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Thomas Gleixner906568c2007-02-16 01:28:01 -08001/* 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
13enum tick_device_mode {
14 TICKDEV_MODE_PERIODIC,
15 TICKDEV_MODE_ONESHOT,
16};
17
18struct tick_device {
19 struct clock_event_device *evtdev;
20 enum tick_device_mode mode;
21};
22
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080023enum 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
Thomas Gleixner5df7fa12008-02-01 17:45:14 +010042 * @idle_waketime: Time when the idle was interrupted
43 * @idle_exittime: Time when the idle state was left
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080044 * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped
Len Brown4f86d3a2007-10-03 18:58:00 -040045 * @sleep_length: Duration of the current idle sleep
Thomas Gleixner27185012009-11-12 22:12:06 +010046 * @do_timer_lst: CPU was the last one doing do_timer before going idle
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080047 */
48struct tick_sched {
49 struct hrtimer sched_timer;
50 unsigned long check_clocks;
51 enum tick_nohz_mode nohz_mode;
52 ktime_t idle_tick;
Thomas Gleixnerb8f8c3c2008-07-18 17:27:28 +020053 int inidle;
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080054 int tick_stopped;
55 unsigned long idle_jiffies;
56 unsigned long idle_calls;
57 unsigned long idle_sleeps;
Venki Pallipadi6378ddb2008-01-30 13:30:04 +010058 int idle_active;
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080059 ktime_t idle_entrytime;
Thomas Gleixner5df7fa12008-02-01 17:45:14 +010060 ktime_t idle_waketime;
61 ktime_t idle_exittime;
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080062 ktime_t idle_sleeptime;
Venki Pallipadi6378ddb2008-01-30 13:30:04 +010063 ktime_t idle_lastupdate;
Len Brown4f86d3a2007-10-03 18:58:00 -040064 ktime_t sleep_length;
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080065 unsigned long last_jiffies;
66 unsigned long next_jiffies;
67 ktime_t idle_expires;
Thomas Gleixner27185012009-11-12 22:12:06 +010068 int do_timer_last;
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080069};
70
Thomas Gleixner906568c2007-02-16 01:28:01 -080071extern void __init tick_init(void);
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080072extern int tick_is_oneshot_available(void);
Ingo Molnar289f4802007-02-16 01:28:15 -080073extern struct tick_device *tick_get_device(int cpu);
Thomas Gleixner906568c2007-02-16 01:28:01 -080074
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080075# ifdef CONFIG_HIGH_RES_TIMERS
76extern int tick_init_highres(void);
77extern int tick_program_event(ktime_t expires, int force);
78extern void tick_setup_sched_timer(void);
Miao Xie3c4fbe52008-08-20 16:37:38 -070079# endif
80
81# if defined CONFIG_NO_HZ || defined CONFIG_HIGH_RES_TIMERS
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080082extern void tick_cancel_sched_timer(int cpu);
83# else
84static inline void tick_cancel_sched_timer(int cpu) { }
Miao Xie3c4fbe52008-08-20 16:37:38 -070085# endif
Thomas Gleixner906568c2007-02-16 01:28:01 -080086
Ingo Molnar289f4802007-02-16 01:28:15 -080087# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
88extern struct tick_device *tick_get_broadcast_device(void);
Rusty Russell6b954822009-01-01 10:12:25 +103089extern struct cpumask *tick_get_broadcast_mask(void);
Ingo Molnar289f4802007-02-16 01:28:15 -080090
91# ifdef CONFIG_TICK_ONESHOT
Rusty Russell6b954822009-01-01 10:12:25 +103092extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
Ingo Molnar289f4802007-02-16 01:28:15 -080093# endif
94
95# endif /* BROADCAST */
96
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080097# ifdef CONFIG_TICK_ONESHOT
98extern void tick_clock_notify(void);
99extern int tick_check_oneshot_change(int allow_nohz);
100extern struct tick_sched *tick_get_tick_sched(int cpu);
Thomas Gleixner719254f2008-10-17 09:59:47 +0200101extern void tick_check_idle(int cpu);
Thomas Gleixnercd6d95d2009-06-12 11:29:27 +0200102extern int tick_oneshot_mode_active(void);
Martin Schwidefsky3c5d92a2009-09-29 14:25:16 +0200103# ifndef arch_needs_cpu
104# define arch_needs_cpu(cpu) (0)
105# endif
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -0800106# else
107static inline void tick_clock_notify(void) { }
108static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
Thomas Gleixner719254f2008-10-17 09:59:47 +0200109static inline void tick_check_idle(int cpu) { }
Thomas Gleixnercd6d95d2009-06-12 11:29:27 +0200110static inline int tick_oneshot_mode_active(void) { return 0; }
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -0800111# endif
112
113#else /* CONFIG_GENERIC_CLOCKEVENTS */
Thomas Gleixner906568c2007-02-16 01:28:01 -0800114static inline void tick_init(void) { }
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -0800115static inline void tick_cancel_sched_timer(int cpu) { }
116static inline void tick_clock_notify(void) { }
117static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
Thomas Gleixner719254f2008-10-17 09:59:47 +0200118static inline void tick_check_idle(int cpu) { }
Thomas Gleixnercd6d95d2009-06-12 11:29:27 +0200119static inline int tick_oneshot_mode_active(void) { return 0; }
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -0800120#endif /* !CONFIG_GENERIC_CLOCKEVENTS */
Thomas Gleixner906568c2007-02-16 01:28:01 -0800121
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -0800122# ifdef CONFIG_NO_HZ
Thomas Gleixnerb8f8c3c2008-07-18 17:27:28 +0200123extern void tick_nohz_stop_sched_tick(int inidle);
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -0800124extern void tick_nohz_restart_sched_tick(void);
Len Brown4f86d3a2007-10-03 18:58:00 -0400125extern ktime_t tick_nohz_get_sleep_length(void);
Venki Pallipadi6378ddb2008-01-30 13:30:04 +0100126extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -0800127# else
Thomas Gleixnerb8f8c3c2008-07-18 17:27:28 +0200128static inline void tick_nohz_stop_sched_tick(int inidle) { }
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -0800129static inline void tick_nohz_restart_sched_tick(void) { }
Len Brown4f86d3a2007-10-03 18:58:00 -0400130static inline ktime_t tick_nohz_get_sleep_length(void)
131{
132 ktime_t len = { .tv64 = NSEC_PER_SEC/HZ };
133
134 return len;
135}
venkatesh.pallipadi@intel.com8083e4a2008-08-04 11:59:11 -0700136static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -0800137# endif /* !NO_HZ */
Thomas Gleixner906568c2007-02-16 01:28:01 -0800138
139#endif