123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109 |
- /* linux/include/linux/tick.h
- *
- * This file contains the structure definitions for tick related functions
- *
- */
- #ifndef _LINUX_TICK_H
- #define _LINUX_TICK_H
- #include <linux/clockchips.h>
- #ifdef CONFIG_GENERIC_CLOCKEVENTS
- enum tick_device_mode {
- TICKDEV_MODE_PERIODIC,
- TICKDEV_MODE_ONESHOT,
- };
- struct tick_device {
- struct clock_event_device *evtdev;
- enum tick_device_mode mode;
- };
- enum tick_nohz_mode {
- NOHZ_MODE_INACTIVE,
- NOHZ_MODE_LOWRES,
- NOHZ_MODE_HIGHRES,
- };
- /**
- * struct tick_sched - sched tick emulation and no idle tick control/stats
- * @sched_timer: hrtimer to schedule the periodic tick in high
- * resolution mode
- * @idle_tick: Store the last idle tick expiry time when the tick
- * timer is modified for idle sleeps. This is necessary
- * to resume the tick timer operation in the timeline
- * when the CPU returns from idle
- * @tick_stopped: Indicator that the idle tick has been stopped
- * @idle_jiffies: jiffies at the entry to idle for idle time accounting
- * @idle_calls: Total number of idle calls
- * @idle_sleeps: Number of idle calls, where the sched tick was stopped
- * @idle_entrytime: Time when the idle call was entered
- * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped
- */
- struct tick_sched {
- struct hrtimer sched_timer;
- unsigned long check_clocks;
- enum tick_nohz_mode nohz_mode;
- ktime_t idle_tick;
- int tick_stopped;
- unsigned long idle_jiffies;
- unsigned long idle_calls;
- unsigned long idle_sleeps;
- ktime_t idle_entrytime;
- ktime_t idle_sleeptime;
- unsigned long last_jiffies;
- unsigned long next_jiffies;
- ktime_t idle_expires;
- };
- extern void __init tick_init(void);
- extern int tick_is_oneshot_available(void);
- extern struct tick_device *tick_get_device(int cpu);
- # ifdef CONFIG_HIGH_RES_TIMERS
- extern int tick_init_highres(void);
- extern int tick_program_event(ktime_t expires, int force);
- extern void tick_setup_sched_timer(void);
- extern void tick_cancel_sched_timer(int cpu);
- # else
- static inline void tick_cancel_sched_timer(int cpu) { }
- # endif /* HIGHRES */
- # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
- extern struct tick_device *tick_get_broadcast_device(void);
- extern cpumask_t *tick_get_broadcast_mask(void);
- # ifdef CONFIG_TICK_ONESHOT
- extern cpumask_t *tick_get_broadcast_oneshot_mask(void);
- # endif
- # endif /* BROADCAST */
- # ifdef CONFIG_TICK_ONESHOT
- extern void tick_clock_notify(void);
- extern int tick_check_oneshot_change(int allow_nohz);
- extern struct tick_sched *tick_get_tick_sched(int cpu);
- # else
- static inline void tick_clock_notify(void) { }
- static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
- # endif
- #else /* CONFIG_GENERIC_CLOCKEVENTS */
- static inline void tick_init(void) { }
- static inline void tick_cancel_sched_timer(int cpu) { }
- static inline void tick_clock_notify(void) { }
- static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
- #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
- # ifdef CONFIG_NO_HZ
- extern void tick_nohz_stop_sched_tick(void);
- extern void tick_nohz_restart_sched_tick(void);
- extern void tick_nohz_update_jiffies(void);
- # else
- static inline void tick_nohz_stop_sched_tick(void) { }
- static inline void tick_nohz_restart_sched_tick(void) { }
- static inline void tick_nohz_update_jiffies(void) { }
- # endif /* !NO_HZ */
- #endif
|