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