X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Flinux%2Fsuspend.h;h=1d7d4c5797ee93c37ab2d7f035f26fa114649a3f;hb=3668805a544a6229d6135a4427b8dfe7c343b61f;hp=388cace9751f06b9ee9496e2824a79e4bb9d839f;hpb=296699de6bdc717189a331ab6bbe90e05c94db06;p=safe%2Fjmp%2Flinux-2.6 diff --git a/include/linux/suspend.h b/include/linux/suspend.h index 388cace..1d7d4c5 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -1,5 +1,5 @@ -#ifndef _LINUX_SWSUSP_H -#define _LINUX_SWSUSP_H +#ifndef _LINUX_SUSPEND_H +#define _LINUX_SUSPEND_H #if defined(CONFIG_X86) || defined(CONFIG_FRV) || defined(CONFIG_PPC32) || defined(CONFIG_PPC64) #include @@ -9,6 +9,115 @@ #include #include #include +#include + +#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) +extern int pm_prepare_console(void); +extern void pm_restore_console(void); +#else +static inline int pm_prepare_console(void) { return 0; } +static inline void pm_restore_console(void) {} +#endif + +typedef int __bitwise suspend_state_t; + +#define PM_SUSPEND_ON ((__force suspend_state_t) 0) +#define PM_SUSPEND_STANDBY ((__force suspend_state_t) 1) +#define PM_SUSPEND_MEM ((__force suspend_state_t) 3) +#define PM_SUSPEND_MAX ((__force suspend_state_t) 4) + +/** + * struct platform_suspend_ops - Callbacks for managing platform dependent + * system sleep states. + * + * @valid: Callback to determine if given system sleep state is supported by + * the platform. + * Valid (ie. supported) states are advertised in /sys/power/state. Note + * that it still may be impossible to enter given system sleep state if the + * conditions aren't right. + * There is the %suspend_valid_only_mem function available that can be + * assigned to this if the platform only supports mem sleep. + * + * @begin: Initialise a transition to given system sleep state. + * @begin() is executed right prior to suspending devices. The information + * conveyed to the platform code by @begin() should be disregarded by it as + * soon as @end() is executed. If @begin() fails (ie. returns nonzero), + * @prepare(), @enter() and @finish() will not be called by the PM core. + * This callback is optional. However, if it is implemented, the argument + * passed to @enter() is redundant and should be ignored. + * + * @prepare: Prepare the platform for entering the system sleep state indicated + * by @begin(). + * @prepare() is called right after devices have been suspended (ie. the + * appropriate .suspend() method has been executed for each device) and + * before the nonboot CPUs are disabled (it is executed with IRQs enabled). + * This callback is optional. It returns 0 on success or a negative + * error code otherwise, in which case the system cannot enter the desired + * sleep state (@enter() and @finish() will not be called in that case). + * + * @enter: Enter the system sleep state indicated by @begin() or represented by + * the argument if @begin() is not implemented. + * This callback is mandatory. It returns 0 on success or a negative + * error code otherwise, in which case the system cannot enter the desired + * sleep state. + * + * @finish: Called when the system has just left a sleep state, right after + * the nonboot CPUs have been enabled and before devices are resumed (it is + * executed with IRQs enabled). + * This callback is optional, but should be implemented by the platforms + * that implement @prepare(). If implemented, it is always called after + * @enter() (even if @enter() fails). + * + * @end: Called by the PM core right after resuming devices, to indicate to + * the platform that the system has returned to the working state or + * the transition to the sleep state has been aborted. + * This callback is optional, but should be implemented by the platforms + * that implement @begin(), but platforms implementing @begin() should + * also provide a @end() which cleans up transitions aborted before + * @enter(). + */ +struct platform_suspend_ops { + int (*valid)(suspend_state_t state); + int (*begin)(suspend_state_t state); + int (*prepare)(void); + int (*enter)(suspend_state_t state); + void (*finish)(void); + void (*end)(void); +}; + +#ifdef CONFIG_SUSPEND +/** + * suspend_set_ops - set platform dependent suspend operations + * @ops: The new suspend operations to set. + */ +extern void suspend_set_ops(struct platform_suspend_ops *ops); +extern int suspend_valid_only_mem(suspend_state_t state); + +/** + * arch_suspend_disable_irqs - disable IRQs for suspend + * + * Disables IRQs (in the default case). This is a weak symbol in the common + * code and thus allows architectures to override it if more needs to be + * done. Not called for suspend to disk. + */ +extern void arch_suspend_disable_irqs(void); + +/** + * arch_suspend_enable_irqs - enable IRQs after suspend + * + * Enables IRQs (in the default case). This is a weak symbol in the common + * code and thus allows architectures to override it if more needs to be + * done. Not called for suspend to disk. + */ +extern void arch_suspend_enable_irqs(void); + +extern int pm_suspend(suspend_state_t state); +#else /* !CONFIG_SUSPEND */ +#define suspend_valid_only_mem NULL + +static inline void suspend_set_ops(struct platform_suspend_ops *ops) {} +static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; } +#endif /* !CONFIG_SUSPEND */ /* struct pbe is used for creating lists of pages that should be restored * atomically during the resume from disk, because the page frames they have @@ -21,35 +130,63 @@ struct pbe { }; /* mm/page_alloc.c */ -extern void drain_local_pages(void); extern void mark_free_pages(struct zone *zone); -#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) -extern int pm_prepare_console(void); -extern void pm_restore_console(void); -#else -static inline int pm_prepare_console(void) { return 0; } -static inline void pm_restore_console(void) {} -#endif - /** - * struct hibernation_ops - hibernation platform support + * struct platform_hibernation_ops - hibernation platform support + * + * The methods in this structure allow a platform to carry out special + * operations required by it during a hibernation transition. + * + * All the methods below must be implemented. + * + * @begin: Tell the platform driver that we're starting hibernation. + * Called right after shrinking memory and before freezing devices. * - * The methods in this structure allow a platform to override the default - * mechanism of shutting down the machine during a hibernation transition. + * @end: Called by the PM core right after resuming devices, to indicate to + * the platform that the system has returned to the working state. * - * All three methods must be assigned. + * @pre_snapshot: Prepare the platform for creating the hibernation image. + * Called right after devices have been frozen and before the nonboot + * CPUs are disabled (runs with IRQs on). * - * @prepare: prepare system for hibernation - * @enter: shut down system after state has been saved to disk - * @finish: finish/clean up after state has been reloaded - * @pre_restore: prepare system for the restoration from a hibernation image - * @restore_cleanup: clean up after a failing image restoration + * @finish: Restore the previous state of the platform after the hibernation + * image has been created *or* put the platform into the normal operation + * mode after the hibernation (the same method is executed in both cases). + * Called right after the nonboot CPUs have been enabled and before + * thawing devices (runs with IRQs on). + * + * @prepare: Prepare the platform for entering the low power state. + * Called right after the hibernation image has been saved and before + * devices are prepared for entering the low power state. + * + * @enter: Put the system into the low power state after the hibernation image + * has been saved to disk. + * Called after the nonboot CPUs have been disabled and all of the low + * level devices have been shut down (runs with IRQs off). + * + * @leave: Perform the first stage of the cleanup after the system sleep state + * indicated by @set_target() has been left. + * Called right after the control has been passed from the boot kernel to + * the image kernel, before the nonboot CPUs are enabled and before devices + * are resumed. Executed with interrupts disabled. + * + * @pre_restore: Prepare system for the restoration from a hibernation image. + * Called right after devices have been frozen and before the nonboot + * CPUs are disabled (runs with IRQs on). + * + * @restore_cleanup: Clean up after a failing image restoration. + * Called right after the nonboot CPUs have been enabled and before + * thawing devices (runs with IRQs on). */ -struct hibernation_ops { +struct platform_hibernation_ops { + int (*begin)(void); + void (*end)(void); + int (*pre_snapshot)(void); + void (*finish)(void); int (*prepare)(void); int (*enter)(void); - void (*finish)(void); + void (*leave)(void); int (*pre_restore)(void); void (*restore_cleanup)(void); }; @@ -70,36 +207,24 @@ 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 void hibernation_set_ops(struct hibernation_ops *ops); +extern void hibernation_set_ops(struct platform_hibernation_ops *ops); extern int hibernate(void); #else /* CONFIG_HIBERNATION */ 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(struct hibernation_ops *ops) {} +static inline void hibernation_set_ops(struct platform_hibernation_ops *ops) {} static inline int hibernate(void) { return -ENOSYS; } #endif /* CONFIG_HIBERNATION */ #ifdef CONFIG_PM_SLEEP void save_processor_state(void); void restore_processor_state(void); -struct saved_context; -void __save_processor_state(struct saved_context *ctxt); -void __restore_processor_state(struct saved_context *ctxt); /* kernel/power/main.c */ -extern struct blocking_notifier_head pm_chain_head; - -static inline int register_pm_notifier(struct notifier_block *nb) -{ - return blocking_notifier_chain_register(&pm_chain_head, nb); -} - -static inline int unregister_pm_notifier(struct notifier_block *nb) -{ - return blocking_notifier_chain_unregister(&pm_chain_head, nb); -} +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 = \ @@ -130,4 +255,4 @@ static inline void register_nosave_region_late(unsigned long b, unsigned long e) } #endif -#endif /* _LINUX_SWSUSP_H */ +#endif /* _LINUX_SUSPEND_H */