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review.trustedfirmware.org / hafnium / third_party / linux / b4b6d4a02fa8aa8187d426b508fb7f3b69df0dcc / . / kernel / time / tick-internal.h
blob: e277284c2831c9c1dae2219c1a135e1f5dc8945d [file] [log] [blame]
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame^]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_shutdown_broadcast(unsigned int cpu);
68extern void tick_suspend_broadcast(void);
69extern void tick_resume_broadcast(void);
70extern bool tick_resume_check_broadcast(void);
71extern void tick_broadcast_init(void);
72extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
73extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
74extern struct tick_device *tick_get_broadcast_device(void);
75extern struct cpumask *tick_get_broadcast_mask(void);
76# else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */
77static inline void tick_install_broadcast_device(struct clock_event_device *dev) { }
78static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; }
79static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; }
80static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
81static inline void tick_shutdown_broadcast(unsigned int cpu) { }
82static inline void tick_suspend_broadcast(void) { }
83static inline void tick_resume_broadcast(void) { }
84static inline bool tick_resume_check_broadcast(void) { return false; }
85static inline void tick_broadcast_init(void) { }
86static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; }
87
88/* Set the periodic handler in non broadcast mode */
89static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast)
90{
91 dev->event_handler = tick_handle_periodic;
92}
93# endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */
94
95#else /* !GENERIC_CLOCKEVENTS: */
96static inline void tick_suspend(void) { }
97static inline void tick_resume(void) { }
98#endif /* !GENERIC_CLOCKEVENTS */
99
100/* Oneshot related functions */
101#ifdef CONFIG_TICK_ONESHOT
102extern void tick_setup_oneshot(struct clock_event_device *newdev,
103 void (*handler)(struct clock_event_device *),
104 ktime_t nextevt);
105extern int tick_program_event(ktime_t expires, int force);
106extern void tick_oneshot_notify(void);
107extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
108extern void tick_resume_oneshot(void);
109static inline bool tick_oneshot_possible(void) { return true; }
110extern int tick_oneshot_mode_active(void);
111extern void tick_clock_notify(void);
112extern int tick_check_oneshot_change(int allow_nohz);
113extern int tick_init_highres(void);
114#else /* !CONFIG_TICK_ONESHOT: */
115static inline
116void tick_setup_oneshot(struct clock_event_device *newdev,
117 void (*handler)(struct clock_event_device *),
118 ktime_t nextevt) { BUG(); }
119static inline void tick_resume_oneshot(void) { BUG(); }
120static inline int tick_program_event(ktime_t expires, int force) { return 0; }
121static inline void tick_oneshot_notify(void) { }
122static inline bool tick_oneshot_possible(void) { return false; }
123static inline int tick_oneshot_mode_active(void) { return 0; }
124static inline void tick_clock_notify(void) { }
125static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
126#endif /* !CONFIG_TICK_ONESHOT */
127
128/* Functions related to oneshot broadcasting */
129#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
130extern void tick_broadcast_switch_to_oneshot(void);
131extern void tick_shutdown_broadcast_oneshot(unsigned int cpu);
132extern int tick_broadcast_oneshot_active(void);
133extern void tick_check_oneshot_broadcast_this_cpu(void);
134bool tick_broadcast_oneshot_available(void);
135extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
136#else /* !(BROADCAST && ONESHOT): */
137static inline void tick_broadcast_switch_to_oneshot(void) { }
138static inline void tick_shutdown_broadcast_oneshot(unsigned int cpu) { }
139static inline int tick_broadcast_oneshot_active(void) { return 0; }
140static inline void tick_check_oneshot_broadcast_this_cpu(void) { }
141static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); }
142#endif /* !(BROADCAST && ONESHOT) */
143
144/* NO_HZ_FULL internal */
145#ifdef CONFIG_NO_HZ_FULL
146extern void tick_nohz_init(void);
147# else
148static inline void tick_nohz_init(void) { }
149#endif
150
151#ifdef CONFIG_NO_HZ_COMMON
152extern unsigned long tick_nohz_active;
153extern void timers_update_nohz(void);
154# ifdef CONFIG_SMP
155extern struct static_key_false timers_migration_enabled;
156# endif
157#else /* CONFIG_NO_HZ_COMMON */
158static inline void timers_update_nohz(void) { }
159#define tick_nohz_active (0)
160#endif
161
162DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
163
164extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem);
165void timer_clear_idle(void);