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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * tick internal variable and functions used by low/high res code
4 */
5#include <linux/hrtimer.h>
6#include <linux/tick.h>
7
8#include "timekeeping.h"
9#include "tick-sched.h"
10
11#ifdef CONFIG_GENERIC_CLOCKEVENTS
12
13# define TICK_DO_TIMER_NONE -1
14# define TICK_DO_TIMER_BOOT -2
15
16DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
17extern ktime_t tick_next_period;
18extern ktime_t tick_period;
19extern int tick_do_timer_cpu __read_mostly;
20
21extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
22extern void tick_handle_periodic(struct clock_event_device *dev);
23extern void tick_check_new_device(struct clock_event_device *dev);
24extern void tick_shutdown(unsigned int cpu);
25extern void tick_suspend(void);
26extern void tick_resume(void);
27extern bool tick_check_replacement(struct clock_event_device *curdev,
28 struct clock_event_device *newdev);
29extern void tick_install_replacement(struct clock_event_device *dev);
30extern int tick_is_oneshot_available(void);
31extern struct tick_device *tick_get_device(int cpu);
32
33extern int clockevents_tick_resume(struct clock_event_device *dev);
34/* Check, if the device is functional or a dummy for broadcast */
35static inline int tick_device_is_functional(struct clock_event_device *dev)
36{
37 return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
38}
39
40static inline enum clock_event_state clockevent_get_state(struct clock_event_device *dev)
41{
42 return dev->state_use_accessors;
43}
44
45static inline void clockevent_set_state(struct clock_event_device *dev,
46 enum clock_event_state state)
47{
48 dev->state_use_accessors = state;
49}
50
51extern void clockevents_shutdown(struct clock_event_device *dev);
52extern void clockevents_exchange_device(struct clock_event_device *old,
53 struct clock_event_device *new);
54extern void clockevents_switch_state(struct clock_event_device *dev,
55 enum clock_event_state state);
56extern int clockevents_program_event(struct clock_event_device *dev,
57 ktime_t expires, bool force);
58extern void clockevents_handle_noop(struct clock_event_device *dev);
59extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq);
60extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
61
62/* Broadcasting support */
63# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
64extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
65extern void tick_install_broadcast_device(struct clock_event_device *dev);
66extern int tick_is_broadcast_device(struct clock_event_device *dev);
67extern void tick_suspend_broadcast(void);
68extern void tick_resume_broadcast(void);
69extern bool tick_resume_check_broadcast(void);
70extern void tick_broadcast_init(void);
71extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
72extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
73extern struct tick_device *tick_get_broadcast_device(void);
74extern struct cpumask *tick_get_broadcast_mask(void);
75# else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */
76static inline void tick_install_broadcast_device(struct clock_event_device *dev) { }
77static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; }
78static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; }
79static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
80static inline void tick_suspend_broadcast(void) { }
81static inline void tick_resume_broadcast(void) { }
82static inline bool tick_resume_check_broadcast(void) { return false; }
83static inline void tick_broadcast_init(void) { }
84static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; }
85
86/* Set the periodic handler in non broadcast mode */
87static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast)
88{
89 dev->event_handler = tick_handle_periodic;
90}
91# endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */
92
93#else /* !GENERIC_CLOCKEVENTS: */
94static inline void tick_suspend(void) { }
95static inline void tick_resume(void) { }
96#endif /* !GENERIC_CLOCKEVENTS */
97
98/* Oneshot related functions */
99#ifdef CONFIG_TICK_ONESHOT
100extern void tick_setup_oneshot(struct clock_event_device *newdev,
101 void (*handler)(struct clock_event_device *),
102 ktime_t nextevt);
103extern int tick_program_event(ktime_t expires, int force);
104extern void tick_oneshot_notify(void);
105extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
106extern void tick_resume_oneshot(void);
107static inline bool tick_oneshot_possible(void) { return true; }
108extern int tick_oneshot_mode_active(void);
109extern void tick_clock_notify(void);
110extern int tick_check_oneshot_change(int allow_nohz);
111extern int tick_init_highres(void);
112#else /* !CONFIG_TICK_ONESHOT: */
113static inline
114void tick_setup_oneshot(struct clock_event_device *newdev,
115 void (*handler)(struct clock_event_device *),
116 ktime_t nextevt) { BUG(); }
117static inline void tick_resume_oneshot(void) { BUG(); }
118static inline int tick_program_event(ktime_t expires, int force) { return 0; }
119static inline void tick_oneshot_notify(void) { }
120static inline bool tick_oneshot_possible(void) { return false; }
121static inline int tick_oneshot_mode_active(void) { return 0; }
122static inline void tick_clock_notify(void) { }
123static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
124#endif /* !CONFIG_TICK_ONESHOT */
125
126/* Functions related to oneshot broadcasting */
127#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
128extern void tick_broadcast_switch_to_oneshot(void);
129extern int tick_broadcast_oneshot_active(void);
130extern void tick_check_oneshot_broadcast_this_cpu(void);
131bool tick_broadcast_oneshot_available(void);
132extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
133#else /* !(BROADCAST && ONESHOT): */
134static inline void tick_broadcast_switch_to_oneshot(void) { }
135static inline int tick_broadcast_oneshot_active(void) { return 0; }
136static inline void tick_check_oneshot_broadcast_this_cpu(void) { }
137static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); }
138#endif /* !(BROADCAST && ONESHOT) */
139
140#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_HOTPLUG_CPU)
141extern void tick_broadcast_offline(unsigned int cpu);
142#else
143static inline void tick_broadcast_offline(unsigned int cpu) { }
144#endif
145
146/* NO_HZ_FULL internal */
147#ifdef CONFIG_NO_HZ_FULL
148extern void tick_nohz_init(void);
149# else
150static inline void tick_nohz_init(void) { }
151#endif
152
153#ifdef CONFIG_NO_HZ_COMMON
154extern unsigned long tick_nohz_active;
155extern void timers_update_nohz(void);
156# ifdef CONFIG_SMP
157extern struct static_key_false timers_migration_enabled;
158# endif
159#else /* CONFIG_NO_HZ_COMMON */
160static inline void timers_update_nohz(void) { }
161#define tick_nohz_active (0)
162#endif
163
164DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
165
166extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem);
167void timer_clear_idle(void);
1/*
2 * tick internal variable and functions used by low/high res code
3 */
4#include <linux/hrtimer.h>
5#include <linux/tick.h>
6
7#ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD
8
9#define TICK_DO_TIMER_NONE -1
10#define TICK_DO_TIMER_BOOT -2
11
12DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
13extern ktime_t tick_next_period;
14extern ktime_t tick_period;
15extern int tick_do_timer_cpu __read_mostly;
16
17extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
18extern void tick_handle_periodic(struct clock_event_device *dev);
19
20extern void clockevents_shutdown(struct clock_event_device *dev);
21
22/*
23 * NO_HZ / high resolution timer shared code
24 */
25#ifdef CONFIG_TICK_ONESHOT
26extern void tick_setup_oneshot(struct clock_event_device *newdev,
27 void (*handler)(struct clock_event_device *),
28 ktime_t nextevt);
29extern int tick_program_event(ktime_t expires, int force);
30extern void tick_oneshot_notify(void);
31extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
32extern void tick_resume_oneshot(void);
33# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
34extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
35extern void tick_broadcast_oneshot_control(unsigned long reason);
36extern void tick_broadcast_switch_to_oneshot(void);
37extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
38extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
39extern int tick_broadcast_oneshot_active(void);
40extern void tick_check_oneshot_broadcast(int cpu);
41bool tick_broadcast_oneshot_available(void);
42# else /* BROADCAST */
43static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
44{
45 BUG();
46}
47static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
48static inline void tick_broadcast_switch_to_oneshot(void) { }
49static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
50static inline int tick_broadcast_oneshot_active(void) { return 0; }
51static inline void tick_check_oneshot_broadcast(int cpu) { }
52static inline bool tick_broadcast_oneshot_available(void) { return true; }
53# endif /* !BROADCAST */
54
55#else /* !ONESHOT */
56static inline
57void tick_setup_oneshot(struct clock_event_device *newdev,
58 void (*handler)(struct clock_event_device *),
59 ktime_t nextevt)
60{
61 BUG();
62}
63static inline void tick_resume_oneshot(void)
64{
65 BUG();
66}
67static inline int tick_program_event(ktime_t expires, int force)
68{
69 return 0;
70}
71static inline void tick_oneshot_notify(void) { }
72static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
73{
74 BUG();
75}
76static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
77static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
78static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
79{
80 return 0;
81}
82static inline int tick_broadcast_oneshot_active(void) { return 0; }
83static inline bool tick_broadcast_oneshot_available(void) { return false; }
84#endif /* !TICK_ONESHOT */
85
86/*
87 * Broadcasting support
88 */
89#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
90extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
91extern int tick_check_broadcast_device(struct clock_event_device *dev);
92extern int tick_is_broadcast_device(struct clock_event_device *dev);
93extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
94extern void tick_shutdown_broadcast(unsigned int *cpup);
95extern void tick_suspend_broadcast(void);
96extern int tick_resume_broadcast(void);
97
98extern void
99tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
100
101#else /* !BROADCAST */
102
103static inline int tick_check_broadcast_device(struct clock_event_device *dev)
104{
105 return 0;
106}
107
108static inline int tick_is_broadcast_device(struct clock_event_device *dev)
109{
110 return 0;
111}
112static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
113 int cpu)
114{
115 return 0;
116}
117static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
118static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
119static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
120static inline void tick_suspend_broadcast(void) { }
121static inline int tick_resume_broadcast(void) { return 0; }
122
123/*
124 * Set the periodic handler in non broadcast mode
125 */
126static inline void tick_set_periodic_handler(struct clock_event_device *dev,
127 int broadcast)
128{
129 dev->event_handler = tick_handle_periodic;
130}
131#endif /* !BROADCAST */
132
133/*
134 * Check, if the device is functional or a dummy for broadcast
135 */
136static inline int tick_device_is_functional(struct clock_event_device *dev)
137{
138 return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
139}
140
141#endif
142
143extern void do_timer(unsigned long ticks);
144extern seqlock_t xtime_lock;