074037ec79
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>
171 lines
4.9 KiB
C
171 lines
4.9 KiB
C
/*
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* pm_wakeup.h - Power management wakeup interface
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*
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* Copyright (C) 2008 Alan Stern
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* Copyright (C) 2010 Rafael J. Wysocki, Novell Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LINUX_PM_WAKEUP_H
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#define _LINUX_PM_WAKEUP_H
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#ifndef _DEVICE_H_
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# error "please don't include this file directly"
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#endif
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#include <linux/types.h>
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/**
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* struct wakeup_source - Representation of wakeup sources
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*
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* @total_time: Total time this wakeup source has been active.
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* @max_time: Maximum time this wakeup source has been continuously active.
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* @last_time: Monotonic clock when the wakeup source's was activated last time.
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* @event_count: Number of signaled wakeup events.
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* @active_count: Number of times the wakeup sorce was activated.
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* @relax_count: Number of times the wakeup sorce was deactivated.
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* @hit_count: Number of times the wakeup sorce might abort system suspend.
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* @active: Status of the wakeup source.
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*/
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struct wakeup_source {
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char *name;
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struct list_head entry;
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spinlock_t lock;
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struct timer_list timer;
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unsigned long timer_expires;
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ktime_t total_time;
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ktime_t max_time;
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ktime_t last_time;
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unsigned long event_count;
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unsigned long active_count;
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unsigned long relax_count;
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unsigned long hit_count;
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unsigned int active:1;
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};
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#ifdef CONFIG_PM_SLEEP
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/*
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* Changes to device_may_wakeup take effect on the next pm state change.
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*/
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static inline void device_set_wakeup_capable(struct device *dev, bool capable)
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{
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dev->power.can_wakeup = capable;
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}
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static inline bool device_can_wakeup(struct device *dev)
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{
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return dev->power.can_wakeup;
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}
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static inline bool device_may_wakeup(struct device *dev)
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{
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return dev->power.can_wakeup && !!dev->power.wakeup;
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}
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/* drivers/base/power/wakeup.c */
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extern struct wakeup_source *wakeup_source_create(const char *name);
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extern void wakeup_source_destroy(struct wakeup_source *ws);
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extern void wakeup_source_add(struct wakeup_source *ws);
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extern void wakeup_source_remove(struct wakeup_source *ws);
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extern struct wakeup_source *wakeup_source_register(const char *name);
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extern void wakeup_source_unregister(struct wakeup_source *ws);
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extern int device_wakeup_enable(struct device *dev);
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extern int device_wakeup_disable(struct device *dev);
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extern int device_init_wakeup(struct device *dev, bool val);
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extern int device_set_wakeup_enable(struct device *dev, bool enable);
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extern void __pm_stay_awake(struct wakeup_source *ws);
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extern void pm_stay_awake(struct device *dev);
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extern void __pm_relax(struct wakeup_source *ws);
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extern void pm_relax(struct device *dev);
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extern void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec);
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extern void pm_wakeup_event(struct device *dev, unsigned int msec);
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#else /* !CONFIG_PM_SLEEP */
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static inline void device_set_wakeup_capable(struct device *dev, bool capable)
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{
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dev->power.can_wakeup = capable;
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}
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static inline bool device_can_wakeup(struct device *dev)
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{
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return dev->power.can_wakeup;
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}
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static inline bool device_may_wakeup(struct device *dev)
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{
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return false;
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}
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static inline struct wakeup_source *wakeup_source_create(const char *name)
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{
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return NULL;
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}
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static inline void wakeup_source_destroy(struct wakeup_source *ws) {}
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static inline void wakeup_source_add(struct wakeup_source *ws) {}
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static inline void wakeup_source_remove(struct wakeup_source *ws) {}
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static inline struct wakeup_source *wakeup_source_register(const char *name)
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{
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return NULL;
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}
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static inline void wakeup_source_unregister(struct wakeup_source *ws) {}
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static inline int device_wakeup_enable(struct device *dev)
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{
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return -EINVAL;
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}
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static inline int device_wakeup_disable(struct device *dev)
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{
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return 0;
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}
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static inline int device_init_wakeup(struct device *dev, bool val)
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{
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dev->power.can_wakeup = val;
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return val ? -EINVAL : 0;
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}
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static inline int device_set_wakeup_enable(struct device *dev, bool enable)
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{
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return -EINVAL;
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}
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static inline void __pm_stay_awake(struct wakeup_source *ws) {}
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static inline void pm_stay_awake(struct device *dev) {}
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static inline void __pm_relax(struct wakeup_source *ws) {}
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static inline void pm_relax(struct device *dev) {}
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static inline void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec) {}
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static inline void pm_wakeup_event(struct device *dev, unsigned int msec) {}
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#endif /* !CONFIG_PM_SLEEP */
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#endif /* _LINUX_PM_WAKEUP_H */
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