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 #define pr_fmt(fmt) "PM: " fmt
15 #include <linux/export.h>
16 #include <linux/suspend.h>
17 #include <linux/syscalls.h>
18 #include <linux/reboot.h>
19 #include <linux/string.h>
20 #include <linux/device.h>
21 #include <linux/async.h>
22 #include <linux/delay.h>
24 #include <linux/mount.h>
26 #include <linux/nmi.h>
27 #include <linux/console.h>
28 #include <linux/cpu.h>
29 #include <linux/freezer.h>
30 #include <linux/gfp.h>
31 #include <linux/syscore_ops.h>
32 #include <linux/ctype.h>
33 #include <linux/genhd.h>
34 #include <linux/ktime.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 bool hibernation_available(void)
73 return (nohibernate == 0);
77 * hibernation_set_ops - Set the global hibernate operations.
78 * @ops: Hibernation operations to use in subsequent hibernation transitions.
80 void hibernation_set_ops(const struct platform_hibernation_ops *ops)
82 if (ops && !(ops->begin && ops->end && ops->pre_snapshot
83 && ops->prepare && ops->finish && ops->enter && ops->pre_restore
84 && ops->restore_cleanup && ops->leave)) {
89 hibernation_ops = ops;
91 hibernation_mode = HIBERNATION_PLATFORM;
92 else if (hibernation_mode == HIBERNATION_PLATFORM)
93 hibernation_mode = HIBERNATION_SHUTDOWN;
95 unlock_system_sleep();
97 EXPORT_SYMBOL_GPL(hibernation_set_ops);
99 static bool entering_platform_hibernation;
101 bool system_entering_hibernation(void)
103 return entering_platform_hibernation;
105 EXPORT_SYMBOL(system_entering_hibernation);
107 #ifdef CONFIG_PM_DEBUG
108 static void hibernation_debug_sleep(void)
110 pr_info("hibernation debug: Waiting for 5 seconds.\n");
114 static int hibernation_test(int level)
116 if (pm_test_level == level) {
117 hibernation_debug_sleep();
122 #else /* !CONFIG_PM_DEBUG */
123 static int hibernation_test(int level) { return 0; }
124 #endif /* !CONFIG_PM_DEBUG */
127 * platform_begin - Call platform to start hibernation.
128 * @platform_mode: Whether or not to use the platform driver.
130 static int platform_begin(int platform_mode)
132 return (platform_mode && hibernation_ops) ?
133 hibernation_ops->begin() : 0;
137 * platform_end - Call platform to finish transition to the working state.
138 * @platform_mode: Whether or not to use the platform driver.
140 static void platform_end(int platform_mode)
142 if (platform_mode && hibernation_ops)
143 hibernation_ops->end();
147 * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
148 * @platform_mode: Whether or not to use the platform driver.
150 * Use the platform driver to prepare the system for creating a hibernate image,
151 * if so configured, and return an error code if that fails.
154 static int platform_pre_snapshot(int platform_mode)
156 return (platform_mode && hibernation_ops) ?
157 hibernation_ops->pre_snapshot() : 0;
161 * platform_leave - Call platform to prepare a transition to the working state.
162 * @platform_mode: Whether or not to use the platform driver.
164 * Use the platform driver prepare to prepare the machine for switching to the
165 * normal mode of operation.
167 * This routine is called on one CPU with interrupts disabled.
169 static void platform_leave(int platform_mode)
171 if (platform_mode && hibernation_ops)
172 hibernation_ops->leave();
176 * platform_finish - Call platform to switch the system to the working state.
177 * @platform_mode: Whether or not to use the platform driver.
179 * Use the platform driver to switch the machine to the normal mode of
182 * This routine must be called after platform_prepare().
184 static void platform_finish(int platform_mode)
186 if (platform_mode && hibernation_ops)
187 hibernation_ops->finish();
191 * platform_pre_restore - Prepare for hibernate image restoration.
192 * @platform_mode: Whether or not to use the platform driver.
194 * Use the platform driver to prepare the system for resume from a hibernation
197 * If the restore fails after this function has been called,
198 * platform_restore_cleanup() must be called.
200 static int platform_pre_restore(int platform_mode)
202 return (platform_mode && hibernation_ops) ?
203 hibernation_ops->pre_restore() : 0;
207 * platform_restore_cleanup - Switch to the working state after failing restore.
208 * @platform_mode: Whether or not to use the platform driver.
210 * Use the platform driver to switch the system to the normal mode of operation
211 * after a failing restore.
213 * If platform_pre_restore() has been called before the failing restore, this
214 * function must be called too, regardless of the result of
215 * platform_pre_restore().
217 static void platform_restore_cleanup(int platform_mode)
219 if (platform_mode && hibernation_ops)
220 hibernation_ops->restore_cleanup();
224 * platform_recover - Recover from a failure to suspend devices.
225 * @platform_mode: Whether or not to use the platform driver.
227 static void platform_recover(int platform_mode)
229 if (platform_mode && hibernation_ops && hibernation_ops->recover)
230 hibernation_ops->recover();
234 * swsusp_show_speed - Print time elapsed between two events during hibernation.
235 * @start: Starting event.
236 * @stop: Final event.
237 * @nr_pages: Number of memory pages processed between @start and @stop.
238 * @msg: Additional diagnostic message to print.
240 void swsusp_show_speed(ktime_t start, ktime_t stop,
241 unsigned nr_pages, char *msg)
244 u64 elapsed_centisecs64;
245 unsigned int centisecs;
249 diff = ktime_sub(stop, start);
250 elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC);
251 centisecs = elapsed_centisecs64;
253 centisecs = 1; /* avoid div-by-zero */
254 k = nr_pages * (PAGE_SIZE / 1024);
255 kps = (k * 100) / centisecs;
256 pr_info("%s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n",
257 msg, k, centisecs / 100, centisecs % 100, kps / 1000,
261 __weak int arch_resume_nosmt(void)
267 * create_image - Create a hibernation image.
268 * @platform_mode: Whether or not to use the platform driver.
270 * Execute device drivers' "late" and "noirq" freeze callbacks, create a
271 * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
273 * Control reappears in this routine after the subsequent restore.
275 static int create_image(int platform_mode)
279 error = dpm_suspend_end(PMSG_FREEZE);
281 pr_err("Some devices failed to power down, aborting hibernation\n");
285 error = platform_pre_snapshot(platform_mode);
286 if (error || hibernation_test(TEST_PLATFORM))
287 goto Platform_finish;
289 error = disable_nonboot_cpus();
290 if (error || hibernation_test(TEST_CPUS))
295 system_state = SYSTEM_SUSPEND;
297 error = syscore_suspend();
299 pr_err("Some system devices failed to power down, aborting hibernation\n");
303 if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
307 save_processor_state();
308 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
309 error = swsusp_arch_suspend();
310 /* Restore control flow magically appears here */
311 restore_processor_state();
312 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
314 pr_err("Error %d creating hibernation image\n", error);
317 events_check_enabled = false;
321 platform_leave(platform_mode);
327 system_state = SYSTEM_RUNNING;
331 enable_nonboot_cpus();
333 /* Allow architectures to do nosmt-specific post-resume dances */
335 error = arch_resume_nosmt();
338 platform_finish(platform_mode);
340 dpm_resume_start(in_suspend ?
341 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
347 * hibernation_snapshot - Quiesce devices and create a hibernation image.
348 * @platform_mode: If set, use platform driver to prepare for the transition.
350 * This routine must be called with system_transition_mutex held.
352 int hibernation_snapshot(int platform_mode)
357 pm_suspend_clear_flags();
358 error = platform_begin(platform_mode);
362 /* Preallocate image memory before shutting down devices. */
363 error = hibernate_preallocate_memory();
367 error = freeze_kernel_threads();
371 if (hibernation_test(TEST_FREEZER)) {
374 * Indicate to the caller that we are returning due to a
375 * successful freezer test.
377 freezer_test_done = true;
381 error = dpm_prepare(PMSG_FREEZE);
383 dpm_complete(PMSG_RECOVER);
388 pm_restrict_gfp_mask();
390 error = dpm_suspend(PMSG_FREEZE);
392 if (error || hibernation_test(TEST_DEVICES))
393 platform_recover(platform_mode);
395 error = create_image(platform_mode);
398 * In the case that we call create_image() above, the control
399 * returns here (1) after the image has been created or the
400 * image creation has failed and (2) after a successful restore.
403 /* We may need to release the preallocated image pages here. */
404 if (error || !in_suspend)
407 msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE;
410 if (error || !in_suspend)
411 pm_restore_gfp_mask();
417 platform_end(platform_mode);
421 thaw_kernel_threads();
427 int __weak hibernate_resume_nonboot_cpu_disable(void)
429 return disable_nonboot_cpus();
433 * resume_target_kernel - Restore system state from a hibernation image.
434 * @platform_mode: Whether or not to use the platform driver.
436 * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
437 * contents of highmem that have not been restored yet from the image and run
438 * the low-level code that will restore the remaining contents of memory and
439 * switch to the just restored target kernel.
441 static int resume_target_kernel(bool platform_mode)
445 error = dpm_suspend_end(PMSG_QUIESCE);
447 pr_err("Some devices failed to power down, aborting resume\n");
451 error = platform_pre_restore(platform_mode);
455 error = hibernate_resume_nonboot_cpu_disable();
460 system_state = SYSTEM_SUSPEND;
462 error = syscore_suspend();
466 save_processor_state();
467 error = restore_highmem();
469 error = swsusp_arch_resume();
471 * The code below is only ever reached in case of a failure.
472 * Otherwise, execution continues at the place where
473 * swsusp_arch_suspend() was called.
477 * This call to restore_highmem() reverts the changes made by
483 * The only reason why swsusp_arch_resume() can fail is memory being
484 * very tight, so we have to free it as soon as we can to avoid
485 * subsequent failures.
488 restore_processor_state();
489 touch_softlockup_watchdog();
494 system_state = SYSTEM_RUNNING;
498 enable_nonboot_cpus();
501 platform_restore_cleanup(platform_mode);
503 dpm_resume_start(PMSG_RECOVER);
509 * hibernation_restore - Quiesce devices and restore from a hibernation image.
510 * @platform_mode: If set, use platform driver to prepare for the transition.
512 * This routine must be called with system_transition_mutex held. If it is
513 * successful, control reappears in the restored target kernel in
514 * hibernation_snapshot().
516 int hibernation_restore(int platform_mode)
520 pm_prepare_console();
522 pm_restrict_gfp_mask();
523 error = dpm_suspend_start(PMSG_QUIESCE);
525 error = resume_target_kernel(platform_mode);
527 * The above should either succeed and jump to the new kernel,
528 * or return with an error. Otherwise things are just
529 * undefined, so let's be paranoid.
533 dpm_resume_end(PMSG_RECOVER);
534 pm_restore_gfp_mask();
536 pm_restore_console();
541 * hibernation_platform_enter - Power off the system using the platform driver.
543 int hibernation_platform_enter(void)
547 if (!hibernation_ops)
551 * We have cancelled the power transition by running
552 * hibernation_ops->finish() before saving the image, so we should let
553 * the firmware know that we're going to enter the sleep state after all
555 error = hibernation_ops->begin();
559 entering_platform_hibernation = true;
561 error = dpm_suspend_start(PMSG_HIBERNATE);
563 if (hibernation_ops->recover)
564 hibernation_ops->recover();
568 error = dpm_suspend_end(PMSG_HIBERNATE);
572 error = hibernation_ops->prepare();
574 goto Platform_finish;
576 error = disable_nonboot_cpus();
581 system_state = SYSTEM_SUSPEND;
583 if (pm_wakeup_pending()) {
588 hibernation_ops->enter();
589 /* We should never get here */
594 system_state = SYSTEM_RUNNING;
598 enable_nonboot_cpus();
601 hibernation_ops->finish();
603 dpm_resume_start(PMSG_RESTORE);
606 entering_platform_hibernation = false;
607 dpm_resume_end(PMSG_RESTORE);
611 hibernation_ops->end();
617 * power_down - Shut the machine down for hibernation.
619 * Use the platform driver, if configured, to put the system into the sleep
620 * state corresponding to hibernation, or try to power it off or reboot,
621 * depending on the value of hibernation_mode.
623 static void power_down(void)
625 #ifdef CONFIG_SUSPEND
628 if (hibernation_mode == HIBERNATION_SUSPEND) {
629 error = suspend_devices_and_enter(PM_SUSPEND_MEM);
631 hibernation_mode = hibernation_ops ?
632 HIBERNATION_PLATFORM :
633 HIBERNATION_SHUTDOWN;
635 /* Restore swap signature. */
636 error = swsusp_unmark();
638 pr_err("Swap will be unusable! Try swapon -a.\n");
645 switch (hibernation_mode) {
646 case HIBERNATION_REBOOT:
647 kernel_restart(NULL);
649 case HIBERNATION_PLATFORM:
650 hibernation_platform_enter();
652 case HIBERNATION_SHUTDOWN:
659 * Valid image is on the disk, if we continue we risk serious data
660 * corruption after resume.
662 pr_crit("Power down manually\n");
667 static int load_image_and_restore(void)
672 pm_pr_dbg("Loading hibernation image.\n");
674 lock_device_hotplug();
675 error = create_basic_memory_bitmaps();
679 error = swsusp_read(&flags);
680 swsusp_close(FMODE_READ | FMODE_EXCL);
682 hibernation_restore(flags & SF_PLATFORM_MODE);
684 pr_err("Failed to load hibernation image, recovering.\n");
686 free_basic_memory_bitmaps();
688 unlock_device_hotplug();
694 * hibernate - Carry out system hibernation, including saving the image.
698 int error, nr_calls = 0;
699 bool snapshot_test = false;
701 if (!hibernation_available()) {
702 pm_pr_dbg("Hibernation not available.\n");
707 /* The snapshot device should not be opened while we're running */
708 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
713 pr_info("hibernation entry\n");
714 pm_prepare_console();
715 error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
721 pr_info("Syncing filesystems ... \n");
725 error = freeze_processes();
729 lock_device_hotplug();
730 /* Allocate memory management structures */
731 error = create_basic_memory_bitmaps();
735 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
736 if (error || freezer_test_done)
740 unsigned int flags = 0;
742 if (hibernation_mode == HIBERNATION_PLATFORM)
743 flags |= SF_PLATFORM_MODE;
745 flags |= SF_NOCOMPRESS_MODE;
747 flags |= SF_CRC32_MODE;
749 pm_pr_dbg("Writing image.\n");
750 error = swsusp_write(flags);
753 if (hibernation_mode == HIBERNATION_TEST_RESUME)
754 snapshot_test = true;
759 pm_restore_gfp_mask();
761 pm_pr_dbg("Image restored successfully.\n");
765 free_basic_memory_bitmaps();
767 unlock_device_hotplug();
769 pm_pr_dbg("Checking hibernation image\n");
770 error = swsusp_check();
772 error = load_image_and_restore();
776 /* Don't bother checking whether freezer_test_done is true */
777 freezer_test_done = false;
779 __pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL);
780 pm_restore_console();
781 atomic_inc(&snapshot_device_available);
783 unlock_system_sleep();
784 pr_info("hibernation exit\n");
791 * software_resume - Resume from a saved hibernation image.
793 * This routine is called as a late initcall, when all devices have been
794 * discovered and initialized already.
796 * The image reading code is called to see if there is a hibernation image
797 * available for reading. If that is the case, devices are quiesced and the
798 * contents of memory is restored from the saved image.
800 * If this is successful, control reappears in the restored target kernel in
801 * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
802 * attempts to recover gracefully and make the kernel return to the normal mode
805 static int software_resume(void)
807 int error, nr_calls = 0;
810 * If the user said "noresume".. bail out early.
812 if (noresume || !hibernation_available())
816 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
817 * is configured into the kernel. Since the regular hibernate
818 * trigger path is via sysfs which takes a buffer mutex before
819 * calling hibernate functions (which take system_transition_mutex)
820 * this can cause lockdep to complain about a possible ABBA deadlock
821 * which cannot happen since we're in the boot code here and
822 * sysfs can't be invoked yet. Therefore, we use a subclass
823 * here to avoid lockdep complaining.
825 mutex_lock_nested(&system_transition_mutex, SINGLE_DEPTH_NESTING);
827 if (swsusp_resume_device)
830 if (!strlen(resume_file)) {
835 pm_pr_dbg("Checking hibernation image partition %s\n", resume_file);
838 pr_info("Waiting %dsec before reading resume device ...\n",
840 ssleep(resume_delay);
843 /* Check if the device is there */
844 swsusp_resume_device = name_to_dev_t(resume_file);
845 if (!swsusp_resume_device) {
847 * Some device discovery might still be in progress; we need
848 * to wait for this to finish.
850 wait_for_device_probe();
853 while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
855 async_synchronize_full();
858 swsusp_resume_device = name_to_dev_t(resume_file);
859 if (!swsusp_resume_device) {
866 pm_pr_dbg("Hibernation image partition %d:%d present\n",
867 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
869 pm_pr_dbg("Looking for hibernation image.\n");
870 error = swsusp_check();
874 /* The snapshot device should not be opened while we're running */
875 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
877 swsusp_close(FMODE_READ | FMODE_EXCL);
881 pr_info("resume from hibernation\n");
882 pm_prepare_console();
883 error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls);
889 pm_pr_dbg("Preparing processes for restore.\n");
890 error = freeze_processes();
894 error = freeze_kernel_threads();
900 error = load_image_and_restore();
903 __pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
904 pm_restore_console();
905 pr_info("resume from hibernation failed (%d)\n", error);
906 atomic_inc(&snapshot_device_available);
907 /* For success case, the suspend path will release the lock */
909 mutex_unlock(&system_transition_mutex);
910 pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
913 swsusp_close(FMODE_READ | FMODE_EXCL);
917 late_initcall_sync(software_resume);
920 static const char * const hibernation_modes[] = {
921 [HIBERNATION_PLATFORM] = "platform",
922 [HIBERNATION_SHUTDOWN] = "shutdown",
923 [HIBERNATION_REBOOT] = "reboot",
924 #ifdef CONFIG_SUSPEND
925 [HIBERNATION_SUSPEND] = "suspend",
927 [HIBERNATION_TEST_RESUME] = "test_resume",
931 * /sys/power/disk - Control hibernation mode.
933 * Hibernation can be handled in several ways. There are a few different ways
934 * to put the system into the sleep state: using the platform driver (e.g. ACPI
935 * or other hibernation_ops), powering it off or rebooting it (for testing
938 * The sysfs file /sys/power/disk provides an interface for selecting the
939 * hibernation mode to use. Reading from this file causes the available modes
940 * to be printed. There are 3 modes that can be supported:
946 * If a platform hibernation driver is in use, 'platform' will be supported
947 * and will be used by default. Otherwise, 'shutdown' will be used by default.
948 * The selected option (i.e. the one corresponding to the current value of
949 * hibernation_mode) is enclosed by a square bracket.
951 * To select a given hibernation mode it is necessary to write the mode's
952 * string representation (as returned by reading from /sys/power/disk) back
953 * into /sys/power/disk.
956 static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
962 if (!hibernation_available())
963 return sprintf(buf, "[disabled]\n");
965 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
966 if (!hibernation_modes[i])
969 case HIBERNATION_SHUTDOWN:
970 case HIBERNATION_REBOOT:
971 #ifdef CONFIG_SUSPEND
972 case HIBERNATION_SUSPEND:
974 case HIBERNATION_TEST_RESUME:
976 case HIBERNATION_PLATFORM:
979 /* not a valid mode, continue with loop */
982 if (i == hibernation_mode)
983 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
985 buf += sprintf(buf, "%s ", hibernation_modes[i]);
987 buf += sprintf(buf, "\n");
991 static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
992 const char *buf, size_t n)
998 int mode = HIBERNATION_INVALID;
1000 if (!hibernation_available())
1003 p = memchr(buf, '\n', n);
1004 len = p ? p - buf : n;
1006 lock_system_sleep();
1007 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1008 if (len == strlen(hibernation_modes[i])
1009 && !strncmp(buf, hibernation_modes[i], len)) {
1014 if (mode != HIBERNATION_INVALID) {
1016 case HIBERNATION_SHUTDOWN:
1017 case HIBERNATION_REBOOT:
1018 #ifdef CONFIG_SUSPEND
1019 case HIBERNATION_SUSPEND:
1021 case HIBERNATION_TEST_RESUME:
1022 hibernation_mode = mode;
1024 case HIBERNATION_PLATFORM:
1025 if (hibernation_ops)
1026 hibernation_mode = mode;
1034 pm_pr_dbg("Hibernation mode set to '%s'\n",
1035 hibernation_modes[mode]);
1036 unlock_system_sleep();
1037 return error ? error : n;
1042 static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
1045 return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
1046 MINOR(swsusp_resume_device));
1049 static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
1050 const char *buf, size_t n)
1056 if (len && buf[len-1] == '\n')
1058 name = kstrndup(buf, len, GFP_KERNEL);
1062 res = name_to_dev_t(name);
1067 lock_system_sleep();
1068 swsusp_resume_device = res;
1069 unlock_system_sleep();
1070 pm_pr_dbg("Configured resume from disk to %u\n", swsusp_resume_device);
1078 static ssize_t resume_offset_show(struct kobject *kobj,
1079 struct kobj_attribute *attr, char *buf)
1081 return sprintf(buf, "%llu\n", (unsigned long long)swsusp_resume_block);
1084 static ssize_t resume_offset_store(struct kobject *kobj,
1085 struct kobj_attribute *attr, const char *buf,
1088 unsigned long long offset;
1091 rc = kstrtoull(buf, 0, &offset);
1094 swsusp_resume_block = offset;
1099 power_attr(resume_offset);
1101 static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
1104 return sprintf(buf, "%lu\n", image_size);
1107 static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
1108 const char *buf, size_t n)
1112 if (sscanf(buf, "%lu", &size) == 1) {
1120 power_attr(image_size);
1122 static ssize_t reserved_size_show(struct kobject *kobj,
1123 struct kobj_attribute *attr, char *buf)
1125 return sprintf(buf, "%lu\n", reserved_size);
1128 static ssize_t reserved_size_store(struct kobject *kobj,
1129 struct kobj_attribute *attr,
1130 const char *buf, size_t n)
1134 if (sscanf(buf, "%lu", &size) == 1) {
1135 reserved_size = size;
1142 power_attr(reserved_size);
1144 static struct attribute * g[] = {
1146 &resume_offset_attr.attr,
1148 &image_size_attr.attr,
1149 &reserved_size_attr.attr,
1154 static const struct attribute_group attr_group = {
1159 static int __init pm_disk_init(void)
1161 return sysfs_create_group(power_kobj, &attr_group);
1164 core_initcall(pm_disk_init);
1167 static int __init resume_setup(char *str)
1172 strncpy( resume_file, str, 255 );
1176 static int __init resume_offset_setup(char *str)
1178 unsigned long long offset;
1183 if (sscanf(str, "%llu", &offset) == 1)
1184 swsusp_resume_block = offset;
1189 static int __init hibernate_setup(char *str)
1191 if (!strncmp(str, "noresume", 8)) {
1193 } else if (!strncmp(str, "nocompress", 10)) {
1195 } else if (!strncmp(str, "no", 2)) {
1198 } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)
1199 && !strncmp(str, "protect_image", 13)) {
1200 enable_restore_image_protection();
1205 static int __init noresume_setup(char *str)
1211 static int __init resumewait_setup(char *str)
1217 static int __init resumedelay_setup(char *str)
1219 int rc = kstrtouint(str, 0, &resume_delay);
1222 pr_warn("resumedelay: bad option string '%s'\n", str);
1226 static int __init nohibernate_setup(char *str)
1233 __setup("noresume", noresume_setup);
1234 __setup("resume_offset=", resume_offset_setup);
1235 __setup("resume=", resume_setup);
1236 __setup("hibernate=", hibernate_setup);
1237 __setup("resumewait", resumewait_setup);
1238 __setup("resumedelay=", resumedelay_setup);
1239 __setup("nohibernate", nohibernate_setup);