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;
56 __HIBERNATION_AFTER_LAST
58 #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
59 #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
61 static int hibernation_mode = HIBERNATION_SHUTDOWN;
63 bool freezer_test_done;
65 static const struct platform_hibernation_ops *hibernation_ops;
67 bool hibernation_available(void)
69 return (nohibernate == 0);
73 * hibernation_set_ops - Set the global hibernate operations.
74 * @ops: Hibernation operations to use in subsequent hibernation transitions.
76 void hibernation_set_ops(const struct platform_hibernation_ops *ops)
78 if (ops && !(ops->begin && ops->end && ops->pre_snapshot
79 && ops->prepare && ops->finish && ops->enter && ops->pre_restore
80 && ops->restore_cleanup && ops->leave)) {
85 hibernation_ops = ops;
87 hibernation_mode = HIBERNATION_PLATFORM;
88 else if (hibernation_mode == HIBERNATION_PLATFORM)
89 hibernation_mode = HIBERNATION_SHUTDOWN;
91 unlock_system_sleep();
93 EXPORT_SYMBOL_GPL(hibernation_set_ops);
95 static bool entering_platform_hibernation;
97 bool system_entering_hibernation(void)
99 return entering_platform_hibernation;
101 EXPORT_SYMBOL(system_entering_hibernation);
103 #ifdef CONFIG_PM_DEBUG
104 static void hibernation_debug_sleep(void)
106 printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n");
110 static int hibernation_test(int level)
112 if (pm_test_level == level) {
113 hibernation_debug_sleep();
118 #else /* !CONFIG_PM_DEBUG */
119 static int hibernation_test(int level) { return 0; }
120 #endif /* !CONFIG_PM_DEBUG */
123 * platform_begin - Call platform to start hibernation.
124 * @platform_mode: Whether or not to use the platform driver.
126 static int platform_begin(int platform_mode)
128 return (platform_mode && hibernation_ops) ?
129 hibernation_ops->begin() : 0;
133 * platform_end - Call platform to finish transition to the working state.
134 * @platform_mode: Whether or not to use the platform driver.
136 static void platform_end(int platform_mode)
138 if (platform_mode && hibernation_ops)
139 hibernation_ops->end();
143 * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
144 * @platform_mode: Whether or not to use the platform driver.
146 * Use the platform driver to prepare the system for creating a hibernate image,
147 * if so configured, and return an error code if that fails.
150 static int platform_pre_snapshot(int platform_mode)
152 return (platform_mode && hibernation_ops) ?
153 hibernation_ops->pre_snapshot() : 0;
157 * platform_leave - Call platform to prepare a transition to the working state.
158 * @platform_mode: Whether or not to use the platform driver.
160 * Use the platform driver prepare to prepare the machine for switching to the
161 * normal mode of operation.
163 * This routine is called on one CPU with interrupts disabled.
165 static void platform_leave(int platform_mode)
167 if (platform_mode && hibernation_ops)
168 hibernation_ops->leave();
172 * platform_finish - Call platform to switch the system to the working state.
173 * @platform_mode: Whether or not to use the platform driver.
175 * Use the platform driver to switch the machine to the normal mode of
178 * This routine must be called after platform_prepare().
180 static void platform_finish(int platform_mode)
182 if (platform_mode && hibernation_ops)
183 hibernation_ops->finish();
187 * platform_pre_restore - Prepare for hibernate image restoration.
188 * @platform_mode: Whether or not to use the platform driver.
190 * Use the platform driver to prepare the system for resume from a hibernation
193 * If the restore fails after this function has been called,
194 * platform_restore_cleanup() must be called.
196 static int platform_pre_restore(int platform_mode)
198 return (platform_mode && hibernation_ops) ?
199 hibernation_ops->pre_restore() : 0;
203 * platform_restore_cleanup - Switch to the working state after failing restore.
204 * @platform_mode: Whether or not to use the platform driver.
206 * Use the platform driver to switch the system to the normal mode of operation
207 * after a failing restore.
209 * If platform_pre_restore() has been called before the failing restore, this
210 * function must be called too, regardless of the result of
211 * platform_pre_restore().
213 static void platform_restore_cleanup(int platform_mode)
215 if (platform_mode && hibernation_ops)
216 hibernation_ops->restore_cleanup();
220 * platform_recover - Recover from a failure to suspend devices.
221 * @platform_mode: Whether or not to use the platform driver.
223 static void platform_recover(int platform_mode)
225 if (platform_mode && hibernation_ops && hibernation_ops->recover)
226 hibernation_ops->recover();
230 * swsusp_show_speed - Print time elapsed between two events during hibernation.
231 * @start: Starting event.
232 * @stop: Final event.
233 * @nr_pages: Number of memory pages processed between @start and @stop.
234 * @msg: Additional diagnostic message to print.
236 void swsusp_show_speed(ktime_t start, ktime_t stop,
237 unsigned nr_pages, char *msg)
240 u64 elapsed_centisecs64;
241 unsigned int centisecs;
245 diff = ktime_sub(stop, start);
246 elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC);
247 centisecs = elapsed_centisecs64;
249 centisecs = 1; /* avoid div-by-zero */
250 k = nr_pages * (PAGE_SIZE / 1024);
251 kps = (k * 100) / centisecs;
252 printk(KERN_INFO "PM: %s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n",
254 centisecs / 100, centisecs % 100,
255 kps / 1000, (kps % 1000) / 10);
259 * create_image - Create a hibernation image.
260 * @platform_mode: Whether or not to use the platform driver.
262 * Execute device drivers' "late" and "noirq" freeze callbacks, create a
263 * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
265 * Control reappears in this routine after the subsequent restore.
267 static int create_image(int platform_mode)
271 error = dpm_suspend_end(PMSG_FREEZE);
273 printk(KERN_ERR "PM: Some devices failed to power down, "
274 "aborting hibernation\n");
278 error = platform_pre_snapshot(platform_mode);
279 if (error || hibernation_test(TEST_PLATFORM))
280 goto Platform_finish;
282 error = disable_nonboot_cpus();
283 if (error || hibernation_test(TEST_CPUS))
288 system_state = SYSTEM_SUSPEND;
290 error = syscore_suspend();
292 printk(KERN_ERR "PM: Some system devices failed to power down, "
293 "aborting hibernation\n");
297 if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
301 save_processor_state();
302 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
303 error = swsusp_arch_suspend();
304 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
306 printk(KERN_ERR "PM: Error %d creating hibernation image\n",
308 /* Restore control flow magically appears here */
309 restore_processor_state();
311 events_check_enabled = false;
313 platform_leave(platform_mode);
319 system_state = SYSTEM_RUNNING;
323 enable_nonboot_cpus();
326 platform_finish(platform_mode);
328 dpm_resume_start(in_suspend ?
329 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
335 * hibernation_snapshot - Quiesce devices and create a hibernation image.
336 * @platform_mode: If set, use platform driver to prepare for the transition.
338 * This routine must be called with pm_mutex held.
340 int hibernation_snapshot(int platform_mode)
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();
415 * resume_target_kernel - Restore system state from a hibernation image.
416 * @platform_mode: Whether or not to use the platform driver.
418 * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
419 * contents of highmem that have not been restored yet from the image and run
420 * the low-level code that will restore the remaining contents of memory and
421 * switch to the just restored target kernel.
423 static int resume_target_kernel(bool platform_mode)
427 error = dpm_suspend_end(PMSG_QUIESCE);
429 printk(KERN_ERR "PM: Some devices failed to power down, "
430 "aborting resume\n");
434 error = platform_pre_restore(platform_mode);
438 error = disable_nonboot_cpus();
443 system_state = SYSTEM_SUSPEND;
445 error = syscore_suspend();
449 save_processor_state();
450 error = restore_highmem();
452 error = swsusp_arch_resume();
454 * The code below is only ever reached in case of a failure.
455 * Otherwise, execution continues at the place where
456 * swsusp_arch_suspend() was called.
460 * This call to restore_highmem() reverts the changes made by
466 * The only reason why swsusp_arch_resume() can fail is memory being
467 * very tight, so we have to free it as soon as we can to avoid
468 * subsequent failures.
471 restore_processor_state();
472 touch_softlockup_watchdog();
477 system_state = SYSTEM_RUNNING;
481 enable_nonboot_cpus();
484 platform_restore_cleanup(platform_mode);
486 dpm_resume_start(PMSG_RECOVER);
492 * hibernation_restore - Quiesce devices and restore from a hibernation image.
493 * @platform_mode: If set, use platform driver to prepare for the transition.
495 * This routine must be called with pm_mutex held. If it is successful, control
496 * reappears in the restored target kernel in hibernation_snapshot().
498 int hibernation_restore(int platform_mode)
502 pm_prepare_console();
504 pm_restrict_gfp_mask();
505 error = dpm_suspend_start(PMSG_QUIESCE);
507 error = resume_target_kernel(platform_mode);
509 * The above should either succeed and jump to the new kernel,
510 * or return with an error. Otherwise things are just
511 * undefined, so let's be paranoid.
515 dpm_resume_end(PMSG_RECOVER);
516 pm_restore_gfp_mask();
518 pm_restore_console();
523 * hibernation_platform_enter - Power off the system using the platform driver.
525 int hibernation_platform_enter(void)
529 if (!hibernation_ops)
533 * We have cancelled the power transition by running
534 * hibernation_ops->finish() before saving the image, so we should let
535 * the firmware know that we're going to enter the sleep state after all
537 error = hibernation_ops->begin();
541 entering_platform_hibernation = true;
543 error = dpm_suspend_start(PMSG_HIBERNATE);
545 if (hibernation_ops->recover)
546 hibernation_ops->recover();
550 error = dpm_suspend_end(PMSG_HIBERNATE);
554 error = hibernation_ops->prepare();
556 goto Platform_finish;
558 error = disable_nonboot_cpus();
563 system_state = SYSTEM_SUSPEND;
565 if (pm_wakeup_pending()) {
570 hibernation_ops->enter();
571 /* We should never get here */
576 system_state = SYSTEM_RUNNING;
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
611 switch (hibernation_mode) {
612 case HIBERNATION_REBOOT:
613 kernel_restart(NULL);
615 case HIBERNATION_PLATFORM:
616 hibernation_platform_enter();
617 case HIBERNATION_SHUTDOWN:
621 #ifdef CONFIG_SUSPEND
622 case HIBERNATION_SUSPEND:
623 error = suspend_devices_and_enter(PM_SUSPEND_MEM);
626 hibernation_mode = HIBERNATION_PLATFORM;
628 hibernation_mode = HIBERNATION_SHUTDOWN;
632 * Restore swap signature.
634 error = swsusp_unmark();
636 printk(KERN_ERR "PM: Swap will be unusable! "
643 * Valid image is on the disk, if we continue we risk serious data
644 * corruption after resume.
646 printk(KERN_CRIT "PM: Please power down manually\n");
651 #ifndef CONFIG_SUSPEND
656 * hibernate - Carry out system hibernation, including saving the image.
662 if (!hibernation_available()) {
663 pr_debug("PM: Hibernation not available.\n");
670 /* The snapshot device should not be opened while we're running */
671 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
676 pm_prepare_console();
677 error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
681 printk(KERN_INFO "PM: Syncing filesystems ... ");
685 error = freeze_processes();
689 lock_device_hotplug();
690 /* Allocate memory management structures */
691 error = create_basic_memory_bitmaps();
695 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
696 if (error || freezer_test_done)
700 unsigned int flags = 0;
702 if (hibernation_mode == HIBERNATION_PLATFORM)
703 flags |= SF_PLATFORM_MODE;
705 flags |= SF_NOCOMPRESS_MODE;
707 flags |= SF_CRC32_MODE;
709 pr_debug("PM: writing image.\n");
710 error = swsusp_write(flags);
715 pm_restore_gfp_mask();
717 pr_debug("PM: Image restored successfully.\n");
721 free_basic_memory_bitmaps();
723 unlock_device_hotplug();
726 /* Don't bother checking whether freezer_test_done is true */
727 freezer_test_done = false;
729 pm_notifier_call_chain(PM_POST_HIBERNATION);
730 pm_restore_console();
731 atomic_inc(&snapshot_device_available);
733 unlock_system_sleep();
734 pm_in_action = false;
740 * software_resume - Resume from a saved hibernation image.
742 * This routine is called as a late initcall, when all devices have been
743 * discovered and initialized already.
745 * The image reading code is called to see if there is a hibernation image
746 * available for reading. If that is the case, devices are quiesced and the
747 * contents of memory is restored from the saved image.
749 * If this is successful, control reappears in the restored target kernel in
750 * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
751 * attempts to recover gracefully and make the kernel return to the normal mode
754 static int software_resume(void)
760 * If the user said "noresume".. bail out early.
762 if (noresume || !hibernation_available())
766 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
767 * is configured into the kernel. Since the regular hibernate
768 * trigger path is via sysfs which takes a buffer mutex before
769 * calling hibernate functions (which take pm_mutex) this can
770 * cause lockdep to complain about a possible ABBA deadlock
771 * which cannot happen since we're in the boot code here and
772 * sysfs can't be invoked yet. Therefore, we use a subclass
773 * here to avoid lockdep complaining.
775 mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING);
777 if (swsusp_resume_device)
780 if (!strlen(resume_file)) {
785 pr_debug("PM: Checking hibernation image partition %s\n", resume_file);
788 printk(KERN_INFO "Waiting %dsec before reading resume device...\n",
790 ssleep(resume_delay);
793 /* Check if the device is there */
794 swsusp_resume_device = name_to_dev_t(resume_file);
797 * name_to_dev_t is ineffective to verify parition if resume_file is in
798 * integer format. (e.g. major:minor)
800 if (isdigit(resume_file[0]) && resume_wait) {
802 while (!get_gendisk(swsusp_resume_device, &partno))
806 if (!swsusp_resume_device) {
808 * Some device discovery might still be in progress; we need
809 * to wait for this to finish.
811 wait_for_device_probe();
814 while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
816 async_synchronize_full();
819 swsusp_resume_device = name_to_dev_t(resume_file);
820 if (!swsusp_resume_device) {
827 pr_debug("PM: Hibernation image partition %d:%d present\n",
828 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
830 pr_debug("PM: Looking for hibernation image.\n");
831 error = swsusp_check();
835 /* The snapshot device should not be opened while we're running */
836 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
838 swsusp_close(FMODE_READ);
842 pm_prepare_console();
843 error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
847 pr_debug("PM: Preparing processes for restore.\n");
848 error = freeze_processes();
852 pr_debug("PM: Loading hibernation image.\n");
854 lock_device_hotplug();
855 error = create_basic_memory_bitmaps();
859 error = swsusp_read(&flags);
860 swsusp_close(FMODE_READ);
862 hibernation_restore(flags & SF_PLATFORM_MODE);
864 printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n");
866 free_basic_memory_bitmaps();
868 unlock_device_hotplug();
871 pm_notifier_call_chain(PM_POST_RESTORE);
872 pm_restore_console();
873 atomic_inc(&snapshot_device_available);
874 /* For success case, the suspend path will release the lock */
876 mutex_unlock(&pm_mutex);
877 pr_debug("PM: Hibernation image not present or could not be loaded.\n");
880 swsusp_close(FMODE_READ);
884 late_initcall_sync(software_resume);
887 static const char * const hibernation_modes[] = {
888 [HIBERNATION_PLATFORM] = "platform",
889 [HIBERNATION_SHUTDOWN] = "shutdown",
890 [HIBERNATION_REBOOT] = "reboot",
891 #ifdef CONFIG_SUSPEND
892 [HIBERNATION_SUSPEND] = "suspend",
897 * /sys/power/disk - Control hibernation mode.
899 * Hibernation can be handled in several ways. There are a few different ways
900 * to put the system into the sleep state: using the platform driver (e.g. ACPI
901 * or other hibernation_ops), powering it off or rebooting it (for testing
904 * The sysfs file /sys/power/disk provides an interface for selecting the
905 * hibernation mode to use. Reading from this file causes the available modes
906 * to be printed. There are 3 modes that can be supported:
912 * If a platform hibernation driver is in use, 'platform' will be supported
913 * and will be used by default. Otherwise, 'shutdown' will be used by default.
914 * The selected option (i.e. the one corresponding to the current value of
915 * hibernation_mode) is enclosed by a square bracket.
917 * To select a given hibernation mode it is necessary to write the mode's
918 * string representation (as returned by reading from /sys/power/disk) back
919 * into /sys/power/disk.
922 static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
928 if (!hibernation_available())
929 return sprintf(buf, "[disabled]\n");
931 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
932 if (!hibernation_modes[i])
935 case HIBERNATION_SHUTDOWN:
936 case HIBERNATION_REBOOT:
937 #ifdef CONFIG_SUSPEND
938 case HIBERNATION_SUSPEND:
941 case HIBERNATION_PLATFORM:
944 /* not a valid mode, continue with loop */
947 if (i == hibernation_mode)
948 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
950 buf += sprintf(buf, "%s ", hibernation_modes[i]);
952 buf += sprintf(buf, "\n");
956 static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
957 const char *buf, size_t n)
963 int mode = HIBERNATION_INVALID;
965 if (!hibernation_available())
968 p = memchr(buf, '\n', n);
969 len = p ? p - buf : n;
972 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
973 if (len == strlen(hibernation_modes[i])
974 && !strncmp(buf, hibernation_modes[i], len)) {
979 if (mode != HIBERNATION_INVALID) {
981 case HIBERNATION_SHUTDOWN:
982 case HIBERNATION_REBOOT:
983 #ifdef CONFIG_SUSPEND
984 case HIBERNATION_SUSPEND:
986 hibernation_mode = mode;
988 case HIBERNATION_PLATFORM:
990 hibernation_mode = mode;
998 pr_debug("PM: Hibernation mode set to '%s'\n",
999 hibernation_modes[mode]);
1000 unlock_system_sleep();
1001 return error ? error : n;
1006 static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
1009 return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
1010 MINOR(swsusp_resume_device));
1013 static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
1014 const char *buf, size_t n)
1020 if (len && buf[len-1] == '\n')
1022 name = kstrndup(buf, len, GFP_KERNEL);
1026 res = name_to_dev_t(name);
1031 lock_system_sleep();
1032 swsusp_resume_device = res;
1033 unlock_system_sleep();
1034 printk(KERN_INFO "PM: Starting manual resume from disk\n");
1042 static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
1045 return sprintf(buf, "%lu\n", image_size);
1048 static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
1049 const char *buf, size_t n)
1053 if (sscanf(buf, "%lu", &size) == 1) {
1061 power_attr(image_size);
1063 static ssize_t reserved_size_show(struct kobject *kobj,
1064 struct kobj_attribute *attr, char *buf)
1066 return sprintf(buf, "%lu\n", reserved_size);
1069 static ssize_t reserved_size_store(struct kobject *kobj,
1070 struct kobj_attribute *attr,
1071 const char *buf, size_t n)
1075 if (sscanf(buf, "%lu", &size) == 1) {
1076 reserved_size = size;
1083 power_attr(reserved_size);
1085 static struct attribute * g[] = {
1088 &image_size_attr.attr,
1089 &reserved_size_attr.attr,
1094 static struct attribute_group attr_group = {
1099 static int __init pm_disk_init(void)
1101 return sysfs_create_group(power_kobj, &attr_group);
1104 core_initcall(pm_disk_init);
1107 static int __init resume_setup(char *str)
1112 strncpy( resume_file, str, 255 );
1116 static int __init resume_offset_setup(char *str)
1118 unsigned long long offset;
1123 if (sscanf(str, "%llu", &offset) == 1)
1124 swsusp_resume_block = offset;
1129 static int __init hibernate_setup(char *str)
1131 if (!strncmp(str, "noresume", 8))
1133 else if (!strncmp(str, "nocompress", 10))
1135 else if (!strncmp(str, "no", 2)) {
1142 static int __init noresume_setup(char *str)
1148 static int __init resumewait_setup(char *str)
1154 static int __init resumedelay_setup(char *str)
1156 int rc = kstrtouint(str, 0, &resume_delay);
1163 static int __init nohibernate_setup(char *str)
1170 static int __init kaslr_nohibernate_setup(char *str)
1172 return nohibernate_setup(str);
1175 __setup("noresume", noresume_setup);
1176 __setup("resume_offset=", resume_offset_setup);
1177 __setup("resume=", resume_setup);
1178 __setup("hibernate=", hibernate_setup);
1179 __setup("resumewait", resumewait_setup);
1180 __setup("resumedelay=", resumedelay_setup);
1181 __setup("nohibernate", nohibernate_setup);
1182 __setup("kaslr", kaslr_nohibernate_setup);