Line data Source code
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
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
25 : static inline void pm_prepare_console(void)
26 : {
27 : }
28 :
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 : u64 last_hw_sleep;
72 : u64 total_hw_sleep;
73 : u64 max_hw_sleep;
74 : enum suspend_stat_step failed_steps[REC_FAILED_NUM];
75 : };
76 :
77 : extern struct suspend_stats suspend_stats;
78 :
79 0 : static inline void dpm_save_failed_dev(const char *name)
80 : {
81 0 : strscpy(suspend_stats.failed_devs[suspend_stats.last_failed_dev],
82 : name,
83 : sizeof(suspend_stats.failed_devs[0]));
84 0 : suspend_stats.last_failed_dev++;
85 0 : suspend_stats.last_failed_dev %= REC_FAILED_NUM;
86 0 : }
87 :
88 : static inline void dpm_save_failed_errno(int err)
89 : {
90 0 : suspend_stats.errno[suspend_stats.last_failed_errno] = err;
91 0 : suspend_stats.last_failed_errno++;
92 0 : suspend_stats.last_failed_errno %= REC_FAILED_NUM;
93 : }
94 :
95 : static inline void dpm_save_failed_step(enum suspend_stat_step step)
96 : {
97 0 : suspend_stats.failed_steps[suspend_stats.last_failed_step] = step;
98 0 : suspend_stats.last_failed_step++;
99 0 : suspend_stats.last_failed_step %= REC_FAILED_NUM;
100 : }
101 :
102 : /**
103 : * struct platform_suspend_ops - Callbacks for managing platform dependent
104 : * system sleep states.
105 : *
106 : * @valid: Callback to determine if given system sleep state is supported by
107 : * the platform.
108 : * Valid (ie. supported) states are advertised in /sys/power/state. Note
109 : * that it still may be impossible to enter given system sleep state if the
110 : * conditions aren't right.
111 : * There is the %suspend_valid_only_mem function available that can be
112 : * assigned to this if the platform only supports mem sleep.
113 : *
114 : * @begin: Initialise a transition to given system sleep state.
115 : * @begin() is executed right prior to suspending devices. The information
116 : * conveyed to the platform code by @begin() should be disregarded by it as
117 : * soon as @end() is executed. If @begin() fails (ie. returns nonzero),
118 : * @prepare(), @enter() and @finish() will not be called by the PM core.
119 : * This callback is optional. However, if it is implemented, the argument
120 : * passed to @enter() is redundant and should be ignored.
121 : *
122 : * @prepare: Prepare the platform for entering the system sleep state indicated
123 : * by @begin().
124 : * @prepare() is called right after devices have been suspended (ie. the
125 : * appropriate .suspend() method has been executed for each device) and
126 : * before device drivers' late suspend callbacks are executed. It returns
127 : * 0 on success or a negative error code otherwise, in which case the
128 : * system cannot enter the desired sleep state (@prepare_late(), @enter(),
129 : * and @wake() will not be called in that case).
130 : *
131 : * @prepare_late: Finish preparing the platform for entering the system sleep
132 : * state indicated by @begin().
133 : * @prepare_late is called before disabling nonboot CPUs and after
134 : * device drivers' late suspend callbacks have been executed. It returns
135 : * 0 on success or a negative error code otherwise, in which case the
136 : * system cannot enter the desired sleep state (@enter() will not be
137 : * executed).
138 : *
139 : * @enter: Enter the system sleep state indicated by @begin() or represented by
140 : * the argument if @begin() is not implemented.
141 : * This callback is mandatory. It returns 0 on success or a negative
142 : * error code otherwise, in which case the system cannot enter the desired
143 : * sleep state.
144 : *
145 : * @wake: Called when the system has just left a sleep state, right after
146 : * the nonboot CPUs have been enabled and before device drivers' early
147 : * resume callbacks are executed.
148 : * This callback is optional, but should be implemented by the platforms
149 : * that implement @prepare_late(). If implemented, it is always called
150 : * after @prepare_late and @enter(), even if one of them fails.
151 : *
152 : * @finish: Finish wake-up of the platform.
153 : * @finish is called right prior to calling device drivers' regular suspend
154 : * callbacks.
155 : * This callback is optional, but should be implemented by the platforms
156 : * that implement @prepare(). If implemented, it is always called after
157 : * @enter() and @wake(), even if any of them fails. It is executed after
158 : * a failing @prepare.
159 : *
160 : * @suspend_again: Returns whether the system should suspend again (true) or
161 : * not (false). If the platform wants to poll sensors or execute some
162 : * code during suspended without invoking userspace and most of devices,
163 : * suspend_again callback is the place assuming that periodic-wakeup or
164 : * alarm-wakeup is already setup. This allows to execute some codes while
165 : * being kept suspended in the view of userland and devices.
166 : *
167 : * @end: Called by the PM core right after resuming devices, to indicate to
168 : * the platform that the system has returned to the working state or
169 : * the transition to the sleep state has been aborted.
170 : * This callback is optional, but should be implemented by the platforms
171 : * that implement @begin(). Accordingly, platforms implementing @begin()
172 : * should also provide a @end() which cleans up transitions aborted before
173 : * @enter().
174 : *
175 : * @recover: Recover the platform from a suspend failure.
176 : * Called by the PM core if the suspending of devices fails.
177 : * This callback is optional and should only be implemented by platforms
178 : * which require special recovery actions in that situation.
179 : */
180 : struct platform_suspend_ops {
181 : int (*valid)(suspend_state_t state);
182 : int (*begin)(suspend_state_t state);
183 : int (*prepare)(void);
184 : int (*prepare_late)(void);
185 : int (*enter)(suspend_state_t state);
186 : void (*wake)(void);
187 : void (*finish)(void);
188 : bool (*suspend_again)(void);
189 : void (*end)(void);
190 : void (*recover)(void);
191 : };
192 :
193 : struct platform_s2idle_ops {
194 : int (*begin)(void);
195 : int (*prepare)(void);
196 : int (*prepare_late)(void);
197 : void (*check)(void);
198 : bool (*wake)(void);
199 : void (*restore_early)(void);
200 : void (*restore)(void);
201 : void (*end)(void);
202 : };
203 :
204 : #ifdef CONFIG_SUSPEND
205 : extern suspend_state_t pm_suspend_target_state;
206 : extern suspend_state_t mem_sleep_current;
207 : extern suspend_state_t mem_sleep_default;
208 :
209 : /**
210 : * suspend_set_ops - set platform dependent suspend operations
211 : * @ops: The new suspend operations to set.
212 : */
213 : extern void suspend_set_ops(const struct platform_suspend_ops *ops);
214 : extern int suspend_valid_only_mem(suspend_state_t state);
215 :
216 : extern unsigned int pm_suspend_global_flags;
217 :
218 : #define PM_SUSPEND_FLAG_FW_SUSPEND BIT(0)
219 : #define PM_SUSPEND_FLAG_FW_RESUME BIT(1)
220 : #define PM_SUSPEND_FLAG_NO_PLATFORM BIT(2)
221 :
222 : static inline void pm_suspend_clear_flags(void)
223 : {
224 0 : pm_suspend_global_flags = 0;
225 : }
226 :
227 : static inline void pm_set_suspend_via_firmware(void)
228 : {
229 : pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_SUSPEND;
230 : }
231 :
232 : static inline void pm_set_resume_via_firmware(void)
233 : {
234 : pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_RESUME;
235 : }
236 :
237 : static inline void pm_set_suspend_no_platform(void)
238 : {
239 0 : pm_suspend_global_flags |= PM_SUSPEND_FLAG_NO_PLATFORM;
240 : }
241 :
242 : /**
243 : * pm_suspend_via_firmware - Check if platform firmware will suspend the system.
244 : *
245 : * To be called during system-wide power management transitions to sleep states
246 : * or during the subsequent system-wide transitions back to the working state.
247 : *
248 : * Return 'true' if the platform firmware is going to be invoked at the end of
249 : * the system-wide power management transition (to a sleep state) in progress in
250 : * order to complete it, or if the platform firmware has been invoked in order
251 : * to complete the last (or preceding) transition of the system to a sleep
252 : * state.
253 : *
254 : * This matters if the caller needs or wants to carry out some special actions
255 : * depending on whether or not control will be passed to the platform firmware
256 : * subsequently (for example, the device may need to be reset before letting the
257 : * platform firmware manipulate it, which is not necessary when the platform
258 : * firmware is not going to be invoked) or when such special actions may have
259 : * been carried out during the preceding transition of the system to a sleep
260 : * state (as they may need to be taken into account).
261 : */
262 : static inline bool pm_suspend_via_firmware(void)
263 : {
264 : return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_SUSPEND);
265 : }
266 :
267 : /**
268 : * pm_resume_via_firmware - Check if platform firmware has woken up the system.
269 : *
270 : * To be called during system-wide power management transitions from sleep
271 : * states.
272 : *
273 : * Return 'true' if the platform firmware has passed control to the kernel at
274 : * the beginning of the system-wide power management transition in progress, so
275 : * the event that woke up the system from sleep has been handled by the platform
276 : * firmware.
277 : */
278 : static inline bool pm_resume_via_firmware(void)
279 : {
280 0 : return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_RESUME);
281 : }
282 :
283 : /**
284 : * pm_suspend_no_platform - Check if platform may change device power states.
285 : *
286 : * To be called during system-wide power management transitions to sleep states
287 : * or during the subsequent system-wide transitions back to the working state.
288 : *
289 : * Return 'true' if the power states of devices remain under full control of the
290 : * kernel throughout the system-wide suspend and resume cycle in progress (that
291 : * is, if a device is put into a certain power state during suspend, it can be
292 : * expected to remain in that state during resume).
293 : */
294 : static inline bool pm_suspend_no_platform(void)
295 : {
296 0 : return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_NO_PLATFORM);
297 : }
298 :
299 : /* Suspend-to-idle state machnine. */
300 : enum s2idle_states {
301 : S2IDLE_STATE_NONE, /* Not suspended/suspending. */
302 : S2IDLE_STATE_ENTER, /* Enter suspend-to-idle. */
303 : S2IDLE_STATE_WAKE, /* Wake up from suspend-to-idle. */
304 : };
305 :
306 : extern enum s2idle_states __read_mostly s2idle_state;
307 :
308 : static inline bool idle_should_enter_s2idle(void)
309 : {
310 : return unlikely(s2idle_state == S2IDLE_STATE_ENTER);
311 : }
312 :
313 : extern bool pm_suspend_default_s2idle(void);
314 : extern void __init pm_states_init(void);
315 : extern void s2idle_set_ops(const struct platform_s2idle_ops *ops);
316 : extern void s2idle_wake(void);
317 :
318 : /**
319 : * arch_suspend_disable_irqs - disable IRQs for suspend
320 : *
321 : * Disables IRQs (in the default case). This is a weak symbol in the common
322 : * code and thus allows architectures to override it if more needs to be
323 : * done. Not called for suspend to disk.
324 : */
325 : extern void arch_suspend_disable_irqs(void);
326 :
327 : /**
328 : * arch_suspend_enable_irqs - enable IRQs after suspend
329 : *
330 : * Enables IRQs (in the default case). This is a weak symbol in the common
331 : * code and thus allows architectures to override it if more needs to be
332 : * done. Not called for suspend to disk.
333 : */
334 : extern void arch_suspend_enable_irqs(void);
335 :
336 : extern int pm_suspend(suspend_state_t state);
337 : extern bool sync_on_suspend_enabled;
338 : #else /* !CONFIG_SUSPEND */
339 : #define suspend_valid_only_mem NULL
340 :
341 : #define pm_suspend_target_state (PM_SUSPEND_ON)
342 :
343 : static inline void pm_suspend_clear_flags(void) {}
344 : static inline void pm_set_suspend_via_firmware(void) {}
345 : static inline void pm_set_resume_via_firmware(void) {}
346 : static inline bool pm_suspend_via_firmware(void) { return false; }
347 : static inline bool pm_resume_via_firmware(void) { return false; }
348 : static inline bool pm_suspend_no_platform(void) { return false; }
349 : static inline bool pm_suspend_default_s2idle(void) { return false; }
350 :
351 : static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {}
352 : static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
353 : static inline bool sync_on_suspend_enabled(void) { return true; }
354 : static inline bool idle_should_enter_s2idle(void) { return false; }
355 : static inline void __init pm_states_init(void) {}
356 : static inline void s2idle_set_ops(const struct platform_s2idle_ops *ops) {}
357 : static inline void s2idle_wake(void) {}
358 : #endif /* !CONFIG_SUSPEND */
359 :
360 : /* struct pbe is used for creating lists of pages that should be restored
361 : * atomically during the resume from disk, because the page frames they have
362 : * occupied before the suspend are in use.
363 : */
364 : struct pbe {
365 : void *address; /* address of the copy */
366 : void *orig_address; /* original address of a page */
367 : struct pbe *next;
368 : };
369 :
370 : /**
371 : * struct platform_hibernation_ops - hibernation platform support
372 : *
373 : * The methods in this structure allow a platform to carry out special
374 : * operations required by it during a hibernation transition.
375 : *
376 : * All the methods below, except for @recover(), must be implemented.
377 : *
378 : * @begin: Tell the platform driver that we're starting hibernation.
379 : * Called right after shrinking memory and before freezing devices.
380 : *
381 : * @end: Called by the PM core right after resuming devices, to indicate to
382 : * the platform that the system has returned to the working state.
383 : *
384 : * @pre_snapshot: Prepare the platform for creating the hibernation image.
385 : * Called right after devices have been frozen and before the nonboot
386 : * CPUs are disabled (runs with IRQs on).
387 : *
388 : * @finish: Restore the previous state of the platform after the hibernation
389 : * image has been created *or* put the platform into the normal operation
390 : * mode after the hibernation (the same method is executed in both cases).
391 : * Called right after the nonboot CPUs have been enabled and before
392 : * thawing devices (runs with IRQs on).
393 : *
394 : * @prepare: Prepare the platform for entering the low power state.
395 : * Called right after the hibernation image has been saved and before
396 : * devices are prepared for entering the low power state.
397 : *
398 : * @enter: Put the system into the low power state after the hibernation image
399 : * has been saved to disk.
400 : * Called after the nonboot CPUs have been disabled and all of the low
401 : * level devices have been shut down (runs with IRQs off).
402 : *
403 : * @leave: Perform the first stage of the cleanup after the system sleep state
404 : * indicated by @set_target() has been left.
405 : * Called right after the control has been passed from the boot kernel to
406 : * the image kernel, before the nonboot CPUs are enabled and before devices
407 : * are resumed. Executed with interrupts disabled.
408 : *
409 : * @pre_restore: Prepare system for the restoration from a hibernation image.
410 : * Called right after devices have been frozen and before the nonboot
411 : * CPUs are disabled (runs with IRQs on).
412 : *
413 : * @restore_cleanup: Clean up after a failing image restoration.
414 : * Called right after the nonboot CPUs have been enabled and before
415 : * thawing devices (runs with IRQs on).
416 : *
417 : * @recover: Recover the platform from a failure to suspend devices.
418 : * Called by the PM core if the suspending of devices during hibernation
419 : * fails. This callback is optional and should only be implemented by
420 : * platforms which require special recovery actions in that situation.
421 : */
422 : struct platform_hibernation_ops {
423 : int (*begin)(pm_message_t stage);
424 : void (*end)(void);
425 : int (*pre_snapshot)(void);
426 : void (*finish)(void);
427 : int (*prepare)(void);
428 : int (*enter)(void);
429 : void (*leave)(void);
430 : int (*pre_restore)(void);
431 : void (*restore_cleanup)(void);
432 : void (*recover)(void);
433 : };
434 :
435 : #ifdef CONFIG_HIBERNATION
436 : /* kernel/power/snapshot.c */
437 : extern void register_nosave_region(unsigned long b, unsigned long e);
438 : extern int swsusp_page_is_forbidden(struct page *);
439 : extern void swsusp_set_page_free(struct page *);
440 : extern void swsusp_unset_page_free(struct page *);
441 : extern unsigned long get_safe_page(gfp_t gfp_mask);
442 : extern asmlinkage int swsusp_arch_suspend(void);
443 : extern asmlinkage int swsusp_arch_resume(void);
444 :
445 : extern u32 swsusp_hardware_signature;
446 : extern void hibernation_set_ops(const struct platform_hibernation_ops *ops);
447 : extern int hibernate(void);
448 : extern bool system_entering_hibernation(void);
449 : extern bool hibernation_available(void);
450 : asmlinkage int swsusp_save(void);
451 : extern struct pbe *restore_pblist;
452 : int pfn_is_nosave(unsigned long pfn);
453 :
454 : int hibernate_quiet_exec(int (*func)(void *data), void *data);
455 : int hibernate_resume_nonboot_cpu_disable(void);
456 : int arch_hibernation_header_save(void *addr, unsigned int max_size);
457 : int arch_hibernation_header_restore(void *addr);
458 :
459 : #else /* CONFIG_HIBERNATION */
460 : static inline void register_nosave_region(unsigned long b, unsigned long e) {}
461 : static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
462 : static inline void swsusp_set_page_free(struct page *p) {}
463 : static inline void swsusp_unset_page_free(struct page *p) {}
464 :
465 : static inline void hibernation_set_ops(const struct platform_hibernation_ops *ops) {}
466 : static inline int hibernate(void) { return -ENOSYS; }
467 : static inline bool system_entering_hibernation(void) { return false; }
468 : static inline bool hibernation_available(void) { return false; }
469 :
470 : static inline int hibernate_quiet_exec(int (*func)(void *data), void *data) {
471 : return -ENOTSUPP;
472 : }
473 : #endif /* CONFIG_HIBERNATION */
474 :
475 : int arch_resume_nosmt(void);
476 :
477 : #ifdef CONFIG_HIBERNATION_SNAPSHOT_DEV
478 : int is_hibernate_resume_dev(dev_t dev);
479 : #else
480 : static inline int is_hibernate_resume_dev(dev_t dev) { return 0; }
481 : #endif
482 :
483 : /* Hibernation and suspend events */
484 : #define PM_HIBERNATION_PREPARE 0x0001 /* Going to hibernate */
485 : #define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */
486 : #define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */
487 : #define PM_POST_SUSPEND 0x0004 /* Suspend finished */
488 : #define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */
489 : #define PM_POST_RESTORE 0x0006 /* Restore failed */
490 :
491 : extern struct mutex system_transition_mutex;
492 :
493 : #ifdef CONFIG_PM_SLEEP
494 : void save_processor_state(void);
495 : void restore_processor_state(void);
496 :
497 : /* kernel/power/main.c */
498 : extern int register_pm_notifier(struct notifier_block *nb);
499 : extern int unregister_pm_notifier(struct notifier_block *nb);
500 : extern void ksys_sync_helper(void);
501 : extern void pm_report_hw_sleep_time(u64 t);
502 : extern void pm_report_max_hw_sleep(u64 t);
503 :
504 : #define pm_notifier(fn, pri) { \
505 : static struct notifier_block fn##_nb = \
506 : { .notifier_call = fn, .priority = pri }; \
507 : register_pm_notifier(&fn##_nb); \
508 : }
509 :
510 : /* drivers/base/power/wakeup.c */
511 : extern bool events_check_enabled;
512 :
513 : static inline bool pm_suspended_storage(void)
514 : {
515 0 : return !gfp_has_io_fs(gfp_allowed_mask);
516 : }
517 :
518 : extern bool pm_wakeup_pending(void);
519 : extern void pm_system_wakeup(void);
520 : extern void pm_system_cancel_wakeup(void);
521 : extern void pm_wakeup_clear(unsigned int irq_number);
522 : extern void pm_system_irq_wakeup(unsigned int irq_number);
523 : extern unsigned int pm_wakeup_irq(void);
524 : extern bool pm_get_wakeup_count(unsigned int *count, bool block);
525 : extern bool pm_save_wakeup_count(unsigned int count);
526 : extern void pm_wakep_autosleep_enabled(bool set);
527 : extern void pm_print_active_wakeup_sources(void);
528 :
529 : extern unsigned int lock_system_sleep(void);
530 : extern void unlock_system_sleep(unsigned int);
531 :
532 : #else /* !CONFIG_PM_SLEEP */
533 :
534 : static inline int register_pm_notifier(struct notifier_block *nb)
535 : {
536 : return 0;
537 : }
538 :
539 : static inline int unregister_pm_notifier(struct notifier_block *nb)
540 : {
541 : return 0;
542 : }
543 :
544 : static inline void pm_report_hw_sleep_time(u64 t) {};
545 : static inline void pm_report_max_hw_sleep(u64 t) {};
546 :
547 : static inline void ksys_sync_helper(void) {}
548 :
549 : #define pm_notifier(fn, pri) do { (void)(fn); } while (0)
550 :
551 : static inline bool pm_suspended_storage(void) { return false; }
552 : static inline bool pm_wakeup_pending(void) { return false; }
553 : static inline void pm_system_wakeup(void) {}
554 : static inline void pm_wakeup_clear(bool reset) {}
555 : static inline void pm_system_irq_wakeup(unsigned int irq_number) {}
556 :
557 : static inline unsigned int lock_system_sleep(void) { return 0; }
558 : static inline void unlock_system_sleep(unsigned int flags) {}
559 :
560 : #endif /* !CONFIG_PM_SLEEP */
561 :
562 : #ifdef CONFIG_PM_SLEEP_DEBUG
563 : extern bool pm_print_times_enabled;
564 : extern bool pm_debug_messages_on;
565 : extern bool pm_debug_messages_should_print(void);
566 : static inline int pm_dyn_debug_messages_on(void)
567 : {
568 : #ifdef CONFIG_DYNAMIC_DEBUG
569 : return 1;
570 : #else
571 : return 0;
572 : #endif
573 : }
574 : #ifndef pr_fmt
575 : #define pr_fmt(fmt) "PM: " fmt
576 : #endif
577 : #define __pm_pr_dbg(fmt, ...) \
578 : do { \
579 : if (pm_debug_messages_should_print()) \
580 : printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
581 : else if (pm_dyn_debug_messages_on()) \
582 : pr_debug(fmt, ##__VA_ARGS__); \
583 : } while (0)
584 : #define __pm_deferred_pr_dbg(fmt, ...) \
585 : do { \
586 : if (pm_debug_messages_should_print()) \
587 : printk_deferred(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
588 : } while (0)
589 : #else
590 : #define pm_print_times_enabled (false)
591 : #define pm_debug_messages_on (false)
592 :
593 : #include <linux/printk.h>
594 :
595 : #define __pm_pr_dbg(fmt, ...) \
596 : no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
597 : #define __pm_deferred_pr_dbg(fmt, ...) \
598 : no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
599 : #endif
600 :
601 : /**
602 : * pm_pr_dbg - print pm sleep debug messages
603 : *
604 : * If pm_debug_messages_on is enabled and the system is entering/leaving
605 : * suspend, print message.
606 : * If pm_debug_messages_on is disabled and CONFIG_DYNAMIC_DEBUG is enabled,
607 : * print message only from instances explicitly enabled on dynamic debug's
608 : * control.
609 : * If pm_debug_messages_on is disabled and CONFIG_DYNAMIC_DEBUG is disabled,
610 : * don't print message.
611 : */
612 : #define pm_pr_dbg(fmt, ...) \
613 : __pm_pr_dbg(fmt, ##__VA_ARGS__)
614 :
615 : #define pm_deferred_pr_dbg(fmt, ...) \
616 : __pm_deferred_pr_dbg(fmt, ##__VA_ARGS__)
617 :
618 : #ifdef CONFIG_PM_AUTOSLEEP
619 :
620 : /* kernel/power/autosleep.c */
621 : void queue_up_suspend_work(void);
622 :
623 : #else /* !CONFIG_PM_AUTOSLEEP */
624 :
625 : static inline void queue_up_suspend_work(void) {}
626 :
627 : #endif /* !CONFIG_PM_AUTOSLEEP */
628 :
629 : #endif /* _LINUX_SUSPEND_H */
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