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1 /* linux/include/linux/tick.h
3 * This file contains the structure definitions for tick related functions
9 #include <linux/clockchips.h>
11 #ifdef CONFIG_GENERIC_CLOCKEVENTS
13 enum tick_device_mode
{
14 TICKDEV_MODE_PERIODIC
,
19 struct clock_event_device
*evtdev
;
20 enum tick_device_mode mode
;
30 * struct tick_sched - sched tick emulation and no idle tick control/stats
31 * @sched_timer: hrtimer to schedule the periodic tick in high
33 * @idle_tick: Store the last idle tick expiry time when the tick
34 * timer is modified for idle sleeps. This is necessary
35 * to resume the tick timer operation in the timeline
36 * when the CPU returns from idle
37 * @tick_stopped: Indicator that the idle tick has been stopped
38 * @idle_jiffies: jiffies at the entry to idle for idle time accounting
39 * @idle_calls: Total number of idle calls
40 * @idle_sleeps: Number of idle calls, where the sched tick was stopped
41 * @idle_entrytime: Time when the idle call was entered
42 * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped
43 * @sleep_length: Duration of the current idle sleep
46 struct hrtimer sched_timer
;
47 unsigned long check_clocks
;
48 enum tick_nohz_mode nohz_mode
;
51 unsigned long idle_jiffies
;
52 unsigned long idle_calls
;
53 unsigned long idle_sleeps
;
54 ktime_t idle_entrytime
;
55 ktime_t idle_sleeptime
;
57 unsigned long last_jiffies
;
58 unsigned long next_jiffies
;
62 extern void __init
tick_init(void);
63 extern int tick_is_oneshot_available(void);
64 extern struct tick_device
*tick_get_device(int cpu
);
66 # ifdef CONFIG_HIGH_RES_TIMERS
67 extern int tick_init_highres(void);
68 extern int tick_program_event(ktime_t expires
, int force
);
69 extern void tick_setup_sched_timer(void);
70 extern void tick_cancel_sched_timer(int cpu
);
72 static inline void tick_cancel_sched_timer(int cpu
) { }
75 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
76 extern struct tick_device
*tick_get_broadcast_device(void);
77 extern cpumask_t
*tick_get_broadcast_mask(void);
79 # ifdef CONFIG_TICK_ONESHOT
80 extern cpumask_t
*tick_get_broadcast_oneshot_mask(void);
83 # endif /* BROADCAST */
85 # ifdef CONFIG_TICK_ONESHOT
86 extern void tick_clock_notify(void);
87 extern int tick_check_oneshot_change(int allow_nohz
);
88 extern struct tick_sched
*tick_get_tick_sched(int cpu
);
90 static inline void tick_clock_notify(void) { }
91 static inline int tick_check_oneshot_change(int allow_nohz
) { return 0; }
94 #else /* CONFIG_GENERIC_CLOCKEVENTS */
95 static inline void tick_init(void) { }
96 static inline void tick_cancel_sched_timer(int cpu
) { }
97 static inline void tick_clock_notify(void) { }
98 static inline int tick_check_oneshot_change(int allow_nohz
) { return 0; }
99 #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
102 extern void tick_nohz_stop_sched_tick(void);
103 extern void tick_nohz_restart_sched_tick(void);
104 extern void tick_nohz_update_jiffies(void);
105 extern ktime_t
tick_nohz_get_sleep_length(void);
107 static inline void tick_nohz_stop_sched_tick(void) { }
108 static inline void tick_nohz_restart_sched_tick(void) { }
109 static inline void tick_nohz_update_jiffies(void) { }
110 static inline ktime_t
tick_nohz_get_sleep_length(void)
112 ktime_t len
= { .tv64
= NSEC_PER_SEC
/HZ
};