summaryrefslogtreecommitdiff
path: root/include/linux/suspend.h
blob: 5785d909c32150e113bfacb15d83f9b4ef170232 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SUSPEND_H
#define _LINUX_SUSPEND_H

#include <linux/swap.h>
#include <linux/notifier.h>
#include <linux/init.h>
#include <linux/pm.h>
#include <linux/mm.h>
#include <linux/freezer.h>
#include <asm/errno.h>

#ifdef CONFIG_VT
extern void pm_set_vt_switch(int);
#else
static inline void pm_set_vt_switch(int do_switch)
{
}
#endif

#ifdef CONFIG_VT_CONSOLE_SLEEP
extern void pm_prepare_console(void);
extern void pm_restore_console(void);
#else
static inline void pm_prepare_console(void)
{
}

static inline void pm_restore_console(void)
{
}
#endif

typedef int __bitwise suspend_state_t;

#define PM_SUSPEND_ON		((__force suspend_state_t) 0)
#define PM_SUSPEND_TO_IDLE	((__force suspend_state_t) 1)
#define PM_SUSPEND_STANDBY	((__force suspend_state_t) 2)
#define PM_SUSPEND_MEM		((__force suspend_state_t) 3)
#define PM_SUSPEND_MIN		PM_SUSPEND_TO_IDLE
#define PM_SUSPEND_MAX		((__force suspend_state_t) 4)

enum suspend_stat_step {
	SUSPEND_FREEZE = 1,
	SUSPEND_PREPARE,
	SUSPEND_SUSPEND,
	SUSPEND_SUSPEND_LATE,
	SUSPEND_SUSPEND_NOIRQ,
	SUSPEND_RESUME_NOIRQ,
	SUSPEND_RESUME_EARLY,
	SUSPEND_RESUME
};

struct suspend_stats {
	int	success;
	int	fail;
	int	failed_freeze;
	int	failed_prepare;
	int	failed_suspend;
	int	failed_suspend_late;
	int	failed_suspend_noirq;
	int	failed_resume;
	int	failed_resume_early;
	int	failed_resume_noirq;
#define	REC_FAILED_NUM	2
	int	last_failed_dev;
	char	failed_devs[REC_FAILED_NUM][40];
	int	last_failed_errno;
	int	errno[REC_FAILED_NUM];
	int	last_failed_step;
	enum suspend_stat_step	failed_steps[REC_FAILED_NUM];
};

extern struct suspend_stats suspend_stats;

static inline void dpm_save_failed_dev(const char *name)
{
	strlcpy(suspend_stats.failed_devs[suspend_stats.last_failed_dev],
		name,
		sizeof(suspend_stats.failed_devs[0]));
	suspend_stats.last_failed_dev++;
	suspend_stats.last_failed_dev %= REC_FAILED_NUM;
}

static inline void dpm_save_failed_errno(int err)
{
	suspend_stats.errno[suspend_stats.last_failed_errno] = err;
	suspend_stats.last_failed_errno++;
	suspend_stats.last_failed_errno %= REC_FAILED_NUM;
}

static inline void dpm_save_failed_step(enum suspend_stat_step step)
{
	suspend_stats.failed_steps[suspend_stats.last_failed_step] = step;
	suspend_stats.last_failed_step++;
	suspend_stats.last_failed_step %= REC_FAILED_NUM;
}

/**
 * struct platform_suspend_ops - Callbacks for managing platform dependent
 *	system sleep states.
 *
 * @valid: Callback to determine if given system sleep state is supported by
 *	the platform.
 *	Valid (ie. supported) states are advertised in /sys/power/state.  Note
 *	that it still may be impossible to enter given system sleep state if the
 *	conditions aren't right.
 *	There is the %suspend_valid_only_mem function available that can be
 *	assigned to this if the platform only supports mem sleep.
 *
 * @begin: Initialise a transition to given system sleep state.
 *	@begin() is executed right prior to suspending devices.  The information
 *	conveyed to the platform code by @begin() should be disregarded by it as
 *	soon as @end() is executed.  If @begin() fails (ie. returns nonzero),
 *	@prepare(), @enter() and @finish() will not be called by the PM core.
 *	This callback is optional.  However, if it is implemented, the argument
 *	passed to @enter() is redundant and should be ignored.
 *
 * @prepare: Prepare the platform for entering the system sleep state indicated
 *	by @begin().
 *	@prepare() is called right after devices have been suspended (ie. the
 *	appropriate .suspend() method has been executed for each device) and
 *	before device drivers' late suspend callbacks are executed.  It returns
 *	0 on success or a negative error code otherwise, in which case the
 *	system cannot enter the desired sleep state (@prepare_late(), @enter(),
 *	and @wake() will not be called in that case).
 *
 * @prepare_late: Finish preparing the platform for entering the system sleep
 *	state indicated by @begin().
 *	@prepare_late is called before disabling nonboot CPUs and after
 *	device drivers' late suspend callbacks have been executed.  It returns
 *	0 on success or a negative error code otherwise, in which case the
 *	system cannot enter the desired sleep state (@enter() will not be
 *	executed).
 *
 * @enter: Enter the system sleep state indicated by @begin() or represented by
 *	the argument if @begin() is not implemented.
 *	This callback is mandatory.  It returns 0 on success or a negative
 *	error code otherwise, in which case the system cannot enter the desired
 *	sleep state.
 *
 * @wake: Called when the system has just left a sleep state, right after
 *	the nonboot CPUs have been enabled and before device drivers' early
 *	resume callbacks are executed.
 *	This callback is optional, but should be implemented by the platforms
 *	that implement @prepare_late().  If implemented, it is always called
 *	after @prepare_late and @enter(), even if one of them fails.
 *
 * @finish: Finish wake-up of the platform.
 *	@finish is called right prior to calling device drivers' regular suspend
 *	callbacks.
 *	This callback is optional, but should be implemented by the platforms
 *	that implement @prepare().  If implemented, it is always called after
 *	@enter() and @wake(), even if any of them fails.  It is executed after
 *	a failing @prepare.
 *
 * @suspend_again: Returns whether the system should suspend again (true) or
 *	not (false). If the platform wants to poll sensors or execute some
 *	code during suspended without invoking userspace and most of devices,
 *	suspend_again callback is the place assuming that periodic-wakeup or
 *	alarm-wakeup is already setup. This allows to execute some codes while
 *	being kept suspended in the view of userland and devices.
 *
 * @end: Called by the PM core right after resuming devices, to indicate to
 *	the platform that the system has returned to the working state or
 *	the transition to the sleep state has been aborted.
 *	This callback is optional, but should be implemented by the platforms
 *	that implement @begin().  Accordingly, platforms implementing @begin()
 *	should also provide a @end() which cleans up transitions aborted before
 *	@enter().
 *
 * @recover: Recover the platform from a suspend failure.
 *	Called by the PM core if the suspending of devices fails.
 *	This callback is optional and should only be implemented by platforms
 *	which require special recovery actions in that situation.
 */
struct platform_suspend_ops {
	int (*valid)(suspend_state_t state);
	int (*begin)(suspend_state_t state);
	int (*prepare)(void);
	int (*prepare_late)(void);
	int (*enter)(suspend_state_t state);
	void (*wake)(void);
	void (*finish)(void);
	bool (*suspend_again)(void);
	void (*end)(void);
	void (*recover)(void);
};

struct platform_s2idle_ops {
	int (*begin)(void);
	int (*prepare)(void);
	int (*prepare_late)(void);
	bool (*wake)(void);
	void (*restore_early)(void);
	void (*restore)(void);
	void (*end)(void);
};

#ifdef CONFIG_SUSPEND
extern suspend_state_t mem_sleep_current;
extern suspend_state_t mem_sleep_default;

/**
 * suspend_set_ops - set platform dependent suspend operations
 * @ops: The new suspend operations to set.
 */
extern void suspend_set_ops(const struct platform_suspend_ops *ops);
extern int suspend_valid_only_mem(suspend_state_t state);

extern unsigned int pm_suspend_global_flags;

#define PM_SUSPEND_FLAG_FW_SUSPEND	BIT(0)
#define PM_SUSPEND_FLAG_FW_RESUME	BIT(1)
#define PM_SUSPEND_FLAG_NO_PLATFORM	BIT(2)

static inline void pm_suspend_clear_flags(void)
{
	pm_suspend_global_flags = 0;
}

static inline void pm_set_suspend_via_firmware(void)
{
	pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_SUSPEND;
}

static inline void pm_set_resume_via_firmware(void)
{
	pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_RESUME;
}

static inline void pm_set_suspend_no_platform(void)
{
	pm_suspend_global_flags |= PM_SUSPEND_FLAG_NO_PLATFORM;
}

/**
 * pm_suspend_via_firmware - Check if platform firmware will suspend the system.
 *
 * To be called during system-wide power management transitions to sleep states
 * or during the subsequent system-wide transitions back to the working state.
 *
 * Return 'true' if the platform firmware is going to be invoked at the end of
 * the system-wide power management transition (to a sleep state) in progress in
 * order to complete it, or if the platform firmware has been invoked in order
 * to complete the last (or preceding) transition of the system to a sleep
 * state.
 *
 * This matters if the caller needs or wants to carry out some special actions
 * depending on whether or not control will be passed to the platform firmware
 * subsequently (for example, the device may need to be reset before letting the
 * platform firmware manipulate it, which is not necessary when the platform
 * firmware is not going to be invoked) or when such special actions may have
 * been carried out during the preceding transition of the system to a sleep
 * state (as they may need to be taken into account).
 */
static inline bool pm_suspend_via_firmware(void)
{
	return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_SUSPEND);
}

/**
 * pm_resume_via_firmware - Check if platform firmware has woken up the system.
 *
 * To be called during system-wide power management transitions from sleep
 * states.
 *
 * Return 'true' if the platform firmware has passed control to the kernel at
 * the beginning of the system-wide power management transition in progress, so
 * the event that woke up the system from sleep has been handled by the platform
 * firmware.
 */
static inline bool pm_resume_via_firmware(void)
{
	return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_RESUME);
}

/**
 * pm_suspend_no_platform - Check if platform may change device power states.
 *
 * To be called during system-wide power management transitions to sleep states
 * or during the subsequent system-wide transitions back to the working state.
 *
 * Return 'true' if the power states of devices remain under full control of the
 * kernel throughout the system-wide suspend and resume cycle in progress (that
 * is, if a device is put into a certain power state during suspend, it can be
 * expected to remain in that state during resume).
 */
static inline bool pm_suspend_no_platform(void)
{
	return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_NO_PLATFORM);
}

/* Suspend-to-idle state machnine. */
enum s2idle_states {
	S2IDLE_STATE_NONE,      /* Not suspended/suspending. */
	S2IDLE_STATE_ENTER,     /* Enter suspend-to-idle. */
	S2IDLE_STATE_WAKE,      /* Wake up from suspend-to-idle. */
};

extern enum s2idle_states __read_mostly s2idle_state;

static inline bool idle_should_enter_s2idle(void)
{
	return unlikely(s2idle_state == S2IDLE_STATE_ENTER);
}

extern bool pm_suspend_default_s2idle(void);
extern void __init pm_states_init(void);
extern void s2idle_set_ops(const struct platform_s2idle_ops *ops);
extern void s2idle_wake(void);

/**
 * arch_suspend_disable_irqs - disable IRQs for suspend
 *
 * Disables IRQs (in the default case). This is a weak symbol in the common
 * code and thus allows architectures to override it if more needs to be
 * done. Not called for suspend to disk.
 */
extern void arch_suspend_disable_irqs(void);

/**
 * arch_suspend_enable_irqs - enable IRQs after suspend
 *
 * Enables IRQs (in the default case). This is a weak symbol in the common
 * code and thus allows architectures to override it if more needs to be
 * done. Not called for suspend to disk.
 */
extern void arch_suspend_enable_irqs(void);

extern int pm_suspend(suspend_state_t state);
extern bool sync_on_suspend_enabled;
#else /* !CONFIG_SUSPEND */
#define suspend_valid_only_mem	NULL

static inline void pm_suspend_clear_flags(void) {}
static inline void pm_set_suspend_via_firmware(void) {}
static inline void pm_set_resume_via_firmware(void) {}
static inline bool pm_suspend_via_firmware(void) { return false; }
static inline bool pm_resume_via_firmware(void) { return false; }
static inline bool pm_suspend_no_platform(void) { return false; }
static inline bool pm_suspend_default_s2idle(void) { return false; }

static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {}
static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
static inline bool sync_on_suspend_enabled(void) { return true; }
static inline bool idle_should_enter_s2idle(void) { return false; }
static inline void __init pm_states_init(void) {}
static inline void s2idle_set_ops(const struct platform_s2idle_ops *ops) {}
static inline void s2idle_wake(void) {}
#endif /* !CONFIG_SUSPEND */

/* struct pbe is used for creating lists of pages that should be restored
 * atomically during the resume from disk, because the page frames they have
 * occupied before the suspend are in use.
 */
struct pbe {
	void *address;		/* address of the copy */
	void *orig_address;	/* original address of a page */
	struct pbe *next;
};

/* mm/page_alloc.c */
extern void mark_free_pages(struct zone *zone);

/**
 * struct platform_hibernation_ops - hibernation platform support
 *
 * The methods in this structure allow a platform to carry out special
 * operations required by it during a hibernation transition.
 *
 * All the methods below, except for @recover(), must be implemented.
 *
 * @begin: Tell the platform driver that we're starting hibernation.
 *	Called right after shrinking memory and before freezing devices.
 *
 * @end: Called by the PM core right after resuming devices, to indicate to
 *	the platform that the system has returned to the working state.
 *
 * @pre_snapshot: Prepare the platform for creating the hibernation image.
 *	Called right after devices have been frozen and before the nonboot
 *	CPUs are disabled (runs with IRQs on).
 *
 * @finish: Restore the previous state of the platform after the hibernation
 *	image has been created *or* put the platform into the normal operation
 *	mode after the hibernation (the same method is executed in both cases).
 *	Called right after the nonboot CPUs have been enabled and before
 *	thawing devices (runs with IRQs on).
 *
 * @prepare: Prepare the platform for entering the low power state.
 *	Called right after the hibernation image has been saved and before
 *	devices are prepared for entering the low power state.
 *
 * @enter: Put the system into the low power state after the hibernation image
 *	has been saved to disk.
 *	Called after the nonboot CPUs have been disabled and all of the low
 *	level devices have been shut down (runs with IRQs off).
 *
 * @leave: Perform the first stage of the cleanup after the system sleep state
 *	indicated by @set_target() has been left.
 *	Called right after the control has been passed from the boot kernel to
 *	the image kernel, before the nonboot CPUs are enabled and before devices
 *	are resumed.  Executed with interrupts disabled.
 *
 * @pre_restore: Prepare system for the restoration from a hibernation image.
 *	Called right after devices have been frozen and before the nonboot
 *	CPUs are disabled (runs with IRQs on).
 *
 * @restore_cleanup: Clean up after a failing image restoration.
 *	Called right after the nonboot CPUs have been enabled and before
 *	thawing devices (runs with IRQs on).
 *
 * @recover: Recover the platform from a failure to suspend devices.
 *	Called by the PM core if the suspending of devices during hibernation
 *	fails.  This callback is optional and should only be implemented by
 *	platforms which require special recovery actions in that situation.
 */
struct platform_hibernation_ops {
	int (*begin)(pm_message_t stage);
	void (*end)(void);
	int (*pre_snapshot)(void);
	void (*finish)(void);
	int (*prepare)(void);
	int (*enter)(void);
	void (*leave)(void);
	int (*pre_restore)(void);
	void (*restore_cleanup)(void);
	void (*recover)(void);
};

#ifdef CONFIG_HIBERNATION
/* kernel/power/snapshot.c */
extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
static inline void __init register_nosave_region(unsigned long b, unsigned long e)
{
	__register_nosave_region(b, e, 0);
}
static inline void __init register_nosave_region_late(unsigned long b, unsigned long e)
{
	__register_nosave_region(b, e, 1);
}
extern int swsusp_page_is_forbidden(struct page *);
extern void swsusp_set_page_free(struct page *);
extern void swsusp_unset_page_free(struct page *);
extern unsigned long get_safe_page(gfp_t gfp_mask);
extern asmlinkage int swsusp_arch_suspend(void);
extern asmlinkage int swsusp_arch_resume(void);

extern u32 swsusp_hardware_signature;
extern void hibernation_set_ops(const struct platform_hibernation_ops *ops);
extern int hibernate(void);
extern bool system_entering_hibernation(void);
extern bool hibernation_available(void);
asmlinkage int swsusp_save(void);
extern struct pbe *restore_pblist;
int pfn_is_nosave(unsigned long pfn);

int hibernate_quiet_exec(int (*func)(void *data), void *data);
#else /* CONFIG_HIBERNATION */
static inline void register_nosave_region(unsigned long b, unsigned long e) {}
static inline void register_nosave_region_late(unsigned long b, unsigned long e) {}
static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
static inline void swsusp_set_page_free(struct page *p) {}
static inline void swsusp_unset_page_free(struct page *p) {}

static inline void hibernation_set_ops(const struct platform_hibernation_ops *ops) {}
static inline int hibernate(void) { return -ENOSYS; }
static inline bool system_entering_hibernation(void) { return false; }
static inline bool hibernation_available(void) { return false; }

static inline int hibernate_quiet_exec(int (*func)(void *data), void *data) {
	return -ENOTSUPP;
}
#endif /* CONFIG_HIBERNATION */

#ifdef CONFIG_HIBERNATION_SNAPSHOT_DEV
int is_hibernate_resume_dev(dev_t dev);
#else
static inline int is_hibernate_resume_dev(dev_t dev) { return 0; }
#endif

/* Hibernation and suspend events */
#define PM_HIBERNATION_PREPARE	0x0001 /* Going to hibernate */
#define PM_POST_HIBERNATION	0x0002 /* Hibernation finished */
#define PM_SUSPEND_PREPARE	0x0003 /* Going to suspend the system */
#define PM_POST_SUSPEND		0x0004 /* Suspend finished */
#define PM_RESTORE_PREPARE	0x0005 /* Going to restore a saved image */
#define PM_POST_RESTORE		0x0006 /* Restore failed */

extern struct mutex system_transition_mutex;

#ifdef CONFIG_PM_SLEEP
void save_processor_state(void);
void restore_processor_state(void);

/* kernel/power/main.c */
extern int register_pm_notifier(struct notifier_block *nb);
extern int unregister_pm_notifier(struct notifier_block *nb);
extern void ksys_sync_helper(void);

#define pm_notifier(fn, pri) {				\
	static struct notifier_block fn##_nb =			\
		{ .notifier_call = fn, .priority = pri };	\
	register_pm_notifier(&fn##_nb);			\
}

/* drivers/base/power/wakeup.c */
extern bool events_check_enabled;
extern unsigned int pm_wakeup_irq;
extern suspend_state_t pm_suspend_target_state;

extern bool pm_wakeup_pending(void);
extern void pm_system_wakeup(void);
extern void pm_system_cancel_wakeup(void);
extern void pm_wakeup_clear(bool reset);
extern void pm_system_irq_wakeup(unsigned int irq_number);
extern bool pm_get_wakeup_count(unsigned int *count, bool block);
extern bool pm_save_wakeup_count(unsigned int count);
extern void pm_wakep_autosleep_enabled(bool set);
extern void pm_print_active_wakeup_sources(void);

extern void lock_system_sleep(void);
extern void unlock_system_sleep(void);

#else /* !CONFIG_PM_SLEEP */

static inline int register_pm_notifier(struct notifier_block *nb)
{
	return 0;
}

static inline int unregister_pm_notifier(struct notifier_block *nb)
{
	return 0;
}

static inline void ksys_sync_helper(void) {}

#define pm_notifier(fn, pri)	do { (void)(fn); } while (0)

static inline bool pm_wakeup_pending(void) { return false; }
static inline void pm_system_wakeup(void) {}
static inline void pm_wakeup_clear(bool reset) {}
static inline void pm_system_irq_wakeup(unsigned int irq_number) {}

static inline void lock_system_sleep(void) {}
static inline void unlock_system_sleep(void) {}

#endif /* !CONFIG_PM_SLEEP */

#ifdef CONFIG_PM_SLEEP_DEBUG
extern bool pm_print_times_enabled;
extern bool pm_debug_messages_on;
extern __printf(2, 3) void __pm_pr_dbg(bool defer, const char *fmt, ...);
#else
#define pm_print_times_enabled	(false)
#define pm_debug_messages_on	(false)

#include <linux/printk.h>

#define __pm_pr_dbg(defer, fmt, ...) \
	no_printk(KERN_DEBUG fmt, ##__VA_ARGS__)
#endif

#define pm_pr_dbg(fmt, ...) \
	__pm_pr_dbg(false, fmt, ##__VA_ARGS__)

#define pm_deferred_pr_dbg(fmt, ...) \
	__pm_pr_dbg(true, fmt, ##__VA_ARGS__)

#ifdef CONFIG_PM_AUTOSLEEP

/* kernel/power/autosleep.c */
void queue_up_suspend_work(void);

#else /* !CONFIG_PM_AUTOSLEEP */

static inline void queue_up_suspend_work(void) {}

#endif /* !CONFIG_PM_AUTOSLEEP */

#endif /* _LINUX_SUSPEND_H */