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" 88b094cd0SThomas Gleixner 99f083b74SThomas Gleixner #ifdef CONFIG_GENERIC_CLOCKEVENTS 106441402bSThomas Gleixner 116441402bSThomas Gleixner #define TICK_DO_TIMER_NONE -1 126441402bSThomas Gleixner #define TICK_DO_TIMER_BOOT -2 136441402bSThomas Gleixner 14f8381cbaSThomas Gleixner DECLARE_PER_CPU(struct tick_device, tick_cpu_device); 15f8381cbaSThomas Gleixner extern ktime_t tick_next_period; 16f8381cbaSThomas Gleixner extern ktime_t tick_period; 17d3ed7824SThomas Gleixner extern int tick_do_timer_cpu __read_mostly; 18f8381cbaSThomas Gleixner 19f8381cbaSThomas Gleixner extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast); 20f8381cbaSThomas Gleixner extern void tick_handle_periodic(struct clock_event_device *dev); 217172a286SThomas Gleixner extern void tick_check_new_device(struct clock_event_device *dev); 228c53daf6SThomas Gleixner extern void tick_handover_do_timer(int *cpup); 238c53daf6SThomas Gleixner extern void tick_shutdown(unsigned int *cpup); 248c53daf6SThomas Gleixner extern void tick_suspend(void); 258c53daf6SThomas Gleixner extern void tick_resume(void); 2603e13cf5SThomas Gleixner extern bool tick_check_replacement(struct clock_event_device *curdev, 2703e13cf5SThomas Gleixner struct clock_event_device *newdev); 2803e13cf5SThomas Gleixner extern void tick_install_replacement(struct clock_event_device *dev); 29f8381cbaSThomas Gleixner 30554ef387SViresh Kumar extern int clockevents_tick_resume(struct clock_event_device *dev); 31b7475eb5SThomas Gleixner /* Check, if the device is functional or a dummy for broadcast */ 32b7475eb5SThomas Gleixner static inline int tick_device_is_functional(struct clock_event_device *dev) 33b7475eb5SThomas Gleixner { 34b7475eb5SThomas Gleixner return !(dev->features & CLOCK_EVT_FEAT_DUMMY); 35b7475eb5SThomas Gleixner } 362344abbcSThomas Gleixner 37b7475eb5SThomas Gleixner extern void clockevents_shutdown(struct clock_event_device *dev); 38b7475eb5SThomas Gleixner extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq); 39891292a7SPatrick Palka extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt); 40b7475eb5SThomas Gleixner #endif /* GENERIC_CLOCKEVENTS */ 4103e13cf5SThomas Gleixner 42b7475eb5SThomas Gleixner /* Oneshot related functions */ 4379bf2bb3SThomas Gleixner #ifdef CONFIG_TICK_ONESHOT 4479bf2bb3SThomas Gleixner extern void tick_setup_oneshot(struct clock_event_device *newdev, 4579bf2bb3SThomas Gleixner void (*handler)(struct clock_event_device *), 4679bf2bb3SThomas Gleixner ktime_t nextevt); 4779bf2bb3SThomas Gleixner extern int tick_program_event(ktime_t expires, int force); 4879bf2bb3SThomas Gleixner extern void tick_oneshot_notify(void); 4979bf2bb3SThomas Gleixner extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *)); 50cd05a1f8SThomas Gleixner extern void tick_resume_oneshot(void); 51b7475eb5SThomas Gleixner static inline bool tick_oneshot_possible(void) { return true; } 5279bf2bb3SThomas Gleixner #else /* !ONESHOT */ 5379bf2bb3SThomas Gleixner static inline 5479bf2bb3SThomas Gleixner void tick_setup_oneshot(struct clock_event_device *newdev, 5579bf2bb3SThomas Gleixner void (*handler)(struct clock_event_device *), 56b7475eb5SThomas Gleixner ktime_t nextevt) { BUG(); } 57b7475eb5SThomas Gleixner static inline void tick_resume_oneshot(void) { BUG(); } 58b7475eb5SThomas Gleixner static inline int tick_program_event(ktime_t expires, int force) { return 0; } 5979bf2bb3SThomas Gleixner static inline void tick_oneshot_notify(void) { } 60b7475eb5SThomas Gleixner static inline bool tick_oneshot_possible(void) { return false; } 6179bf2bb3SThomas Gleixner #endif /* !TICK_ONESHOT */ 6279bf2bb3SThomas Gleixner 63b7475eb5SThomas Gleixner /* Broadcasting support */ 64f8381cbaSThomas Gleixner #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 65f8381cbaSThomas Gleixner extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); 667172a286SThomas Gleixner extern void tick_install_broadcast_device(struct clock_event_device *dev); 67f8381cbaSThomas Gleixner extern int tick_is_broadcast_device(struct clock_event_device *dev); 68f8381cbaSThomas Gleixner extern void tick_broadcast_on_off(unsigned long reason, int *oncpu); 69f8381cbaSThomas Gleixner extern void tick_shutdown_broadcast(unsigned int *cpup); 706321dd60SThomas Gleixner extern void tick_suspend_broadcast(void); 716321dd60SThomas Gleixner extern int tick_resume_broadcast(void); 72b352bc1cSThomas Gleixner extern void tick_broadcast_init(void); 73b7475eb5SThomas Gleixner extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); 74b7475eb5SThomas Gleixner extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq); 75f8381cbaSThomas Gleixner #else /* !BROADCAST */ 76b7475eb5SThomas Gleixner static inline void tick_install_broadcast_device(struct clock_event_device *dev) { } 77b7475eb5SThomas Gleixner static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; } 78b7475eb5SThomas Gleixner static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; } 79f8381cbaSThomas Gleixner static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } 80f8381cbaSThomas Gleixner static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { } 81f8381cbaSThomas Gleixner static inline void tick_shutdown_broadcast(unsigned int *cpup) { } 826321dd60SThomas Gleixner static inline void tick_suspend_broadcast(void) { } 836321dd60SThomas Gleixner static inline int tick_resume_broadcast(void) { return 0; } 84b352bc1cSThomas Gleixner static inline void tick_broadcast_init(void) { } 85b7475eb5SThomas Gleixner static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; } 86f8381cbaSThomas Gleixner 87b7475eb5SThomas Gleixner /* Set the periodic handler in non broadcast mode */ 88b7475eb5SThomas Gleixner static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast) 89f8381cbaSThomas Gleixner { 90f8381cbaSThomas Gleixner dev->event_handler = tick_handle_periodic; 91f8381cbaSThomas Gleixner } 92f8381cbaSThomas Gleixner #endif /* !BROADCAST */ 93f8381cbaSThomas Gleixner 94b7475eb5SThomas Gleixner /* Functions related to oneshot broadcasting */ 95b7475eb5SThomas Gleixner #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) 96b7475eb5SThomas Gleixner extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc); 97b7475eb5SThomas Gleixner extern int tick_broadcast_oneshot_control(unsigned long reason); 98b7475eb5SThomas Gleixner extern void tick_broadcast_switch_to_oneshot(void); 99b7475eb5SThomas Gleixner extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup); 100b7475eb5SThomas Gleixner extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc); 101b7475eb5SThomas Gleixner extern int tick_broadcast_oneshot_active(void); 102b7475eb5SThomas Gleixner extern void tick_check_oneshot_broadcast_this_cpu(void); 103b7475eb5SThomas Gleixner bool tick_broadcast_oneshot_available(void); 104b7475eb5SThomas Gleixner #else /* BROADCAST && ONESHOT */ 105b7475eb5SThomas Gleixner static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) { BUG(); } 106b7475eb5SThomas Gleixner static inline int tick_broadcast_oneshot_control(unsigned long reason) { return 0; } 107b7475eb5SThomas Gleixner static inline void tick_broadcast_switch_to_oneshot(void) { } 108b7475eb5SThomas Gleixner static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { } 109b7475eb5SThomas Gleixner static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc) { return 0; } 110b7475eb5SThomas Gleixner static inline int tick_broadcast_oneshot_active(void) { return 0; } 111b7475eb5SThomas Gleixner static inline void tick_check_oneshot_broadcast_this_cpu(void) { } 112b7475eb5SThomas Gleixner static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); } 113b7475eb5SThomas Gleixner #endif /* !BROADCAST && ONESHOT */ 114e2830b5cSTorben Hohn 115b7475eb5SThomas Gleixner /* NO_HZ_FULL internal */ 116b7475eb5SThomas Gleixner #ifdef CONFIG_NO_HZ_FULL 117b7475eb5SThomas Gleixner extern void tick_nohz_init(void); 118b7475eb5SThomas Gleixner # else 119b7475eb5SThomas Gleixner static inline void tick_nohz_init(void) { } 120b7475eb5SThomas Gleixner #endif 121