Commit | Line | Data |
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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> | |
2bbb6817 | 10 | #include <linux/irqflags.h> |
906568c9 TG |
11 | |
12 | #ifdef CONFIG_GENERIC_CLOCKEVENTS | |
13 | ||
14 | enum tick_device_mode { | |
15 | TICKDEV_MODE_PERIODIC, | |
16 | TICKDEV_MODE_ONESHOT, | |
17 | }; | |
18 | ||
19 | struct tick_device { | |
20 | struct clock_event_device *evtdev; | |
21 | enum tick_device_mode mode; | |
22 | }; | |
23 | ||
79bf2bb3 TG |
24 | enum tick_nohz_mode { |
25 | NOHZ_MODE_INACTIVE, | |
26 | NOHZ_MODE_LOWRES, | |
27 | NOHZ_MODE_HIGHRES, | |
28 | }; | |
29 | ||
30 | /** | |
31 | * struct tick_sched - sched tick emulation and no idle tick control/stats | |
32 | * @sched_timer: hrtimer to schedule the periodic tick in high | |
33 | * resolution mode | |
f5d411c9 FW |
34 | * @last_tick: Store the last tick expiry time when the tick |
35 | * timer is modified for nohz sleeps. This is necessary | |
79bf2bb3 | 36 | * to resume the tick timer operation in the timeline |
f5d411c9 | 37 | * when the CPU returns from nohz sleep. |
79bf2bb3 TG |
38 | * @tick_stopped: Indicator that the idle tick has been stopped |
39 | * @idle_jiffies: jiffies at the entry to idle for idle time accounting | |
40 | * @idle_calls: Total number of idle calls | |
41 | * @idle_sleeps: Number of idle calls, where the sched tick was stopped | |
42 | * @idle_entrytime: Time when the idle call was entered | |
5df7fa1c TG |
43 | * @idle_waketime: Time when the idle was interrupted |
44 | * @idle_exittime: Time when the idle state was left | |
79bf2bb3 | 45 | * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped |
0224cf4c | 46 | * @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding |
4f86d3a8 | 47 | * @sleep_length: Duration of the current idle sleep |
27185016 | 48 | * @do_timer_lst: CPU was the last one doing do_timer before going idle |
79bf2bb3 TG |
49 | */ |
50 | struct tick_sched { | |
51 | struct hrtimer sched_timer; | |
52 | unsigned long check_clocks; | |
53 | enum tick_nohz_mode nohz_mode; | |
f5d411c9 | 54 | ktime_t last_tick; |
b8f8c3cf | 55 | int inidle; |
79bf2bb3 TG |
56 | int tick_stopped; |
57 | unsigned long idle_jiffies; | |
58 | unsigned long idle_calls; | |
59 | unsigned long idle_sleeps; | |
6378ddb5 | 60 | int idle_active; |
79bf2bb3 | 61 | ktime_t idle_entrytime; |
5df7fa1c TG |
62 | ktime_t idle_waketime; |
63 | ktime_t idle_exittime; | |
79bf2bb3 | 64 | ktime_t idle_sleeptime; |
0224cf4c | 65 | ktime_t iowait_sleeptime; |
4f86d3a8 | 66 | ktime_t sleep_length; |
79bf2bb3 TG |
67 | unsigned long last_jiffies; |
68 | unsigned long next_jiffies; | |
69 | ktime_t idle_expires; | |
27185016 | 70 | int do_timer_last; |
79bf2bb3 TG |
71 | }; |
72 | ||
906568c9 | 73 | extern void __init tick_init(void); |
79bf2bb3 | 74 | extern int tick_is_oneshot_available(void); |
289f480a | 75 | extern struct tick_device *tick_get_device(int cpu); |
79bf2bb3 TG |
76 | |
77 | # ifdef CONFIG_HIGH_RES_TIMERS | |
78 | extern int tick_init_highres(void); | |
79 | extern int tick_program_event(ktime_t expires, int force); | |
80 | extern void tick_setup_sched_timer(void); | |
3c4fbe5e MX |
81 | # endif |
82 | ||
83 | # if defined CONFIG_NO_HZ || defined CONFIG_HIGH_RES_TIMERS | |
79bf2bb3 TG |
84 | extern void tick_cancel_sched_timer(int cpu); |
85 | # else | |
86 | static inline void tick_cancel_sched_timer(int cpu) { } | |
3c4fbe5e | 87 | # endif |
906568c9 | 88 | |
289f480a IM |
89 | # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
90 | extern struct tick_device *tick_get_broadcast_device(void); | |
6b954823 | 91 | extern struct cpumask *tick_get_broadcast_mask(void); |
289f480a IM |
92 | |
93 | # ifdef CONFIG_TICK_ONESHOT | |
6b954823 | 94 | extern struct cpumask *tick_get_broadcast_oneshot_mask(void); |
289f480a IM |
95 | # endif |
96 | ||
97 | # endif /* BROADCAST */ | |
98 | ||
79bf2bb3 TG |
99 | # ifdef CONFIG_TICK_ONESHOT |
100 | extern void tick_clock_notify(void); | |
101 | extern int tick_check_oneshot_change(int allow_nohz); | |
102 | extern struct tick_sched *tick_get_tick_sched(int cpu); | |
719254fa | 103 | extern void tick_check_idle(int cpu); |
cd6d95d8 | 104 | extern int tick_oneshot_mode_active(void); |
3c5d92a0 MS |
105 | # ifndef arch_needs_cpu |
106 | # define arch_needs_cpu(cpu) (0) | |
107 | # endif | |
79bf2bb3 TG |
108 | # else |
109 | static inline void tick_clock_notify(void) { } | |
110 | static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } | |
719254fa | 111 | static inline void tick_check_idle(int cpu) { } |
cd6d95d8 | 112 | static inline int tick_oneshot_mode_active(void) { return 0; } |
79bf2bb3 | 113 | # endif |
906568c9 | 114 | |
79bf2bb3 | 115 | #else /* CONFIG_GENERIC_CLOCKEVENTS */ |
906568c9 | 116 | static inline void tick_init(void) { } |
79bf2bb3 TG |
117 | static inline void tick_cancel_sched_timer(int cpu) { } |
118 | static inline void tick_clock_notify(void) { } | |
119 | static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } | |
719254fa | 120 | static inline void tick_check_idle(int cpu) { } |
cd6d95d8 | 121 | static inline int tick_oneshot_mode_active(void) { return 0; } |
79bf2bb3 | 122 | #endif /* !CONFIG_GENERIC_CLOCKEVENTS */ |
906568c9 | 123 | |
79bf2bb3 | 124 | # ifdef CONFIG_NO_HZ |
1268fbc7 | 125 | extern void tick_nohz_idle_enter(void); |
280f0677 FW |
126 | extern void tick_nohz_idle_exit(void); |
127 | extern void tick_nohz_irq_exit(void); | |
4f86d3a8 | 128 | extern ktime_t tick_nohz_get_sleep_length(void); |
6378ddb5 | 129 | extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time); |
0224cf4c | 130 | extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time); |
79bf2bb3 | 131 | # else |
2bbb6817 FW |
132 | static inline void tick_nohz_idle_enter(void) { } |
133 | static inline void tick_nohz_idle_exit(void) { } | |
280f0677 | 134 | |
4f86d3a8 LB |
135 | static inline ktime_t tick_nohz_get_sleep_length(void) |
136 | { | |
137 | ktime_t len = { .tv64 = NSEC_PER_SEC/HZ }; | |
138 | ||
139 | return len; | |
140 | } | |
8083e4ad | 141 | static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; } |
0224cf4c | 142 | static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; } |
79bf2bb3 | 143 | # endif /* !NO_HZ */ |
906568c9 TG |
144 | |
145 | #endif |