1 /* linux/include/linux/tick.h
2 *
3 * This file contains the structure definitions for tick related functions
4 *
5 */
6 #ifndef _LINUX_TICK_H
7 #define _LINUX_TICK_H
8
9 #include <linux/clockchips.h>
10
11 #ifdef CONFIG_GENERIC_CLOCKEVENTS
12
13 enum tick_device_mode {
14 TICKDEV_MODE_PERIODIC,
15 TICKDEV_MODE_ONESHOT,
16 };
17
18 struct tick_device {
19 struct clock_event_device *evtdev;
20 enum tick_device_mode mode;
21 };
22
23 enum tick_nohz_mode {
24 NOHZ_MODE_INACTIVE,
25 NOHZ_MODE_LOWRES,
26 NOHZ_MODE_HIGHRES,
27 };
28
29 /**
30 * struct tick_sched - sched tick emulation and no idle tick control/stats
31 * @sched_timer: hrtimer to schedule the periodic tick in high
32 * resolution mode
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 * @sleep_length: Duration of the current idle sleep
46 */
47 struct tick_sched {
48 struct hrtimer sched_timer;
49 unsigned long check_clocks;
50 enum tick_nohz_mode nohz_mode;
51 ktime_t idle_tick;
52 int inidle;
53 int tick_stopped;
54 unsigned long idle_jiffies;
55 unsigned long idle_calls;
56 unsigned long idle_sleeps;
57 int idle_active;
58 ktime_t idle_entrytime;
59 ktime_t idle_waketime;
60 ktime_t idle_exittime;
61 ktime_t idle_sleeptime;
62 ktime_t idle_lastupdate;
63 ktime_t sleep_length;
64 unsigned long last_jiffies;
65 unsigned long next_jiffies;
66 ktime_t idle_expires;
67 };
68
69 extern void __init tick_init(void);
70 extern int tick_is_oneshot_available(void);
71 extern struct tick_device *tick_get_device(int cpu);
72
73 # ifdef CONFIG_HIGH_RES_TIMERS
74 extern int tick_init_highres(void);
75 extern int tick_program_event(ktime_t expires, int force);
76 extern void tick_setup_sched_timer(void);
77 # endif
78
79 # if defined CONFIG_NO_HZ || defined CONFIG_HIGH_RES_TIMERS
80 extern void tick_cancel_sched_timer(int cpu);
81 # else
82 static inline void tick_cancel_sched_timer(int cpu) { }
83 # endif
84
85 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
86 extern struct tick_device *tick_get_broadcast_device(void);
87 extern struct cpumask *tick_get_broadcast_mask(void);
88
89 # ifdef CONFIG_TICK_ONESHOT
90 extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
91 # endif
92
93 # endif /* BROADCAST */
94
95 # ifdef CONFIG_TICK_ONESHOT
96 extern void tick_clock_notify(void);
97 extern int tick_check_oneshot_change(int allow_nohz);
98 extern struct tick_sched *tick_get_tick_sched(int cpu);
99 extern void tick_check_idle(int cpu);
100 extern int tick_oneshot_mode_active(void);
101 # else
102 static inline void tick_clock_notify(void) { }
103 static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
104 static inline void tick_check_idle(int cpu) { }
105 static inline int tick_oneshot_mode_active(void) { return 0; }
106 # endif
107
108 #else /* CONFIG_GENERIC_CLOCKEVENTS */
109 static inline void tick_init(void) { }
110 static inline void tick_cancel_sched_timer(int cpu) { }
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; }
115 #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
116
117 # ifdef CONFIG_NO_HZ
118 extern void tick_nohz_stop_sched_tick(int inidle);
119 extern void tick_nohz_restart_sched_tick(void);
120 extern ktime_t tick_nohz_get_sleep_length(void);
121 extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
122 # else
123 static inline void tick_nohz_stop_sched_tick(int inidle) { }
124 static inline void tick_nohz_restart_sched_tick(void) { }
125 static inline ktime_t tick_nohz_get_sleep_length(void)
126 {
127 ktime_t len = { .tv64 = NSEC_PER_SEC/HZ };
128
129 return len;
130 }
131 static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
132 # endif /* !NO_HZ */
133
134 #endif
135
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