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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001/* SPDX-License-Identifier: GPL-2.0 */
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -08002/*
3 * tick internal variable and functions used by low/high res code
4 */
Torben Hohne2830b52011-01-27 16:00:32 +01005#include <linux/hrtimer.h>
6#include <linux/tick.h>
Thomas Gleixner64414022008-09-22 18:46:37 +02007
Thomas Gleixner8b094cd2014-07-16 21:04:02 +00008#include "timekeeping.h"
Thomas Gleixnerc1797ba2015-03-25 13:07:37 +01009#include "tick-sched.h"
Thomas Gleixner8b094cd2014-07-16 21:04:02 +000010
Thomas Gleixner9f083b72015-03-25 13:05:19 +010011#ifdef CONFIG_GENERIC_CLOCKEVENTS
Thomas Gleixner64414022008-09-22 18:46:37 +020012
Ingo Molnar3ae7a932015-04-02 11:26:06 +020013# define TICK_DO_TIMER_NONE -1
14# define TICK_DO_TIMER_BOOT -2
Thomas Gleixner64414022008-09-22 18:46:37 +020015
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080016DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080017extern ktime_t tick_next_period;
18extern ktime_t tick_period;
Thomas Gleixnerd3ed7822007-05-08 00:30:03 -070019extern int tick_do_timer_cpu __read_mostly;
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080020
21extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
22extern void tick_handle_periodic(struct clock_event_device *dev);
Thomas Gleixner7172a2862013-04-25 20:31:47 +000023extern void tick_check_new_device(struct clock_event_device *dev);
Thomas Gleixnera49b1162015-04-03 02:38:05 +020024extern void tick_shutdown(unsigned int cpu);
Thomas Gleixner8c53daf2013-04-25 20:31:48 +000025extern void tick_suspend(void);
Thomas Gleixnerf46481d2015-03-25 13:11:04 +010026extern void tick_resume(void);
Thomas Gleixner03e13cf2013-04-25 20:31:50 +000027extern 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);
Thomas Gleixnerc1797ba2015-03-25 13:07:37 +010030extern int tick_is_oneshot_available(void);
Thomas Gleixner7270d112015-03-25 13:11:52 +010031extern struct tick_device *tick_get_device(int cpu);
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080032
Viresh Kumar554ef382015-02-27 17:21:32 +053033extern int clockevents_tick_resume(struct clock_event_device *dev);
Thomas Gleixnerb7475eb2015-03-25 13:06:47 +010034/* 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}
Thomas Gleixner2344abb2008-09-16 11:32:50 -070039
Thomas Gleixnerd7eb2312015-06-02 14:08:46 +020040static inline enum clock_event_state clockevent_get_state(struct clock_event_device *dev)
41{
Thomas Gleixnerbe3ef762015-06-02 14:30:11 +020042 return dev->state_use_accessors;
Thomas Gleixnerd7eb2312015-06-02 14:08:46 +020043}
44
45static inline void clockevent_set_state(struct clock_event_device *dev,
46 enum clock_event_state state)
47{
Thomas Gleixnerbe3ef762015-06-02 14:30:11 +020048 dev->state_use_accessors = state;
Thomas Gleixnerd7eb2312015-06-02 14:08:46 +020049}
50
Thomas Gleixnerb7475eb2015-03-25 13:06:47 +010051extern void clockevents_shutdown(struct clock_event_device *dev);
Thomas Gleixnerc1797ba2015-03-25 13:07:37 +010052extern void clockevents_exchange_device(struct clock_event_device *old,
53 struct clock_event_device *new);
Thomas Gleixnerd7eb2312015-06-02 14:08:46 +020054extern void clockevents_switch_state(struct clock_event_device *dev,
55 enum clock_event_state state);
Thomas Gleixner7270d112015-03-25 13:11:52 +010056extern int clockevents_program_event(struct clock_event_device *dev,
57 ktime_t expires, bool force);
Thomas Gleixnerc1797ba2015-03-25 13:07:37 +010058extern void clockevents_handle_noop(struct clock_event_device *dev);
Thomas Gleixnerb7475eb2015-03-25 13:06:47 +010059extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq);
Patrick Palka891292a2013-10-11 13:11:55 -040060extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080061
Thomas Gleixnerb7475eb2015-03-25 13:06:47 +010062/* Broadcasting support */
Ingo Molnar3ae7a932015-04-02 11:26:06 +020063# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080064extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
Thomas Gleixner7172a2862013-04-25 20:31:47 +000065extern void tick_install_broadcast_device(struct clock_event_device *dev);
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080066extern int tick_is_broadcast_device(struct clock_event_device *dev);
Thomas Gleixnera49b1162015-04-03 02:38:05 +020067extern void tick_shutdown_broadcast(unsigned int cpu);
Thomas Gleixner6321dd62007-03-06 08:25:42 +010068extern void tick_suspend_broadcast(void);
Thomas Gleixnerf46481d2015-03-25 13:11:04 +010069extern void tick_resume_broadcast(void);
70extern bool tick_resume_check_broadcast(void);
Thomas Gleixnerb352bc12013-03-05 14:25:32 +010071extern void tick_broadcast_init(void);
Thomas Gleixnerb7475eb2015-03-25 13:06:47 +010072extern 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);
Thomas Gleixnerc1797ba2015-03-25 13:07:37 +010074extern struct tick_device *tick_get_broadcast_device(void);
75extern struct cpumask *tick_get_broadcast_mask(void);
Ingo Molnar3ae7a932015-04-02 11:26:06 +020076# else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */
Thomas Gleixnerb7475eb2015-03-25 13:06:47 +010077static 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; }
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080080static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
Thomas Gleixnera49b1162015-04-03 02:38:05 +020081static inline void tick_shutdown_broadcast(unsigned int cpu) { }
Thomas Gleixner6321dd62007-03-06 08:25:42 +010082static inline void tick_suspend_broadcast(void) { }
Thomas Gleixnerf46481d2015-03-25 13:11:04 +010083static inline void tick_resume_broadcast(void) { }
84static inline bool tick_resume_check_broadcast(void) { return false; }
Thomas Gleixnerb352bc12013-03-05 14:25:32 +010085static inline void tick_broadcast_init(void) { }
Thomas Gleixnerb7475eb2015-03-25 13:06:47 +010086static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; }
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080087
Thomas Gleixnerb7475eb2015-03-25 13:06:47 +010088/* Set the periodic handler in non broadcast mode */
89static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast)
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080090{
91 dev->event_handler = tick_handle_periodic;
92}
Ingo Molnar3ae7a932015-04-02 11:26:06 +020093# 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 */
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -0800127
Thomas Gleixnerb7475eb2015-03-25 13:06:47 +0100128/* Functions related to oneshot broadcasting */
129#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
Thomas Gleixnerb7475eb2015-03-25 13:06:47 +0100130extern void tick_broadcast_switch_to_oneshot(void);
Thomas Gleixnera49b1162015-04-03 02:38:05 +0200131extern void tick_shutdown_broadcast_oneshot(unsigned int cpu);
Thomas Gleixnerb7475eb2015-03-25 13:06:47 +0100132extern int tick_broadcast_oneshot_active(void);
133extern void tick_check_oneshot_broadcast_this_cpu(void);
134bool tick_broadcast_oneshot_available(void);
Thomas Gleixnerc1797ba2015-03-25 13:07:37 +0100135extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
Ingo Molnar3ae7a932015-04-02 11:26:06 +0200136#else /* !(BROADCAST && ONESHOT): */
Thomas Gleixnerb7475eb2015-03-25 13:06:47 +0100137static inline void tick_broadcast_switch_to_oneshot(void) { }
Thomas Gleixnera49b1162015-04-03 02:38:05 +0200138static inline void tick_shutdown_broadcast_oneshot(unsigned int cpu) { }
Thomas Gleixnerb7475eb2015-03-25 13:06:47 +0100139static 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(); }
Ingo Molnar3ae7a932015-04-02 11:26:06 +0200142#endif /* !(BROADCAST && ONESHOT) */
Torben Hohne2830b52011-01-27 16:00:32 +0100143
Thomas Gleixnerb7475eb2015-03-25 13:06:47 +0100144/* 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
Thomas Gleixnerc1ad3482015-04-14 21:08:58 +0000150
Thomas Gleixnerbc7a34b2015-05-26 22:50:33 +0000151#ifdef CONFIG_NO_HZ_COMMON
152extern unsigned long tick_nohz_active;
Thomas Gleixnerae67bad2018-01-14 23:30:51 +0100153extern void timers_update_nohz(void);
Thomas Gleixnerae67bad2018-01-14 23:30:51 +0100154# 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) { }
Thomas Gleixnerbc7a34b2015-05-26 22:50:33 +0000159#define tick_nohz_active (0)
Thomas Gleixnerbc7a34b2015-05-26 22:50:33 +0000160#endif
161
162DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
163
Thomas Gleixnerc1ad3482015-04-14 21:08:58 +0000164extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem);
Thomas Gleixnera683f392016-07-04 09:50:36 +0000165void timer_clear_idle(void);