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/console.h>
27 #include <linux/cpu.h>
28 #include <linux/freezer.h>
29 #include <linux/gfp.h>
30 #include <linux/syscore_ops.h>
31 #include <linux/ctype.h>
32 #include <linux/genhd.h>
33 #include <linux/ktime.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);
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("hibernation 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() : 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,
261 * create_image - Create a hibernation image.
262 * @platform_mode: Whether or not to use the platform driver.
264 * Execute device drivers' "late" and "noirq" freeze callbacks, create a
265 * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
267 * Control reappears in this routine after the subsequent restore.
269 static int create_image(int platform_mode)
273 error = dpm_suspend_end(PMSG_FREEZE);
275 pr_err("Some devices failed to power down, aborting hibernation\n");
279 error = platform_pre_snapshot(platform_mode);
280 if (error || hibernation_test(TEST_PLATFORM))
281 goto Platform_finish;
283 error = disable_nonboot_cpus();
284 if (error || hibernation_test(TEST_CPUS))
289 error = syscore_suspend();
291 pr_err("Some system devices failed to power down, aborting hibernation\n");
295 if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
299 save_processor_state();
300 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
301 error = swsusp_arch_suspend();
302 /* Restore control flow magically appears here */
303 restore_processor_state();
304 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
306 pr_err("Error %d creating hibernation image\n", error);
309 events_check_enabled = false;
313 platform_leave(platform_mode);
322 enable_nonboot_cpus();
325 platform_finish(platform_mode);
327 dpm_resume_start(in_suspend ?
328 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
334 * hibernation_snapshot - Quiesce devices and create a hibernation image.
335 * @platform_mode: If set, use platform driver to prepare for the transition.
337 * This routine must be called with pm_mutex held.
339 int hibernation_snapshot(int platform_mode)
344 pm_suspend_clear_flags();
345 error = platform_begin(platform_mode);
349 /* Preallocate image memory before shutting down devices. */
350 error = hibernate_preallocate_memory();
354 error = freeze_kernel_threads();
358 if (hibernation_test(TEST_FREEZER)) {
361 * Indicate to the caller that we are returning due to a
362 * successful freezer test.
364 freezer_test_done = true;
368 error = dpm_prepare(PMSG_FREEZE);
370 dpm_complete(PMSG_RECOVER);
375 pm_restrict_gfp_mask();
377 error = dpm_suspend(PMSG_FREEZE);
379 if (error || hibernation_test(TEST_DEVICES))
380 platform_recover(platform_mode);
382 error = create_image(platform_mode);
385 * In the case that we call create_image() above, the control
386 * returns here (1) after the image has been created or the
387 * image creation has failed and (2) after a successful restore.
390 /* We may need to release the preallocated image pages here. */
391 if (error || !in_suspend)
394 msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE;
397 if (error || !in_suspend)
398 pm_restore_gfp_mask();
404 platform_end(platform_mode);
408 thaw_kernel_threads();
414 int __weak hibernate_resume_nonboot_cpu_disable(void)
416 return disable_nonboot_cpus();
420 * resume_target_kernel - Restore system state from a hibernation image.
421 * @platform_mode: Whether or not to use the platform driver.
423 * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
424 * contents of highmem that have not been restored yet from the image and run
425 * the low-level code that will restore the remaining contents of memory and
426 * switch to the just restored target kernel.
428 static int resume_target_kernel(bool platform_mode)
432 error = dpm_suspend_end(PMSG_QUIESCE);
434 pr_err("Some devices failed to power down, aborting resume\n");
438 error = platform_pre_restore(platform_mode);
442 error = hibernate_resume_nonboot_cpu_disable();
448 error = syscore_suspend();
452 save_processor_state();
453 error = restore_highmem();
455 error = swsusp_arch_resume();
457 * The code below is only ever reached in case of a failure.
458 * Otherwise, execution continues at the place where
459 * swsusp_arch_suspend() was called.
463 * This call to restore_highmem() reverts the changes made by
469 * The only reason why swsusp_arch_resume() can fail is memory being
470 * very tight, so we have to free it as soon as we can to avoid
471 * subsequent failures.
474 restore_processor_state();
475 touch_softlockup_watchdog();
483 enable_nonboot_cpus();
486 platform_restore_cleanup(platform_mode);
488 dpm_resume_start(PMSG_RECOVER);
494 * hibernation_restore - Quiesce devices and restore from a hibernation image.
495 * @platform_mode: If set, use platform driver to prepare for the transition.
497 * This routine must be called with pm_mutex held. If it is successful, control
498 * reappears in the restored target kernel in hibernation_snapshot().
500 int hibernation_restore(int platform_mode)
504 pm_prepare_console();
506 pm_restrict_gfp_mask();
507 error = dpm_suspend_start(PMSG_QUIESCE);
509 error = resume_target_kernel(platform_mode);
511 * The above should either succeed and jump to the new kernel,
512 * or return with an error. Otherwise things are just
513 * undefined, so let's be paranoid.
517 dpm_resume_end(PMSG_RECOVER);
518 pm_restore_gfp_mask();
520 pm_restore_console();
525 * hibernation_platform_enter - Power off the system using the platform driver.
527 int hibernation_platform_enter(void)
531 if (!hibernation_ops)
535 * We have cancelled the power transition by running
536 * hibernation_ops->finish() before saving the image, so we should let
537 * the firmware know that we're going to enter the sleep state after all
539 error = hibernation_ops->begin();
543 entering_platform_hibernation = true;
545 error = dpm_suspend_start(PMSG_HIBERNATE);
547 if (hibernation_ops->recover)
548 hibernation_ops->recover();
552 error = dpm_suspend_end(PMSG_HIBERNATE);
556 error = hibernation_ops->prepare();
558 goto Platform_finish;
560 error = disable_nonboot_cpus();
566 if (pm_wakeup_pending()) {
571 hibernation_ops->enter();
572 /* We should never get here */
580 enable_nonboot_cpus();
583 hibernation_ops->finish();
585 dpm_resume_start(PMSG_RESTORE);
588 entering_platform_hibernation = false;
589 dpm_resume_end(PMSG_RESTORE);
593 hibernation_ops->end();
599 * power_down - Shut the machine down for hibernation.
601 * Use the platform driver, if configured, to put the system into the sleep
602 * state corresponding to hibernation, or try to power it off or reboot,
603 * depending on the value of hibernation_mode.
605 static void power_down(void)
607 #ifdef CONFIG_SUSPEND
610 if (hibernation_mode == HIBERNATION_SUSPEND) {
611 error = suspend_devices_and_enter(PM_SUSPEND_MEM);
613 hibernation_mode = hibernation_ops ?
614 HIBERNATION_PLATFORM :
615 HIBERNATION_SHUTDOWN;
617 /* Restore swap signature. */
618 error = swsusp_unmark();
620 pr_err("Swap will be unusable! Try swapon -a.\n");
627 switch (hibernation_mode) {
628 case HIBERNATION_REBOOT:
629 kernel_restart(NULL);
631 case HIBERNATION_PLATFORM:
632 hibernation_platform_enter();
633 case HIBERNATION_SHUTDOWN:
640 * Valid image is on the disk, if we continue we risk serious data
641 * corruption after resume.
643 pr_crit("Power down manually\n");
648 static int load_image_and_restore(void)
653 pr_debug("Loading hibernation image.\n");
655 lock_device_hotplug();
656 error = create_basic_memory_bitmaps();
660 error = swsusp_read(&flags);
661 swsusp_close(FMODE_READ);
663 hibernation_restore(flags & SF_PLATFORM_MODE);
665 pr_err("Failed to load hibernation image, recovering.\n");
667 free_basic_memory_bitmaps();
669 unlock_device_hotplug();
675 * hibernate - Carry out system hibernation, including saving the image.
679 int error, nr_calls = 0;
680 bool snapshot_test = false;
682 if (!hibernation_available()) {
683 pr_debug("Hibernation not available.\n");
688 /* The snapshot device should not be opened while we're running */
689 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
694 pm_prepare_console();
695 error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
701 pr_info("Syncing filesystems ... \n");
705 error = freeze_processes();
709 lock_device_hotplug();
710 /* Allocate memory management structures */
711 error = create_basic_memory_bitmaps();
715 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
716 if (error || freezer_test_done)
720 unsigned int flags = 0;
722 if (hibernation_mode == HIBERNATION_PLATFORM)
723 flags |= SF_PLATFORM_MODE;
725 flags |= SF_NOCOMPRESS_MODE;
727 flags |= SF_CRC32_MODE;
729 pr_debug("Writing image.\n");
730 error = swsusp_write(flags);
733 if (hibernation_mode == HIBERNATION_TEST_RESUME)
734 snapshot_test = true;
739 pm_restore_gfp_mask();
741 pr_debug("Image restored successfully.\n");
745 free_basic_memory_bitmaps();
747 unlock_device_hotplug();
749 pr_debug("Checking hibernation image\n");
750 error = swsusp_check();
752 error = load_image_and_restore();
756 /* Don't bother checking whether freezer_test_done is true */
757 freezer_test_done = false;
759 __pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL);
760 pm_restore_console();
761 atomic_inc(&snapshot_device_available);
763 unlock_system_sleep();
769 * software_resume - Resume from a saved hibernation image.
771 * This routine is called as a late initcall, when all devices have been
772 * discovered and initialized already.
774 * The image reading code is called to see if there is a hibernation image
775 * available for reading. If that is the case, devices are quiesced and the
776 * contents of memory is restored from the saved image.
778 * If this is successful, control reappears in the restored target kernel in
779 * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
780 * attempts to recover gracefully and make the kernel return to the normal mode
783 static int software_resume(void)
785 int error, nr_calls = 0;
788 * If the user said "noresume".. bail out early.
790 if (noresume || !hibernation_available())
794 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
795 * is configured into the kernel. Since the regular hibernate
796 * trigger path is via sysfs which takes a buffer mutex before
797 * calling hibernate functions (which take pm_mutex) this can
798 * cause lockdep to complain about a possible ABBA deadlock
799 * which cannot happen since we're in the boot code here and
800 * sysfs can't be invoked yet. Therefore, we use a subclass
801 * here to avoid lockdep complaining.
803 mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING);
805 if (swsusp_resume_device)
808 if (!strlen(resume_file)) {
813 pr_debug("Checking hibernation image partition %s\n", resume_file);
816 pr_info("Waiting %dsec before reading resume device ...\n",
818 ssleep(resume_delay);
821 /* Check if the device is there */
822 swsusp_resume_device = name_to_dev_t(resume_file);
825 * name_to_dev_t is ineffective to verify parition if resume_file is in
826 * integer format. (e.g. major:minor)
828 if (isdigit(resume_file[0]) && resume_wait) {
830 while (!get_gendisk(swsusp_resume_device, &partno))
834 if (!swsusp_resume_device) {
836 * Some device discovery might still be in progress; we need
837 * to wait for this to finish.
839 wait_for_device_probe();
842 while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
844 async_synchronize_full();
847 swsusp_resume_device = name_to_dev_t(resume_file);
848 if (!swsusp_resume_device) {
855 pr_debug("Hibernation image partition %d:%d present\n",
856 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
858 pr_debug("Looking for hibernation image.\n");
859 error = swsusp_check();
863 /* The snapshot device should not be opened while we're running */
864 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
866 swsusp_close(FMODE_READ);
870 pm_prepare_console();
871 error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls);
877 pr_debug("Preparing processes for restore.\n");
878 error = freeze_processes();
881 error = load_image_and_restore();
884 __pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
885 pm_restore_console();
886 atomic_inc(&snapshot_device_available);
887 /* For success case, the suspend path will release the lock */
889 mutex_unlock(&pm_mutex);
890 pr_debug("Hibernation image not present or could not be loaded.\n");
893 swsusp_close(FMODE_READ);
897 late_initcall_sync(software_resume);
900 static const char * const hibernation_modes[] = {
901 [HIBERNATION_PLATFORM] = "platform",
902 [HIBERNATION_SHUTDOWN] = "shutdown",
903 [HIBERNATION_REBOOT] = "reboot",
904 #ifdef CONFIG_SUSPEND
905 [HIBERNATION_SUSPEND] = "suspend",
907 [HIBERNATION_TEST_RESUME] = "test_resume",
911 * /sys/power/disk - Control hibernation mode.
913 * Hibernation can be handled in several ways. There are a few different ways
914 * to put the system into the sleep state: using the platform driver (e.g. ACPI
915 * or other hibernation_ops), powering it off or rebooting it (for testing
918 * The sysfs file /sys/power/disk provides an interface for selecting the
919 * hibernation mode to use. Reading from this file causes the available modes
920 * to be printed. There are 3 modes that can be supported:
926 * If a platform hibernation driver is in use, 'platform' will be supported
927 * and will be used by default. Otherwise, 'shutdown' will be used by default.
928 * The selected option (i.e. the one corresponding to the current value of
929 * hibernation_mode) is enclosed by a square bracket.
931 * To select a given hibernation mode it is necessary to write the mode's
932 * string representation (as returned by reading from /sys/power/disk) back
933 * into /sys/power/disk.
936 static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
942 if (!hibernation_available())
943 return sprintf(buf, "[disabled]\n");
945 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
946 if (!hibernation_modes[i])
949 case HIBERNATION_SHUTDOWN:
950 case HIBERNATION_REBOOT:
951 #ifdef CONFIG_SUSPEND
952 case HIBERNATION_SUSPEND:
954 case HIBERNATION_TEST_RESUME:
956 case HIBERNATION_PLATFORM:
959 /* not a valid mode, continue with loop */
962 if (i == hibernation_mode)
963 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
965 buf += sprintf(buf, "%s ", hibernation_modes[i]);
967 buf += sprintf(buf, "\n");
971 static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
972 const char *buf, size_t n)
978 int mode = HIBERNATION_INVALID;
980 if (!hibernation_available())
983 p = memchr(buf, '\n', n);
984 len = p ? p - buf : n;
987 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
988 if (len == strlen(hibernation_modes[i])
989 && !strncmp(buf, hibernation_modes[i], len)) {
994 if (mode != HIBERNATION_INVALID) {
996 case HIBERNATION_SHUTDOWN:
997 case HIBERNATION_REBOOT:
998 #ifdef CONFIG_SUSPEND
999 case HIBERNATION_SUSPEND:
1001 case HIBERNATION_TEST_RESUME:
1002 hibernation_mode = mode;
1004 case HIBERNATION_PLATFORM:
1005 if (hibernation_ops)
1006 hibernation_mode = mode;
1014 pr_debug("Hibernation mode set to '%s'\n",
1015 hibernation_modes[mode]);
1016 unlock_system_sleep();
1017 return error ? error : n;
1022 static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
1025 return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
1026 MINOR(swsusp_resume_device));
1029 static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
1030 const char *buf, size_t n)
1036 if (len && buf[len-1] == '\n')
1038 name = kstrndup(buf, len, GFP_KERNEL);
1042 res = name_to_dev_t(name);
1047 lock_system_sleep();
1048 swsusp_resume_device = res;
1049 unlock_system_sleep();
1050 pr_info("Starting manual resume from disk\n");
1058 static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
1061 return sprintf(buf, "%lu\n", image_size);
1064 static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
1065 const char *buf, size_t n)
1069 if (sscanf(buf, "%lu", &size) == 1) {
1077 power_attr(image_size);
1079 static ssize_t reserved_size_show(struct kobject *kobj,
1080 struct kobj_attribute *attr, char *buf)
1082 return sprintf(buf, "%lu\n", reserved_size);
1085 static ssize_t reserved_size_store(struct kobject *kobj,
1086 struct kobj_attribute *attr,
1087 const char *buf, size_t n)
1091 if (sscanf(buf, "%lu", &size) == 1) {
1092 reserved_size = size;
1099 power_attr(reserved_size);
1101 static struct attribute * g[] = {
1104 &image_size_attr.attr,
1105 &reserved_size_attr.attr,
1110 static struct attribute_group attr_group = {
1115 static int __init pm_disk_init(void)
1117 return sysfs_create_group(power_kobj, &attr_group);
1120 core_initcall(pm_disk_init);
1123 static int __init resume_setup(char *str)
1128 strncpy( resume_file, str, 255 );
1132 static int __init resume_offset_setup(char *str)
1134 unsigned long long offset;
1139 if (sscanf(str, "%llu", &offset) == 1)
1140 swsusp_resume_block = offset;
1145 static int __init hibernate_setup(char *str)
1147 if (!strncmp(str, "noresume", 8)) {
1149 } else if (!strncmp(str, "nocompress", 10)) {
1151 } else if (!strncmp(str, "no", 2)) {
1154 } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)
1155 && !strncmp(str, "protect_image", 13)) {
1156 enable_restore_image_protection();
1161 static int __init noresume_setup(char *str)
1167 static int __init resumewait_setup(char *str)
1173 static int __init resumedelay_setup(char *str)
1175 int rc = kstrtouint(str, 0, &resume_delay);
1182 static int __init nohibernate_setup(char *str)
1189 __setup("noresume", noresume_setup);
1190 __setup("resume_offset=", resume_offset_setup);
1191 __setup("resume=", resume_setup);
1192 __setup("hibernate=", hibernate_setup);
1193 __setup("resumewait", resumewait_setup);
1194 __setup("resumedelay=", resumedelay_setup);
1195 __setup("nohibernate", nohibernate_setup);