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_waketime: Time when the idle was interrupted
43 * @idle_exittime: Time when the idle state was left
44 * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped
45 * @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding
46 * @sleep_length: Duration of the current idle sleep
47 * @do_timer_lst: CPU was the last one doing do_timer before going idle
50 struct hrtimer sched_timer
;
51 unsigned long check_clocks
;
52 enum tick_nohz_mode nohz_mode
;
56 unsigned long idle_jiffies
;
57 unsigned long idle_calls
;
58 unsigned long idle_sleeps
;
60 ktime_t idle_entrytime
;
61 ktime_t idle_waketime
;
62 ktime_t idle_exittime
;
63 ktime_t idle_sleeptime
;
64 ktime_t iowait_sleeptime
;
66 unsigned long last_jiffies
;
67 unsigned long next_jiffies
;
72 extern void __init
tick_init(void);
73 extern int tick_is_oneshot_available(void);
74 extern struct tick_device
*tick_get_device(int cpu
);
76 # ifdef CONFIG_HIGH_RES_TIMERS
77 extern int tick_init_highres(void);
78 extern int tick_program_event(ktime_t expires
, int force
);
79 extern void tick_setup_sched_timer(void);
82 # if defined CONFIG_NO_HZ || defined CONFIG_HIGH_RES_TIMERS
83 extern void tick_cancel_sched_timer(int cpu
);
85 static inline void tick_cancel_sched_timer(int cpu
) { }
88 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
89 extern struct tick_device
*tick_get_broadcast_device(void);
90 extern struct cpumask
*tick_get_broadcast_mask(void);
92 # ifdef CONFIG_TICK_ONESHOT
93 extern struct cpumask
*tick_get_broadcast_oneshot_mask(void);
96 # endif /* BROADCAST */
98 # ifdef CONFIG_TICK_ONESHOT
99 extern void tick_clock_notify(void);
100 extern int tick_check_oneshot_change(int allow_nohz
);
101 extern struct tick_sched
*tick_get_tick_sched(int cpu
);
102 extern void tick_check_idle(int cpu
);
103 extern int tick_oneshot_mode_active(void);
104 # ifndef arch_needs_cpu
105 # define arch_needs_cpu(cpu) (0)
108 static inline void tick_clock_notify(void) { }
109 static inline int tick_check_oneshot_change(int allow_nohz
) { return 0; }
110 static inline void tick_check_idle(int cpu
) { }
111 static inline int tick_oneshot_mode_active(void) { return 0; }
114 #else /* CONFIG_GENERIC_CLOCKEVENTS */
115 static inline void tick_init(void) { }
116 static inline void tick_cancel_sched_timer(int cpu
) { }
117 static inline void tick_clock_notify(void) { }
118 static inline int tick_check_oneshot_change(int allow_nohz
) { return 0; }
119 static inline void tick_check_idle(int cpu
) { }
120 static inline int tick_oneshot_mode_active(void) { return 0; }
121 #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
124 extern void tick_nohz_stop_sched_tick(int inidle
);
125 extern void tick_nohz_restart_sched_tick(void);
126 extern ktime_t
tick_nohz_get_sleep_length(void);
127 extern u64
get_cpu_idle_time_us(int cpu
, u64
*last_update_time
);
128 extern u64
get_cpu_iowait_time_us(int cpu
, u64
*last_update_time
);
130 static inline void tick_nohz_stop_sched_tick(int inidle
) { }
131 static inline void tick_nohz_restart_sched_tick(void) { }
132 static inline ktime_t
tick_nohz_get_sleep_length(void)
134 ktime_t len
= { .tv64
= NSEC_PER_SEC
/HZ
};
138 static inline u64
get_cpu_idle_time_us(int cpu
, u64
*unused
) { return -1; }
139 static inline u64
get_cpu_iowait_time_us(int cpu
, u64
*unused
) { return -1; }
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