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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 * @check_clocks: Notification mechanism about clocksource changes
28 * @nohz_mode: Mode - one state of tick_nohz_mode
29 * @inidle: Indicator that the CPU is in the tick idle mode
30 * @tick_stopped: Indicator that the idle tick has been stopped
31 * @idle_active: Indicator that the CPU is actively in the tick idle mode;
32 * it is reset during irq handling phases.
33 * @do_timer_lst: CPU was the last one doing do_timer before going idle
34 * @got_idle_tick: Tick timer function has run with @inidle set
35 * @last_tick: Store the last tick expiry time when the tick
36 * timer is modified for nohz sleeps. This is necessary
37 * to resume the tick timer operation in the timeline
38 * when the CPU returns from nohz sleep.
39 * @next_tick: Next tick to be fired when in dynticks mode.
40 * @idle_jiffies: jiffies at the entry to idle for idle time accounting
41 * @idle_calls: Total number of idle calls
42 * @idle_sleeps: Number of idle calls, where the sched tick was stopped
43 * @idle_entrytime: Time when the idle call was entered
44 * @idle_waketime: Time when the idle was interrupted
45 * @idle_exittime: Time when the idle state was left
46 * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped
47 * @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding
48 * @timer_expires: Anticipated timer expiration time (in case sched tick is stopped)
49 * @timer_expires_base: Base time clock monotonic for @timer_expires
50 * @next_timer: Expiry time of next expiring timer for debugging purpose only
51 * @tick_dep_mask: Tick dependency mask - is set, if someone needs the tick
52 * @last_tick_jiffies: Value of jiffies seen on last tick
53 * @stalled_jiffies: Number of stalled jiffies detected across ticks
54 */
55struct tick_sched {
56 struct hrtimer sched_timer;
57 unsigned long check_clocks;
58 enum tick_nohz_mode nohz_mode;
59
60 unsigned int inidle : 1;
61 unsigned int tick_stopped : 1;
62 unsigned int idle_active : 1;
63 unsigned int do_timer_last : 1;
64 unsigned int got_idle_tick : 1;
65
66 ktime_t last_tick;
67 ktime_t next_tick;
68 unsigned long idle_jiffies;
69 unsigned long idle_calls;
70 unsigned long idle_sleeps;
71 ktime_t idle_entrytime;
72 ktime_t idle_waketime;
73 ktime_t idle_exittime;
74 ktime_t idle_sleeptime;
75 ktime_t iowait_sleeptime;
76 unsigned long last_jiffies;
77 u64 timer_expires;
78 u64 timer_expires_base;
79 u64 next_timer;
80 ktime_t idle_expires;
81 atomic_t tick_dep_mask;
82 unsigned long last_tick_jiffies;
83 unsigned int stalled_jiffies;
84};
85
86extern struct tick_sched *tick_get_tick_sched(int cpu);
87
88extern void tick_setup_sched_timer(void);
89#if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS
90extern void tick_cancel_sched_timer(int cpu);
91#else
92static inline void tick_cancel_sched_timer(int cpu) { }
93#endif
94
95#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
96extern int __tick_broadcast_oneshot_control(enum tick_broadcast_state state);
97#else
98static inline int
99__tick_broadcast_oneshot_control(enum tick_broadcast_state state)
100{
101 return -EBUSY;
102}
103#endif
104
105#endif
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