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 && !kernel_is_locked_down("Hibernation");
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 error
= syscore_suspend();
297 pr_err("Some system devices failed to power down, aborting hibernation\n");
301 if (hibernation_test(TEST_CORE
) || pm_wakeup_pending())
305 save_processor_state();
306 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE
, true);
307 error
= swsusp_arch_suspend();
308 /* Restore control flow magically appears here */
309 restore_processor_state();
310 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE
, false);
312 pr_err("Error %d creating hibernation image\n", error
);
315 events_check_enabled
= false;
319 platform_leave(platform_mode
);
328 enable_nonboot_cpus();
330 /* Allow architectures to do nosmt-specific post-resume dances */
332 error
= arch_resume_nosmt();
335 platform_finish(platform_mode
);
337 dpm_resume_start(in_suspend
?
338 (error
? PMSG_RECOVER
: PMSG_THAW
) : PMSG_RESTORE
);
344 * hibernation_snapshot - Quiesce devices and create a hibernation image.
345 * @platform_mode: If set, use platform driver to prepare for the transition.
347 * This routine must be called with pm_mutex held.
349 int hibernation_snapshot(int platform_mode
)
354 pm_suspend_clear_flags();
355 error
= platform_begin(platform_mode
);
359 /* Preallocate image memory before shutting down devices. */
360 error
= hibernate_preallocate_memory();
364 error
= freeze_kernel_threads();
368 if (hibernation_test(TEST_FREEZER
)) {
371 * Indicate to the caller that we are returning due to a
372 * successful freezer test.
374 freezer_test_done
= true;
378 error
= dpm_prepare(PMSG_FREEZE
);
380 dpm_complete(PMSG_RECOVER
);
385 pm_restrict_gfp_mask();
387 error
= dpm_suspend(PMSG_FREEZE
);
389 if (error
|| hibernation_test(TEST_DEVICES
))
390 platform_recover(platform_mode
);
392 error
= create_image(platform_mode
);
395 * In the case that we call create_image() above, the control
396 * returns here (1) after the image has been created or the
397 * image creation has failed and (2) after a successful restore.
400 /* We may need to release the preallocated image pages here. */
401 if (error
|| !in_suspend
)
404 msg
= in_suspend
? (error
? PMSG_RECOVER
: PMSG_THAW
) : PMSG_RESTORE
;
407 if (error
|| !in_suspend
)
408 pm_restore_gfp_mask();
414 platform_end(platform_mode
);
418 thaw_kernel_threads();
424 int __weak
hibernate_resume_nonboot_cpu_disable(void)
426 return disable_nonboot_cpus();
430 * resume_target_kernel - Restore system state from a hibernation image.
431 * @platform_mode: Whether or not to use the platform driver.
433 * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
434 * contents of highmem that have not been restored yet from the image and run
435 * the low-level code that will restore the remaining contents of memory and
436 * switch to the just restored target kernel.
438 static int resume_target_kernel(bool platform_mode
)
442 error
= dpm_suspend_end(PMSG_QUIESCE
);
444 pr_err("Some devices failed to power down, aborting resume\n");
448 error
= platform_pre_restore(platform_mode
);
452 error
= hibernate_resume_nonboot_cpu_disable();
458 error
= syscore_suspend();
462 save_processor_state();
463 error
= restore_highmem();
465 error
= swsusp_arch_resume();
467 * The code below is only ever reached in case of a failure.
468 * Otherwise, execution continues at the place where
469 * swsusp_arch_suspend() was called.
473 * This call to restore_highmem() reverts the changes made by
479 * The only reason why swsusp_arch_resume() can fail is memory being
480 * very tight, so we have to free it as soon as we can to avoid
481 * subsequent failures.
484 restore_processor_state();
485 touch_softlockup_watchdog();
493 enable_nonboot_cpus();
496 platform_restore_cleanup(platform_mode
);
498 dpm_resume_start(PMSG_RECOVER
);
504 * hibernation_restore - Quiesce devices and restore from a hibernation image.
505 * @platform_mode: If set, use platform driver to prepare for the transition.
507 * This routine must be called with pm_mutex held. If it is successful, control
508 * reappears in the restored target kernel in hibernation_snapshot().
510 int hibernation_restore(int platform_mode
)
514 pm_prepare_console();
516 pm_restrict_gfp_mask();
517 error
= dpm_suspend_start(PMSG_QUIESCE
);
519 error
= resume_target_kernel(platform_mode
);
521 * The above should either succeed and jump to the new kernel,
522 * or return with an error. Otherwise things are just
523 * undefined, so let's be paranoid.
527 dpm_resume_end(PMSG_RECOVER
);
528 pm_restore_gfp_mask();
530 pm_restore_console();
535 * hibernation_platform_enter - Power off the system using the platform driver.
537 int hibernation_platform_enter(void)
541 if (!hibernation_ops
)
545 * We have cancelled the power transition by running
546 * hibernation_ops->finish() before saving the image, so we should let
547 * the firmware know that we're going to enter the sleep state after all
549 error
= hibernation_ops
->begin();
553 entering_platform_hibernation
= true;
555 error
= dpm_suspend_start(PMSG_HIBERNATE
);
557 if (hibernation_ops
->recover
)
558 hibernation_ops
->recover();
562 error
= dpm_suspend_end(PMSG_HIBERNATE
);
566 error
= hibernation_ops
->prepare();
568 goto Platform_finish
;
570 error
= disable_nonboot_cpus();
576 if (pm_wakeup_pending()) {
581 hibernation_ops
->enter();
582 /* We should never get here */
590 enable_nonboot_cpus();
593 hibernation_ops
->finish();
595 dpm_resume_start(PMSG_RESTORE
);
598 entering_platform_hibernation
= false;
599 dpm_resume_end(PMSG_RESTORE
);
603 hibernation_ops
->end();
609 * power_down - Shut the machine down for hibernation.
611 * Use the platform driver, if configured, to put the system into the sleep
612 * state corresponding to hibernation, or try to power it off or reboot,
613 * depending on the value of hibernation_mode.
615 static void power_down(void)
617 #ifdef CONFIG_SUSPEND
620 if (hibernation_mode
== HIBERNATION_SUSPEND
) {
621 error
= suspend_devices_and_enter(PM_SUSPEND_MEM
);
623 hibernation_mode
= hibernation_ops
?
624 HIBERNATION_PLATFORM
:
625 HIBERNATION_SHUTDOWN
;
627 /* Restore swap signature. */
628 error
= swsusp_unmark();
630 pr_err("Swap will be unusable! Try swapon -a.\n");
637 switch (hibernation_mode
) {
638 case HIBERNATION_REBOOT
:
639 kernel_restart(NULL
);
641 case HIBERNATION_PLATFORM
:
642 hibernation_platform_enter();
643 case HIBERNATION_SHUTDOWN
:
650 * Valid image is on the disk, if we continue we risk serious data
651 * corruption after resume.
653 pr_crit("Power down manually\n");
658 static int load_image_and_restore(void)
663 pm_pr_dbg("Loading hibernation image.\n");
665 lock_device_hotplug();
666 error
= create_basic_memory_bitmaps();
670 error
= swsusp_read(&flags
);
671 swsusp_close(FMODE_READ
);
673 hibernation_restore(flags
& SF_PLATFORM_MODE
);
675 pr_err("Failed to load hibernation image, recovering.\n");
677 free_basic_memory_bitmaps();
679 unlock_device_hotplug();
685 * hibernate - Carry out system hibernation, including saving the image.
689 int error
, nr_calls
= 0;
690 bool snapshot_test
= false;
692 if (!hibernation_available()) {
693 pm_pr_dbg("Hibernation not available.\n");
698 /* The snapshot device should not be opened while we're running */
699 if (!atomic_add_unless(&snapshot_device_available
, -1, 0)) {
704 pr_info("hibernation entry\n");
705 pm_prepare_console();
706 error
= __pm_notifier_call_chain(PM_HIBERNATION_PREPARE
, -1, &nr_calls
);
712 pr_info("Syncing filesystems ... \n");
716 error
= freeze_processes();
720 lock_device_hotplug();
721 /* Allocate memory management structures */
722 error
= create_basic_memory_bitmaps();
726 error
= hibernation_snapshot(hibernation_mode
== HIBERNATION_PLATFORM
);
727 if (error
|| freezer_test_done
)
731 unsigned int flags
= 0;
733 if (hibernation_mode
== HIBERNATION_PLATFORM
)
734 flags
|= SF_PLATFORM_MODE
;
736 flags
|= SF_NOCOMPRESS_MODE
;
738 flags
|= SF_CRC32_MODE
;
740 pm_pr_dbg("Writing image.\n");
741 error
= swsusp_write(flags
);
744 if (hibernation_mode
== HIBERNATION_TEST_RESUME
)
745 snapshot_test
= true;
750 pm_restore_gfp_mask();
752 pm_pr_dbg("Image restored successfully.\n");
756 free_basic_memory_bitmaps();
758 unlock_device_hotplug();
760 pm_pr_dbg("Checking hibernation image\n");
761 error
= swsusp_check();
763 error
= load_image_and_restore();
767 /* Don't bother checking whether freezer_test_done is true */
768 freezer_test_done
= false;
770 __pm_notifier_call_chain(PM_POST_HIBERNATION
, nr_calls
, NULL
);
771 pm_restore_console();
772 atomic_inc(&snapshot_device_available
);
774 unlock_system_sleep();
775 pr_info("hibernation exit\n");
782 * software_resume - Resume from a saved hibernation image.
784 * This routine is called as a late initcall, when all devices have been
785 * discovered and initialized already.
787 * The image reading code is called to see if there is a hibernation image
788 * available for reading. If that is the case, devices are quiesced and the
789 * contents of memory is restored from the saved image.
791 * If this is successful, control reappears in the restored target kernel in
792 * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
793 * attempts to recover gracefully and make the kernel return to the normal mode
796 static int software_resume(void)
798 int error
, nr_calls
= 0;
801 * If the user said "noresume".. bail out early.
803 if (noresume
|| !hibernation_available())
807 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
808 * is configured into the kernel. Since the regular hibernate
809 * trigger path is via sysfs which takes a buffer mutex before
810 * calling hibernate functions (which take pm_mutex) this can
811 * cause lockdep to complain about a possible ABBA deadlock
812 * which cannot happen since we're in the boot code here and
813 * sysfs can't be invoked yet. Therefore, we use a subclass
814 * here to avoid lockdep complaining.
816 mutex_lock_nested(&pm_mutex
, SINGLE_DEPTH_NESTING
);
818 if (swsusp_resume_device
)
821 if (!strlen(resume_file
)) {
826 pm_pr_dbg("Checking hibernation image partition %s\n", resume_file
);
829 pr_info("Waiting %dsec before reading resume device ...\n",
831 ssleep(resume_delay
);
834 /* Check if the device is there */
835 swsusp_resume_device
= name_to_dev_t(resume_file
);
838 * name_to_dev_t is ineffective to verify parition if resume_file is in
839 * integer format. (e.g. major:minor)
841 if (isdigit(resume_file
[0]) && resume_wait
) {
843 while (!get_gendisk(swsusp_resume_device
, &partno
))
847 if (!swsusp_resume_device
) {
849 * Some device discovery might still be in progress; we need
850 * to wait for this to finish.
852 wait_for_device_probe();
855 while ((swsusp_resume_device
= name_to_dev_t(resume_file
)) == 0)
857 async_synchronize_full();
860 swsusp_resume_device
= name_to_dev_t(resume_file
);
861 if (!swsusp_resume_device
) {
868 pm_pr_dbg("Hibernation image partition %d:%d present\n",
869 MAJOR(swsusp_resume_device
), MINOR(swsusp_resume_device
));
871 pm_pr_dbg("Looking for hibernation image.\n");
872 error
= swsusp_check();
876 /* The snapshot device should not be opened while we're running */
877 if (!atomic_add_unless(&snapshot_device_available
, -1, 0)) {
879 swsusp_close(FMODE_READ
);
883 pr_info("resume from hibernation\n");
884 pm_prepare_console();
885 error
= __pm_notifier_call_chain(PM_RESTORE_PREPARE
, -1, &nr_calls
);
891 pm_pr_dbg("Preparing processes for restore.\n");
892 error
= freeze_processes();
895 error
= load_image_and_restore();
898 __pm_notifier_call_chain(PM_POST_RESTORE
, nr_calls
, NULL
);
899 pm_restore_console();
900 pr_info("resume from hibernation failed (%d)\n", error
);
901 atomic_inc(&snapshot_device_available
);
902 /* For success case, the suspend path will release the lock */
904 mutex_unlock(&pm_mutex
);
905 pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
908 swsusp_close(FMODE_READ
);
912 late_initcall_sync(software_resume
);
915 static const char * const hibernation_modes
[] = {
916 [HIBERNATION_PLATFORM
] = "platform",
917 [HIBERNATION_SHUTDOWN
] = "shutdown",
918 [HIBERNATION_REBOOT
] = "reboot",
919 #ifdef CONFIG_SUSPEND
920 [HIBERNATION_SUSPEND
] = "suspend",
922 [HIBERNATION_TEST_RESUME
] = "test_resume",
926 * /sys/power/disk - Control hibernation mode.
928 * Hibernation can be handled in several ways. There are a few different ways
929 * to put the system into the sleep state: using the platform driver (e.g. ACPI
930 * or other hibernation_ops), powering it off or rebooting it (for testing
933 * The sysfs file /sys/power/disk provides an interface for selecting the
934 * hibernation mode to use. Reading from this file causes the available modes
935 * to be printed. There are 3 modes that can be supported:
941 * If a platform hibernation driver is in use, 'platform' will be supported
942 * and will be used by default. Otherwise, 'shutdown' will be used by default.
943 * The selected option (i.e. the one corresponding to the current value of
944 * hibernation_mode) is enclosed by a square bracket.
946 * To select a given hibernation mode it is necessary to write the mode's
947 * string representation (as returned by reading from /sys/power/disk) back
948 * into /sys/power/disk.
951 static ssize_t
disk_show(struct kobject
*kobj
, struct kobj_attribute
*attr
,
957 if (!hibernation_available())
958 return sprintf(buf
, "[disabled]\n");
960 for (i
= HIBERNATION_FIRST
; i
<= HIBERNATION_MAX
; i
++) {
961 if (!hibernation_modes
[i
])
964 case HIBERNATION_SHUTDOWN
:
965 case HIBERNATION_REBOOT
:
966 #ifdef CONFIG_SUSPEND
967 case HIBERNATION_SUSPEND
:
969 case HIBERNATION_TEST_RESUME
:
971 case HIBERNATION_PLATFORM
:
974 /* not a valid mode, continue with loop */
977 if (i
== hibernation_mode
)
978 buf
+= sprintf(buf
, "[%s] ", hibernation_modes
[i
]);
980 buf
+= sprintf(buf
, "%s ", hibernation_modes
[i
]);
982 buf
+= sprintf(buf
, "\n");
986 static ssize_t
disk_store(struct kobject
*kobj
, struct kobj_attribute
*attr
,
987 const char *buf
, size_t n
)
993 int mode
= HIBERNATION_INVALID
;
995 if (!hibernation_available())
998 p
= memchr(buf
, '\n', n
);
999 len
= p
? p
- buf
: n
;
1001 lock_system_sleep();
1002 for (i
= HIBERNATION_FIRST
; i
<= HIBERNATION_MAX
; i
++) {
1003 if (len
== strlen(hibernation_modes
[i
])
1004 && !strncmp(buf
, hibernation_modes
[i
], len
)) {
1009 if (mode
!= HIBERNATION_INVALID
) {
1011 case HIBERNATION_SHUTDOWN
:
1012 case HIBERNATION_REBOOT
:
1013 #ifdef CONFIG_SUSPEND
1014 case HIBERNATION_SUSPEND
:
1016 case HIBERNATION_TEST_RESUME
:
1017 hibernation_mode
= mode
;
1019 case HIBERNATION_PLATFORM
:
1020 if (hibernation_ops
)
1021 hibernation_mode
= mode
;
1029 pm_pr_dbg("Hibernation mode set to '%s'\n",
1030 hibernation_modes
[mode
]);
1031 unlock_system_sleep();
1032 return error
? error
: n
;
1037 static ssize_t
resume_show(struct kobject
*kobj
, struct kobj_attribute
*attr
,
1040 return sprintf(buf
,"%d:%d\n", MAJOR(swsusp_resume_device
),
1041 MINOR(swsusp_resume_device
));
1044 static ssize_t
resume_store(struct kobject
*kobj
, struct kobj_attribute
*attr
,
1045 const char *buf
, size_t n
)
1051 if (len
&& buf
[len
-1] == '\n')
1053 name
= kstrndup(buf
, len
, GFP_KERNEL
);
1057 res
= name_to_dev_t(name
);
1062 lock_system_sleep();
1063 swsusp_resume_device
= res
;
1064 unlock_system_sleep();
1065 pr_info("Starting manual resume from disk\n");
1073 static ssize_t
resume_offset_show(struct kobject
*kobj
,
1074 struct kobj_attribute
*attr
, char *buf
)
1076 return sprintf(buf
, "%llu\n", (unsigned long long)swsusp_resume_block
);
1079 static ssize_t
resume_offset_store(struct kobject
*kobj
,
1080 struct kobj_attribute
*attr
, const char *buf
,
1083 unsigned long long offset
;
1086 rc
= kstrtoull(buf
, 0, &offset
);
1089 swsusp_resume_block
= offset
;
1094 power_attr(resume_offset
);
1096 static ssize_t
image_size_show(struct kobject
*kobj
, struct kobj_attribute
*attr
,
1099 return sprintf(buf
, "%lu\n", image_size
);
1102 static ssize_t
image_size_store(struct kobject
*kobj
, struct kobj_attribute
*attr
,
1103 const char *buf
, size_t n
)
1107 if (sscanf(buf
, "%lu", &size
) == 1) {
1115 power_attr(image_size
);
1117 static ssize_t
reserved_size_show(struct kobject
*kobj
,
1118 struct kobj_attribute
*attr
, char *buf
)
1120 return sprintf(buf
, "%lu\n", reserved_size
);
1123 static ssize_t
reserved_size_store(struct kobject
*kobj
,
1124 struct kobj_attribute
*attr
,
1125 const char *buf
, size_t n
)
1129 if (sscanf(buf
, "%lu", &size
) == 1) {
1130 reserved_size
= size
;
1137 power_attr(reserved_size
);
1139 static struct attribute
* g
[] = {
1141 &resume_offset_attr
.attr
,
1143 &image_size_attr
.attr
,
1144 &reserved_size_attr
.attr
,
1149 static const struct attribute_group attr_group
= {
1154 static int __init
pm_disk_init(void)
1156 return sysfs_create_group(power_kobj
, &attr_group
);
1159 core_initcall(pm_disk_init
);
1162 static int __init
resume_setup(char *str
)
1167 strncpy( resume_file
, str
, 255 );
1171 static int __init
resume_offset_setup(char *str
)
1173 unsigned long long offset
;
1178 if (sscanf(str
, "%llu", &offset
) == 1)
1179 swsusp_resume_block
= offset
;
1184 static int __init
hibernate_setup(char *str
)
1186 if (!strncmp(str
, "noresume", 8)) {
1188 } else if (!strncmp(str
, "nocompress", 10)) {
1190 } else if (!strncmp(str
, "no", 2)) {
1193 } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX
)
1194 && !strncmp(str
, "protect_image", 13)) {
1195 enable_restore_image_protection();
1200 static int __init
noresume_setup(char *str
)
1206 static int __init
resumewait_setup(char *str
)
1212 static int __init
resumedelay_setup(char *str
)
1214 int rc
= kstrtouint(str
, 0, &resume_delay
);
1221 static int __init
nohibernate_setup(char *str
)
1228 __setup("noresume", noresume_setup
);
1229 __setup("resume_offset=", resume_offset_setup
);
1230 __setup("resume=", resume_setup
);
1231 __setup("hibernate=", hibernate_setup
);
1232 __setup("resumewait", resumewait_setup
);
1233 __setup("resumedelay=", resumedelay_setup
);
1234 __setup("nohibernate", nohibernate_setup
);