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906568c9 TG |
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 | ||
79bf2bb3 TG |
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_sleeptime: Sum of the time slept in idle with sched tick stopped | |
4f86d3a8 | 43 | * @sleep_length: Duration of the current idle sleep |
79bf2bb3 TG |
44 | */ |
45 | struct tick_sched { | |
46 | struct hrtimer sched_timer; | |
47 | unsigned long check_clocks; | |
48 | enum tick_nohz_mode nohz_mode; | |
49 | ktime_t idle_tick; | |
50 | int tick_stopped; | |
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; | |
4f86d3a8 | 56 | ktime_t sleep_length; |
79bf2bb3 TG |
57 | unsigned long last_jiffies; |
58 | unsigned long next_jiffies; | |
59 | ktime_t idle_expires; | |
60 | }; | |
61 | ||
906568c9 | 62 | extern void __init tick_init(void); |
79bf2bb3 | 63 | extern int tick_is_oneshot_available(void); |
289f480a | 64 | extern struct tick_device *tick_get_device(int cpu); |
79bf2bb3 TG |
65 | |
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); | |
71 | # else | |
72 | static inline void tick_cancel_sched_timer(int cpu) { } | |
73 | # endif /* HIGHRES */ | |
906568c9 | 74 | |
289f480a IM |
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); | |
78 | ||
79 | # ifdef CONFIG_TICK_ONESHOT | |
80 | extern cpumask_t *tick_get_broadcast_oneshot_mask(void); | |
81 | # endif | |
82 | ||
83 | # endif /* BROADCAST */ | |
84 | ||
79bf2bb3 TG |
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); | |
89 | # else | |
90 | static inline void tick_clock_notify(void) { } | |
91 | static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } | |
92 | # endif | |
906568c9 | 93 | |
79bf2bb3 | 94 | #else /* CONFIG_GENERIC_CLOCKEVENTS */ |
906568c9 | 95 | static inline void tick_init(void) { } |
79bf2bb3 TG |
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 */ | |
906568c9 | 100 | |
79bf2bb3 TG |
101 | # ifdef CONFIG_NO_HZ |
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); | |
4f86d3a8 | 105 | extern ktime_t tick_nohz_get_sleep_length(void); |
79bf2bb3 TG |
106 | # else |
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) { } | |
4f86d3a8 LB |
110 | static inline ktime_t tick_nohz_get_sleep_length(void) |
111 | { | |
112 | ktime_t len = { .tv64 = NSEC_PER_SEC/HZ }; | |
113 | ||
114 | return len; | |
115 | } | |
79bf2bb3 | 116 | # endif /* !NO_HZ */ |
906568c9 TG |
117 | |
118 | #endif |