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10
11
12#define pr_fmt(fmt) "PM: " fmt
13
14#include <linux/export.h>
15#include <linux/suspend.h>
16#include <linux/reboot.h>
17#include <linux/string.h>
18#include <linux/device.h>
19#include <linux/async.h>
20#include <linux/delay.h>
21#include <linux/fs.h>
22#include <linux/mount.h>
23#include <linux/pm.h>
24#include <linux/nmi.h>
25#include <linux/console.h>
26#include <linux/cpu.h>
27#include <linux/freezer.h>
28#include <linux/gfp.h>
29#include <linux/syscore_ops.h>
30#include <linux/ctype.h>
31#include <linux/genhd.h>
32#include <linux/ktime.h>
33#include <trace/events/power.h>
34
35#include "power.h"
36
37
38static int nocompress;
39static int noresume;
40static int nohibernate;
41static int resume_wait;
42static unsigned int resume_delay;
43static char resume_file[256] = CONFIG_PM_STD_PARTITION;
44dev_t swsusp_resume_device;
45sector_t swsusp_resume_block;
46__visible int in_suspend __nosavedata;
47
48enum {
49 HIBERNATION_INVALID,
50 HIBERNATION_PLATFORM,
51 HIBERNATION_SHUTDOWN,
52 HIBERNATION_REBOOT,
53#ifdef CONFIG_SUSPEND
54 HIBERNATION_SUSPEND,
55#endif
56 HIBERNATION_TEST_RESUME,
57
58 __HIBERNATION_AFTER_LAST
59};
60#define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
61#define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
62
63static int hibernation_mode = HIBERNATION_SHUTDOWN;
64
65bool freezer_test_done;
66
67static const struct platform_hibernation_ops *hibernation_ops;
68
69bool hibernation_available(void)
70{
71 return (nohibernate == 0);
72}
73
74
75
76
77
78void hibernation_set_ops(const struct platform_hibernation_ops *ops)
79{
80 if (ops && !(ops->begin && ops->end && ops->pre_snapshot
81 && ops->prepare && ops->finish && ops->enter && ops->pre_restore
82 && ops->restore_cleanup && ops->leave)) {
83 WARN_ON(1);
84 return;
85 }
86 lock_system_sleep();
87 hibernation_ops = ops;
88 if (ops)
89 hibernation_mode = HIBERNATION_PLATFORM;
90 else if (hibernation_mode == HIBERNATION_PLATFORM)
91 hibernation_mode = HIBERNATION_SHUTDOWN;
92
93 unlock_system_sleep();
94}
95EXPORT_SYMBOL_GPL(hibernation_set_ops);
96
97static bool entering_platform_hibernation;
98
99bool system_entering_hibernation(void)
100{
101 return entering_platform_hibernation;
102}
103EXPORT_SYMBOL(system_entering_hibernation);
104
105#ifdef CONFIG_PM_DEBUG
106static void hibernation_debug_sleep(void)
107{
108 pr_info("hibernation debug: Waiting for 5 seconds.\n");
109 mdelay(5000);
110}
111
112static int hibernation_test(int level)
113{
114 if (pm_test_level == level) {
115 hibernation_debug_sleep();
116 return 1;
117 }
118 return 0;
119}
120#else
121static int hibernation_test(int level) { return 0; }
122#endif
123
124
125
126
127
128static int platform_begin(int platform_mode)
129{
130 return (platform_mode && hibernation_ops) ?
131 hibernation_ops->begin(PMSG_FREEZE) : 0;
132}
133
134
135
136
137
138static void platform_end(int platform_mode)
139{
140 if (platform_mode && hibernation_ops)
141 hibernation_ops->end();
142}
143
144
145
146
147
148
149
150
151
152static int platform_pre_snapshot(int platform_mode)
153{
154 return (platform_mode && hibernation_ops) ?
155 hibernation_ops->pre_snapshot() : 0;
156}
157
158
159
160
161
162
163
164
165
166
167static void platform_leave(int platform_mode)
168{
169 if (platform_mode && hibernation_ops)
170 hibernation_ops->leave();
171}
172
173
174
175
176
177
178
179
180
181
182static void platform_finish(int platform_mode)
183{
184 if (platform_mode && hibernation_ops)
185 hibernation_ops->finish();
186}
187
188
189
190
191
192
193
194
195
196
197
198static int platform_pre_restore(int platform_mode)
199{
200 return (platform_mode && hibernation_ops) ?
201 hibernation_ops->pre_restore() : 0;
202}
203
204
205
206
207
208
209
210
211
212
213
214
215static void platform_restore_cleanup(int platform_mode)
216{
217 if (platform_mode && hibernation_ops)
218 hibernation_ops->restore_cleanup();
219}
220
221
222
223
224
225static void platform_recover(int platform_mode)
226{
227 if (platform_mode && hibernation_ops && hibernation_ops->recover)
228 hibernation_ops->recover();
229}
230
231
232
233
234
235
236
237
238void swsusp_show_speed(ktime_t start, ktime_t stop,
239 unsigned nr_pages, char *msg)
240{
241 ktime_t diff;
242 u64 elapsed_centisecs64;
243 unsigned int centisecs;
244 unsigned int k;
245 unsigned int kps;
246
247 diff = ktime_sub(stop, start);
248 elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC);
249 centisecs = elapsed_centisecs64;
250 if (centisecs == 0)
251 centisecs = 1;
252 k = nr_pages * (PAGE_SIZE / 1024);
253 kps = (k * 100) / centisecs;
254 pr_info("%s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n",
255 msg, k, centisecs / 100, centisecs % 100, kps / 1000,
256 (kps % 1000) / 10);
257}
258
259__weak int arch_resume_nosmt(void)
260{
261 return 0;
262}
263
264
265
266
267
268
269
270
271
272
273static int create_image(int platform_mode)
274{
275 int error;
276
277 error = dpm_suspend_end(PMSG_FREEZE);
278 if (error) {
279 pr_err("Some devices failed to power down, aborting hibernation\n");
280 return error;
281 }
282
283 error = platform_pre_snapshot(platform_mode);
284 if (error || hibernation_test(TEST_PLATFORM))
285 goto Platform_finish;
286
287 error = suspend_disable_secondary_cpus();
288 if (error || hibernation_test(TEST_CPUS))
289 goto Enable_cpus;
290
291 local_irq_disable();
292
293 system_state = SYSTEM_SUSPEND;
294
295 error = syscore_suspend();
296 if (error) {
297 pr_err("Some system devices failed to power down, aborting hibernation\n");
298 goto Enable_irqs;
299 }
300
301 if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
302 goto Power_up;
303
304 in_suspend = 1;
305 save_processor_state();
306 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
307 error = swsusp_arch_suspend();
308
309 restore_processor_state();
310 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
311 if (error)
312 pr_err("Error %d creating hibernation image\n", error);
313
314 if (!in_suspend) {
315 events_check_enabled = false;
316 clear_free_pages();
317 }
318
319 platform_leave(platform_mode);
320
321 Power_up:
322 syscore_resume();
323
324 Enable_irqs:
325 system_state = SYSTEM_RUNNING;
326 local_irq_enable();
327
328 Enable_cpus:
329 suspend_enable_secondary_cpus();
330
331
332 if (!in_suspend)
333 error = arch_resume_nosmt();
334
335 Platform_finish:
336 platform_finish(platform_mode);
337
338 dpm_resume_start(in_suspend ?
339 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
340
341 return error;
342}
343
344
345
346
347
348
349
350int hibernation_snapshot(int platform_mode)
351{
352 pm_message_t msg;
353 int error;
354
355 pm_suspend_clear_flags();
356 error = platform_begin(platform_mode);
357 if (error)
358 goto Close;
359
360
361 error = hibernate_preallocate_memory();
362 if (error)
363 goto Close;
364
365 error = freeze_kernel_threads();
366 if (error)
367 goto Cleanup;
368
369 if (hibernation_test(TEST_FREEZER)) {
370
371
372
373
374
375 freezer_test_done = true;
376 goto Thaw;
377 }
378
379 error = dpm_prepare(PMSG_FREEZE);
380 if (error) {
381 dpm_complete(PMSG_RECOVER);
382 goto Thaw;
383 }
384
385 suspend_console();
386 pm_restrict_gfp_mask();
387
388 error = dpm_suspend(PMSG_FREEZE);
389
390 if (error || hibernation_test(TEST_DEVICES))
391 platform_recover(platform_mode);
392 else
393 error = create_image(platform_mode);
394
395
396
397
398
399
400
401
402 if (error || !in_suspend)
403 swsusp_free();
404
405 msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE;
406 dpm_resume(msg);
407
408 if (error || !in_suspend)
409 pm_restore_gfp_mask();
410
411 resume_console();
412 dpm_complete(msg);
413
414 Close:
415 platform_end(platform_mode);
416 return error;
417
418 Thaw:
419 thaw_kernel_threads();
420 Cleanup:
421 swsusp_free();
422 goto Close;
423}
424
425int __weak hibernate_resume_nonboot_cpu_disable(void)
426{
427 return suspend_disable_secondary_cpus();
428}
429
430
431
432
433
434
435
436
437
438
439static int resume_target_kernel(bool platform_mode)
440{
441 int error;
442
443 error = dpm_suspend_end(PMSG_QUIESCE);
444 if (error) {
445 pr_err("Some devices failed to power down, aborting resume\n");
446 return error;
447 }
448
449 error = platform_pre_restore(platform_mode);
450 if (error)
451 goto Cleanup;
452
453 error = hibernate_resume_nonboot_cpu_disable();
454 if (error)
455 goto Enable_cpus;
456
457 local_irq_disable();
458 system_state = SYSTEM_SUSPEND;
459
460 error = syscore_suspend();
461 if (error)
462 goto Enable_irqs;
463
464 save_processor_state();
465 error = restore_highmem();
466 if (!error) {
467 error = swsusp_arch_resume();
468
469
470
471
472
473 BUG_ON(!error);
474
475
476
477
478 restore_highmem();
479 }
480
481
482
483
484
485 swsusp_free();
486 restore_processor_state();
487 touch_softlockup_watchdog();
488
489 syscore_resume();
490
491 Enable_irqs:
492 system_state = SYSTEM_RUNNING;
493 local_irq_enable();
494
495 Enable_cpus:
496 suspend_enable_secondary_cpus();
497
498 Cleanup:
499 platform_restore_cleanup(platform_mode);
500
501 dpm_resume_start(PMSG_RECOVER);
502
503 return error;
504}
505
506
507
508
509
510
511
512
513
514int hibernation_restore(int platform_mode)
515{
516 int error;
517
518 pm_prepare_console();
519 suspend_console();
520 pm_restrict_gfp_mask();
521 error = dpm_suspend_start(PMSG_QUIESCE);
522 if (!error) {
523 error = resume_target_kernel(platform_mode);
524
525
526
527
528
529 BUG_ON(!error);
530 }
531 dpm_resume_end(PMSG_RECOVER);
532 pm_restore_gfp_mask();
533 resume_console();
534 pm_restore_console();
535 return error;
536}
537
538
539
540
541int hibernation_platform_enter(void)
542{
543 int error;
544
545 if (!hibernation_ops)
546 return -ENOSYS;
547
548
549
550
551
552
553 error = hibernation_ops->begin(PMSG_HIBERNATE);
554 if (error)
555 goto Close;
556
557 entering_platform_hibernation = true;
558 suspend_console();
559 error = dpm_suspend_start(PMSG_HIBERNATE);
560 if (error) {
561 if (hibernation_ops->recover)
562 hibernation_ops->recover();
563 goto Resume_devices;
564 }
565
566 error = dpm_suspend_end(PMSG_HIBERNATE);
567 if (error)
568 goto Resume_devices;
569
570 error = hibernation_ops->prepare();
571 if (error)
572 goto Platform_finish;
573
574 error = suspend_disable_secondary_cpus();
575 if (error)
576 goto Enable_cpus;
577
578 local_irq_disable();
579 system_state = SYSTEM_SUSPEND;
580 syscore_suspend();
581 if (pm_wakeup_pending()) {
582 error = -EAGAIN;
583 goto Power_up;
584 }
585
586 hibernation_ops->enter();
587
588 while (1);
589
590 Power_up:
591 syscore_resume();
592 system_state = SYSTEM_RUNNING;
593 local_irq_enable();
594
595 Enable_cpus:
596 suspend_enable_secondary_cpus();
597
598 Platform_finish:
599 hibernation_ops->finish();
600
601 dpm_resume_start(PMSG_RESTORE);
602
603 Resume_devices:
604 entering_platform_hibernation = false;
605 dpm_resume_end(PMSG_RESTORE);
606 resume_console();
607
608 Close:
609 hibernation_ops->end();
610
611 return error;
612}
613
614
615
616
617
618
619
620
621static void power_down(void)
622{
623#ifdef CONFIG_SUSPEND
624 int error;
625
626 if (hibernation_mode == HIBERNATION_SUSPEND) {
627 error = suspend_devices_and_enter(PM_SUSPEND_MEM);
628 if (error) {
629 hibernation_mode = hibernation_ops ?
630 HIBERNATION_PLATFORM :
631 HIBERNATION_SHUTDOWN;
632 } else {
633
634 error = swsusp_unmark();
635 if (error)
636 pr_err("Swap will be unusable! Try swapon -a.\n");
637
638 return;
639 }
640 }
641#endif
642
643 switch (hibernation_mode) {
644 case HIBERNATION_REBOOT:
645 kernel_restart(NULL);
646 break;
647 case HIBERNATION_PLATFORM:
648 hibernation_platform_enter();
649
650 case HIBERNATION_SHUTDOWN:
651 if (pm_power_off)
652 kernel_power_off();
653 break;
654 }
655 kernel_halt();
656
657
658
659
660 pr_crit("Power down manually\n");
661 while (1)
662 cpu_relax();
663}
664
665static int load_image_and_restore(void)
666{
667 int error;
668 unsigned int flags;
669
670 pm_pr_dbg("Loading hibernation image.\n");
671
672 lock_device_hotplug();
673 error = create_basic_memory_bitmaps();
674 if (error)
675 goto Unlock;
676
677 error = swsusp_read(&flags);
678 swsusp_close(FMODE_READ);
679 if (!error)
680 hibernation_restore(flags & SF_PLATFORM_MODE);
681
682 pr_err("Failed to load hibernation image, recovering.\n");
683 swsusp_free();
684 free_basic_memory_bitmaps();
685 Unlock:
686 unlock_device_hotplug();
687
688 return error;
689}
690
691
692
693
694int hibernate(void)
695{
696 int error, nr_calls = 0;
697 bool snapshot_test = false;
698
699 if (!hibernation_available()) {
700 pm_pr_dbg("Hibernation not available.\n");
701 return -EPERM;
702 }
703
704 lock_system_sleep();
705
706 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
707 error = -EBUSY;
708 goto Unlock;
709 }
710
711 pr_info("hibernation entry\n");
712 pm_prepare_console();
713 error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
714 if (error) {
715 nr_calls--;
716 goto Exit;
717 }
718
719 ksys_sync_helper();
720
721 error = freeze_processes();
722 if (error)
723 goto Exit;
724
725 lock_device_hotplug();
726
727 error = create_basic_memory_bitmaps();
728 if (error)
729 goto Thaw;
730
731 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
732 if (error || freezer_test_done)
733 goto Free_bitmaps;
734
735 if (in_suspend) {
736 unsigned int flags = 0;
737
738 if (hibernation_mode == HIBERNATION_PLATFORM)
739 flags |= SF_PLATFORM_MODE;
740 if (nocompress)
741 flags |= SF_NOCOMPRESS_MODE;
742 else
743 flags |= SF_CRC32_MODE;
744
745 pm_pr_dbg("Writing image.\n");
746 error = swsusp_write(flags);
747 swsusp_free();
748 if (!error) {
749 if (hibernation_mode == HIBERNATION_TEST_RESUME)
750 snapshot_test = true;
751 else
752 power_down();
753 }
754 in_suspend = 0;
755 pm_restore_gfp_mask();
756 } else {
757 pm_pr_dbg("Image restored successfully.\n");
758 }
759
760 Free_bitmaps:
761 free_basic_memory_bitmaps();
762 Thaw:
763 unlock_device_hotplug();
764 if (snapshot_test) {
765 pm_pr_dbg("Checking hibernation image\n");
766 error = swsusp_check();
767 if (!error)
768 error = load_image_and_restore();
769 }
770 thaw_processes();
771
772
773 freezer_test_done = false;
774 Exit:
775 __pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL);
776 pm_restore_console();
777 atomic_inc(&snapshot_device_available);
778 Unlock:
779 unlock_system_sleep();
780 pr_info("hibernation exit\n");
781
782 return error;
783}
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801static int software_resume(void)
802{
803 int error, nr_calls = 0;
804
805
806
807
808 if (noresume || !hibernation_available())
809 return 0;
810
811
812
813
814
815
816
817
818
819
820
821 mutex_lock_nested(&system_transition_mutex, SINGLE_DEPTH_NESTING);
822
823 if (swsusp_resume_device)
824 goto Check_image;
825
826 if (!strlen(resume_file)) {
827 error = -ENOENT;
828 goto Unlock;
829 }
830
831 pm_pr_dbg("Checking hibernation image partition %s\n", resume_file);
832
833 if (resume_delay) {
834 pr_info("Waiting %dsec before reading resume device ...\n",
835 resume_delay);
836 ssleep(resume_delay);
837 }
838
839
840 swsusp_resume_device = name_to_dev_t(resume_file);
841
842
843
844
845
846 if (isdigit(resume_file[0]) && resume_wait) {
847 int partno;
848 while (!get_gendisk(swsusp_resume_device, &partno))
849 msleep(10);
850 }
851
852 if (!swsusp_resume_device) {
853
854
855
856
857 wait_for_device_probe();
858
859 if (resume_wait) {
860 while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
861 msleep(10);
862 async_synchronize_full();
863 }
864
865 swsusp_resume_device = name_to_dev_t(resume_file);
866 if (!swsusp_resume_device) {
867 error = -ENODEV;
868 goto Unlock;
869 }
870 }
871
872 Check_image:
873 pm_pr_dbg("Hibernation image partition %d:%d present\n",
874 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
875
876 pm_pr_dbg("Looking for hibernation image.\n");
877 error = swsusp_check();
878 if (error)
879 goto Unlock;
880
881
882 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
883 error = -EBUSY;
884 swsusp_close(FMODE_READ);
885 goto Unlock;
886 }
887
888 pr_info("resume from hibernation\n");
889 pm_prepare_console();
890 error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls);
891 if (error) {
892 nr_calls--;
893 goto Close_Finish;
894 }
895
896 pm_pr_dbg("Preparing processes for restore.\n");
897 error = freeze_processes();
898 if (error)
899 goto Close_Finish;
900 error = load_image_and_restore();
901 thaw_processes();
902 Finish:
903 __pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
904 pm_restore_console();
905 pr_info("resume from hibernation failed (%d)\n", error);
906 atomic_inc(&snapshot_device_available);
907
908 Unlock:
909 mutex_unlock(&system_transition_mutex);
910 pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
911 return error;
912 Close_Finish:
913 swsusp_close(FMODE_READ);
914 goto Finish;
915}
916
917late_initcall_sync(software_resume);
918
919
920static const char * const hibernation_modes[] = {
921 [HIBERNATION_PLATFORM] = "platform",
922 [HIBERNATION_SHUTDOWN] = "shutdown",
923 [HIBERNATION_REBOOT] = "reboot",
924#ifdef CONFIG_SUSPEND
925 [HIBERNATION_SUSPEND] = "suspend",
926#endif
927 [HIBERNATION_TEST_RESUME] = "test_resume",
928};
929
930
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932
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954
955
956static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
957 char *buf)
958{
959 int i;
960 char *start = buf;
961
962 if (!hibernation_available())
963 return sprintf(buf, "[disabled]\n");
964
965 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
966 if (!hibernation_modes[i])
967 continue;
968 switch (i) {
969 case HIBERNATION_SHUTDOWN:
970 case HIBERNATION_REBOOT:
971#ifdef CONFIG_SUSPEND
972 case HIBERNATION_SUSPEND:
973#endif
974 case HIBERNATION_TEST_RESUME:
975 break;
976 case HIBERNATION_PLATFORM:
977 if (hibernation_ops)
978 break;
979
980 continue;
981 }
982 if (i == hibernation_mode)
983 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
984 else
985 buf += sprintf(buf, "%s ", hibernation_modes[i]);
986 }
987 buf += sprintf(buf, "\n");
988 return buf-start;
989}
990
991static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
992 const char *buf, size_t n)
993{
994 int error = 0;
995 int i;
996 int len;
997 char *p;
998 int mode = HIBERNATION_INVALID;
999
1000 if (!hibernation_available())
1001 return -EPERM;
1002
1003 p = memchr(buf, '\n', n);
1004 len = p ? p - buf : n;
1005
1006 lock_system_sleep();
1007 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1008 if (len == strlen(hibernation_modes[i])
1009 && !strncmp(buf, hibernation_modes[i], len)) {
1010 mode = i;
1011 break;
1012 }
1013 }
1014 if (mode != HIBERNATION_INVALID) {
1015 switch (mode) {
1016 case HIBERNATION_SHUTDOWN:
1017 case HIBERNATION_REBOOT:
1018#ifdef CONFIG_SUSPEND
1019 case HIBERNATION_SUSPEND:
1020#endif
1021 case HIBERNATION_TEST_RESUME:
1022 hibernation_mode = mode;
1023 break;
1024 case HIBERNATION_PLATFORM:
1025 if (hibernation_ops)
1026 hibernation_mode = mode;
1027 else
1028 error = -EINVAL;
1029 }
1030 } else
1031 error = -EINVAL;
1032
1033 if (!error)
1034 pm_pr_dbg("Hibernation mode set to '%s'\n",
1035 hibernation_modes[mode]);
1036 unlock_system_sleep();
1037 return error ? error : n;
1038}
1039
1040power_attr(disk);
1041
1042static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
1043 char *buf)
1044{
1045 return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
1046 MINOR(swsusp_resume_device));
1047}
1048
1049static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
1050 const char *buf, size_t n)
1051{
1052 dev_t res;
1053 int len = n;
1054 char *name;
1055
1056 if (len && buf[len-1] == '\n')
1057 len--;
1058 name = kstrndup(buf, len, GFP_KERNEL);
1059 if (!name)
1060 return -ENOMEM;
1061
1062 res = name_to_dev_t(name);
1063 kfree(name);
1064 if (!res)
1065 return -EINVAL;
1066
1067 lock_system_sleep();
1068 swsusp_resume_device = res;
1069 unlock_system_sleep();
1070 pm_pr_dbg("Configured resume from disk to %u\n", swsusp_resume_device);
1071 noresume = 0;
1072 software_resume();
1073 return n;
1074}
1075
1076power_attr(resume);
1077
1078static ssize_t resume_offset_show(struct kobject *kobj,
1079 struct kobj_attribute *attr, char *buf)
1080{
1081 return sprintf(buf, "%llu\n", (unsigned long long)swsusp_resume_block);
1082}
1083
1084static ssize_t resume_offset_store(struct kobject *kobj,
1085 struct kobj_attribute *attr, const char *buf,
1086 size_t n)
1087{
1088 unsigned long long offset;
1089 int rc;
1090
1091 rc = kstrtoull(buf, 0, &offset);
1092 if (rc)
1093 return rc;
1094 swsusp_resume_block = offset;
1095
1096 return n;
1097}
1098
1099power_attr(resume_offset);
1100
1101static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
1102 char *buf)
1103{
1104 return sprintf(buf, "%lu\n", image_size);
1105}
1106
1107static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
1108 const char *buf, size_t n)
1109{
1110 unsigned long size;
1111
1112 if (sscanf(buf, "%lu", &size) == 1) {
1113 image_size = size;
1114 return n;
1115 }
1116
1117 return -EINVAL;
1118}
1119
1120power_attr(image_size);
1121
1122static ssize_t reserved_size_show(struct kobject *kobj,
1123 struct kobj_attribute *attr, char *buf)
1124{
1125 return sprintf(buf, "%lu\n", reserved_size);
1126}
1127
1128static ssize_t reserved_size_store(struct kobject *kobj,
1129 struct kobj_attribute *attr,
1130 const char *buf, size_t n)
1131{
1132 unsigned long size;
1133
1134 if (sscanf(buf, "%lu", &size) == 1) {
1135 reserved_size = size;
1136 return n;
1137 }
1138
1139 return -EINVAL;
1140}
1141
1142power_attr(reserved_size);
1143
1144static struct attribute * g[] = {
1145 &disk_attr.attr,
1146 &resume_offset_attr.attr,
1147 &resume_attr.attr,
1148 &image_size_attr.attr,
1149 &reserved_size_attr.attr,
1150 NULL,
1151};
1152
1153
1154static const struct attribute_group attr_group = {
1155 .attrs = g,
1156};
1157
1158
1159static int __init pm_disk_init(void)
1160{
1161 return sysfs_create_group(power_kobj, &attr_group);
1162}
1163
1164core_initcall(pm_disk_init);
1165
1166
1167static int __init resume_setup(char *str)
1168{
1169 if (noresume)
1170 return 1;
1171
1172 strncpy( resume_file, str, 255 );
1173 return 1;
1174}
1175
1176static int __init resume_offset_setup(char *str)
1177{
1178 unsigned long long offset;
1179
1180 if (noresume)
1181 return 1;
1182
1183 if (sscanf(str, "%llu", &offset) == 1)
1184 swsusp_resume_block = offset;
1185
1186 return 1;
1187}
1188
1189static int __init hibernate_setup(char *str)
1190{
1191 if (!strncmp(str, "noresume", 8)) {
1192 noresume = 1;
1193 } else if (!strncmp(str, "nocompress", 10)) {
1194 nocompress = 1;
1195 } else if (!strncmp(str, "no", 2)) {
1196 noresume = 1;
1197 nohibernate = 1;
1198 } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)
1199 && !strncmp(str, "protect_image", 13)) {
1200 enable_restore_image_protection();
1201 }
1202 return 1;
1203}
1204
1205static int __init noresume_setup(char *str)
1206{
1207 noresume = 1;
1208 return 1;
1209}
1210
1211static int __init resumewait_setup(char *str)
1212{
1213 resume_wait = 1;
1214 return 1;
1215}
1216
1217static int __init resumedelay_setup(char *str)
1218{
1219 int rc = kstrtouint(str, 0, &resume_delay);
1220
1221 if (rc)
1222 return rc;
1223 return 1;
1224}
1225
1226static int __init nohibernate_setup(char *str)
1227{
1228 noresume = 1;
1229 nohibernate = 1;
1230 return 1;
1231}
1232
1233__setup("noresume", noresume_setup);
1234__setup("resume_offset=", resume_offset_setup);
1235__setup("resume=", resume_setup);
1236__setup("hibernate=", hibernate_setup);
1237__setup("resumewait", resumewait_setup);
1238__setup("resumedelay=", resumedelay_setup);
1239__setup("nohibernate", nohibernate_setup);
1240