1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_SUSPEND_H
3 #define _LINUX_SUSPEND_H
4 
5 #include <linux/swap.h>
6 #include <linux/notifier.h>
7 #include <linux/init.h>
8 #include <linux/pm.h>
9 #include <linux/mm.h>
10 #include <linux/freezer.h>
11 #include <asm/errno.h>
12 
13 #ifdef CONFIG_VT
14 extern void pm_set_vt_switch(int);
15 #else
pm_set_vt_switch(int do_switch)16 static inline void pm_set_vt_switch(int do_switch)
17 {
18 }
19 #endif
20 
21 #ifdef CONFIG_VT_CONSOLE_SLEEP
22 extern void pm_prepare_console(void);
23 extern void pm_restore_console(void);
24 #else
pm_prepare_console(void)25 static inline void pm_prepare_console(void)
26 {
27 }
28 
pm_restore_console(void)29 static inline void pm_restore_console(void)
30 {
31 }
32 #endif
33 
34 typedef int __bitwise suspend_state_t;
35 
36 #define PM_SUSPEND_ON		((__force suspend_state_t) 0)
37 #define PM_SUSPEND_TO_IDLE	((__force suspend_state_t) 1)
38 #define PM_SUSPEND_STANDBY	((__force suspend_state_t) 2)
39 #define PM_SUSPEND_MEM		((__force suspend_state_t) 3)
40 #define PM_SUSPEND_MIN		PM_SUSPEND_TO_IDLE
41 #define PM_SUSPEND_MAX		((__force suspend_state_t) 4)
42 
43 enum suspend_stat_step {
44 	SUSPEND_FREEZE = 1,
45 	SUSPEND_PREPARE,
46 	SUSPEND_SUSPEND,
47 	SUSPEND_SUSPEND_LATE,
48 	SUSPEND_SUSPEND_NOIRQ,
49 	SUSPEND_RESUME_NOIRQ,
50 	SUSPEND_RESUME_EARLY,
51 	SUSPEND_RESUME
52 };
53 
54 struct suspend_stats {
55 	int	success;
56 	int	fail;
57 	int	failed_freeze;
58 	int	failed_prepare;
59 	int	failed_suspend;
60 	int	failed_suspend_late;
61 	int	failed_suspend_noirq;
62 	int	failed_resume;
63 	int	failed_resume_early;
64 	int	failed_resume_noirq;
65 #define	REC_FAILED_NUM	2
66 	int	last_failed_dev;
67 	char	failed_devs[REC_FAILED_NUM][40];
68 	int	last_failed_errno;
69 	int	errno[REC_FAILED_NUM];
70 	int	last_failed_step;
71 	enum suspend_stat_step	failed_steps[REC_FAILED_NUM];
72 };
73 
74 extern struct suspend_stats suspend_stats;
75 
dpm_save_failed_dev(const char * name)76 static inline void dpm_save_failed_dev(const char *name)
77 {
78 	strlcpy(suspend_stats.failed_devs[suspend_stats.last_failed_dev],
79 		name,
80 		sizeof(suspend_stats.failed_devs[0]));
81 	suspend_stats.last_failed_dev++;
82 	suspend_stats.last_failed_dev %= REC_FAILED_NUM;
83 }
84 
dpm_save_failed_errno(int err)85 static inline void dpm_save_failed_errno(int err)
86 {
87 	suspend_stats.errno[suspend_stats.last_failed_errno] = err;
88 	suspend_stats.last_failed_errno++;
89 	suspend_stats.last_failed_errno %= REC_FAILED_NUM;
90 }
91 
dpm_save_failed_step(enum suspend_stat_step step)92 static inline void dpm_save_failed_step(enum suspend_stat_step step)
93 {
94 	suspend_stats.failed_steps[suspend_stats.last_failed_step] = step;
95 	suspend_stats.last_failed_step++;
96 	suspend_stats.last_failed_step %= REC_FAILED_NUM;
97 }
98 
99 /**
100  * struct platform_suspend_ops - Callbacks for managing platform dependent
101  *	system sleep states.
102  *
103  * @valid: Callback to determine if given system sleep state is supported by
104  *	the platform.
105  *	Valid (ie. supported) states are advertised in /sys/power/state.  Note
106  *	that it still may be impossible to enter given system sleep state if the
107  *	conditions aren't right.
108  *	There is the %suspend_valid_only_mem function available that can be
109  *	assigned to this if the platform only supports mem sleep.
110  *
111  * @begin: Initialise a transition to given system sleep state.
112  *	@begin() is executed right prior to suspending devices.  The information
113  *	conveyed to the platform code by @begin() should be disregarded by it as
114  *	soon as @end() is executed.  If @begin() fails (ie. returns nonzero),
115  *	@prepare(), @enter() and @finish() will not be called by the PM core.
116  *	This callback is optional.  However, if it is implemented, the argument
117  *	passed to @enter() is redundant and should be ignored.
118  *
119  * @prepare: Prepare the platform for entering the system sleep state indicated
120  *	by @begin().
121  *	@prepare() is called right after devices have been suspended (ie. the
122  *	appropriate .suspend() method has been executed for each device) and
123  *	before device drivers' late suspend callbacks are executed.  It returns
124  *	0 on success or a negative error code otherwise, in which case the
125  *	system cannot enter the desired sleep state (@prepare_late(), @enter(),
126  *	and @wake() will not be called in that case).
127  *
128  * @prepare_late: Finish preparing the platform for entering the system sleep
129  *	state indicated by @begin().
130  *	@prepare_late is called before disabling nonboot CPUs and after
131  *	device drivers' late suspend callbacks have been executed.  It returns
132  *	0 on success or a negative error code otherwise, in which case the
133  *	system cannot enter the desired sleep state (@enter() will not be
134  *	executed).
135  *
136  * @enter: Enter the system sleep state indicated by @begin() or represented by
137  *	the argument if @begin() is not implemented.
138  *	This callback is mandatory.  It returns 0 on success or a negative
139  *	error code otherwise, in which case the system cannot enter the desired
140  *	sleep state.
141  *
142  * @wake: Called when the system has just left a sleep state, right after
143  *	the nonboot CPUs have been enabled and before device drivers' early
144  *	resume callbacks are executed.
145  *	This callback is optional, but should be implemented by the platforms
146  *	that implement @prepare_late().  If implemented, it is always called
147  *	after @prepare_late and @enter(), even if one of them fails.
148  *
149  * @finish: Finish wake-up of the platform.
150  *	@finish is called right prior to calling device drivers' regular suspend
151  *	callbacks.
152  *	This callback is optional, but should be implemented by the platforms
153  *	that implement @prepare().  If implemented, it is always called after
154  *	@enter() and @wake(), even if any of them fails.  It is executed after
155  *	a failing @prepare.
156  *
157  * @suspend_again: Returns whether the system should suspend again (true) or
158  *	not (false). If the platform wants to poll sensors or execute some
159  *	code during suspended without invoking userspace and most of devices,
160  *	suspend_again callback is the place assuming that periodic-wakeup or
161  *	alarm-wakeup is already setup. This allows to execute some codes while
162  *	being kept suspended in the view of userland and devices.
163  *
164  * @end: Called by the PM core right after resuming devices, to indicate to
165  *	the platform that the system has returned to the working state or
166  *	the transition to the sleep state has been aborted.
167  *	This callback is optional, but should be implemented by the platforms
168  *	that implement @begin().  Accordingly, platforms implementing @begin()
169  *	should also provide a @end() which cleans up transitions aborted before
170  *	@enter().
171  *
172  * @recover: Recover the platform from a suspend failure.
173  *	Called by the PM core if the suspending of devices fails.
174  *	This callback is optional and should only be implemented by platforms
175  *	which require special recovery actions in that situation.
176  */
177 struct platform_suspend_ops {
178 	int (*valid)(suspend_state_t state);
179 	int (*begin)(suspend_state_t state);
180 	int (*prepare)(void);
181 	int (*prepare_late)(void);
182 	int (*enter)(suspend_state_t state);
183 	void (*wake)(void);
184 	void (*finish)(void);
185 	bool (*suspend_again)(void);
186 	void (*end)(void);
187 	void (*recover)(void);
188 };
189 
190 struct platform_s2idle_ops {
191 	int (*begin)(void);
192 	int (*prepare)(void);
193 	int (*prepare_late)(void);
194 	bool (*wake)(void);
195 	void (*restore_early)(void);
196 	void (*restore)(void);
197 	void (*end)(void);
198 };
199 
200 #ifdef CONFIG_SUSPEND
201 extern suspend_state_t mem_sleep_current;
202 extern suspend_state_t mem_sleep_default;
203 
204 /**
205  * suspend_set_ops - set platform dependent suspend operations
206  * @ops: The new suspend operations to set.
207  */
208 extern void suspend_set_ops(const struct platform_suspend_ops *ops);
209 extern int suspend_valid_only_mem(suspend_state_t state);
210 
211 extern unsigned int pm_suspend_global_flags;
212 
213 #define PM_SUSPEND_FLAG_FW_SUSPEND	BIT(0)
214 #define PM_SUSPEND_FLAG_FW_RESUME	BIT(1)
215 #define PM_SUSPEND_FLAG_NO_PLATFORM	BIT(2)
216 
pm_suspend_clear_flags(void)217 static inline void pm_suspend_clear_flags(void)
218 {
219 	pm_suspend_global_flags = 0;
220 }
221 
pm_set_suspend_via_firmware(void)222 static inline void pm_set_suspend_via_firmware(void)
223 {
224 	pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_SUSPEND;
225 }
226 
pm_set_resume_via_firmware(void)227 static inline void pm_set_resume_via_firmware(void)
228 {
229 	pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_RESUME;
230 }
231 
pm_set_suspend_no_platform(void)232 static inline void pm_set_suspend_no_platform(void)
233 {
234 	pm_suspend_global_flags |= PM_SUSPEND_FLAG_NO_PLATFORM;
235 }
236 
237 /**
238  * pm_suspend_via_firmware - Check if platform firmware will suspend the system.
239  *
240  * To be called during system-wide power management transitions to sleep states
241  * or during the subsequent system-wide transitions back to the working state.
242  *
243  * Return 'true' if the platform firmware is going to be invoked at the end of
244  * the system-wide power management transition (to a sleep state) in progress in
245  * order to complete it, or if the platform firmware has been invoked in order
246  * to complete the last (or preceding) transition of the system to a sleep
247  * state.
248  *
249  * This matters if the caller needs or wants to carry out some special actions
250  * depending on whether or not control will be passed to the platform firmware
251  * subsequently (for example, the device may need to be reset before letting the
252  * platform firmware manipulate it, which is not necessary when the platform
253  * firmware is not going to be invoked) or when such special actions may have
254  * been carried out during the preceding transition of the system to a sleep
255  * state (as they may need to be taken into account).
256  */
pm_suspend_via_firmware(void)257 static inline bool pm_suspend_via_firmware(void)
258 {
259 	return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_SUSPEND);
260 }
261 
262 /**
263  * pm_resume_via_firmware - Check if platform firmware has woken up the system.
264  *
265  * To be called during system-wide power management transitions from sleep
266  * states.
267  *
268  * Return 'true' if the platform firmware has passed control to the kernel at
269  * the beginning of the system-wide power management transition in progress, so
270  * the event that woke up the system from sleep has been handled by the platform
271  * firmware.
272  */
pm_resume_via_firmware(void)273 static inline bool pm_resume_via_firmware(void)
274 {
275 	return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_RESUME);
276 }
277 
278 /**
279  * pm_suspend_no_platform - Check if platform may change device power states.
280  *
281  * To be called during system-wide power management transitions to sleep states
282  * or during the subsequent system-wide transitions back to the working state.
283  *
284  * Return 'true' if the power states of devices remain under full control of the
285  * kernel throughout the system-wide suspend and resume cycle in progress (that
286  * is, if a device is put into a certain power state during suspend, it can be
287  * expected to remain in that state during resume).
288  */
pm_suspend_no_platform(void)289 static inline bool pm_suspend_no_platform(void)
290 {
291 	return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_NO_PLATFORM);
292 }
293 
294 /* Suspend-to-idle state machnine. */
295 enum s2idle_states {
296 	S2IDLE_STATE_NONE,      /* Not suspended/suspending. */
297 	S2IDLE_STATE_ENTER,     /* Enter suspend-to-idle. */
298 	S2IDLE_STATE_WAKE,      /* Wake up from suspend-to-idle. */
299 };
300 
301 extern enum s2idle_states __read_mostly s2idle_state;
302 
idle_should_enter_s2idle(void)303 static inline bool idle_should_enter_s2idle(void)
304 {
305 	return unlikely(s2idle_state == S2IDLE_STATE_ENTER);
306 }
307 
308 extern bool pm_suspend_default_s2idle(void);
309 extern void __init pm_states_init(void);
310 extern void s2idle_set_ops(const struct platform_s2idle_ops *ops);
311 extern void s2idle_wake(void);
312 
313 /**
314  * arch_suspend_disable_irqs - disable IRQs for suspend
315  *
316  * Disables IRQs (in the default case). This is a weak symbol in the common
317  * code and thus allows architectures to override it if more needs to be
318  * done. Not called for suspend to disk.
319  */
320 extern void arch_suspend_disable_irqs(void);
321 
322 /**
323  * arch_suspend_enable_irqs - enable IRQs after suspend
324  *
325  * Enables IRQs (in the default case). This is a weak symbol in the common
326  * code and thus allows architectures to override it if more needs to be
327  * done. Not called for suspend to disk.
328  */
329 extern void arch_suspend_enable_irqs(void);
330 
331 extern int pm_suspend(suspend_state_t state);
332 extern bool sync_on_suspend_enabled;
333 #else /* !CONFIG_SUSPEND */
334 #define suspend_valid_only_mem	NULL
335 
pm_suspend_clear_flags(void)336 static inline void pm_suspend_clear_flags(void) {}
pm_set_suspend_via_firmware(void)337 static inline void pm_set_suspend_via_firmware(void) {}
pm_set_resume_via_firmware(void)338 static inline void pm_set_resume_via_firmware(void) {}
pm_suspend_via_firmware(void)339 static inline bool pm_suspend_via_firmware(void) { return false; }
pm_resume_via_firmware(void)340 static inline bool pm_resume_via_firmware(void) { return false; }
pm_suspend_no_platform(void)341 static inline bool pm_suspend_no_platform(void) { return false; }
pm_suspend_default_s2idle(void)342 static inline bool pm_suspend_default_s2idle(void) { return false; }
343 
suspend_set_ops(const struct platform_suspend_ops * ops)344 static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {}
pm_suspend(suspend_state_t state)345 static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
sync_on_suspend_enabled(void)346 static inline bool sync_on_suspend_enabled(void) { return true; }
idle_should_enter_s2idle(void)347 static inline bool idle_should_enter_s2idle(void) { return false; }
pm_states_init(void)348 static inline void __init pm_states_init(void) {}
s2idle_set_ops(const struct platform_s2idle_ops * ops)349 static inline void s2idle_set_ops(const struct platform_s2idle_ops *ops) {}
s2idle_wake(void)350 static inline void s2idle_wake(void) {}
351 #endif /* !CONFIG_SUSPEND */
352 
353 /* struct pbe is used for creating lists of pages that should be restored
354  * atomically during the resume from disk, because the page frames they have
355  * occupied before the suspend are in use.
356  */
357 struct pbe {
358 	void *address;		/* address of the copy */
359 	void *orig_address;	/* original address of a page */
360 	struct pbe *next;
361 };
362 
363 /* mm/page_alloc.c */
364 extern void mark_free_pages(struct zone *zone);
365 
366 /**
367  * struct platform_hibernation_ops - hibernation platform support
368  *
369  * The methods in this structure allow a platform to carry out special
370  * operations required by it during a hibernation transition.
371  *
372  * All the methods below, except for @recover(), must be implemented.
373  *
374  * @begin: Tell the platform driver that we're starting hibernation.
375  *	Called right after shrinking memory and before freezing devices.
376  *
377  * @end: Called by the PM core right after resuming devices, to indicate to
378  *	the platform that the system has returned to the working state.
379  *
380  * @pre_snapshot: Prepare the platform for creating the hibernation image.
381  *	Called right after devices have been frozen and before the nonboot
382  *	CPUs are disabled (runs with IRQs on).
383  *
384  * @finish: Restore the previous state of the platform after the hibernation
385  *	image has been created *or* put the platform into the normal operation
386  *	mode after the hibernation (the same method is executed in both cases).
387  *	Called right after the nonboot CPUs have been enabled and before
388  *	thawing devices (runs with IRQs on).
389  *
390  * @prepare: Prepare the platform for entering the low power state.
391  *	Called right after the hibernation image has been saved and before
392  *	devices are prepared for entering the low power state.
393  *
394  * @enter: Put the system into the low power state after the hibernation image
395  *	has been saved to disk.
396  *	Called after the nonboot CPUs have been disabled and all of the low
397  *	level devices have been shut down (runs with IRQs off).
398  *
399  * @leave: Perform the first stage of the cleanup after the system sleep state
400  *	indicated by @set_target() has been left.
401  *	Called right after the control has been passed from the boot kernel to
402  *	the image kernel, before the nonboot CPUs are enabled and before devices
403  *	are resumed.  Executed with interrupts disabled.
404  *
405  * @pre_restore: Prepare system for the restoration from a hibernation image.
406  *	Called right after devices have been frozen and before the nonboot
407  *	CPUs are disabled (runs with IRQs on).
408  *
409  * @restore_cleanup: Clean up after a failing image restoration.
410  *	Called right after the nonboot CPUs have been enabled and before
411  *	thawing devices (runs with IRQs on).
412  *
413  * @recover: Recover the platform from a failure to suspend devices.
414  *	Called by the PM core if the suspending of devices during hibernation
415  *	fails.  This callback is optional and should only be implemented by
416  *	platforms which require special recovery actions in that situation.
417  */
418 struct platform_hibernation_ops {
419 	int (*begin)(pm_message_t stage);
420 	void (*end)(void);
421 	int (*pre_snapshot)(void);
422 	void (*finish)(void);
423 	int (*prepare)(void);
424 	int (*enter)(void);
425 	void (*leave)(void);
426 	int (*pre_restore)(void);
427 	void (*restore_cleanup)(void);
428 	void (*recover)(void);
429 };
430 
431 #ifdef CONFIG_HIBERNATION
432 /* kernel/power/snapshot.c */
433 extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
register_nosave_region(unsigned long b,unsigned long e)434 static inline void __init register_nosave_region(unsigned long b, unsigned long e)
435 {
436 	__register_nosave_region(b, e, 0);
437 }
register_nosave_region_late(unsigned long b,unsigned long e)438 static inline void __init register_nosave_region_late(unsigned long b, unsigned long e)
439 {
440 	__register_nosave_region(b, e, 1);
441 }
442 extern int swsusp_page_is_forbidden(struct page *);
443 extern void swsusp_set_page_free(struct page *);
444 extern void swsusp_unset_page_free(struct page *);
445 extern unsigned long get_safe_page(gfp_t gfp_mask);
446 extern asmlinkage int swsusp_arch_suspend(void);
447 extern asmlinkage int swsusp_arch_resume(void);
448 
449 extern void hibernation_set_ops(const struct platform_hibernation_ops *ops);
450 extern int hibernate(void);
451 extern bool system_entering_hibernation(void);
452 extern bool hibernation_available(void);
453 asmlinkage int swsusp_save(void);
454 extern struct pbe *restore_pblist;
455 int pfn_is_nosave(unsigned long pfn);
456 
457 int hibernate_quiet_exec(int (*func)(void *data), void *data);
458 #else /* CONFIG_HIBERNATION */
register_nosave_region(unsigned long b,unsigned long e)459 static inline void register_nosave_region(unsigned long b, unsigned long e) {}
register_nosave_region_late(unsigned long b,unsigned long e)460 static inline void register_nosave_region_late(unsigned long b, unsigned long e) {}
swsusp_page_is_forbidden(struct page * p)461 static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
swsusp_set_page_free(struct page * p)462 static inline void swsusp_set_page_free(struct page *p) {}
swsusp_unset_page_free(struct page * p)463 static inline void swsusp_unset_page_free(struct page *p) {}
464 
hibernation_set_ops(const struct platform_hibernation_ops * ops)465 static inline void hibernation_set_ops(const struct platform_hibernation_ops *ops) {}
hibernate(void)466 static inline int hibernate(void) { return -ENOSYS; }
system_entering_hibernation(void)467 static inline bool system_entering_hibernation(void) { return false; }
hibernation_available(void)468 static inline bool hibernation_available(void) { return false; }
469 
hibernate_quiet_exec(int (* func)(void * data),void * data)470 static inline int hibernate_quiet_exec(int (*func)(void *data), void *data) {
471 	return -ENOTSUPP;
472 }
473 #endif /* CONFIG_HIBERNATION */
474 
475 #ifdef CONFIG_HIBERNATION_SNAPSHOT_DEV
476 int is_hibernate_resume_dev(dev_t dev);
477 #else
is_hibernate_resume_dev(dev_t dev)478 static inline int is_hibernate_resume_dev(dev_t dev) { return 0; }
479 #endif
480 
481 /* Hibernation and suspend events */
482 #define PM_HIBERNATION_PREPARE	0x0001 /* Going to hibernate */
483 #define PM_POST_HIBERNATION	0x0002 /* Hibernation finished */
484 #define PM_SUSPEND_PREPARE	0x0003 /* Going to suspend the system */
485 #define PM_POST_SUSPEND		0x0004 /* Suspend finished */
486 #define PM_RESTORE_PREPARE	0x0005 /* Going to restore a saved image */
487 #define PM_POST_RESTORE		0x0006 /* Restore failed */
488 
489 extern struct mutex system_transition_mutex;
490 
491 #ifdef CONFIG_PM_SLEEP
492 void save_processor_state(void);
493 void restore_processor_state(void);
494 
495 /* kernel/power/main.c */
496 extern int register_pm_notifier(struct notifier_block *nb);
497 extern int unregister_pm_notifier(struct notifier_block *nb);
498 extern void ksys_sync_helper(void);
499 
500 #define pm_notifier(fn, pri) {				\
501 	static struct notifier_block fn##_nb =			\
502 		{ .notifier_call = fn, .priority = pri };	\
503 	register_pm_notifier(&fn##_nb);			\
504 }
505 
506 /* drivers/base/power/wakeup.c */
507 extern bool events_check_enabled;
508 extern unsigned int pm_wakeup_irq;
509 extern suspend_state_t pm_suspend_target_state;
510 
511 extern bool pm_wakeup_pending(void);
512 extern void pm_system_wakeup(void);
513 extern void pm_system_cancel_wakeup(void);
514 extern void pm_wakeup_clear(bool reset);
515 extern void pm_system_irq_wakeup(unsigned int irq_number);
516 extern bool pm_get_wakeup_count(unsigned int *count, bool block);
517 extern bool pm_save_wakeup_count(unsigned int count);
518 extern void pm_wakep_autosleep_enabled(bool set);
519 extern void pm_print_active_wakeup_sources(void);
520 
521 extern void lock_system_sleep(void);
522 extern void unlock_system_sleep(void);
523 
524 #else /* !CONFIG_PM_SLEEP */
525 
register_pm_notifier(struct notifier_block * nb)526 static inline int register_pm_notifier(struct notifier_block *nb)
527 {
528 	return 0;
529 }
530 
unregister_pm_notifier(struct notifier_block * nb)531 static inline int unregister_pm_notifier(struct notifier_block *nb)
532 {
533 	return 0;
534 }
535 
ksys_sync_helper(void)536 static inline void ksys_sync_helper(void) {}
537 
538 #define pm_notifier(fn, pri)	do { (void)(fn); } while (0)
539 
pm_wakeup_pending(void)540 static inline bool pm_wakeup_pending(void) { return false; }
pm_system_wakeup(void)541 static inline void pm_system_wakeup(void) {}
pm_wakeup_clear(bool reset)542 static inline void pm_wakeup_clear(bool reset) {}
pm_system_irq_wakeup(unsigned int irq_number)543 static inline void pm_system_irq_wakeup(unsigned int irq_number) {}
544 
lock_system_sleep(void)545 static inline void lock_system_sleep(void) {}
unlock_system_sleep(void)546 static inline void unlock_system_sleep(void) {}
547 
548 #endif /* !CONFIG_PM_SLEEP */
549 
550 #ifdef CONFIG_PM_SLEEP_DEBUG
551 extern bool pm_print_times_enabled;
552 extern bool pm_debug_messages_on;
553 extern __printf(2, 3) void __pm_pr_dbg(bool defer, const char *fmt, ...);
554 #else
555 #define pm_print_times_enabled	(false)
556 #define pm_debug_messages_on	(false)
557 
558 #include <linux/printk.h>
559 
560 #define __pm_pr_dbg(defer, fmt, ...) \
561 	no_printk(KERN_DEBUG fmt, ##__VA_ARGS__)
562 #endif
563 
564 #define pm_pr_dbg(fmt, ...) \
565 	__pm_pr_dbg(false, fmt, ##__VA_ARGS__)
566 
567 #define pm_deferred_pr_dbg(fmt, ...) \
568 	__pm_pr_dbg(true, fmt, ##__VA_ARGS__)
569 
570 #ifdef CONFIG_PM_AUTOSLEEP
571 
572 /* kernel/power/autosleep.c */
573 void queue_up_suspend_work(void);
574 
575 #else /* !CONFIG_PM_AUTOSLEEP */
576 
queue_up_suspend_work(void)577 static inline void queue_up_suspend_work(void) {}
578 
579 #endif /* !CONFIG_PM_AUTOSLEEP */
580 
581 #endif /* _LINUX_SUSPEND_H */
582