545 lines
18 KiB
C
545 lines
18 KiB
C
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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_FREEZE ((__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_FREEZE
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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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strlcpy(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_freeze_ops {
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int (*begin)(void);
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int (*prepare)(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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/**
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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 (1 << 0)
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#define PM_SUSPEND_FLAG_FW_RESUME (1 << 1)
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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 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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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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/* Suspend-to-idle state machnine. */
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enum freeze_state {
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FREEZE_STATE_NONE, /* Not suspended/suspending. */
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FREEZE_STATE_ENTER, /* Enter suspend-to-idle. */
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FREEZE_STATE_WAKE, /* Wake up from suspend-to-idle. */
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};
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extern enum freeze_state __read_mostly suspend_freeze_state;
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static inline bool idle_should_freeze(void)
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{
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return unlikely(suspend_freeze_state == FREEZE_STATE_ENTER);
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}
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extern void __init pm_states_init(void);
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extern void freeze_set_ops(const struct platform_freeze_ops *ops);
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extern void freeze_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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#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 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 idle_should_freeze(void) { return false; }
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static inline void __init pm_states_init(void) {}
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static inline void freeze_set_ops(const struct platform_freeze_ops *ops) {}
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static inline void freeze_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.
|
||
|
|
*/
|
||
|
|
struct platform_hibernation_ops {
|
||
|
|
int (*begin)(void);
|
||
|
|
void (*end)(void);
|
||
|
|
int (*pre_snapshot)(void);
|
||
|
|
void (*finish)(void);
|
||
|
|
int (*prepare)(void);
|
||
|
|
int (*enter)(void);
|
||
|
|
void (*leave)(void);
|
||
|
|
int (*pre_restore)(void);
|
||
|
|
void (*restore_cleanup)(void);
|
||
|
|
void (*recover)(void);
|
||
|
|
};
|
||
|
|
|
||
|
|
#ifdef CONFIG_HIBERNATION
|
||
|
|
/* kernel/power/snapshot.c */
|
||
|
|
extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
|
||
|
|
static inline void __init register_nosave_region(unsigned long b, unsigned long e)
|
||
|
|
{
|
||
|
|
__register_nosave_region(b, e, 0);
|
||
|
|
}
|
||
|
|
static inline void __init register_nosave_region_late(unsigned long b, unsigned long e)
|
||
|
|
{
|
||
|
|
__register_nosave_region(b, e, 1);
|
||
|
|
}
|
||
|
|
extern int swsusp_page_is_forbidden(struct page *);
|
||
|
|
extern void swsusp_set_page_free(struct page *);
|
||
|
|
extern void swsusp_unset_page_free(struct page *);
|
||
|
|
extern unsigned long get_safe_page(gfp_t gfp_mask);
|
||
|
|
extern asmlinkage int swsusp_arch_suspend(void);
|
||
|
|
extern asmlinkage int swsusp_arch_resume(void);
|
||
|
|
|
||
|
|
extern void hibernation_set_ops(const struct platform_hibernation_ops *ops);
|
||
|
|
extern int hibernate(void);
|
||
|
|
extern bool system_entering_hibernation(void);
|
||
|
|
extern bool hibernation_available(void);
|
||
|
|
asmlinkage int swsusp_save(void);
|
||
|
|
extern struct pbe *restore_pblist;
|
||
|
|
#else /* CONFIG_HIBERNATION */
|
||
|
|
static inline void register_nosave_region(unsigned long b, unsigned long e) {}
|
||
|
|
static inline void register_nosave_region_late(unsigned long b, unsigned long e) {}
|
||
|
|
static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
|
||
|
|
static inline void swsusp_set_page_free(struct page *p) {}
|
||
|
|
static inline void swsusp_unset_page_free(struct page *p) {}
|
||
|
|
|
||
|
|
static inline void hibernation_set_ops(const struct platform_hibernation_ops *ops) {}
|
||
|
|
static inline int hibernate(void) { return -ENOSYS; }
|
||
|
|
static inline bool system_entering_hibernation(void) { return false; }
|
||
|
|
static inline bool hibernation_available(void) { return false; }
|
||
|
|
#endif /* CONFIG_HIBERNATION */
|
||
|
|
|
||
|
|
/* Hibernation and suspend events */
|
||
|
|
#define PM_HIBERNATION_PREPARE 0x0001 /* Going to hibernate */
|
||
|
|
#define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */
|
||
|
|
#define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */
|
||
|
|
#define PM_POST_SUSPEND 0x0004 /* Suspend finished */
|
||
|
|
#define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */
|
||
|
|
#define PM_POST_RESTORE 0x0006 /* Restore failed */
|
||
|
|
#define PM_USERSPACE_FROZEN 0x0007 /* Userspace frozen */
|
||
|
|
|
||
|
|
extern struct mutex pm_mutex;
|
||
|
|
|
||
|
|
#ifdef CONFIG_PM_SLEEP
|
||
|
|
void save_processor_state(void);
|
||
|
|
void restore_processor_state(void);
|
||
|
|
|
||
|
|
/* kernel/power/main.c */
|
||
|
|
extern int register_pm_notifier(struct notifier_block *nb);
|
||
|
|
extern int unregister_pm_notifier(struct notifier_block *nb);
|
||
|
|
|
||
|
|
#define pm_notifier(fn, pri) { \
|
||
|
|
static struct notifier_block fn##_nb = \
|
||
|
|
{ .notifier_call = fn, .priority = pri }; \
|
||
|
|
register_pm_notifier(&fn##_nb); \
|
||
|
|
}
|
||
|
|
|
||
|
|
/* drivers/base/power/wakeup.c */
|
||
|
|
extern bool events_check_enabled;
|
||
|
|
extern unsigned int pm_wakeup_irq;
|
||
|
|
|
||
|
|
extern bool pm_wakeup_pending(void);
|
||
|
|
extern void pm_system_wakeup(void);
|
||
|
|
extern void pm_wakeup_clear(void);
|
||
|
|
extern void pm_system_irq_wakeup(unsigned int irq_number);
|
||
|
|
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 void pm_get_active_wakeup_sources(char *pending_sources, size_t max);
|
||
|
|
|
||
|
|
static inline void lock_system_sleep(void)
|
||
|
|
{
|
||
|
|
current->flags |= PF_FREEZER_SKIP;
|
||
|
|
mutex_lock(&pm_mutex);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void unlock_system_sleep(void)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* Don't use freezer_count() because we don't want the call to
|
||
|
|
* try_to_freeze() here.
|
||
|
|
*
|
||
|
|
* Reason:
|
||
|
|
* Fundamentally, we just don't need it, because freezing condition
|
||
|
|
* doesn't come into effect until we release the pm_mutex lock,
|
||
|
|
* since the freezer always works with pm_mutex held.
|
||
|
|
*
|
||
|
|
* More importantly, in the case of hibernation,
|
||
|
|
* unlock_system_sleep() gets called in snapshot_read() and
|
||
|
|
* snapshot_write() when the freezing condition is still in effect.
|
||
|
|
* Which means, if we use try_to_freeze() here, it would make them
|
||
|
|
* enter the refrigerator, thus causing hibernation to lockup.
|
||
|
|
*/
|
||
|
|
current->flags &= ~PF_FREEZER_SKIP;
|
||
|
|
mutex_unlock(&pm_mutex);
|
||
|
|
}
|
||
|
|
|
||
|
|
#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;
|
||
|
|
}
|
||
|
|
|
||
|
|
#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(void) {}
|
||
|
|
static inline void pm_system_irq_wakeup(unsigned int irq_number) {}
|
||
|
|
|
||
|
|
static inline void lock_system_sleep(void) {}
|
||
|
|
static inline void unlock_system_sleep(void) {}
|
||
|
|
|
||
|
|
#endif /* !CONFIG_PM_SLEEP */
|
||
|
|
|
||
|
|
#ifdef CONFIG_PM_SLEEP_DEBUG
|
||
|
|
extern bool pm_print_times_enabled;
|
||
|
|
#else
|
||
|
|
#define pm_print_times_enabled (false)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#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 */
|
||
|
|
|
||
|
|
#ifdef CONFIG_ARCH_SAVE_PAGE_KEYS
|
||
|
|
/*
|
||
|
|
* The ARCH_SAVE_PAGE_KEYS functions can be used by an architecture
|
||
|
|
* to save/restore additional information to/from the array of page
|
||
|
|
* frame numbers in the hibernation image. For s390 this is used to
|
||
|
|
* save and restore the storage key for each page that is included
|
||
|
|
* in the hibernation image.
|
||
|
|
*/
|
||
|
|
unsigned long page_key_additional_pages(unsigned long pages);
|
||
|
|
int page_key_alloc(unsigned long pages);
|
||
|
|
void page_key_free(void);
|
||
|
|
void page_key_read(unsigned long *pfn);
|
||
|
|
void page_key_memorize(unsigned long *pfn);
|
||
|
|
void page_key_write(void *address);
|
||
|
|
|
||
|
|
#else /* !CONFIG_ARCH_SAVE_PAGE_KEYS */
|
||
|
|
|
||
|
|
static inline unsigned long page_key_additional_pages(unsigned long pages)
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int page_key_alloc(unsigned long pages)
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void page_key_free(void) {}
|
||
|
|
static inline void page_key_read(unsigned long *pfn) {}
|
||
|
|
static inline void page_key_memorize(unsigned long *pfn) {}
|
||
|
|
static inline void page_key_write(void *address) {}
|
||
|
|
|
||
|
|
#endif /* !CONFIG_ARCH_SAVE_PAGE_KEYS */
|
||
|
|
|
||
|
|
#endif /* _LINUX_SUSPEND_H */
|