1 /* 2 * tick internal variable and functions used by low/high res code 3 */ 4 #include <linux/hrtimer.h> 5 #include <linux/tick.h> 6 7 #include "timekeeping.h" 8 #include "tick-sched.h" 9 10 #ifdef CONFIG_GENERIC_CLOCKEVENTS 11 12 # define TICK_DO_TIMER_NONE -1 13 # define TICK_DO_TIMER_BOOT -2 14 15 DECLARE_PER_CPU(struct tick_device, tick_cpu_device); 16 extern ktime_t tick_next_period; 17 extern ktime_t tick_period; 18 extern int tick_do_timer_cpu __read_mostly; 19 20 extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast); 21 extern void tick_handle_periodic(struct clock_event_device *dev); 22 extern void tick_check_new_device(struct clock_event_device *dev); 23 extern void tick_shutdown(unsigned int cpu); 24 extern void tick_suspend(void); 25 extern void tick_resume(void); 26 extern bool tick_check_replacement(struct clock_event_device *curdev, 27 struct clock_event_device *newdev); 28 extern void tick_install_replacement(struct clock_event_device *dev); 29 extern int tick_is_oneshot_available(void); 30 extern struct tick_device *tick_get_device(int cpu); 31 32 extern int clockevents_tick_resume(struct clock_event_device *dev); 33 /* Check, if the device is functional or a dummy for broadcast */ 34 static inline int tick_device_is_functional(struct clock_event_device *dev) 35 { 36 return !(dev->features & CLOCK_EVT_FEAT_DUMMY); 37 } 38 39 extern void clockevents_shutdown(struct clock_event_device *dev); 40 extern void clockevents_exchange_device(struct clock_event_device *old, 41 struct clock_event_device *new); 42 extern void clockevents_set_state(struct clock_event_device *dev, 43 enum clock_event_state state); 44 extern int clockevents_program_event(struct clock_event_device *dev, 45 ktime_t expires, bool force); 46 extern void clockevents_handle_noop(struct clock_event_device *dev); 47 extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq); 48 extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt); 49 50 /* Broadcasting support */ 51 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 52 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); 53 extern void tick_install_broadcast_device(struct clock_event_device *dev); 54 extern int tick_is_broadcast_device(struct clock_event_device *dev); 55 extern void tick_shutdown_broadcast(unsigned int cpu); 56 extern void tick_suspend_broadcast(void); 57 extern void tick_resume_broadcast(void); 58 extern bool tick_resume_check_broadcast(void); 59 extern void tick_broadcast_init(void); 60 extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); 61 extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq); 62 extern struct tick_device *tick_get_broadcast_device(void); 63 extern struct cpumask *tick_get_broadcast_mask(void); 64 # else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */ 65 static inline void tick_install_broadcast_device(struct clock_event_device *dev) { } 66 static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; } 67 static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; } 68 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } 69 static inline void tick_shutdown_broadcast(unsigned int cpu) { } 70 static inline void tick_suspend_broadcast(void) { } 71 static inline void tick_resume_broadcast(void) { } 72 static inline bool tick_resume_check_broadcast(void) { return false; } 73 static inline void tick_broadcast_init(void) { } 74 static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; } 75 76 /* Set the periodic handler in non broadcast mode */ 77 static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast) 78 { 79 dev->event_handler = tick_handle_periodic; 80 } 81 # endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */ 82 83 #else /* !GENERIC_CLOCKEVENTS: */ 84 static inline void tick_suspend(void) { } 85 static inline void tick_resume(void) { } 86 #endif /* !GENERIC_CLOCKEVENTS */ 87 88 /* Oneshot related functions */ 89 #ifdef CONFIG_TICK_ONESHOT 90 extern void tick_setup_oneshot(struct clock_event_device *newdev, 91 void (*handler)(struct clock_event_device *), 92 ktime_t nextevt); 93 extern int tick_program_event(ktime_t expires, int force); 94 extern void tick_oneshot_notify(void); 95 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *)); 96 extern void tick_resume_oneshot(void); 97 static inline bool tick_oneshot_possible(void) { return true; } 98 extern int tick_oneshot_mode_active(void); 99 extern void tick_clock_notify(void); 100 extern int tick_check_oneshot_change(int allow_nohz); 101 extern int tick_init_highres(void); 102 #else /* !CONFIG_TICK_ONESHOT: */ 103 static inline 104 void tick_setup_oneshot(struct clock_event_device *newdev, 105 void (*handler)(struct clock_event_device *), 106 ktime_t nextevt) { BUG(); } 107 static inline void tick_resume_oneshot(void) { BUG(); } 108 static inline int tick_program_event(ktime_t expires, int force) { return 0; } 109 static inline void tick_oneshot_notify(void) { } 110 static inline bool tick_oneshot_possible(void) { return false; } 111 static inline int tick_oneshot_mode_active(void) { return 0; } 112 static inline void tick_clock_notify(void) { } 113 static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } 114 #endif /* !CONFIG_TICK_ONESHOT */ 115 116 /* Functions related to oneshot broadcasting */ 117 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) 118 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc); 119 extern void tick_broadcast_switch_to_oneshot(void); 120 extern void tick_shutdown_broadcast_oneshot(unsigned int cpu); 121 extern int tick_broadcast_oneshot_active(void); 122 extern void tick_check_oneshot_broadcast_this_cpu(void); 123 bool tick_broadcast_oneshot_available(void); 124 extern struct cpumask *tick_get_broadcast_oneshot_mask(void); 125 #else /* !(BROADCAST && ONESHOT): */ 126 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) { BUG(); } 127 static inline void tick_broadcast_switch_to_oneshot(void) { } 128 static inline void tick_shutdown_broadcast_oneshot(unsigned int cpu) { } 129 static inline int tick_broadcast_oneshot_active(void) { return 0; } 130 static inline void tick_check_oneshot_broadcast_this_cpu(void) { } 131 static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); } 132 #endif /* !(BROADCAST && ONESHOT) */ 133 134 /* NO_HZ_FULL internal */ 135 #ifdef CONFIG_NO_HZ_FULL 136 extern void tick_nohz_init(void); 137 # else 138 static inline void tick_nohz_init(void) { } 139 #endif 140