609 lines
21 KiB
C
609 lines
21 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SUSPEND_H
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#define _LINUX_SUSPEND_H
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#include <linux/swap.h>
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#include <linux/notifier.h>
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#include <linux/init.h>
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#include <linux/pm.h>
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#include <linux/mm.h>
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#include <linux/freezer.h>
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#include <asm/errno.h>
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#ifdef CONFIG_VT
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extern void pm_set_vt_switch(int);
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#else
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static inline void pm_set_vt_switch(int do_switch)
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{
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}
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#endif
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#ifdef CONFIG_VT_CONSOLE_SLEEP
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extern void pm_prepare_console(void);
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extern void pm_restore_console(void);
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#else
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static inline void pm_prepare_console(void)
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{
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}
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static inline void pm_restore_console(void)
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{
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}
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#endif
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typedef int __bitwise suspend_state_t;
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#define PM_SUSPEND_ON ((__force suspend_state_t) 0)
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#define PM_SUSPEND_TO_IDLE ((__force suspend_state_t) 1)
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#define PM_SUSPEND_STANDBY ((__force suspend_state_t) 2)
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#define PM_SUSPEND_MEM ((__force suspend_state_t) 3)
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#define PM_SUSPEND_MIN PM_SUSPEND_TO_IDLE
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#define PM_SUSPEND_MAX ((__force suspend_state_t) 4)
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enum suspend_stat_step {
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SUSPEND_FREEZE = 1,
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SUSPEND_PREPARE,
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SUSPEND_SUSPEND,
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SUSPEND_SUSPEND_LATE,
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SUSPEND_SUSPEND_NOIRQ,
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SUSPEND_RESUME_NOIRQ,
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SUSPEND_RESUME_EARLY,
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SUSPEND_RESUME
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};
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struct suspend_stats {
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int success;
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int fail;
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int failed_freeze;
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int failed_prepare;
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int failed_suspend;
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int failed_suspend_late;
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int failed_suspend_noirq;
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int failed_resume;
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int failed_resume_early;
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int failed_resume_noirq;
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#define REC_FAILED_NUM 2
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int last_failed_dev;
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char failed_devs[REC_FAILED_NUM][40];
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int last_failed_errno;
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int errno[REC_FAILED_NUM];
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int last_failed_step;
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enum suspend_stat_step failed_steps[REC_FAILED_NUM];
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};
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extern struct suspend_stats suspend_stats;
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static inline void dpm_save_failed_dev(const char *name)
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{
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strscpy(suspend_stats.failed_devs[suspend_stats.last_failed_dev],
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name,
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sizeof(suspend_stats.failed_devs[0]));
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suspend_stats.last_failed_dev++;
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suspend_stats.last_failed_dev %= REC_FAILED_NUM;
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}
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static inline void dpm_save_failed_errno(int err)
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{
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suspend_stats.errno[suspend_stats.last_failed_errno] = err;
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suspend_stats.last_failed_errno++;
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suspend_stats.last_failed_errno %= REC_FAILED_NUM;
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}
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static inline void dpm_save_failed_step(enum suspend_stat_step step)
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{
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suspend_stats.failed_steps[suspend_stats.last_failed_step] = step;
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suspend_stats.last_failed_step++;
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suspend_stats.last_failed_step %= REC_FAILED_NUM;
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}
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/**
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* struct platform_suspend_ops - Callbacks for managing platform dependent
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* system sleep states.
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*
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* @valid: Callback to determine if given system sleep state is supported by
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* the platform.
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* Valid (ie. supported) states are advertised in /sys/power/state. Note
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* that it still may be impossible to enter given system sleep state if the
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* conditions aren't right.
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* There is the %suspend_valid_only_mem function available that can be
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* assigned to this if the platform only supports mem sleep.
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*
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* @begin: Initialise a transition to given system sleep state.
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* @begin() is executed right prior to suspending devices. The information
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* conveyed to the platform code by @begin() should be disregarded by it as
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* soon as @end() is executed. If @begin() fails (ie. returns nonzero),
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* @prepare(), @enter() and @finish() will not be called by the PM core.
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* This callback is optional. However, if it is implemented, the argument
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* passed to @enter() is redundant and should be ignored.
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*
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* @prepare: Prepare the platform for entering the system sleep state indicated
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* by @begin().
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* @prepare() is called right after devices have been suspended (ie. the
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* appropriate .suspend() method has been executed for each device) and
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* before device drivers' late suspend callbacks are executed. It returns
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* 0 on success or a negative error code otherwise, in which case the
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* system cannot enter the desired sleep state (@prepare_late(), @enter(),
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* and @wake() will not be called in that case).
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*
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* @prepare_late: Finish preparing the platform for entering the system sleep
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* state indicated by @begin().
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* @prepare_late is called before disabling nonboot CPUs and after
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* device drivers' late suspend callbacks have been executed. It returns
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* 0 on success or a negative error code otherwise, in which case the
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* system cannot enter the desired sleep state (@enter() will not be
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* executed).
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*
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* @enter: Enter the system sleep state indicated by @begin() or represented by
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* the argument if @begin() is not implemented.
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* This callback is mandatory. It returns 0 on success or a negative
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* error code otherwise, in which case the system cannot enter the desired
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* sleep state.
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*
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* @wake: Called when the system has just left a sleep state, right after
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* the nonboot CPUs have been enabled and before device drivers' early
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* resume callbacks are executed.
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* This callback is optional, but should be implemented by the platforms
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* that implement @prepare_late(). If implemented, it is always called
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* after @prepare_late and @enter(), even if one of them fails.
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*
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* @finish: Finish wake-up of the platform.
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* @finish is called right prior to calling device drivers' regular suspend
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* callbacks.
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* This callback is optional, but should be implemented by the platforms
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* that implement @prepare(). If implemented, it is always called after
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* @enter() and @wake(), even if any of them fails. It is executed after
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* a failing @prepare.
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*
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* @suspend_again: Returns whether the system should suspend again (true) or
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* not (false). If the platform wants to poll sensors or execute some
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* code during suspended without invoking userspace and most of devices,
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* suspend_again callback is the place assuming that periodic-wakeup or
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* alarm-wakeup is already setup. This allows to execute some codes while
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* being kept suspended in the view of userland and devices.
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*
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* @end: Called by the PM core right after resuming devices, to indicate to
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* the platform that the system has returned to the working state or
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* the transition to the sleep state has been aborted.
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* This callback is optional, but should be implemented by the platforms
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* that implement @begin(). Accordingly, platforms implementing @begin()
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* should also provide a @end() which cleans up transitions aborted before
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* @enter().
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*
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* @recover: Recover the platform from a suspend failure.
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* Called by the PM core if the suspending of devices fails.
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* This callback is optional and should only be implemented by platforms
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* which require special recovery actions in that situation.
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*/
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struct platform_suspend_ops {
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int (*valid)(suspend_state_t state);
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int (*begin)(suspend_state_t state);
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int (*prepare)(void);
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int (*prepare_late)(void);
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int (*enter)(suspend_state_t state);
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void (*wake)(void);
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void (*finish)(void);
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bool (*suspend_again)(void);
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void (*end)(void);
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void (*recover)(void);
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};
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struct platform_s2idle_ops {
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int (*begin)(void);
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int (*prepare)(void);
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int (*prepare_late)(void);
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void (*check)(void);
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bool (*wake)(void);
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void (*restore_early)(void);
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void (*restore)(void);
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void (*end)(void);
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};
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#ifdef CONFIG_SUSPEND
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extern suspend_state_t mem_sleep_current;
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extern suspend_state_t mem_sleep_default;
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/**
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* suspend_set_ops - set platform dependent suspend operations
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* @ops: The new suspend operations to set.
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*/
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extern void suspend_set_ops(const struct platform_suspend_ops *ops);
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extern int suspend_valid_only_mem(suspend_state_t state);
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extern unsigned int pm_suspend_global_flags;
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#define PM_SUSPEND_FLAG_FW_SUSPEND BIT(0)
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#define PM_SUSPEND_FLAG_FW_RESUME BIT(1)
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#define PM_SUSPEND_FLAG_NO_PLATFORM BIT(2)
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static inline void pm_suspend_clear_flags(void)
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{
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pm_suspend_global_flags = 0;
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}
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static inline void pm_set_suspend_via_firmware(void)
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{
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pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_SUSPEND;
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}
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static inline void pm_set_resume_via_firmware(void)
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{
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pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_RESUME;
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}
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static inline void pm_set_suspend_no_platform(void)
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{
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pm_suspend_global_flags |= PM_SUSPEND_FLAG_NO_PLATFORM;
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}
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/**
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* pm_suspend_via_firmware - Check if platform firmware will suspend the system.
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*
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* To be called during system-wide power management transitions to sleep states
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* or during the subsequent system-wide transitions back to the working state.
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*
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* Return 'true' if the platform firmware is going to be invoked at the end of
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* the system-wide power management transition (to a sleep state) in progress in
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* order to complete it, or if the platform firmware has been invoked in order
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* to complete the last (or preceding) transition of the system to a sleep
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* state.
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*
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* This matters if the caller needs or wants to carry out some special actions
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* depending on whether or not control will be passed to the platform firmware
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* subsequently (for example, the device may need to be reset before letting the
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* platform firmware manipulate it, which is not necessary when the platform
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* firmware is not going to be invoked) or when such special actions may have
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* been carried out during the preceding transition of the system to a sleep
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* state (as they may need to be taken into account).
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*/
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static inline bool pm_suspend_via_firmware(void)
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{
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return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_SUSPEND);
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}
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/**
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* pm_resume_via_firmware - Check if platform firmware has woken up the system.
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*
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* To be called during system-wide power management transitions from sleep
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* states.
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*
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* Return 'true' if the platform firmware has passed control to the kernel at
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* the beginning of the system-wide power management transition in progress, so
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* the event that woke up the system from sleep has been handled by the platform
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* firmware.
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*/
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static inline bool pm_resume_via_firmware(void)
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{
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return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_RESUME);
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}
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/**
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* pm_suspend_no_platform - Check if platform may change device power states.
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*
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* To be called during system-wide power management transitions to sleep states
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* or during the subsequent system-wide transitions back to the working state.
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*
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* Return 'true' if the power states of devices remain under full control of the
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* kernel throughout the system-wide suspend and resume cycle in progress (that
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* is, if a device is put into a certain power state during suspend, it can be
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* expected to remain in that state during resume).
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*/
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static inline bool pm_suspend_no_platform(void)
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{
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return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_NO_PLATFORM);
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}
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/* Suspend-to-idle state machnine. */
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enum s2idle_states {
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S2IDLE_STATE_NONE, /* Not suspended/suspending. */
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S2IDLE_STATE_ENTER, /* Enter suspend-to-idle. */
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S2IDLE_STATE_WAKE, /* Wake up from suspend-to-idle. */
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};
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extern enum s2idle_states __read_mostly s2idle_state;
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static inline bool idle_should_enter_s2idle(void)
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{
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return unlikely(s2idle_state == S2IDLE_STATE_ENTER);
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}
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extern bool pm_suspend_default_s2idle(void);
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extern void __init pm_states_init(void);
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extern void s2idle_set_ops(const struct platform_s2idle_ops *ops);
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extern void s2idle_wake(void);
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/**
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* arch_suspend_disable_irqs - disable IRQs for suspend
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*
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* Disables IRQs (in the default case). This is a weak symbol in the common
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* code and thus allows architectures to override it if more needs to be
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* done. Not called for suspend to disk.
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*/
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extern void arch_suspend_disable_irqs(void);
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/**
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* arch_suspend_enable_irqs - enable IRQs after suspend
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*
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* Enables IRQs (in the default case). This is a weak symbol in the common
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* code and thus allows architectures to override it if more needs to be
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* done. Not called for suspend to disk.
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*/
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extern void arch_suspend_enable_irqs(void);
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extern int pm_suspend(suspend_state_t state);
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extern bool sync_on_suspend_enabled;
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#else /* !CONFIG_SUSPEND */
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#define suspend_valid_only_mem NULL
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static inline void pm_suspend_clear_flags(void) {}
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static inline void pm_set_suspend_via_firmware(void) {}
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static inline void pm_set_resume_via_firmware(void) {}
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static inline bool pm_suspend_via_firmware(void) { return false; }
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static inline bool pm_resume_via_firmware(void) { return false; }
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static inline bool pm_suspend_no_platform(void) { return false; }
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static inline bool pm_suspend_default_s2idle(void) { return false; }
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static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {}
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static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
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static inline bool sync_on_suspend_enabled(void) { return true; }
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static inline bool idle_should_enter_s2idle(void) { return false; }
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static inline void __init pm_states_init(void) {}
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static inline void s2idle_set_ops(const struct platform_s2idle_ops *ops) {}
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static inline void s2idle_wake(void) {}
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#endif /* !CONFIG_SUSPEND */
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/* struct pbe is used for creating lists of pages that should be restored
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* atomically during the resume from disk, because the page frames they have
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* occupied before the suspend are in use.
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*/
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struct pbe {
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void *address; /* address of the copy */
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void *orig_address; /* original address of a page */
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struct pbe *next;
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};
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/* mm/page_alloc.c */
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extern void mark_free_pages(struct zone *zone);
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/**
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* struct platform_hibernation_ops - hibernation platform support
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*
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* The methods in this structure allow a platform to carry out special
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* operations required by it during a hibernation transition.
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*
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* All the methods below, except for @recover(), must be implemented.
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*
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* @begin: Tell the platform driver that we're starting hibernation.
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* Called right after shrinking memory and before freezing devices.
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*
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* @end: Called by the PM core right after resuming devices, to indicate to
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* the platform that the system has returned to the working state.
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*
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* @pre_snapshot: Prepare the platform for creating the hibernation image.
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* Called right after devices have been frozen and before the nonboot
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* CPUs are disabled (runs with IRQs on).
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*
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* @finish: Restore the previous state of the platform after the hibernation
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* image has been created *or* put the platform into the normal operation
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* mode after the hibernation (the same method is executed in both cases).
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* Called right after the nonboot CPUs have been enabled and before
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* thawing devices (runs with IRQs on).
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*
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* @prepare: Prepare the platform for entering the low power state.
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* Called right after the hibernation image has been saved and before
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* devices are prepared for entering the low power state.
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*
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* @enter: Put the system into the low power state after the hibernation image
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* has been saved to disk.
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* Called after the nonboot CPUs have been disabled and all of the low
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* level devices have been shut down (runs with IRQs off).
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*
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* @leave: Perform the first stage of the cleanup after the system sleep state
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* indicated by @set_target() has been left.
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* Called right after the control has been passed from the boot kernel to
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* the image kernel, before the nonboot CPUs are enabled and before devices
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* are resumed. Executed with interrupts disabled.
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*
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* @pre_restore: Prepare system for the restoration from a hibernation image.
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* Called right after devices have been frozen and before the nonboot
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* CPUs are disabled (runs with IRQs on).
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*
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* @restore_cleanup: Clean up after a failing image restoration.
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* Called right after the nonboot CPUs have been enabled and before
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* thawing devices (runs with IRQs on).
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*
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* @recover: Recover the platform from a failure to suspend devices.
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* Called by the PM core if the suspending of devices during hibernation
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* fails. This callback is optional and should only be implemented by
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* platforms which require special recovery actions in that situation.
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*/
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struct platform_hibernation_ops {
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int (*begin)(pm_message_t stage);
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void (*end)(void);
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int (*pre_snapshot)(void);
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void (*finish)(void);
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int (*prepare)(void);
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int (*enter)(void);
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void (*leave)(void);
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int (*pre_restore)(void);
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void (*restore_cleanup)(void);
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void (*recover)(void);
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};
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#ifdef CONFIG_HIBERNATION
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/* kernel/power/snapshot.c */
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extern void register_nosave_region(unsigned long b, unsigned long e);
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extern int swsusp_page_is_forbidden(struct page *);
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extern void swsusp_set_page_free(struct page *);
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extern void swsusp_unset_page_free(struct page *);
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extern unsigned long get_safe_page(gfp_t gfp_mask);
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extern asmlinkage int swsusp_arch_suspend(void);
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extern asmlinkage int swsusp_arch_resume(void);
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extern u32 swsusp_hardware_signature;
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extern void hibernation_set_ops(const struct platform_hibernation_ops *ops);
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extern int hibernate(void);
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extern bool system_entering_hibernation(void);
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extern bool hibernation_available(void);
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asmlinkage int swsusp_save(void);
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extern struct pbe *restore_pblist;
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int pfn_is_nosave(unsigned long pfn);
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int hibernate_quiet_exec(int (*func)(void *data), void *data);
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#else /* CONFIG_HIBERNATION */
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static inline void register_nosave_region(unsigned long b, unsigned long e) {}
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static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
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static inline void swsusp_set_page_free(struct page *p) {}
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static inline void swsusp_unset_page_free(struct page *p) {}
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static inline void hibernation_set_ops(const struct platform_hibernation_ops *ops) {}
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static inline int hibernate(void) { return -ENOSYS; }
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static inline bool system_entering_hibernation(void) { return false; }
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static inline bool hibernation_available(void) { return false; }
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|
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static inline int hibernate_quiet_exec(int (*func)(void *data), void *data) {
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return -ENOTSUPP;
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|
}
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|
#endif /* CONFIG_HIBERNATION */
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|
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|
#ifdef CONFIG_HIBERNATION_SNAPSHOT_DEV
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int is_hibernate_resume_dev(dev_t dev);
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#else
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static inline int is_hibernate_resume_dev(dev_t dev) { return 0; }
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#endif
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|
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/* Hibernation and suspend events */
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#define PM_HIBERNATION_PREPARE 0x0001 /* Going to hibernate */
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#define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */
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#define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */
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|
#define PM_POST_SUSPEND 0x0004 /* Suspend finished */
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|
#define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */
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|
#define PM_POST_RESTORE 0x0006 /* Restore failed */
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|
|
|
extern struct mutex system_transition_mutex;
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|
|
|
#ifdef CONFIG_PM_SLEEP
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|
void save_processor_state(void);
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|
void restore_processor_state(void);
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|
|
|
/* kernel/power/main.c */
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|
extern int register_pm_notifier(struct notifier_block *nb);
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|
extern int unregister_pm_notifier(struct notifier_block *nb);
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|
extern void ksys_sync_helper(void);
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|
|
|
#define pm_notifier(fn, pri) { \
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|
static struct notifier_block fn##_nb = \
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|
{ .notifier_call = fn, .priority = pri }; \
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|
register_pm_notifier(&fn##_nb); \
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|
}
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|
|
|
/* drivers/base/power/wakeup.c */
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|
extern bool events_check_enabled;
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|
extern suspend_state_t pm_suspend_target_state;
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|
|
|
extern bool pm_wakeup_pending(void);
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|
extern void pm_system_wakeup(void);
|
|
extern void pm_system_cancel_wakeup(void);
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|
extern void pm_wakeup_clear(unsigned int irq_number);
|
|
extern void pm_system_irq_wakeup(unsigned int irq_number);
|
|
extern unsigned int pm_wakeup_irq(void);
|
|
extern bool pm_get_wakeup_count(unsigned int *count, bool block);
|
|
extern bool pm_save_wakeup_count(unsigned int count);
|
|
extern void pm_wakep_autosleep_enabled(bool set);
|
|
extern void pm_print_active_wakeup_sources(void);
|
|
|
|
extern unsigned int lock_system_sleep(void);
|
|
extern void unlock_system_sleep(unsigned int);
|
|
|
|
#else /* !CONFIG_PM_SLEEP */
|
|
|
|
static inline int register_pm_notifier(struct notifier_block *nb)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int unregister_pm_notifier(struct notifier_block *nb)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void ksys_sync_helper(void) {}
|
|
|
|
#define pm_notifier(fn, pri) do { (void)(fn); } while (0)
|
|
|
|
static inline bool pm_wakeup_pending(void) { return false; }
|
|
static inline void pm_system_wakeup(void) {}
|
|
static inline void pm_wakeup_clear(bool reset) {}
|
|
static inline void pm_system_irq_wakeup(unsigned int irq_number) {}
|
|
|
|
static inline unsigned int lock_system_sleep(void) { return 0; }
|
|
static inline void unlock_system_sleep(unsigned int flags) {}
|
|
|
|
#endif /* !CONFIG_PM_SLEEP */
|
|
|
|
#ifdef CONFIG_PM_SLEEP_DEBUG
|
|
extern bool pm_print_times_enabled;
|
|
extern bool pm_debug_messages_on;
|
|
static inline int pm_dyn_debug_messages_on(void)
|
|
{
|
|
#ifdef CONFIG_DYNAMIC_DEBUG
|
|
return 1;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
#ifndef pr_fmt
|
|
#define pr_fmt(fmt) "PM: " fmt
|
|
#endif
|
|
#define __pm_pr_dbg(fmt, ...) \
|
|
do { \
|
|
if (pm_debug_messages_on) \
|
|
printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
|
|
else if (pm_dyn_debug_messages_on()) \
|
|
pr_debug(fmt, ##__VA_ARGS__); \
|
|
} while (0)
|
|
#define __pm_deferred_pr_dbg(fmt, ...) \
|
|
do { \
|
|
if (pm_debug_messages_on) \
|
|
printk_deferred(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
|
|
} while (0)
|
|
#else
|
|
#define pm_print_times_enabled (false)
|
|
#define pm_debug_messages_on (false)
|
|
|
|
#include <linux/printk.h>
|
|
|
|
#define __pm_pr_dbg(fmt, ...) \
|
|
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
|
|
#define __pm_deferred_pr_dbg(fmt, ...) \
|
|
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
|
|
#endif
|
|
|
|
/**
|
|
* pm_pr_dbg - print pm sleep debug messages
|
|
*
|
|
* If pm_debug_messages_on is enabled, print message.
|
|
* If pm_debug_messages_on is disabled and CONFIG_DYNAMIC_DEBUG is enabled,
|
|
* print message only from instances explicitly enabled on dynamic debug's
|
|
* control.
|
|
* If pm_debug_messages_on is disabled and CONFIG_DYNAMIC_DEBUG is disabled,
|
|
* don't print message.
|
|
*/
|
|
#define pm_pr_dbg(fmt, ...) \
|
|
__pm_pr_dbg(fmt, ##__VA_ARGS__)
|
|
|
|
#define pm_deferred_pr_dbg(fmt, ...) \
|
|
__pm_deferred_pr_dbg(fmt, ##__VA_ARGS__)
|
|
|
|
#ifdef CONFIG_PM_AUTOSLEEP
|
|
|
|
/* kernel/power/autosleep.c */
|
|
void queue_up_suspend_work(void);
|
|
|
|
#else /* !CONFIG_PM_AUTOSLEEP */
|
|
|
|
static inline void queue_up_suspend_work(void) {}
|
|
|
|
#endif /* !CONFIG_PM_AUTOSLEEP */
|
|
|
|
#endif /* _LINUX_SUSPEND_H */
|