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 <trace/events/power.h>
36 static int nocompress
;
38 static int nohibernate
;
39 static int resume_wait
;
40 static unsigned int resume_delay
;
41 static char resume_file
[256] = CONFIG_PM_STD_PARTITION
;
42 dev_t swsusp_resume_device
;
43 sector_t swsusp_resume_block
;
44 __visible
int in_suspend __nosavedata
;
55 __HIBERNATION_AFTER_LAST
57 #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
58 #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
60 static int hibernation_mode
= HIBERNATION_SHUTDOWN
;
62 bool freezer_test_done
;
64 static const struct platform_hibernation_ops
*hibernation_ops
;
66 bool hibernation_available(void)
68 return (nohibernate
== 0);
72 * hibernation_set_ops - Set the global hibernate operations.
73 * @ops: Hibernation operations to use in subsequent hibernation transitions.
75 void hibernation_set_ops(const struct platform_hibernation_ops
*ops
)
77 if (ops
&& !(ops
->begin
&& ops
->end
&& ops
->pre_snapshot
78 && ops
->prepare
&& ops
->finish
&& ops
->enter
&& ops
->pre_restore
79 && ops
->restore_cleanup
&& ops
->leave
)) {
84 hibernation_ops
= ops
;
86 hibernation_mode
= HIBERNATION_PLATFORM
;
87 else if (hibernation_mode
== HIBERNATION_PLATFORM
)
88 hibernation_mode
= HIBERNATION_SHUTDOWN
;
90 unlock_system_sleep();
92 EXPORT_SYMBOL_GPL(hibernation_set_ops
);
94 static bool entering_platform_hibernation
;
96 bool system_entering_hibernation(void)
98 return entering_platform_hibernation
;
100 EXPORT_SYMBOL(system_entering_hibernation
);
102 #ifdef CONFIG_PM_DEBUG
103 static void hibernation_debug_sleep(void)
105 printk(KERN_INFO
"hibernation debug: Waiting for 5 seconds.\n");
109 static int hibernation_test(int level
)
111 if (pm_test_level
== level
) {
112 hibernation_debug_sleep();
117 #else /* !CONFIG_PM_DEBUG */
118 static int hibernation_test(int level
) { return 0; }
119 #endif /* !CONFIG_PM_DEBUG */
122 * platform_begin - Call platform to start hibernation.
123 * @platform_mode: Whether or not to use the platform driver.
125 static int platform_begin(int platform_mode
)
127 return (platform_mode
&& hibernation_ops
) ?
128 hibernation_ops
->begin() : 0;
132 * platform_end - Call platform to finish transition to the working state.
133 * @platform_mode: Whether or not to use the platform driver.
135 static void platform_end(int platform_mode
)
137 if (platform_mode
&& hibernation_ops
)
138 hibernation_ops
->end();
142 * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
143 * @platform_mode: Whether or not to use the platform driver.
145 * Use the platform driver to prepare the system for creating a hibernate image,
146 * if so configured, and return an error code if that fails.
149 static int platform_pre_snapshot(int platform_mode
)
151 return (platform_mode
&& hibernation_ops
) ?
152 hibernation_ops
->pre_snapshot() : 0;
156 * platform_leave - Call platform to prepare a transition to the working state.
157 * @platform_mode: Whether or not to use the platform driver.
159 * Use the platform driver prepare to prepare the machine for switching to the
160 * normal mode of operation.
162 * This routine is called on one CPU with interrupts disabled.
164 static void platform_leave(int platform_mode
)
166 if (platform_mode
&& hibernation_ops
)
167 hibernation_ops
->leave();
171 * platform_finish - Call platform to switch the system to the working state.
172 * @platform_mode: Whether or not to use the platform driver.
174 * Use the platform driver to switch the machine to the normal mode of
177 * This routine must be called after platform_prepare().
179 static void platform_finish(int platform_mode
)
181 if (platform_mode
&& hibernation_ops
)
182 hibernation_ops
->finish();
186 * platform_pre_restore - Prepare for hibernate image restoration.
187 * @platform_mode: Whether or not to use the platform driver.
189 * Use the platform driver to prepare the system for resume from a hibernation
192 * If the restore fails after this function has been called,
193 * platform_restore_cleanup() must be called.
195 static int platform_pre_restore(int platform_mode
)
197 return (platform_mode
&& hibernation_ops
) ?
198 hibernation_ops
->pre_restore() : 0;
202 * platform_restore_cleanup - Switch to the working state after failing restore.
203 * @platform_mode: Whether or not to use the platform driver.
205 * Use the platform driver to switch the system to the normal mode of operation
206 * after a failing restore.
208 * If platform_pre_restore() has been called before the failing restore, this
209 * function must be called too, regardless of the result of
210 * platform_pre_restore().
212 static void platform_restore_cleanup(int platform_mode
)
214 if (platform_mode
&& hibernation_ops
)
215 hibernation_ops
->restore_cleanup();
219 * platform_recover - Recover from a failure to suspend devices.
220 * @platform_mode: Whether or not to use the platform driver.
222 static void platform_recover(int platform_mode
)
224 if (platform_mode
&& hibernation_ops
&& hibernation_ops
->recover
)
225 hibernation_ops
->recover();
229 * swsusp_show_speed - Print time elapsed between two events during hibernation.
230 * @start: Starting event.
231 * @stop: Final event.
232 * @nr_pages: Number of memory pages processed between @start and @stop.
233 * @msg: Additional diagnostic message to print.
235 void swsusp_show_speed(struct timeval
*start
, struct timeval
*stop
,
236 unsigned nr_pages
, char *msg
)
238 u64 elapsed_centisecs64
;
239 unsigned int centisecs
;
243 elapsed_centisecs64
= timeval_to_ns(stop
) - timeval_to_ns(start
);
245 * If "(s64)elapsed_centisecs64 < 0", it will print long elapsed time,
246 * it is obvious enough for what went wrong.
248 do_div(elapsed_centisecs64
, NSEC_PER_SEC
/ 100);
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 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
);
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 error
= platform_begin(platform_mode
);
348 /* Preallocate image memory before shutting down devices. */
349 error
= hibernate_preallocate_memory();
353 error
= freeze_kernel_threads();
357 if (hibernation_test(TEST_FREEZER
)) {
360 * Indicate to the caller that we are returning due to a
361 * successful freezer test.
363 freezer_test_done
= true;
367 error
= dpm_prepare(PMSG_FREEZE
);
369 dpm_complete(PMSG_RECOVER
);
374 pm_restrict_gfp_mask();
376 error
= dpm_suspend(PMSG_FREEZE
);
378 if (error
|| hibernation_test(TEST_DEVICES
))
379 platform_recover(platform_mode
);
381 error
= create_image(platform_mode
);
384 * In the case that we call create_image() above, the control
385 * returns here (1) after the image has been created or the
386 * image creation has failed and (2) after a successful restore.
389 /* We may need to release the preallocated image pages here. */
390 if (error
|| !in_suspend
)
393 msg
= in_suspend
? (error
? PMSG_RECOVER
: PMSG_THAW
) : PMSG_RESTORE
;
396 if (error
|| !in_suspend
)
397 pm_restore_gfp_mask();
403 platform_end(platform_mode
);
407 thaw_kernel_threads();
414 * resume_target_kernel - Restore system state from a hibernation image.
415 * @platform_mode: Whether or not to use the platform driver.
417 * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
418 * contents of highmem that have not been restored yet from the image and run
419 * the low-level code that will restore the remaining contents of memory and
420 * switch to the just restored target kernel.
422 static int resume_target_kernel(bool platform_mode
)
426 error
= dpm_suspend_end(PMSG_QUIESCE
);
428 printk(KERN_ERR
"PM: Some devices failed to power down, "
429 "aborting resume\n");
433 error
= platform_pre_restore(platform_mode
);
437 error
= disable_nonboot_cpus();
443 error
= syscore_suspend();
447 save_processor_state();
448 error
= restore_highmem();
450 error
= swsusp_arch_resume();
452 * The code below is only ever reached in case of a failure.
453 * Otherwise, execution continues at the place where
454 * swsusp_arch_suspend() was called.
458 * This call to restore_highmem() reverts the changes made by
464 * The only reason why swsusp_arch_resume() can fail is memory being
465 * very tight, so we have to free it as soon as we can to avoid
466 * subsequent failures.
469 restore_processor_state();
470 touch_softlockup_watchdog();
478 enable_nonboot_cpus();
481 platform_restore_cleanup(platform_mode
);
483 dpm_resume_start(PMSG_RECOVER
);
489 * hibernation_restore - Quiesce devices and restore from a hibernation image.
490 * @platform_mode: If set, use platform driver to prepare for the transition.
492 * This routine must be called with pm_mutex held. If it is successful, control
493 * reappears in the restored target kernel in hibernation_snapshot().
495 int hibernation_restore(int platform_mode
)
499 pm_prepare_console();
501 pm_restrict_gfp_mask();
502 error
= dpm_suspend_start(PMSG_QUIESCE
);
504 error
= resume_target_kernel(platform_mode
);
505 dpm_resume_end(PMSG_RECOVER
);
507 pm_restore_gfp_mask();
509 pm_restore_console();
514 * hibernation_platform_enter - Power off the system using the platform driver.
516 int hibernation_platform_enter(void)
520 if (!hibernation_ops
)
524 * We have cancelled the power transition by running
525 * hibernation_ops->finish() before saving the image, so we should let
526 * the firmware know that we're going to enter the sleep state after all
528 error
= hibernation_ops
->begin();
532 entering_platform_hibernation
= true;
534 error
= dpm_suspend_start(PMSG_HIBERNATE
);
536 if (hibernation_ops
->recover
)
537 hibernation_ops
->recover();
541 error
= dpm_suspend_end(PMSG_HIBERNATE
);
545 error
= hibernation_ops
->prepare();
547 goto Platform_finish
;
549 error
= disable_nonboot_cpus();
551 goto Platform_finish
;
555 if (pm_wakeup_pending()) {
560 hibernation_ops
->enter();
561 /* We should never get here */
567 enable_nonboot_cpus();
570 hibernation_ops
->finish();
572 dpm_resume_start(PMSG_RESTORE
);
575 entering_platform_hibernation
= false;
576 dpm_resume_end(PMSG_RESTORE
);
580 hibernation_ops
->end();
586 * power_down - Shut the machine down for hibernation.
588 * Use the platform driver, if configured, to put the system into the sleep
589 * state corresponding to hibernation, or try to power it off or reboot,
590 * depending on the value of hibernation_mode.
592 static void power_down(void)
594 #ifdef CONFIG_SUSPEND
598 switch (hibernation_mode
) {
599 case HIBERNATION_REBOOT
:
600 kernel_restart(NULL
);
602 case HIBERNATION_PLATFORM
:
603 hibernation_platform_enter();
604 case HIBERNATION_SHUTDOWN
:
608 #ifdef CONFIG_SUSPEND
609 case HIBERNATION_SUSPEND
:
610 error
= suspend_devices_and_enter(PM_SUSPEND_MEM
);
613 hibernation_mode
= HIBERNATION_PLATFORM
;
615 hibernation_mode
= HIBERNATION_SHUTDOWN
;
619 * Restore swap signature.
621 error
= swsusp_unmark();
623 printk(KERN_ERR
"PM: Swap will be unusable! "
630 * Valid image is on the disk, if we continue we risk serious data
631 * corruption after resume.
633 printk(KERN_CRIT
"PM: Please power down manually\n");
639 * hibernate - Carry out system hibernation, including saving the image.
645 if (!hibernation_available()) {
646 pr_debug("PM: Hibernation not available.\n");
651 /* The snapshot device should not be opened while we're running */
652 if (!atomic_add_unless(&snapshot_device_available
, -1, 0)) {
657 pm_prepare_console();
658 error
= pm_notifier_call_chain(PM_HIBERNATION_PREPARE
);
662 printk(KERN_INFO
"PM: Syncing filesystems ... ");
666 error
= freeze_processes();
670 lock_device_hotplug();
671 /* Allocate memory management structures */
672 error
= create_basic_memory_bitmaps();
676 error
= hibernation_snapshot(hibernation_mode
== HIBERNATION_PLATFORM
);
677 if (error
|| freezer_test_done
)
681 unsigned int flags
= 0;
683 if (hibernation_mode
== HIBERNATION_PLATFORM
)
684 flags
|= SF_PLATFORM_MODE
;
686 flags
|= SF_NOCOMPRESS_MODE
;
688 flags
|= SF_CRC32_MODE
;
690 pr_debug("PM: writing image.\n");
691 error
= swsusp_write(flags
);
696 pm_restore_gfp_mask();
698 pr_debug("PM: Image restored successfully.\n");
702 free_basic_memory_bitmaps();
704 unlock_device_hotplug();
707 /* Don't bother checking whether freezer_test_done is true */
708 freezer_test_done
= false;
710 pm_notifier_call_chain(PM_POST_HIBERNATION
);
711 pm_restore_console();
712 atomic_inc(&snapshot_device_available
);
714 unlock_system_sleep();
720 * software_resume - Resume from a saved hibernation image.
722 * This routine is called as a late initcall, when all devices have been
723 * discovered and initialized already.
725 * The image reading code is called to see if there is a hibernation image
726 * available for reading. If that is the case, devices are quiesced and the
727 * contents of memory is restored from the saved image.
729 * If this is successful, control reappears in the restored target kernel in
730 * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine
731 * attempts to recover gracefully and make the kernel return to the normal mode
734 static int software_resume(void)
740 * If the user said "noresume".. bail out early.
742 if (noresume
|| !hibernation_available())
746 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
747 * is configured into the kernel. Since the regular hibernate
748 * trigger path is via sysfs which takes a buffer mutex before
749 * calling hibernate functions (which take pm_mutex) this can
750 * cause lockdep to complain about a possible ABBA deadlock
751 * which cannot happen since we're in the boot code here and
752 * sysfs can't be invoked yet. Therefore, we use a subclass
753 * here to avoid lockdep complaining.
755 mutex_lock_nested(&pm_mutex
, SINGLE_DEPTH_NESTING
);
757 if (swsusp_resume_device
)
760 if (!strlen(resume_file
)) {
765 pr_debug("PM: Checking hibernation image partition %s\n", resume_file
);
768 printk(KERN_INFO
"Waiting %dsec before reading resume device...\n",
770 ssleep(resume_delay
);
773 /* Check if the device is there */
774 swsusp_resume_device
= name_to_dev_t(resume_file
);
777 * name_to_dev_t is ineffective to verify parition if resume_file is in
778 * integer format. (e.g. major:minor)
780 if (isdigit(resume_file
[0]) && resume_wait
) {
782 while (!get_gendisk(swsusp_resume_device
, &partno
))
786 if (!swsusp_resume_device
) {
788 * Some device discovery might still be in progress; we need
789 * to wait for this to finish.
791 wait_for_device_probe();
794 while ((swsusp_resume_device
= name_to_dev_t(resume_file
)) == 0)
796 async_synchronize_full();
799 swsusp_resume_device
= name_to_dev_t(resume_file
);
800 if (!swsusp_resume_device
) {
807 pr_debug("PM: Hibernation image partition %d:%d present\n",
808 MAJOR(swsusp_resume_device
), MINOR(swsusp_resume_device
));
810 pr_debug("PM: Looking for hibernation image.\n");
811 error
= swsusp_check();
815 /* The snapshot device should not be opened while we're running */
816 if (!atomic_add_unless(&snapshot_device_available
, -1, 0)) {
818 swsusp_close(FMODE_READ
);
822 pm_prepare_console();
823 error
= pm_notifier_call_chain(PM_RESTORE_PREPARE
);
827 pr_debug("PM: Preparing processes for restore.\n");
828 error
= freeze_processes();
832 pr_debug("PM: Loading hibernation image.\n");
834 lock_device_hotplug();
835 error
= create_basic_memory_bitmaps();
839 error
= swsusp_read(&flags
);
840 swsusp_close(FMODE_READ
);
842 hibernation_restore(flags
& SF_PLATFORM_MODE
);
844 printk(KERN_ERR
"PM: Failed to load hibernation image, recovering.\n");
846 free_basic_memory_bitmaps();
848 unlock_device_hotplug();
851 pm_notifier_call_chain(PM_POST_RESTORE
);
852 pm_restore_console();
853 atomic_inc(&snapshot_device_available
);
854 /* For success case, the suspend path will release the lock */
856 mutex_unlock(&pm_mutex
);
857 pr_debug("PM: Hibernation image not present or could not be loaded.\n");
860 swsusp_close(FMODE_READ
);
864 late_initcall_sync(software_resume
);
867 static const char * const hibernation_modes
[] = {
868 [HIBERNATION_PLATFORM
] = "platform",
869 [HIBERNATION_SHUTDOWN
] = "shutdown",
870 [HIBERNATION_REBOOT
] = "reboot",
871 #ifdef CONFIG_SUSPEND
872 [HIBERNATION_SUSPEND
] = "suspend",
877 * /sys/power/disk - Control hibernation mode.
879 * Hibernation can be handled in several ways. There are a few different ways
880 * to put the system into the sleep state: using the platform driver (e.g. ACPI
881 * or other hibernation_ops), powering it off or rebooting it (for testing
884 * The sysfs file /sys/power/disk provides an interface for selecting the
885 * hibernation mode to use. Reading from this file causes the available modes
886 * to be printed. There are 3 modes that can be supported:
892 * If a platform hibernation driver is in use, 'platform' will be supported
893 * and will be used by default. Otherwise, 'shutdown' will be used by default.
894 * The selected option (i.e. the one corresponding to the current value of
895 * hibernation_mode) is enclosed by a square bracket.
897 * To select a given hibernation mode it is necessary to write the mode's
898 * string representation (as returned by reading from /sys/power/disk) back
899 * into /sys/power/disk.
902 static ssize_t
disk_show(struct kobject
*kobj
, struct kobj_attribute
*attr
,
908 if (!hibernation_available())
909 return sprintf(buf
, "[disabled]\n");
911 for (i
= HIBERNATION_FIRST
; i
<= HIBERNATION_MAX
; i
++) {
912 if (!hibernation_modes
[i
])
915 case HIBERNATION_SHUTDOWN
:
916 case HIBERNATION_REBOOT
:
917 #ifdef CONFIG_SUSPEND
918 case HIBERNATION_SUSPEND
:
921 case HIBERNATION_PLATFORM
:
924 /* not a valid mode, continue with loop */
927 if (i
== hibernation_mode
)
928 buf
+= sprintf(buf
, "[%s] ", hibernation_modes
[i
]);
930 buf
+= sprintf(buf
, "%s ", hibernation_modes
[i
]);
932 buf
+= sprintf(buf
, "\n");
936 static ssize_t
disk_store(struct kobject
*kobj
, struct kobj_attribute
*attr
,
937 const char *buf
, size_t n
)
943 int mode
= HIBERNATION_INVALID
;
945 if (!hibernation_available())
948 p
= memchr(buf
, '\n', n
);
949 len
= p
? p
- buf
: n
;
952 for (i
= HIBERNATION_FIRST
; i
<= HIBERNATION_MAX
; i
++) {
953 if (len
== strlen(hibernation_modes
[i
])
954 && !strncmp(buf
, hibernation_modes
[i
], len
)) {
959 if (mode
!= HIBERNATION_INVALID
) {
961 case HIBERNATION_SHUTDOWN
:
962 case HIBERNATION_REBOOT
:
963 #ifdef CONFIG_SUSPEND
964 case HIBERNATION_SUSPEND
:
966 hibernation_mode
= mode
;
968 case HIBERNATION_PLATFORM
:
970 hibernation_mode
= mode
;
978 pr_debug("PM: Hibernation mode set to '%s'\n",
979 hibernation_modes
[mode
]);
980 unlock_system_sleep();
981 return error
? error
: n
;
986 static ssize_t
resume_show(struct kobject
*kobj
, struct kobj_attribute
*attr
,
989 return sprintf(buf
,"%d:%d\n", MAJOR(swsusp_resume_device
),
990 MINOR(swsusp_resume_device
));
993 static ssize_t
resume_store(struct kobject
*kobj
, struct kobj_attribute
*attr
,
994 const char *buf
, size_t n
)
1000 if (len
&& buf
[len
-1] == '\n')
1002 name
= kstrndup(buf
, len
, GFP_KERNEL
);
1006 res
= name_to_dev_t(name
);
1011 lock_system_sleep();
1012 swsusp_resume_device
= res
;
1013 unlock_system_sleep();
1014 printk(KERN_INFO
"PM: Starting manual resume from disk\n");
1022 static ssize_t
image_size_show(struct kobject
*kobj
, struct kobj_attribute
*attr
,
1025 return sprintf(buf
, "%lu\n", image_size
);
1028 static ssize_t
image_size_store(struct kobject
*kobj
, struct kobj_attribute
*attr
,
1029 const char *buf
, size_t n
)
1033 if (sscanf(buf
, "%lu", &size
) == 1) {
1041 power_attr(image_size
);
1043 static ssize_t
reserved_size_show(struct kobject
*kobj
,
1044 struct kobj_attribute
*attr
, char *buf
)
1046 return sprintf(buf
, "%lu\n", reserved_size
);
1049 static ssize_t
reserved_size_store(struct kobject
*kobj
,
1050 struct kobj_attribute
*attr
,
1051 const char *buf
, size_t n
)
1055 if (sscanf(buf
, "%lu", &size
) == 1) {
1056 reserved_size
= size
;
1063 power_attr(reserved_size
);
1065 static struct attribute
* g
[] = {
1068 &image_size_attr
.attr
,
1069 &reserved_size_attr
.attr
,
1074 static struct attribute_group attr_group
= {
1079 static int __init
pm_disk_init(void)
1081 return sysfs_create_group(power_kobj
, &attr_group
);
1084 core_initcall(pm_disk_init
);
1087 static int __init
resume_setup(char *str
)
1092 strncpy( resume_file
, str
, 255 );
1096 static int __init
resume_offset_setup(char *str
)
1098 unsigned long long offset
;
1103 if (sscanf(str
, "%llu", &offset
) == 1)
1104 swsusp_resume_block
= offset
;
1109 static int __init
hibernate_setup(char *str
)
1111 if (!strncmp(str
, "noresume", 8))
1113 else if (!strncmp(str
, "nocompress", 10))
1115 else if (!strncmp(str
, "no", 2)) {
1122 static int __init
noresume_setup(char *str
)
1128 static int __init
resumewait_setup(char *str
)
1134 static int __init
resumedelay_setup(char *str
)
1136 int rc
= kstrtouint(str
, 0, &resume_delay
);
1143 static int __init
nohibernate_setup(char *str
)
1150 static int __init
kaslr_nohibernate_setup(char *str
)
1152 return nohibernate_setup(str
);
1155 __setup("noresume", noresume_setup
);
1156 __setup("resume_offset=", resume_offset_setup
);
1157 __setup("resume=", resume_setup
);
1158 __setup("hibernate=", hibernate_setup
);
1159 __setup("resumewait", resumewait_setup
);
1160 __setup("resumedelay=", resumedelay_setup
);
1161 __setup("nohibernate", nohibernate_setup
);
1162 __setup("kaslr", kaslr_nohibernate_setup
);