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); 26f46481d0SThomas 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); 454ffee521SThomas Gleixner #else 464ffee521SThomas Gleixner static inline void tick_suspend(void) { } 47f46481d0SThomas Gleixner static inline void tick_resume(void) { } 48b7475eb5SThomas Gleixner #endif /* GENERIC_CLOCKEVENTS */ 4903e13cf5SThomas Gleixner 50b7475eb5SThomas Gleixner /* Oneshot related functions */ 5179bf2bb3SThomas Gleixner #ifdef CONFIG_TICK_ONESHOT 5279bf2bb3SThomas Gleixner extern void tick_setup_oneshot(struct clock_event_device *newdev, 5379bf2bb3SThomas Gleixner void (*handler)(struct clock_event_device *), 5479bf2bb3SThomas Gleixner ktime_t nextevt); 5579bf2bb3SThomas Gleixner extern int tick_program_event(ktime_t expires, int force); 5679bf2bb3SThomas Gleixner extern void tick_oneshot_notify(void); 5779bf2bb3SThomas Gleixner extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *)); 58cd05a1f8SThomas Gleixner extern void tick_resume_oneshot(void); 59b7475eb5SThomas Gleixner static inline bool tick_oneshot_possible(void) { return true; } 60c1797bafSThomas Gleixner extern int tick_oneshot_mode_active(void); 61c1797bafSThomas Gleixner extern void tick_clock_notify(void); 62c1797bafSThomas Gleixner extern int tick_check_oneshot_change(int allow_nohz); 63c1797bafSThomas Gleixner extern int tick_init_highres(void); 6479bf2bb3SThomas Gleixner #else /* !ONESHOT */ 6579bf2bb3SThomas Gleixner static inline 6679bf2bb3SThomas Gleixner void tick_setup_oneshot(struct clock_event_device *newdev, 6779bf2bb3SThomas Gleixner void (*handler)(struct clock_event_device *), 68b7475eb5SThomas Gleixner ktime_t nextevt) { BUG(); } 69b7475eb5SThomas Gleixner static inline void tick_resume_oneshot(void) { BUG(); } 70b7475eb5SThomas Gleixner static inline int tick_program_event(ktime_t expires, int force) { return 0; } 7179bf2bb3SThomas Gleixner static inline void tick_oneshot_notify(void) { } 72b7475eb5SThomas Gleixner static inline bool tick_oneshot_possible(void) { return false; } 73c1797bafSThomas Gleixner static inline int tick_oneshot_mode_active(void) { return 0; } 74c1797bafSThomas Gleixner static inline void tick_clock_notify(void) { } 75c1797bafSThomas Gleixner static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } 7679bf2bb3SThomas Gleixner #endif /* !TICK_ONESHOT */ 7779bf2bb3SThomas Gleixner 78b7475eb5SThomas Gleixner /* Broadcasting support */ 79f8381cbaSThomas Gleixner #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 80f8381cbaSThomas Gleixner extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); 817172a286SThomas Gleixner extern void tick_install_broadcast_device(struct clock_event_device *dev); 82f8381cbaSThomas Gleixner extern int tick_is_broadcast_device(struct clock_event_device *dev); 83f8381cbaSThomas Gleixner extern void tick_broadcast_on_off(unsigned long reason, int *oncpu); 84f8381cbaSThomas Gleixner extern void tick_shutdown_broadcast(unsigned int *cpup); 856321dd60SThomas Gleixner extern void tick_suspend_broadcast(void); 86f46481d0SThomas Gleixner extern void tick_resume_broadcast(void); 87f46481d0SThomas Gleixner extern bool tick_resume_check_broadcast(void); 88b352bc1cSThomas Gleixner extern void tick_broadcast_init(void); 89b7475eb5SThomas Gleixner extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); 90b7475eb5SThomas Gleixner extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq); 91c1797bafSThomas Gleixner extern struct tick_device *tick_get_broadcast_device(void); 92c1797bafSThomas Gleixner extern struct cpumask *tick_get_broadcast_mask(void); 93f8381cbaSThomas Gleixner #else /* !BROADCAST */ 94b7475eb5SThomas Gleixner static inline void tick_install_broadcast_device(struct clock_event_device *dev) { } 95b7475eb5SThomas Gleixner static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; } 96b7475eb5SThomas Gleixner static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; } 97f8381cbaSThomas Gleixner static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } 98f8381cbaSThomas Gleixner static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { } 99f8381cbaSThomas Gleixner static inline void tick_shutdown_broadcast(unsigned int *cpup) { } 1006321dd60SThomas Gleixner static inline void tick_suspend_broadcast(void) { } 101f46481d0SThomas Gleixner static inline void tick_resume_broadcast(void) { } 102f46481d0SThomas Gleixner static inline bool tick_resume_check_broadcast(void) { return false; } 103b352bc1cSThomas Gleixner static inline void tick_broadcast_init(void) { } 104b7475eb5SThomas Gleixner static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; } 105f8381cbaSThomas Gleixner 106b7475eb5SThomas Gleixner /* Set the periodic handler in non broadcast mode */ 107b7475eb5SThomas Gleixner static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast) 108f8381cbaSThomas Gleixner { 109f8381cbaSThomas Gleixner dev->event_handler = tick_handle_periodic; 110f8381cbaSThomas Gleixner } 111f8381cbaSThomas Gleixner #endif /* !BROADCAST */ 112f8381cbaSThomas Gleixner 113b7475eb5SThomas Gleixner /* Functions related to oneshot broadcasting */ 114b7475eb5SThomas Gleixner #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) 115b7475eb5SThomas Gleixner extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc); 116b7475eb5SThomas Gleixner extern int tick_broadcast_oneshot_control(unsigned long reason); 117b7475eb5SThomas Gleixner extern void tick_broadcast_switch_to_oneshot(void); 118b7475eb5SThomas Gleixner extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup); 119b7475eb5SThomas Gleixner extern int tick_broadcast_oneshot_active(void); 120b7475eb5SThomas Gleixner extern void tick_check_oneshot_broadcast_this_cpu(void); 121b7475eb5SThomas Gleixner bool tick_broadcast_oneshot_available(void); 122c1797bafSThomas Gleixner extern struct cpumask *tick_get_broadcast_oneshot_mask(void); 123b7475eb5SThomas Gleixner #else /* BROADCAST && ONESHOT */ 124b7475eb5SThomas Gleixner static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) { BUG(); } 125b7475eb5SThomas Gleixner static inline int tick_broadcast_oneshot_control(unsigned long reason) { return 0; } 126b7475eb5SThomas Gleixner static inline void tick_broadcast_switch_to_oneshot(void) { } 127b7475eb5SThomas Gleixner static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { } 128b7475eb5SThomas Gleixner static inline int tick_broadcast_oneshot_active(void) { return 0; } 129b7475eb5SThomas Gleixner static inline void tick_check_oneshot_broadcast_this_cpu(void) { } 130b7475eb5SThomas Gleixner static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); } 131b7475eb5SThomas Gleixner #endif /* !BROADCAST && ONESHOT */ 132e2830b5cSTorben Hohn 133b7475eb5SThomas Gleixner /* NO_HZ_FULL internal */ 134b7475eb5SThomas Gleixner #ifdef CONFIG_NO_HZ_FULL 135b7475eb5SThomas Gleixner extern void tick_nohz_init(void); 136b7475eb5SThomas Gleixner # else 137b7475eb5SThomas Gleixner static inline void tick_nohz_init(void) { } 138b7475eb5SThomas Gleixner #endif 139