1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _TICK_SCHED_H
 3#define _TICK_SCHED_H
 4
 5#include <linux/hrtimer.h>
 6
 7enum tick_device_mode {
 8	TICKDEV_MODE_PERIODIC,
 9	TICKDEV_MODE_ONESHOT,
10};
11
12struct tick_device {
13	struct clock_event_device *evtdev;
14	enum tick_device_mode mode;
15};
16
17enum tick_nohz_mode {
18	NOHZ_MODE_INACTIVE,
19	NOHZ_MODE_LOWRES,
20	NOHZ_MODE_HIGHRES,
21};
22
23/**
24 * struct tick_sched - sched tick emulation and no idle tick control/stats
25 * @sched_timer:	hrtimer to schedule the periodic tick in high
26 *			resolution mode
27 * @last_tick:		Store the last tick expiry time when the tick
28 *			timer is modified for nohz sleeps. This is necessary
29 *			to resume the tick timer operation in the timeline
30 *			when the CPU returns from nohz sleep.
31 * @next_tick:		Next tick to be fired when in dynticks mode.
32 * @tick_stopped:	Indicator that the idle tick has been stopped
33 * @idle_jiffies:	jiffies at the entry to idle for idle time accounting
34 * @idle_calls:		Total number of idle calls
35 * @idle_sleeps:	Number of idle calls, where the sched tick was stopped
36 * @idle_entrytime:	Time when the idle call was entered
37 * @idle_waketime:	Time when the idle was interrupted
38 * @idle_exittime:	Time when the idle state was left
39 * @idle_sleeptime:	Sum of the time slept in idle with sched tick stopped
40 * @iowait_sleeptime:	Sum of the time slept in idle with sched tick stopped, with IO outstanding
41 * @timer_expires:	Anticipated timer expiration time (in case sched tick is stopped)
42 * @timer_expires_base:	Base time clock monotonic for @timer_expires
43 * @do_timer_lst:	CPU was the last one doing do_timer before going idle
44 * @got_idle_tick:	Tick timer function has run with @inidle set
45 */
46struct tick_sched {
47	struct hrtimer			sched_timer;
48	unsigned long			check_clocks;
49	enum tick_nohz_mode		nohz_mode;
50
51	unsigned int			inidle		: 1;
52	unsigned int			tick_stopped	: 1;
53	unsigned int			idle_active	: 1;
54	unsigned int			do_timer_last	: 1;
55	unsigned int			got_idle_tick	: 1;
56
57	ktime_t				last_tick;
58	ktime_t				next_tick;
59	unsigned long			idle_jiffies;
60	unsigned long			idle_calls;
61	unsigned long			idle_sleeps;
62	ktime_t				idle_entrytime;
63	ktime_t				idle_waketime;
64	ktime_t				idle_exittime;
65	ktime_t				idle_sleeptime;
66	ktime_t				iowait_sleeptime;
67	unsigned long			last_jiffies;
68	u64				timer_expires;
69	u64				timer_expires_base;
70	u64				next_timer;
71	ktime_t				idle_expires;
72	atomic_t			tick_dep_mask;
73};
74
75extern struct tick_sched *tick_get_tick_sched(int cpu);
76
77extern void tick_setup_sched_timer(void);
78#if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS
79extern void tick_cancel_sched_timer(int cpu);
80#else
81static inline void tick_cancel_sched_timer(int cpu) { }
82#endif
83
84#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
85extern int __tick_broadcast_oneshot_control(enum tick_broadcast_state state);
86#else
87static inline int
88__tick_broadcast_oneshot_control(enum tick_broadcast_state state)
89{
90	return -EBUSY;
91}
92#endif
93
94#endif