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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support.
4 *
5 * Copyright (c) 2003 Patrick Mochel
6 * Copyright (c) 2003 Open Source Development Lab
7 * Copyright (c) 2004 Pavel Machek <pavel@ucw.cz>
8 * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.
9 * Copyright (C) 2012 Bojan Smojver <bojan@rexursive.com>
10 */
11
12#define pr_fmt(fmt) "PM: hibernation: " 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 <linux/security.h>
34#include <trace/events/power.h>
35
36#include "power.h"
37
38
39static int nocompress;
40static int noresume;
41static int nohibernate;
42static int resume_wait;
43static unsigned int resume_delay;
44static char resume_file[256] = CONFIG_PM_STD_PARTITION;
45dev_t swsusp_resume_device;
46sector_t swsusp_resume_block;
47__visible int in_suspend __nosavedata;
48
49enum {
50 HIBERNATION_INVALID,
51 HIBERNATION_PLATFORM,
52 HIBERNATION_SHUTDOWN,
53 HIBERNATION_REBOOT,
54#ifdef CONFIG_SUSPEND
55 HIBERNATION_SUSPEND,
56#endif
57 HIBERNATION_TEST_RESUME,
58 /* keep last */
59 __HIBERNATION_AFTER_LAST
60};
61#define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
62#define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
63
64static int hibernation_mode = HIBERNATION_SHUTDOWN;
65
66bool freezer_test_done;
67
68static const struct platform_hibernation_ops *hibernation_ops;
69
70static atomic_t hibernate_atomic = ATOMIC_INIT(1);
71
72bool hibernate_acquire(void)
73{
74 return atomic_add_unless(&hibernate_atomic, -1, 0);
75}
76
77void hibernate_release(void)
78{
79 atomic_inc(&hibernate_atomic);
80}
81
82bool hibernation_available(void)
83{
84 return nohibernate == 0 && !security_locked_down(LOCKDOWN_HIBERNATION);
85}
86
87/**
88 * hibernation_set_ops - Set the global hibernate operations.
89 * @ops: Hibernation operations to use in subsequent hibernation transitions.
90 */
91void hibernation_set_ops(const struct platform_hibernation_ops *ops)
92{
93 if (ops && !(ops->begin && ops->end && ops->pre_snapshot
94 && ops->prepare && ops->finish && ops->enter && ops->pre_restore
95 && ops->restore_cleanup && ops->leave)) {
96 WARN_ON(1);
97 return;
98 }
99 lock_system_sleep();
100 hibernation_ops = ops;
101 if (ops)
102 hibernation_mode = HIBERNATION_PLATFORM;
103 else if (hibernation_mode == HIBERNATION_PLATFORM)
104 hibernation_mode = HIBERNATION_SHUTDOWN;
105
106 unlock_system_sleep();
107}
108EXPORT_SYMBOL_GPL(hibernation_set_ops);
109
110static bool entering_platform_hibernation;
111
112bool system_entering_hibernation(void)
113{
114 return entering_platform_hibernation;
115}
116EXPORT_SYMBOL(system_entering_hibernation);
117
118#ifdef CONFIG_PM_DEBUG
119static void hibernation_debug_sleep(void)
120{
121 pr_info("debug: Waiting for 5 seconds.\n");
122 mdelay(5000);
123}
124
125static int hibernation_test(int level)
126{
127 if (pm_test_level == level) {
128 hibernation_debug_sleep();
129 return 1;
130 }
131 return 0;
132}
133#else /* !CONFIG_PM_DEBUG */
134static int hibernation_test(int level) { return 0; }
135#endif /* !CONFIG_PM_DEBUG */
136
137/**
138 * platform_begin - Call platform to start hibernation.
139 * @platform_mode: Whether or not to use the platform driver.
140 */
141static int platform_begin(int platform_mode)
142{
143 return (platform_mode && hibernation_ops) ?
144 hibernation_ops->begin(PMSG_FREEZE) : 0;
145}
146
147/**
148 * platform_end - Call platform to finish transition to the working state.
149 * @platform_mode: Whether or not to use the platform driver.
150 */
151static void platform_end(int platform_mode)
152{
153 if (platform_mode && hibernation_ops)
154 hibernation_ops->end();
155}
156
157/**
158 * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
159 * @platform_mode: Whether or not to use the platform driver.
160 *
161 * Use the platform driver to prepare the system for creating a hibernate image,
162 * if so configured, and return an error code if that fails.
163 */
164
165static int platform_pre_snapshot(int platform_mode)
166{
167 return (platform_mode && hibernation_ops) ?
168 hibernation_ops->pre_snapshot() : 0;
169}
170
171/**
172 * platform_leave - Call platform to prepare a transition to the working state.
173 * @platform_mode: Whether or not to use the platform driver.
174 *
175 * Use the platform driver prepare to prepare the machine for switching to the
176 * normal mode of operation.
177 *
178 * This routine is called on one CPU with interrupts disabled.
179 */
180static void platform_leave(int platform_mode)
181{
182 if (platform_mode && hibernation_ops)
183 hibernation_ops->leave();
184}
185
186/**
187 * platform_finish - Call platform to switch the system to the working state.
188 * @platform_mode: Whether or not to use the platform driver.
189 *
190 * Use the platform driver to switch the machine to the normal mode of
191 * operation.
192 *
193 * This routine must be called after platform_prepare().
194 */
195static void platform_finish(int platform_mode)
196{
197 if (platform_mode && hibernation_ops)
198 hibernation_ops->finish();
199}
200
201/**
202 * platform_pre_restore - Prepare for hibernate image restoration.
203 * @platform_mode: Whether or not to use the platform driver.
204 *
205 * Use the platform driver to prepare the system for resume from a hibernation
206 * image.
207 *
208 * If the restore fails after this function has been called,
209 * platform_restore_cleanup() must be called.
210 */
211static int platform_pre_restore(int platform_mode)
212{
213 return (platform_mode && hibernation_ops) ?
214 hibernation_ops->pre_restore() : 0;
215}
216
217/**
218 * platform_restore_cleanup - Switch to the working state after failing restore.
219 * @platform_mode: Whether or not to use the platform driver.
220 *
221 * Use the platform driver to switch the system to the normal mode of operation
222 * after a failing restore.
223 *
224 * If platform_pre_restore() has been called before the failing restore, this
225 * function must be called too, regardless of the result of
226 * platform_pre_restore().
227 */
228static void platform_restore_cleanup(int platform_mode)
229{
230 if (platform_mode && hibernation_ops)
231 hibernation_ops->restore_cleanup();
232}
233
234/**
235 * platform_recover - Recover from a failure to suspend devices.
236 * @platform_mode: Whether or not to use the platform driver.
237 */
238static void platform_recover(int platform_mode)
239{
240 if (platform_mode && hibernation_ops && hibernation_ops->recover)
241 hibernation_ops->recover();
242}
243
244/**
245 * swsusp_show_speed - Print time elapsed between two events during hibernation.
246 * @start: Starting event.
247 * @stop: Final event.
248 * @nr_pages: Number of memory pages processed between @start and @stop.
249 * @msg: Additional diagnostic message to print.
250 */
251void swsusp_show_speed(ktime_t start, ktime_t stop,
252 unsigned nr_pages, char *msg)
253{
254 ktime_t diff;
255 u64 elapsed_centisecs64;
256 unsigned int centisecs;
257 unsigned int k;
258 unsigned int kps;
259
260 diff = ktime_sub(stop, start);
261 elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC);
262 centisecs = elapsed_centisecs64;
263 if (centisecs == 0)
264 centisecs = 1; /* avoid div-by-zero */
265 k = nr_pages * (PAGE_SIZE / 1024);
266 kps = (k * 100) / centisecs;
267 pr_info("%s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n",
268 msg, k, centisecs / 100, centisecs % 100, kps / 1000,
269 (kps % 1000) / 10);
270}
271
272__weak int arch_resume_nosmt(void)
273{
274 return 0;
275}
276
277/**
278 * create_image - Create a hibernation image.
279 * @platform_mode: Whether or not to use the platform driver.
280 *
281 * Execute device drivers' "late" and "noirq" freeze callbacks, create a
282 * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
283 *
284 * Control reappears in this routine after the subsequent restore.
285 */
286static int create_image(int platform_mode)
287{
288 int error;
289
290 error = dpm_suspend_end(PMSG_FREEZE);
291 if (error) {
292 pr_err("Some devices failed to power down, aborting\n");
293 return error;
294 }
295
296 error = platform_pre_snapshot(platform_mode);
297 if (error || hibernation_test(TEST_PLATFORM))
298 goto Platform_finish;
299
300 error = suspend_disable_secondary_cpus();
301 if (error || hibernation_test(TEST_CPUS))
302 goto Enable_cpus;
303
304 local_irq_disable();
305
306 system_state = SYSTEM_SUSPEND;
307
308 error = syscore_suspend();
309 if (error) {
310 pr_err("Some system devices failed to power down, aborting\n");
311 goto Enable_irqs;
312 }
313
314 if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
315 goto Power_up;
316
317 in_suspend = 1;
318 save_processor_state();
319 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
320 error = swsusp_arch_suspend();
321 /* Restore control flow magically appears here */
322 restore_processor_state();
323 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
324 if (error)
325 pr_err("Error %d creating image\n", error);
326
327 if (!in_suspend) {
328 events_check_enabled = false;
329 clear_free_pages();
330 }
331
332 platform_leave(platform_mode);
333
334 Power_up:
335 syscore_resume();
336
337 Enable_irqs:
338 system_state = SYSTEM_RUNNING;
339 local_irq_enable();
340
341 Enable_cpus:
342 suspend_enable_secondary_cpus();
343
344 /* Allow architectures to do nosmt-specific post-resume dances */
345 if (!in_suspend)
346 error = arch_resume_nosmt();
347
348 Platform_finish:
349 platform_finish(platform_mode);
350
351 dpm_resume_start(in_suspend ?
352 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
353
354 return error;
355}
356
357/**
358 * hibernation_snapshot - Quiesce devices and create a hibernation image.
359 * @platform_mode: If set, use platform driver to prepare for the transition.
360 *
361 * This routine must be called with system_transition_mutex held.
362 */
363int hibernation_snapshot(int platform_mode)
364{
365 pm_message_t msg;
366 int error;
367
368 pm_suspend_clear_flags();
369 error = platform_begin(platform_mode);
370 if (error)
371 goto Close;
372
373 /* Preallocate image memory before shutting down devices. */
374 error = hibernate_preallocate_memory();
375 if (error)
376 goto Close;
377
378 error = freeze_kernel_threads();
379 if (error)
380 goto Cleanup;
381
382 if (hibernation_test(TEST_FREEZER)) {
383
384 /*
385 * Indicate to the caller that we are returning due to a
386 * successful freezer test.
387 */
388 freezer_test_done = true;
389 goto Thaw;
390 }
391
392 error = dpm_prepare(PMSG_FREEZE);
393 if (error) {
394 dpm_complete(PMSG_RECOVER);
395 goto Thaw;
396 }
397
398 suspend_console();
399 pm_restrict_gfp_mask();
400
401 error = dpm_suspend(PMSG_FREEZE);
402
403 if (error || hibernation_test(TEST_DEVICES))
404 platform_recover(platform_mode);
405 else
406 error = create_image(platform_mode);
407
408 /*
409 * In the case that we call create_image() above, the control
410 * returns here (1) after the image has been created or the
411 * image creation has failed and (2) after a successful restore.
412 */
413
414 /* We may need to release the preallocated image pages here. */
415 if (error || !in_suspend)
416 swsusp_free();
417
418 msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE;
419 dpm_resume(msg);
420
421 if (error || !in_suspend)
422 pm_restore_gfp_mask();
423
424 resume_console();
425 dpm_complete(msg);
426
427 Close:
428 platform_end(platform_mode);
429 return error;
430
431 Thaw:
432 thaw_kernel_threads();
433 Cleanup:
434 swsusp_free();
435 goto Close;
436}
437
438int __weak hibernate_resume_nonboot_cpu_disable(void)
439{
440 return suspend_disable_secondary_cpus();
441}
442
443/**
444 * resume_target_kernel - Restore system state from a hibernation image.
445 * @platform_mode: Whether or not to use the platform driver.
446 *
447 * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
448 * contents of highmem that have not been restored yet from the image and run
449 * the low-level code that will restore the remaining contents of memory and
450 * switch to the just restored target kernel.
451 */
452static int resume_target_kernel(bool platform_mode)
453{
454 int error;
455
456 error = dpm_suspend_end(PMSG_QUIESCE);
457 if (error) {
458 pr_err("Some devices failed to power down, aborting resume\n");
459 return error;
460 }
461
462 error = platform_pre_restore(platform_mode);
463 if (error)
464 goto Cleanup;
465
466 error = hibernate_resume_nonboot_cpu_disable();
467 if (error)
468 goto Enable_cpus;
469
470 local_irq_disable();
471 system_state = SYSTEM_SUSPEND;
472
473 error = syscore_suspend();
474 if (error)
475 goto Enable_irqs;
476
477 save_processor_state();
478 error = restore_highmem();
479 if (!error) {
480 error = swsusp_arch_resume();
481 /*
482 * The code below is only ever reached in case of a failure.
483 * Otherwise, execution continues at the place where
484 * swsusp_arch_suspend() was called.
485 */
486 BUG_ON(!error);
487 /*
488 * This call to restore_highmem() reverts the changes made by
489 * the previous one.
490 */
491 restore_highmem();
492 }
493 /*
494 * The only reason why swsusp_arch_resume() can fail is memory being
495 * very tight, so we have to free it as soon as we can to avoid
496 * subsequent failures.
497 */
498 swsusp_free();
499 restore_processor_state();
500 touch_softlockup_watchdog();
501
502 syscore_resume();
503
504 Enable_irqs:
505 system_state = SYSTEM_RUNNING;
506 local_irq_enable();
507
508 Enable_cpus:
509 suspend_enable_secondary_cpus();
510
511 Cleanup:
512 platform_restore_cleanup(platform_mode);
513
514 dpm_resume_start(PMSG_RECOVER);
515
516 return error;
517}
518
519/**
520 * hibernation_restore - Quiesce devices and restore from a hibernation image.
521 * @platform_mode: If set, use platform driver to prepare for the transition.
522 *
523 * This routine must be called with system_transition_mutex held. If it is
524 * successful, control reappears in the restored target kernel in
525 * hibernation_snapshot().
526 */
527int hibernation_restore(int platform_mode)
528{
529 int error;
530
531 pm_prepare_console();
532 suspend_console();
533 pm_restrict_gfp_mask();
534 error = dpm_suspend_start(PMSG_QUIESCE);
535 if (!error) {
536 error = resume_target_kernel(platform_mode);
537 /*
538 * The above should either succeed and jump to the new kernel,
539 * or return with an error. Otherwise things are just
540 * undefined, so let's be paranoid.
541 */
542 BUG_ON(!error);
543 }
544 dpm_resume_end(PMSG_RECOVER);
545 pm_restore_gfp_mask();
546 resume_console();
547 pm_restore_console();
548 return error;
549}
550
551/**
552 * hibernation_platform_enter - Power off the system using the platform driver.
553 */
554int hibernation_platform_enter(void)
555{
556 int error;
557
558 if (!hibernation_ops)
559 return -ENOSYS;
560
561 /*
562 * We have cancelled the power transition by running
563 * hibernation_ops->finish() before saving the image, so we should let
564 * the firmware know that we're going to enter the sleep state after all
565 */
566 error = hibernation_ops->begin(PMSG_HIBERNATE);
567 if (error)
568 goto Close;
569
570 entering_platform_hibernation = true;
571 suspend_console();
572 error = dpm_suspend_start(PMSG_HIBERNATE);
573 if (error) {
574 if (hibernation_ops->recover)
575 hibernation_ops->recover();
576 goto Resume_devices;
577 }
578
579 error = dpm_suspend_end(PMSG_HIBERNATE);
580 if (error)
581 goto Resume_devices;
582
583 error = hibernation_ops->prepare();
584 if (error)
585 goto Platform_finish;
586
587 error = suspend_disable_secondary_cpus();
588 if (error)
589 goto Enable_cpus;
590
591 local_irq_disable();
592 system_state = SYSTEM_SUSPEND;
593 syscore_suspend();
594 if (pm_wakeup_pending()) {
595 error = -EAGAIN;
596 goto Power_up;
597 }
598
599 hibernation_ops->enter();
600 /* We should never get here */
601 while (1);
602
603 Power_up:
604 syscore_resume();
605 system_state = SYSTEM_RUNNING;
606 local_irq_enable();
607
608 Enable_cpus:
609 suspend_enable_secondary_cpus();
610
611 Platform_finish:
612 hibernation_ops->finish();
613
614 dpm_resume_start(PMSG_RESTORE);
615
616 Resume_devices:
617 entering_platform_hibernation = false;
618 dpm_resume_end(PMSG_RESTORE);
619 resume_console();
620
621 Close:
622 hibernation_ops->end();
623
624 return error;
625}
626
627/**
628 * power_down - Shut the machine down for hibernation.
629 *
630 * Use the platform driver, if configured, to put the system into the sleep
631 * state corresponding to hibernation, or try to power it off or reboot,
632 * depending on the value of hibernation_mode.
633 */
634static void power_down(void)
635{
636#ifdef CONFIG_SUSPEND
637 int error;
638
639 if (hibernation_mode == HIBERNATION_SUSPEND) {
640 error = suspend_devices_and_enter(PM_SUSPEND_MEM);
641 if (error) {
642 hibernation_mode = hibernation_ops ?
643 HIBERNATION_PLATFORM :
644 HIBERNATION_SHUTDOWN;
645 } else {
646 /* Restore swap signature. */
647 error = swsusp_unmark();
648 if (error)
649 pr_err("Swap will be unusable! Try swapon -a.\n");
650
651 return;
652 }
653 }
654#endif
655
656 switch (hibernation_mode) {
657 case HIBERNATION_REBOOT:
658 kernel_restart(NULL);
659 break;
660 case HIBERNATION_PLATFORM:
661 hibernation_platform_enter();
662 fallthrough;
663 case HIBERNATION_SHUTDOWN:
664 if (pm_power_off)
665 kernel_power_off();
666 break;
667 }
668 kernel_halt();
669 /*
670 * Valid image is on the disk, if we continue we risk serious data
671 * corruption after resume.
672 */
673 pr_crit("Power down manually\n");
674 while (1)
675 cpu_relax();
676}
677
678static int load_image_and_restore(void)
679{
680 int error;
681 unsigned int flags;
682
683 pm_pr_dbg("Loading hibernation image.\n");
684
685 lock_device_hotplug();
686 error = create_basic_memory_bitmaps();
687 if (error)
688 goto Unlock;
689
690 error = swsusp_read(&flags);
691 swsusp_close(FMODE_READ);
692 if (!error)
693 error = hibernation_restore(flags & SF_PLATFORM_MODE);
694
695 pr_err("Failed to load image, recovering.\n");
696 swsusp_free();
697 free_basic_memory_bitmaps();
698 Unlock:
699 unlock_device_hotplug();
700
701 return error;
702}
703
704/**
705 * hibernate - Carry out system hibernation, including saving the image.
706 */
707int hibernate(void)
708{
709 int error, nr_calls = 0;
710 bool snapshot_test = false;
711
712 if (!hibernation_available()) {
713 pm_pr_dbg("Hibernation not available.\n");
714 return -EPERM;
715 }
716
717 lock_system_sleep();
718 /* The snapshot device should not be opened while we're running */
719 if (!hibernate_acquire()) {
720 error = -EBUSY;
721 goto Unlock;
722 }
723
724 pr_info("hibernation entry\n");
725 pm_prepare_console();
726 error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
727 if (error) {
728 nr_calls--;
729 goto Exit;
730 }
731
732 ksys_sync_helper();
733
734 error = freeze_processes();
735 if (error)
736 goto Exit;
737
738 lock_device_hotplug();
739 /* Allocate memory management structures */
740 error = create_basic_memory_bitmaps();
741 if (error)
742 goto Thaw;
743
744 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
745 if (error || freezer_test_done)
746 goto Free_bitmaps;
747
748 if (in_suspend) {
749 unsigned int flags = 0;
750
751 if (hibernation_mode == HIBERNATION_PLATFORM)
752 flags |= SF_PLATFORM_MODE;
753 if (nocompress)
754 flags |= SF_NOCOMPRESS_MODE;
755 else
756 flags |= SF_CRC32_MODE;
757
758 pm_pr_dbg("Writing hibernation image.\n");
759 error = swsusp_write(flags);
760 swsusp_free();
761 if (!error) {
762 if (hibernation_mode == HIBERNATION_TEST_RESUME)
763 snapshot_test = true;
764 else
765 power_down();
766 }
767 in_suspend = 0;
768 pm_restore_gfp_mask();
769 } else {
770 pm_pr_dbg("Hibernation image restored successfully.\n");
771 }
772
773 Free_bitmaps:
774 free_basic_memory_bitmaps();
775 Thaw:
776 unlock_device_hotplug();
777 if (snapshot_test) {
778 pm_pr_dbg("Checking hibernation image\n");
779 error = swsusp_check();
780 if (!error)
781 error = load_image_and_restore();
782 }
783 thaw_processes();
784
785 /* Don't bother checking whether freezer_test_done is true */
786 freezer_test_done = false;
787 Exit:
788 __pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL);
789 pm_restore_console();
790 hibernate_release();
791 Unlock:
792 unlock_system_sleep();
793 pr_info("hibernation exit\n");
794
795 return error;
796}
797
798/**
799 * hibernate_quiet_exec - Execute a function with all devices frozen.
800 * @func: Function to execute.
801 * @data: Data pointer to pass to @func.
802 *
803 * Return the @func return value or an error code if it cannot be executed.
804 */
805int hibernate_quiet_exec(int (*func)(void *data), void *data)
806{
807 int error, nr_calls = 0;
808
809 lock_system_sleep();
810
811 if (!hibernate_acquire()) {
812 error = -EBUSY;
813 goto unlock;
814 }
815
816 pm_prepare_console();
817
818 error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
819 if (error) {
820 nr_calls--;
821 goto exit;
822 }
823
824 error = freeze_processes();
825 if (error)
826 goto exit;
827
828 lock_device_hotplug();
829
830 pm_suspend_clear_flags();
831
832 error = platform_begin(true);
833 if (error)
834 goto thaw;
835
836 error = freeze_kernel_threads();
837 if (error)
838 goto thaw;
839
840 error = dpm_prepare(PMSG_FREEZE);
841 if (error)
842 goto dpm_complete;
843
844 suspend_console();
845
846 error = dpm_suspend(PMSG_FREEZE);
847 if (error)
848 goto dpm_resume;
849
850 error = dpm_suspend_end(PMSG_FREEZE);
851 if (error)
852 goto dpm_resume;
853
854 error = platform_pre_snapshot(true);
855 if (error)
856 goto skip;
857
858 error = func(data);
859
860skip:
861 platform_finish(true);
862
863 dpm_resume_start(PMSG_THAW);
864
865dpm_resume:
866 dpm_resume(PMSG_THAW);
867
868 resume_console();
869
870dpm_complete:
871 dpm_complete(PMSG_THAW);
872
873 thaw_kernel_threads();
874
875thaw:
876 platform_end(true);
877
878 unlock_device_hotplug();
879
880 thaw_processes();
881
882exit:
883 __pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL);
884
885 pm_restore_console();
886
887 hibernate_release();
888
889unlock:
890 unlock_system_sleep();
891
892 return error;
893}
894EXPORT_SYMBOL_GPL(hibernate_quiet_exec);
895
896/**
897 * software_resume - Resume from a saved hibernation image.
898 *
899 * This routine is called as a late initcall, when all devices have been
900 * discovered and initialized already.
901 *
902 * The image reading code is called to see if there is a hibernation image
903 * available for reading. If that is the case, devices are quiesced and the
904 * contents of memory is restored from the saved image.
905 *
906 * If this is successful, control reappears in the restored target kernel in
907 * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
908 * attempts to recover gracefully and make the kernel return to the normal mode
909 * of operation.
910 */
911static int software_resume(void)
912{
913 int error, nr_calls = 0;
914
915 /*
916 * If the user said "noresume".. bail out early.
917 */
918 if (noresume || !hibernation_available())
919 return 0;
920
921 /*
922 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
923 * is configured into the kernel. Since the regular hibernate
924 * trigger path is via sysfs which takes a buffer mutex before
925 * calling hibernate functions (which take system_transition_mutex)
926 * this can cause lockdep to complain about a possible ABBA deadlock
927 * which cannot happen since we're in the boot code here and
928 * sysfs can't be invoked yet. Therefore, we use a subclass
929 * here to avoid lockdep complaining.
930 */
931 mutex_lock_nested(&system_transition_mutex, SINGLE_DEPTH_NESTING);
932
933 if (swsusp_resume_device)
934 goto Check_image;
935
936 if (!strlen(resume_file)) {
937 error = -ENOENT;
938 goto Unlock;
939 }
940
941 pm_pr_dbg("Checking hibernation image partition %s\n", resume_file);
942
943 if (resume_delay) {
944 pr_info("Waiting %dsec before reading resume device ...\n",
945 resume_delay);
946 ssleep(resume_delay);
947 }
948
949 /* Check if the device is there */
950 swsusp_resume_device = name_to_dev_t(resume_file);
951
952 /*
953 * name_to_dev_t is ineffective to verify parition if resume_file is in
954 * integer format. (e.g. major:minor)
955 */
956 if (isdigit(resume_file[0]) && resume_wait) {
957 int partno;
958 while (!get_gendisk(swsusp_resume_device, &partno))
959 msleep(10);
960 }
961
962 if (!swsusp_resume_device) {
963 /*
964 * Some device discovery might still be in progress; we need
965 * to wait for this to finish.
966 */
967 wait_for_device_probe();
968
969 if (resume_wait) {
970 while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
971 msleep(10);
972 async_synchronize_full();
973 }
974
975 swsusp_resume_device = name_to_dev_t(resume_file);
976 if (!swsusp_resume_device) {
977 error = -ENODEV;
978 goto Unlock;
979 }
980 }
981
982 Check_image:
983 pm_pr_dbg("Hibernation image partition %d:%d present\n",
984 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
985
986 pm_pr_dbg("Looking for hibernation image.\n");
987 error = swsusp_check();
988 if (error)
989 goto Unlock;
990
991 /* The snapshot device should not be opened while we're running */
992 if (!hibernate_acquire()) {
993 error = -EBUSY;
994 swsusp_close(FMODE_READ);
995 goto Unlock;
996 }
997
998 pr_info("resume from hibernation\n");
999 pm_prepare_console();
1000 error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls);
1001 if (error) {
1002 nr_calls--;
1003 goto Close_Finish;
1004 }
1005
1006 pm_pr_dbg("Preparing processes for hibernation restore.\n");
1007 error = freeze_processes();
1008 if (error)
1009 goto Close_Finish;
1010
1011 error = freeze_kernel_threads();
1012 if (error) {
1013 thaw_processes();
1014 goto Close_Finish;
1015 }
1016
1017 error = load_image_and_restore();
1018 thaw_processes();
1019 Finish:
1020 __pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
1021 pm_restore_console();
1022 pr_info("resume failed (%d)\n", error);
1023 hibernate_release();
1024 /* For success case, the suspend path will release the lock */
1025 Unlock:
1026 mutex_unlock(&system_transition_mutex);
1027 pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
1028 return error;
1029 Close_Finish:
1030 swsusp_close(FMODE_READ);
1031 goto Finish;
1032}
1033
1034late_initcall_sync(software_resume);
1035
1036
1037static const char * const hibernation_modes[] = {
1038 [HIBERNATION_PLATFORM] = "platform",
1039 [HIBERNATION_SHUTDOWN] = "shutdown",
1040 [HIBERNATION_REBOOT] = "reboot",
1041#ifdef CONFIG_SUSPEND
1042 [HIBERNATION_SUSPEND] = "suspend",
1043#endif
1044 [HIBERNATION_TEST_RESUME] = "test_resume",
1045};
1046
1047/*
1048 * /sys/power/disk - Control hibernation mode.
1049 *
1050 * Hibernation can be handled in several ways. There are a few different ways
1051 * to put the system into the sleep state: using the platform driver (e.g. ACPI
1052 * or other hibernation_ops), powering it off or rebooting it (for testing
1053 * mostly).
1054 *
1055 * The sysfs file /sys/power/disk provides an interface for selecting the
1056 * hibernation mode to use. Reading from this file causes the available modes
1057 * to be printed. There are 3 modes that can be supported:
1058 *
1059 * 'platform'
1060 * 'shutdown'
1061 * 'reboot'
1062 *
1063 * If a platform hibernation driver is in use, 'platform' will be supported
1064 * and will be used by default. Otherwise, 'shutdown' will be used by default.
1065 * The selected option (i.e. the one corresponding to the current value of
1066 * hibernation_mode) is enclosed by a square bracket.
1067 *
1068 * To select a given hibernation mode it is necessary to write the mode's
1069 * string representation (as returned by reading from /sys/power/disk) back
1070 * into /sys/power/disk.
1071 */
1072
1073static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
1074 char *buf)
1075{
1076 int i;
1077 char *start = buf;
1078
1079 if (!hibernation_available())
1080 return sprintf(buf, "[disabled]\n");
1081
1082 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1083 if (!hibernation_modes[i])
1084 continue;
1085 switch (i) {
1086 case HIBERNATION_SHUTDOWN:
1087 case HIBERNATION_REBOOT:
1088#ifdef CONFIG_SUSPEND
1089 case HIBERNATION_SUSPEND:
1090#endif
1091 case HIBERNATION_TEST_RESUME:
1092 break;
1093 case HIBERNATION_PLATFORM:
1094 if (hibernation_ops)
1095 break;
1096 /* not a valid mode, continue with loop */
1097 continue;
1098 }
1099 if (i == hibernation_mode)
1100 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
1101 else
1102 buf += sprintf(buf, "%s ", hibernation_modes[i]);
1103 }
1104 buf += sprintf(buf, "\n");
1105 return buf-start;
1106}
1107
1108static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
1109 const char *buf, size_t n)
1110{
1111 int error = 0;
1112 int i;
1113 int len;
1114 char *p;
1115 int mode = HIBERNATION_INVALID;
1116
1117 if (!hibernation_available())
1118 return -EPERM;
1119
1120 p = memchr(buf, '\n', n);
1121 len = p ? p - buf : n;
1122
1123 lock_system_sleep();
1124 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1125 if (len == strlen(hibernation_modes[i])
1126 && !strncmp(buf, hibernation_modes[i], len)) {
1127 mode = i;
1128 break;
1129 }
1130 }
1131 if (mode != HIBERNATION_INVALID) {
1132 switch (mode) {
1133 case HIBERNATION_SHUTDOWN:
1134 case HIBERNATION_REBOOT:
1135#ifdef CONFIG_SUSPEND
1136 case HIBERNATION_SUSPEND:
1137#endif
1138 case HIBERNATION_TEST_RESUME:
1139 hibernation_mode = mode;
1140 break;
1141 case HIBERNATION_PLATFORM:
1142 if (hibernation_ops)
1143 hibernation_mode = mode;
1144 else
1145 error = -EINVAL;
1146 }
1147 } else
1148 error = -EINVAL;
1149
1150 if (!error)
1151 pm_pr_dbg("Hibernation mode set to '%s'\n",
1152 hibernation_modes[mode]);
1153 unlock_system_sleep();
1154 return error ? error : n;
1155}
1156
1157power_attr(disk);
1158
1159static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
1160 char *buf)
1161{
1162 return sprintf(buf, "%d:%d\n", MAJOR(swsusp_resume_device),
1163 MINOR(swsusp_resume_device));
1164}
1165
1166static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
1167 const char *buf, size_t n)
1168{
1169 dev_t res;
1170 int len = n;
1171 char *name;
1172
1173 if (len && buf[len-1] == '\n')
1174 len--;
1175 name = kstrndup(buf, len, GFP_KERNEL);
1176 if (!name)
1177 return -ENOMEM;
1178
1179 res = name_to_dev_t(name);
1180 kfree(name);
1181 if (!res)
1182 return -EINVAL;
1183
1184 lock_system_sleep();
1185 swsusp_resume_device = res;
1186 unlock_system_sleep();
1187 pm_pr_dbg("Configured hibernation resume from disk to %u\n",
1188 swsusp_resume_device);
1189 noresume = 0;
1190 software_resume();
1191 return n;
1192}
1193
1194power_attr(resume);
1195
1196static ssize_t resume_offset_show(struct kobject *kobj,
1197 struct kobj_attribute *attr, char *buf)
1198{
1199 return sprintf(buf, "%llu\n", (unsigned long long)swsusp_resume_block);
1200}
1201
1202static ssize_t resume_offset_store(struct kobject *kobj,
1203 struct kobj_attribute *attr, const char *buf,
1204 size_t n)
1205{
1206 unsigned long long offset;
1207 int rc;
1208
1209 rc = kstrtoull(buf, 0, &offset);
1210 if (rc)
1211 return rc;
1212 swsusp_resume_block = offset;
1213
1214 return n;
1215}
1216
1217power_attr(resume_offset);
1218
1219static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
1220 char *buf)
1221{
1222 return sprintf(buf, "%lu\n", image_size);
1223}
1224
1225static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
1226 const char *buf, size_t n)
1227{
1228 unsigned long size;
1229
1230 if (sscanf(buf, "%lu", &size) == 1) {
1231 image_size = size;
1232 return n;
1233 }
1234
1235 return -EINVAL;
1236}
1237
1238power_attr(image_size);
1239
1240static ssize_t reserved_size_show(struct kobject *kobj,
1241 struct kobj_attribute *attr, char *buf)
1242{
1243 return sprintf(buf, "%lu\n", reserved_size);
1244}
1245
1246static ssize_t reserved_size_store(struct kobject *kobj,
1247 struct kobj_attribute *attr,
1248 const char *buf, size_t n)
1249{
1250 unsigned long size;
1251
1252 if (sscanf(buf, "%lu", &size) == 1) {
1253 reserved_size = size;
1254 return n;
1255 }
1256
1257 return -EINVAL;
1258}
1259
1260power_attr(reserved_size);
1261
1262static struct attribute *g[] = {
1263 &disk_attr.attr,
1264 &resume_offset_attr.attr,
1265 &resume_attr.attr,
1266 &image_size_attr.attr,
1267 &reserved_size_attr.attr,
1268 NULL,
1269};
1270
1271
1272static const struct attribute_group attr_group = {
1273 .attrs = g,
1274};
1275
1276
1277static int __init pm_disk_init(void)
1278{
1279 return sysfs_create_group(power_kobj, &attr_group);
1280}
1281
1282core_initcall(pm_disk_init);
1283
1284
1285static int __init resume_setup(char *str)
1286{
1287 if (noresume)
1288 return 1;
1289
1290 strncpy(resume_file, str, 255);
1291 return 1;
1292}
1293
1294static int __init resume_offset_setup(char *str)
1295{
1296 unsigned long long offset;
1297
1298 if (noresume)
1299 return 1;
1300
1301 if (sscanf(str, "%llu", &offset) == 1)
1302 swsusp_resume_block = offset;
1303
1304 return 1;
1305}
1306
1307static int __init hibernate_setup(char *str)
1308{
1309 if (!strncmp(str, "noresume", 8)) {
1310 noresume = 1;
1311 } else if (!strncmp(str, "nocompress", 10)) {
1312 nocompress = 1;
1313 } else if (!strncmp(str, "no", 2)) {
1314 noresume = 1;
1315 nohibernate = 1;
1316 } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)
1317 && !strncmp(str, "protect_image", 13)) {
1318 enable_restore_image_protection();
1319 }
1320 return 1;
1321}
1322
1323static int __init noresume_setup(char *str)
1324{
1325 noresume = 1;
1326 return 1;
1327}
1328
1329static int __init resumewait_setup(char *str)
1330{
1331 resume_wait = 1;
1332 return 1;
1333}
1334
1335static int __init resumedelay_setup(char *str)
1336{
1337 int rc = kstrtouint(str, 0, &resume_delay);
1338
1339 if (rc)
1340 return rc;
1341 return 1;
1342}
1343
1344static int __init nohibernate_setup(char *str)
1345{
1346 noresume = 1;
1347 nohibernate = 1;
1348 return 1;
1349}
1350
1351__setup("noresume", noresume_setup);
1352__setup("resume_offset=", resume_offset_setup);
1353__setup("resume=", resume_setup);
1354__setup("hibernate=", hibernate_setup);
1355__setup("resumewait", resumewait_setup);
1356__setup("resumedelay=", resumedelay_setup);
1357__setup("nohibernate", nohibernate_setup);
1/*
2 * kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support.
3 *
4 * Copyright (c) 2003 Patrick Mochel
5 * Copyright (c) 2003 Open Source Development Lab
6 * Copyright (c) 2004 Pavel Machek <pavel@ucw.cz>
7 * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.
8 * Copyright (C) 2012 Bojan Smojver <bojan@rexursive.com>
9 *
10 * This file is released under the GPLv2.
11 */
12
13#include <linux/export.h>
14#include <linux/suspend.h>
15#include <linux/syscalls.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/console.h>
25#include <linux/cpu.h>
26#include <linux/freezer.h>
27#include <linux/gfp.h>
28#include <linux/syscore_ops.h>
29#include <linux/ctype.h>
30#include <linux/genhd.h>
31#include <linux/ktime.h>
32#include <trace/events/power.h>
33
34#include "power.h"
35
36
37static int nocompress;
38static int noresume;
39static int nohibernate;
40static int resume_wait;
41static unsigned int resume_delay;
42static char resume_file[256] = CONFIG_PM_STD_PARTITION;
43dev_t swsusp_resume_device;
44sector_t swsusp_resume_block;
45__visible int in_suspend __nosavedata;
46
47enum {
48 HIBERNATION_INVALID,
49 HIBERNATION_PLATFORM,
50 HIBERNATION_SHUTDOWN,
51 HIBERNATION_REBOOT,
52#ifdef CONFIG_SUSPEND
53 HIBERNATION_SUSPEND,
54#endif
55 HIBERNATION_TEST_RESUME,
56 /* keep last */
57 __HIBERNATION_AFTER_LAST
58};
59#define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
60#define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
61
62static int hibernation_mode = HIBERNATION_SHUTDOWN;
63
64bool freezer_test_done;
65
66static const struct platform_hibernation_ops *hibernation_ops;
67
68bool hibernation_available(void)
69{
70 return (nohibernate == 0);
71}
72
73/**
74 * hibernation_set_ops - Set the global hibernate operations.
75 * @ops: Hibernation operations to use in subsequent hibernation transitions.
76 */
77void hibernation_set_ops(const struct platform_hibernation_ops *ops)
78{
79 if (ops && !(ops->begin && ops->end && ops->pre_snapshot
80 && ops->prepare && ops->finish && ops->enter && ops->pre_restore
81 && ops->restore_cleanup && ops->leave)) {
82 WARN_ON(1);
83 return;
84 }
85 lock_system_sleep();
86 hibernation_ops = ops;
87 if (ops)
88 hibernation_mode = HIBERNATION_PLATFORM;
89 else if (hibernation_mode == HIBERNATION_PLATFORM)
90 hibernation_mode = HIBERNATION_SHUTDOWN;
91
92 unlock_system_sleep();
93}
94EXPORT_SYMBOL_GPL(hibernation_set_ops);
95
96static bool entering_platform_hibernation;
97
98bool system_entering_hibernation(void)
99{
100 return entering_platform_hibernation;
101}
102EXPORT_SYMBOL(system_entering_hibernation);
103
104#ifdef CONFIG_PM_DEBUG
105static void hibernation_debug_sleep(void)
106{
107 printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n");
108 mdelay(5000);
109}
110
111static int hibernation_test(int level)
112{
113 if (pm_test_level == level) {
114 hibernation_debug_sleep();
115 return 1;
116 }
117 return 0;
118}
119#else /* !CONFIG_PM_DEBUG */
120static int hibernation_test(int level) { return 0; }
121#endif /* !CONFIG_PM_DEBUG */
122
123/**
124 * platform_begin - Call platform to start hibernation.
125 * @platform_mode: Whether or not to use the platform driver.
126 */
127static int platform_begin(int platform_mode)
128{
129 return (platform_mode && hibernation_ops) ?
130 hibernation_ops->begin() : 0;
131}
132
133/**
134 * platform_end - Call platform to finish transition to the working state.
135 * @platform_mode: Whether or not to use the platform driver.
136 */
137static void platform_end(int platform_mode)
138{
139 if (platform_mode && hibernation_ops)
140 hibernation_ops->end();
141}
142
143/**
144 * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
145 * @platform_mode: Whether or not to use the platform driver.
146 *
147 * Use the platform driver to prepare the system for creating a hibernate image,
148 * if so configured, and return an error code if that fails.
149 */
150
151static int platform_pre_snapshot(int platform_mode)
152{
153 return (platform_mode && hibernation_ops) ?
154 hibernation_ops->pre_snapshot() : 0;
155}
156
157/**
158 * platform_leave - Call platform to prepare a transition to the working state.
159 * @platform_mode: Whether or not to use the platform driver.
160 *
161 * Use the platform driver prepare to prepare the machine for switching to the
162 * normal mode of operation.
163 *
164 * This routine is called on one CPU with interrupts disabled.
165 */
166static void platform_leave(int platform_mode)
167{
168 if (platform_mode && hibernation_ops)
169 hibernation_ops->leave();
170}
171
172/**
173 * platform_finish - Call platform to switch the system to the working state.
174 * @platform_mode: Whether or not to use the platform driver.
175 *
176 * Use the platform driver to switch the machine to the normal mode of
177 * operation.
178 *
179 * This routine must be called after platform_prepare().
180 */
181static void platform_finish(int platform_mode)
182{
183 if (platform_mode && hibernation_ops)
184 hibernation_ops->finish();
185}
186
187/**
188 * platform_pre_restore - Prepare for hibernate image restoration.
189 * @platform_mode: Whether or not to use the platform driver.
190 *
191 * Use the platform driver to prepare the system for resume from a hibernation
192 * image.
193 *
194 * If the restore fails after this function has been called,
195 * platform_restore_cleanup() must be called.
196 */
197static int platform_pre_restore(int platform_mode)
198{
199 return (platform_mode && hibernation_ops) ?
200 hibernation_ops->pre_restore() : 0;
201}
202
203/**
204 * platform_restore_cleanup - Switch to the working state after failing restore.
205 * @platform_mode: Whether or not to use the platform driver.
206 *
207 * Use the platform driver to switch the system to the normal mode of operation
208 * after a failing restore.
209 *
210 * If platform_pre_restore() has been called before the failing restore, this
211 * function must be called too, regardless of the result of
212 * platform_pre_restore().
213 */
214static void platform_restore_cleanup(int platform_mode)
215{
216 if (platform_mode && hibernation_ops)
217 hibernation_ops->restore_cleanup();
218}
219
220/**
221 * platform_recover - Recover from a failure to suspend devices.
222 * @platform_mode: Whether or not to use the platform driver.
223 */
224static void platform_recover(int platform_mode)
225{
226 if (platform_mode && hibernation_ops && hibernation_ops->recover)
227 hibernation_ops->recover();
228}
229
230/**
231 * swsusp_show_speed - Print time elapsed between two events during hibernation.
232 * @start: Starting event.
233 * @stop: Final event.
234 * @nr_pages: Number of memory pages processed between @start and @stop.
235 * @msg: Additional diagnostic message to print.
236 */
237void swsusp_show_speed(ktime_t start, ktime_t stop,
238 unsigned nr_pages, char *msg)
239{
240 ktime_t diff;
241 u64 elapsed_centisecs64;
242 unsigned int centisecs;
243 unsigned int k;
244 unsigned int kps;
245
246 diff = ktime_sub(stop, start);
247 elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC);
248 centisecs = elapsed_centisecs64;
249 if (centisecs == 0)
250 centisecs = 1; /* avoid div-by-zero */
251 k = nr_pages * (PAGE_SIZE / 1024);
252 kps = (k * 100) / centisecs;
253 printk(KERN_INFO "PM: %s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n",
254 msg, k,
255 centisecs / 100, centisecs % 100,
256 kps / 1000, (kps % 1000) / 10);
257}
258
259/**
260 * create_image - Create a hibernation image.
261 * @platform_mode: Whether or not to use the platform driver.
262 *
263 * Execute device drivers' "late" and "noirq" freeze callbacks, create a
264 * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
265 *
266 * Control reappears in this routine after the subsequent restore.
267 */
268static int create_image(int platform_mode)
269{
270 int error;
271
272 error = dpm_suspend_end(PMSG_FREEZE);
273 if (error) {
274 printk(KERN_ERR "PM: Some devices failed to power down, "
275 "aborting hibernation\n");
276 return error;
277 }
278
279 error = platform_pre_snapshot(platform_mode);
280 if (error || hibernation_test(TEST_PLATFORM))
281 goto Platform_finish;
282
283 error = disable_nonboot_cpus();
284 if (error || hibernation_test(TEST_CPUS))
285 goto Enable_cpus;
286
287 local_irq_disable();
288
289 error = syscore_suspend();
290 if (error) {
291 printk(KERN_ERR "PM: Some system devices failed to power down, "
292 "aborting hibernation\n");
293 goto Enable_irqs;
294 }
295
296 if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
297 goto Power_up;
298
299 in_suspend = 1;
300 save_processor_state();
301 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
302 error = swsusp_arch_suspend();
303 /* Restore control flow magically appears here */
304 restore_processor_state();
305 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
306 if (error)
307 printk(KERN_ERR "PM: Error %d creating hibernation image\n",
308 error);
309 if (!in_suspend) {
310 events_check_enabled = false;
311 clear_free_pages();
312 }
313
314 platform_leave(platform_mode);
315
316 Power_up:
317 syscore_resume();
318
319 Enable_irqs:
320 local_irq_enable();
321
322 Enable_cpus:
323 enable_nonboot_cpus();
324
325 Platform_finish:
326 platform_finish(platform_mode);
327
328 dpm_resume_start(in_suspend ?
329 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
330
331 return error;
332}
333
334/**
335 * hibernation_snapshot - Quiesce devices and create a hibernation image.
336 * @platform_mode: If set, use platform driver to prepare for the transition.
337 *
338 * This routine must be called with pm_mutex held.
339 */
340int hibernation_snapshot(int platform_mode)
341{
342 pm_message_t msg;
343 int error;
344
345 pm_suspend_clear_flags();
346 error = platform_begin(platform_mode);
347 if (error)
348 goto Close;
349
350 /* Preallocate image memory before shutting down devices. */
351 error = hibernate_preallocate_memory();
352 if (error)
353 goto Close;
354
355 error = freeze_kernel_threads();
356 if (error)
357 goto Cleanup;
358
359 if (hibernation_test(TEST_FREEZER)) {
360
361 /*
362 * Indicate to the caller that we are returning due to a
363 * successful freezer test.
364 */
365 freezer_test_done = true;
366 goto Thaw;
367 }
368
369 error = dpm_prepare(PMSG_FREEZE);
370 if (error) {
371 dpm_complete(PMSG_RECOVER);
372 goto Thaw;
373 }
374
375 suspend_console();
376 pm_restrict_gfp_mask();
377
378 error = dpm_suspend(PMSG_FREEZE);
379
380 if (error || hibernation_test(TEST_DEVICES))
381 platform_recover(platform_mode);
382 else
383 error = create_image(platform_mode);
384
385 /*
386 * In the case that we call create_image() above, the control
387 * returns here (1) after the image has been created or the
388 * image creation has failed and (2) after a successful restore.
389 */
390
391 /* We may need to release the preallocated image pages here. */
392 if (error || !in_suspend)
393 swsusp_free();
394
395 msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE;
396 dpm_resume(msg);
397
398 if (error || !in_suspend)
399 pm_restore_gfp_mask();
400
401 resume_console();
402 dpm_complete(msg);
403
404 Close:
405 platform_end(platform_mode);
406 return error;
407
408 Thaw:
409 thaw_kernel_threads();
410 Cleanup:
411 swsusp_free();
412 goto Close;
413}
414
415int __weak hibernate_resume_nonboot_cpu_disable(void)
416{
417 return disable_nonboot_cpus();
418}
419
420/**
421 * resume_target_kernel - Restore system state from a hibernation image.
422 * @platform_mode: Whether or not to use the platform driver.
423 *
424 * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
425 * contents of highmem that have not been restored yet from the image and run
426 * the low-level code that will restore the remaining contents of memory and
427 * switch to the just restored target kernel.
428 */
429static int resume_target_kernel(bool platform_mode)
430{
431 int error;
432
433 error = dpm_suspend_end(PMSG_QUIESCE);
434 if (error) {
435 printk(KERN_ERR "PM: Some devices failed to power down, "
436 "aborting resume\n");
437 return error;
438 }
439
440 error = platform_pre_restore(platform_mode);
441 if (error)
442 goto Cleanup;
443
444 error = hibernate_resume_nonboot_cpu_disable();
445 if (error)
446 goto Enable_cpus;
447
448 local_irq_disable();
449
450 error = syscore_suspend();
451 if (error)
452 goto Enable_irqs;
453
454 save_processor_state();
455 error = restore_highmem();
456 if (!error) {
457 error = swsusp_arch_resume();
458 /*
459 * The code below is only ever reached in case of a failure.
460 * Otherwise, execution continues at the place where
461 * swsusp_arch_suspend() was called.
462 */
463 BUG_ON(!error);
464 /*
465 * This call to restore_highmem() reverts the changes made by
466 * the previous one.
467 */
468 restore_highmem();
469 }
470 /*
471 * The only reason why swsusp_arch_resume() can fail is memory being
472 * very tight, so we have to free it as soon as we can to avoid
473 * subsequent failures.
474 */
475 swsusp_free();
476 restore_processor_state();
477 touch_softlockup_watchdog();
478
479 syscore_resume();
480
481 Enable_irqs:
482 local_irq_enable();
483
484 Enable_cpus:
485 enable_nonboot_cpus();
486
487 Cleanup:
488 platform_restore_cleanup(platform_mode);
489
490 dpm_resume_start(PMSG_RECOVER);
491
492 return error;
493}
494
495/**
496 * hibernation_restore - Quiesce devices and restore from a hibernation image.
497 * @platform_mode: If set, use platform driver to prepare for the transition.
498 *
499 * This routine must be called with pm_mutex held. If it is successful, control
500 * reappears in the restored target kernel in hibernation_snapshot().
501 */
502int hibernation_restore(int platform_mode)
503{
504 int error;
505
506 pm_prepare_console();
507 suspend_console();
508 pm_restrict_gfp_mask();
509 error = dpm_suspend_start(PMSG_QUIESCE);
510 if (!error) {
511 error = resume_target_kernel(platform_mode);
512 /*
513 * The above should either succeed and jump to the new kernel,
514 * or return with an error. Otherwise things are just
515 * undefined, so let's be paranoid.
516 */
517 BUG_ON(!error);
518 }
519 dpm_resume_end(PMSG_RECOVER);
520 pm_restore_gfp_mask();
521 resume_console();
522 pm_restore_console();
523 return error;
524}
525
526/**
527 * hibernation_platform_enter - Power off the system using the platform driver.
528 */
529int hibernation_platform_enter(void)
530{
531 int error;
532
533 if (!hibernation_ops)
534 return -ENOSYS;
535
536 /*
537 * We have cancelled the power transition by running
538 * hibernation_ops->finish() before saving the image, so we should let
539 * the firmware know that we're going to enter the sleep state after all
540 */
541 error = hibernation_ops->begin();
542 if (error)
543 goto Close;
544
545 entering_platform_hibernation = true;
546 suspend_console();
547 error = dpm_suspend_start(PMSG_HIBERNATE);
548 if (error) {
549 if (hibernation_ops->recover)
550 hibernation_ops->recover();
551 goto Resume_devices;
552 }
553
554 error = dpm_suspend_end(PMSG_HIBERNATE);
555 if (error)
556 goto Resume_devices;
557
558 error = hibernation_ops->prepare();
559 if (error)
560 goto Platform_finish;
561
562 error = disable_nonboot_cpus();
563 if (error)
564 goto Enable_cpus;
565
566 local_irq_disable();
567 syscore_suspend();
568 if (pm_wakeup_pending()) {
569 error = -EAGAIN;
570 goto Power_up;
571 }
572
573 hibernation_ops->enter();
574 /* We should never get here */
575 while (1);
576
577 Power_up:
578 syscore_resume();
579 local_irq_enable();
580
581 Enable_cpus:
582 enable_nonboot_cpus();
583
584 Platform_finish:
585 hibernation_ops->finish();
586
587 dpm_resume_start(PMSG_RESTORE);
588
589 Resume_devices:
590 entering_platform_hibernation = false;
591 dpm_resume_end(PMSG_RESTORE);
592 resume_console();
593
594 Close:
595 hibernation_ops->end();
596
597 return error;
598}
599
600/**
601 * power_down - Shut the machine down for hibernation.
602 *
603 * Use the platform driver, if configured, to put the system into the sleep
604 * state corresponding to hibernation, or try to power it off or reboot,
605 * depending on the value of hibernation_mode.
606 */
607static void power_down(void)
608{
609#ifdef CONFIG_SUSPEND
610 int error;
611#endif
612
613 switch (hibernation_mode) {
614 case HIBERNATION_REBOOT:
615 kernel_restart(NULL);
616 break;
617 case HIBERNATION_PLATFORM:
618 hibernation_platform_enter();
619 case HIBERNATION_SHUTDOWN:
620 if (pm_power_off)
621 kernel_power_off();
622 break;
623#ifdef CONFIG_SUSPEND
624 case HIBERNATION_SUSPEND:
625 error = suspend_devices_and_enter(PM_SUSPEND_MEM);
626 if (error) {
627 if (hibernation_ops)
628 hibernation_mode = HIBERNATION_PLATFORM;
629 else
630 hibernation_mode = HIBERNATION_SHUTDOWN;
631 power_down();
632 }
633 /*
634 * Restore swap signature.
635 */
636 error = swsusp_unmark();
637 if (error)
638 printk(KERN_ERR "PM: Swap will be unusable! "
639 "Try swapon -a.\n");
640 return;
641#endif
642 }
643 kernel_halt();
644 /*
645 * Valid image is on the disk, if we continue we risk serious data
646 * corruption after resume.
647 */
648 printk(KERN_CRIT "PM: Please power down manually\n");
649 while (1)
650 cpu_relax();
651}
652
653static int load_image_and_restore(void)
654{
655 int error;
656 unsigned int flags;
657
658 pr_debug("PM: Loading hibernation image.\n");
659
660 lock_device_hotplug();
661 error = create_basic_memory_bitmaps();
662 if (error)
663 goto Unlock;
664
665 error = swsusp_read(&flags);
666 swsusp_close(FMODE_READ);
667 if (!error)
668 hibernation_restore(flags & SF_PLATFORM_MODE);
669
670 printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n");
671 swsusp_free();
672 free_basic_memory_bitmaps();
673 Unlock:
674 unlock_device_hotplug();
675
676 return error;
677}
678
679/**
680 * hibernate - Carry out system hibernation, including saving the image.
681 */
682int hibernate(void)
683{
684 int error, nr_calls = 0;
685 bool snapshot_test = false;
686
687 if (!hibernation_available()) {
688 pr_debug("PM: Hibernation not available.\n");
689 return -EPERM;
690 }
691
692 lock_system_sleep();
693 /* The snapshot device should not be opened while we're running */
694 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
695 error = -EBUSY;
696 goto Unlock;
697 }
698
699 pm_prepare_console();
700 error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
701 if (error) {
702 nr_calls--;
703 goto Exit;
704 }
705
706 printk(KERN_INFO "PM: Syncing filesystems ... ");
707 sys_sync();
708 printk("done.\n");
709
710 error = freeze_processes();
711 if (error)
712 goto Exit;
713
714 lock_device_hotplug();
715 /* Allocate memory management structures */
716 error = create_basic_memory_bitmaps();
717 if (error)
718 goto Thaw;
719
720 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
721 if (error || freezer_test_done)
722 goto Free_bitmaps;
723
724 if (in_suspend) {
725 unsigned int flags = 0;
726
727 if (hibernation_mode == HIBERNATION_PLATFORM)
728 flags |= SF_PLATFORM_MODE;
729 if (nocompress)
730 flags |= SF_NOCOMPRESS_MODE;
731 else
732 flags |= SF_CRC32_MODE;
733
734 pr_debug("PM: writing image.\n");
735 error = swsusp_write(flags);
736 swsusp_free();
737 if (!error) {
738 if (hibernation_mode == HIBERNATION_TEST_RESUME)
739 snapshot_test = true;
740 else
741 power_down();
742 }
743 in_suspend = 0;
744 pm_restore_gfp_mask();
745 } else {
746 pr_debug("PM: Image restored successfully.\n");
747 }
748
749 Free_bitmaps:
750 free_basic_memory_bitmaps();
751 Thaw:
752 unlock_device_hotplug();
753 if (snapshot_test) {
754 pr_debug("PM: Checking hibernation image\n");
755 error = swsusp_check();
756 if (!error)
757 error = load_image_and_restore();
758 }
759 thaw_processes();
760
761 /* Don't bother checking whether freezer_test_done is true */
762 freezer_test_done = false;
763 Exit:
764 __pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL);
765 pm_restore_console();
766 atomic_inc(&snapshot_device_available);
767 Unlock:
768 unlock_system_sleep();
769 return error;
770}
771
772
773/**
774 * software_resume - Resume from a saved hibernation image.
775 *
776 * This routine is called as a late initcall, when all devices have been
777 * discovered and initialized already.
778 *
779 * The image reading code is called to see if there is a hibernation image
780 * available for reading. If that is the case, devices are quiesced and the
781 * contents of memory is restored from the saved image.
782 *
783 * If this is successful, control reappears in the restored target kernel in
784 * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
785 * attempts to recover gracefully and make the kernel return to the normal mode
786 * of operation.
787 */
788static int software_resume(void)
789{
790 int error, nr_calls = 0;
791
792 /*
793 * If the user said "noresume".. bail out early.
794 */
795 if (noresume || !hibernation_available())
796 return 0;
797
798 /*
799 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
800 * is configured into the kernel. Since the regular hibernate
801 * trigger path is via sysfs which takes a buffer mutex before
802 * calling hibernate functions (which take pm_mutex) this can
803 * cause lockdep to complain about a possible ABBA deadlock
804 * which cannot happen since we're in the boot code here and
805 * sysfs can't be invoked yet. Therefore, we use a subclass
806 * here to avoid lockdep complaining.
807 */
808 mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING);
809
810 if (swsusp_resume_device)
811 goto Check_image;
812
813 if (!strlen(resume_file)) {
814 error = -ENOENT;
815 goto Unlock;
816 }
817
818 pr_debug("PM: Checking hibernation image partition %s\n", resume_file);
819
820 if (resume_delay) {
821 printk(KERN_INFO "Waiting %dsec before reading resume device...\n",
822 resume_delay);
823 ssleep(resume_delay);
824 }
825
826 /* Check if the device is there */
827 swsusp_resume_device = name_to_dev_t(resume_file);
828
829 /*
830 * name_to_dev_t is ineffective to verify parition if resume_file is in
831 * integer format. (e.g. major:minor)
832 */
833 if (isdigit(resume_file[0]) && resume_wait) {
834 int partno;
835 while (!get_gendisk(swsusp_resume_device, &partno))
836 msleep(10);
837 }
838
839 if (!swsusp_resume_device) {
840 /*
841 * Some device discovery might still be in progress; we need
842 * to wait for this to finish.
843 */
844 wait_for_device_probe();
845
846 if (resume_wait) {
847 while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
848 msleep(10);
849 async_synchronize_full();
850 }
851
852 swsusp_resume_device = name_to_dev_t(resume_file);
853 if (!swsusp_resume_device) {
854 error = -ENODEV;
855 goto Unlock;
856 }
857 }
858
859 Check_image:
860 pr_debug("PM: Hibernation image partition %d:%d present\n",
861 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
862
863 pr_debug("PM: Looking for hibernation image.\n");
864 error = swsusp_check();
865 if (error)
866 goto Unlock;
867
868 /* The snapshot device should not be opened while we're running */
869 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
870 error = -EBUSY;
871 swsusp_close(FMODE_READ);
872 goto Unlock;
873 }
874
875 pm_prepare_console();
876 error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls);
877 if (error) {
878 nr_calls--;
879 goto Close_Finish;
880 }
881
882 pr_debug("PM: Preparing processes for restore.\n");
883 error = freeze_processes();
884 if (error)
885 goto Close_Finish;
886 error = load_image_and_restore();
887 thaw_processes();
888 Finish:
889 __pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
890 pm_restore_console();
891 atomic_inc(&snapshot_device_available);
892 /* For success case, the suspend path will release the lock */
893 Unlock:
894 mutex_unlock(&pm_mutex);
895 pr_debug("PM: Hibernation image not present or could not be loaded.\n");
896 return error;
897 Close_Finish:
898 swsusp_close(FMODE_READ);
899 goto Finish;
900}
901
902late_initcall_sync(software_resume);
903
904
905static const char * const hibernation_modes[] = {
906 [HIBERNATION_PLATFORM] = "platform",
907 [HIBERNATION_SHUTDOWN] = "shutdown",
908 [HIBERNATION_REBOOT] = "reboot",
909#ifdef CONFIG_SUSPEND
910 [HIBERNATION_SUSPEND] = "suspend",
911#endif
912 [HIBERNATION_TEST_RESUME] = "test_resume",
913};
914
915/*
916 * /sys/power/disk - Control hibernation mode.
917 *
918 * Hibernation can be handled in several ways. There are a few different ways
919 * to put the system into the sleep state: using the platform driver (e.g. ACPI
920 * or other hibernation_ops), powering it off or rebooting it (for testing
921 * mostly).
922 *
923 * The sysfs file /sys/power/disk provides an interface for selecting the
924 * hibernation mode to use. Reading from this file causes the available modes
925 * to be printed. There are 3 modes that can be supported:
926 *
927 * 'platform'
928 * 'shutdown'
929 * 'reboot'
930 *
931 * If a platform hibernation driver is in use, 'platform' will be supported
932 * and will be used by default. Otherwise, 'shutdown' will be used by default.
933 * The selected option (i.e. the one corresponding to the current value of
934 * hibernation_mode) is enclosed by a square bracket.
935 *
936 * To select a given hibernation mode it is necessary to write the mode's
937 * string representation (as returned by reading from /sys/power/disk) back
938 * into /sys/power/disk.
939 */
940
941static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
942 char *buf)
943{
944 int i;
945 char *start = buf;
946
947 if (!hibernation_available())
948 return sprintf(buf, "[disabled]\n");
949
950 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
951 if (!hibernation_modes[i])
952 continue;
953 switch (i) {
954 case HIBERNATION_SHUTDOWN:
955 case HIBERNATION_REBOOT:
956#ifdef CONFIG_SUSPEND
957 case HIBERNATION_SUSPEND:
958#endif
959 case HIBERNATION_TEST_RESUME:
960 break;
961 case HIBERNATION_PLATFORM:
962 if (hibernation_ops)
963 break;
964 /* not a valid mode, continue with loop */
965 continue;
966 }
967 if (i == hibernation_mode)
968 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
969 else
970 buf += sprintf(buf, "%s ", hibernation_modes[i]);
971 }
972 buf += sprintf(buf, "\n");
973 return buf-start;
974}
975
976static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
977 const char *buf, size_t n)
978{
979 int error = 0;
980 int i;
981 int len;
982 char *p;
983 int mode = HIBERNATION_INVALID;
984
985 if (!hibernation_available())
986 return -EPERM;
987
988 p = memchr(buf, '\n', n);
989 len = p ? p - buf : n;
990
991 lock_system_sleep();
992 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
993 if (len == strlen(hibernation_modes[i])
994 && !strncmp(buf, hibernation_modes[i], len)) {
995 mode = i;
996 break;
997 }
998 }
999 if (mode != HIBERNATION_INVALID) {
1000 switch (mode) {
1001 case HIBERNATION_SHUTDOWN:
1002 case HIBERNATION_REBOOT:
1003#ifdef CONFIG_SUSPEND
1004 case HIBERNATION_SUSPEND:
1005#endif
1006 case HIBERNATION_TEST_RESUME:
1007 hibernation_mode = mode;
1008 break;
1009 case HIBERNATION_PLATFORM:
1010 if (hibernation_ops)
1011 hibernation_mode = mode;
1012 else
1013 error = -EINVAL;
1014 }
1015 } else
1016 error = -EINVAL;
1017
1018 if (!error)
1019 pr_debug("PM: Hibernation mode set to '%s'\n",
1020 hibernation_modes[mode]);
1021 unlock_system_sleep();
1022 return error ? error : n;
1023}
1024
1025power_attr(disk);
1026
1027static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
1028 char *buf)
1029{
1030 return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
1031 MINOR(swsusp_resume_device));
1032}
1033
1034static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
1035 const char *buf, size_t n)
1036{
1037 dev_t res;
1038 int len = n;
1039 char *name;
1040
1041 if (len && buf[len-1] == '\n')
1042 len--;
1043 name = kstrndup(buf, len, GFP_KERNEL);
1044 if (!name)
1045 return -ENOMEM;
1046
1047 res = name_to_dev_t(name);
1048 kfree(name);
1049 if (!res)
1050 return -EINVAL;
1051
1052 lock_system_sleep();
1053 swsusp_resume_device = res;
1054 unlock_system_sleep();
1055 printk(KERN_INFO "PM: Starting manual resume from disk\n");
1056 noresume = 0;
1057 software_resume();
1058 return n;
1059}
1060
1061power_attr(resume);
1062
1063static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
1064 char *buf)
1065{
1066 return sprintf(buf, "%lu\n", image_size);
1067}
1068
1069static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
1070 const char *buf, size_t n)
1071{
1072 unsigned long size;
1073
1074 if (sscanf(buf, "%lu", &size) == 1) {
1075 image_size = size;
1076 return n;
1077 }
1078
1079 return -EINVAL;
1080}
1081
1082power_attr(image_size);
1083
1084static ssize_t reserved_size_show(struct kobject *kobj,
1085 struct kobj_attribute *attr, char *buf)
1086{
1087 return sprintf(buf, "%lu\n", reserved_size);
1088}
1089
1090static ssize_t reserved_size_store(struct kobject *kobj,
1091 struct kobj_attribute *attr,
1092 const char *buf, size_t n)
1093{
1094 unsigned long size;
1095
1096 if (sscanf(buf, "%lu", &size) == 1) {
1097 reserved_size = size;
1098 return n;
1099 }
1100
1101 return -EINVAL;
1102}
1103
1104power_attr(reserved_size);
1105
1106static struct attribute * g[] = {
1107 &disk_attr.attr,
1108 &resume_attr.attr,
1109 &image_size_attr.attr,
1110 &reserved_size_attr.attr,
1111 NULL,
1112};
1113
1114
1115static struct attribute_group attr_group = {
1116 .attrs = g,
1117};
1118
1119
1120static int __init pm_disk_init(void)
1121{
1122 return sysfs_create_group(power_kobj, &attr_group);
1123}
1124
1125core_initcall(pm_disk_init);
1126
1127
1128static int __init resume_setup(char *str)
1129{
1130 if (noresume)
1131 return 1;
1132
1133 strncpy( resume_file, str, 255 );
1134 return 1;
1135}
1136
1137static int __init resume_offset_setup(char *str)
1138{
1139 unsigned long long offset;
1140
1141 if (noresume)
1142 return 1;
1143
1144 if (sscanf(str, "%llu", &offset) == 1)
1145 swsusp_resume_block = offset;
1146
1147 return 1;
1148}
1149
1150static int __init hibernate_setup(char *str)
1151{
1152 if (!strncmp(str, "noresume", 8)) {
1153 noresume = 1;
1154 } else if (!strncmp(str, "nocompress", 10)) {
1155 nocompress = 1;
1156 } else if (!strncmp(str, "no", 2)) {
1157 noresume = 1;
1158 nohibernate = 1;
1159 } else if (IS_ENABLED(CONFIG_DEBUG_RODATA)
1160 && !strncmp(str, "protect_image", 13)) {
1161 enable_restore_image_protection();
1162 }
1163 return 1;
1164}
1165
1166static int __init noresume_setup(char *str)
1167{
1168 noresume = 1;
1169 return 1;
1170}
1171
1172static int __init resumewait_setup(char *str)
1173{
1174 resume_wait = 1;
1175 return 1;
1176}
1177
1178static int __init resumedelay_setup(char *str)
1179{
1180 int rc = kstrtouint(str, 0, &resume_delay);
1181
1182 if (rc)
1183 return rc;
1184 return 1;
1185}
1186
1187static int __init nohibernate_setup(char *str)
1188{
1189 noresume = 1;
1190 nohibernate = 1;
1191 return 1;
1192}
1193
1194__setup("noresume", noresume_setup);
1195__setup("resume_offset=", resume_offset_setup);
1196__setup("resume=", resume_setup);
1197__setup("hibernate=", hibernate_setup);
1198__setup("resumewait", resumewait_setup);
1199__setup("resumedelay=", resumedelay_setup);
1200__setup("nohibernate", nohibernate_setup);