2 * kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support.
4 * Copyright (c) 2003 Patrick Mochel
5 * Copyright (c) 2003 Open Source Development Lab
6 * Copyright (c) 2004 Pavel Machek <pavel@ucw.cz>
7 * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.
8 * Copyright (C) 2012 Bojan Smojver <bojan@rexursive.com>
10 * This file is released under the GPLv2.
13 #include <linux/export.h>
14 #include <linux/suspend.h>
15 #include <linux/syscalls.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/console.h>
25 #include <linux/cpu.h>
26 #include <linux/freezer.h>
27 #include <linux/gfp.h>
28 #include <linux/syscore_ops.h>
29 #include <linux/ctype.h>
30 #include <linux/genhd.h>
31 #include <linux/ktime.h>
32 #include <trace/events/power.h>
37 static int nocompress;
39 static int nohibernate;
40 static int resume_wait;
41 static unsigned int resume_delay;
42 static char resume_file[256] = CONFIG_PM_STD_PARTITION;
43 dev_t swsusp_resume_device;
44 sector_t swsusp_resume_block;
45 __visible int in_suspend __nosavedata;
55 HIBERNATION_TEST_RESUME,
57 __HIBERNATION_AFTER_LAST
59 #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
60 #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
62 static int hibernation_mode = HIBERNATION_SHUTDOWN;
64 bool freezer_test_done;
66 static const struct platform_hibernation_ops *hibernation_ops;
68 bool hibernation_available(void)
70 return (nohibernate == 0);
74 * hibernation_set_ops - Set the global hibernate operations.
75 * @ops: Hibernation operations to use in subsequent hibernation transitions.
77 void hibernation_set_ops(const struct platform_hibernation_ops *ops)
79 if (ops && !(ops->begin && ops->end && ops->pre_snapshot
80 && ops->prepare && ops->finish && ops->enter && ops->pre_restore
81 && ops->restore_cleanup && ops->leave)) {
86 hibernation_ops = ops;
88 hibernation_mode = HIBERNATION_PLATFORM;
89 else if (hibernation_mode == HIBERNATION_PLATFORM)
90 hibernation_mode = HIBERNATION_SHUTDOWN;
92 unlock_system_sleep();
94 EXPORT_SYMBOL_GPL(hibernation_set_ops);
96 static bool entering_platform_hibernation;
98 bool system_entering_hibernation(void)
100 return entering_platform_hibernation;
102 EXPORT_SYMBOL(system_entering_hibernation);
104 #ifdef CONFIG_PM_DEBUG
105 static void hibernation_debug_sleep(void)
107 printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n");
111 static int hibernation_test(int level)
113 if (pm_test_level == level) {
114 hibernation_debug_sleep();
119 #else /* !CONFIG_PM_DEBUG */
120 static int hibernation_test(int level) { return 0; }
121 #endif /* !CONFIG_PM_DEBUG */
124 * platform_begin - Call platform to start hibernation.
125 * @platform_mode: Whether or not to use the platform driver.
127 static int platform_begin(int platform_mode)
129 return (platform_mode && hibernation_ops) ?
130 hibernation_ops->begin() : 0;
134 * platform_end - Call platform to finish transition to the working state.
135 * @platform_mode: Whether or not to use the platform driver.
137 static void platform_end(int platform_mode)
139 if (platform_mode && hibernation_ops)
140 hibernation_ops->end();
144 * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
145 * @platform_mode: Whether or not to use the platform driver.
147 * Use the platform driver to prepare the system for creating a hibernate image,
148 * if so configured, and return an error code if that fails.
151 static int platform_pre_snapshot(int platform_mode)
153 return (platform_mode && hibernation_ops) ?
154 hibernation_ops->pre_snapshot() : 0;
158 * platform_leave - Call platform to prepare a transition to the working state.
159 * @platform_mode: Whether or not to use the platform driver.
161 * Use the platform driver prepare to prepare the machine for switching to the
162 * normal mode of operation.
164 * This routine is called on one CPU with interrupts disabled.
166 static void platform_leave(int platform_mode)
168 if (platform_mode && hibernation_ops)
169 hibernation_ops->leave();
173 * platform_finish - Call platform to switch the system to the working state.
174 * @platform_mode: Whether or not to use the platform driver.
176 * Use the platform driver to switch the machine to the normal mode of
179 * This routine must be called after platform_prepare().
181 static void platform_finish(int platform_mode)
183 if (platform_mode && hibernation_ops)
184 hibernation_ops->finish();
188 * platform_pre_restore - Prepare for hibernate image restoration.
189 * @platform_mode: Whether or not to use the platform driver.
191 * Use the platform driver to prepare the system for resume from a hibernation
194 * If the restore fails after this function has been called,
195 * platform_restore_cleanup() must be called.
197 static int platform_pre_restore(int platform_mode)
199 return (platform_mode && hibernation_ops) ?
200 hibernation_ops->pre_restore() : 0;
204 * platform_restore_cleanup - Switch to the working state after failing restore.
205 * @platform_mode: Whether or not to use the platform driver.
207 * Use the platform driver to switch the system to the normal mode of operation
208 * after a failing restore.
210 * If platform_pre_restore() has been called before the failing restore, this
211 * function must be called too, regardless of the result of
212 * platform_pre_restore().
214 static void platform_restore_cleanup(int platform_mode)
216 if (platform_mode && hibernation_ops)
217 hibernation_ops->restore_cleanup();
221 * platform_recover - Recover from a failure to suspend devices.
222 * @platform_mode: Whether or not to use the platform driver.
224 static void platform_recover(int platform_mode)
226 if (platform_mode && hibernation_ops && hibernation_ops->recover)
227 hibernation_ops->recover();
231 * swsusp_show_speed - Print time elapsed between two events during hibernation.
232 * @start: Starting event.
233 * @stop: Final event.
234 * @nr_pages: Number of memory pages processed between @start and @stop.
235 * @msg: Additional diagnostic message to print.
237 void swsusp_show_speed(ktime_t start, ktime_t stop,
238 unsigned nr_pages, char *msg)
241 u64 elapsed_centisecs64;
242 unsigned int centisecs;
246 diff = ktime_sub(stop, start);
247 elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC);
248 centisecs = elapsed_centisecs64;
250 centisecs = 1; /* avoid div-by-zero */
251 k = nr_pages * (PAGE_SIZE / 1024);
252 kps = (k * 100) / centisecs;
253 printk(KERN_INFO "PM: %s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n",
255 centisecs / 100, centisecs % 100,
256 kps / 1000, (kps % 1000) / 10);
259 __weak int arch_resume_nosmt(void)
265 * create_image - Create a hibernation image.
266 * @platform_mode: Whether or not to use the platform driver.
268 * Execute device drivers' "late" and "noirq" freeze callbacks, create a
269 * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
271 * Control reappears in this routine after the subsequent restore.
273 static int create_image(int platform_mode)
277 error = dpm_suspend_end(PMSG_FREEZE);
279 printk(KERN_ERR "PM: Some devices failed to power down, "
280 "aborting hibernation\n");
284 error = platform_pre_snapshot(platform_mode);
285 if (error || hibernation_test(TEST_PLATFORM))
286 goto Platform_finish;
288 error = disable_nonboot_cpus();
289 if (error || hibernation_test(TEST_CPUS))
294 error = syscore_suspend();
296 printk(KERN_ERR "PM: Some system devices failed to power down, "
297 "aborting hibernation\n");
301 if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
305 save_processor_state();
306 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
307 error = swsusp_arch_suspend();
308 /* Restore control flow magically appears here */
309 restore_processor_state();
310 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
312 printk(KERN_ERR "PM: Error %d creating hibernation image\n",
315 events_check_enabled = false;
319 platform_leave(platform_mode);
328 enable_nonboot_cpus();
330 /* Allow architectures to do nosmt-specific post-resume dances */
332 error = arch_resume_nosmt();
335 platform_finish(platform_mode);
337 dpm_resume_start(in_suspend ?
338 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
344 * hibernation_snapshot - Quiesce devices and create a hibernation image.
345 * @platform_mode: If set, use platform driver to prepare for the transition.
347 * This routine must be called with pm_mutex held.
349 int hibernation_snapshot(int platform_mode)
354 pm_suspend_clear_flags();
355 error = platform_begin(platform_mode);
359 /* Preallocate image memory before shutting down devices. */
360 error = hibernate_preallocate_memory();
364 error = freeze_kernel_threads();
368 if (hibernation_test(TEST_FREEZER)) {
371 * Indicate to the caller that we are returning due to a
372 * successful freezer test.
374 freezer_test_done = true;
378 error = dpm_prepare(PMSG_FREEZE);
380 dpm_complete(PMSG_RECOVER);
385 pm_restrict_gfp_mask();
387 error = dpm_suspend(PMSG_FREEZE);
389 if (error || hibernation_test(TEST_DEVICES))
390 platform_recover(platform_mode);
392 error = create_image(platform_mode);
395 * In the case that we call create_image() above, the control
396 * returns here (1) after the image has been created or the
397 * image creation has failed and (2) after a successful restore.
400 /* We may need to release the preallocated image pages here. */
401 if (error || !in_suspend)
404 msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE;
407 if (error || !in_suspend)
408 pm_restore_gfp_mask();
414 platform_end(platform_mode);
418 thaw_kernel_threads();
424 int __weak hibernate_resume_nonboot_cpu_disable(void)
426 return disable_nonboot_cpus();
430 * resume_target_kernel - Restore system state from a hibernation image.
431 * @platform_mode: Whether or not to use the platform driver.
433 * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
434 * contents of highmem that have not been restored yet from the image and run
435 * the low-level code that will restore the remaining contents of memory and
436 * switch to the just restored target kernel.
438 static int resume_target_kernel(bool platform_mode)
442 error = dpm_suspend_end(PMSG_QUIESCE);
444 printk(KERN_ERR "PM: Some devices failed to power down, "
445 "aborting resume\n");
449 error = platform_pre_restore(platform_mode);
453 error = hibernate_resume_nonboot_cpu_disable();
459 error = syscore_suspend();
463 save_processor_state();
464 error = restore_highmem();
466 error = swsusp_arch_resume();
468 * The code below is only ever reached in case of a failure.
469 * Otherwise, execution continues at the place where
470 * swsusp_arch_suspend() was called.
474 * This call to restore_highmem() reverts the changes made by
480 * The only reason why swsusp_arch_resume() can fail is memory being
481 * very tight, so we have to free it as soon as we can to avoid
482 * subsequent failures.
485 restore_processor_state();
486 touch_softlockup_watchdog();
494 enable_nonboot_cpus();
497 platform_restore_cleanup(platform_mode);
499 dpm_resume_start(PMSG_RECOVER);
505 * hibernation_restore - Quiesce devices and restore from a hibernation image.
506 * @platform_mode: If set, use platform driver to prepare for the transition.
508 * This routine must be called with pm_mutex held. If it is successful, control
509 * reappears in the restored target kernel in hibernation_snapshot().
511 int hibernation_restore(int platform_mode)
515 pm_prepare_console();
517 pm_restrict_gfp_mask();
518 error = dpm_suspend_start(PMSG_QUIESCE);
520 error = resume_target_kernel(platform_mode);
522 * The above should either succeed and jump to the new kernel,
523 * or return with an error. Otherwise things are just
524 * undefined, so let's be paranoid.
528 dpm_resume_end(PMSG_RECOVER);
529 pm_restore_gfp_mask();
531 pm_restore_console();
536 * hibernation_platform_enter - Power off the system using the platform driver.
538 int hibernation_platform_enter(void)
542 if (!hibernation_ops)
546 * We have cancelled the power transition by running
547 * hibernation_ops->finish() before saving the image, so we should let
548 * the firmware know that we're going to enter the sleep state after all
550 error = hibernation_ops->begin();
554 entering_platform_hibernation = true;
556 error = dpm_suspend_start(PMSG_HIBERNATE);
558 if (hibernation_ops->recover)
559 hibernation_ops->recover();
563 error = dpm_suspend_end(PMSG_HIBERNATE);
567 error = hibernation_ops->prepare();
569 goto Platform_finish;
571 error = disable_nonboot_cpus();
577 if (pm_wakeup_pending()) {
582 hibernation_ops->enter();
583 /* We should never get here */
591 enable_nonboot_cpus();
594 hibernation_ops->finish();
596 dpm_resume_start(PMSG_RESTORE);
599 entering_platform_hibernation = false;
600 dpm_resume_end(PMSG_RESTORE);
604 hibernation_ops->end();
610 * power_down - Shut the machine down for hibernation.
612 * Use the platform driver, if configured, to put the system into the sleep
613 * state corresponding to hibernation, or try to power it off or reboot,
614 * depending on the value of hibernation_mode.
616 static void power_down(void)
618 #ifdef CONFIG_SUSPEND
622 switch (hibernation_mode) {
623 case HIBERNATION_REBOOT:
624 kernel_restart(NULL);
626 case HIBERNATION_PLATFORM:
627 hibernation_platform_enter();
628 case HIBERNATION_SHUTDOWN:
632 #ifdef CONFIG_SUSPEND
633 case HIBERNATION_SUSPEND:
634 error = suspend_devices_and_enter(PM_SUSPEND_MEM);
637 hibernation_mode = HIBERNATION_PLATFORM;
639 hibernation_mode = HIBERNATION_SHUTDOWN;
643 * Restore swap signature.
645 error = swsusp_unmark();
647 printk(KERN_ERR "PM: Swap will be unusable! "
654 * Valid image is on the disk, if we continue we risk serious data
655 * corruption after resume.
657 printk(KERN_CRIT "PM: Please power down manually\n");
662 static int load_image_and_restore(void)
667 pr_debug("PM: Loading hibernation image.\n");
669 lock_device_hotplug();
670 error = create_basic_memory_bitmaps();
674 error = swsusp_read(&flags);
675 swsusp_close(FMODE_READ | FMODE_EXCL);
677 hibernation_restore(flags & SF_PLATFORM_MODE);
679 printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n");
681 free_basic_memory_bitmaps();
683 unlock_device_hotplug();
689 * hibernate - Carry out system hibernation, including saving the image.
693 int error, nr_calls = 0;
694 bool snapshot_test = false;
696 if (!hibernation_available()) {
697 pr_debug("PM: Hibernation not available.\n");
702 /* The snapshot device should not be opened while we're running */
703 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
708 pm_prepare_console();
709 error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
715 printk(KERN_INFO "PM: Syncing filesystems ... ");
719 error = freeze_processes();
723 lock_device_hotplug();
724 /* Allocate memory management structures */
725 error = create_basic_memory_bitmaps();
729 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
730 if (error || freezer_test_done)
734 unsigned int flags = 0;
736 if (hibernation_mode == HIBERNATION_PLATFORM)
737 flags |= SF_PLATFORM_MODE;
739 flags |= SF_NOCOMPRESS_MODE;
741 flags |= SF_CRC32_MODE;
743 pr_debug("PM: writing image.\n");
744 error = swsusp_write(flags);
747 if (hibernation_mode == HIBERNATION_TEST_RESUME)
748 snapshot_test = true;
753 pm_restore_gfp_mask();
755 pr_debug("PM: Image restored successfully.\n");
759 free_basic_memory_bitmaps();
761 unlock_device_hotplug();
763 pr_debug("PM: Checking hibernation image\n");
764 error = swsusp_check();
766 error = load_image_and_restore();
770 /* Don't bother checking whether freezer_test_done is true */
771 freezer_test_done = false;
773 __pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL);
774 pm_restore_console();
775 atomic_inc(&snapshot_device_available);
777 unlock_system_sleep();
783 * software_resume - Resume from a saved hibernation image.
785 * This routine is called as a late initcall, when all devices have been
786 * discovered and initialized already.
788 * The image reading code is called to see if there is a hibernation image
789 * available for reading. If that is the case, devices are quiesced and the
790 * contents of memory is restored from the saved image.
792 * If this is successful, control reappears in the restored target kernel in
793 * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
794 * attempts to recover gracefully and make the kernel return to the normal mode
797 static int software_resume(void)
799 int error, nr_calls = 0;
802 * If the user said "noresume".. bail out early.
804 if (noresume || !hibernation_available())
808 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
809 * is configured into the kernel. Since the regular hibernate
810 * trigger path is via sysfs which takes a buffer mutex before
811 * calling hibernate functions (which take pm_mutex) this can
812 * cause lockdep to complain about a possible ABBA deadlock
813 * which cannot happen since we're in the boot code here and
814 * sysfs can't be invoked yet. Therefore, we use a subclass
815 * here to avoid lockdep complaining.
817 mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING);
819 if (swsusp_resume_device)
822 if (!strlen(resume_file)) {
827 pr_debug("PM: Checking hibernation image partition %s\n", resume_file);
830 printk(KERN_INFO "Waiting %dsec before reading resume device...\n",
832 ssleep(resume_delay);
835 /* Check if the device is there */
836 swsusp_resume_device = name_to_dev_t(resume_file);
837 if (!swsusp_resume_device) {
839 * Some device discovery might still be in progress; we need
840 * to wait for this to finish.
842 wait_for_device_probe();
845 while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
847 async_synchronize_full();
850 swsusp_resume_device = name_to_dev_t(resume_file);
851 if (!swsusp_resume_device) {
858 pr_debug("PM: Hibernation image partition %d:%d present\n",
859 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
861 pr_debug("PM: Looking for hibernation image.\n");
862 error = swsusp_check();
866 /* The snapshot device should not be opened while we're running */
867 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
869 swsusp_close(FMODE_READ | FMODE_EXCL);
873 pm_prepare_console();
874 error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls);
880 pr_debug("PM: Preparing processes for restore.\n");
881 error = freeze_processes();
885 error = freeze_kernel_threads();
891 error = load_image_and_restore();
894 __pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
895 pm_restore_console();
896 atomic_inc(&snapshot_device_available);
897 /* For success case, the suspend path will release the lock */
899 mutex_unlock(&pm_mutex);
900 pr_debug("PM: Hibernation image not present or could not be loaded.\n");
903 swsusp_close(FMODE_READ | FMODE_EXCL);
907 late_initcall_sync(software_resume);
910 static const char * const hibernation_modes[] = {
911 [HIBERNATION_PLATFORM] = "platform",
912 [HIBERNATION_SHUTDOWN] = "shutdown",
913 [HIBERNATION_REBOOT] = "reboot",
914 #ifdef CONFIG_SUSPEND
915 [HIBERNATION_SUSPEND] = "suspend",
917 [HIBERNATION_TEST_RESUME] = "test_resume",
921 * /sys/power/disk - Control hibernation mode.
923 * Hibernation can be handled in several ways. There are a few different ways
924 * to put the system into the sleep state: using the platform driver (e.g. ACPI
925 * or other hibernation_ops), powering it off or rebooting it (for testing
928 * The sysfs file /sys/power/disk provides an interface for selecting the
929 * hibernation mode to use. Reading from this file causes the available modes
930 * to be printed. There are 3 modes that can be supported:
936 * If a platform hibernation driver is in use, 'platform' will be supported
937 * and will be used by default. Otherwise, 'shutdown' will be used by default.
938 * The selected option (i.e. the one corresponding to the current value of
939 * hibernation_mode) is enclosed by a square bracket.
941 * To select a given hibernation mode it is necessary to write the mode's
942 * string representation (as returned by reading from /sys/power/disk) back
943 * into /sys/power/disk.
946 static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
952 if (!hibernation_available())
953 return sprintf(buf, "[disabled]\n");
955 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
956 if (!hibernation_modes[i])
959 case HIBERNATION_SHUTDOWN:
960 case HIBERNATION_REBOOT:
961 #ifdef CONFIG_SUSPEND
962 case HIBERNATION_SUSPEND:
964 case HIBERNATION_TEST_RESUME:
966 case HIBERNATION_PLATFORM:
969 /* not a valid mode, continue with loop */
972 if (i == hibernation_mode)
973 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
975 buf += sprintf(buf, "%s ", hibernation_modes[i]);
977 buf += sprintf(buf, "\n");
981 static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
982 const char *buf, size_t n)
988 int mode = HIBERNATION_INVALID;
990 if (!hibernation_available())
993 p = memchr(buf, '\n', n);
994 len = p ? p - buf : n;
997 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
998 if (len == strlen(hibernation_modes[i])
999 && !strncmp(buf, hibernation_modes[i], len)) {
1004 if (mode != HIBERNATION_INVALID) {
1006 case HIBERNATION_SHUTDOWN:
1007 case HIBERNATION_REBOOT:
1008 #ifdef CONFIG_SUSPEND
1009 case HIBERNATION_SUSPEND:
1011 case HIBERNATION_TEST_RESUME:
1012 hibernation_mode = mode;
1014 case HIBERNATION_PLATFORM:
1015 if (hibernation_ops)
1016 hibernation_mode = mode;
1024 pr_debug("PM: Hibernation mode set to '%s'\n",
1025 hibernation_modes[mode]);
1026 unlock_system_sleep();
1027 return error ? error : n;
1032 static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
1035 return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
1036 MINOR(swsusp_resume_device));
1039 static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
1040 const char *buf, size_t n)
1046 if (len && buf[len-1] == '\n')
1048 name = kstrndup(buf, len, GFP_KERNEL);
1052 res = name_to_dev_t(name);
1057 lock_system_sleep();
1058 swsusp_resume_device = res;
1059 unlock_system_sleep();
1060 printk(KERN_INFO "PM: Starting manual resume from disk\n");
1068 static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
1071 return sprintf(buf, "%lu\n", image_size);
1074 static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
1075 const char *buf, size_t n)
1079 if (sscanf(buf, "%lu", &size) == 1) {
1087 power_attr(image_size);
1089 static ssize_t reserved_size_show(struct kobject *kobj,
1090 struct kobj_attribute *attr, char *buf)
1092 return sprintf(buf, "%lu\n", reserved_size);
1095 static ssize_t reserved_size_store(struct kobject *kobj,
1096 struct kobj_attribute *attr,
1097 const char *buf, size_t n)
1101 if (sscanf(buf, "%lu", &size) == 1) {
1102 reserved_size = size;
1109 power_attr(reserved_size);
1111 static struct attribute * g[] = {
1114 &image_size_attr.attr,
1115 &reserved_size_attr.attr,
1120 static struct attribute_group attr_group = {
1125 static int __init pm_disk_init(void)
1127 return sysfs_create_group(power_kobj, &attr_group);
1130 core_initcall(pm_disk_init);
1133 static int __init resume_setup(char *str)
1138 strncpy( resume_file, str, 255 );
1142 static int __init resume_offset_setup(char *str)
1144 unsigned long long offset;
1149 if (sscanf(str, "%llu", &offset) == 1)
1150 swsusp_resume_block = offset;
1155 static int __init hibernate_setup(char *str)
1157 if (!strncmp(str, "noresume", 8)) {
1159 } else if (!strncmp(str, "nocompress", 10)) {
1161 } else if (!strncmp(str, "no", 2)) {
1164 } else if (IS_ENABLED(CONFIG_DEBUG_RODATA)
1165 && !strncmp(str, "protect_image", 13)) {
1166 enable_restore_image_protection();
1171 static int __init noresume_setup(char *str)
1177 static int __init resumewait_setup(char *str)
1183 static int __init resumedelay_setup(char *str)
1185 int rc = kstrtouint(str, 0, &resume_delay);
1192 static int __init nohibernate_setup(char *str)
1199 __setup("noresume", noresume_setup);
1200 __setup("resume_offset=", resume_offset_setup);
1201 __setup("resume=", resume_setup);
1202 __setup("hibernate=", hibernate_setup);
1203 __setup("resumewait", resumewait_setup);
1204 __setup("resumedelay=", resumedelay_setup);
1205 __setup("nohibernate", nohibernate_setup);