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tick: Move broadcast cancellation up to CPUHP_AP_TICK_DYING
[linux-2.6-block.git] / kernel / time / tick-internal.h
CommitLineData
b2441318 1/* SPDX-License-Identifier: GPL-2.0 */
f8381cba
TG		 2/*
3 * tick internal variable and functions used by low/high res code
4 */
e2830b5c
TH		 5#include <linux/hrtimer.h>
6#include <linux/tick.h>
6441402b 7
8b094cd0 8#include "timekeeping.h"
c1797baf 9#include "tick-sched.h"
8b094cd0 10
f73d9257
AMB		 11struct timer_events {
12 u64 local;
13 u64 global;
14};
15
9f083b74 16#ifdef CONFIG_GENERIC_CLOCKEVENTS
6441402b 17
3ae7a939
IM		 18# define TICK_DO_TIMER_NONE -1
19# define TICK_DO_TIMER_BOOT -2
6441402b 20
f8381cba 21DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
f8381cba 22extern ktime_t tick_next_period;
d3ed7824 23extern int tick_do_timer_cpu __read_mostly;
f8381cba
TG		 24
25extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
26extern void tick_handle_periodic(struct clock_event_device *dev);
7172a286 27extern void tick_check_new_device(struct clock_event_device *dev);
a49b116d 28extern void tick_shutdown(unsigned int cpu);
8c53daf6 29extern void tick_suspend(void);
f46481d0 30extern void tick_resume(void);
03e13cf5
TG		 31extern bool tick_check_replacement(struct clock_event_device *curdev,
32 struct clock_event_device *newdev);
33extern void tick_install_replacement(struct clock_event_device *dev);
c1797baf 34extern int tick_is_oneshot_available(void);
7270d11c 35extern struct tick_device *tick_get_device(int cpu);
f8381cba 36
554ef387 37extern int clockevents_tick_resume(struct clock_event_device *dev);
b7475eb5
TG		 38/* Check, if the device is functional or a dummy for broadcast */
39static inline int tick_device_is_functional(struct clock_event_device *dev)
40{
41 return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
42}
2344abbc 43
d7eb231c
TG		 44static inline enum clock_event_state clockevent_get_state(struct clock_event_device *dev)
45{
be3ef76e 46 return dev->state_use_accessors;
d7eb231c
TG		 47}
48
49static inline void clockevent_set_state(struct clock_event_device *dev,
50 enum clock_event_state state)
51{
be3ef76e 52 dev->state_use_accessors = state;
d7eb231c
TG		 53}
54
b7475eb5 55extern void clockevents_shutdown(struct clock_event_device *dev);
c1797baf
TG		 56extern void clockevents_exchange_device(struct clock_event_device *old,
57 struct clock_event_device *new);
d7eb231c
TG		 58extern void clockevents_switch_state(struct clock_event_device *dev,
59 enum clock_event_state state);
7270d11c
TG		 60extern int clockevents_program_event(struct clock_event_device *dev,
61 ktime_t expires, bool force);
c1797baf 62extern void clockevents_handle_noop(struct clock_event_device *dev);
b7475eb5 63extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq);
79bf2bb3 64
b7475eb5 65/* Broadcasting support */
3ae7a939 66# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
f8381cba 67extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
c94a8537 68extern void tick_install_broadcast_device(struct clock_event_device *dev, int cpu);
f8381cba 69extern int tick_is_broadcast_device(struct clock_event_device *dev);
6321dd60 70extern void tick_suspend_broadcast(void);
f46481d0
TG		 71extern void tick_resume_broadcast(void);
72extern bool tick_resume_check_broadcast(void);
b352bc1c 73extern void tick_broadcast_init(void);
b7475eb5
TG		 74extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
75extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
c1797baf
TG		 76extern struct tick_device *tick_get_broadcast_device(void);
77extern struct cpumask *tick_get_broadcast_mask(void);
245a057f 78extern const struct clock_event_device *tick_get_wakeup_device(int cpu);
3ae7a939 79# else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */
c94a8537 80static inline void tick_install_broadcast_device(struct clock_event_device *dev, int cpu) { }
b7475eb5
TG		 81static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; }
82static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; }
f8381cba 83static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
6321dd60 84static inline void tick_suspend_broadcast(void) { }
f46481d0
TG		 85static inline void tick_resume_broadcast(void) { }
86static inline bool tick_resume_check_broadcast(void) { return false; }
b352bc1c 87static inline void tick_broadcast_init(void) { }
b7475eb5 88static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; }
f8381cba 89
b7475eb5
TG		 90/* Set the periodic handler in non broadcast mode */
91static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast)
f8381cba
TG		 92{
93 dev->event_handler = tick_handle_periodic;
94}
3ae7a939
IM		 95# endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */
96
97#else /* !GENERIC_CLOCKEVENTS: */
98static inline void tick_suspend(void) { }
99static inline void tick_resume(void) { }
100#endif /* !GENERIC_CLOCKEVENTS */
101
102/* Oneshot related functions */
103#ifdef CONFIG_TICK_ONESHOT
104extern void tick_setup_oneshot(struct clock_event_device *newdev,
105 void (*handler)(struct clock_event_device *),
106 ktime_t nextevt);
107extern int tick_program_event(ktime_t expires, int force);
108extern void tick_oneshot_notify(void);
109extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
110extern void tick_resume_oneshot(void);
111static inline bool tick_oneshot_possible(void) { return true; }
112extern int tick_oneshot_mode_active(void);
113extern void tick_clock_notify(void);
114extern int tick_check_oneshot_change(int allow_nohz);
115extern int tick_init_highres(void);
116#else /* !CONFIG_TICK_ONESHOT: */
117static inline
118void tick_setup_oneshot(struct clock_event_device *newdev,
119 void (*handler)(struct clock_event_device *),
120 ktime_t nextevt) { BUG(); }
121static inline void tick_resume_oneshot(void) { BUG(); }
122static inline int tick_program_event(ktime_t expires, int force) { return 0; }
123static inline void tick_oneshot_notify(void) { }
124static inline bool tick_oneshot_possible(void) { return false; }
125static inline int tick_oneshot_mode_active(void) { return 0; }
126static inline void tick_clock_notify(void) { }
127static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
128#endif /* !CONFIG_TICK_ONESHOT */
f8381cba 129
b7475eb5
TG		 130/* Functions related to oneshot broadcasting */
131#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
b7475eb5 132extern void tick_broadcast_switch_to_oneshot(void);
b7475eb5
TG		 133extern int tick_broadcast_oneshot_active(void);
134extern void tick_check_oneshot_broadcast_this_cpu(void);
135bool tick_broadcast_oneshot_available(void);
c1797baf 136extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
3ae7a939 137#else /* !(BROADCAST && ONESHOT): */
b7475eb5 138static inline void tick_broadcast_switch_to_oneshot(void) { }
b7475eb5
TG		 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(); }
3ae7a939 142#endif /* !(BROADCAST && ONESHOT) */
7cf37e87 143
1b72d432 144#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_HOTPLUG_CPU)
ef8969bb 145extern void tick_offline_cpu(unsigned int cpu);
1b72d432
TG		 146extern void tick_broadcast_offline(unsigned int cpu);
147#else
ef8969bb 148static inline void tick_offline_cpu(unsigned int cpu) { }
1b72d432
TG		 149static inline void tick_broadcast_offline(unsigned int cpu) { }
150#endif
151
b7475eb5
TG		 152/* NO_HZ_FULL internal */
153#ifdef CONFIG_NO_HZ_FULL
154extern void tick_nohz_init(void);
155# else
156static inline void tick_nohz_init(void) { }
157#endif
c1ad348b 158
bc7a34b8
TG		 159#ifdef CONFIG_NO_HZ_COMMON
160extern unsigned long tick_nohz_active;
ae67bada 161extern void timers_update_nohz(void);
4c532939 162extern u64 get_jiffies_update(unsigned long *basej);
ae67bada
TG		 163# ifdef CONFIG_SMP
164extern struct static_key_false timers_migration_enabled;
f73d9257
AMB		 165extern void fetch_next_timer_interrupt_remote(unsigned long basej, u64 basem,
166 struct timer_events *tevt,
167 unsigned int cpu);
168extern void timer_lock_remote_bases(unsigned int cpu);
169extern void timer_unlock_remote_bases(unsigned int cpu);
57e95a5c 170extern bool timer_base_is_idle(void);
7ee98877 171extern void timer_expire_remote(unsigned int cpu);
ae67bada
TG		 172# endif
173#else /* CONFIG_NO_HZ_COMMON */
174static inline void timers_update_nohz(void) { }
bc7a34b8 175#define tick_nohz_active (0)
bc7a34b8
TG		 176#endif
177
178DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
179
c1ad348b 180extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem);
e2e1d724 181u64 timer_base_try_to_set_idle(unsigned long basej, u64 basem, bool *idle);
a683f390 182void timer_clear_idle(void);
8c3b5e6e 183
17a1b882
TG		 184#define CLOCK_SET_WALL \
185 (BIT(HRTIMER_BASE_REALTIME) | BIT(HRTIMER_BASE_REALTIME_SOFT) | \
186 BIT(HRTIMER_BASE_TAI) | BIT(HRTIMER_BASE_TAI_SOFT))
187
188#define CLOCK_SET_BOOT \
189 (BIT(HRTIMER_BASE_BOOTTIME) | BIT(HRTIMER_BASE_BOOTTIME_SOFT))
190
191void clock_was_set(unsigned int bases);
8c3b5e6e 192void clock_was_set_delayed(void);
a761a67f
TG		 193
194void hrtimers_resume_local(void);
d25a0252
PM		 195
196/* Since jiffies uses a simple TICK_NSEC multiplier
197 * conversion, the .shift value could be zero. However
198 * this would make NTP adjustments impossible as they are
199 * in units of 1/2^.shift. Thus we use JIFFIES_SHIFT to
200 * shift both the nominator and denominator the same
201 * amount, and give ntp adjustments in units of 1/2^8
202 *
203 * The value 8 is somewhat carefully chosen, as anything
204 * larger can result in overflows. TICK_NSEC grows as HZ
205 * shrinks, so values greater than 8 overflow 32bits when
206 * HZ=100.
207 */
208#if HZ < 34
209#define JIFFIES_SHIFT 6
210#elif HZ < 67
211#define JIFFIES_SHIFT 7
212#else
213#define JIFFIES_SHIFT 8
214#endif
a89299c4
AB		 215
216extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
Linux 6.x block layer and io_uring tree(s)