1 /* linux/include/linux/tick.h
3 * This file contains the structure definitions for tick related functions
9 #include <linux/clockchips.h>
10 #include <linux/irqflags.h>
11 #include <linux/percpu.h>
12 #include <linux/hrtimer.h>
14 #ifdef CONFIG_GENERIC_CLOCKEVENTS
16 enum tick_device_mode
{
17 TICKDEV_MODE_PERIODIC
,
22 struct clock_event_device
*evtdev
;
23 enum tick_device_mode mode
;
33 * struct tick_sched - sched tick emulation and no idle tick control/stats
34 * @sched_timer: hrtimer to schedule the periodic tick in high
36 * @last_tick: Store the last tick expiry time when the tick
37 * timer is modified for nohz sleeps. This is necessary
38 * to resume the tick timer operation in the timeline
39 * when the CPU returns from nohz sleep.
40 * @tick_stopped: Indicator that the idle tick has been stopped
41 * @idle_jiffies: jiffies at the entry to idle for idle time accounting
42 * @idle_calls: Total number of idle calls
43 * @idle_sleeps: Number of idle calls, where the sched tick was stopped
44 * @idle_entrytime: Time when the idle call was entered
45 * @idle_waketime: Time when the idle was interrupted
46 * @idle_exittime: Time when the idle state was left
47 * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped
48 * @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding
49 * @sleep_length: Duration of the current idle sleep
50 * @do_timer_lst: CPU was the last one doing do_timer before going idle
53 struct hrtimer sched_timer
;
54 unsigned long check_clocks
;
55 enum tick_nohz_mode nohz_mode
;
59 unsigned long idle_jiffies
;
60 unsigned long idle_calls
;
61 unsigned long idle_sleeps
;
63 ktime_t idle_entrytime
;
64 ktime_t idle_waketime
;
65 ktime_t idle_exittime
;
66 ktime_t idle_sleeptime
;
67 ktime_t iowait_sleeptime
;
69 unsigned long last_jiffies
;
70 unsigned long next_jiffies
;
75 extern void __init
tick_init(void);
76 extern int tick_is_oneshot_available(void);
77 extern struct tick_device
*tick_get_device(int cpu
);
79 # ifdef CONFIG_HIGH_RES_TIMERS
80 extern int tick_init_highres(void);
81 extern int tick_program_event(ktime_t expires
, int force
);
82 extern void tick_setup_sched_timer(void);
85 # if defined CONFIG_NO_HZ || defined CONFIG_HIGH_RES_TIMERS
86 extern void tick_cancel_sched_timer(int cpu
);
88 static inline void tick_cancel_sched_timer(int cpu
) { }
91 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
92 extern struct tick_device
*tick_get_broadcast_device(void);
93 extern struct cpumask
*tick_get_broadcast_mask(void);
95 # ifdef CONFIG_TICK_ONESHOT
96 extern struct cpumask
*tick_get_broadcast_oneshot_mask(void);
99 # endif /* BROADCAST */
101 # ifdef CONFIG_TICK_ONESHOT
102 extern void tick_clock_notify(void);
103 extern int tick_check_oneshot_change(int allow_nohz
);
104 extern struct tick_sched
*tick_get_tick_sched(int cpu
);
105 extern void tick_check_idle(int cpu
);
106 extern int tick_oneshot_mode_active(void);
107 # ifndef arch_needs_cpu
108 # define arch_needs_cpu(cpu) (0)
111 static inline void tick_clock_notify(void) { }
112 static inline int tick_check_oneshot_change(int allow_nohz
) { return 0; }
113 static inline void tick_check_idle(int cpu
) { }
114 static inline int tick_oneshot_mode_active(void) { return 0; }
117 #else /* CONFIG_GENERIC_CLOCKEVENTS */
118 static inline void tick_init(void) { }
119 static inline void tick_cancel_sched_timer(int cpu
) { }
120 static inline void tick_clock_notify(void) { }
121 static inline int tick_check_oneshot_change(int allow_nohz
) { return 0; }
122 static inline void tick_check_idle(int cpu
) { }
123 static inline int tick_oneshot_mode_active(void) { return 0; }
124 #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
127 DECLARE_PER_CPU(struct tick_sched
, tick_cpu_sched
);
129 static inline int tick_nohz_tick_stopped(void)
131 return __this_cpu_read(tick_cpu_sched
.tick_stopped
);
134 extern void tick_nohz_idle_enter(void);
135 extern void tick_nohz_idle_exit(void);
136 extern void tick_nohz_irq_exit(void);
137 extern ktime_t
tick_nohz_get_sleep_length(void);
138 extern u64
get_cpu_idle_time_us(int cpu
, u64
*last_update_time
);
139 extern u64
get_cpu_iowait_time_us(int cpu
, u64
*last_update_time
);
141 # else /* !CONFIG_NO_HZ */
142 static inline int tick_nohz_tick_stopped(void)
147 static inline void tick_nohz_idle_enter(void) { }
148 static inline void tick_nohz_idle_exit(void) { }
150 static inline ktime_t
tick_nohz_get_sleep_length(void)
152 ktime_t len
= { .tv64
= NSEC_PER_SEC
/HZ
};
156 static inline u64
get_cpu_idle_time_us(int cpu
, u64
*unused
) { return -1; }
157 static inline u64
get_cpu_iowait_time_us(int cpu
, u64
*unused
) { return -1; }
160 # ifdef CONFIG_CPU_IDLE_GOV_MENU
161 extern void menu_hrtimer_cancel(void);
163 static inline void menu_hrtimer_cancel(void) {}
164 # endif /* CONFIG_CPU_IDLE_GOV_MENU */