read(&d->ready) ||
498 kthread_should_stop());
499 if (kthread_should_stop()) {
501 atomic_set(&d->stop, 1);
505 atomic_set(&d->ready, 0);
507 for (i = 0; i < d->run_threads; i++)
508 *d->crc32 = crc32_le(*d->crc32,
509 d->unc[i], *d->unc_len[i]);
510 atomic_set(&d->stop, 1);
516 * Structure used for LZO data compression.
519 struct task_struct *thr; /* thread */
520 atomic_t ready; /* ready to start flag */
521 atomic_t stop; /* ready to stop flag */
522 int ret; /* return code */
523 wait_queue_head_t go; /* start compression */
524 wait_queue_head_t done; /* compression done */
525 size_t unc_len; /* uncompressed length */
526 size_t cmp_len; /* compressed length */
527 unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */
528 unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */
529 unsigned char wrk[LZO1X_1_MEM_COMPRESS]; /* compression workspace */
533 * Compression function that runs in its own thread.
535 static int lzo_compress_threadfn(void *data)
537 struct cmp_data *d = data;
540 wait_event(d->go, atomic_read(&d->ready) ||
541 kthread_should_stop());
542 if (kthread_should_stop()) {
545 atomic_set(&d->stop, 1);
549 atomic_set(&d->ready, 0);
551 d->ret = lzo1x_1_compress(d->unc, d->unc_len,
552 d->cmp + LZO_HEADER, &d->cmp_len,
554 atomic_set(&d->stop, 1);
561 * save_image_lzo - Save the suspend image data compressed with LZO.
562 * @handle: Swap mam handle to use for saving the image.
563 * @snapshot: Image to read data from.
564 * @nr_to_write: Number of pages to save.
566 static int save_image_lzo(struct swap_map_handle *handle,
567 struct snapshot_handle *snapshot,
568 unsigned int nr_to_write)
575 struct timeval start;
578 unsigned thr, run_threads, nr_threads;
579 unsigned char *page = NULL;
580 struct cmp_data *data = NULL;
581 struct crc_data *crc = NULL;
584 * We'll limit the number of threads for compression to limit memory
587 nr_threads = num_online_cpus() - 1;
588 nr_threads = clamp_val(nr_threads, 1, LZO_THREADS);
590 page = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH);
592 printk(KERN_ERR "PM: Failed to allocate LZO page\n");
597 data = vmalloc(sizeof(*data) * nr_threads);
599 printk(KERN_ERR "PM: Failed to allocate LZO data\n");
603 for (thr = 0; thr < nr_threads; thr++)
604 memset(&data[thr], 0, offsetof(struct cmp_data, go));
606 crc = kmalloc(sizeof(*crc), GFP_KERNEL);
608 printk(KERN_ERR "PM: Failed to allocate crc\n");
612 memset(crc, 0, offsetof(struct crc_data, go));
615 * Start the compression threads.
617 for (thr = 0; thr < nr_threads; thr++) {
618 init_waitqueue_head(&data[thr].go);
619 init_waitqueue_head(&data[thr].done);
621 data[thr].thr = kthread_run(lzo_compress_threadfn,
623 "image_compress/%u", thr);
624 if (IS_ERR(data[thr].thr)) {
625 data[thr].thr = NULL;
627 "PM: Cannot start compression threads\n");
634 * Adjust number of free pages after all allocations have been done.
635 * We don't want to run out of pages when writing.
637 handle->reqd_free_pages = reqd_free_pages();
640 * Start the CRC32 thread.
642 init_waitqueue_head(&crc->go);
643 init_waitqueue_head(&crc->done);
646 crc->crc32 = &handle->crc32;
647 for (thr = 0; thr < nr_threads; thr++) {
648 crc->unc[thr] = data[thr].unc;
649 crc->unc_len[thr] = &data[thr].unc_len;
652 crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32");
653 if (IS_ERR(crc->thr)) {
655 printk(KERN_ERR "PM: Cannot start CRC32 thread\n");
661 "PM: Using %u thread(s) for compression.\n"
662 "PM: Compressing and saving image data (%u pages) ... ",
663 nr_threads, nr_to_write);
664 m = nr_to_write / 100;
669 do_gettimeofday(&start);
671 for (thr = 0; thr < nr_threads; thr++) {
672 for (off = 0; off < LZO_UNC_SIZE; off += PAGE_SIZE) {
673 ret = snapshot_read_next(snapshot);
680 memcpy(data[thr].unc + off,
681 data_of(*snapshot), PAGE_SIZE);
684 printk(KERN_CONT "\b\b\b\b%3d%%",
691 data[thr].unc_len = off;
693 atomic_set(&data[thr].ready, 1);
694 wake_up(&data[thr].go);
700 crc->run_threads = thr;
701 atomic_set(&crc->ready, 1);
704 for (run_threads = thr, thr = 0; thr < run_threads; thr++) {
705 wait_event(data[thr].done,
706 atomic_read(&data[thr].stop));
707 atomic_set(&data[thr].stop, 0);
712 printk(KERN_ERR "PM: LZO compression failed\n");
716 if (unlikely(!data[thr].cmp_len ||
718 lzo1x_worst_compress(data[thr].unc_len))) {
720 "PM: Invalid LZO compressed length\n");
725 *(size_t *)data[thr].cmp = data[thr].cmp_len;
728 * Given we are writing one page at a time to disk, we
729 * copy that much from the buffer, although the last
730 * bit will likely be smaller than full page. This is
731 * OK - we saved the length of the compressed data, so
732 * any garbage at the end will be discarded when we
736 off < LZO_HEADER + data[thr].cmp_len;
738 memcpy(page, data[thr].cmp + off, PAGE_SIZE);
740 ret = swap_write_page(handle, page, &bio);
746 wait_event(crc->done, atomic_read(&crc->stop));
747 atomic_set(&crc->stop, 0);
751 err2 = hib_wait_on_bio_chain(&bio);
752 do_gettimeofday(&stop);
756 printk(KERN_CONT "\b\b\b\bdone\n");
758 printk(KERN_CONT "\n");
760 swsusp_show_speed(&start, &stop, nr_to_write, "Wrote");
764 kthread_stop(crc->thr);
768 for (thr = 0; thr < nr_threads; thr++)
770 kthread_stop(data[thr].thr);
773 if (page) free_page((unsigned long)page);
779 * enough_swap - Make sure we have enough swap to save the image.
781 * Returns TRUE or FALSE after checking the total amount of swap
782 * space avaiable from the resume partition.
785 static int enough_swap(unsigned int nr_pages, unsigned int flags)
787 unsigned int free_swap = count_swap_pages(root_swap, 1);
788 unsigned int required;
790 pr_debug("PM: Free swap pages: %u\n", free_swap);
792 required = PAGES_FOR_IO + nr_pages;
793 return free_swap > required;
797 * swsusp_write - Write entire image and metadata.
798 * @flags: flags to pass to the "boot" kernel in the image header
800 * It is important _NOT_ to umount filesystems at this point. We want
801 * them synced (in case something goes wrong) but we DO not want to mark
802 * filesystem clean: it is not. (And it does not matter, if we resume
803 * correctly, we'll mark system clean, anyway.)
806 int swsusp_write(unsigned int flags)
808 struct swap_map_handle handle;
809 struct snapshot_handle snapshot;
810 struct swsusp_info *header;
814 pages = snapshot_get_image_size();
815 error = get_swap_writer(&handle);
817 printk(KERN_ERR "PM: Cannot get swap writer\n");
820 if (flags & SF_NOCOMPRESS_MODE) {
821 if (!enough_swap(pages, flags)) {
822 printk(KERN_ERR "PM: Not enough free swap\n");
827 memset(&snapshot, 0, sizeof(struct snapshot_handle));
828 error = snapshot_read_next(&snapshot);
829 if (error < PAGE_SIZE) {
835 header = (struct swsusp_info *)data_of(snapshot);
836 error = swap_write_page(&handle, header, NULL);
838 error = (flags & SF_NOCOMPRESS_MODE) ?
839 save_image(&handle, &snapshot, pages - 1) :
840 save_image_lzo(&handle, &snapshot, pages - 1);
843 error = swap_writer_finish(&handle, flags, error);
848 * The following functions allow us to read data using a swap map
849 * in a file-alike way
852 static void release_swap_reader(struct swap_map_handle *handle)
854 struct swap_map_page_list *tmp;
856 while (handle->maps) {
857 if (handle->maps->map)
858 free_page((unsigned long)handle->maps->map);
860 handle->maps = handle->maps->next;
866 static int get_swap_reader(struct swap_map_handle *handle,
867 unsigned int *flags_p)
870 struct swap_map_page_list *tmp, *last;
873 *flags_p = swsusp_header->flags;
875 if (!swsusp_header->image) /* how can this happen? */
879 last = handle->maps = NULL;
880 offset = swsusp_header->image;
882 tmp = kmalloc(sizeof(*handle->maps), GFP_KERNEL);
884 release_swap_reader(handle);
887 memset(tmp, 0, sizeof(*tmp));
894 tmp->map = (struct swap_map_page *)
895 __get_free_page(__GFP_WAIT | __GFP_HIGH);
897 release_swap_reader(handle);
901 error = hib_bio_read_page(offset, tmp->map, NULL);
903 release_swap_reader(handle);
906 offset = tmp->map->next_swap;
909 handle->cur = handle->maps->map;
913 static int swap_read_page(struct swap_map_handle *handle, void *buf,
914 struct bio **bio_chain)
918 struct swap_map_page_list *tmp;
922 offset = handle->cur->entries[handle->k];
925 error = hib_bio_read_page(offset, buf, bio_chain);
928 if (++handle->k >= MAP_PAGE_ENTRIES) {
930 free_page((unsigned long)handle->maps->map);
932 handle->maps = handle->maps->next;
935 release_swap_reader(handle);
937 handle->cur = handle->maps->map;
942 static int swap_reader_finish(struct swap_map_handle *handle)
944 release_swap_reader(handle);
950 * load_image - load the image using the swap map handle
951 * @handle and the snapshot handle @snapshot
952 * (assume there are @nr_pages pages to load)
955 static int load_image(struct swap_map_handle *handle,
956 struct snapshot_handle *snapshot,
957 unsigned int nr_to_read)
961 struct timeval start;
967 printk(KERN_INFO "PM: Loading image data pages (%u pages) ... ",
969 m = nr_to_read / 100;
974 do_gettimeofday(&start);
976 ret = snapshot_write_next(snapshot);
979 ret = swap_read_page(handle, data_of(*snapshot), &bio);
982 if (snapshot->sync_read)
983 ret = hib_wait_on_bio_chain(&bio);
987 printk("\b\b\b\b%3d%%", nr_pages / m);
990 err2 = hib_wait_on_bio_chain(&bio);
991 do_gettimeofday(&stop);
995 printk("\b\b\b\bdone\n");
996 snapshot_write_finalize(snapshot);
997 if (!snapshot_image_loaded(snapshot))
1001 swsusp_show_speed(&start, &stop, nr_to_read, "Read");
1006 * Structure used for LZO data decompression.
1009 struct task_struct *thr; /* thread */
1010 atomic_t ready; /* ready to start flag */
1011 atomic_t stop; /* ready to stop flag */
1012 int ret; /* return code */
1013 wait_queue_head_t go; /* start decompression */
1014 wait_queue_head_t done; /* decompression done */
1015 size_t unc_len; /* uncompressed length */
1016 size_t cmp_len; /* compressed length */
1017 unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */
1018 unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */
1022 * Deompression function that runs in its own thread.
1024 static int lzo_decompress_threadfn(void *data)
1026 struct dec_data *d = data;
1029 wait_event(d->go, atomic_read(&d->ready) ||
1030 kthread_should_stop());
1031 if (kthread_should_stop()) {
1034 atomic_set(&d->stop, 1);
1038 atomic_set(&d->ready, 0);
1040 d->unc_len = LZO_UNC_SIZE;
1041 d->ret = lzo1x_decompress_safe(d->cmp + LZO_HEADER, d->cmp_len,
1042 d->unc, &d->unc_len);
1043 atomic_set(&d->stop, 1);
1050 * load_image_lzo - Load compressed image data and decompress them with LZO.
1051 * @handle: Swap map handle to use for loading data.
1052 * @snapshot: Image to copy uncompressed data into.
1053 * @nr_to_read: Number of pages to load.
1055 static int load_image_lzo(struct swap_map_handle *handle,
1056 struct snapshot_handle *snapshot,
1057 unsigned int nr_to_read)
1063 struct timeval start;
1064 struct timeval stop;
1067 unsigned i, thr, run_threads, nr_threads;
1068 unsigned ring = 0, pg = 0, ring_size = 0,
1069 have = 0, want, need, asked = 0;
1070 unsigned long read_pages;
1071 unsigned char **page = NULL;
1072 struct dec_data *data = NULL;
1073 struct crc_data *crc = NULL;
1076 * We'll limit the number of threads for decompression to limit memory
1079 nr_threads = num_online_cpus() - 1;
1080 nr_threads = clamp_val(nr_threads, 1, LZO_THREADS);
1082 page = vmalloc(sizeof(*page) * LZO_READ_PAGES);
1084 printk(KERN_ERR "PM: Failed to allocate LZO page\n");
1089 data = vmalloc(sizeof(*data) * nr_threads);
1091 printk(KERN_ERR "PM: Failed to allocate LZO data\n");
1095 for (thr = 0; thr < nr_threads; thr++)
1096 memset(&data[thr], 0, offsetof(struct dec_data, go));
1098 crc = kmalloc(sizeof(*crc), GFP_KERNEL);
1100 printk(KERN_ERR "PM: Failed to allocate crc\n");
1104 memset(crc, 0, offsetof(struct crc_data, go));
1107 * Start the decompression threads.
1109 for (thr = 0; thr < nr_threads; thr++) {
1110 init_waitqueue_head(&data[thr].go);
1111 init_waitqueue_head(&data[thr].done);
1113 data[thr].thr = kthread_run(lzo_decompress_threadfn,
1115 "image_decompress/%u", thr);
1116 if (IS_ERR(data[thr].thr)) {
1117 data[thr].thr = NULL;
1119 "PM: Cannot start decompression threads\n");
1126 * Start the CRC32 thread.
1128 init_waitqueue_head(&crc->go);
1129 init_waitqueue_head(&crc->done);
1132 crc->crc32 = &handle->crc32;
1133 for (thr = 0; thr < nr_threads; thr++) {
1134 crc->unc[thr] = data[thr].unc;
1135 crc->unc_len[thr] = &data[thr].unc_len;
1138 crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32");
1139 if (IS_ERR(crc->thr)) {
1141 printk(KERN_ERR "PM: Cannot start CRC32 thread\n");
1147 * Adjust number of pages for read buffering, in case we are short.
1149 read_pages = (nr_free_pages() - snapshot_get_image_size()) >> 1;
1150 read_pages = clamp_val(read_pages, LZO_CMP_PAGES, LZO_READ_PAGES);
1152 for (i = 0; i < read_pages; i++) {
1153 page[i] = (void *)__get_free_page(i < LZO_CMP_PAGES ?
1154 __GFP_WAIT | __GFP_HIGH :
1157 if (i < LZO_CMP_PAGES) {
1160 "PM: Failed to allocate LZO pages\n");
1168 want = ring_size = i;
1171 "PM: Using %u thread(s) for decompression.\n"
1172 "PM: Loading and decompressing image data (%u pages) ... ",
1173 nr_threads, nr_to_read);
1174 m = nr_to_read / 100;
1179 do_gettimeofday(&start);
1181 ret = snapshot_write_next(snapshot);
1186 for (i = 0; !eof && i < want; i++) {
1187 ret = swap_read_page(handle, page[ring], &bio);
1190 * On real read error, finish. On end of data,
1191 * set EOF flag and just exit the read loop.
1194 handle->cur->entries[handle->k]) {
1201 if (++ring >= ring_size)
1208 * We are out of data, wait for some more.
1214 ret = hib_wait_on_bio_chain(&bio);
1223 if (crc->run_threads) {
1224 wait_event(crc->done, atomic_read(&crc->stop));
1225 atomic_set(&crc->stop, 0);
1226 crc->run_threads = 0;
1229 for (thr = 0; have && thr < nr_threads; thr++) {
1230 data[thr].cmp_len = *(size_t *)page[pg];
1231 if (unlikely(!data[thr].cmp_len ||
1233 lzo1x_worst_compress(LZO_UNC_SIZE))) {
1235 "PM: Invalid LZO compressed length\n");
1240 need = DIV_ROUND_UP(data[thr].cmp_len + LZO_HEADER,
1251 off < LZO_HEADER + data[thr].cmp_len;
1253 memcpy(data[thr].cmp + off,
1254 page[pg], PAGE_SIZE);
1257 if (++pg >= ring_size)
1261 atomic_set(&data[thr].ready, 1);
1262 wake_up(&data[thr].go);
1266 * Wait for more data while we are decompressing.
1268 if (have < LZO_CMP_PAGES && asked) {
1269 ret = hib_wait_on_bio_chain(&bio);
1278 for (run_threads = thr, thr = 0; thr < run_threads; thr++) {
1279 wait_event(data[thr].done,
1280 atomic_read(&data[thr].stop));
1281 atomic_set(&data[thr].stop, 0);
1283 ret = data[thr].ret;
1287 "PM: LZO decompression failed\n");
1291 if (unlikely(!data[thr].unc_len ||
1292 data[thr].unc_len > LZO_UNC_SIZE ||
1293 data[thr].unc_len & (PAGE_SIZE - 1))) {
1295 "PM: Invalid LZO uncompressed length\n");
1301 off < data[thr].unc_len; off += PAGE_SIZE) {
1302 memcpy(data_of(*snapshot),
1303 data[thr].unc + off, PAGE_SIZE);
1305 if (!(nr_pages % m))
1306 printk("\b\b\b\b%3d%%", nr_pages / m);
1309 ret = snapshot_write_next(snapshot);
1311 crc->run_threads = thr + 1;
1312 atomic_set(&crc->ready, 1);
1319 crc->run_threads = thr;
1320 atomic_set(&crc->ready, 1);
1325 if (crc->run_threads) {
1326 wait_event(crc->done, atomic_read(&crc->stop));
1327 atomic_set(&crc->stop, 0);
1329 do_gettimeofday(&stop);
1331 printk("\b\b\b\bdone\n");
1332 snapshot_write_finalize(snapshot);
1333 if (!snapshot_image_loaded(snapshot))
1336 if (swsusp_header->flags & SF_CRC32_MODE) {
1337 if(handle->crc32 != swsusp_header->crc32) {
1339 "PM: Invalid image CRC32!\n");
1346 swsusp_show_speed(&start, &stop, nr_to_read, "Read");
1348 for (i = 0; i < ring_size; i++)
1349 free_page((unsigned long)page[i]);
1352 kthread_stop(crc->thr);
1356 for (thr = 0; thr < nr_threads; thr++)
1358 kthread_stop(data[thr].thr);
1361 if (page) vfree(page);
1367 * swsusp_read - read the hibernation image.
1368 * @flags_p: flags passed by the "frozen" kernel in the image header should
1369 * be written into this memory location
1372 int swsusp_read(unsigned int *flags_p)
1375 struct swap_map_handle handle;
1376 struct snapshot_handle snapshot;
1377 struct swsusp_info *header;
1379 memset(&snapshot, 0, sizeof(struct snapshot_handle));
1380 error = snapshot_write_next(&snapshot);
1381 if (error < PAGE_SIZE)
1382 return error < 0 ? error : -EFAULT;
1383 header = (struct swsusp_info *)data_of(snapshot);
1384 error = get_swap_reader(&handle, flags_p);
1388 error = swap_read_page(&handle, header, NULL);
1390 error = (*flags_p & SF_NOCOMPRESS_MODE) ?
1391 load_image(&handle, &snapshot, header->pages - 1) :
1392 load_image_lzo(&handle, &snapshot, header->pages - 1);
1394 swap_reader_finish(&handle);
1397 pr_debug("PM: Image successfully loaded\n");
1399 pr_debug("PM: Error %d resuming\n", error);
1404 * swsusp_check - Check for swsusp signature in the resume device
1407 int swsusp_check(void)
1411 hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device,
1413 if (!IS_ERR(hib_resume_bdev)) {
1414 set_blocksize(hib_resume_bdev, PAGE_SIZE);
1415 clear_page(swsusp_header);
1416 error = hib_bio_read_page(swsusp_resume_block,
1417 swsusp_header, NULL);
1421 if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) {
1422 memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10);
1423 /* Reset swap signature now */
1424 error = hib_bio_write_page(swsusp_resume_block,
1425 swsusp_header, NULL);
1432 blkdev_put(hib_resume_bdev, FMODE_READ);
1434 pr_debug("PM: Image signature found, resuming\n");
1436 error = PTR_ERR(hib_resume_bdev);
1440 pr_debug("PM: Image not found (code %d)\n", error);
1446 * swsusp_close - close swap device.
1449 void swsusp_close(fmode_t mode)
1451 if (IS_ERR(hib_resume_bdev)) {
1452 pr_debug("PM: Image device not initialised\n");
1456 blkdev_put(hib_resume_bdev, mode);
1459 static int swsusp_header_init(void)
1461 swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL);
1463 panic("Could not allocate memory for swsusp_header\n");
1467 core_initcall(swsusp_header_init);