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#include "timekeeping.h" 8#include "tick-sched.h" 9 10#ifdef CONFIG_GENERIC_CLOCKEVENTS 11 12# define TICK_DO_TIMER_NONE -1 13# define TICK_DO_TIMER_BOOT -2 14 15DECLARE_PER_CPU(struct tick_device, tick_cpu_device); 16extern ktime_t tick_next_period; 17extern ktime_t tick_period; 18extern int tick_do_timer_cpu __read_mostly; 19 20extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast); 21extern void tick_handle_periodic(struct clock_event_device *dev); 22extern void tick_check_new_device(struct clock_event_device *dev); 23extern void tick_shutdown(unsigned int cpu); 24extern void tick_suspend(void); 25extern void tick_resume(void); 26extern bool tick_check_replacement(struct clock_event_device *curdev, 27 struct clock_event_device *newdev); 28extern void tick_install_replacement(struct clock_event_device *dev); 29extern int tick_is_oneshot_available(void); 30extern struct tick_device *tick_get_device(int cpu); 31 32extern int clockevents_tick_resume(struct clock_event_device *dev); 33/* Check, if the device is functional or a dummy for broadcast */ 34static inline int tick_device_is_functional(struct clock_event_device *dev) 35{ 36 return !(dev->features & CLOCK_EVT_FEAT_DUMMY); 37} 38 39extern void clockevents_shutdown(struct clock_event_device *dev); 40extern void clockevents_exchange_device(struct clock_event_device *old, 41 struct clock_event_device *new); 42extern void clockevents_set_state(struct clock_event_device *dev, 43 enum clock_event_state state); 44extern int clockevents_program_event(struct clock_event_device *dev, 45 ktime_t expires, bool force); 46extern void clockevents_handle_noop(struct clock_event_device *dev); 47extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq); 48extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt); 49 50/* Broadcasting support */ 51# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 52extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); 53extern void tick_install_broadcast_device(struct clock_event_device *dev); 54extern int tick_is_broadcast_device(struct clock_event_device *dev); 55extern void tick_shutdown_broadcast(unsigned int cpu); 56extern void tick_suspend_broadcast(void); 57extern void tick_resume_broadcast(void); 58extern bool tick_resume_check_broadcast(void); 59extern void tick_broadcast_init(void); 60extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); 61extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq); 62extern struct tick_device *tick_get_broadcast_device(void); 63extern struct cpumask *tick_get_broadcast_mask(void); 64# else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */ 65static inline void tick_install_broadcast_device(struct clock_event_device *dev) { } 66static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; } 67static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; } 68static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } 69static inline void tick_shutdown_broadcast(unsigned int cpu) { } 70static inline void tick_suspend_broadcast(void) { } 71static inline void tick_resume_broadcast(void) { } 72static inline bool tick_resume_check_broadcast(void) { return false; } 73static inline void tick_broadcast_init(void) { } 74static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; } 75 76/* Set the periodic handler in non broadcast mode */ 77static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast) 78{ 79 dev->event_handler = tick_handle_periodic; 80} 81# endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */ 82 83#else /* !GENERIC_CLOCKEVENTS: */ 84static inline void tick_suspend(void) { } 85static inline void tick_resume(void) { } 86#endif /* !GENERIC_CLOCKEVENTS */ 87 88/* Oneshot related functions */ 89#ifdef CONFIG_TICK_ONESHOT 90extern void tick_setup_oneshot(struct clock_event_device *newdev, 91 void (*handler)(struct clock_event_device *), 92 ktime_t nextevt); 93extern int tick_program_event(ktime_t expires, int force); 94extern void tick_oneshot_notify(void); 95extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *)); 96extern void tick_resume_oneshot(void); 97static inline bool tick_oneshot_possible(void) { return true; } 98extern int tick_oneshot_mode_active(void); 99extern void tick_clock_notify(void); 100extern int tick_check_oneshot_change(int allow_nohz); 101extern int tick_init_highres(void); 102#else /* !CONFIG_TICK_ONESHOT: */ 103static inline 104void tick_setup_oneshot(struct clock_event_device *newdev, 105 void (*handler)(struct clock_event_device *), 106 ktime_t nextevt) { BUG(); } 107static inline void tick_resume_oneshot(void) { BUG(); } 108static inline int tick_program_event(ktime_t expires, int force) { return 0; } 109static inline void tick_oneshot_notify(void) { } 110static inline bool tick_oneshot_possible(void) { return false; } 111static inline int tick_oneshot_mode_active(void) { return 0; } 112static inline void tick_clock_notify(void) { } 113static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } 114#endif /* !CONFIG_TICK_ONESHOT */ 115 116/* Functions related to oneshot broadcasting */ 117#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) 118extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc); 119extern void tick_broadcast_switch_to_oneshot(void); 120extern void tick_shutdown_broadcast_oneshot(unsigned int cpu); 121extern int tick_broadcast_oneshot_active(void); 122extern void tick_check_oneshot_broadcast_this_cpu(void); 123bool tick_broadcast_oneshot_available(void); 124extern struct cpumask *tick_get_broadcast_oneshot_mask(void); 125#else /* !(BROADCAST && ONESHOT): */ 126static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) { BUG(); } 127static inline void tick_broadcast_switch_to_oneshot(void) { } 128static inline void tick_shutdown_broadcast_oneshot(unsigned int cpu) { } 129static inline int tick_broadcast_oneshot_active(void) { return 0; } 130static inline void tick_check_oneshot_broadcast_this_cpu(void) { } 131static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); } 132#endif /* !(BROADCAST && ONESHOT) */ 133 134/* NO_HZ_FULL internal */ 135#ifdef CONFIG_NO_HZ_FULL 136extern void tick_nohz_init(void); 137# else 138static inline void tick_nohz_init(void) { } 139#endif 140