Initial import

1 files changed, 568 insertions, 0 deletions

diff --git a/include/linux/suspend.h b/include/linux/suspend.h
new file mode 100644
index 000000000..9ae75219f
--- /dev/null
+++ b/include/linux/suspend.h
@@ -0,0 +1,568 @@
+#ifndef _LINUX_SUSPEND_H
+#define _LINUX_SUSPEND_H
+
+#include <linux/swap.h>
+#include <linux/notifier.h>
+#include <linux/init.h>
+#include <linux/pm.h>
+#include <linux/mm.h>
+#include <linux/freezer.h>
+#include <asm/errno.h>
+
+#ifdef CONFIG_VT
+extern void pm_set_vt_switch(int);
+#else
+static inline void pm_set_vt_switch(int do_switch)
+{
+}
+#endif
+
+#ifdef CONFIG_VT_CONSOLE_SLEEP
+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_FREEZE	((__force suspend_state_t) 1)
+#define PM_SUSPEND_STANDBY	((__force suspend_state_t) 2)
+#define PM_SUSPEND_MEM		((__force suspend_state_t) 3)
+#define PM_SUSPEND_MIN		PM_SUSPEND_FREEZE
+#define PM_SUSPEND_MAX		((__force suspend_state_t) 4)
+
+enum suspend_stat_step {
+	SUSPEND_FREEZE = 1,
+	SUSPEND_PREPARE,
+	SUSPEND_SUSPEND,
+	SUSPEND_SUSPEND_LATE,
+	SUSPEND_SUSPEND_NOIRQ,
+	SUSPEND_RESUME_NOIRQ,
+	SUSPEND_RESUME_EARLY,
+	SUSPEND_RESUME
+};
+
+struct suspend_stats {
+	int	success;
+	int	fail;
+	int	failed_freeze;
+	int	failed_prepare;
+	int	failed_suspend;
+	int	failed_suspend_late;
+	int	failed_suspend_noirq;
+	int	failed_resume;
+	int	failed_resume_early;
+	int	failed_resume_noirq;
+#define	REC_FAILED_NUM	2
+	int	last_failed_dev;
+	char	failed_devs[REC_FAILED_NUM][40];
+	int	last_failed_errno;
+	int	errno[REC_FAILED_NUM];
+	int	last_failed_step;
+	enum suspend_stat_step	failed_steps[REC_FAILED_NUM];
+};
+
+extern struct suspend_stats suspend_stats;
+
+static inline void dpm_save_failed_dev(const char *name)
+{
+	strlcpy(suspend_stats.failed_devs[suspend_stats.last_failed_dev],
+		name,
+		sizeof(suspend_stats.failed_devs[0]));
+	suspend_stats.last_failed_dev++;
+	suspend_stats.last_failed_dev %= REC_FAILED_NUM;
+}
+
+static inline void dpm_save_failed_errno(int err)
+{
+	suspend_stats.errno[suspend_stats.last_failed_errno] = err;
+	suspend_stats.last_failed_errno++;
+	suspend_stats.last_failed_errno %= REC_FAILED_NUM;
+}
+
+static inline void dpm_save_failed_step(enum suspend_stat_step step)
+{
+	suspend_stats.failed_steps[suspend_stats.last_failed_step] = step;
+	suspend_stats.last_failed_step++;
+	suspend_stats.last_failed_step %= REC_FAILED_NUM;
+}
+
+/**
+ * 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 device drivers' late suspend callbacks are executed.  It returns
+ *	0 on success or a negative error code otherwise, in which case the
+ *	system cannot enter the desired sleep state (@prepare_late(), @enter(),
+ *	and @wake() will not be called in that case).
+ *
+ * @prepare_late: Finish preparing the platform for entering the system sleep
+ *	state indicated by @begin().
+ *	@prepare_late is called before disabling nonboot CPUs and after
+ *	device drivers' late suspend callbacks have been executed.  It returns
+ *	0 on success or a negative error code otherwise, in which case the
+ *	system cannot enter the desired sleep state (@enter() will not be
+ *	executed).
+ *
+ * @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.
+ *
+ * @wake: Called when the system has just left a sleep state, right after
+ *	the nonboot CPUs have been enabled and before device drivers' early
+ *	resume callbacks are executed.
+ *	This callback is optional, but should be implemented by the platforms
+ *	that implement @prepare_late().  If implemented, it is always called
+ *	after @prepare_late and @enter(), even if one of them fails.
+ *
+ * @finish: Finish wake-up of the platform.
+ *	@finish is called right prior to calling device drivers' regular suspend
+ *	callbacks.
+ *	This callback is optional, but should be implemented by the platforms
+ *	that implement @prepare().  If implemented, it is always called after
+ *	@enter() and @wake(), even if any of them fails.  It is executed after
+ *	a failing @prepare.
+ *
+ * @suspend_again: Returns whether the system should suspend again (true) or
+ *	not (false). If the platform wants to poll sensors or execute some
+ *	code during suspended without invoking userspace and most of devices,
+ *	suspend_again callback is the place assuming that periodic-wakeup or
+ *	alarm-wakeup is already setup. This allows to execute some codes while
+ *	being kept suspended in the view of userland and devices.
+ *
+ * @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().  Accordingly, platforms implementing @begin()
+ *	should also provide a @end() which cleans up transitions aborted before
+ *	@enter().
+ *
+ * @recover: Recover the platform from a suspend failure.
+ *	Called by the PM core if the suspending of devices fails.
+ *	This callback is optional and should only be implemented by platforms
+ *	which require special recovery actions in that situation.
+ */
+struct platform_suspend_ops {
+	int (*valid)(suspend_state_t state);
+	int (*begin)(suspend_state_t state);
+	int (*prepare)(void);
+	int (*prepare_late)(void);
+	int (*enter)(suspend_state_t state);
+	void (*wake)(void);
+	void (*finish)(void);
+	bool (*suspend_again)(void);
+	void (*end)(void);
+	void (*recover)(void);
+};
+
+struct platform_freeze_ops {
+	int (*begin)(void);
+	int (*prepare)(void);
+	void (*restore)(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(const struct platform_suspend_ops *ops);
+extern int suspend_valid_only_mem(suspend_state_t state);
+
+/* Suspend-to-idle state machnine. */
+enum freeze_state {
+	FREEZE_STATE_NONE,      /* Not suspended/suspending. */
+	FREEZE_STATE_ENTER,     /* Enter suspend-to-idle. */
+	FREEZE_STATE_WAKE,      /* Wake up from suspend-to-idle. */
+};
+
+extern enum freeze_state __read_mostly suspend_freeze_state;
+
+static inline bool idle_should_freeze(void)
+{
+	return unlikely(suspend_freeze_state == FREEZE_STATE_ENTER);
+}
+
+extern void freeze_set_ops(const struct platform_freeze_ops *ops);
+extern void freeze_wake(void);
+
+/**
+ * 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(const struct platform_suspend_ops *ops) {}
+static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
+static inline bool idle_should_freeze(void) { return false; }
+static inline void freeze_set_ops(const struct platform_freeze_ops *ops) {}
+static inline void freeze_wake(void) {}
+#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
+ * occupied before the suspend are in use.
+ */
+struct pbe {
+	void *address;		/* address of the copy */
+	void *orig_address;	/* original address of a page */
+	struct pbe *next;
+};
+
+/* mm/page_alloc.c */
+extern void mark_free_pages(struct zone *zone);
+
+/**
+ * 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, except for @recover(), must be implemented.
+ *
+ * @begin: Tell the platform driver that we're starting hibernation.
+ *	Called right after shrinking memory and before freezing devices.
+ *
+ * @end: Called by the PM core right after resuming devices, to indicate to
+ *	the platform that the system has returned to the working state.
+ *
+ * @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).
+ *
+ * @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).
+ *
+ * @recover: Recover the platform from a failure to suspend devices.
+ *	Called by the PM core if the suspending of devices during hibernation
+ *	fails.  This callback is optional and should only be implemented by
+ *	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 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 */
+
+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 bool pm_wakeup_pending(void);
+extern void pm_system_wakeup(void);
+extern void pm_wakeup_clear(void);
+extern bool pm_get_wakeup_count(unsigned int *count, bool block);
+extern bool pm_save_wakeup_count(unsigned int count);
+extern void pm_wakep_autosleep_enabled(bool set);
+extern void pm_print_active_wakeup_sources(void);
+
+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 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
+
+enum {
+	TOI_CAN_HIBERNATE,
+	TOI_CAN_RESUME,
+	TOI_RESUME_DEVICE_OK,
+	TOI_NORESUME_SPECIFIED,
+	TOI_SANITY_CHECK_PROMPT,
+	TOI_CONTINUE_REQ,
+	TOI_RESUMED_BEFORE,
+	TOI_BOOT_TIME,
+	TOI_NOW_RESUMING,
+	TOI_IGNORE_LOGLEVEL,
+	TOI_TRYING_TO_RESUME,
+	TOI_LOADING_ALT_IMAGE,
+	TOI_STOP_RESUME,
+	TOI_IO_STOPPED,
+	TOI_NOTIFIERS_PREPARE,
+	TOI_CLUSTER_MODE,
+	TOI_BOOT_KERNEL,
+	TOI_DEVICE_HOTPLUG_LOCKED,
+};
+
+#ifdef CONFIG_TOI
+
+/* Used in init dir files */
+extern unsigned long toi_state;
+#define set_toi_state(bit) (set_bit(bit, &toi_state))
+#define clear_toi_state(bit) (clear_bit(bit, &toi_state))
+#define test_toi_state(bit) (test_bit(bit, &toi_state))
+extern int toi_running;
+
+#define test_action_state(bit) (test_bit(bit, &toi_bkd.toi_action))
+extern int try_tuxonice_hibernate(void);
+
+#else /* !CONFIG_TOI */
+
+#define toi_state		(0)
+#define set_toi_state(bit) do { } while (0)
+#define clear_toi_state(bit) do { } while (0)
+#define test_toi_state(bit) (0)
+#define toi_running (0)
+
+static inline int try_tuxonice_hibernate(void) { return 0; }
+#define test_action_state(bit) (0)
+
+#endif /* CONFIG_TOI */
+
+#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_TOI
+extern void try_tuxonice_resume(void);
+#else
+#define try_tuxonice_resume() do { } while (0)
+#endif
+
+extern int resume_attempted;
+extern int software_resume(void);
+
+static inline void check_resume_attempted(void)
+{
+	if (resume_attempted)
+		return;
+
+	software_resume();
+}
+#else
+#define check_resume_attempted() do { } while (0)
+#define resume_attempted (0)
+#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 */