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166 lines
6.8 KiB
166 lines
6.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* tick internal variable and functions used by low/high res code |
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*/ |
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#include <linux/hrtimer.h> |
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#include <linux/tick.h> |
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#include "timekeeping.h" |
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#include "tick-sched.h" |
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#ifdef CONFIG_GENERIC_CLOCKEVENTS |
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# define TICK_DO_TIMER_NONE -1 |
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# define TICK_DO_TIMER_BOOT -2 |
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DECLARE_PER_CPU(struct tick_device, tick_cpu_device); |
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extern ktime_t tick_next_period; |
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extern int tick_do_timer_cpu __read_mostly; |
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extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast); |
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extern void tick_handle_periodic(struct clock_event_device *dev); |
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extern void tick_check_new_device(struct clock_event_device *dev); |
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extern void tick_shutdown(unsigned int cpu); |
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extern void tick_suspend(void); |
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extern void tick_resume(void); |
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extern bool tick_check_replacement(struct clock_event_device *curdev, |
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struct clock_event_device *newdev); |
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extern void tick_install_replacement(struct clock_event_device *dev); |
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extern int tick_is_oneshot_available(void); |
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extern struct tick_device *tick_get_device(int cpu); |
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extern int clockevents_tick_resume(struct clock_event_device *dev); |
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/* Check, if the device is functional or a dummy for broadcast */ |
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static inline int tick_device_is_functional(struct clock_event_device *dev) |
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{ |
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return !(dev->features & CLOCK_EVT_FEAT_DUMMY); |
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} |
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static inline enum clock_event_state clockevent_get_state(struct clock_event_device *dev) |
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{ |
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return dev->state_use_accessors; |
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} |
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static inline void clockevent_set_state(struct clock_event_device *dev, |
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enum clock_event_state state) |
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{ |
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dev->state_use_accessors = state; |
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} |
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extern void clockevents_shutdown(struct clock_event_device *dev); |
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extern void clockevents_exchange_device(struct clock_event_device *old, |
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struct clock_event_device *new); |
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extern void clockevents_switch_state(struct clock_event_device *dev, |
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enum clock_event_state state); |
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extern int clockevents_program_event(struct clock_event_device *dev, |
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ktime_t expires, bool force); |
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extern void clockevents_handle_noop(struct clock_event_device *dev); |
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extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq); |
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extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt); |
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/* Broadcasting support */ |
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# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
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extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); |
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extern void tick_install_broadcast_device(struct clock_event_device *dev); |
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extern int tick_is_broadcast_device(struct clock_event_device *dev); |
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extern void tick_suspend_broadcast(void); |
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extern void tick_resume_broadcast(void); |
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extern bool tick_resume_check_broadcast(void); |
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extern void tick_broadcast_init(void); |
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extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); |
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extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq); |
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extern struct tick_device *tick_get_broadcast_device(void); |
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extern struct cpumask *tick_get_broadcast_mask(void); |
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# else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */ |
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static inline void tick_install_broadcast_device(struct clock_event_device *dev) { } |
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static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; } |
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static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; } |
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static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } |
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static inline void tick_suspend_broadcast(void) { } |
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static inline void tick_resume_broadcast(void) { } |
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static inline bool tick_resume_check_broadcast(void) { return false; } |
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static inline void tick_broadcast_init(void) { } |
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static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; } |
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/* Set the periodic handler in non broadcast mode */ |
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static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast) |
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{ |
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dev->event_handler = tick_handle_periodic; |
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} |
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# endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */ |
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#else /* !GENERIC_CLOCKEVENTS: */ |
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static inline void tick_suspend(void) { } |
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static inline void tick_resume(void) { } |
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#endif /* !GENERIC_CLOCKEVENTS */ |
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/* Oneshot related functions */ |
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#ifdef CONFIG_TICK_ONESHOT |
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extern void tick_setup_oneshot(struct clock_event_device *newdev, |
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void (*handler)(struct clock_event_device *), |
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ktime_t nextevt); |
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extern int tick_program_event(ktime_t expires, int force); |
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extern void tick_oneshot_notify(void); |
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extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *)); |
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extern void tick_resume_oneshot(void); |
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static inline bool tick_oneshot_possible(void) { return true; } |
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extern int tick_oneshot_mode_active(void); |
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extern void tick_clock_notify(void); |
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extern int tick_check_oneshot_change(int allow_nohz); |
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extern int tick_init_highres(void); |
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#else /* !CONFIG_TICK_ONESHOT: */ |
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static inline |
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void tick_setup_oneshot(struct clock_event_device *newdev, |
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void (*handler)(struct clock_event_device *), |
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ktime_t nextevt) { BUG(); } |
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static inline void tick_resume_oneshot(void) { BUG(); } |
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static inline int tick_program_event(ktime_t expires, int force) { return 0; } |
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static inline void tick_oneshot_notify(void) { } |
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static inline bool tick_oneshot_possible(void) { return false; } |
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static inline int tick_oneshot_mode_active(void) { return 0; } |
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static inline void tick_clock_notify(void) { } |
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static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } |
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#endif /* !CONFIG_TICK_ONESHOT */ |
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/* Functions related to oneshot broadcasting */ |
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#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) |
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extern void tick_broadcast_switch_to_oneshot(void); |
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extern int tick_broadcast_oneshot_active(void); |
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extern void tick_check_oneshot_broadcast_this_cpu(void); |
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bool tick_broadcast_oneshot_available(void); |
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extern struct cpumask *tick_get_broadcast_oneshot_mask(void); |
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#else /* !(BROADCAST && ONESHOT): */ |
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static inline void tick_broadcast_switch_to_oneshot(void) { } |
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static inline int tick_broadcast_oneshot_active(void) { return 0; } |
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static inline void tick_check_oneshot_broadcast_this_cpu(void) { } |
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static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); } |
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#endif /* !(BROADCAST && ONESHOT) */ |
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#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_HOTPLUG_CPU) |
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extern void tick_broadcast_offline(unsigned int cpu); |
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#else |
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static inline void tick_broadcast_offline(unsigned int cpu) { } |
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#endif |
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/* NO_HZ_FULL internal */ |
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#ifdef CONFIG_NO_HZ_FULL |
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extern void tick_nohz_init(void); |
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# else |
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static inline void tick_nohz_init(void) { } |
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#endif |
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#ifdef CONFIG_NO_HZ_COMMON |
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extern unsigned long tick_nohz_active; |
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extern void timers_update_nohz(void); |
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# ifdef CONFIG_SMP |
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extern struct static_key_false timers_migration_enabled; |
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# endif |
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#else /* CONFIG_NO_HZ_COMMON */ |
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static inline void timers_update_nohz(void) { } |
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#define tick_nohz_active (0) |
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#endif |
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DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases); |
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extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem); |
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void timer_clear_idle(void);
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