Linux kernel mirror (for testing)
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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
14extern void pm_set_vt_switch(int);
15#else
16static inline void pm_set_vt_switch(int do_switch)
17{
18}
19#endif
20
21#ifdef CONFIG_VT_CONSOLE_SLEEP
22extern void pm_prepare_console(void);
23extern void pm_restore_console(void);
24#else
25static inline void pm_prepare_console(void)
26{
27}
28
29static inline void pm_restore_console(void)
30{
31}
32#endif
33
34typedef 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
43enum 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
54struct 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
74extern struct suspend_stats suspend_stats;
75
76static 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
85static 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
92static 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 */
177struct 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
190struct platform_s2idle_ops {
191 int (*begin)(void);
192 int (*prepare)(void);
193 void (*wake)(void);
194 void (*sync)(void);
195 void (*restore)(void);
196 void (*end)(void);
197};
198
199#ifdef CONFIG_SUSPEND
200extern suspend_state_t mem_sleep_current;
201extern suspend_state_t mem_sleep_default;
202
203/**
204 * suspend_set_ops - set platform dependent suspend operations
205 * @ops: The new suspend operations to set.
206 */
207extern void suspend_set_ops(const struct platform_suspend_ops *ops);
208extern int suspend_valid_only_mem(suspend_state_t state);
209
210extern unsigned int pm_suspend_global_flags;
211
212#define PM_SUSPEND_FLAG_FW_SUSPEND BIT(0)
213#define PM_SUSPEND_FLAG_FW_RESUME BIT(1)
214#define PM_SUSPEND_FLAG_NO_PLATFORM BIT(2)
215
216static inline void pm_suspend_clear_flags(void)
217{
218 pm_suspend_global_flags = 0;
219}
220
221static inline void pm_set_suspend_via_firmware(void)
222{
223 pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_SUSPEND;
224}
225
226static inline void pm_set_resume_via_firmware(void)
227{
228 pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_RESUME;
229}
230
231static inline void pm_set_suspend_no_platform(void)
232{
233 pm_suspend_global_flags |= PM_SUSPEND_FLAG_NO_PLATFORM;
234}
235
236/**
237 * pm_suspend_via_firmware - Check if platform firmware will suspend the system.
238 *
239 * To be called during system-wide power management transitions to sleep states
240 * or during the subsequent system-wide transitions back to the working state.
241 *
242 * Return 'true' if the platform firmware is going to be invoked at the end of
243 * the system-wide power management transition (to a sleep state) in progress in
244 * order to complete it, or if the platform firmware has been invoked in order
245 * to complete the last (or preceding) transition of the system to a sleep
246 * state.
247 *
248 * This matters if the caller needs or wants to carry out some special actions
249 * depending on whether or not control will be passed to the platform firmware
250 * subsequently (for example, the device may need to be reset before letting the
251 * platform firmware manipulate it, which is not necessary when the platform
252 * firmware is not going to be invoked) or when such special actions may have
253 * been carried out during the preceding transition of the system to a sleep
254 * state (as they may need to be taken into account).
255 */
256static inline bool pm_suspend_via_firmware(void)
257{
258 return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_SUSPEND);
259}
260
261/**
262 * pm_resume_via_firmware - Check if platform firmware has woken up the system.
263 *
264 * To be called during system-wide power management transitions from sleep
265 * states.
266 *
267 * Return 'true' if the platform firmware has passed control to the kernel at
268 * the beginning of the system-wide power management transition in progress, so
269 * the event that woke up the system from sleep has been handled by the platform
270 * firmware.
271 */
272static inline bool pm_resume_via_firmware(void)
273{
274 return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_RESUME);
275}
276
277/**
278 * pm_suspend_no_platform - Check if platform may change device power states.
279 *
280 * To be called during system-wide power management transitions to sleep states
281 * or during the subsequent system-wide transitions back to the working state.
282 *
283 * Return 'true' if the power states of devices remain under full control of the
284 * kernel throughout the system-wide suspend and resume cycle in progress (that
285 * is, if a device is put into a certain power state during suspend, it can be
286 * expected to remain in that state during resume).
287 */
288static inline bool pm_suspend_no_platform(void)
289{
290 return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_NO_PLATFORM);
291}
292
293/* Suspend-to-idle state machnine. */
294enum s2idle_states {
295 S2IDLE_STATE_NONE, /* Not suspended/suspending. */
296 S2IDLE_STATE_ENTER, /* Enter suspend-to-idle. */
297 S2IDLE_STATE_WAKE, /* Wake up from suspend-to-idle. */
298};
299
300extern enum s2idle_states __read_mostly s2idle_state;
301
302static inline bool idle_should_enter_s2idle(void)
303{
304 return unlikely(s2idle_state == S2IDLE_STATE_ENTER);
305}
306
307extern bool pm_suspend_via_s2idle(void);
308extern void __init pm_states_init(void);
309extern void s2idle_set_ops(const struct platform_s2idle_ops *ops);
310extern void s2idle_wake(void);
311
312/**
313 * arch_suspend_disable_irqs - disable IRQs for suspend
314 *
315 * Disables IRQs (in the default case). This is a weak symbol in the common
316 * code and thus allows architectures to override it if more needs to be
317 * done. Not called for suspend to disk.
318 */
319extern void arch_suspend_disable_irqs(void);
320
321/**
322 * arch_suspend_enable_irqs - enable IRQs after suspend
323 *
324 * Enables IRQs (in the default case). This is a weak symbol in the common
325 * code and thus allows architectures to override it if more needs to be
326 * done. Not called for suspend to disk.
327 */
328extern void arch_suspend_enable_irqs(void);
329
330extern int pm_suspend(suspend_state_t state);
331#else /* !CONFIG_SUSPEND */
332#define suspend_valid_only_mem NULL
333
334static inline void pm_suspend_clear_flags(void) {}
335static inline void pm_set_suspend_via_firmware(void) {}
336static inline void pm_set_resume_via_firmware(void) {}
337static inline bool pm_suspend_via_firmware(void) { return false; }
338static inline bool pm_resume_via_firmware(void) { return false; }
339static inline bool pm_suspend_via_s2idle(void) { return false; }
340
341static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {}
342static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
343static inline bool idle_should_enter_s2idle(void) { return false; }
344static inline void __init pm_states_init(void) {}
345static inline void s2idle_set_ops(const struct platform_s2idle_ops *ops) {}
346static inline void s2idle_wake(void) {}
347#endif /* !CONFIG_SUSPEND */
348
349/* struct pbe is used for creating lists of pages that should be restored
350 * atomically during the resume from disk, because the page frames they have
351 * occupied before the suspend are in use.
352 */
353struct pbe {
354 void *address; /* address of the copy */
355 void *orig_address; /* original address of a page */
356 struct pbe *next;
357};
358
359/* mm/page_alloc.c */
360extern void mark_free_pages(struct zone *zone);
361
362/**
363 * struct platform_hibernation_ops - hibernation platform support
364 *
365 * The methods in this structure allow a platform to carry out special
366 * operations required by it during a hibernation transition.
367 *
368 * All the methods below, except for @recover(), must be implemented.
369 *
370 * @begin: Tell the platform driver that we're starting hibernation.
371 * Called right after shrinking memory and before freezing devices.
372 *
373 * @end: Called by the PM core right after resuming devices, to indicate to
374 * the platform that the system has returned to the working state.
375 *
376 * @pre_snapshot: Prepare the platform for creating the hibernation image.
377 * Called right after devices have been frozen and before the nonboot
378 * CPUs are disabled (runs with IRQs on).
379 *
380 * @finish: Restore the previous state of the platform after the hibernation
381 * image has been created *or* put the platform into the normal operation
382 * mode after the hibernation (the same method is executed in both cases).
383 * Called right after the nonboot CPUs have been enabled and before
384 * thawing devices (runs with IRQs on).
385 *
386 * @prepare: Prepare the platform for entering the low power state.
387 * Called right after the hibernation image has been saved and before
388 * devices are prepared for entering the low power state.
389 *
390 * @enter: Put the system into the low power state after the hibernation image
391 * has been saved to disk.
392 * Called after the nonboot CPUs have been disabled and all of the low
393 * level devices have been shut down (runs with IRQs off).
394 *
395 * @leave: Perform the first stage of the cleanup after the system sleep state
396 * indicated by @set_target() has been left.
397 * Called right after the control has been passed from the boot kernel to
398 * the image kernel, before the nonboot CPUs are enabled and before devices
399 * are resumed. Executed with interrupts disabled.
400 *
401 * @pre_restore: Prepare system for the restoration from a hibernation image.
402 * Called right after devices have been frozen and before the nonboot
403 * CPUs are disabled (runs with IRQs on).
404 *
405 * @restore_cleanup: Clean up after a failing image restoration.
406 * Called right after the nonboot CPUs have been enabled and before
407 * thawing devices (runs with IRQs on).
408 *
409 * @recover: Recover the platform from a failure to suspend devices.
410 * Called by the PM core if the suspending of devices during hibernation
411 * fails. This callback is optional and should only be implemented by
412 * platforms which require special recovery actions in that situation.
413 */
414struct platform_hibernation_ops {
415 int (*begin)(pm_message_t stage);
416 void (*end)(void);
417 int (*pre_snapshot)(void);
418 void (*finish)(void);
419 int (*prepare)(void);
420 int (*enter)(void);
421 void (*leave)(void);
422 int (*pre_restore)(void);
423 void (*restore_cleanup)(void);
424 void (*recover)(void);
425};
426
427#ifdef CONFIG_HIBERNATION
428/* kernel/power/snapshot.c */
429extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
430static inline void __init register_nosave_region(unsigned long b, unsigned long e)
431{
432 __register_nosave_region(b, e, 0);
433}
434static inline void __init register_nosave_region_late(unsigned long b, unsigned long e)
435{
436 __register_nosave_region(b, e, 1);
437}
438extern int swsusp_page_is_forbidden(struct page *);
439extern void swsusp_set_page_free(struct page *);
440extern void swsusp_unset_page_free(struct page *);
441extern unsigned long get_safe_page(gfp_t gfp_mask);
442extern asmlinkage int swsusp_arch_suspend(void);
443extern asmlinkage int swsusp_arch_resume(void);
444
445extern void hibernation_set_ops(const struct platform_hibernation_ops *ops);
446extern int hibernate(void);
447extern bool system_entering_hibernation(void);
448extern bool hibernation_available(void);
449asmlinkage int swsusp_save(void);
450extern struct pbe *restore_pblist;
451#else /* CONFIG_HIBERNATION */
452static inline void register_nosave_region(unsigned long b, unsigned long e) {}
453static inline void register_nosave_region_late(unsigned long b, unsigned long e) {}
454static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
455static inline void swsusp_set_page_free(struct page *p) {}
456static inline void swsusp_unset_page_free(struct page *p) {}
457
458static inline void hibernation_set_ops(const struct platform_hibernation_ops *ops) {}
459static inline int hibernate(void) { return -ENOSYS; }
460static inline bool system_entering_hibernation(void) { return false; }
461static inline bool hibernation_available(void) { return false; }
462#endif /* CONFIG_HIBERNATION */
463
464/* Hibernation and suspend events */
465#define PM_HIBERNATION_PREPARE 0x0001 /* Going to hibernate */
466#define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */
467#define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */
468#define PM_POST_SUSPEND 0x0004 /* Suspend finished */
469#define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */
470#define PM_POST_RESTORE 0x0006 /* Restore failed */
471
472extern struct mutex system_transition_mutex;
473
474#ifdef CONFIG_PM_SLEEP
475void save_processor_state(void);
476void restore_processor_state(void);
477
478/* kernel/power/main.c */
479extern int register_pm_notifier(struct notifier_block *nb);
480extern int unregister_pm_notifier(struct notifier_block *nb);
481extern void ksys_sync_helper(void);
482
483#define pm_notifier(fn, pri) { \
484 static struct notifier_block fn##_nb = \
485 { .notifier_call = fn, .priority = pri }; \
486 register_pm_notifier(&fn##_nb); \
487}
488
489/* drivers/base/power/wakeup.c */
490extern bool events_check_enabled;
491extern unsigned int pm_wakeup_irq;
492extern suspend_state_t pm_suspend_target_state;
493
494extern bool pm_wakeup_pending(void);
495extern void pm_system_wakeup(void);
496extern void pm_system_cancel_wakeup(void);
497extern void pm_wakeup_clear(bool reset);
498extern void pm_system_irq_wakeup(unsigned int irq_number);
499extern bool pm_get_wakeup_count(unsigned int *count, bool block);
500extern bool pm_save_wakeup_count(unsigned int count);
501extern void pm_wakep_autosleep_enabled(bool set);
502extern void pm_print_active_wakeup_sources(void);
503
504extern void lock_system_sleep(void);
505extern void unlock_system_sleep(void);
506
507#else /* !CONFIG_PM_SLEEP */
508
509static inline int register_pm_notifier(struct notifier_block *nb)
510{
511 return 0;
512}
513
514static inline int unregister_pm_notifier(struct notifier_block *nb)
515{
516 return 0;
517}
518
519static inline void ksys_sync_helper(void) {}
520
521#define pm_notifier(fn, pri) do { (void)(fn); } while (0)
522
523static inline bool pm_wakeup_pending(void) { return false; }
524static inline void pm_system_wakeup(void) {}
525static inline void pm_wakeup_clear(bool reset) {}
526static inline void pm_system_irq_wakeup(unsigned int irq_number) {}
527
528static inline void lock_system_sleep(void) {}
529static inline void unlock_system_sleep(void) {}
530
531#endif /* !CONFIG_PM_SLEEP */
532
533#ifdef CONFIG_PM_SLEEP_DEBUG
534extern bool pm_print_times_enabled;
535extern bool pm_debug_messages_on;
536extern __printf(2, 3) void __pm_pr_dbg(bool defer, const char *fmt, ...);
537#else
538#define pm_print_times_enabled (false)
539#define pm_debug_messages_on (false)
540
541#include <linux/printk.h>
542
543#define __pm_pr_dbg(defer, fmt, ...) \
544 no_printk(KERN_DEBUG fmt, ##__VA_ARGS__)
545#endif
546
547#define pm_pr_dbg(fmt, ...) \
548 __pm_pr_dbg(false, fmt, ##__VA_ARGS__)
549
550#define pm_deferred_pr_dbg(fmt, ...) \
551 __pm_pr_dbg(true, fmt, ##__VA_ARGS__)
552
553#ifdef CONFIG_PM_AUTOSLEEP
554
555/* kernel/power/autosleep.c */
556void queue_up_suspend_work(void);
557
558#else /* !CONFIG_PM_AUTOSLEEP */
559
560static inline void queue_up_suspend_work(void) {}
561
562#endif /* !CONFIG_PM_AUTOSLEEP */
563
564#ifdef CONFIG_ARCH_SAVE_PAGE_KEYS
565/*
566 * The ARCH_SAVE_PAGE_KEYS functions can be used by an architecture
567 * to save/restore additional information to/from the array of page
568 * frame numbers in the hibernation image. For s390 this is used to
569 * save and restore the storage key for each page that is included
570 * in the hibernation image.
571 */
572unsigned long page_key_additional_pages(unsigned long pages);
573int page_key_alloc(unsigned long pages);
574void page_key_free(void);
575void page_key_read(unsigned long *pfn);
576void page_key_memorize(unsigned long *pfn);
577void page_key_write(void *address);
578
579#else /* !CONFIG_ARCH_SAVE_PAGE_KEYS */
580
581static inline unsigned long page_key_additional_pages(unsigned long pages)
582{
583 return 0;
584}
585
586static inline int page_key_alloc(unsigned long pages)
587{
588 return 0;
589}
590
591static inline void page_key_free(void) {}
592static inline void page_key_read(unsigned long *pfn) {}
593static inline void page_key_memorize(unsigned long *pfn) {}
594static inline void page_key_write(void *address) {}
595
596#endif /* !CONFIG_ARCH_SAVE_PAGE_KEYS */
597
598#endif /* _LINUX_SUSPEND_H */