1 // SPDX-License-Identifier: GPL-2.0-only
3 * kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support.
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>
12 #define pr_fmt(fmt) "PM: hibernation: " fmt
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>
22 #include <linux/mount.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 <linux/secretmem.h>
35 #include <trace/events/power.h>
40 static int nocompress;
42 static int nohibernate;
43 static int resume_wait;
44 static unsigned int resume_delay;
45 static char resume_file[256] = CONFIG_PM_STD_PARTITION;
46 dev_t swsusp_resume_device;
47 sector_t swsusp_resume_block;
48 __visible int in_suspend __nosavedata;
58 HIBERNATION_TEST_RESUME,
60 __HIBERNATION_AFTER_LAST
62 #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
63 #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
65 static int hibernation_mode = HIBERNATION_SHUTDOWN;
67 bool freezer_test_done;
69 static const struct platform_hibernation_ops *hibernation_ops;
71 static atomic_t hibernate_atomic = ATOMIC_INIT(1);
73 bool hibernate_acquire(void)
75 return atomic_add_unless(&hibernate_atomic, -1, 0);
78 void hibernate_release(void)
80 atomic_inc(&hibernate_atomic);
83 bool hibernation_available(void)
85 return nohibernate == 0 &&
86 !security_locked_down(LOCKDOWN_HIBERNATION) &&
91 * hibernation_set_ops - Set the global hibernate operations.
92 * @ops: Hibernation operations to use in subsequent hibernation transitions.
94 void hibernation_set_ops(const struct platform_hibernation_ops *ops)
96 if (ops && !(ops->begin && ops->end && ops->pre_snapshot
97 && ops->prepare && ops->finish && ops->enter && ops->pre_restore
98 && ops->restore_cleanup && ops->leave)) {
103 hibernation_ops = ops;
105 hibernation_mode = HIBERNATION_PLATFORM;
106 else if (hibernation_mode == HIBERNATION_PLATFORM)
107 hibernation_mode = HIBERNATION_SHUTDOWN;
109 unlock_system_sleep();
111 EXPORT_SYMBOL_GPL(hibernation_set_ops);
113 static bool entering_platform_hibernation;
115 bool system_entering_hibernation(void)
117 return entering_platform_hibernation;
119 EXPORT_SYMBOL(system_entering_hibernation);
121 #ifdef CONFIG_PM_DEBUG
122 static void hibernation_debug_sleep(void)
124 pr_info("debug: Waiting for 5 seconds.\n");
128 static int hibernation_test(int level)
130 if (pm_test_level == level) {
131 hibernation_debug_sleep();
136 #else /* !CONFIG_PM_DEBUG */
137 static int hibernation_test(int level) { return 0; }
138 #endif /* !CONFIG_PM_DEBUG */
141 * platform_begin - Call platform to start hibernation.
142 * @platform_mode: Whether or not to use the platform driver.
144 static int platform_begin(int platform_mode)
146 return (platform_mode && hibernation_ops) ?
147 hibernation_ops->begin(PMSG_FREEZE) : 0;
151 * platform_end - Call platform to finish transition to the working state.
152 * @platform_mode: Whether or not to use the platform driver.
154 static void platform_end(int platform_mode)
156 if (platform_mode && hibernation_ops)
157 hibernation_ops->end();
161 * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
162 * @platform_mode: Whether or not to use the platform driver.
164 * Use the platform driver to prepare the system for creating a hibernate image,
165 * if so configured, and return an error code if that fails.
168 static int platform_pre_snapshot(int platform_mode)
170 return (platform_mode && hibernation_ops) ?
171 hibernation_ops->pre_snapshot() : 0;
175 * platform_leave - Call platform to prepare a transition to the working state.
176 * @platform_mode: Whether or not to use the platform driver.
178 * Use the platform driver prepare to prepare the machine for switching to the
179 * normal mode of operation.
181 * This routine is called on one CPU with interrupts disabled.
183 static void platform_leave(int platform_mode)
185 if (platform_mode && hibernation_ops)
186 hibernation_ops->leave();
190 * platform_finish - Call platform to switch the system to the working state.
191 * @platform_mode: Whether or not to use the platform driver.
193 * Use the platform driver to switch the machine to the normal mode of
196 * This routine must be called after platform_prepare().
198 static void platform_finish(int platform_mode)
200 if (platform_mode && hibernation_ops)
201 hibernation_ops->finish();
205 * platform_pre_restore - Prepare for hibernate image restoration.
206 * @platform_mode: Whether or not to use the platform driver.
208 * Use the platform driver to prepare the system for resume from a hibernation
211 * If the restore fails after this function has been called,
212 * platform_restore_cleanup() must be called.
214 static int platform_pre_restore(int platform_mode)
216 return (platform_mode && hibernation_ops) ?
217 hibernation_ops->pre_restore() : 0;
221 * platform_restore_cleanup - Switch to the working state after failing restore.
222 * @platform_mode: Whether or not to use the platform driver.
224 * Use the platform driver to switch the system to the normal mode of operation
225 * after a failing restore.
227 * If platform_pre_restore() has been called before the failing restore, this
228 * function must be called too, regardless of the result of
229 * platform_pre_restore().
231 static void platform_restore_cleanup(int platform_mode)
233 if (platform_mode && hibernation_ops)
234 hibernation_ops->restore_cleanup();
238 * platform_recover - Recover from a failure to suspend devices.
239 * @platform_mode: Whether or not to use the platform driver.
241 static void platform_recover(int platform_mode)
243 if (platform_mode && hibernation_ops && hibernation_ops->recover)
244 hibernation_ops->recover();
248 * swsusp_show_speed - Print time elapsed between two events during hibernation.
249 * @start: Starting event.
250 * @stop: Final event.
251 * @nr_pages: Number of memory pages processed between @start and @stop.
252 * @msg: Additional diagnostic message to print.
254 void swsusp_show_speed(ktime_t start, ktime_t stop,
255 unsigned nr_pages, char *msg)
258 u64 elapsed_centisecs64;
259 unsigned int centisecs;
263 diff = ktime_sub(stop, start);
264 elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC);
265 centisecs = elapsed_centisecs64;
267 centisecs = 1; /* avoid div-by-zero */
268 k = nr_pages * (PAGE_SIZE / 1024);
269 kps = (k * 100) / centisecs;
270 pr_info("%s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n",
271 msg, k, centisecs / 100, centisecs % 100, kps / 1000,
275 __weak int arch_resume_nosmt(void)
281 * create_image - Create a hibernation image.
282 * @platform_mode: Whether or not to use the platform driver.
284 * Execute device drivers' "late" and "noirq" freeze callbacks, create a
285 * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
287 * Control reappears in this routine after the subsequent restore.
289 static int create_image(int platform_mode)
293 error = dpm_suspend_end(PMSG_FREEZE);
295 pr_err("Some devices failed to power down, aborting\n");
299 error = platform_pre_snapshot(platform_mode);
300 if (error || hibernation_test(TEST_PLATFORM))
301 goto Platform_finish;
303 error = suspend_disable_secondary_cpus();
304 if (error || hibernation_test(TEST_CPUS))
309 system_state = SYSTEM_SUSPEND;
311 error = syscore_suspend();
313 pr_err("Some system devices failed to power down, aborting\n");
317 if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
321 save_processor_state();
322 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
323 error = swsusp_arch_suspend();
324 /* Restore control flow magically appears here */
325 restore_processor_state();
326 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
328 pr_err("Error %d creating image\n", error);
331 events_check_enabled = false;
332 clear_or_poison_free_pages();
335 platform_leave(platform_mode);
341 system_state = SYSTEM_RUNNING;
345 suspend_enable_secondary_cpus();
347 /* Allow architectures to do nosmt-specific post-resume dances */
349 error = arch_resume_nosmt();
352 platform_finish(platform_mode);
354 dpm_resume_start(in_suspend ?
355 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
361 * hibernation_snapshot - Quiesce devices and create a hibernation image.
362 * @platform_mode: If set, use platform driver to prepare for the transition.
364 * This routine must be called with system_transition_mutex held.
366 int hibernation_snapshot(int platform_mode)
371 pm_suspend_clear_flags();
372 error = platform_begin(platform_mode);
376 /* Preallocate image memory before shutting down devices. */
377 error = hibernate_preallocate_memory();
381 error = freeze_kernel_threads();
385 if (hibernation_test(TEST_FREEZER)) {
388 * Indicate to the caller that we are returning due to a
389 * successful freezer test.
391 freezer_test_done = true;
395 error = dpm_prepare(PMSG_FREEZE);
397 dpm_complete(PMSG_RECOVER);
402 pm_restrict_gfp_mask();
404 error = dpm_suspend(PMSG_FREEZE);
406 if (error || hibernation_test(TEST_DEVICES))
407 platform_recover(platform_mode);
409 error = create_image(platform_mode);
412 * In the case that we call create_image() above, the control
413 * returns here (1) after the image has been created or the
414 * image creation has failed and (2) after a successful restore.
417 /* We may need to release the preallocated image pages here. */
418 if (error || !in_suspend)
421 msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE;
424 if (error || !in_suspend)
425 pm_restore_gfp_mask();
431 platform_end(platform_mode);
435 thaw_kernel_threads();
441 int __weak hibernate_resume_nonboot_cpu_disable(void)
443 return suspend_disable_secondary_cpus();
447 * resume_target_kernel - Restore system state from a hibernation image.
448 * @platform_mode: Whether or not to use the platform driver.
450 * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
451 * contents of highmem that have not been restored yet from the image and run
452 * the low-level code that will restore the remaining contents of memory and
453 * switch to the just restored target kernel.
455 static int resume_target_kernel(bool platform_mode)
459 error = dpm_suspend_end(PMSG_QUIESCE);
461 pr_err("Some devices failed to power down, aborting resume\n");
465 error = platform_pre_restore(platform_mode);
469 error = hibernate_resume_nonboot_cpu_disable();
474 system_state = SYSTEM_SUSPEND;
476 error = syscore_suspend();
480 save_processor_state();
481 error = restore_highmem();
483 error = swsusp_arch_resume();
485 * The code below is only ever reached in case of a failure.
486 * Otherwise, execution continues at the place where
487 * swsusp_arch_suspend() was called.
491 * This call to restore_highmem() reverts the changes made by
497 * The only reason why swsusp_arch_resume() can fail is memory being
498 * very tight, so we have to free it as soon as we can to avoid
499 * subsequent failures.
502 restore_processor_state();
503 touch_softlockup_watchdog();
508 system_state = SYSTEM_RUNNING;
512 suspend_enable_secondary_cpus();
515 platform_restore_cleanup(platform_mode);
517 dpm_resume_start(PMSG_RECOVER);
523 * hibernation_restore - Quiesce devices and restore from a hibernation image.
524 * @platform_mode: If set, use platform driver to prepare for the transition.
526 * This routine must be called with system_transition_mutex held. If it is
527 * successful, control reappears in the restored target kernel in
528 * hibernation_snapshot().
530 int hibernation_restore(int platform_mode)
534 pm_prepare_console();
536 pm_restrict_gfp_mask();
537 error = dpm_suspend_start(PMSG_QUIESCE);
539 error = resume_target_kernel(platform_mode);
541 * The above should either succeed and jump to the new kernel,
542 * or return with an error. Otherwise things are just
543 * undefined, so let's be paranoid.
547 dpm_resume_end(PMSG_RECOVER);
548 pm_restore_gfp_mask();
550 pm_restore_console();
555 * hibernation_platform_enter - Power off the system using the platform driver.
557 int hibernation_platform_enter(void)
561 if (!hibernation_ops)
565 * We have cancelled the power transition by running
566 * hibernation_ops->finish() before saving the image, so we should let
567 * the firmware know that we're going to enter the sleep state after all
569 error = hibernation_ops->begin(PMSG_HIBERNATE);
573 entering_platform_hibernation = true;
575 error = dpm_suspend_start(PMSG_HIBERNATE);
577 if (hibernation_ops->recover)
578 hibernation_ops->recover();
582 error = dpm_suspend_end(PMSG_HIBERNATE);
586 error = hibernation_ops->prepare();
588 goto Platform_finish;
590 error = suspend_disable_secondary_cpus();
595 system_state = SYSTEM_SUSPEND;
597 if (pm_wakeup_pending()) {
602 hibernation_ops->enter();
603 /* We should never get here */
608 system_state = SYSTEM_RUNNING;
612 suspend_enable_secondary_cpus();
615 hibernation_ops->finish();
617 dpm_resume_start(PMSG_RESTORE);
620 entering_platform_hibernation = false;
621 dpm_resume_end(PMSG_RESTORE);
625 hibernation_ops->end();
631 * power_down - Shut the machine down for hibernation.
633 * Use the platform driver, if configured, to put the system into the sleep
634 * state corresponding to hibernation, or try to power it off or reboot,
635 * depending on the value of hibernation_mode.
637 static void power_down(void)
639 #ifdef CONFIG_SUSPEND
642 if (hibernation_mode == HIBERNATION_SUSPEND) {
643 error = suspend_devices_and_enter(mem_sleep_current);
645 hibernation_mode = hibernation_ops ?
646 HIBERNATION_PLATFORM :
647 HIBERNATION_SHUTDOWN;
649 /* Restore swap signature. */
650 error = swsusp_unmark();
652 pr_err("Swap will be unusable! Try swapon -a.\n");
659 switch (hibernation_mode) {
660 case HIBERNATION_REBOOT:
661 kernel_restart(NULL);
663 case HIBERNATION_PLATFORM:
664 hibernation_platform_enter();
666 case HIBERNATION_SHUTDOWN:
673 * Valid image is on the disk, if we continue we risk serious data
674 * corruption after resume.
676 pr_crit("Power down manually\n");
681 static int load_image_and_restore(void)
686 pm_pr_dbg("Loading hibernation image.\n");
688 lock_device_hotplug();
689 error = create_basic_memory_bitmaps();
693 error = swsusp_read(&flags);
694 swsusp_close(FMODE_READ | FMODE_EXCL);
696 error = hibernation_restore(flags & SF_PLATFORM_MODE);
698 pr_err("Failed to load image, recovering.\n");
700 free_basic_memory_bitmaps();
702 unlock_device_hotplug();
708 * hibernate - Carry out system hibernation, including saving the image.
712 bool snapshot_test = false;
715 if (!hibernation_available()) {
716 pm_pr_dbg("Hibernation not available.\n");
721 /* The snapshot device should not be opened while we're running */
722 if (!hibernate_acquire()) {
727 pr_info("hibernation entry\n");
728 pm_prepare_console();
729 error = pm_notifier_call_chain_robust(PM_HIBERNATION_PREPARE, PM_POST_HIBERNATION);
735 error = freeze_processes();
739 lock_device_hotplug();
740 /* Allocate memory management structures */
741 error = create_basic_memory_bitmaps();
745 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
746 if (error || freezer_test_done)
750 unsigned int flags = 0;
752 if (hibernation_mode == HIBERNATION_PLATFORM)
753 flags |= SF_PLATFORM_MODE;
755 flags |= SF_NOCOMPRESS_MODE;
757 flags |= SF_CRC32_MODE;
759 pm_pr_dbg("Writing hibernation image.\n");
760 error = swsusp_write(flags);
763 if (hibernation_mode == HIBERNATION_TEST_RESUME)
764 snapshot_test = true;
769 pm_restore_gfp_mask();
771 pm_pr_dbg("Hibernation image restored successfully.\n");
775 free_basic_memory_bitmaps();
777 unlock_device_hotplug();
779 pm_pr_dbg("Checking hibernation image\n");
780 error = swsusp_check();
782 error = load_image_and_restore();
786 /* Don't bother checking whether freezer_test_done is true */
787 freezer_test_done = false;
789 pm_notifier_call_chain(PM_POST_HIBERNATION);
791 pm_restore_console();
794 unlock_system_sleep();
795 pr_info("hibernation exit\n");
801 * hibernate_quiet_exec - Execute a function with all devices frozen.
802 * @func: Function to execute.
803 * @data: Data pointer to pass to @func.
805 * Return the @func return value or an error code if it cannot be executed.
807 int hibernate_quiet_exec(int (*func)(void *data), void *data)
813 if (!hibernate_acquire()) {
818 pm_prepare_console();
820 error = pm_notifier_call_chain_robust(PM_HIBERNATION_PREPARE, PM_POST_HIBERNATION);
824 error = freeze_processes();
828 lock_device_hotplug();
830 pm_suspend_clear_flags();
832 error = platform_begin(true);
836 error = freeze_kernel_threads();
840 error = dpm_prepare(PMSG_FREEZE);
846 error = dpm_suspend(PMSG_FREEZE);
850 error = dpm_suspend_end(PMSG_FREEZE);
854 error = platform_pre_snapshot(true);
861 platform_finish(true);
863 dpm_resume_start(PMSG_THAW);
866 dpm_resume(PMSG_THAW);
871 dpm_complete(PMSG_THAW);
873 thaw_kernel_threads();
878 unlock_device_hotplug();
883 pm_notifier_call_chain(PM_POST_HIBERNATION);
886 pm_restore_console();
891 unlock_system_sleep();
895 EXPORT_SYMBOL_GPL(hibernate_quiet_exec);
898 * software_resume - Resume from a saved hibernation image.
900 * This routine is called as a late initcall, when all devices have been
901 * discovered and initialized already.
903 * The image reading code is called to see if there is a hibernation image
904 * available for reading. If that is the case, devices are quiesced and the
905 * contents of memory is restored from the saved image.
907 * If this is successful, control reappears in the restored target kernel in
908 * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
909 * attempts to recover gracefully and make the kernel return to the normal mode
912 static int software_resume(void)
917 * If the user said "noresume".. bail out early.
919 if (noresume || !hibernation_available())
923 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
924 * is configured into the kernel. Since the regular hibernate
925 * trigger path is via sysfs which takes a buffer mutex before
926 * calling hibernate functions (which take system_transition_mutex)
927 * this can cause lockdep to complain about a possible ABBA deadlock
928 * which cannot happen since we're in the boot code here and
929 * sysfs can't be invoked yet. Therefore, we use a subclass
930 * here to avoid lockdep complaining.
932 mutex_lock_nested(&system_transition_mutex, SINGLE_DEPTH_NESTING);
934 if (swsusp_resume_device)
937 if (!strlen(resume_file)) {
942 pm_pr_dbg("Checking hibernation image partition %s\n", resume_file);
945 pr_info("Waiting %dsec before reading resume device ...\n",
947 ssleep(resume_delay);
950 /* Check if the device is there */
951 swsusp_resume_device = name_to_dev_t(resume_file);
952 if (!swsusp_resume_device) {
954 * Some device discovery might still be in progress; we need
955 * to wait for this to finish.
957 wait_for_device_probe();
960 while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
962 async_synchronize_full();
965 swsusp_resume_device = name_to_dev_t(resume_file);
966 if (!swsusp_resume_device) {
973 pm_pr_dbg("Hibernation image partition %d:%d present\n",
974 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
976 pm_pr_dbg("Looking for hibernation image.\n");
977 error = swsusp_check();
981 /* The snapshot device should not be opened while we're running */
982 if (!hibernate_acquire()) {
984 swsusp_close(FMODE_READ | FMODE_EXCL);
988 pr_info("resume from hibernation\n");
989 pm_prepare_console();
990 error = pm_notifier_call_chain_robust(PM_RESTORE_PREPARE, PM_POST_RESTORE);
994 pm_pr_dbg("Preparing processes for hibernation restore.\n");
995 error = freeze_processes();
999 error = freeze_kernel_threads();
1005 error = load_image_and_restore();
1008 pm_notifier_call_chain(PM_POST_RESTORE);
1010 pm_restore_console();
1011 pr_info("resume failed (%d)\n", error);
1012 hibernate_release();
1013 /* For success case, the suspend path will release the lock */
1015 mutex_unlock(&system_transition_mutex);
1016 pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
1019 swsusp_close(FMODE_READ | FMODE_EXCL);
1023 late_initcall_sync(software_resume);
1026 static const char * const hibernation_modes[] = {
1027 [HIBERNATION_PLATFORM] = "platform",
1028 [HIBERNATION_SHUTDOWN] = "shutdown",
1029 [HIBERNATION_REBOOT] = "reboot",
1030 #ifdef CONFIG_SUSPEND
1031 [HIBERNATION_SUSPEND] = "suspend",
1033 [HIBERNATION_TEST_RESUME] = "test_resume",
1037 * /sys/power/disk - Control hibernation mode.
1039 * Hibernation can be handled in several ways. There are a few different ways
1040 * to put the system into the sleep state: using the platform driver (e.g. ACPI
1041 * or other hibernation_ops), powering it off or rebooting it (for testing
1044 * The sysfs file /sys/power/disk provides an interface for selecting the
1045 * hibernation mode to use. Reading from this file causes the available modes
1046 * to be printed. There are 3 modes that can be supported:
1052 * If a platform hibernation driver is in use, 'platform' will be supported
1053 * and will be used by default. Otherwise, 'shutdown' will be used by default.
1054 * The selected option (i.e. the one corresponding to the current value of
1055 * hibernation_mode) is enclosed by a square bracket.
1057 * To select a given hibernation mode it is necessary to write the mode's
1058 * string representation (as returned by reading from /sys/power/disk) back
1059 * into /sys/power/disk.
1062 static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
1068 if (!hibernation_available())
1069 return sprintf(buf, "[disabled]\n");
1071 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1072 if (!hibernation_modes[i])
1075 case HIBERNATION_SHUTDOWN:
1076 case HIBERNATION_REBOOT:
1077 #ifdef CONFIG_SUSPEND
1078 case HIBERNATION_SUSPEND:
1080 case HIBERNATION_TEST_RESUME:
1082 case HIBERNATION_PLATFORM:
1083 if (hibernation_ops)
1085 /* not a valid mode, continue with loop */
1088 if (i == hibernation_mode)
1089 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
1091 buf += sprintf(buf, "%s ", hibernation_modes[i]);
1093 buf += sprintf(buf, "\n");
1097 static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
1098 const char *buf, size_t n)
1104 int mode = HIBERNATION_INVALID;
1106 if (!hibernation_available())
1109 p = memchr(buf, '\n', n);
1110 len = p ? p - buf : n;
1112 lock_system_sleep();
1113 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1114 if (len == strlen(hibernation_modes[i])
1115 && !strncmp(buf, hibernation_modes[i], len)) {
1120 if (mode != HIBERNATION_INVALID) {
1122 case HIBERNATION_SHUTDOWN:
1123 case HIBERNATION_REBOOT:
1124 #ifdef CONFIG_SUSPEND
1125 case HIBERNATION_SUSPEND:
1127 case HIBERNATION_TEST_RESUME:
1128 hibernation_mode = mode;
1130 case HIBERNATION_PLATFORM:
1131 if (hibernation_ops)
1132 hibernation_mode = mode;
1140 pm_pr_dbg("Hibernation mode set to '%s'\n",
1141 hibernation_modes[mode]);
1142 unlock_system_sleep();
1143 return error ? error : n;
1148 static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
1151 return sprintf(buf, "%d:%d\n", MAJOR(swsusp_resume_device),
1152 MINOR(swsusp_resume_device));
1155 static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
1156 const char *buf, size_t n)
1162 if (len && buf[len-1] == '\n')
1164 name = kstrndup(buf, len, GFP_KERNEL);
1168 res = name_to_dev_t(name);
1173 lock_system_sleep();
1174 swsusp_resume_device = res;
1175 unlock_system_sleep();
1176 pm_pr_dbg("Configured hibernation resume from disk to %u\n",
1177 swsusp_resume_device);
1185 static ssize_t resume_offset_show(struct kobject *kobj,
1186 struct kobj_attribute *attr, char *buf)
1188 return sprintf(buf, "%llu\n", (unsigned long long)swsusp_resume_block);
1191 static ssize_t resume_offset_store(struct kobject *kobj,
1192 struct kobj_attribute *attr, const char *buf,
1195 unsigned long long offset;
1198 rc = kstrtoull(buf, 0, &offset);
1201 swsusp_resume_block = offset;
1206 power_attr(resume_offset);
1208 static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
1211 return sprintf(buf, "%lu\n", image_size);
1214 static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
1215 const char *buf, size_t n)
1219 if (sscanf(buf, "%lu", &size) == 1) {
1227 power_attr(image_size);
1229 static ssize_t reserved_size_show(struct kobject *kobj,
1230 struct kobj_attribute *attr, char *buf)
1232 return sprintf(buf, "%lu\n", reserved_size);
1235 static ssize_t reserved_size_store(struct kobject *kobj,
1236 struct kobj_attribute *attr,
1237 const char *buf, size_t n)
1241 if (sscanf(buf, "%lu", &size) == 1) {
1242 reserved_size = size;
1249 power_attr(reserved_size);
1251 static struct attribute *g[] = {
1253 &resume_offset_attr.attr,
1255 &image_size_attr.attr,
1256 &reserved_size_attr.attr,
1261 static const struct attribute_group attr_group = {
1266 static int __init pm_disk_init(void)
1268 return sysfs_create_group(power_kobj, &attr_group);
1271 core_initcall(pm_disk_init);
1274 static int __init resume_setup(char *str)
1279 strncpy(resume_file, str, 255);
1283 static int __init resume_offset_setup(char *str)
1285 unsigned long long offset;
1290 if (sscanf(str, "%llu", &offset) == 1)
1291 swsusp_resume_block = offset;
1296 static int __init hibernate_setup(char *str)
1298 if (!strncmp(str, "noresume", 8)) {
1300 } else if (!strncmp(str, "nocompress", 10)) {
1302 } else if (!strncmp(str, "no", 2)) {
1305 } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)
1306 && !strncmp(str, "protect_image", 13)) {
1307 enable_restore_image_protection();
1312 static int __init noresume_setup(char *str)
1318 static int __init resumewait_setup(char *str)
1324 static int __init resumedelay_setup(char *str)
1326 int rc = kstrtouint(str, 0, &resume_delay);
1329 pr_warn("resumedelay: bad option string '%s'\n", str);
1333 static int __init nohibernate_setup(char *str)
1340 __setup("noresume", noresume_setup);
1341 __setup("resume_offset=", resume_offset_setup);
1342 __setup("resume=", resume_setup);
1343 __setup("hibernate=", hibernate_setup);
1344 __setup("resumewait", resumewait_setup);
1345 __setup("resumedelay=", resumedelay_setup);
1346 __setup("nohibernate", nohibernate_setup);