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581 lines
20 KiB
581 lines
20 KiB
/* 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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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_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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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, int km); |
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static inline void __init register_nosave_region(unsigned long b, unsigned long e) |
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{ |
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__register_nosave_region(b, e, 0); |
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} |
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static inline void __init register_nosave_region_late(unsigned long b, unsigned long e) |
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{ |
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__register_nosave_region(b, e, 1); |
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} |
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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 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 void register_nosave_region_late(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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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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#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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/* 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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|
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extern struct mutex system_transition_mutex; |
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|
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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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|
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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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|
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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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|
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/* drivers/base/power/wakeup.c */ |
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extern bool events_check_enabled; |
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extern unsigned int pm_wakeup_irq; |
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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); |
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extern void pm_system_cancel_wakeup(void); |
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extern void pm_wakeup_clear(bool reset); |
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extern void pm_system_irq_wakeup(unsigned int irq_number); |
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extern bool pm_get_wakeup_count(unsigned int *count, bool block); |
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extern bool pm_save_wakeup_count(unsigned int count); |
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extern void pm_wakep_autosleep_enabled(bool set); |
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extern void pm_print_active_wakeup_sources(void); |
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extern void lock_system_sleep(void); |
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extern void unlock_system_sleep(void); |
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#else /* !CONFIG_PM_SLEEP */ |
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static inline int register_pm_notifier(struct notifier_block *nb) |
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{ |
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return 0; |
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} |
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static inline int unregister_pm_notifier(struct notifier_block *nb) |
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{ |
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return 0; |
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} |
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static inline void ksys_sync_helper(void) {} |
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#define pm_notifier(fn, pri) do { (void)(fn); } while (0) |
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static inline bool pm_wakeup_pending(void) { return false; } |
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static inline void pm_system_wakeup(void) {} |
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static inline void pm_wakeup_clear(bool reset) {} |
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static inline void pm_system_irq_wakeup(unsigned int irq_number) {} |
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static inline void lock_system_sleep(void) {} |
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static inline void unlock_system_sleep(void) {} |
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#endif /* !CONFIG_PM_SLEEP */ |
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#ifdef CONFIG_PM_SLEEP_DEBUG |
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extern bool pm_print_times_enabled; |
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extern bool pm_debug_messages_on; |
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extern __printf(2, 3) void __pm_pr_dbg(bool defer, const char *fmt, ...); |
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#else |
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#define pm_print_times_enabled (false) |
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#define pm_debug_messages_on (false) |
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#include <linux/printk.h> |
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#define __pm_pr_dbg(defer, fmt, ...) \ |
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no_printk(KERN_DEBUG fmt, ##__VA_ARGS__) |
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#endif |
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#define pm_pr_dbg(fmt, ...) \ |
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__pm_pr_dbg(false, fmt, ##__VA_ARGS__) |
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#define pm_deferred_pr_dbg(fmt, ...) \ |
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__pm_pr_dbg(true, fmt, ##__VA_ARGS__) |
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#ifdef CONFIG_PM_AUTOSLEEP |
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/* kernel/power/autosleep.c */ |
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void queue_up_suspend_work(void); |
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#else /* !CONFIG_PM_AUTOSLEEP */ |
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static inline void queue_up_suspend_work(void) {} |
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#endif /* !CONFIG_PM_AUTOSLEEP */ |
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#endif /* _LINUX_SUSPEND_H */
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