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); 23a49b116dSThomas Gleixner extern void tick_shutdown(unsigned int cpu); 248c53daf6SThomas Gleixner extern void tick_suspend(void); 25f46481d0SThomas 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); 29c1797bafSThomas Gleixner extern int tick_is_oneshot_available(void); 307270d11cSThomas Gleixner extern struct tick_device *tick_get_device(int cpu); 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); 427270d11cSThomas Gleixner extern void clockevents_set_state(struct clock_event_device *dev, 437270d11cSThomas Gleixner enum clock_event_state state); 447270d11cSThomas Gleixner extern int clockevents_program_event(struct clock_event_device *dev, 457270d11cSThomas Gleixner ktime_t expires, bool force); 46c1797bafSThomas Gleixner extern void clockevents_handle_noop(struct clock_event_device *dev); 47b7475eb5SThomas Gleixner extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq); 48891292a7SPatrick Palka extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt); 4979bf2bb3SThomas Gleixner 50b7475eb5SThomas Gleixner /* Broadcasting support */ 51f8381cbaSThomas Gleixner # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 52f8381cbaSThomas Gleixner extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); 537172a286SThomas Gleixner extern void tick_install_broadcast_device(struct clock_event_device *dev); 54f8381cbaSThomas Gleixner extern int tick_is_broadcast_device(struct clock_event_device *dev); 55a49b116dSThomas Gleixner extern void tick_shutdown_broadcast(unsigned int cpu); 566321dd60SThomas Gleixner extern void tick_suspend_broadcast(void); 57f46481d0SThomas Gleixner extern void tick_resume_broadcast(void); 58f46481d0SThomas Gleixner extern bool tick_resume_check_broadcast(void); 59b352bc1cSThomas Gleixner extern void tick_broadcast_init(void); 60b7475eb5SThomas Gleixner extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); 61b7475eb5SThomas Gleixner extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq); 62c1797bafSThomas Gleixner extern struct tick_device *tick_get_broadcast_device(void); 63c1797bafSThomas Gleixner extern struct cpumask *tick_get_broadcast_mask(void); 643ae7a939SIngo Molnar # else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */ 65b7475eb5SThomas Gleixner static inline void tick_install_broadcast_device(struct clock_event_device *dev) { } 66b7475eb5SThomas Gleixner static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; } 67b7475eb5SThomas Gleixner static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; } 68f8381cbaSThomas Gleixner static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } 69a49b116dSThomas Gleixner static inline void tick_shutdown_broadcast(unsigned int cpu) { } 706321dd60SThomas Gleixner static inline void tick_suspend_broadcast(void) { } 71f46481d0SThomas Gleixner static inline void tick_resume_broadcast(void) { } 72f46481d0SThomas Gleixner static inline bool tick_resume_check_broadcast(void) { return false; } 73b352bc1cSThomas Gleixner static inline void tick_broadcast_init(void) { } 74b7475eb5SThomas Gleixner static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; } 75f8381cbaSThomas Gleixner 76b7475eb5SThomas Gleixner /* Set the periodic handler in non broadcast mode */ 77b7475eb5SThomas Gleixner static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast) 78f8381cbaSThomas Gleixner { 79f8381cbaSThomas Gleixner dev->event_handler = tick_handle_periodic; 80f8381cbaSThomas Gleixner } 813ae7a939SIngo Molnar # endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */ 823ae7a939SIngo Molnar 833ae7a939SIngo Molnar #else /* !GENERIC_CLOCKEVENTS: */ 843ae7a939SIngo Molnar static inline void tick_suspend(void) { } 853ae7a939SIngo Molnar static inline void tick_resume(void) { } 863ae7a939SIngo Molnar #endif /* !GENERIC_CLOCKEVENTS */ 873ae7a939SIngo Molnar 883ae7a939SIngo Molnar /* Oneshot related functions */ 893ae7a939SIngo Molnar #ifdef CONFIG_TICK_ONESHOT 903ae7a939SIngo Molnar extern void tick_setup_oneshot(struct clock_event_device *newdev, 913ae7a939SIngo Molnar void (*handler)(struct clock_event_device *), 923ae7a939SIngo Molnar ktime_t nextevt); 933ae7a939SIngo Molnar extern int tick_program_event(ktime_t expires, int force); 943ae7a939SIngo Molnar extern void tick_oneshot_notify(void); 953ae7a939SIngo Molnar extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *)); 963ae7a939SIngo Molnar extern void tick_resume_oneshot(void); 973ae7a939SIngo Molnar static inline bool tick_oneshot_possible(void) { return true; } 983ae7a939SIngo Molnar extern int tick_oneshot_mode_active(void); 993ae7a939SIngo Molnar extern void tick_clock_notify(void); 1003ae7a939SIngo Molnar extern int tick_check_oneshot_change(int allow_nohz); 1013ae7a939SIngo Molnar extern int tick_init_highres(void); 1023ae7a939SIngo Molnar #else /* !CONFIG_TICK_ONESHOT: */ 1033ae7a939SIngo Molnar static inline 1043ae7a939SIngo Molnar void tick_setup_oneshot(struct clock_event_device *newdev, 1053ae7a939SIngo Molnar void (*handler)(struct clock_event_device *), 1063ae7a939SIngo Molnar ktime_t nextevt) { BUG(); } 1073ae7a939SIngo Molnar static inline void tick_resume_oneshot(void) { BUG(); } 1083ae7a939SIngo Molnar static inline int tick_program_event(ktime_t expires, int force) { return 0; } 1093ae7a939SIngo Molnar static inline void tick_oneshot_notify(void) { } 1103ae7a939SIngo Molnar static inline bool tick_oneshot_possible(void) { return false; } 1113ae7a939SIngo Molnar static inline int tick_oneshot_mode_active(void) { return 0; } 1123ae7a939SIngo Molnar static inline void tick_clock_notify(void) { } 1133ae7a939SIngo Molnar static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } 1143ae7a939SIngo Molnar #endif /* !CONFIG_TICK_ONESHOT */ 115f8381cbaSThomas Gleixner 116b7475eb5SThomas Gleixner /* Functions related to oneshot broadcasting */ 117b7475eb5SThomas Gleixner #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) 118b7475eb5SThomas Gleixner extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc); 119b7475eb5SThomas Gleixner extern void tick_broadcast_switch_to_oneshot(void); 120a49b116dSThomas Gleixner extern void tick_shutdown_broadcast_oneshot(unsigned int cpu); 121b7475eb5SThomas Gleixner extern int tick_broadcast_oneshot_active(void); 122b7475eb5SThomas Gleixner extern void tick_check_oneshot_broadcast_this_cpu(void); 123b7475eb5SThomas Gleixner bool tick_broadcast_oneshot_available(void); 124c1797bafSThomas Gleixner extern struct cpumask *tick_get_broadcast_oneshot_mask(void); 1253ae7a939SIngo Molnar #else /* !(BROADCAST && ONESHOT): */ 126b7475eb5SThomas Gleixner static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) { BUG(); } 127b7475eb5SThomas Gleixner static inline void tick_broadcast_switch_to_oneshot(void) { } 128a49b116dSThomas Gleixner static inline void tick_shutdown_broadcast_oneshot(unsigned int cpu) { } 129b7475eb5SThomas Gleixner static inline int tick_broadcast_oneshot_active(void) { return 0; } 130b7475eb5SThomas Gleixner static inline void tick_check_oneshot_broadcast_this_cpu(void) { } 131b7475eb5SThomas Gleixner static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); } 1323ae7a939SIngo Molnar #endif /* !(BROADCAST && ONESHOT) */ 133e2830b5cSTorben Hohn 134b7475eb5SThomas Gleixner /* NO_HZ_FULL internal */ 135b7475eb5SThomas Gleixner #ifdef CONFIG_NO_HZ_FULL 136b7475eb5SThomas Gleixner extern void tick_nohz_init(void); 137b7475eb5SThomas Gleixner # else 138b7475eb5SThomas Gleixner static inline void tick_nohz_init(void) { } 139b7475eb5SThomas Gleixner #endif 140c1ad348bSThomas Gleixner 141c1ad348bSThomas Gleixner extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem); 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