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 <linux/module.h>
33 #include <trace/events/power.h>
38 static int nocompress
;
40 static int nohibernate
;
41 static int resume_wait
;
42 static unsigned int resume_delay
;
43 static char resume_file
[256] = CONFIG_PM_STD_PARTITION
;
44 dev_t swsusp_resume_device
;
45 sector_t swsusp_resume_block
;
46 __visible
int in_suspend __nosavedata
;
56 HIBERNATION_TEST_RESUME
,
58 __HIBERNATION_AFTER_LAST
60 #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
61 #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
63 static int hibernation_mode
= HIBERNATION_SHUTDOWN
;
65 bool freezer_test_done
;
67 static const struct platform_hibernation_ops
*hibernation_ops
;
69 bool hibernation_available(void)
71 return ((nohibernate
== 0) && !secure_modules());
75 * hibernation_set_ops - Set the global hibernate operations.
76 * @ops: Hibernation operations to use in subsequent hibernation transitions.
78 void hibernation_set_ops(const struct platform_hibernation_ops
*ops
)
80 if (ops
&& !(ops
->begin
&& ops
->end
&& ops
->pre_snapshot
81 && ops
->prepare
&& ops
->finish
&& ops
->enter
&& ops
->pre_restore
82 && ops
->restore_cleanup
&& ops
->leave
)) {
87 hibernation_ops
= ops
;
89 hibernation_mode
= HIBERNATION_PLATFORM
;
90 else if (hibernation_mode
== HIBERNATION_PLATFORM
)
91 hibernation_mode
= HIBERNATION_SHUTDOWN
;
93 unlock_system_sleep();
95 EXPORT_SYMBOL_GPL(hibernation_set_ops
);
97 static bool entering_platform_hibernation
;
99 bool system_entering_hibernation(void)
101 return entering_platform_hibernation
;
103 EXPORT_SYMBOL(system_entering_hibernation
);
105 #ifdef CONFIG_PM_DEBUG
106 static void hibernation_debug_sleep(void)
108 printk(KERN_INFO
"hibernation debug: Waiting for 5 seconds.\n");
112 static int hibernation_test(int level
)
114 if (pm_test_level
== level
) {
115 hibernation_debug_sleep();
120 #else /* !CONFIG_PM_DEBUG */
121 static int hibernation_test(int level
) { return 0; }
122 #endif /* !CONFIG_PM_DEBUG */
125 * platform_begin - Call platform to start hibernation.
126 * @platform_mode: Whether or not to use the platform driver.
128 static int platform_begin(int platform_mode
)
130 return (platform_mode
&& hibernation_ops
) ?
131 hibernation_ops
->begin() : 0;
135 * platform_end - Call platform to finish transition to the working state.
136 * @platform_mode: Whether or not to use the platform driver.
138 static void platform_end(int platform_mode
)
140 if (platform_mode
&& hibernation_ops
)
141 hibernation_ops
->end();
145 * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
146 * @platform_mode: Whether or not to use the platform driver.
148 * Use the platform driver to prepare the system for creating a hibernate image,
149 * if so configured, and return an error code if that fails.
152 static int platform_pre_snapshot(int platform_mode
)
154 return (platform_mode
&& hibernation_ops
) ?
155 hibernation_ops
->pre_snapshot() : 0;
159 * platform_leave - Call platform to prepare a transition to the working state.
160 * @platform_mode: Whether or not to use the platform driver.
162 * Use the platform driver prepare to prepare the machine for switching to the
163 * normal mode of operation.
165 * This routine is called on one CPU with interrupts disabled.
167 static void platform_leave(int platform_mode
)
169 if (platform_mode
&& hibernation_ops
)
170 hibernation_ops
->leave();
174 * platform_finish - Call platform to switch the system to the working state.
175 * @platform_mode: Whether or not to use the platform driver.
177 * Use the platform driver to switch the machine to the normal mode of
180 * This routine must be called after platform_prepare().
182 static void platform_finish(int platform_mode
)
184 if (platform_mode
&& hibernation_ops
)
185 hibernation_ops
->finish();
189 * platform_pre_restore - Prepare for hibernate image restoration.
190 * @platform_mode: Whether or not to use the platform driver.
192 * Use the platform driver to prepare the system for resume from a hibernation
195 * If the restore fails after this function has been called,
196 * platform_restore_cleanup() must be called.
198 static int platform_pre_restore(int platform_mode
)
200 return (platform_mode
&& hibernation_ops
) ?
201 hibernation_ops
->pre_restore() : 0;
205 * platform_restore_cleanup - Switch to the working state after failing restore.
206 * @platform_mode: Whether or not to use the platform driver.
208 * Use the platform driver to switch the system to the normal mode of operation
209 * after a failing restore.
211 * If platform_pre_restore() has been called before the failing restore, this
212 * function must be called too, regardless of the result of
213 * platform_pre_restore().
215 static void platform_restore_cleanup(int platform_mode
)
217 if (platform_mode
&& hibernation_ops
)
218 hibernation_ops
->restore_cleanup();
222 * platform_recover - Recover from a failure to suspend devices.
223 * @platform_mode: Whether or not to use the platform driver.
225 static void platform_recover(int platform_mode
)
227 if (platform_mode
&& hibernation_ops
&& hibernation_ops
->recover
)
228 hibernation_ops
->recover();
232 * swsusp_show_speed - Print time elapsed between two events during hibernation.
233 * @start: Starting event.
234 * @stop: Final event.
235 * @nr_pages: Number of memory pages processed between @start and @stop.
236 * @msg: Additional diagnostic message to print.
238 void swsusp_show_speed(ktime_t start
, ktime_t stop
,
239 unsigned nr_pages
, char *msg
)
242 u64 elapsed_centisecs64
;
243 unsigned int centisecs
;
247 diff
= ktime_sub(stop
, start
);
248 elapsed_centisecs64
= ktime_divns(diff
, 10*NSEC_PER_MSEC
);
249 centisecs
= elapsed_centisecs64
;
251 centisecs
= 1; /* avoid div-by-zero */
252 k
= nr_pages
* (PAGE_SIZE
/ 1024);
253 kps
= (k
* 100) / centisecs
;
254 printk(KERN_INFO
"PM: %s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n",
256 centisecs
/ 100, centisecs
% 100,
257 kps
/ 1000, (kps
% 1000) / 10);
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 printk(KERN_ERR
"PM: Some devices failed to power down, "
276 "aborting hibernation\n");
280 error
= platform_pre_snapshot(platform_mode
);
281 if (error
|| hibernation_test(TEST_PLATFORM
))
282 goto Platform_finish
;
284 error
= disable_nonboot_cpus();
285 if (error
|| hibernation_test(TEST_CPUS
))
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 /* Restore control flow magically appears here */
305 restore_processor_state();
306 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE
, false);
308 printk(KERN_ERR
"PM: Error %d creating hibernation image\n",
311 events_check_enabled
= false;
315 platform_leave(platform_mode
);
324 enable_nonboot_cpus();
327 platform_finish(platform_mode
);
329 dpm_resume_start(in_suspend
?
330 (error
? PMSG_RECOVER
: PMSG_THAW
) : PMSG_RESTORE
);
336 * hibernation_snapshot - Quiesce devices and create a hibernation image.
337 * @platform_mode: If set, use platform driver to prepare for the transition.
339 * This routine must be called with pm_mutex held.
341 int hibernation_snapshot(int platform_mode
)
346 pm_suspend_clear_flags();
347 error
= platform_begin(platform_mode
);
351 /* Preallocate image memory before shutting down devices. */
352 error
= hibernate_preallocate_memory();
356 error
= freeze_kernel_threads();
360 if (hibernation_test(TEST_FREEZER
)) {
363 * Indicate to the caller that we are returning due to a
364 * successful freezer test.
366 freezer_test_done
= true;
370 error
= dpm_prepare(PMSG_FREEZE
);
372 dpm_complete(PMSG_RECOVER
);
377 pm_restrict_gfp_mask();
379 error
= dpm_suspend(PMSG_FREEZE
);
381 if (error
|| hibernation_test(TEST_DEVICES
))
382 platform_recover(platform_mode
);
384 error
= create_image(platform_mode
);
387 * In the case that we call create_image() above, the control
388 * returns here (1) after the image has been created or the
389 * image creation has failed and (2) after a successful restore.
392 /* We may need to release the preallocated image pages here. */
393 if (error
|| !in_suspend
)
396 msg
= in_suspend
? (error
? PMSG_RECOVER
: PMSG_THAW
) : PMSG_RESTORE
;
399 if (error
|| !in_suspend
)
400 pm_restore_gfp_mask();
406 platform_end(platform_mode
);
410 thaw_kernel_threads();
416 int __weak
hibernate_resume_nonboot_cpu_disable(void)
418 return disable_nonboot_cpus();
422 * resume_target_kernel - Restore system state from a hibernation image.
423 * @platform_mode: Whether or not to use the platform driver.
425 * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
426 * contents of highmem that have not been restored yet from the image and run
427 * the low-level code that will restore the remaining contents of memory and
428 * switch to the just restored target kernel.
430 static int resume_target_kernel(bool platform_mode
)
434 error
= dpm_suspend_end(PMSG_QUIESCE
);
436 printk(KERN_ERR
"PM: Some devices failed to power down, "
437 "aborting resume\n");
441 error
= platform_pre_restore(platform_mode
);
445 error
= hibernate_resume_nonboot_cpu_disable();
451 error
= syscore_suspend();
455 save_processor_state();
456 error
= restore_highmem();
458 error
= swsusp_arch_resume();
460 * The code below is only ever reached in case of a failure.
461 * Otherwise, execution continues at the place where
462 * swsusp_arch_suspend() was called.
466 * This call to restore_highmem() reverts the changes made by
472 * The only reason why swsusp_arch_resume() can fail is memory being
473 * very tight, so we have to free it as soon as we can to avoid
474 * subsequent failures.
477 restore_processor_state();
478 touch_softlockup_watchdog();
486 enable_nonboot_cpus();
489 platform_restore_cleanup(platform_mode
);
491 dpm_resume_start(PMSG_RECOVER
);
497 * hibernation_restore - Quiesce devices and restore from a hibernation image.
498 * @platform_mode: If set, use platform driver to prepare for the transition.
500 * This routine must be called with pm_mutex held. If it is successful, control
501 * reappears in the restored target kernel in hibernation_snapshot().
503 int hibernation_restore(int platform_mode
)
507 pm_prepare_console();
509 pm_restrict_gfp_mask();
510 error
= dpm_suspend_start(PMSG_QUIESCE
);
512 error
= resume_target_kernel(platform_mode
);
514 * The above should either succeed and jump to the new kernel,
515 * or return with an error. Otherwise things are just
516 * undefined, so let's be paranoid.
520 dpm_resume_end(PMSG_RECOVER
);
521 pm_restore_gfp_mask();
523 pm_restore_console();
528 * hibernation_platform_enter - Power off the system using the platform driver.
530 int hibernation_platform_enter(void)
534 if (!hibernation_ops
)
538 * We have cancelled the power transition by running
539 * hibernation_ops->finish() before saving the image, so we should let
540 * the firmware know that we're going to enter the sleep state after all
542 error
= hibernation_ops
->begin();
546 entering_platform_hibernation
= true;
548 error
= dpm_suspend_start(PMSG_HIBERNATE
);
550 if (hibernation_ops
->recover
)
551 hibernation_ops
->recover();
555 error
= dpm_suspend_end(PMSG_HIBERNATE
);
559 error
= hibernation_ops
->prepare();
561 goto Platform_finish
;
563 error
= disable_nonboot_cpus();
569 if (pm_wakeup_pending()) {
574 hibernation_ops
->enter();
575 /* We should never get here */
583 enable_nonboot_cpus();
586 hibernation_ops
->finish();
588 dpm_resume_start(PMSG_RESTORE
);
591 entering_platform_hibernation
= false;
592 dpm_resume_end(PMSG_RESTORE
);
596 hibernation_ops
->end();
602 * power_down - Shut the machine down for hibernation.
604 * Use the platform driver, if configured, to put the system into the sleep
605 * state corresponding to hibernation, or try to power it off or reboot,
606 * depending on the value of hibernation_mode.
608 static void power_down(void)
610 #ifdef CONFIG_SUSPEND
614 switch (hibernation_mode
) {
615 case HIBERNATION_REBOOT
:
616 kernel_restart(NULL
);
618 case HIBERNATION_PLATFORM
:
619 hibernation_platform_enter();
620 case HIBERNATION_SHUTDOWN
:
624 #ifdef CONFIG_SUSPEND
625 case HIBERNATION_SUSPEND
:
626 error
= suspend_devices_and_enter(PM_SUSPEND_MEM
);
629 hibernation_mode
= HIBERNATION_PLATFORM
;
631 hibernation_mode
= HIBERNATION_SHUTDOWN
;
635 * Restore swap signature.
637 error
= swsusp_unmark();
639 printk(KERN_ERR
"PM: Swap will be unusable! "
646 * Valid image is on the disk, if we continue we risk serious data
647 * corruption after resume.
649 printk(KERN_CRIT
"PM: Please power down manually\n");
654 static int load_image_and_restore(void)
659 pr_debug("PM: Loading hibernation image.\n");
661 lock_device_hotplug();
662 error
= create_basic_memory_bitmaps();
666 error
= swsusp_read(&flags
);
667 swsusp_close(FMODE_READ
);
669 hibernation_restore(flags
& SF_PLATFORM_MODE
);
671 printk(KERN_ERR
"PM: Failed to load hibernation image, recovering.\n");
673 free_basic_memory_bitmaps();
675 unlock_device_hotplug();
681 * hibernate - Carry out system hibernation, including saving the image.
685 int error
, nr_calls
= 0;
686 bool snapshot_test
= false;
688 if (!hibernation_available()) {
689 pr_debug("PM: Hibernation not available.\n");
694 /* The snapshot device should not be opened while we're running */
695 if (!atomic_add_unless(&snapshot_device_available
, -1, 0)) {
700 pm_prepare_console();
701 error
= __pm_notifier_call_chain(PM_HIBERNATION_PREPARE
, -1, &nr_calls
);
707 printk(KERN_INFO
"PM: Syncing filesystems ... ");
711 error
= freeze_processes();
715 lock_device_hotplug();
716 /* Allocate memory management structures */
717 error
= create_basic_memory_bitmaps();
721 error
= hibernation_snapshot(hibernation_mode
== HIBERNATION_PLATFORM
);
722 if (error
|| freezer_test_done
)
726 unsigned int flags
= 0;
728 if (hibernation_mode
== HIBERNATION_PLATFORM
)
729 flags
|= SF_PLATFORM_MODE
;
731 flags
|= SF_NOCOMPRESS_MODE
;
733 flags
|= SF_CRC32_MODE
;
735 pr_debug("PM: writing image.\n");
736 error
= swsusp_write(flags
);
739 if (hibernation_mode
== HIBERNATION_TEST_RESUME
)
740 snapshot_test
= true;
745 pm_restore_gfp_mask();
747 pr_debug("PM: Image restored successfully.\n");
751 free_basic_memory_bitmaps();
753 unlock_device_hotplug();
755 pr_debug("PM: Checking hibernation image\n");
756 error
= swsusp_check();
758 error
= load_image_and_restore();
762 /* Don't bother checking whether freezer_test_done is true */
763 freezer_test_done
= false;
765 __pm_notifier_call_chain(PM_POST_HIBERNATION
, nr_calls
, NULL
);
766 pm_restore_console();
767 atomic_inc(&snapshot_device_available
);
769 unlock_system_sleep();
775 * software_resume - Resume from a saved hibernation image.
777 * This routine is called as a late initcall, when all devices have been
778 * discovered and initialized already.
780 * The image reading code is called to see if there is a hibernation image
781 * available for reading. If that is the case, devices are quiesced and the
782 * contents of memory is restored from the saved image.
784 * If this is successful, control reappears in the restored target kernel in
785 * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
786 * attempts to recover gracefully and make the kernel return to the normal mode
789 static int software_resume(void)
791 int error
, nr_calls
= 0;
794 * If the user said "noresume".. bail out early.
796 if (noresume
|| !hibernation_available())
800 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
801 * is configured into the kernel. Since the regular hibernate
802 * trigger path is via sysfs which takes a buffer mutex before
803 * calling hibernate functions (which take pm_mutex) this can
804 * cause lockdep to complain about a possible ABBA deadlock
805 * which cannot happen since we're in the boot code here and
806 * sysfs can't be invoked yet. Therefore, we use a subclass
807 * here to avoid lockdep complaining.
809 mutex_lock_nested(&pm_mutex
, SINGLE_DEPTH_NESTING
);
811 if (swsusp_resume_device
)
814 if (!strlen(resume_file
)) {
819 pr_debug("PM: Checking hibernation image partition %s\n", resume_file
);
822 printk(KERN_INFO
"Waiting %dsec before reading resume device...\n",
824 ssleep(resume_delay
);
827 /* Check if the device is there */
828 swsusp_resume_device
= name_to_dev_t(resume_file
);
831 * name_to_dev_t is ineffective to verify parition if resume_file is in
832 * integer format. (e.g. major:minor)
834 if (isdigit(resume_file
[0]) && resume_wait
) {
836 while (!get_gendisk(swsusp_resume_device
, &partno
))
840 if (!swsusp_resume_device
) {
842 * Some device discovery might still be in progress; we need
843 * to wait for this to finish.
845 wait_for_device_probe();
848 while ((swsusp_resume_device
= name_to_dev_t(resume_file
)) == 0)
850 async_synchronize_full();
853 swsusp_resume_device
= name_to_dev_t(resume_file
);
854 if (!swsusp_resume_device
) {
861 pr_debug("PM: Hibernation image partition %d:%d present\n",
862 MAJOR(swsusp_resume_device
), MINOR(swsusp_resume_device
));
864 pr_debug("PM: Looking for hibernation image.\n");
865 error
= swsusp_check();
869 /* The snapshot device should not be opened while we're running */
870 if (!atomic_add_unless(&snapshot_device_available
, -1, 0)) {
872 swsusp_close(FMODE_READ
);
876 pm_prepare_console();
877 error
= __pm_notifier_call_chain(PM_RESTORE_PREPARE
, -1, &nr_calls
);
883 pr_debug("PM: Preparing processes for restore.\n");
884 error
= freeze_processes();
887 error
= load_image_and_restore();
890 __pm_notifier_call_chain(PM_POST_RESTORE
, nr_calls
, NULL
);
891 pm_restore_console();
892 atomic_inc(&snapshot_device_available
);
893 /* For success case, the suspend path will release the lock */
895 mutex_unlock(&pm_mutex
);
896 pr_debug("PM: Hibernation image not present or could not be loaded.\n");
899 swsusp_close(FMODE_READ
);
903 late_initcall_sync(software_resume
);
906 static const char * const hibernation_modes
[] = {
907 [HIBERNATION_PLATFORM
] = "platform",
908 [HIBERNATION_SHUTDOWN
] = "shutdown",
909 [HIBERNATION_REBOOT
] = "reboot",
910 #ifdef CONFIG_SUSPEND
911 [HIBERNATION_SUSPEND
] = "suspend",
913 [HIBERNATION_TEST_RESUME
] = "test_resume",
917 * /sys/power/disk - Control hibernation mode.
919 * Hibernation can be handled in several ways. There are a few different ways
920 * to put the system into the sleep state: using the platform driver (e.g. ACPI
921 * or other hibernation_ops), powering it off or rebooting it (for testing
924 * The sysfs file /sys/power/disk provides an interface for selecting the
925 * hibernation mode to use. Reading from this file causes the available modes
926 * to be printed. There are 3 modes that can be supported:
932 * If a platform hibernation driver is in use, 'platform' will be supported
933 * and will be used by default. Otherwise, 'shutdown' will be used by default.
934 * The selected option (i.e. the one corresponding to the current value of
935 * hibernation_mode) is enclosed by a square bracket.
937 * To select a given hibernation mode it is necessary to write the mode's
938 * string representation (as returned by reading from /sys/power/disk) back
939 * into /sys/power/disk.
942 static ssize_t
disk_show(struct kobject
*kobj
, struct kobj_attribute
*attr
,
948 if (!hibernation_available())
949 return sprintf(buf
, "[disabled]\n");
951 for (i
= HIBERNATION_FIRST
; i
<= HIBERNATION_MAX
; i
++) {
952 if (!hibernation_modes
[i
])
955 case HIBERNATION_SHUTDOWN
:
956 case HIBERNATION_REBOOT
:
957 #ifdef CONFIG_SUSPEND
958 case HIBERNATION_SUSPEND
:
960 case HIBERNATION_TEST_RESUME
:
962 case HIBERNATION_PLATFORM
:
965 /* not a valid mode, continue with loop */
968 if (i
== hibernation_mode
)
969 buf
+= sprintf(buf
, "[%s] ", hibernation_modes
[i
]);
971 buf
+= sprintf(buf
, "%s ", hibernation_modes
[i
]);
973 buf
+= sprintf(buf
, "\n");
977 static ssize_t
disk_store(struct kobject
*kobj
, struct kobj_attribute
*attr
,
978 const char *buf
, size_t n
)
984 int mode
= HIBERNATION_INVALID
;
986 if (!hibernation_available())
989 p
= memchr(buf
, '\n', n
);
990 len
= p
? p
- buf
: n
;
993 for (i
= HIBERNATION_FIRST
; i
<= HIBERNATION_MAX
; i
++) {
994 if (len
== strlen(hibernation_modes
[i
])
995 && !strncmp(buf
, hibernation_modes
[i
], len
)) {
1000 if (mode
!= HIBERNATION_INVALID
) {
1002 case HIBERNATION_SHUTDOWN
:
1003 case HIBERNATION_REBOOT
:
1004 #ifdef CONFIG_SUSPEND
1005 case HIBERNATION_SUSPEND
:
1007 case HIBERNATION_TEST_RESUME
:
1008 hibernation_mode
= mode
;
1010 case HIBERNATION_PLATFORM
:
1011 if (hibernation_ops
)
1012 hibernation_mode
= mode
;
1020 pr_debug("PM: Hibernation mode set to '%s'\n",
1021 hibernation_modes
[mode
]);
1022 unlock_system_sleep();
1023 return error
? error
: n
;
1028 static ssize_t
resume_show(struct kobject
*kobj
, struct kobj_attribute
*attr
,
1031 return sprintf(buf
,"%d:%d\n", MAJOR(swsusp_resume_device
),
1032 MINOR(swsusp_resume_device
));
1035 static ssize_t
resume_store(struct kobject
*kobj
, struct kobj_attribute
*attr
,
1036 const char *buf
, size_t n
)
1042 if (len
&& buf
[len
-1] == '\n')
1044 name
= kstrndup(buf
, len
, GFP_KERNEL
);
1048 res
= name_to_dev_t(name
);
1053 lock_system_sleep();
1054 swsusp_resume_device
= res
;
1055 unlock_system_sleep();
1056 printk(KERN_INFO
"PM: Starting manual resume from disk\n");
1064 static ssize_t
image_size_show(struct kobject
*kobj
, struct kobj_attribute
*attr
,
1067 return sprintf(buf
, "%lu\n", image_size
);
1070 static ssize_t
image_size_store(struct kobject
*kobj
, struct kobj_attribute
*attr
,
1071 const char *buf
, size_t n
)
1075 if (sscanf(buf
, "%lu", &size
) == 1) {
1083 power_attr(image_size
);
1085 static ssize_t
reserved_size_show(struct kobject
*kobj
,
1086 struct kobj_attribute
*attr
, char *buf
)
1088 return sprintf(buf
, "%lu\n", reserved_size
);
1091 static ssize_t
reserved_size_store(struct kobject
*kobj
,
1092 struct kobj_attribute
*attr
,
1093 const char *buf
, size_t n
)
1097 if (sscanf(buf
, "%lu", &size
) == 1) {
1098 reserved_size
= size
;
1105 power_attr(reserved_size
);
1107 static struct attribute
* g
[] = {
1110 &image_size_attr
.attr
,
1111 &reserved_size_attr
.attr
,
1116 static struct attribute_group attr_group
= {
1121 static int __init
pm_disk_init(void)
1123 return sysfs_create_group(power_kobj
, &attr_group
);
1126 core_initcall(pm_disk_init
);
1129 static int __init
resume_setup(char *str
)
1134 strncpy( resume_file
, str
, 255 );
1138 static int __init
resume_offset_setup(char *str
)
1140 unsigned long long offset
;
1145 if (sscanf(str
, "%llu", &offset
) == 1)
1146 swsusp_resume_block
= offset
;
1151 static int __init
hibernate_setup(char *str
)
1153 if (!strncmp(str
, "noresume", 8)) {
1155 } else if (!strncmp(str
, "nocompress", 10)) {
1157 } else if (!strncmp(str
, "no", 2)) {
1160 } else if (IS_ENABLED(CONFIG_DEBUG_RODATA
)
1161 && !strncmp(str
, "protect_image", 13)) {
1162 enable_restore_image_protection();
1167 static int __init
noresume_setup(char *str
)
1173 static int __init
resumewait_setup(char *str
)
1179 static int __init
resumedelay_setup(char *str
)
1181 int rc
= kstrtouint(str
, 0, &resume_delay
);
1188 static int __init
nohibernate_setup(char *str
)
1195 __setup("noresume", noresume_setup
);
1196 __setup("resume_offset=", resume_offset_setup
);
1197 __setup("resume=", resume_setup
);
1198 __setup("hibernate=", hibernate_setup
);
1199 __setup("resumewait", resumewait_setup
);
1200 __setup("resumedelay=", resumedelay_setup
);
1201 __setup("nohibernate", nohibernate_setup
);