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 <trace/events/power.h>
39 static int nocompress;
41 static int nohibernate;
42 static int resume_wait;
43 static unsigned int resume_delay;
44 static char resume_file[256] = CONFIG_PM_STD_PARTITION;
45 dev_t swsusp_resume_device;
46 sector_t swsusp_resume_block;
47 __visible int in_suspend __nosavedata;
57 HIBERNATION_TEST_RESUME,
59 __HIBERNATION_AFTER_LAST
61 #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
62 #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
64 static int hibernation_mode = HIBERNATION_SHUTDOWN;
66 bool freezer_test_done;
68 static const struct platform_hibernation_ops *hibernation_ops;
70 static atomic_t hibernate_atomic = ATOMIC_INIT(1);
72 bool hibernate_acquire(void)
74 return atomic_add_unless(&hibernate_atomic, -1, 0);
77 void hibernate_release(void)
79 atomic_inc(&hibernate_atomic);
82 bool hibernation_available(void)
84 return nohibernate == 0 && !security_locked_down(LOCKDOWN_HIBERNATION);
88 * hibernation_set_ops - Set the global hibernate operations.
89 * @ops: Hibernation operations to use in subsequent hibernation transitions.
91 void hibernation_set_ops(const struct platform_hibernation_ops *ops)
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)) {
100 hibernation_ops = ops;
102 hibernation_mode = HIBERNATION_PLATFORM;
103 else if (hibernation_mode == HIBERNATION_PLATFORM)
104 hibernation_mode = HIBERNATION_SHUTDOWN;
106 unlock_system_sleep();
108 EXPORT_SYMBOL_GPL(hibernation_set_ops);
110 static bool entering_platform_hibernation;
112 bool system_entering_hibernation(void)
114 return entering_platform_hibernation;
116 EXPORT_SYMBOL(system_entering_hibernation);
118 #ifdef CONFIG_PM_DEBUG
119 static void hibernation_debug_sleep(void)
121 pr_info("debug: Waiting for 5 seconds.\n");
125 static int hibernation_test(int level)
127 if (pm_test_level == level) {
128 hibernation_debug_sleep();
133 #else /* !CONFIG_PM_DEBUG */
134 static int hibernation_test(int level) { return 0; }
135 #endif /* !CONFIG_PM_DEBUG */
138 * platform_begin - Call platform to start hibernation.
139 * @platform_mode: Whether or not to use the platform driver.
141 static int platform_begin(int platform_mode)
143 return (platform_mode && hibernation_ops) ?
144 hibernation_ops->begin(PMSG_FREEZE) : 0;
148 * platform_end - Call platform to finish transition to the working state.
149 * @platform_mode: Whether or not to use the platform driver.
151 static void platform_end(int platform_mode)
153 if (platform_mode && hibernation_ops)
154 hibernation_ops->end();
158 * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
159 * @platform_mode: Whether or not to use the platform driver.
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.
165 static int platform_pre_snapshot(int platform_mode)
167 return (platform_mode && hibernation_ops) ?
168 hibernation_ops->pre_snapshot() : 0;
172 * platform_leave - Call platform to prepare a transition to the working state.
173 * @platform_mode: Whether or not to use the platform driver.
175 * Use the platform driver prepare to prepare the machine for switching to the
176 * normal mode of operation.
178 * This routine is called on one CPU with interrupts disabled.
180 static void platform_leave(int platform_mode)
182 if (platform_mode && hibernation_ops)
183 hibernation_ops->leave();
187 * platform_finish - Call platform to switch the system to the working state.
188 * @platform_mode: Whether or not to use the platform driver.
190 * Use the platform driver to switch the machine to the normal mode of
193 * This routine must be called after platform_prepare().
195 static void platform_finish(int platform_mode)
197 if (platform_mode && hibernation_ops)
198 hibernation_ops->finish();
202 * platform_pre_restore - Prepare for hibernate image restoration.
203 * @platform_mode: Whether or not to use the platform driver.
205 * Use the platform driver to prepare the system for resume from a hibernation
208 * If the restore fails after this function has been called,
209 * platform_restore_cleanup() must be called.
211 static int platform_pre_restore(int platform_mode)
213 return (platform_mode && hibernation_ops) ?
214 hibernation_ops->pre_restore() : 0;
218 * platform_restore_cleanup - Switch to the working state after failing restore.
219 * @platform_mode: Whether or not to use the platform driver.
221 * Use the platform driver to switch the system to the normal mode of operation
222 * after a failing restore.
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().
228 static void platform_restore_cleanup(int platform_mode)
230 if (platform_mode && hibernation_ops)
231 hibernation_ops->restore_cleanup();
235 * platform_recover - Recover from a failure to suspend devices.
236 * @platform_mode: Whether or not to use the platform driver.
238 static void platform_recover(int platform_mode)
240 if (platform_mode && hibernation_ops && hibernation_ops->recover)
241 hibernation_ops->recover();
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.
251 void swsusp_show_speed(ktime_t start, ktime_t stop,
252 unsigned nr_pages, char *msg)
255 u64 elapsed_centisecs64;
256 unsigned int centisecs;
260 diff = ktime_sub(stop, start);
261 elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC);
262 centisecs = elapsed_centisecs64;
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,
272 __weak int arch_resume_nosmt(void)
278 * create_image - Create a hibernation image.
279 * @platform_mode: Whether or not to use the platform driver.
281 * Execute device drivers' "late" and "noirq" freeze callbacks, create a
282 * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
284 * Control reappears in this routine after the subsequent restore.
286 static int create_image(int platform_mode)
290 error = dpm_suspend_end(PMSG_FREEZE);
292 pr_err("Some devices failed to power down, aborting\n");
296 error = platform_pre_snapshot(platform_mode);
297 if (error || hibernation_test(TEST_PLATFORM))
298 goto Platform_finish;
300 error = suspend_disable_secondary_cpus();
301 if (error || hibernation_test(TEST_CPUS))
306 system_state = SYSTEM_SUSPEND;
308 error = syscore_suspend();
310 pr_err("Some system devices failed to power down, aborting\n");
314 if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
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);
325 pr_err("Error %d creating image\n", error);
328 events_check_enabled = false;
329 clear_or_poison_free_pages();
332 platform_leave(platform_mode);
338 system_state = SYSTEM_RUNNING;
342 suspend_enable_secondary_cpus();
344 /* Allow architectures to do nosmt-specific post-resume dances */
346 error = arch_resume_nosmt();
349 platform_finish(platform_mode);
351 dpm_resume_start(in_suspend ?
352 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
358 * hibernation_snapshot - Quiesce devices and create a hibernation image.
359 * @platform_mode: If set, use platform driver to prepare for the transition.
361 * This routine must be called with system_transition_mutex held.
363 int hibernation_snapshot(int platform_mode)
368 pm_suspend_clear_flags();
369 error = platform_begin(platform_mode);
373 /* Preallocate image memory before shutting down devices. */
374 error = hibernate_preallocate_memory();
378 error = freeze_kernel_threads();
382 if (hibernation_test(TEST_FREEZER)) {
385 * Indicate to the caller that we are returning due to a
386 * successful freezer test.
388 freezer_test_done = true;
392 error = dpm_prepare(PMSG_FREEZE);
394 dpm_complete(PMSG_RECOVER);
399 pm_restrict_gfp_mask();
401 error = dpm_suspend(PMSG_FREEZE);
403 if (error || hibernation_test(TEST_DEVICES))
404 platform_recover(platform_mode);
406 error = create_image(platform_mode);
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.
414 /* We may need to release the preallocated image pages here. */
415 if (error || !in_suspend)
418 msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE;
421 if (error || !in_suspend)
422 pm_restore_gfp_mask();
428 platform_end(platform_mode);
432 thaw_kernel_threads();
438 int __weak hibernate_resume_nonboot_cpu_disable(void)
440 return suspend_disable_secondary_cpus();
444 * resume_target_kernel - Restore system state from a hibernation image.
445 * @platform_mode: Whether or not to use the platform driver.
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.
452 static int resume_target_kernel(bool platform_mode)
456 error = dpm_suspend_end(PMSG_QUIESCE);
458 pr_err("Some devices failed to power down, aborting resume\n");
462 error = platform_pre_restore(platform_mode);
466 error = hibernate_resume_nonboot_cpu_disable();
471 system_state = SYSTEM_SUSPEND;
473 error = syscore_suspend();
477 save_processor_state();
478 error = restore_highmem();
480 error = swsusp_arch_resume();
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.
488 * This call to restore_highmem() reverts the changes made by
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.
499 restore_processor_state();
500 touch_softlockup_watchdog();
505 system_state = SYSTEM_RUNNING;
509 suspend_enable_secondary_cpus();
512 platform_restore_cleanup(platform_mode);
514 dpm_resume_start(PMSG_RECOVER);
520 * hibernation_restore - Quiesce devices and restore from a hibernation image.
521 * @platform_mode: If set, use platform driver to prepare for the transition.
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().
527 int hibernation_restore(int platform_mode)
531 pm_prepare_console();
533 pm_restrict_gfp_mask();
534 error = dpm_suspend_start(PMSG_QUIESCE);
536 error = resume_target_kernel(platform_mode);
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.
544 dpm_resume_end(PMSG_RECOVER);
545 pm_restore_gfp_mask();
547 pm_restore_console();
552 * hibernation_platform_enter - Power off the system using the platform driver.
554 int hibernation_platform_enter(void)
558 if (!hibernation_ops)
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
566 error = hibernation_ops->begin(PMSG_HIBERNATE);
570 entering_platform_hibernation = true;
572 error = dpm_suspend_start(PMSG_HIBERNATE);
574 if (hibernation_ops->recover)
575 hibernation_ops->recover();
579 error = dpm_suspend_end(PMSG_HIBERNATE);
583 error = hibernation_ops->prepare();
585 goto Platform_finish;
587 error = suspend_disable_secondary_cpus();
592 system_state = SYSTEM_SUSPEND;
594 if (pm_wakeup_pending()) {
599 hibernation_ops->enter();
600 /* We should never get here */
605 system_state = SYSTEM_RUNNING;
609 suspend_enable_secondary_cpus();
612 hibernation_ops->finish();
614 dpm_resume_start(PMSG_RESTORE);
617 entering_platform_hibernation = false;
618 dpm_resume_end(PMSG_RESTORE);
622 hibernation_ops->end();
628 * power_down - Shut the machine down for hibernation.
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.
634 static void power_down(void)
636 #ifdef CONFIG_SUSPEND
639 if (hibernation_mode == HIBERNATION_SUSPEND) {
640 error = suspend_devices_and_enter(PM_SUSPEND_MEM);
642 hibernation_mode = hibernation_ops ?
643 HIBERNATION_PLATFORM :
644 HIBERNATION_SHUTDOWN;
646 /* Restore swap signature. */
647 error = swsusp_unmark();
649 pr_err("Swap will be unusable! Try swapon -a.\n");
656 switch (hibernation_mode) {
657 case HIBERNATION_REBOOT:
658 kernel_restart(NULL);
660 case HIBERNATION_PLATFORM:
661 hibernation_platform_enter();
663 case HIBERNATION_SHUTDOWN:
670 * Valid image is on the disk, if we continue we risk serious data
671 * corruption after resume.
673 pr_crit("Power down manually\n");
678 static int load_image_and_restore(void)
683 pm_pr_dbg("Loading hibernation image.\n");
685 lock_device_hotplug();
686 error = create_basic_memory_bitmaps();
690 error = swsusp_read(&flags);
691 swsusp_close(FMODE_READ);
693 error = hibernation_restore(flags & SF_PLATFORM_MODE);
695 pr_err("Failed to load image, recovering.\n");
697 free_basic_memory_bitmaps();
699 unlock_device_hotplug();
705 * hibernate - Carry out system hibernation, including saving the image.
709 bool snapshot_test = false;
712 if (!hibernation_available()) {
713 pm_pr_dbg("Hibernation not available.\n");
718 /* The snapshot device should not be opened while we're running */
719 if (!hibernate_acquire()) {
724 pr_info("hibernation entry\n");
725 pm_prepare_console();
726 error = pm_notifier_call_chain_robust(PM_HIBERNATION_PREPARE, PM_POST_HIBERNATION);
732 error = freeze_processes();
736 lock_device_hotplug();
737 /* Allocate memory management structures */
738 error = create_basic_memory_bitmaps();
742 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
743 if (error || freezer_test_done)
747 unsigned int flags = 0;
749 if (hibernation_mode == HIBERNATION_PLATFORM)
750 flags |= SF_PLATFORM_MODE;
752 flags |= SF_NOCOMPRESS_MODE;
754 flags |= SF_CRC32_MODE;
756 pm_pr_dbg("Writing hibernation image.\n");
757 error = swsusp_write(flags);
760 if (hibernation_mode == HIBERNATION_TEST_RESUME)
761 snapshot_test = true;
766 pm_restore_gfp_mask();
768 pm_pr_dbg("Hibernation image restored successfully.\n");
772 free_basic_memory_bitmaps();
774 unlock_device_hotplug();
776 pm_pr_dbg("Checking hibernation image\n");
777 error = swsusp_check();
779 error = load_image_and_restore();
783 /* Don't bother checking whether freezer_test_done is true */
784 freezer_test_done = false;
786 pm_notifier_call_chain(PM_POST_HIBERNATION);
788 pm_restore_console();
791 unlock_system_sleep();
792 pr_info("hibernation exit\n");
798 * hibernate_quiet_exec - Execute a function with all devices frozen.
799 * @func: Function to execute.
800 * @data: Data pointer to pass to @func.
802 * Return the @func return value or an error code if it cannot be executed.
804 int hibernate_quiet_exec(int (*func)(void *data), void *data)
810 if (!hibernate_acquire()) {
815 pm_prepare_console();
817 error = pm_notifier_call_chain_robust(PM_HIBERNATION_PREPARE, PM_POST_HIBERNATION);
821 error = freeze_processes();
825 lock_device_hotplug();
827 pm_suspend_clear_flags();
829 error = platform_begin(true);
833 error = freeze_kernel_threads();
837 error = dpm_prepare(PMSG_FREEZE);
843 error = dpm_suspend(PMSG_FREEZE);
847 error = dpm_suspend_end(PMSG_FREEZE);
851 error = platform_pre_snapshot(true);
858 platform_finish(true);
860 dpm_resume_start(PMSG_THAW);
863 dpm_resume(PMSG_THAW);
868 dpm_complete(PMSG_THAW);
870 thaw_kernel_threads();
875 unlock_device_hotplug();
880 pm_notifier_call_chain(PM_POST_HIBERNATION);
883 pm_restore_console();
888 unlock_system_sleep();
892 EXPORT_SYMBOL_GPL(hibernate_quiet_exec);
895 * software_resume - Resume from a saved hibernation image.
897 * This routine is called as a late initcall, when all devices have been
898 * discovered and initialized already.
900 * The image reading code is called to see if there is a hibernation image
901 * available for reading. If that is the case, devices are quiesced and the
902 * contents of memory is restored from the saved image.
904 * If this is successful, control reappears in the restored target kernel in
905 * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
906 * attempts to recover gracefully and make the kernel return to the normal mode
909 static int software_resume(void)
914 * If the user said "noresume".. bail out early.
916 if (noresume || !hibernation_available())
920 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
921 * is configured into the kernel. Since the regular hibernate
922 * trigger path is via sysfs which takes a buffer mutex before
923 * calling hibernate functions (which take system_transition_mutex)
924 * this can cause lockdep to complain about a possible ABBA deadlock
925 * which cannot happen since we're in the boot code here and
926 * sysfs can't be invoked yet. Therefore, we use a subclass
927 * here to avoid lockdep complaining.
929 mutex_lock_nested(&system_transition_mutex, SINGLE_DEPTH_NESTING);
931 if (swsusp_resume_device)
934 if (!strlen(resume_file)) {
939 pm_pr_dbg("Checking hibernation image partition %s\n", resume_file);
942 pr_info("Waiting %dsec before reading resume device ...\n",
944 ssleep(resume_delay);
947 /* Check if the device is there */
948 swsusp_resume_device = name_to_dev_t(resume_file);
949 if (!swsusp_resume_device) {
951 * Some device discovery might still be in progress; we need
952 * to wait for this to finish.
954 wait_for_device_probe();
957 while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
959 async_synchronize_full();
962 swsusp_resume_device = name_to_dev_t(resume_file);
963 if (!swsusp_resume_device) {
970 pm_pr_dbg("Hibernation image partition %d:%d present\n",
971 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
973 pm_pr_dbg("Looking for hibernation image.\n");
974 error = swsusp_check();
978 /* The snapshot device should not be opened while we're running */
979 if (!hibernate_acquire()) {
981 swsusp_close(FMODE_READ);
985 pr_info("resume from hibernation\n");
986 pm_prepare_console();
987 error = pm_notifier_call_chain_robust(PM_RESTORE_PREPARE, PM_POST_RESTORE);
991 pm_pr_dbg("Preparing processes for hibernation restore.\n");
992 error = freeze_processes();
996 error = freeze_kernel_threads();
1002 error = load_image_and_restore();
1005 pm_notifier_call_chain(PM_POST_RESTORE);
1007 pm_restore_console();
1008 pr_info("resume failed (%d)\n", error);
1009 hibernate_release();
1010 /* For success case, the suspend path will release the lock */
1012 mutex_unlock(&system_transition_mutex);
1013 pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
1016 swsusp_close(FMODE_READ);
1020 late_initcall_sync(software_resume);
1023 static const char * const hibernation_modes[] = {
1024 [HIBERNATION_PLATFORM] = "platform",
1025 [HIBERNATION_SHUTDOWN] = "shutdown",
1026 [HIBERNATION_REBOOT] = "reboot",
1027 #ifdef CONFIG_SUSPEND
1028 [HIBERNATION_SUSPEND] = "suspend",
1030 [HIBERNATION_TEST_RESUME] = "test_resume",
1034 * /sys/power/disk - Control hibernation mode.
1036 * Hibernation can be handled in several ways. There are a few different ways
1037 * to put the system into the sleep state: using the platform driver (e.g. ACPI
1038 * or other hibernation_ops), powering it off or rebooting it (for testing
1041 * The sysfs file /sys/power/disk provides an interface for selecting the
1042 * hibernation mode to use. Reading from this file causes the available modes
1043 * to be printed. There are 3 modes that can be supported:
1049 * If a platform hibernation driver is in use, 'platform' will be supported
1050 * and will be used by default. Otherwise, 'shutdown' will be used by default.
1051 * The selected option (i.e. the one corresponding to the current value of
1052 * hibernation_mode) is enclosed by a square bracket.
1054 * To select a given hibernation mode it is necessary to write the mode's
1055 * string representation (as returned by reading from /sys/power/disk) back
1056 * into /sys/power/disk.
1059 static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
1065 if (!hibernation_available())
1066 return sprintf(buf, "[disabled]\n");
1068 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1069 if (!hibernation_modes[i])
1072 case HIBERNATION_SHUTDOWN:
1073 case HIBERNATION_REBOOT:
1074 #ifdef CONFIG_SUSPEND
1075 case HIBERNATION_SUSPEND:
1077 case HIBERNATION_TEST_RESUME:
1079 case HIBERNATION_PLATFORM:
1080 if (hibernation_ops)
1082 /* not a valid mode, continue with loop */
1085 if (i == hibernation_mode)
1086 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
1088 buf += sprintf(buf, "%s ", hibernation_modes[i]);
1090 buf += sprintf(buf, "\n");
1094 static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
1095 const char *buf, size_t n)
1101 int mode = HIBERNATION_INVALID;
1103 if (!hibernation_available())
1106 p = memchr(buf, '\n', n);
1107 len = p ? p - buf : n;
1109 lock_system_sleep();
1110 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1111 if (len == strlen(hibernation_modes[i])
1112 && !strncmp(buf, hibernation_modes[i], len)) {
1117 if (mode != HIBERNATION_INVALID) {
1119 case HIBERNATION_SHUTDOWN:
1120 case HIBERNATION_REBOOT:
1121 #ifdef CONFIG_SUSPEND
1122 case HIBERNATION_SUSPEND:
1124 case HIBERNATION_TEST_RESUME:
1125 hibernation_mode = mode;
1127 case HIBERNATION_PLATFORM:
1128 if (hibernation_ops)
1129 hibernation_mode = mode;
1137 pm_pr_dbg("Hibernation mode set to '%s'\n",
1138 hibernation_modes[mode]);
1139 unlock_system_sleep();
1140 return error ? error : n;
1145 static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
1148 return sprintf(buf, "%d:%d\n", MAJOR(swsusp_resume_device),
1149 MINOR(swsusp_resume_device));
1152 static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
1153 const char *buf, size_t n)
1159 if (len && buf[len-1] == '\n')
1161 name = kstrndup(buf, len, GFP_KERNEL);
1165 res = name_to_dev_t(name);
1170 lock_system_sleep();
1171 swsusp_resume_device = res;
1172 unlock_system_sleep();
1173 pm_pr_dbg("Configured hibernation resume from disk to %u\n",
1174 swsusp_resume_device);
1182 static ssize_t resume_offset_show(struct kobject *kobj,
1183 struct kobj_attribute *attr, char *buf)
1185 return sprintf(buf, "%llu\n", (unsigned long long)swsusp_resume_block);
1188 static ssize_t resume_offset_store(struct kobject *kobj,
1189 struct kobj_attribute *attr, const char *buf,
1192 unsigned long long offset;
1195 rc = kstrtoull(buf, 0, &offset);
1198 swsusp_resume_block = offset;
1203 power_attr(resume_offset);
1205 static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
1208 return sprintf(buf, "%lu\n", image_size);
1211 static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
1212 const char *buf, size_t n)
1216 if (sscanf(buf, "%lu", &size) == 1) {
1224 power_attr(image_size);
1226 static ssize_t reserved_size_show(struct kobject *kobj,
1227 struct kobj_attribute *attr, char *buf)
1229 return sprintf(buf, "%lu\n", reserved_size);
1232 static ssize_t reserved_size_store(struct kobject *kobj,
1233 struct kobj_attribute *attr,
1234 const char *buf, size_t n)
1238 if (sscanf(buf, "%lu", &size) == 1) {
1239 reserved_size = size;
1246 power_attr(reserved_size);
1248 static struct attribute *g[] = {
1250 &resume_offset_attr.attr,
1252 &image_size_attr.attr,
1253 &reserved_size_attr.attr,
1258 static const struct attribute_group attr_group = {
1263 static int __init pm_disk_init(void)
1265 return sysfs_create_group(power_kobj, &attr_group);
1268 core_initcall(pm_disk_init);
1271 static int __init resume_setup(char *str)
1276 strncpy(resume_file, str, 255);
1280 static int __init resume_offset_setup(char *str)
1282 unsigned long long offset;
1287 if (sscanf(str, "%llu", &offset) == 1)
1288 swsusp_resume_block = offset;
1293 static int __init hibernate_setup(char *str)
1295 if (!strncmp(str, "noresume", 8)) {
1297 } else if (!strncmp(str, "nocompress", 10)) {
1299 } else if (!strncmp(str, "no", 2)) {
1302 } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)
1303 && !strncmp(str, "protect_image", 13)) {
1304 enable_restore_image_protection();
1309 static int __init noresume_setup(char *str)
1315 static int __init resumewait_setup(char *str)
1321 static int __init resumedelay_setup(char *str)
1323 int rc = kstrtouint(str, 0, &resume_delay);
1330 static int __init nohibernate_setup(char *str)
1337 __setup("noresume", noresume_setup);
1338 __setup("resume_offset=", resume_offset_setup);
1339 __setup("resume=", resume_setup);
1340 __setup("hibernate=", hibernate_setup);
1341 __setup("resumewait", resumewait_setup);
1342 __setup("resumedelay=", resumedelay_setup);
1343 __setup("nohibernate", nohibernate_setup);