Loading...
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/ktime.h>
32#include <linux/security.h>
33#include <linux/secretmem.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 &&
85 !security_locked_down(LOCKDOWN_HIBERNATION) &&
86 !secretmem_active() && !cxl_mem_active();
87}
88
89/**
90 * hibernation_set_ops - Set the global hibernate operations.
91 * @ops: Hibernation operations to use in subsequent hibernation transitions.
92 */
93void hibernation_set_ops(const struct platform_hibernation_ops *ops)
94{
95 unsigned int sleep_flags;
96
97 if (ops && !(ops->begin && ops->end && ops->pre_snapshot
98 && ops->prepare && ops->finish && ops->enter && ops->pre_restore
99 && ops->restore_cleanup && ops->leave)) {
100 WARN_ON(1);
101 return;
102 }
103
104 sleep_flags = lock_system_sleep();
105
106 hibernation_ops = ops;
107 if (ops)
108 hibernation_mode = HIBERNATION_PLATFORM;
109 else if (hibernation_mode == HIBERNATION_PLATFORM)
110 hibernation_mode = HIBERNATION_SHUTDOWN;
111
112 unlock_system_sleep(sleep_flags);
113}
114EXPORT_SYMBOL_GPL(hibernation_set_ops);
115
116static bool entering_platform_hibernation;
117
118bool system_entering_hibernation(void)
119{
120 return entering_platform_hibernation;
121}
122EXPORT_SYMBOL(system_entering_hibernation);
123
124#ifdef CONFIG_PM_DEBUG
125static void hibernation_debug_sleep(void)
126{
127 pr_info("debug: Waiting for 5 seconds.\n");
128 mdelay(5000);
129}
130
131static int hibernation_test(int level)
132{
133 if (pm_test_level == level) {
134 hibernation_debug_sleep();
135 return 1;
136 }
137 return 0;
138}
139#else /* !CONFIG_PM_DEBUG */
140static int hibernation_test(int level) { return 0; }
141#endif /* !CONFIG_PM_DEBUG */
142
143/**
144 * platform_begin - Call platform to start hibernation.
145 * @platform_mode: Whether or not to use the platform driver.
146 */
147static int platform_begin(int platform_mode)
148{
149 return (platform_mode && hibernation_ops) ?
150 hibernation_ops->begin(PMSG_FREEZE) : 0;
151}
152
153/**
154 * platform_end - Call platform to finish transition to the working state.
155 * @platform_mode: Whether or not to use the platform driver.
156 */
157static void platform_end(int platform_mode)
158{
159 if (platform_mode && hibernation_ops)
160 hibernation_ops->end();
161}
162
163/**
164 * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
165 * @platform_mode: Whether or not to use the platform driver.
166 *
167 * Use the platform driver to prepare the system for creating a hibernate image,
168 * if so configured, and return an error code if that fails.
169 */
170
171static int platform_pre_snapshot(int platform_mode)
172{
173 return (platform_mode && hibernation_ops) ?
174 hibernation_ops->pre_snapshot() : 0;
175}
176
177/**
178 * platform_leave - Call platform to prepare a transition to the working state.
179 * @platform_mode: Whether or not to use the platform driver.
180 *
181 * Use the platform driver prepare to prepare the machine for switching to the
182 * normal mode of operation.
183 *
184 * This routine is called on one CPU with interrupts disabled.
185 */
186static void platform_leave(int platform_mode)
187{
188 if (platform_mode && hibernation_ops)
189 hibernation_ops->leave();
190}
191
192/**
193 * platform_finish - Call platform to switch the system to the working state.
194 * @platform_mode: Whether or not to use the platform driver.
195 *
196 * Use the platform driver to switch the machine to the normal mode of
197 * operation.
198 *
199 * This routine must be called after platform_prepare().
200 */
201static void platform_finish(int platform_mode)
202{
203 if (platform_mode && hibernation_ops)
204 hibernation_ops->finish();
205}
206
207/**
208 * platform_pre_restore - Prepare for hibernate image restoration.
209 * @platform_mode: Whether or not to use the platform driver.
210 *
211 * Use the platform driver to prepare the system for resume from a hibernation
212 * image.
213 *
214 * If the restore fails after this function has been called,
215 * platform_restore_cleanup() must be called.
216 */
217static int platform_pre_restore(int platform_mode)
218{
219 return (platform_mode && hibernation_ops) ?
220 hibernation_ops->pre_restore() : 0;
221}
222
223/**
224 * platform_restore_cleanup - Switch to the working state after failing restore.
225 * @platform_mode: Whether or not to use the platform driver.
226 *
227 * Use the platform driver to switch the system to the normal mode of operation
228 * after a failing restore.
229 *
230 * If platform_pre_restore() has been called before the failing restore, this
231 * function must be called too, regardless of the result of
232 * platform_pre_restore().
233 */
234static void platform_restore_cleanup(int platform_mode)
235{
236 if (platform_mode && hibernation_ops)
237 hibernation_ops->restore_cleanup();
238}
239
240/**
241 * platform_recover - Recover from a failure to suspend devices.
242 * @platform_mode: Whether or not to use the platform driver.
243 */
244static void platform_recover(int platform_mode)
245{
246 if (platform_mode && hibernation_ops && hibernation_ops->recover)
247 hibernation_ops->recover();
248}
249
250/**
251 * swsusp_show_speed - Print time elapsed between two events during hibernation.
252 * @start: Starting event.
253 * @stop: Final event.
254 * @nr_pages: Number of memory pages processed between @start and @stop.
255 * @msg: Additional diagnostic message to print.
256 */
257void swsusp_show_speed(ktime_t start, ktime_t stop,
258 unsigned nr_pages, char *msg)
259{
260 ktime_t diff;
261 u64 elapsed_centisecs64;
262 unsigned int centisecs;
263 unsigned int k;
264 unsigned int kps;
265
266 diff = ktime_sub(stop, start);
267 elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC);
268 centisecs = elapsed_centisecs64;
269 if (centisecs == 0)
270 centisecs = 1; /* avoid div-by-zero */
271 k = nr_pages * (PAGE_SIZE / 1024);
272 kps = (k * 100) / centisecs;
273 pr_info("%s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n",
274 msg, k, centisecs / 100, centisecs % 100, kps / 1000,
275 (kps % 1000) / 10);
276}
277
278__weak int arch_resume_nosmt(void)
279{
280 return 0;
281}
282
283/**
284 * create_image - Create a hibernation image.
285 * @platform_mode: Whether or not to use the platform driver.
286 *
287 * Execute device drivers' "late" and "noirq" freeze callbacks, create a
288 * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
289 *
290 * Control reappears in this routine after the subsequent restore.
291 */
292static int create_image(int platform_mode)
293{
294 int error;
295
296 error = dpm_suspend_end(PMSG_FREEZE);
297 if (error) {
298 pr_err("Some devices failed to power down, aborting\n");
299 return error;
300 }
301
302 error = platform_pre_snapshot(platform_mode);
303 if (error || hibernation_test(TEST_PLATFORM))
304 goto Platform_finish;
305
306 error = pm_sleep_disable_secondary_cpus();
307 if (error || hibernation_test(TEST_CPUS))
308 goto Enable_cpus;
309
310 local_irq_disable();
311
312 system_state = SYSTEM_SUSPEND;
313
314 error = syscore_suspend();
315 if (error) {
316 pr_err("Some system devices failed to power down, aborting\n");
317 goto Enable_irqs;
318 }
319
320 if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
321 goto Power_up;
322
323 in_suspend = 1;
324 save_processor_state();
325 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
326 error = swsusp_arch_suspend();
327 /* Restore control flow magically appears here */
328 restore_processor_state();
329 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
330 if (error)
331 pr_err("Error %d creating image\n", error);
332
333 if (!in_suspend) {
334 events_check_enabled = false;
335 clear_or_poison_free_pages();
336 }
337
338 platform_leave(platform_mode);
339
340 Power_up:
341 syscore_resume();
342
343 Enable_irqs:
344 system_state = SYSTEM_RUNNING;
345 local_irq_enable();
346
347 Enable_cpus:
348 pm_sleep_enable_secondary_cpus();
349
350 /* Allow architectures to do nosmt-specific post-resume dances */
351 if (!in_suspend)
352 error = arch_resume_nosmt();
353
354 Platform_finish:
355 platform_finish(platform_mode);
356
357 dpm_resume_start(in_suspend ?
358 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
359
360 return error;
361}
362
363/**
364 * hibernation_snapshot - Quiesce devices and create a hibernation image.
365 * @platform_mode: If set, use platform driver to prepare for the transition.
366 *
367 * This routine must be called with system_transition_mutex held.
368 */
369int hibernation_snapshot(int platform_mode)
370{
371 pm_message_t msg;
372 int error;
373
374 pm_suspend_clear_flags();
375 error = platform_begin(platform_mode);
376 if (error)
377 goto Close;
378
379 /* Preallocate image memory before shutting down devices. */
380 error = hibernate_preallocate_memory();
381 if (error)
382 goto Close;
383
384 error = freeze_kernel_threads();
385 if (error)
386 goto Cleanup;
387
388 if (hibernation_test(TEST_FREEZER)) {
389
390 /*
391 * Indicate to the caller that we are returning due to a
392 * successful freezer test.
393 */
394 freezer_test_done = true;
395 goto Thaw;
396 }
397
398 error = dpm_prepare(PMSG_FREEZE);
399 if (error) {
400 dpm_complete(PMSG_RECOVER);
401 goto Thaw;
402 }
403
404 suspend_console();
405 pm_restrict_gfp_mask();
406
407 error = dpm_suspend(PMSG_FREEZE);
408
409 if (error || hibernation_test(TEST_DEVICES))
410 platform_recover(platform_mode);
411 else
412 error = create_image(platform_mode);
413
414 /*
415 * In the case that we call create_image() above, the control
416 * returns here (1) after the image has been created or the
417 * image creation has failed and (2) after a successful restore.
418 */
419
420 /* We may need to release the preallocated image pages here. */
421 if (error || !in_suspend)
422 swsusp_free();
423
424 msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE;
425 dpm_resume(msg);
426
427 if (error || !in_suspend)
428 pm_restore_gfp_mask();
429
430 resume_console();
431 dpm_complete(msg);
432
433 Close:
434 platform_end(platform_mode);
435 return error;
436
437 Thaw:
438 thaw_kernel_threads();
439 Cleanup:
440 swsusp_free();
441 goto Close;
442}
443
444int __weak hibernate_resume_nonboot_cpu_disable(void)
445{
446 return suspend_disable_secondary_cpus();
447}
448
449/**
450 * resume_target_kernel - Restore system state from a hibernation image.
451 * @platform_mode: Whether or not to use the platform driver.
452 *
453 * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
454 * contents of highmem that have not been restored yet from the image and run
455 * the low-level code that will restore the remaining contents of memory and
456 * switch to the just restored target kernel.
457 */
458static int resume_target_kernel(bool platform_mode)
459{
460 int error;
461
462 error = dpm_suspend_end(PMSG_QUIESCE);
463 if (error) {
464 pr_err("Some devices failed to power down, aborting resume\n");
465 return error;
466 }
467
468 error = platform_pre_restore(platform_mode);
469 if (error)
470 goto Cleanup;
471
472 cpuidle_pause();
473
474 error = hibernate_resume_nonboot_cpu_disable();
475 if (error)
476 goto Enable_cpus;
477
478 local_irq_disable();
479 system_state = SYSTEM_SUSPEND;
480
481 error = syscore_suspend();
482 if (error)
483 goto Enable_irqs;
484
485 save_processor_state();
486 error = restore_highmem();
487 if (!error) {
488 error = swsusp_arch_resume();
489 /*
490 * The code below is only ever reached in case of a failure.
491 * Otherwise, execution continues at the place where
492 * swsusp_arch_suspend() was called.
493 */
494 BUG_ON(!error);
495 /*
496 * This call to restore_highmem() reverts the changes made by
497 * the previous one.
498 */
499 restore_highmem();
500 }
501 /*
502 * The only reason why swsusp_arch_resume() can fail is memory being
503 * very tight, so we have to free it as soon as we can to avoid
504 * subsequent failures.
505 */
506 swsusp_free();
507 restore_processor_state();
508 touch_softlockup_watchdog();
509
510 syscore_resume();
511
512 Enable_irqs:
513 system_state = SYSTEM_RUNNING;
514 local_irq_enable();
515
516 Enable_cpus:
517 pm_sleep_enable_secondary_cpus();
518
519 Cleanup:
520 platform_restore_cleanup(platform_mode);
521
522 dpm_resume_start(PMSG_RECOVER);
523
524 return error;
525}
526
527/**
528 * hibernation_restore - Quiesce devices and restore from a hibernation image.
529 * @platform_mode: If set, use platform driver to prepare for the transition.
530 *
531 * This routine must be called with system_transition_mutex held. If it is
532 * successful, control reappears in the restored target kernel in
533 * hibernation_snapshot().
534 */
535int hibernation_restore(int platform_mode)
536{
537 int error;
538
539 pm_prepare_console();
540 suspend_console();
541 pm_restrict_gfp_mask();
542 error = dpm_suspend_start(PMSG_QUIESCE);
543 if (!error) {
544 error = resume_target_kernel(platform_mode);
545 /*
546 * The above should either succeed and jump to the new kernel,
547 * or return with an error. Otherwise things are just
548 * undefined, so let's be paranoid.
549 */
550 BUG_ON(!error);
551 }
552 dpm_resume_end(PMSG_RECOVER);
553 pm_restore_gfp_mask();
554 resume_console();
555 pm_restore_console();
556 return error;
557}
558
559/**
560 * hibernation_platform_enter - Power off the system using the platform driver.
561 */
562int hibernation_platform_enter(void)
563{
564 int error;
565
566 if (!hibernation_ops)
567 return -ENOSYS;
568
569 /*
570 * We have cancelled the power transition by running
571 * hibernation_ops->finish() before saving the image, so we should let
572 * the firmware know that we're going to enter the sleep state after all
573 */
574 error = hibernation_ops->begin(PMSG_HIBERNATE);
575 if (error)
576 goto Close;
577
578 entering_platform_hibernation = true;
579 suspend_console();
580 error = dpm_suspend_start(PMSG_HIBERNATE);
581 if (error) {
582 if (hibernation_ops->recover)
583 hibernation_ops->recover();
584 goto Resume_devices;
585 }
586
587 error = dpm_suspend_end(PMSG_HIBERNATE);
588 if (error)
589 goto Resume_devices;
590
591 error = hibernation_ops->prepare();
592 if (error)
593 goto Platform_finish;
594
595 error = pm_sleep_disable_secondary_cpus();
596 if (error)
597 goto Enable_cpus;
598
599 local_irq_disable();
600 system_state = SYSTEM_SUSPEND;
601 syscore_suspend();
602 if (pm_wakeup_pending()) {
603 error = -EAGAIN;
604 goto Power_up;
605 }
606
607 hibernation_ops->enter();
608 /* We should never get here */
609 while (1);
610
611 Power_up:
612 syscore_resume();
613 system_state = SYSTEM_RUNNING;
614 local_irq_enable();
615
616 Enable_cpus:
617 pm_sleep_enable_secondary_cpus();
618
619 Platform_finish:
620 hibernation_ops->finish();
621
622 dpm_resume_start(PMSG_RESTORE);
623
624 Resume_devices:
625 entering_platform_hibernation = false;
626 dpm_resume_end(PMSG_RESTORE);
627 resume_console();
628
629 Close:
630 hibernation_ops->end();
631
632 return error;
633}
634
635/**
636 * power_down - Shut the machine down for hibernation.
637 *
638 * Use the platform driver, if configured, to put the system into the sleep
639 * state corresponding to hibernation, or try to power it off or reboot,
640 * depending on the value of hibernation_mode.
641 */
642static void power_down(void)
643{
644#ifdef CONFIG_SUSPEND
645 int error;
646
647 if (hibernation_mode == HIBERNATION_SUSPEND) {
648 error = suspend_devices_and_enter(mem_sleep_current);
649 if (error) {
650 hibernation_mode = hibernation_ops ?
651 HIBERNATION_PLATFORM :
652 HIBERNATION_SHUTDOWN;
653 } else {
654 /* Restore swap signature. */
655 error = swsusp_unmark();
656 if (error)
657 pr_err("Swap will be unusable! Try swapon -a.\n");
658
659 return;
660 }
661 }
662#endif
663
664 switch (hibernation_mode) {
665 case HIBERNATION_REBOOT:
666 kernel_restart(NULL);
667 break;
668 case HIBERNATION_PLATFORM:
669 hibernation_platform_enter();
670 fallthrough;
671 case HIBERNATION_SHUTDOWN:
672 if (kernel_can_power_off())
673 kernel_power_off();
674 break;
675 }
676 kernel_halt();
677 /*
678 * Valid image is on the disk, if we continue we risk serious data
679 * corruption after resume.
680 */
681 pr_crit("Power down manually\n");
682 while (1)
683 cpu_relax();
684}
685
686static int load_image_and_restore(void)
687{
688 int error;
689 unsigned int flags;
690
691 pm_pr_dbg("Loading hibernation image.\n");
692
693 lock_device_hotplug();
694 error = create_basic_memory_bitmaps();
695 if (error) {
696 swsusp_close(FMODE_READ | FMODE_EXCL);
697 goto Unlock;
698 }
699
700 error = swsusp_read(&flags);
701 swsusp_close(FMODE_READ | FMODE_EXCL);
702 if (!error)
703 error = hibernation_restore(flags & SF_PLATFORM_MODE);
704
705 pr_err("Failed to load image, recovering.\n");
706 swsusp_free();
707 free_basic_memory_bitmaps();
708 Unlock:
709 unlock_device_hotplug();
710
711 return error;
712}
713
714/**
715 * hibernate - Carry out system hibernation, including saving the image.
716 */
717int hibernate(void)
718{
719 bool snapshot_test = false;
720 unsigned int sleep_flags;
721 int error;
722
723 if (!hibernation_available()) {
724 pm_pr_dbg("Hibernation not available.\n");
725 return -EPERM;
726 }
727
728 sleep_flags = lock_system_sleep();
729 /* The snapshot device should not be opened while we're running */
730 if (!hibernate_acquire()) {
731 error = -EBUSY;
732 goto Unlock;
733 }
734
735 pr_info("hibernation entry\n");
736 pm_prepare_console();
737 error = pm_notifier_call_chain_robust(PM_HIBERNATION_PREPARE, PM_POST_HIBERNATION);
738 if (error)
739 goto Restore;
740
741 ksys_sync_helper();
742
743 error = freeze_processes();
744 if (error)
745 goto Exit;
746
747 lock_device_hotplug();
748 /* Allocate memory management structures */
749 error = create_basic_memory_bitmaps();
750 if (error)
751 goto Thaw;
752
753 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
754 if (error || freezer_test_done)
755 goto Free_bitmaps;
756
757 if (in_suspend) {
758 unsigned int flags = 0;
759
760 if (hibernation_mode == HIBERNATION_PLATFORM)
761 flags |= SF_PLATFORM_MODE;
762 if (nocompress)
763 flags |= SF_NOCOMPRESS_MODE;
764 else
765 flags |= SF_CRC32_MODE;
766
767 pm_pr_dbg("Writing hibernation image.\n");
768 error = swsusp_write(flags);
769 swsusp_free();
770 if (!error) {
771 if (hibernation_mode == HIBERNATION_TEST_RESUME)
772 snapshot_test = true;
773 else
774 power_down();
775 }
776 in_suspend = 0;
777 pm_restore_gfp_mask();
778 } else {
779 pm_pr_dbg("Hibernation image restored successfully.\n");
780 }
781
782 Free_bitmaps:
783 free_basic_memory_bitmaps();
784 Thaw:
785 unlock_device_hotplug();
786 if (snapshot_test) {
787 pm_pr_dbg("Checking hibernation image\n");
788 error = swsusp_check();
789 if (!error)
790 error = load_image_and_restore();
791 }
792 thaw_processes();
793
794 /* Don't bother checking whether freezer_test_done is true */
795 freezer_test_done = false;
796 Exit:
797 pm_notifier_call_chain(PM_POST_HIBERNATION);
798 Restore:
799 pm_restore_console();
800 hibernate_release();
801 Unlock:
802 unlock_system_sleep(sleep_flags);
803 pr_info("hibernation exit\n");
804
805 return error;
806}
807
808/**
809 * hibernate_quiet_exec - Execute a function with all devices frozen.
810 * @func: Function to execute.
811 * @data: Data pointer to pass to @func.
812 *
813 * Return the @func return value or an error code if it cannot be executed.
814 */
815int hibernate_quiet_exec(int (*func)(void *data), void *data)
816{
817 unsigned int sleep_flags;
818 int error;
819
820 sleep_flags = lock_system_sleep();
821
822 if (!hibernate_acquire()) {
823 error = -EBUSY;
824 goto unlock;
825 }
826
827 pm_prepare_console();
828
829 error = pm_notifier_call_chain_robust(PM_HIBERNATION_PREPARE, PM_POST_HIBERNATION);
830 if (error)
831 goto restore;
832
833 error = freeze_processes();
834 if (error)
835 goto exit;
836
837 lock_device_hotplug();
838
839 pm_suspend_clear_flags();
840
841 error = platform_begin(true);
842 if (error)
843 goto thaw;
844
845 error = freeze_kernel_threads();
846 if (error)
847 goto thaw;
848
849 error = dpm_prepare(PMSG_FREEZE);
850 if (error)
851 goto dpm_complete;
852
853 suspend_console();
854
855 error = dpm_suspend(PMSG_FREEZE);
856 if (error)
857 goto dpm_resume;
858
859 error = dpm_suspend_end(PMSG_FREEZE);
860 if (error)
861 goto dpm_resume;
862
863 error = platform_pre_snapshot(true);
864 if (error)
865 goto skip;
866
867 error = func(data);
868
869skip:
870 platform_finish(true);
871
872 dpm_resume_start(PMSG_THAW);
873
874dpm_resume:
875 dpm_resume(PMSG_THAW);
876
877 resume_console();
878
879dpm_complete:
880 dpm_complete(PMSG_THAW);
881
882 thaw_kernel_threads();
883
884thaw:
885 platform_end(true);
886
887 unlock_device_hotplug();
888
889 thaw_processes();
890
891exit:
892 pm_notifier_call_chain(PM_POST_HIBERNATION);
893
894restore:
895 pm_restore_console();
896
897 hibernate_release();
898
899unlock:
900 unlock_system_sleep(sleep_flags);
901
902 return error;
903}
904EXPORT_SYMBOL_GPL(hibernate_quiet_exec);
905
906/**
907 * software_resume - Resume from a saved hibernation image.
908 *
909 * This routine is called as a late initcall, when all devices have been
910 * discovered and initialized already.
911 *
912 * The image reading code is called to see if there is a hibernation image
913 * available for reading. If that is the case, devices are quiesced and the
914 * contents of memory is restored from the saved image.
915 *
916 * If this is successful, control reappears in the restored target kernel in
917 * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
918 * attempts to recover gracefully and make the kernel return to the normal mode
919 * of operation.
920 */
921static int software_resume(void)
922{
923 int error;
924
925 /*
926 * If the user said "noresume".. bail out early.
927 */
928 if (noresume || !hibernation_available())
929 return 0;
930
931 /*
932 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
933 * is configured into the kernel. Since the regular hibernate
934 * trigger path is via sysfs which takes a buffer mutex before
935 * calling hibernate functions (which take system_transition_mutex)
936 * this can cause lockdep to complain about a possible ABBA deadlock
937 * which cannot happen since we're in the boot code here and
938 * sysfs can't be invoked yet. Therefore, we use a subclass
939 * here to avoid lockdep complaining.
940 */
941 mutex_lock_nested(&system_transition_mutex, SINGLE_DEPTH_NESTING);
942
943 if (swsusp_resume_device)
944 goto Check_image;
945
946 if (!strlen(resume_file)) {
947 error = -ENOENT;
948 goto Unlock;
949 }
950
951 pm_pr_dbg("Checking hibernation image partition %s\n", resume_file);
952
953 if (resume_delay) {
954 pr_info("Waiting %dsec before reading resume device ...\n",
955 resume_delay);
956 ssleep(resume_delay);
957 }
958
959 /* Check if the device is there */
960 swsusp_resume_device = name_to_dev_t(resume_file);
961 if (!swsusp_resume_device) {
962 /*
963 * Some device discovery might still be in progress; we need
964 * to wait for this to finish.
965 */
966 wait_for_device_probe();
967
968 if (resume_wait) {
969 while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
970 msleep(10);
971 async_synchronize_full();
972 }
973
974 swsusp_resume_device = name_to_dev_t(resume_file);
975 if (!swsusp_resume_device) {
976 error = -ENODEV;
977 goto Unlock;
978 }
979 }
980
981 Check_image:
982 pm_pr_dbg("Hibernation image partition %d:%d present\n",
983 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
984
985 pm_pr_dbg("Looking for hibernation image.\n");
986 error = swsusp_check();
987 if (error)
988 goto Unlock;
989
990 /* The snapshot device should not be opened while we're running */
991 if (!hibernate_acquire()) {
992 error = -EBUSY;
993 swsusp_close(FMODE_READ | FMODE_EXCL);
994 goto Unlock;
995 }
996
997 pr_info("resume from hibernation\n");
998 pm_prepare_console();
999 error = pm_notifier_call_chain_robust(PM_RESTORE_PREPARE, PM_POST_RESTORE);
1000 if (error)
1001 goto Restore;
1002
1003 pm_pr_dbg("Preparing processes for hibernation restore.\n");
1004 error = freeze_processes();
1005 if (error)
1006 goto Close_Finish;
1007
1008 error = freeze_kernel_threads();
1009 if (error) {
1010 thaw_processes();
1011 goto Close_Finish;
1012 }
1013
1014 error = load_image_and_restore();
1015 thaw_processes();
1016 Finish:
1017 pm_notifier_call_chain(PM_POST_RESTORE);
1018 Restore:
1019 pm_restore_console();
1020 pr_info("resume failed (%d)\n", error);
1021 hibernate_release();
1022 /* For success case, the suspend path will release the lock */
1023 Unlock:
1024 mutex_unlock(&system_transition_mutex);
1025 pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
1026 return error;
1027 Close_Finish:
1028 swsusp_close(FMODE_READ | FMODE_EXCL);
1029 goto Finish;
1030}
1031
1032late_initcall_sync(software_resume);
1033
1034
1035static const char * const hibernation_modes[] = {
1036 [HIBERNATION_PLATFORM] = "platform",
1037 [HIBERNATION_SHUTDOWN] = "shutdown",
1038 [HIBERNATION_REBOOT] = "reboot",
1039#ifdef CONFIG_SUSPEND
1040 [HIBERNATION_SUSPEND] = "suspend",
1041#endif
1042 [HIBERNATION_TEST_RESUME] = "test_resume",
1043};
1044
1045/*
1046 * /sys/power/disk - Control hibernation mode.
1047 *
1048 * Hibernation can be handled in several ways. There are a few different ways
1049 * to put the system into the sleep state: using the platform driver (e.g. ACPI
1050 * or other hibernation_ops), powering it off or rebooting it (for testing
1051 * mostly).
1052 *
1053 * The sysfs file /sys/power/disk provides an interface for selecting the
1054 * hibernation mode to use. Reading from this file causes the available modes
1055 * to be printed. There are 3 modes that can be supported:
1056 *
1057 * 'platform'
1058 * 'shutdown'
1059 * 'reboot'
1060 *
1061 * If a platform hibernation driver is in use, 'platform' will be supported
1062 * and will be used by default. Otherwise, 'shutdown' will be used by default.
1063 * The selected option (i.e. the one corresponding to the current value of
1064 * hibernation_mode) is enclosed by a square bracket.
1065 *
1066 * To select a given hibernation mode it is necessary to write the mode's
1067 * string representation (as returned by reading from /sys/power/disk) back
1068 * into /sys/power/disk.
1069 */
1070
1071static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
1072 char *buf)
1073{
1074 int i;
1075 char *start = buf;
1076
1077 if (!hibernation_available())
1078 return sprintf(buf, "[disabled]\n");
1079
1080 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1081 if (!hibernation_modes[i])
1082 continue;
1083 switch (i) {
1084 case HIBERNATION_SHUTDOWN:
1085 case HIBERNATION_REBOOT:
1086#ifdef CONFIG_SUSPEND
1087 case HIBERNATION_SUSPEND:
1088#endif
1089 case HIBERNATION_TEST_RESUME:
1090 break;
1091 case HIBERNATION_PLATFORM:
1092 if (hibernation_ops)
1093 break;
1094 /* not a valid mode, continue with loop */
1095 continue;
1096 }
1097 if (i == hibernation_mode)
1098 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
1099 else
1100 buf += sprintf(buf, "%s ", hibernation_modes[i]);
1101 }
1102 buf += sprintf(buf, "\n");
1103 return buf-start;
1104}
1105
1106static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
1107 const char *buf, size_t n)
1108{
1109 int mode = HIBERNATION_INVALID;
1110 unsigned int sleep_flags;
1111 int error = 0;
1112 int len;
1113 char *p;
1114 int i;
1115
1116 if (!hibernation_available())
1117 return -EPERM;
1118
1119 p = memchr(buf, '\n', n);
1120 len = p ? p - buf : n;
1121
1122 sleep_flags = lock_system_sleep();
1123 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1124 if (len == strlen(hibernation_modes[i])
1125 && !strncmp(buf, hibernation_modes[i], len)) {
1126 mode = i;
1127 break;
1128 }
1129 }
1130 if (mode != HIBERNATION_INVALID) {
1131 switch (mode) {
1132 case HIBERNATION_SHUTDOWN:
1133 case HIBERNATION_REBOOT:
1134#ifdef CONFIG_SUSPEND
1135 case HIBERNATION_SUSPEND:
1136#endif
1137 case HIBERNATION_TEST_RESUME:
1138 hibernation_mode = mode;
1139 break;
1140 case HIBERNATION_PLATFORM:
1141 if (hibernation_ops)
1142 hibernation_mode = mode;
1143 else
1144 error = -EINVAL;
1145 }
1146 } else
1147 error = -EINVAL;
1148
1149 if (!error)
1150 pm_pr_dbg("Hibernation mode set to '%s'\n",
1151 hibernation_modes[mode]);
1152 unlock_system_sleep(sleep_flags);
1153 return error ? error : n;
1154}
1155
1156power_attr(disk);
1157
1158static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
1159 char *buf)
1160{
1161 return sprintf(buf, "%d:%d\n", MAJOR(swsusp_resume_device),
1162 MINOR(swsusp_resume_device));
1163}
1164
1165static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
1166 const char *buf, size_t n)
1167{
1168 unsigned int sleep_flags;
1169 int len = n;
1170 char *name;
1171 dev_t res;
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 sleep_flags = lock_system_sleep();
1185 swsusp_resume_device = res;
1186 unlock_system_sleep(sleep_flags);
1187
1188 pm_pr_dbg("Configured hibernation resume from disk to %u\n",
1189 swsusp_resume_device);
1190 noresume = 0;
1191 software_resume();
1192 return n;
1193}
1194
1195power_attr(resume);
1196
1197static ssize_t resume_offset_show(struct kobject *kobj,
1198 struct kobj_attribute *attr, char *buf)
1199{
1200 return sprintf(buf, "%llu\n", (unsigned long long)swsusp_resume_block);
1201}
1202
1203static ssize_t resume_offset_store(struct kobject *kobj,
1204 struct kobj_attribute *attr, const char *buf,
1205 size_t n)
1206{
1207 unsigned long long offset;
1208 int rc;
1209
1210 rc = kstrtoull(buf, 0, &offset);
1211 if (rc)
1212 return rc;
1213 swsusp_resume_block = offset;
1214
1215 return n;
1216}
1217
1218power_attr(resume_offset);
1219
1220static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
1221 char *buf)
1222{
1223 return sprintf(buf, "%lu\n", image_size);
1224}
1225
1226static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
1227 const char *buf, size_t n)
1228{
1229 unsigned long size;
1230
1231 if (sscanf(buf, "%lu", &size) == 1) {
1232 image_size = size;
1233 return n;
1234 }
1235
1236 return -EINVAL;
1237}
1238
1239power_attr(image_size);
1240
1241static ssize_t reserved_size_show(struct kobject *kobj,
1242 struct kobj_attribute *attr, char *buf)
1243{
1244 return sprintf(buf, "%lu\n", reserved_size);
1245}
1246
1247static ssize_t reserved_size_store(struct kobject *kobj,
1248 struct kobj_attribute *attr,
1249 const char *buf, size_t n)
1250{
1251 unsigned long size;
1252
1253 if (sscanf(buf, "%lu", &size) == 1) {
1254 reserved_size = size;
1255 return n;
1256 }
1257
1258 return -EINVAL;
1259}
1260
1261power_attr(reserved_size);
1262
1263static struct attribute *g[] = {
1264 &disk_attr.attr,
1265 &resume_offset_attr.attr,
1266 &resume_attr.attr,
1267 &image_size_attr.attr,
1268 &reserved_size_attr.attr,
1269 NULL,
1270};
1271
1272
1273static const struct attribute_group attr_group = {
1274 .attrs = g,
1275};
1276
1277
1278static int __init pm_disk_init(void)
1279{
1280 return sysfs_create_group(power_kobj, &attr_group);
1281}
1282
1283core_initcall(pm_disk_init);
1284
1285
1286static int __init resume_setup(char *str)
1287{
1288 if (noresume)
1289 return 1;
1290
1291 strncpy(resume_file, str, 255);
1292 return 1;
1293}
1294
1295static int __init resume_offset_setup(char *str)
1296{
1297 unsigned long long offset;
1298
1299 if (noresume)
1300 return 1;
1301
1302 if (sscanf(str, "%llu", &offset) == 1)
1303 swsusp_resume_block = offset;
1304
1305 return 1;
1306}
1307
1308static int __init hibernate_setup(char *str)
1309{
1310 if (!strncmp(str, "noresume", 8)) {
1311 noresume = 1;
1312 } else if (!strncmp(str, "nocompress", 10)) {
1313 nocompress = 1;
1314 } else if (!strncmp(str, "no", 2)) {
1315 noresume = 1;
1316 nohibernate = 1;
1317 } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)
1318 && !strncmp(str, "protect_image", 13)) {
1319 enable_restore_image_protection();
1320 }
1321 return 1;
1322}
1323
1324static int __init noresume_setup(char *str)
1325{
1326 noresume = 1;
1327 return 1;
1328}
1329
1330static int __init resumewait_setup(char *str)
1331{
1332 resume_wait = 1;
1333 return 1;
1334}
1335
1336static int __init resumedelay_setup(char *str)
1337{
1338 int rc = kstrtouint(str, 0, &resume_delay);
1339
1340 if (rc)
1341 pr_warn("resumedelay: bad option string '%s'\n", str);
1342 return 1;
1343}
1344
1345static int __init nohibernate_setup(char *str)
1346{
1347 noresume = 1;
1348 nohibernate = 1;
1349 return 1;
1350}
1351
1352__setup("noresume", noresume_setup);
1353__setup("resume_offset=", resume_offset_setup);
1354__setup("resume=", resume_setup);
1355__setup("hibernate=", hibernate_setup);
1356__setup("resumewait", resumewait_setup);
1357__setup("resumedelay=", resumedelay_setup);
1358__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#define pr_fmt(fmt) "PM: " fmt
14
15#include <linux/export.h>
16#include <linux/suspend.h>
17#include <linux/syscalls.h>
18#include <linux/reboot.h>
19#include <linux/string.h>
20#include <linux/device.h>
21#include <linux/async.h>
22#include <linux/delay.h>
23#include <linux/fs.h>
24#include <linux/mount.h>
25#include <linux/pm.h>
26#include <linux/nmi.h>
27#include <linux/console.h>
28#include <linux/cpu.h>
29#include <linux/freezer.h>
30#include <linux/gfp.h>
31#include <linux/syscore_ops.h>
32#include <linux/ctype.h>
33#include <linux/genhd.h>
34#include <linux/ktime.h>
35#include <trace/events/power.h>
36
37#include "power.h"
38
39
40static int nocompress;
41static int noresume;
42static int nohibernate;
43static int resume_wait;
44static unsigned int resume_delay;
45static char resume_file[256] = CONFIG_PM_STD_PARTITION;
46dev_t swsusp_resume_device;
47sector_t swsusp_resume_block;
48__visible int in_suspend __nosavedata;
49
50enum {
51 HIBERNATION_INVALID,
52 HIBERNATION_PLATFORM,
53 HIBERNATION_SHUTDOWN,
54 HIBERNATION_REBOOT,
55#ifdef CONFIG_SUSPEND
56 HIBERNATION_SUSPEND,
57#endif
58 HIBERNATION_TEST_RESUME,
59 /* keep last */
60 __HIBERNATION_AFTER_LAST
61};
62#define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
63#define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
64
65static int hibernation_mode = HIBERNATION_SHUTDOWN;
66
67bool freezer_test_done;
68
69static const struct platform_hibernation_ops *hibernation_ops;
70
71bool hibernation_available(void)
72{
73 return (nohibernate == 0);
74}
75
76/**
77 * hibernation_set_ops - Set the global hibernate operations.
78 * @ops: Hibernation operations to use in subsequent hibernation transitions.
79 */
80void hibernation_set_ops(const struct platform_hibernation_ops *ops)
81{
82 if (ops && !(ops->begin && ops->end && ops->pre_snapshot
83 && ops->prepare && ops->finish && ops->enter && ops->pre_restore
84 && ops->restore_cleanup && ops->leave)) {
85 WARN_ON(1);
86 return;
87 }
88 lock_system_sleep();
89 hibernation_ops = ops;
90 if (ops)
91 hibernation_mode = HIBERNATION_PLATFORM;
92 else if (hibernation_mode == HIBERNATION_PLATFORM)
93 hibernation_mode = HIBERNATION_SHUTDOWN;
94
95 unlock_system_sleep();
96}
97EXPORT_SYMBOL_GPL(hibernation_set_ops);
98
99static bool entering_platform_hibernation;
100
101bool system_entering_hibernation(void)
102{
103 return entering_platform_hibernation;
104}
105EXPORT_SYMBOL(system_entering_hibernation);
106
107#ifdef CONFIG_PM_DEBUG
108static void hibernation_debug_sleep(void)
109{
110 pr_info("hibernation debug: Waiting for 5 seconds.\n");
111 mdelay(5000);
112}
113
114static int hibernation_test(int level)
115{
116 if (pm_test_level == level) {
117 hibernation_debug_sleep();
118 return 1;
119 }
120 return 0;
121}
122#else /* !CONFIG_PM_DEBUG */
123static int hibernation_test(int level) { return 0; }
124#endif /* !CONFIG_PM_DEBUG */
125
126/**
127 * platform_begin - Call platform to start hibernation.
128 * @platform_mode: Whether or not to use the platform driver.
129 */
130static int platform_begin(int platform_mode)
131{
132 return (platform_mode && hibernation_ops) ?
133 hibernation_ops->begin() : 0;
134}
135
136/**
137 * platform_end - Call platform to finish transition to the working state.
138 * @platform_mode: Whether or not to use the platform driver.
139 */
140static void platform_end(int platform_mode)
141{
142 if (platform_mode && hibernation_ops)
143 hibernation_ops->end();
144}
145
146/**
147 * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
148 * @platform_mode: Whether or not to use the platform driver.
149 *
150 * Use the platform driver to prepare the system for creating a hibernate image,
151 * if so configured, and return an error code if that fails.
152 */
153
154static int platform_pre_snapshot(int platform_mode)
155{
156 return (platform_mode && hibernation_ops) ?
157 hibernation_ops->pre_snapshot() : 0;
158}
159
160/**
161 * platform_leave - Call platform to prepare a transition to the working state.
162 * @platform_mode: Whether or not to use the platform driver.
163 *
164 * Use the platform driver prepare to prepare the machine for switching to the
165 * normal mode of operation.
166 *
167 * This routine is called on one CPU with interrupts disabled.
168 */
169static void platform_leave(int platform_mode)
170{
171 if (platform_mode && hibernation_ops)
172 hibernation_ops->leave();
173}
174
175/**
176 * platform_finish - Call platform to switch the system to the working state.
177 * @platform_mode: Whether or not to use the platform driver.
178 *
179 * Use the platform driver to switch the machine to the normal mode of
180 * operation.
181 *
182 * This routine must be called after platform_prepare().
183 */
184static void platform_finish(int platform_mode)
185{
186 if (platform_mode && hibernation_ops)
187 hibernation_ops->finish();
188}
189
190/**
191 * platform_pre_restore - Prepare for hibernate image restoration.
192 * @platform_mode: Whether or not to use the platform driver.
193 *
194 * Use the platform driver to prepare the system for resume from a hibernation
195 * image.
196 *
197 * If the restore fails after this function has been called,
198 * platform_restore_cleanup() must be called.
199 */
200static int platform_pre_restore(int platform_mode)
201{
202 return (platform_mode && hibernation_ops) ?
203 hibernation_ops->pre_restore() : 0;
204}
205
206/**
207 * platform_restore_cleanup - Switch to the working state after failing restore.
208 * @platform_mode: Whether or not to use the platform driver.
209 *
210 * Use the platform driver to switch the system to the normal mode of operation
211 * after a failing restore.
212 *
213 * If platform_pre_restore() has been called before the failing restore, this
214 * function must be called too, regardless of the result of
215 * platform_pre_restore().
216 */
217static void platform_restore_cleanup(int platform_mode)
218{
219 if (platform_mode && hibernation_ops)
220 hibernation_ops->restore_cleanup();
221}
222
223/**
224 * platform_recover - Recover from a failure to suspend devices.
225 * @platform_mode: Whether or not to use the platform driver.
226 */
227static void platform_recover(int platform_mode)
228{
229 if (platform_mode && hibernation_ops && hibernation_ops->recover)
230 hibernation_ops->recover();
231}
232
233/**
234 * swsusp_show_speed - Print time elapsed between two events during hibernation.
235 * @start: Starting event.
236 * @stop: Final event.
237 * @nr_pages: Number of memory pages processed between @start and @stop.
238 * @msg: Additional diagnostic message to print.
239 */
240void swsusp_show_speed(ktime_t start, ktime_t stop,
241 unsigned nr_pages, char *msg)
242{
243 ktime_t diff;
244 u64 elapsed_centisecs64;
245 unsigned int centisecs;
246 unsigned int k;
247 unsigned int kps;
248
249 diff = ktime_sub(stop, start);
250 elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC);
251 centisecs = elapsed_centisecs64;
252 if (centisecs == 0)
253 centisecs = 1; /* avoid div-by-zero */
254 k = nr_pages * (PAGE_SIZE / 1024);
255 kps = (k * 100) / centisecs;
256 pr_info("%s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n",
257 msg, k, centisecs / 100, centisecs % 100, kps / 1000,
258 (kps % 1000) / 10);
259}
260
261/**
262 * create_image - Create a hibernation image.
263 * @platform_mode: Whether or not to use the platform driver.
264 *
265 * Execute device drivers' "late" and "noirq" freeze callbacks, create a
266 * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
267 *
268 * Control reappears in this routine after the subsequent restore.
269 */
270static int create_image(int platform_mode)
271{
272 int error;
273
274 error = dpm_suspend_end(PMSG_FREEZE);
275 if (error) {
276 pr_err("Some devices failed to power down, aborting hibernation\n");
277 return error;
278 }
279
280 error = platform_pre_snapshot(platform_mode);
281 if (error || hibernation_test(TEST_PLATFORM))
282 goto Platform_finish;
283
284 error = disable_nonboot_cpus();
285 if (error || hibernation_test(TEST_CPUS))
286 goto Enable_cpus;
287
288 local_irq_disable();
289
290 error = syscore_suspend();
291 if (error) {
292 pr_err("Some system devices failed to power down, 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 pr_err("Error %d creating hibernation image\n", error);
308
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 pr_err("Some devices failed to power down, aborting resume\n");
436 return error;
437 }
438
439 error = platform_pre_restore(platform_mode);
440 if (error)
441 goto Cleanup;
442
443 error = hibernate_resume_nonboot_cpu_disable();
444 if (error)
445 goto Enable_cpus;
446
447 local_irq_disable();
448
449 error = syscore_suspend();
450 if (error)
451 goto Enable_irqs;
452
453 save_processor_state();
454 error = restore_highmem();
455 if (!error) {
456 error = swsusp_arch_resume();
457 /*
458 * The code below is only ever reached in case of a failure.
459 * Otherwise, execution continues at the place where
460 * swsusp_arch_suspend() was called.
461 */
462 BUG_ON(!error);
463 /*
464 * This call to restore_highmem() reverts the changes made by
465 * the previous one.
466 */
467 restore_highmem();
468 }
469 /*
470 * The only reason why swsusp_arch_resume() can fail is memory being
471 * very tight, so we have to free it as soon as we can to avoid
472 * subsequent failures.
473 */
474 swsusp_free();
475 restore_processor_state();
476 touch_softlockup_watchdog();
477
478 syscore_resume();
479
480 Enable_irqs:
481 local_irq_enable();
482
483 Enable_cpus:
484 enable_nonboot_cpus();
485
486 Cleanup:
487 platform_restore_cleanup(platform_mode);
488
489 dpm_resume_start(PMSG_RECOVER);
490
491 return error;
492}
493
494/**
495 * hibernation_restore - Quiesce devices and restore from a hibernation image.
496 * @platform_mode: If set, use platform driver to prepare for the transition.
497 *
498 * This routine must be called with pm_mutex held. If it is successful, control
499 * reappears in the restored target kernel in hibernation_snapshot().
500 */
501int hibernation_restore(int platform_mode)
502{
503 int error;
504
505 pm_prepare_console();
506 suspend_console();
507 pm_restrict_gfp_mask();
508 error = dpm_suspend_start(PMSG_QUIESCE);
509 if (!error) {
510 error = resume_target_kernel(platform_mode);
511 /*
512 * The above should either succeed and jump to the new kernel,
513 * or return with an error. Otherwise things are just
514 * undefined, so let's be paranoid.
515 */
516 BUG_ON(!error);
517 }
518 dpm_resume_end(PMSG_RECOVER);
519 pm_restore_gfp_mask();
520 resume_console();
521 pm_restore_console();
522 return error;
523}
524
525/**
526 * hibernation_platform_enter - Power off the system using the platform driver.
527 */
528int hibernation_platform_enter(void)
529{
530 int error;
531
532 if (!hibernation_ops)
533 return -ENOSYS;
534
535 /*
536 * We have cancelled the power transition by running
537 * hibernation_ops->finish() before saving the image, so we should let
538 * the firmware know that we're going to enter the sleep state after all
539 */
540 error = hibernation_ops->begin();
541 if (error)
542 goto Close;
543
544 entering_platform_hibernation = true;
545 suspend_console();
546 error = dpm_suspend_start(PMSG_HIBERNATE);
547 if (error) {
548 if (hibernation_ops->recover)
549 hibernation_ops->recover();
550 goto Resume_devices;
551 }
552
553 error = dpm_suspend_end(PMSG_HIBERNATE);
554 if (error)
555 goto Resume_devices;
556
557 error = hibernation_ops->prepare();
558 if (error)
559 goto Platform_finish;
560
561 error = disable_nonboot_cpus();
562 if (error)
563 goto Enable_cpus;
564
565 local_irq_disable();
566 syscore_suspend();
567 if (pm_wakeup_pending()) {
568 error = -EAGAIN;
569 goto Power_up;
570 }
571
572 hibernation_ops->enter();
573 /* We should never get here */
574 while (1);
575
576 Power_up:
577 syscore_resume();
578 local_irq_enable();
579
580 Enable_cpus:
581 enable_nonboot_cpus();
582
583 Platform_finish:
584 hibernation_ops->finish();
585
586 dpm_resume_start(PMSG_RESTORE);
587
588 Resume_devices:
589 entering_platform_hibernation = false;
590 dpm_resume_end(PMSG_RESTORE);
591 resume_console();
592
593 Close:
594 hibernation_ops->end();
595
596 return error;
597}
598
599/**
600 * power_down - Shut the machine down for hibernation.
601 *
602 * Use the platform driver, if configured, to put the system into the sleep
603 * state corresponding to hibernation, or try to power it off or reboot,
604 * depending on the value of hibernation_mode.
605 */
606static void power_down(void)
607{
608#ifdef CONFIG_SUSPEND
609 int error;
610
611 if (hibernation_mode == HIBERNATION_SUSPEND) {
612 error = suspend_devices_and_enter(PM_SUSPEND_MEM);
613 if (error) {
614 hibernation_mode = hibernation_ops ?
615 HIBERNATION_PLATFORM :
616 HIBERNATION_SHUTDOWN;
617 } else {
618 /* Restore swap signature. */
619 error = swsusp_unmark();
620 if (error)
621 pr_err("Swap will be unusable! Try swapon -a.\n");
622
623 return;
624 }
625 }
626#endif
627
628 switch (hibernation_mode) {
629 case HIBERNATION_REBOOT:
630 kernel_restart(NULL);
631 break;
632 case HIBERNATION_PLATFORM:
633 hibernation_platform_enter();
634 case HIBERNATION_SHUTDOWN:
635 if (pm_power_off)
636 kernel_power_off();
637 break;
638 }
639 kernel_halt();
640 /*
641 * Valid image is on the disk, if we continue we risk serious data
642 * corruption after resume.
643 */
644 pr_crit("Power down manually\n");
645 while (1)
646 cpu_relax();
647}
648
649static int load_image_and_restore(void)
650{
651 int error;
652 unsigned int flags;
653
654 pm_pr_dbg("Loading hibernation image.\n");
655
656 lock_device_hotplug();
657 error = create_basic_memory_bitmaps();
658 if (error)
659 goto Unlock;
660
661 error = swsusp_read(&flags);
662 swsusp_close(FMODE_READ);
663 if (!error)
664 hibernation_restore(flags & SF_PLATFORM_MODE);
665
666 pr_err("Failed to load hibernation image, recovering.\n");
667 swsusp_free();
668 free_basic_memory_bitmaps();
669 Unlock:
670 unlock_device_hotplug();
671
672 return error;
673}
674
675/**
676 * hibernate - Carry out system hibernation, including saving the image.
677 */
678int hibernate(void)
679{
680 int error, nr_calls = 0;
681 bool snapshot_test = false;
682
683 if (!hibernation_available()) {
684 pm_pr_dbg("Hibernation not available.\n");
685 return -EPERM;
686 }
687
688 lock_system_sleep();
689 /* The snapshot device should not be opened while we're running */
690 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
691 error = -EBUSY;
692 goto Unlock;
693 }
694
695 pr_info("hibernation entry\n");
696 pm_prepare_console();
697 error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
698 if (error) {
699 nr_calls--;
700 goto Exit;
701 }
702
703 pr_info("Syncing filesystems ... \n");
704 ksys_sync();
705 pr_info("done.\n");
706
707 error = freeze_processes();
708 if (error)
709 goto Exit;
710
711 lock_device_hotplug();
712 /* Allocate memory management structures */
713 error = create_basic_memory_bitmaps();
714 if (error)
715 goto Thaw;
716
717 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
718 if (error || freezer_test_done)
719 goto Free_bitmaps;
720
721 if (in_suspend) {
722 unsigned int flags = 0;
723
724 if (hibernation_mode == HIBERNATION_PLATFORM)
725 flags |= SF_PLATFORM_MODE;
726 if (nocompress)
727 flags |= SF_NOCOMPRESS_MODE;
728 else
729 flags |= SF_CRC32_MODE;
730
731 pm_pr_dbg("Writing image.\n");
732 error = swsusp_write(flags);
733 swsusp_free();
734 if (!error) {
735 if (hibernation_mode == HIBERNATION_TEST_RESUME)
736 snapshot_test = true;
737 else
738 power_down();
739 }
740 in_suspend = 0;
741 pm_restore_gfp_mask();
742 } else {
743 pm_pr_dbg("Image restored successfully.\n");
744 }
745
746 Free_bitmaps:
747 free_basic_memory_bitmaps();
748 Thaw:
749 unlock_device_hotplug();
750 if (snapshot_test) {
751 pm_pr_dbg("Checking hibernation image\n");
752 error = swsusp_check();
753 if (!error)
754 error = load_image_and_restore();
755 }
756 thaw_processes();
757
758 /* Don't bother checking whether freezer_test_done is true */
759 freezer_test_done = false;
760 Exit:
761 __pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL);
762 pm_restore_console();
763 atomic_inc(&snapshot_device_available);
764 Unlock:
765 unlock_system_sleep();
766 pr_info("hibernation exit\n");
767
768 return error;
769}
770
771
772/**
773 * software_resume - Resume from a saved hibernation image.
774 *
775 * This routine is called as a late initcall, when all devices have been
776 * discovered and initialized already.
777 *
778 * The image reading code is called to see if there is a hibernation image
779 * available for reading. If that is the case, devices are quiesced and the
780 * contents of memory is restored from the saved image.
781 *
782 * If this is successful, control reappears in the restored target kernel in
783 * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
784 * attempts to recover gracefully and make the kernel return to the normal mode
785 * of operation.
786 */
787static int software_resume(void)
788{
789 int error, nr_calls = 0;
790
791 /*
792 * If the user said "noresume".. bail out early.
793 */
794 if (noresume || !hibernation_available())
795 return 0;
796
797 /*
798 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
799 * is configured into the kernel. Since the regular hibernate
800 * trigger path is via sysfs which takes a buffer mutex before
801 * calling hibernate functions (which take pm_mutex) this can
802 * cause lockdep to complain about a possible ABBA deadlock
803 * which cannot happen since we're in the boot code here and
804 * sysfs can't be invoked yet. Therefore, we use a subclass
805 * here to avoid lockdep complaining.
806 */
807 mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING);
808
809 if (swsusp_resume_device)
810 goto Check_image;
811
812 if (!strlen(resume_file)) {
813 error = -ENOENT;
814 goto Unlock;
815 }
816
817 pm_pr_dbg("Checking hibernation image partition %s\n", resume_file);
818
819 if (resume_delay) {
820 pr_info("Waiting %dsec before reading resume device ...\n",
821 resume_delay);
822 ssleep(resume_delay);
823 }
824
825 /* Check if the device is there */
826 swsusp_resume_device = name_to_dev_t(resume_file);
827
828 /*
829 * name_to_dev_t is ineffective to verify parition if resume_file is in
830 * integer format. (e.g. major:minor)
831 */
832 if (isdigit(resume_file[0]) && resume_wait) {
833 int partno;
834 while (!get_gendisk(swsusp_resume_device, &partno))
835 msleep(10);
836 }
837
838 if (!swsusp_resume_device) {
839 /*
840 * Some device discovery might still be in progress; we need
841 * to wait for this to finish.
842 */
843 wait_for_device_probe();
844
845 if (resume_wait) {
846 while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
847 msleep(10);
848 async_synchronize_full();
849 }
850
851 swsusp_resume_device = name_to_dev_t(resume_file);
852 if (!swsusp_resume_device) {
853 error = -ENODEV;
854 goto Unlock;
855 }
856 }
857
858 Check_image:
859 pm_pr_dbg("Hibernation image partition %d:%d present\n",
860 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
861
862 pm_pr_dbg("Looking for hibernation image.\n");
863 error = swsusp_check();
864 if (error)
865 goto Unlock;
866
867 /* The snapshot device should not be opened while we're running */
868 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
869 error = -EBUSY;
870 swsusp_close(FMODE_READ);
871 goto Unlock;
872 }
873
874 pr_info("resume from hibernation\n");
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 pm_pr_dbg("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 pr_info("resume from hibernation failed (%d)\n", error);
892 atomic_inc(&snapshot_device_available);
893 /* For success case, the suspend path will release the lock */
894 Unlock:
895 mutex_unlock(&pm_mutex);
896 pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
897 return error;
898 Close_Finish:
899 swsusp_close(FMODE_READ);
900 goto Finish;
901}
902
903late_initcall_sync(software_resume);
904
905
906static const char * const hibernation_modes[] = {
907 [HIBERNATION_PLATFORM] = "platform",
908 [HIBERNATION_SHUTDOWN] = "shutdown",
909 [HIBERNATION_REBOOT] = "reboot",
910#ifdef CONFIG_SUSPEND
911 [HIBERNATION_SUSPEND] = "suspend",
912#endif
913 [HIBERNATION_TEST_RESUME] = "test_resume",
914};
915
916/*
917 * /sys/power/disk - Control hibernation mode.
918 *
919 * Hibernation can be handled in several ways. There are a few different ways
920 * to put the system into the sleep state: using the platform driver (e.g. ACPI
921 * or other hibernation_ops), powering it off or rebooting it (for testing
922 * mostly).
923 *
924 * The sysfs file /sys/power/disk provides an interface for selecting the
925 * hibernation mode to use. Reading from this file causes the available modes
926 * to be printed. There are 3 modes that can be supported:
927 *
928 * 'platform'
929 * 'shutdown'
930 * 'reboot'
931 *
932 * If a platform hibernation driver is in use, 'platform' will be supported
933 * and will be used by default. Otherwise, 'shutdown' will be used by default.
934 * The selected option (i.e. the one corresponding to the current value of
935 * hibernation_mode) is enclosed by a square bracket.
936 *
937 * To select a given hibernation mode it is necessary to write the mode's
938 * string representation (as returned by reading from /sys/power/disk) back
939 * into /sys/power/disk.
940 */
941
942static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
943 char *buf)
944{
945 int i;
946 char *start = buf;
947
948 if (!hibernation_available())
949 return sprintf(buf, "[disabled]\n");
950
951 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
952 if (!hibernation_modes[i])
953 continue;
954 switch (i) {
955 case HIBERNATION_SHUTDOWN:
956 case HIBERNATION_REBOOT:
957#ifdef CONFIG_SUSPEND
958 case HIBERNATION_SUSPEND:
959#endif
960 case HIBERNATION_TEST_RESUME:
961 break;
962 case HIBERNATION_PLATFORM:
963 if (hibernation_ops)
964 break;
965 /* not a valid mode, continue with loop */
966 continue;
967 }
968 if (i == hibernation_mode)
969 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
970 else
971 buf += sprintf(buf, "%s ", hibernation_modes[i]);
972 }
973 buf += sprintf(buf, "\n");
974 return buf-start;
975}
976
977static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
978 const char *buf, size_t n)
979{
980 int error = 0;
981 int i;
982 int len;
983 char *p;
984 int mode = HIBERNATION_INVALID;
985
986 if (!hibernation_available())
987 return -EPERM;
988
989 p = memchr(buf, '\n', n);
990 len = p ? p - buf : n;
991
992 lock_system_sleep();
993 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
994 if (len == strlen(hibernation_modes[i])
995 && !strncmp(buf, hibernation_modes[i], len)) {
996 mode = i;
997 break;
998 }
999 }
1000 if (mode != HIBERNATION_INVALID) {
1001 switch (mode) {
1002 case HIBERNATION_SHUTDOWN:
1003 case HIBERNATION_REBOOT:
1004#ifdef CONFIG_SUSPEND
1005 case HIBERNATION_SUSPEND:
1006#endif
1007 case HIBERNATION_TEST_RESUME:
1008 hibernation_mode = mode;
1009 break;
1010 case HIBERNATION_PLATFORM:
1011 if (hibernation_ops)
1012 hibernation_mode = mode;
1013 else
1014 error = -EINVAL;
1015 }
1016 } else
1017 error = -EINVAL;
1018
1019 if (!error)
1020 pm_pr_dbg("Hibernation mode set to '%s'\n",
1021 hibernation_modes[mode]);
1022 unlock_system_sleep();
1023 return error ? error : n;
1024}
1025
1026power_attr(disk);
1027
1028static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
1029 char *buf)
1030{
1031 return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
1032 MINOR(swsusp_resume_device));
1033}
1034
1035static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
1036 const char *buf, size_t n)
1037{
1038 dev_t res;
1039 int len = n;
1040 char *name;
1041
1042 if (len && buf[len-1] == '\n')
1043 len--;
1044 name = kstrndup(buf, len, GFP_KERNEL);
1045 if (!name)
1046 return -ENOMEM;
1047
1048 res = name_to_dev_t(name);
1049 kfree(name);
1050 if (!res)
1051 return -EINVAL;
1052
1053 lock_system_sleep();
1054 swsusp_resume_device = res;
1055 unlock_system_sleep();
1056 pm_pr_dbg("Configured resume from disk to %u\n", swsusp_resume_device);
1057 noresume = 0;
1058 software_resume();
1059 return n;
1060}
1061
1062power_attr(resume);
1063
1064static ssize_t resume_offset_show(struct kobject *kobj,
1065 struct kobj_attribute *attr, char *buf)
1066{
1067 return sprintf(buf, "%llu\n", (unsigned long long)swsusp_resume_block);
1068}
1069
1070static ssize_t resume_offset_store(struct kobject *kobj,
1071 struct kobj_attribute *attr, const char *buf,
1072 size_t n)
1073{
1074 unsigned long long offset;
1075 int rc;
1076
1077 rc = kstrtoull(buf, 0, &offset);
1078 if (rc)
1079 return rc;
1080 swsusp_resume_block = offset;
1081
1082 return n;
1083}
1084
1085power_attr(resume_offset);
1086
1087static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
1088 char *buf)
1089{
1090 return sprintf(buf, "%lu\n", image_size);
1091}
1092
1093static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
1094 const char *buf, size_t n)
1095{
1096 unsigned long size;
1097
1098 if (sscanf(buf, "%lu", &size) == 1) {
1099 image_size = size;
1100 return n;
1101 }
1102
1103 return -EINVAL;
1104}
1105
1106power_attr(image_size);
1107
1108static ssize_t reserved_size_show(struct kobject *kobj,
1109 struct kobj_attribute *attr, char *buf)
1110{
1111 return sprintf(buf, "%lu\n", reserved_size);
1112}
1113
1114static ssize_t reserved_size_store(struct kobject *kobj,
1115 struct kobj_attribute *attr,
1116 const char *buf, size_t n)
1117{
1118 unsigned long size;
1119
1120 if (sscanf(buf, "%lu", &size) == 1) {
1121 reserved_size = size;
1122 return n;
1123 }
1124
1125 return -EINVAL;
1126}
1127
1128power_attr(reserved_size);
1129
1130static struct attribute * g[] = {
1131 &disk_attr.attr,
1132 &resume_offset_attr.attr,
1133 &resume_attr.attr,
1134 &image_size_attr.attr,
1135 &reserved_size_attr.attr,
1136 NULL,
1137};
1138
1139
1140static const struct attribute_group attr_group = {
1141 .attrs = g,
1142};
1143
1144
1145static int __init pm_disk_init(void)
1146{
1147 return sysfs_create_group(power_kobj, &attr_group);
1148}
1149
1150core_initcall(pm_disk_init);
1151
1152
1153static int __init resume_setup(char *str)
1154{
1155 if (noresume)
1156 return 1;
1157
1158 strncpy( resume_file, str, 255 );
1159 return 1;
1160}
1161
1162static int __init resume_offset_setup(char *str)
1163{
1164 unsigned long long offset;
1165
1166 if (noresume)
1167 return 1;
1168
1169 if (sscanf(str, "%llu", &offset) == 1)
1170 swsusp_resume_block = offset;
1171
1172 return 1;
1173}
1174
1175static int __init hibernate_setup(char *str)
1176{
1177 if (!strncmp(str, "noresume", 8)) {
1178 noresume = 1;
1179 } else if (!strncmp(str, "nocompress", 10)) {
1180 nocompress = 1;
1181 } else if (!strncmp(str, "no", 2)) {
1182 noresume = 1;
1183 nohibernate = 1;
1184 } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)
1185 && !strncmp(str, "protect_image", 13)) {
1186 enable_restore_image_protection();
1187 }
1188 return 1;
1189}
1190
1191static int __init noresume_setup(char *str)
1192{
1193 noresume = 1;
1194 return 1;
1195}
1196
1197static int __init resumewait_setup(char *str)
1198{
1199 resume_wait = 1;
1200 return 1;
1201}
1202
1203static int __init resumedelay_setup(char *str)
1204{
1205 int rc = kstrtouint(str, 0, &resume_delay);
1206
1207 if (rc)
1208 return rc;
1209 return 1;
1210}
1211
1212static int __init nohibernate_setup(char *str)
1213{
1214 noresume = 1;
1215 nohibernate = 1;
1216 return 1;
1217}
1218
1219__setup("noresume", noresume_setup);
1220__setup("resume_offset=", resume_offset_setup);
1221__setup("resume=", resume_setup);
1222__setup("hibernate=", hibernate_setup);
1223__setup("resumewait", resumewait_setup);
1224__setup("resumedelay=", resumedelay_setup);
1225__setup("nohibernate", nohibernate_setup);