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 {
48 SUSPEND_SUSPEND_NOIRQ,
54 struct suspend_stats {
60 int failed_suspend_late;
61 int failed_suspend_noirq;
63 int failed_resume_early;
64 int failed_resume_noirq;
65 #define REC_FAILED_NUM 2
67 char failed_devs[REC_FAILED_NUM][40];
68 int last_failed_errno;
69 int errno[REC_FAILED_NUM];
74 enum suspend_stat_step failed_steps[REC_FAILED_NUM];
77 extern struct suspend_stats suspend_stats;
79 static inline void dpm_save_failed_dev(const char *name)
81 strscpy(suspend_stats.failed_devs[suspend_stats.last_failed_dev],
83 sizeof(suspend_stats.failed_devs[0]));
84 suspend_stats.last_failed_dev++;
85 suspend_stats.last_failed_dev %= REC_FAILED_NUM;
88 static inline void dpm_save_failed_errno(int err)
90 suspend_stats.errno[suspend_stats.last_failed_errno] = err;
91 suspend_stats.last_failed_errno++;
92 suspend_stats.last_failed_errno %= REC_FAILED_NUM;
95 static inline void dpm_save_failed_step(enum suspend_stat_step step)
97 suspend_stats.failed_steps[suspend_stats.last_failed_step] = step;
98 suspend_stats.last_failed_step++;
99 suspend_stats.last_failed_step %= REC_FAILED_NUM;
103 * struct platform_suspend_ops - Callbacks for managing platform dependent
104 * system sleep states.
106 * @valid: Callback to determine if given system sleep state is supported by
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.
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.
122 * @prepare: Prepare the platform for entering the system sleep state indicated
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).
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
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
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.
152 * @finish: Finish wake-up of the platform.
153 * @finish is called right prior to calling device drivers' regular suspend
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.
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.
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
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.
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);
187 void (*finish)(void);
188 bool (*suspend_again)(void);
190 void (*recover)(void);
193 struct platform_s2idle_ops {
195 int (*prepare)(void);
196 int (*prepare_late)(void);
199 void (*restore_early)(void);
200 void (*restore)(void);
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;
210 * suspend_set_ops - set platform dependent suspend operations
211 * @ops: The new suspend operations to set.
213 extern void suspend_set_ops(const struct platform_suspend_ops *ops);
214 extern int suspend_valid_only_mem(suspend_state_t state);
216 extern unsigned int pm_suspend_global_flags;
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)
222 static inline void pm_suspend_clear_flags(void)
224 pm_suspend_global_flags = 0;
227 static inline void pm_set_suspend_via_firmware(void)
229 pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_SUSPEND;
232 static inline void pm_set_resume_via_firmware(void)
234 pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_RESUME;
237 static inline void pm_set_suspend_no_platform(void)
239 pm_suspend_global_flags |= PM_SUSPEND_FLAG_NO_PLATFORM;
243 * pm_suspend_via_firmware - Check if platform firmware will suspend the system.
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.
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
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).
262 static inline bool pm_suspend_via_firmware(void)
264 return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_SUSPEND);
268 * pm_resume_via_firmware - Check if platform firmware has woken up the system.
270 * To be called during system-wide power management transitions from sleep
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
278 static inline bool pm_resume_via_firmware(void)
280 return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_RESUME);
284 * pm_suspend_no_platform - Check if platform may change device power states.
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.
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).
294 static inline bool pm_suspend_no_platform(void)
296 return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_NO_PLATFORM);
299 /* Suspend-to-idle state machnine. */
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. */
306 extern enum s2idle_states __read_mostly s2idle_state;
308 static inline bool idle_should_enter_s2idle(void)
310 return unlikely(s2idle_state == S2IDLE_STATE_ENTER);
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);
319 * arch_suspend_disable_irqs - disable IRQs for suspend
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.
325 extern void arch_suspend_disable_irqs(void);
328 * arch_suspend_enable_irqs - enable IRQs after suspend
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.
334 extern void arch_suspend_enable_irqs(void);
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
341 #define pm_suspend_target_state (PM_SUSPEND_ON)
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; }
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 */
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.
365 void *address; /* address of the copy */
366 void *orig_address; /* original address of a page */
371 * struct platform_hibernation_ops - hibernation platform support
373 * The methods in this structure allow a platform to carry out special
374 * operations required by it during a hibernation transition.
376 * All the methods below, except for @recover(), must be implemented.
378 * @begin: Tell the platform driver that we're starting hibernation.
379 * Called right after shrinking memory and before freezing devices.
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.
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).
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).
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.
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).
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.
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).
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).
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.
422 struct platform_hibernation_ops {
423 int (*begin)(pm_message_t stage);
425 int (*pre_snapshot)(void);
426 void (*finish)(void);
427 int (*prepare)(void);
430 int (*pre_restore)(void);
431 void (*restore_cleanup)(void);
432 void (*recover)(void);
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);
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);
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);
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) {}
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; }
470 static inline int hibernate_quiet_exec(int (*func)(void *data), void *data) {
473 #endif /* CONFIG_HIBERNATION */
475 int arch_resume_nosmt(void);
477 #ifdef CONFIG_HIBERNATION_SNAPSHOT_DEV
478 int is_hibernate_resume_dev(dev_t dev);
480 static inline int is_hibernate_resume_dev(dev_t dev) { return 0; }
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 */
491 extern struct mutex system_transition_mutex;
493 #ifdef CONFIG_PM_SLEEP
494 void save_processor_state(void);
495 void restore_processor_state(void);
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);
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); \
510 /* drivers/base/power/wakeup.c */
511 extern bool events_check_enabled;
513 static inline bool pm_suspended_storage(void)
515 return !gfp_has_io_fs(gfp_allowed_mask);
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);
529 extern unsigned int lock_system_sleep(void);
530 extern void unlock_system_sleep(unsigned int);
532 #else /* !CONFIG_PM_SLEEP */
534 static inline int register_pm_notifier(struct notifier_block *nb)
539 static inline int unregister_pm_notifier(struct notifier_block *nb)
544 static inline void pm_report_hw_sleep_time(u64 t) {};
545 static inline void pm_report_max_hw_sleep(u64 t) {};
547 static inline void ksys_sync_helper(void) {}
549 #define pm_notifier(fn, pri) do { (void)(fn); } while (0)
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) {}
557 static inline unsigned int lock_system_sleep(void) { return 0; }
558 static inline void unlock_system_sleep(unsigned int flags) {}
560 #endif /* !CONFIG_PM_SLEEP */
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)
568 #ifdef CONFIG_DYNAMIC_DEBUG
575 #define pr_fmt(fmt) "PM: " fmt
577 #define __pm_pr_dbg(fmt, ...) \
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__); \
584 #define __pm_deferred_pr_dbg(fmt, ...) \
586 if (pm_debug_messages_should_print()) \
587 printk_deferred(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
590 #define pm_print_times_enabled (false)
591 #define pm_debug_messages_on (false)
593 #include <linux/printk.h>
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__)
602 * pm_pr_dbg - print pm sleep debug messages
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
609 * If pm_debug_messages_on is disabled and CONFIG_DYNAMIC_DEBUG is disabled,
610 * don't print message.
612 #define pm_pr_dbg(fmt, ...) \
613 __pm_pr_dbg(fmt, ##__VA_ARGS__)
615 #define pm_deferred_pr_dbg(fmt, ...) \
616 __pm_deferred_pr_dbg(fmt, ##__VA_ARGS__)
618 #ifdef CONFIG_PM_AUTOSLEEP
620 /* kernel/power/autosleep.c */
621 void queue_up_suspend_work(void);
623 #else /* !CONFIG_PM_AUTOSLEEP */
625 static inline void queue_up_suspend_work(void) {}
627 #endif /* !CONFIG_PM_AUTOSLEEP */
629 #endif /* _LINUX_SUSPEND_H */