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PM / Wakeup: Introduce wakeup source objects and event statistics (v3)

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Introduce struct wakeup_source for representing system wakeup sources
within the kernel and for collecting statistics related to them.
Make the recently introduced helper functions pm_wakeup_event(),
pm_stay_awake() and pm_relax() use struct wakeup_source objects
internally, so that wakeup statistics associated with wakeup devices
can be collected and reported in a consistent way (the definition of
pm_relax() is changed, which is harmless, because this function is
not called directly by anyone yet).  Introduce new wakeup-related
sysfs device attributes in /sys/devices/.../power for reporting the
device wakeup statistics.

Change the global wakeup events counters event_count and
events_in_progress into atomic variables, so that it is not necessary
to acquire a global spinlock in pm_wakeup_event(), pm_stay_awake()
and pm_relax(), which should allow us to avoid lock contention in
these functions on SMP systems with many wakeup devices.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Rafael J. Wysocki 2010-09-22 22:09:10 +02:00
parent 0702d9ee0f
commit 074037ec79
10 changed files with 762 additions and 131 deletions
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16
include/linux/pm.h
View file

@ -448,23 +448,24 @@ enum rpm_request {
RPM_REQ_RESUME,
};
struct wakeup_source;
struct dev_pm_info {
pm_message_t power_state;
unsigned int can_wakeup:1;
unsigned int should_wakeup:1;
unsigned async_suspend:1;
enum dpm_state status; /* Owned by the PM core */
spinlock_t lock;
#ifdef CONFIG_PM_SLEEP
struct list_head entry;
struct completion completion;
unsigned long wakeup_count;
struct wakeup_source *wakeup;
#endif
#ifdef CONFIG_PM_RUNTIME
struct timer_list suspend_timer;
unsigned long timer_expires;
struct work_struct work;
wait_queue_head_t wait_queue;
spinlock_t lock;
atomic_t usage_count;
atomic_t child_count;
unsigned int disable_depth:3;
@ -559,11 +560,6 @@ extern void __suspend_report_result(const char *function, void *fn, int ret);
} while (0)
extern void device_pm_wait_for_dev(struct device *sub, struct device *dev);
/* drivers/base/power/wakeup.c */
extern void pm_wakeup_event(struct device *dev, unsigned int msec);
extern void pm_stay_awake(struct device *dev);
extern void pm_relax(void);
#else /* !CONFIG_PM_SLEEP */
#define device_pm_lock() do {} while (0)
@ -577,10 +573,6 @@ static inline int dpm_suspend_start(pm_message_t state)
#define suspend_report_result(fn, ret) do {} while (0)
static inline void device_pm_wait_for_dev(struct device *a, struct device *b) {}
static inline void pm_wakeup_event(struct device *dev, unsigned int msec) {}
static inline void pm_stay_awake(struct device *dev) {}
static inline void pm_relax(void) {}
#endif /* !CONFIG_PM_SLEEP */
/* How to reorder dpm_list after device_move() */