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 bool hibernation_available(void)
72 return nohibernate == 0 && !security_locked_down(LOCKDOWN_HIBERNATION);
76 * hibernation_set_ops - Set the global hibernate operations.
77 * @ops: Hibernation operations to use in subsequent hibernation transitions.
79 void hibernation_set_ops(const struct platform_hibernation_ops *ops)
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)) {
88 hibernation_ops = ops;
90 hibernation_mode = HIBERNATION_PLATFORM;
91 else if (hibernation_mode == HIBERNATION_PLATFORM)
92 hibernation_mode = HIBERNATION_SHUTDOWN;
94 unlock_system_sleep();
96 EXPORT_SYMBOL_GPL(hibernation_set_ops);
98 static bool entering_platform_hibernation;
100 bool system_entering_hibernation(void)
102 return entering_platform_hibernation;
104 EXPORT_SYMBOL(system_entering_hibernation);
106 #ifdef CONFIG_PM_DEBUG
107 static void hibernation_debug_sleep(void)
109 pr_info("debug: Waiting for 5 seconds.\n");
113 static int hibernation_test(int level)
115 if (pm_test_level == level) {
116 hibernation_debug_sleep();
121 #else /* !CONFIG_PM_DEBUG */
122 static int hibernation_test(int level) { return 0; }
123 #endif /* !CONFIG_PM_DEBUG */
126 * platform_begin - Call platform to start hibernation.
127 * @platform_mode: Whether or not to use the platform driver.
129 static int platform_begin(int platform_mode)
131 return (platform_mode && hibernation_ops) ?
132 hibernation_ops->begin(PMSG_FREEZE) : 0;
136 * platform_end - Call platform to finish transition to the working state.
137 * @platform_mode: Whether or not to use the platform driver.
139 static void platform_end(int platform_mode)
141 if (platform_mode && hibernation_ops)
142 hibernation_ops->end();
146 * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
147 * @platform_mode: Whether or not to use the platform driver.
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.
153 static int platform_pre_snapshot(int platform_mode)
155 return (platform_mode && hibernation_ops) ?
156 hibernation_ops->pre_snapshot() : 0;
160 * platform_leave - Call platform to prepare a transition to the working state.
161 * @platform_mode: Whether or not to use the platform driver.
163 * Use the platform driver prepare to prepare the machine for switching to the
164 * normal mode of operation.
166 * This routine is called on one CPU with interrupts disabled.
168 static void platform_leave(int platform_mode)
170 if (platform_mode && hibernation_ops)
171 hibernation_ops->leave();
175 * platform_finish - Call platform to switch the system to the working state.
176 * @platform_mode: Whether or not to use the platform driver.
178 * Use the platform driver to switch the machine to the normal mode of
181 * This routine must be called after platform_prepare().
183 static void platform_finish(int platform_mode)
185 if (platform_mode && hibernation_ops)
186 hibernation_ops->finish();
190 * platform_pre_restore - Prepare for hibernate image restoration.
191 * @platform_mode: Whether or not to use the platform driver.
193 * Use the platform driver to prepare the system for resume from a hibernation
196 * If the restore fails after this function has been called,
197 * platform_restore_cleanup() must be called.
199 static int platform_pre_restore(int platform_mode)
201 return (platform_mode && hibernation_ops) ?
202 hibernation_ops->pre_restore() : 0;
206 * platform_restore_cleanup - Switch to the working state after failing restore.
207 * @platform_mode: Whether or not to use the platform driver.
209 * Use the platform driver to switch the system to the normal mode of operation
210 * after a failing restore.
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().
216 static void platform_restore_cleanup(int platform_mode)
218 if (platform_mode && hibernation_ops)
219 hibernation_ops->restore_cleanup();
223 * platform_recover - Recover from a failure to suspend devices.
224 * @platform_mode: Whether or not to use the platform driver.
226 static void platform_recover(int platform_mode)
228 if (platform_mode && hibernation_ops && hibernation_ops->recover)
229 hibernation_ops->recover();
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.
239 void swsusp_show_speed(ktime_t start, ktime_t stop,
240 unsigned nr_pages, char *msg)
243 u64 elapsed_centisecs64;
244 unsigned int centisecs;
248 diff = ktime_sub(stop, start);
249 elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC);
250 centisecs = elapsed_centisecs64;
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,
260 __weak int arch_resume_nosmt(void)
266 * create_image - Create a hibernation image.
267 * @platform_mode: Whether or not to use the platform driver.
269 * Execute device drivers' "late" and "noirq" freeze callbacks, create a
270 * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
272 * Control reappears in this routine after the subsequent restore.
274 static int create_image(int platform_mode)
278 error = dpm_suspend_end(PMSG_FREEZE);
280 pr_err("Some devices failed to power down, aborting\n");
284 error = platform_pre_snapshot(platform_mode);
285 if (error || hibernation_test(TEST_PLATFORM))
286 goto Platform_finish;
288 error = suspend_disable_secondary_cpus();
289 if (error || hibernation_test(TEST_CPUS))
294 system_state = SYSTEM_SUSPEND;
296 error = syscore_suspend();
298 pr_err("Some system devices failed to power down, aborting\n");
302 if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
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);
313 pr_err("Error %d creating image\n", error);
316 events_check_enabled = false;
320 platform_leave(platform_mode);
326 system_state = SYSTEM_RUNNING;
330 suspend_enable_secondary_cpus();
332 /* Allow architectures to do nosmt-specific post-resume dances */
334 error = arch_resume_nosmt();
337 platform_finish(platform_mode);
339 dpm_resume_start(in_suspend ?
340 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
346 * hibernation_snapshot - Quiesce devices and create a hibernation image.
347 * @platform_mode: If set, use platform driver to prepare for the transition.
349 * This routine must be called with system_transition_mutex held.
351 int hibernation_snapshot(int platform_mode)
356 pm_suspend_clear_flags();
357 error = platform_begin(platform_mode);
361 /* Preallocate image memory before shutting down devices. */
362 error = hibernate_preallocate_memory();
366 error = freeze_kernel_threads();
370 if (hibernation_test(TEST_FREEZER)) {
373 * Indicate to the caller that we are returning due to a
374 * successful freezer test.
376 freezer_test_done = true;
380 error = dpm_prepare(PMSG_FREEZE);
382 dpm_complete(PMSG_RECOVER);
387 pm_restrict_gfp_mask();
389 error = dpm_suspend(PMSG_FREEZE);
391 if (error || hibernation_test(TEST_DEVICES))
392 platform_recover(platform_mode);
394 error = create_image(platform_mode);
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.
402 /* We may need to release the preallocated image pages here. */
403 if (error || !in_suspend)
406 msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE;
409 if (error || !in_suspend)
410 pm_restore_gfp_mask();
416 platform_end(platform_mode);
420 thaw_kernel_threads();
426 int __weak hibernate_resume_nonboot_cpu_disable(void)
428 return suspend_disable_secondary_cpus();
432 * resume_target_kernel - Restore system state from a hibernation image.
433 * @platform_mode: Whether or not to use the platform driver.
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.
440 static int resume_target_kernel(bool platform_mode)
444 error = dpm_suspend_end(PMSG_QUIESCE);
446 pr_err("Some devices failed to power down, aborting resume\n");
450 error = platform_pre_restore(platform_mode);
454 error = hibernate_resume_nonboot_cpu_disable();
459 system_state = SYSTEM_SUSPEND;
461 error = syscore_suspend();
465 save_processor_state();
466 error = restore_highmem();
468 error = swsusp_arch_resume();
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.
476 * This call to restore_highmem() reverts the changes made by
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.
487 restore_processor_state();
488 touch_softlockup_watchdog();
493 system_state = SYSTEM_RUNNING;
497 suspend_enable_secondary_cpus();
500 platform_restore_cleanup(platform_mode);
502 dpm_resume_start(PMSG_RECOVER);
508 * hibernation_restore - Quiesce devices and restore from a hibernation image.
509 * @platform_mode: If set, use platform driver to prepare for the transition.
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().
515 int hibernation_restore(int platform_mode)
519 pm_prepare_console();
521 pm_restrict_gfp_mask();
522 error = dpm_suspend_start(PMSG_QUIESCE);
524 error = resume_target_kernel(platform_mode);
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.
532 dpm_resume_end(PMSG_RECOVER);
533 pm_restore_gfp_mask();
535 pm_restore_console();
540 * hibernation_platform_enter - Power off the system using the platform driver.
542 int hibernation_platform_enter(void)
546 if (!hibernation_ops)
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
554 error = hibernation_ops->begin(PMSG_HIBERNATE);
558 entering_platform_hibernation = true;
560 error = dpm_suspend_start(PMSG_HIBERNATE);
562 if (hibernation_ops->recover)
563 hibernation_ops->recover();
567 error = dpm_suspend_end(PMSG_HIBERNATE);
571 error = hibernation_ops->prepare();
573 goto Platform_finish;
575 error = suspend_disable_secondary_cpus();
580 system_state = SYSTEM_SUSPEND;
582 if (pm_wakeup_pending()) {
587 hibernation_ops->enter();
588 /* We should never get here */
593 system_state = SYSTEM_RUNNING;
597 suspend_enable_secondary_cpus();
600 hibernation_ops->finish();
602 dpm_resume_start(PMSG_RESTORE);
605 entering_platform_hibernation = false;
606 dpm_resume_end(PMSG_RESTORE);
610 hibernation_ops->end();
616 * power_down - Shut the machine down for hibernation.
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.
622 static void power_down(void)
624 #ifdef CONFIG_SUSPEND
627 if (hibernation_mode == HIBERNATION_SUSPEND) {
628 error = suspend_devices_and_enter(PM_SUSPEND_MEM);
630 hibernation_mode = hibernation_ops ?
631 HIBERNATION_PLATFORM :
632 HIBERNATION_SHUTDOWN;
634 /* Restore swap signature. */
635 error = swsusp_unmark();
637 pr_err("Swap will be unusable! Try swapon -a.\n");
644 switch (hibernation_mode) {
645 case HIBERNATION_REBOOT:
646 kernel_restart(NULL);
648 case HIBERNATION_PLATFORM:
649 hibernation_platform_enter();
651 case HIBERNATION_SHUTDOWN:
658 * Valid image is on the disk, if we continue we risk serious data
659 * corruption after resume.
661 pr_crit("Power down manually\n");
666 static int load_image_and_restore(void)
671 pm_pr_dbg("Loading hibernation image.\n");
673 lock_device_hotplug();
674 error = create_basic_memory_bitmaps();
678 error = swsusp_read(&flags);
679 swsusp_close(FMODE_READ);
681 hibernation_restore(flags & SF_PLATFORM_MODE);
683 pr_err("Failed to load image, recovering.\n");
685 free_basic_memory_bitmaps();
687 unlock_device_hotplug();
693 * hibernate - Carry out system hibernation, including saving the image.
697 int error, nr_calls = 0;
698 bool snapshot_test = false;
700 if (!hibernation_available()) {
701 pm_pr_dbg("Hibernation not available.\n");
706 /* The snapshot device should not be opened while we're running */
707 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
712 pr_info("hibernation entry\n");
713 pm_prepare_console();
714 error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
722 error = freeze_processes();
726 lock_device_hotplug();
727 /* Allocate memory management structures */
728 error = create_basic_memory_bitmaps();
732 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
733 if (error || freezer_test_done)
737 unsigned int flags = 0;
739 if (hibernation_mode == HIBERNATION_PLATFORM)
740 flags |= SF_PLATFORM_MODE;
742 flags |= SF_NOCOMPRESS_MODE;
744 flags |= SF_CRC32_MODE;
746 pm_pr_dbg("Writing hibernation image.\n");
747 error = swsusp_write(flags);
750 if (hibernation_mode == HIBERNATION_TEST_RESUME)
751 snapshot_test = true;
756 pm_restore_gfp_mask();
758 pm_pr_dbg("Hibernation image restored successfully.\n");
762 free_basic_memory_bitmaps();
764 unlock_device_hotplug();
766 pm_pr_dbg("Checking hibernation image\n");
767 error = swsusp_check();
769 error = load_image_and_restore();
773 /* Don't bother checking whether freezer_test_done is true */
774 freezer_test_done = false;
776 __pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL);
777 pm_restore_console();
778 atomic_inc(&snapshot_device_available);
780 unlock_system_sleep();
781 pr_info("hibernation exit\n");
788 * software_resume - Resume from a saved hibernation image.
790 * This routine is called as a late initcall, when all devices have been
791 * discovered and initialized already.
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.
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
802 static int software_resume(void)
804 int error, nr_calls = 0;
807 * If the user said "noresume".. bail out early.
809 if (noresume || !hibernation_available())
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.
822 mutex_lock_nested(&system_transition_mutex, SINGLE_DEPTH_NESTING);
824 if (swsusp_resume_device)
827 if (!strlen(resume_file)) {
832 pm_pr_dbg("Checking hibernation image partition %s\n", resume_file);
835 pr_info("Waiting %dsec before reading resume device ...\n",
837 ssleep(resume_delay);
840 /* Check if the device is there */
841 swsusp_resume_device = name_to_dev_t(resume_file);
844 * name_to_dev_t is ineffective to verify parition if resume_file is in
845 * integer format. (e.g. major:minor)
847 if (isdigit(resume_file[0]) && resume_wait) {
849 while (!get_gendisk(swsusp_resume_device, &partno))
853 if (!swsusp_resume_device) {
855 * Some device discovery might still be in progress; we need
856 * to wait for this to finish.
858 wait_for_device_probe();
861 while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
863 async_synchronize_full();
866 swsusp_resume_device = name_to_dev_t(resume_file);
867 if (!swsusp_resume_device) {
874 pm_pr_dbg("Hibernation image partition %d:%d present\n",
875 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
877 pm_pr_dbg("Looking for hibernation image.\n");
878 error = swsusp_check();
882 /* The snapshot device should not be opened while we're running */
883 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
885 swsusp_close(FMODE_READ);
889 pr_info("resume from hibernation\n");
890 pm_prepare_console();
891 error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls);
897 pm_pr_dbg("Preparing processes for hibernation restore.\n");
898 error = freeze_processes();
901 error = load_image_and_restore();
904 __pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
905 pm_restore_console();
906 pr_info("resume failed (%d)\n", error);
907 atomic_inc(&snapshot_device_available);
908 /* For success case, the suspend path will release the lock */
910 mutex_unlock(&system_transition_mutex);
911 pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
914 swsusp_close(FMODE_READ);
918 late_initcall_sync(software_resume);
921 static 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",
928 [HIBERNATION_TEST_RESUME] = "test_resume",
932 * /sys/power/disk - Control hibernation mode.
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
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:
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.
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.
957 static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
963 if (!hibernation_available())
964 return sprintf(buf, "[disabled]\n");
966 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
967 if (!hibernation_modes[i])
970 case HIBERNATION_SHUTDOWN:
971 case HIBERNATION_REBOOT:
972 #ifdef CONFIG_SUSPEND
973 case HIBERNATION_SUSPEND:
975 case HIBERNATION_TEST_RESUME:
977 case HIBERNATION_PLATFORM:
980 /* not a valid mode, continue with loop */
983 if (i == hibernation_mode)
984 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
986 buf += sprintf(buf, "%s ", hibernation_modes[i]);
988 buf += sprintf(buf, "\n");
992 static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
993 const char *buf, size_t n)
999 int mode = HIBERNATION_INVALID;
1001 if (!hibernation_available())
1004 p = memchr(buf, '\n', n);
1005 len = p ? p - buf : n;
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)) {
1015 if (mode != HIBERNATION_INVALID) {
1017 case HIBERNATION_SHUTDOWN:
1018 case HIBERNATION_REBOOT:
1019 #ifdef CONFIG_SUSPEND
1020 case HIBERNATION_SUSPEND:
1022 case HIBERNATION_TEST_RESUME:
1023 hibernation_mode = mode;
1025 case HIBERNATION_PLATFORM:
1026 if (hibernation_ops)
1027 hibernation_mode = mode;
1035 pm_pr_dbg("Hibernation mode set to '%s'\n",
1036 hibernation_modes[mode]);
1037 unlock_system_sleep();
1038 return error ? error : n;
1043 static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
1046 return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
1047 MINOR(swsusp_resume_device));
1050 static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
1051 const char *buf, size_t n)
1057 if (len && buf[len-1] == '\n')
1059 name = kstrndup(buf, len, GFP_KERNEL);
1063 res = name_to_dev_t(name);
1068 lock_system_sleep();
1069 swsusp_resume_device = res;
1070 unlock_system_sleep();
1071 pm_pr_dbg("Configured hibernation resume from disk to %u\n",
1072 swsusp_resume_device);
1080 static ssize_t resume_offset_show(struct kobject *kobj,
1081 struct kobj_attribute *attr, char *buf)
1083 return sprintf(buf, "%llu\n", (unsigned long long)swsusp_resume_block);
1086 static ssize_t resume_offset_store(struct kobject *kobj,
1087 struct kobj_attribute *attr, const char *buf,
1090 unsigned long long offset;
1093 rc = kstrtoull(buf, 0, &offset);
1096 swsusp_resume_block = offset;
1101 power_attr(resume_offset);
1103 static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
1106 return sprintf(buf, "%lu\n", image_size);
1109 static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
1110 const char *buf, size_t n)
1114 if (sscanf(buf, "%lu", &size) == 1) {
1122 power_attr(image_size);
1124 static ssize_t reserved_size_show(struct kobject *kobj,
1125 struct kobj_attribute *attr, char *buf)
1127 return sprintf(buf, "%lu\n", reserved_size);
1130 static ssize_t reserved_size_store(struct kobject *kobj,
1131 struct kobj_attribute *attr,
1132 const char *buf, size_t n)
1136 if (sscanf(buf, "%lu", &size) == 1) {
1137 reserved_size = size;
1144 power_attr(reserved_size);
1146 static struct attribute * g[] = {
1148 &resume_offset_attr.attr,
1150 &image_size_attr.attr,
1151 &reserved_size_attr.attr,
1156 static const struct attribute_group attr_group = {
1161 static int __init pm_disk_init(void)
1163 return sysfs_create_group(power_kobj, &attr_group);
1166 core_initcall(pm_disk_init);
1169 static int __init resume_setup(char *str)
1174 strncpy( resume_file, str, 255 );
1178 static int __init resume_offset_setup(char *str)
1180 unsigned long long offset;
1185 if (sscanf(str, "%llu", &offset) == 1)
1186 swsusp_resume_block = offset;
1191 static int __init hibernate_setup(char *str)
1193 if (!strncmp(str, "noresume", 8)) {
1195 } else if (!strncmp(str, "nocompress", 10)) {
1197 } else if (!strncmp(str, "no", 2)) {
1200 } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)
1201 && !strncmp(str, "protect_image", 13)) {
1202 enable_restore_image_protection();
1207 static int __init noresume_setup(char *str)
1213 static int __init resumewait_setup(char *str)
1219 static int __init resumedelay_setup(char *str)
1221 int rc = kstrtouint(str, 0, &resume_delay);
1228 static int __init nohibernate_setup(char *str)
1235 __setup("noresume", noresume_setup);
1236 __setup("resume_offset=", resume_offset_setup);
1237 __setup("resume=", resume_setup);
1238 __setup("hibernate=", hibernate_setup);
1239 __setup("resumewait", resumewait_setup);
1240 __setup("resumedelay=", resumedelay_setup);
1241 __setup("nohibernate", nohibernate_setup);