1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_SUSPEND_H
3 #define _LINUX_SUSPEND_H
5 #include <linux/swap.h>
6 #include <linux/notifier.h>
7 #include <linux/init.h>
10 #include <linux/freezer.h>
11 #include <asm/errno.h>
14 extern void pm_set_vt_switch(int);
16 static inline void pm_set_vt_switch(int do_switch)
21 #ifdef CONFIG_VT_CONSOLE_SLEEP
22 extern void pm_prepare_console(void);
23 extern void pm_restore_console(void);
25 static inline void pm_prepare_console(void)
29 static inline void pm_restore_console(void)
34 typedef int __bitwise suspend_state_t;
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)
43 enum suspend_stat_step {
49 SUSPEND_SUSPEND_NOIRQ,
55 #define SUSPEND_NR_STEPS SUSPEND_RESUME
57 struct suspend_stats {
58 unsigned int step_failures[SUSPEND_NR_STEPS];
61 #define REC_FAILED_NUM 2
63 char failed_devs[REC_FAILED_NUM][40];
64 int last_failed_errno;
65 int errno[REC_FAILED_NUM];
70 enum suspend_stat_step failed_steps[REC_FAILED_NUM];
73 extern struct suspend_stats suspend_stats;
75 static inline void dpm_save_failed_dev(const char *name)
77 strscpy(suspend_stats.failed_devs[suspend_stats.last_failed_dev],
79 sizeof(suspend_stats.failed_devs[0]));
80 suspend_stats.last_failed_dev++;
81 suspend_stats.last_failed_dev %= REC_FAILED_NUM;
84 static inline void dpm_save_failed_errno(int err)
86 suspend_stats.errno[suspend_stats.last_failed_errno] = err;
87 suspend_stats.last_failed_errno++;
88 suspend_stats.last_failed_errno %= REC_FAILED_NUM;
91 static inline void dpm_save_failed_step(enum suspend_stat_step step)
93 suspend_stats.step_failures[step-1]++;
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;
100 * struct platform_suspend_ops - Callbacks for managing platform dependent
101 * system sleep states.
103 * @valid: Callback to determine if given system sleep state is supported by
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.
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.
119 * @prepare: Prepare the platform for entering the system sleep state indicated
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).
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
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
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.
149 * @finish: Finish wake-up of the platform.
150 * @finish is called right prior to calling device drivers' regular suspend
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.
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.
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
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.
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);
184 void (*finish)(void);
185 bool (*suspend_again)(void);
187 void (*recover)(void);
190 struct platform_s2idle_ops {
192 int (*prepare)(void);
193 int (*prepare_late)(void);
196 void (*restore_early)(void);
197 void (*restore)(void);
201 #ifdef CONFIG_SUSPEND
202 extern suspend_state_t pm_suspend_target_state;
203 extern suspend_state_t mem_sleep_current;
204 extern suspend_state_t mem_sleep_default;
207 * suspend_set_ops - set platform dependent suspend operations
208 * @ops: The new suspend operations to set.
210 extern void suspend_set_ops(const struct platform_suspend_ops *ops);
211 extern int suspend_valid_only_mem(suspend_state_t state);
213 extern unsigned int pm_suspend_global_flags;
215 #define PM_SUSPEND_FLAG_FW_SUSPEND BIT(0)
216 #define PM_SUSPEND_FLAG_FW_RESUME BIT(1)
217 #define PM_SUSPEND_FLAG_NO_PLATFORM BIT(2)
219 static inline void pm_suspend_clear_flags(void)
221 pm_suspend_global_flags = 0;
224 static inline void pm_set_suspend_via_firmware(void)
226 pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_SUSPEND;
229 static inline void pm_set_resume_via_firmware(void)
231 pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_RESUME;
234 static inline void pm_set_suspend_no_platform(void)
236 pm_suspend_global_flags |= PM_SUSPEND_FLAG_NO_PLATFORM;
240 * pm_suspend_via_firmware - Check if platform firmware will suspend the system.
242 * To be called during system-wide power management transitions to sleep states
243 * or during the subsequent system-wide transitions back to the working state.
245 * Return 'true' if the platform firmware is going to be invoked at the end of
246 * the system-wide power management transition (to a sleep state) in progress in
247 * order to complete it, or if the platform firmware has been invoked in order
248 * to complete the last (or preceding) transition of the system to a sleep
251 * This matters if the caller needs or wants to carry out some special actions
252 * depending on whether or not control will be passed to the platform firmware
253 * subsequently (for example, the device may need to be reset before letting the
254 * platform firmware manipulate it, which is not necessary when the platform
255 * firmware is not going to be invoked) or when such special actions may have
256 * been carried out during the preceding transition of the system to a sleep
257 * state (as they may need to be taken into account).
259 static inline bool pm_suspend_via_firmware(void)
261 return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_SUSPEND);
265 * pm_resume_via_firmware - Check if platform firmware has woken up the system.
267 * To be called during system-wide power management transitions from sleep
270 * Return 'true' if the platform firmware has passed control to the kernel at
271 * the beginning of the system-wide power management transition in progress, so
272 * the event that woke up the system from sleep has been handled by the platform
275 static inline bool pm_resume_via_firmware(void)
277 return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_RESUME);
281 * pm_suspend_no_platform - Check if platform may change device power states.
283 * To be called during system-wide power management transitions to sleep states
284 * or during the subsequent system-wide transitions back to the working state.
286 * Return 'true' if the power states of devices remain under full control of the
287 * kernel throughout the system-wide suspend and resume cycle in progress (that
288 * is, if a device is put into a certain power state during suspend, it can be
289 * expected to remain in that state during resume).
291 static inline bool pm_suspend_no_platform(void)
293 return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_NO_PLATFORM);
296 /* Suspend-to-idle state machnine. */
298 S2IDLE_STATE_NONE, /* Not suspended/suspending. */
299 S2IDLE_STATE_ENTER, /* Enter suspend-to-idle. */
300 S2IDLE_STATE_WAKE, /* Wake up from suspend-to-idle. */
303 extern enum s2idle_states __read_mostly s2idle_state;
305 static inline bool idle_should_enter_s2idle(void)
307 return unlikely(s2idle_state == S2IDLE_STATE_ENTER);
310 extern bool pm_suspend_default_s2idle(void);
311 extern void __init pm_states_init(void);
312 extern void s2idle_set_ops(const struct platform_s2idle_ops *ops);
313 extern void s2idle_wake(void);
316 * arch_suspend_disable_irqs - disable IRQs for suspend
318 * Disables IRQs (in the default case). This is a weak symbol in the common
319 * code and thus allows architectures to override it if more needs to be
320 * done. Not called for suspend to disk.
322 extern void arch_suspend_disable_irqs(void);
325 * arch_suspend_enable_irqs - enable IRQs after suspend
327 * Enables IRQs (in the default case). This is a weak symbol in the common
328 * code and thus allows architectures to override it if more needs to be
329 * done. Not called for suspend to disk.
331 extern void arch_suspend_enable_irqs(void);
333 extern int pm_suspend(suspend_state_t state);
334 extern bool sync_on_suspend_enabled;
335 #else /* !CONFIG_SUSPEND */
336 #define suspend_valid_only_mem NULL
338 #define pm_suspend_target_state (PM_SUSPEND_ON)
340 static inline void pm_suspend_clear_flags(void) {}
341 static inline void pm_set_suspend_via_firmware(void) {}
342 static inline void pm_set_resume_via_firmware(void) {}
343 static inline bool pm_suspend_via_firmware(void) { return false; }
344 static inline bool pm_resume_via_firmware(void) { return false; }
345 static inline bool pm_suspend_no_platform(void) { return false; }
346 static inline bool pm_suspend_default_s2idle(void) { return false; }
348 static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {}
349 static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
350 static inline bool sync_on_suspend_enabled(void) { return true; }
351 static inline bool idle_should_enter_s2idle(void) { return false; }
352 static inline void __init pm_states_init(void) {}
353 static inline void s2idle_set_ops(const struct platform_s2idle_ops *ops) {}
354 static inline void s2idle_wake(void) {}
355 #endif /* !CONFIG_SUSPEND */
357 /* struct pbe is used for creating lists of pages that should be restored
358 * atomically during the resume from disk, because the page frames they have
359 * occupied before the suspend are in use.
362 void *address; /* address of the copy */
363 void *orig_address; /* original address of a page */
368 * struct platform_hibernation_ops - hibernation platform support
370 * The methods in this structure allow a platform to carry out special
371 * operations required by it during a hibernation transition.
373 * All the methods below, except for @recover(), must be implemented.
375 * @begin: Tell the platform driver that we're starting hibernation.
376 * Called right after shrinking memory and before freezing devices.
378 * @end: Called by the PM core right after resuming devices, to indicate to
379 * the platform that the system has returned to the working state.
381 * @pre_snapshot: Prepare the platform for creating the hibernation image.
382 * Called right after devices have been frozen and before the nonboot
383 * CPUs are disabled (runs with IRQs on).
385 * @finish: Restore the previous state of the platform after the hibernation
386 * image has been created *or* put the platform into the normal operation
387 * mode after the hibernation (the same method is executed in both cases).
388 * Called right after the nonboot CPUs have been enabled and before
389 * thawing devices (runs with IRQs on).
391 * @prepare: Prepare the platform for entering the low power state.
392 * Called right after the hibernation image has been saved and before
393 * devices are prepared for entering the low power state.
395 * @enter: Put the system into the low power state after the hibernation image
396 * has been saved to disk.
397 * Called after the nonboot CPUs have been disabled and all of the low
398 * level devices have been shut down (runs with IRQs off).
400 * @leave: Perform the first stage of the cleanup after the system sleep state
401 * indicated by @set_target() has been left.
402 * Called right after the control has been passed from the boot kernel to
403 * the image kernel, before the nonboot CPUs are enabled and before devices
404 * are resumed. Executed with interrupts disabled.
406 * @pre_restore: Prepare system for the restoration from a hibernation image.
407 * Called right after devices have been frozen and before the nonboot
408 * CPUs are disabled (runs with IRQs on).
410 * @restore_cleanup: Clean up after a failing image restoration.
411 * Called right after the nonboot CPUs have been enabled and before
412 * thawing devices (runs with IRQs on).
414 * @recover: Recover the platform from a failure to suspend devices.
415 * Called by the PM core if the suspending of devices during hibernation
416 * fails. This callback is optional and should only be implemented by
417 * platforms which require special recovery actions in that situation.
419 struct platform_hibernation_ops {
420 int (*begin)(pm_message_t stage);
422 int (*pre_snapshot)(void);
423 void (*finish)(void);
424 int (*prepare)(void);
427 int (*pre_restore)(void);
428 void (*restore_cleanup)(void);
429 void (*recover)(void);
432 #ifdef CONFIG_HIBERNATION
433 /* kernel/power/snapshot.c */
434 extern void register_nosave_region(unsigned long b, unsigned long e);
435 extern int swsusp_page_is_forbidden(struct page *);
436 extern void swsusp_set_page_free(struct page *);
437 extern void swsusp_unset_page_free(struct page *);
438 extern unsigned long get_safe_page(gfp_t gfp_mask);
439 extern asmlinkage int swsusp_arch_suspend(void);
440 extern asmlinkage int swsusp_arch_resume(void);
442 extern u32 swsusp_hardware_signature;
443 extern void hibernation_set_ops(const struct platform_hibernation_ops *ops);
444 extern int hibernate(void);
445 extern bool system_entering_hibernation(void);
446 extern bool hibernation_available(void);
447 asmlinkage int swsusp_save(void);
448 extern struct pbe *restore_pblist;
449 int pfn_is_nosave(unsigned long pfn);
451 int hibernate_quiet_exec(int (*func)(void *data), void *data);
452 int hibernate_resume_nonboot_cpu_disable(void);
453 int arch_hibernation_header_save(void *addr, unsigned int max_size);
454 int arch_hibernation_header_restore(void *addr);
456 #else /* CONFIG_HIBERNATION */
457 static inline void register_nosave_region(unsigned long b, unsigned long e) {}
458 static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
459 static inline void swsusp_set_page_free(struct page *p) {}
460 static inline void swsusp_unset_page_free(struct page *p) {}
462 static inline void hibernation_set_ops(const struct platform_hibernation_ops *ops) {}
463 static inline int hibernate(void) { return -ENOSYS; }
464 static inline bool system_entering_hibernation(void) { return false; }
465 static inline bool hibernation_available(void) { return false; }
467 static inline int hibernate_quiet_exec(int (*func)(void *data), void *data) {
470 #endif /* CONFIG_HIBERNATION */
472 int arch_resume_nosmt(void);
474 #ifdef CONFIG_HIBERNATION_SNAPSHOT_DEV
475 int is_hibernate_resume_dev(dev_t dev);
477 static inline int is_hibernate_resume_dev(dev_t dev) { return 0; }
480 /* Hibernation and suspend events */
481 #define PM_HIBERNATION_PREPARE 0x0001 /* Going to hibernate */
482 #define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */
483 #define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */
484 #define PM_POST_SUSPEND 0x0004 /* Suspend finished */
485 #define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */
486 #define PM_POST_RESTORE 0x0006 /* Restore failed */
488 extern struct mutex system_transition_mutex;
490 #ifdef CONFIG_PM_SLEEP
491 void save_processor_state(void);
492 void restore_processor_state(void);
494 /* kernel/power/main.c */
495 extern int register_pm_notifier(struct notifier_block *nb);
496 extern int unregister_pm_notifier(struct notifier_block *nb);
497 extern void ksys_sync_helper(void);
498 extern void pm_report_hw_sleep_time(u64 t);
499 extern void pm_report_max_hw_sleep(u64 t);
501 #define pm_notifier(fn, pri) { \
502 static struct notifier_block fn##_nb = \
503 { .notifier_call = fn, .priority = pri }; \
504 register_pm_notifier(&fn##_nb); \
507 /* drivers/base/power/wakeup.c */
508 extern bool events_check_enabled;
510 static inline bool pm_suspended_storage(void)
512 return !gfp_has_io_fs(gfp_allowed_mask);
515 extern bool pm_wakeup_pending(void);
516 extern void pm_system_wakeup(void);
517 extern void pm_system_cancel_wakeup(void);
518 extern void pm_wakeup_clear(unsigned int irq_number);
519 extern void pm_system_irq_wakeup(unsigned int irq_number);
520 extern unsigned int pm_wakeup_irq(void);
521 extern bool pm_get_wakeup_count(unsigned int *count, bool block);
522 extern bool pm_save_wakeup_count(unsigned int count);
523 extern void pm_wakep_autosleep_enabled(bool set);
524 extern void pm_print_active_wakeup_sources(void);
526 extern unsigned int lock_system_sleep(void);
527 extern void unlock_system_sleep(unsigned int);
529 #else /* !CONFIG_PM_SLEEP */
531 static inline int register_pm_notifier(struct notifier_block *nb)
536 static inline int unregister_pm_notifier(struct notifier_block *nb)
541 static inline void pm_report_hw_sleep_time(u64 t) {};
542 static inline void pm_report_max_hw_sleep(u64 t) {};
544 static inline void ksys_sync_helper(void) {}
546 #define pm_notifier(fn, pri) do { (void)(fn); } while (0)
548 static inline bool pm_suspended_storage(void) { return false; }
549 static inline bool pm_wakeup_pending(void) { return false; }
550 static inline void pm_system_wakeup(void) {}
551 static inline void pm_wakeup_clear(bool reset) {}
552 static inline void pm_system_irq_wakeup(unsigned int irq_number) {}
554 static inline unsigned int lock_system_sleep(void) { return 0; }
555 static inline void unlock_system_sleep(unsigned int flags) {}
557 #endif /* !CONFIG_PM_SLEEP */
559 #ifdef CONFIG_PM_SLEEP_DEBUG
560 extern bool pm_print_times_enabled;
561 extern bool pm_debug_messages_on;
562 extern bool pm_debug_messages_should_print(void);
563 static inline int pm_dyn_debug_messages_on(void)
565 #ifdef CONFIG_DYNAMIC_DEBUG
572 #define pr_fmt(fmt) "PM: " fmt
574 #define __pm_pr_dbg(fmt, ...) \
576 if (pm_debug_messages_should_print()) \
577 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
578 else if (pm_dyn_debug_messages_on()) \
579 pr_debug(fmt, ##__VA_ARGS__); \
581 #define __pm_deferred_pr_dbg(fmt, ...) \
583 if (pm_debug_messages_should_print()) \
584 printk_deferred(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
587 #define pm_print_times_enabled (false)
588 #define pm_debug_messages_on (false)
590 #include <linux/printk.h>
592 #define __pm_pr_dbg(fmt, ...) \
593 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
594 #define __pm_deferred_pr_dbg(fmt, ...) \
595 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
599 * pm_pr_dbg - print pm sleep debug messages
601 * If pm_debug_messages_on is enabled and the system is entering/leaving
602 * suspend, print message.
603 * If pm_debug_messages_on is disabled and CONFIG_DYNAMIC_DEBUG is enabled,
604 * print message only from instances explicitly enabled on dynamic debug's
606 * If pm_debug_messages_on is disabled and CONFIG_DYNAMIC_DEBUG is disabled,
607 * don't print message.
609 #define pm_pr_dbg(fmt, ...) \
610 __pm_pr_dbg(fmt, ##__VA_ARGS__)
612 #define pm_deferred_pr_dbg(fmt, ...) \
613 __pm_deferred_pr_dbg(fmt, ##__VA_ARGS__)
615 #ifdef CONFIG_PM_AUTOSLEEP
617 /* kernel/power/autosleep.c */
618 void queue_up_suspend_work(void);
620 #else /* !CONFIG_PM_AUTOSLEEP */
622 static inline void queue_up_suspend_work(void) {}
624 #endif /* !CONFIG_PM_AUTOSLEEP */
626 #endif /* _LINUX_SUSPEND_H */