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