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 76441402bSThomas Gleixner #define TICK_DO_TIMER_NONE -1 86441402bSThomas Gleixner #define TICK_DO_TIMER_BOOT -2 96441402bSThomas Gleixner 10f8381cbaSThomas Gleixner DECLARE_PER_CPU(struct tick_device, tick_cpu_device); 11f8381cbaSThomas Gleixner extern ktime_t tick_next_period; 12f8381cbaSThomas Gleixner extern ktime_t tick_period; 13d3ed7824SThomas Gleixner extern int tick_do_timer_cpu __read_mostly; 14f8381cbaSThomas Gleixner 15f8381cbaSThomas Gleixner extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast); 16f8381cbaSThomas Gleixner extern void tick_handle_periodic(struct clock_event_device *dev); 17f8381cbaSThomas Gleixner 182344abbcSThomas Gleixner extern void clockevents_shutdown(struct clock_event_device *dev); 192344abbcSThomas Gleixner 20f8381cbaSThomas Gleixner /* 2179bf2bb3SThomas Gleixner * NO_HZ / high resolution timer shared code 2279bf2bb3SThomas Gleixner */ 2379bf2bb3SThomas Gleixner #ifdef CONFIG_TICK_ONESHOT 2479bf2bb3SThomas Gleixner extern void tick_setup_oneshot(struct clock_event_device *newdev, 2579bf2bb3SThomas Gleixner void (*handler)(struct clock_event_device *), 2679bf2bb3SThomas Gleixner ktime_t nextevt); 271fb9b7d2SThomas Gleixner extern int tick_dev_program_event(struct clock_event_device *dev, 281fb9b7d2SThomas Gleixner ktime_t expires, int force); 2979bf2bb3SThomas Gleixner extern int tick_program_event(ktime_t expires, int force); 3079bf2bb3SThomas Gleixner extern void tick_oneshot_notify(void); 3179bf2bb3SThomas Gleixner extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *)); 32cd05a1f8SThomas Gleixner extern void tick_resume_oneshot(void); 3379bf2bb3SThomas Gleixner # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 3479bf2bb3SThomas Gleixner extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc); 3579bf2bb3SThomas Gleixner extern void tick_broadcast_oneshot_control(unsigned long reason); 3679bf2bb3SThomas Gleixner extern void tick_broadcast_switch_to_oneshot(void); 3779bf2bb3SThomas Gleixner extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup); 38cd05a1f8SThomas Gleixner extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc); 3927ce4cb4SThomas Gleixner extern int tick_broadcast_oneshot_active(void); 40fb02fbc1SThomas Gleixner extern void tick_check_oneshot_broadcast(int cpu); 4179bf2bb3SThomas Gleixner # else /* BROADCAST */ 4279bf2bb3SThomas Gleixner static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) 4379bf2bb3SThomas Gleixner { 4479bf2bb3SThomas Gleixner BUG(); 4579bf2bb3SThomas Gleixner } 4679bf2bb3SThomas Gleixner static inline void tick_broadcast_oneshot_control(unsigned long reason) { } 4779bf2bb3SThomas Gleixner static inline void tick_broadcast_switch_to_oneshot(void) { } 4879bf2bb3SThomas Gleixner static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { } 4927ce4cb4SThomas Gleixner static inline int tick_broadcast_oneshot_active(void) { return 0; } 50fb02fbc1SThomas Gleixner static inline void tick_check_oneshot_broadcast(int cpu) { } 5179bf2bb3SThomas Gleixner # endif /* !BROADCAST */ 5279bf2bb3SThomas Gleixner 5379bf2bb3SThomas Gleixner #else /* !ONESHOT */ 5479bf2bb3SThomas Gleixner static inline 5579bf2bb3SThomas Gleixner void tick_setup_oneshot(struct clock_event_device *newdev, 5679bf2bb3SThomas Gleixner void (*handler)(struct clock_event_device *), 5779bf2bb3SThomas Gleixner ktime_t nextevt) 5879bf2bb3SThomas Gleixner { 5979bf2bb3SThomas Gleixner BUG(); 6079bf2bb3SThomas Gleixner } 61cd05a1f8SThomas Gleixner static inline void tick_resume_oneshot(void) 62cd05a1f8SThomas Gleixner { 63cd05a1f8SThomas Gleixner BUG(); 64cd05a1f8SThomas Gleixner } 6579bf2bb3SThomas Gleixner static inline int tick_program_event(ktime_t expires, int force) 6679bf2bb3SThomas Gleixner { 6779bf2bb3SThomas Gleixner return 0; 6879bf2bb3SThomas Gleixner } 6979bf2bb3SThomas Gleixner static inline void tick_oneshot_notify(void) { } 7079bf2bb3SThomas Gleixner static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) 7179bf2bb3SThomas Gleixner { 7279bf2bb3SThomas Gleixner BUG(); 7379bf2bb3SThomas Gleixner } 7479bf2bb3SThomas Gleixner static inline void tick_broadcast_oneshot_control(unsigned long reason) { } 7579bf2bb3SThomas Gleixner static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { } 76cd05a1f8SThomas Gleixner static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc) 77cd05a1f8SThomas Gleixner { 78cd05a1f8SThomas Gleixner return 0; 79cd05a1f8SThomas Gleixner } 80f8e256c6SIngo Molnar static inline int tick_broadcast_oneshot_active(void) { return 0; } 8179bf2bb3SThomas Gleixner #endif /* !TICK_ONESHOT */ 8279bf2bb3SThomas Gleixner 8379bf2bb3SThomas Gleixner /* 84f8381cbaSThomas Gleixner * Broadcasting support 85f8381cbaSThomas Gleixner */ 86f8381cbaSThomas Gleixner #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 87f8381cbaSThomas Gleixner extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); 88f8381cbaSThomas Gleixner extern int tick_check_broadcast_device(struct clock_event_device *dev); 89f8381cbaSThomas Gleixner extern int tick_is_broadcast_device(struct clock_event_device *dev); 90f8381cbaSThomas Gleixner extern void tick_broadcast_on_off(unsigned long reason, int *oncpu); 91f8381cbaSThomas Gleixner extern void tick_shutdown_broadcast(unsigned int *cpup); 926321dd60SThomas Gleixner extern void tick_suspend_broadcast(void); 936321dd60SThomas Gleixner extern int tick_resume_broadcast(void); 94f8381cbaSThomas Gleixner 95f8381cbaSThomas Gleixner extern void 96f8381cbaSThomas Gleixner tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); 97f8381cbaSThomas Gleixner 98f8381cbaSThomas Gleixner #else /* !BROADCAST */ 99f8381cbaSThomas Gleixner 100f8381cbaSThomas Gleixner static inline int tick_check_broadcast_device(struct clock_event_device *dev) 101f8381cbaSThomas Gleixner { 102f8381cbaSThomas Gleixner return 0; 103f8381cbaSThomas Gleixner } 104f8381cbaSThomas Gleixner 105f8381cbaSThomas Gleixner static inline int tick_is_broadcast_device(struct clock_event_device *dev) 106f8381cbaSThomas Gleixner { 107f8381cbaSThomas Gleixner return 0; 108f8381cbaSThomas Gleixner } 109f8381cbaSThomas Gleixner static inline int tick_device_uses_broadcast(struct clock_event_device *dev, 110f8381cbaSThomas Gleixner int cpu) 111f8381cbaSThomas Gleixner { 112f8381cbaSThomas Gleixner return 0; 113f8381cbaSThomas Gleixner } 114f8381cbaSThomas Gleixner static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } 115f8381cbaSThomas Gleixner static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { } 116f8381cbaSThomas Gleixner static inline void tick_shutdown_broadcast(unsigned int *cpup) { } 1176321dd60SThomas Gleixner static inline void tick_suspend_broadcast(void) { } 1186321dd60SThomas Gleixner static inline int tick_resume_broadcast(void) { return 0; } 119f8381cbaSThomas Gleixner 120f8381cbaSThomas Gleixner /* 121f8381cbaSThomas Gleixner * Set the periodic handler in non broadcast mode 122f8381cbaSThomas Gleixner */ 123f8381cbaSThomas Gleixner static inline void tick_set_periodic_handler(struct clock_event_device *dev, 124f8381cbaSThomas Gleixner int broadcast) 125f8381cbaSThomas Gleixner { 126f8381cbaSThomas Gleixner dev->event_handler = tick_handle_periodic; 127f8381cbaSThomas Gleixner } 128f8381cbaSThomas Gleixner #endif /* !BROADCAST */ 129f8381cbaSThomas Gleixner 130f8381cbaSThomas Gleixner /* 131f8381cbaSThomas Gleixner * Check, if the device is functional or a dummy for broadcast 132f8381cbaSThomas Gleixner */ 133f8381cbaSThomas Gleixner static inline int tick_device_is_functional(struct clock_event_device *dev) 134f8381cbaSThomas Gleixner { 135f8381cbaSThomas Gleixner return !(dev->features & CLOCK_EVT_FEAT_DUMMY); 136f8381cbaSThomas Gleixner } 137e2830b5cSTorben Hohn 138e2830b5cSTorben Hohn extern void do_timer(unsigned long ticks); 139e2830b5cSTorben Hohn extern seqlock_t xtime_lock; 140