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