1#ifndef _TICK_SCHED_H
 2#define _TICK_SCHED_H
 3
 4#include <linux/hrtimer.h>
 5
 6enum tick_device_mode {
 7	TICKDEV_MODE_PERIODIC,
 8	TICKDEV_MODE_ONESHOT,
 9};
10
11struct tick_device {
12	struct clock_event_device *evtdev;
13	enum tick_device_mode mode;
14};
15
16enum tick_nohz_mode {
17	NOHZ_MODE_INACTIVE,
18	NOHZ_MODE_LOWRES,
19	NOHZ_MODE_HIGHRES,
20};
21
22/**
23 * struct tick_sched - sched tick emulation and no idle tick control/stats
24 * @sched_timer:	hrtimer to schedule the periodic tick in high
25 *			resolution mode
26 * @last_tick:		Store the last tick expiry time when the tick
27 *			timer is modified for nohz sleeps. This is necessary
28 *			to resume the tick timer operation in the timeline
29 *			when the CPU returns from nohz sleep.
30 * @tick_stopped:	Indicator that the idle tick has been stopped
31 * @idle_jiffies:	jiffies at the entry to idle for idle time accounting
32 * @idle_calls:		Total number of idle calls
33 * @idle_sleeps:	Number of idle calls, where the sched tick was stopped
34 * @idle_entrytime:	Time when the idle call was entered
35 * @idle_waketime:	Time when the idle was interrupted
36 * @idle_exittime:	Time when the idle state was left
37 * @idle_sleeptime:	Sum of the time slept in idle with sched tick stopped
38 * @iowait_sleeptime:	Sum of the time slept in idle with sched tick stopped, with IO outstanding
39 * @sleep_length:	Duration of the current idle sleep
40 * @do_timer_lst:	CPU was the last one doing do_timer before going idle
41 */
42struct tick_sched {
43	struct hrtimer			sched_timer;
44	unsigned long			check_clocks;
45	enum tick_nohz_mode		nohz_mode;
46	ktime_t				last_tick;
47	int				inidle;
48	int				tick_stopped;
49	unsigned long			idle_jiffies;
50	unsigned long			idle_calls;
51	unsigned long			idle_sleeps;
52	int				idle_active;
53	ktime_t				idle_entrytime;
54	ktime_t				idle_waketime;
55	ktime_t				idle_exittime;
56	ktime_t				idle_sleeptime;
57	ktime_t				iowait_sleeptime;
58	ktime_t				sleep_length;
59	unsigned long			last_jiffies;
60	u64				next_timer;
61	ktime_t				idle_expires;
62	int				do_timer_last;
63	atomic_t			tick_dep_mask;
64};
65
66extern struct tick_sched *tick_get_tick_sched(int cpu);
67
68extern void tick_setup_sched_timer(void);
69#if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS
70extern void tick_cancel_sched_timer(int cpu);
71#else
72static inline void tick_cancel_sched_timer(int cpu) { }
73#endif
74
75#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
76extern int __tick_broadcast_oneshot_control(enum tick_broadcast_state state);
77#else
78static inline int
79__tick_broadcast_oneshot_control(enum tick_broadcast_state state)
80{
81	return -EBUSY;
82}
83#endif
84
85#endif