333 lines
12 KiB
C
333 lines
12 KiB
C
#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 <asm/errno.h>
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#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
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extern void pm_set_vt_switch(int);
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extern int 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_set_vt_switch(int do_switch)
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{
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}
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static inline int pm_prepare_console(void)
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{
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return 0;
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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_STANDBY ((__force suspend_state_t) 1)
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#define PM_SUSPEND_MEM ((__force suspend_state_t) 3)
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#define PM_SUSPEND_MAX ((__force suspend_state_t) 4)
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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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* @wake(), and @finish() 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() and @wake()).
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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 @enter(), even if @enter() 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(), if implemented, even if any of them fails.
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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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void (*end)(void);
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void (*recover)(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(struct platform_suspend_ops *ops);
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extern int suspend_valid_only_mem(suspend_state_t state);
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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 suspend_set_ops(struct platform_suspend_ops *ops) {}
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static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
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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)(void);
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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 void hibernation_set_ops(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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#else /* CONFIG_HIBERNATION */
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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(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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#endif /* CONFIG_HIBERNATION */
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#ifdef CONFIG_HIBERNATION_NVS
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extern int hibernate_nvs_register(unsigned long start, unsigned long size);
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extern int hibernate_nvs_alloc(void);
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extern void hibernate_nvs_free(void);
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extern void hibernate_nvs_save(void);
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extern void hibernate_nvs_restore(void);
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#else /* CONFIG_HIBERNATION_NVS */
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static inline int hibernate_nvs_register(unsigned long a, unsigned long b)
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{
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return 0;
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}
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static inline int hibernate_nvs_alloc(void) { return 0; }
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static inline void hibernate_nvs_free(void) {}
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static inline void hibernate_nvs_save(void) {}
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static inline void hibernate_nvs_restore(void) {}
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#endif /* CONFIG_HIBERNATION_NVS */
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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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#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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#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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#define pm_notifier(fn, pri) do { (void)(fn); } while (0)
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#endif /* !CONFIG_PM_SLEEP */
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extern struct mutex pm_mutex;
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#ifndef CONFIG_HIBERNATION
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static inline void register_nosave_region(unsigned long b, unsigned long e)
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{
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}
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static inline void register_nosave_region_late(unsigned long b, unsigned long e)
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{
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}
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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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#else
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/* Let some subsystems like memory hotadd exclude hibernation */
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static inline void lock_system_sleep(void)
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{
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mutex_lock(&pm_mutex);
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}
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static inline void unlock_system_sleep(void)
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{
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mutex_unlock(&pm_mutex);
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}
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#endif
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#endif /* _LINUX_SUSPEND_H */
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