1f8381cbaSThomas Gleixner /* 2f8381cbaSThomas Gleixner * tick internal variable and functions used by low/high res code 3f8381cbaSThomas Gleixner */ 4e2830b5cSTorben Hohn #include <linux/hrtimer.h> 5e2830b5cSTorben Hohn #include <linux/tick.h> 66441402bSThomas Gleixner 78b094cd0SThomas Gleixner #include "timekeeping.h" 8c1797bafSThomas Gleixner #include "tick-sched.h" 98b094cd0SThomas Gleixner 109f083b74SThomas Gleixner #ifdef CONFIG_GENERIC_CLOCKEVENTS 116441402bSThomas Gleixner 126441402bSThomas Gleixner #define TICK_DO_TIMER_NONE -1 136441402bSThomas Gleixner #define TICK_DO_TIMER_BOOT -2 146441402bSThomas Gleixner 15f8381cbaSThomas Gleixner DECLARE_PER_CPU(struct tick_device, tick_cpu_device); 16f8381cbaSThomas Gleixner extern ktime_t tick_next_period; 17f8381cbaSThomas Gleixner extern ktime_t tick_period; 18d3ed7824SThomas Gleixner extern int tick_do_timer_cpu __read_mostly; 19f8381cbaSThomas Gleixner 20f8381cbaSThomas Gleixner extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast); 21f8381cbaSThomas Gleixner extern void tick_handle_periodic(struct clock_event_device *dev); 227172a286SThomas Gleixner extern void tick_check_new_device(struct clock_event_device *dev); 238c53daf6SThomas Gleixner extern void tick_handover_do_timer(int *cpup); 248c53daf6SThomas Gleixner extern void tick_shutdown(unsigned int *cpup); 258c53daf6SThomas Gleixner extern void tick_suspend(void); 268c53daf6SThomas Gleixner extern void tick_resume(void); 2703e13cf5SThomas Gleixner extern bool tick_check_replacement(struct clock_event_device *curdev, 2803e13cf5SThomas Gleixner struct clock_event_device *newdev); 2903e13cf5SThomas Gleixner extern void tick_install_replacement(struct clock_event_device *dev); 30c1797bafSThomas Gleixner extern int tick_is_oneshot_available(void); 31f8381cbaSThomas Gleixner 32554ef387SViresh Kumar extern int clockevents_tick_resume(struct clock_event_device *dev); 33b7475eb5SThomas Gleixner /* Check, if the device is functional or a dummy for broadcast */ 34b7475eb5SThomas Gleixner static inline int tick_device_is_functional(struct clock_event_device *dev) 35b7475eb5SThomas Gleixner { 36b7475eb5SThomas Gleixner return !(dev->features & CLOCK_EVT_FEAT_DUMMY); 37b7475eb5SThomas Gleixner } 382344abbcSThomas Gleixner 39b7475eb5SThomas Gleixner extern void clockevents_shutdown(struct clock_event_device *dev); 40c1797bafSThomas Gleixner extern void clockevents_exchange_device(struct clock_event_device *old, 41c1797bafSThomas Gleixner struct clock_event_device *new); 42c1797bafSThomas Gleixner extern void clockevents_handle_noop(struct clock_event_device *dev); 43b7475eb5SThomas Gleixner extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq); 44891292a7SPatrick Palka extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt); 45b7475eb5SThomas Gleixner #endif /* GENERIC_CLOCKEVENTS */ 4603e13cf5SThomas Gleixner 47b7475eb5SThomas Gleixner /* Oneshot related functions */ 4879bf2bb3SThomas Gleixner #ifdef CONFIG_TICK_ONESHOT 4979bf2bb3SThomas Gleixner extern void tick_setup_oneshot(struct clock_event_device *newdev, 5079bf2bb3SThomas Gleixner void (*handler)(struct clock_event_device *), 5179bf2bb3SThomas Gleixner ktime_t nextevt); 5279bf2bb3SThomas Gleixner extern int tick_program_event(ktime_t expires, int force); 5379bf2bb3SThomas Gleixner extern void tick_oneshot_notify(void); 5479bf2bb3SThomas Gleixner extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *)); 55cd05a1f8SThomas Gleixner extern void tick_resume_oneshot(void); 56b7475eb5SThomas Gleixner static inline bool tick_oneshot_possible(void) { return true; } 57c1797bafSThomas Gleixner extern int tick_oneshot_mode_active(void); 58c1797bafSThomas Gleixner extern void tick_clock_notify(void); 59c1797bafSThomas Gleixner extern int tick_check_oneshot_change(int allow_nohz); 60c1797bafSThomas Gleixner extern int tick_init_highres(void); 6179bf2bb3SThomas Gleixner #else /* !ONESHOT */ 6279bf2bb3SThomas Gleixner static inline 6379bf2bb3SThomas Gleixner void tick_setup_oneshot(struct clock_event_device *newdev, 6479bf2bb3SThomas Gleixner void (*handler)(struct clock_event_device *), 65b7475eb5SThomas Gleixner ktime_t nextevt) { BUG(); } 66b7475eb5SThomas Gleixner static inline void tick_resume_oneshot(void) { BUG(); } 67b7475eb5SThomas Gleixner static inline int tick_program_event(ktime_t expires, int force) { return 0; } 6879bf2bb3SThomas Gleixner static inline void tick_oneshot_notify(void) { } 69b7475eb5SThomas Gleixner static inline bool tick_oneshot_possible(void) { return false; } 70c1797bafSThomas Gleixner static inline int tick_oneshot_mode_active(void) { return 0; } 71c1797bafSThomas Gleixner static inline void tick_clock_notify(void) { } 72c1797bafSThomas Gleixner static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } 7379bf2bb3SThomas Gleixner #endif /* !TICK_ONESHOT */ 7479bf2bb3SThomas Gleixner 75b7475eb5SThomas Gleixner /* Broadcasting support */ 76f8381cbaSThomas Gleixner #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 77f8381cbaSThomas Gleixner extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); 787172a286SThomas Gleixner extern void tick_install_broadcast_device(struct clock_event_device *dev); 79f8381cbaSThomas Gleixner extern int tick_is_broadcast_device(struct clock_event_device *dev); 80f8381cbaSThomas Gleixner extern void tick_broadcast_on_off(unsigned long reason, int *oncpu); 81f8381cbaSThomas Gleixner extern void tick_shutdown_broadcast(unsigned int *cpup); 826321dd60SThomas Gleixner extern void tick_suspend_broadcast(void); 836321dd60SThomas Gleixner extern int tick_resume_broadcast(void); 84b352bc1cSThomas Gleixner extern void tick_broadcast_init(void); 85b7475eb5SThomas Gleixner extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); 86b7475eb5SThomas Gleixner extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq); 87c1797bafSThomas Gleixner extern struct tick_device *tick_get_broadcast_device(void); 88c1797bafSThomas Gleixner extern struct cpumask *tick_get_broadcast_mask(void); 89f8381cbaSThomas Gleixner #else /* !BROADCAST */ 90b7475eb5SThomas Gleixner static inline void tick_install_broadcast_device(struct clock_event_device *dev) { } 91b7475eb5SThomas Gleixner static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; } 92b7475eb5SThomas Gleixner static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; } 93f8381cbaSThomas Gleixner static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } 94f8381cbaSThomas Gleixner static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { } 95f8381cbaSThomas Gleixner static inline void tick_shutdown_broadcast(unsigned int *cpup) { } 966321dd60SThomas Gleixner static inline void tick_suspend_broadcast(void) { } 976321dd60SThomas Gleixner static inline int tick_resume_broadcast(void) { return 0; } 98b352bc1cSThomas Gleixner static inline void tick_broadcast_init(void) { } 99b7475eb5SThomas Gleixner static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; } 100f8381cbaSThomas Gleixner 101b7475eb5SThomas Gleixner /* Set the periodic handler in non broadcast mode */ 102b7475eb5SThomas Gleixner static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast) 103f8381cbaSThomas Gleixner { 104f8381cbaSThomas Gleixner dev->event_handler = tick_handle_periodic; 105f8381cbaSThomas Gleixner } 106f8381cbaSThomas Gleixner #endif /* !BROADCAST */ 107f8381cbaSThomas Gleixner 108b7475eb5SThomas Gleixner /* Functions related to oneshot broadcasting */ 109b7475eb5SThomas Gleixner #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) 110b7475eb5SThomas Gleixner extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc); 111b7475eb5SThomas Gleixner extern int tick_broadcast_oneshot_control(unsigned long reason); 112b7475eb5SThomas Gleixner extern void tick_broadcast_switch_to_oneshot(void); 113b7475eb5SThomas Gleixner extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup); 114b7475eb5SThomas Gleixner extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc); 115b7475eb5SThomas Gleixner extern int tick_broadcast_oneshot_active(void); 116b7475eb5SThomas Gleixner extern void tick_check_oneshot_broadcast_this_cpu(void); 117b7475eb5SThomas Gleixner bool tick_broadcast_oneshot_available(void); 118c1797bafSThomas Gleixner extern struct cpumask *tick_get_broadcast_oneshot_mask(void); 119b7475eb5SThomas Gleixner #else /* BROADCAST && ONESHOT */ 120b7475eb5SThomas Gleixner static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) { BUG(); } 121b7475eb5SThomas Gleixner static inline int tick_broadcast_oneshot_control(unsigned long reason) { return 0; } 122b7475eb5SThomas Gleixner static inline void tick_broadcast_switch_to_oneshot(void) { } 123b7475eb5SThomas Gleixner static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { } 124b7475eb5SThomas Gleixner static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc) { return 0; } 125b7475eb5SThomas Gleixner static inline int tick_broadcast_oneshot_active(void) { return 0; } 126b7475eb5SThomas Gleixner static inline void tick_check_oneshot_broadcast_this_cpu(void) { } 127b7475eb5SThomas Gleixner static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); } 128b7475eb5SThomas Gleixner #endif /* !BROADCAST && ONESHOT */ 129e2830b5cSTorben Hohn 130b7475eb5SThomas Gleixner /* NO_HZ_FULL internal */ 131b7475eb5SThomas Gleixner #ifdef CONFIG_NO_HZ_FULL 132b7475eb5SThomas Gleixner extern void tick_nohz_init(void); 133b7475eb5SThomas Gleixner # else 134b7475eb5SThomas Gleixner static inline void tick_nohz_init(void) { } 135b7475eb5SThomas Gleixner #endif 136