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 static inline enum clock_event_state clockevent_get_state(struct clock_event_device *dev) 40 { 41 return dev->state_use_accessors; 42 } 43 44 static inline void clockevent_set_state(struct clock_event_device *dev, 45 enum clock_event_state state) 46 { 47 dev->state_use_accessors = state; 48 } 49 50 extern void clockevents_shutdown(struct clock_event_device *dev); 51 extern void clockevents_exchange_device(struct clock_event_device *old, 52 struct clock_event_device *new); 53 extern void clockevents_switch_state(struct clock_event_device *dev, 54 enum clock_event_state state); 55 extern int clockevents_program_event(struct clock_event_device *dev, 56 ktime_t expires, bool force); 57 extern void clockevents_handle_noop(struct clock_event_device *dev); 58 extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq); 59 extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt); 60 61 /* Broadcasting support */ 62 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 63 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); 64 extern void tick_install_broadcast_device(struct clock_event_device *dev); 65 extern int tick_is_broadcast_device(struct clock_event_device *dev); 66 extern void tick_shutdown_broadcast(unsigned int cpu); 67 extern void tick_suspend_broadcast(void); 68 extern void tick_resume_broadcast(void); 69 extern bool tick_resume_check_broadcast(void); 70 extern void tick_broadcast_init(void); 71 extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); 72 extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq); 73 extern struct tick_device *tick_get_broadcast_device(void); 74 extern struct cpumask *tick_get_broadcast_mask(void); 75 # else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */ 76 static inline void tick_install_broadcast_device(struct clock_event_device *dev) { } 77 static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; } 78 static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; } 79 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } 80 static inline void tick_shutdown_broadcast(unsigned int cpu) { } 81 static inline void tick_suspend_broadcast(void) { } 82 static inline void tick_resume_broadcast(void) { } 83 static inline bool tick_resume_check_broadcast(void) { return false; } 84 static inline void tick_broadcast_init(void) { } 85 static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; } 86 87 /* Set the periodic handler in non broadcast mode */ 88 static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast) 89 { 90 dev->event_handler = tick_handle_periodic; 91 } 92 # endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */ 93 94 #else /* !GENERIC_CLOCKEVENTS: */ 95 static inline void tick_suspend(void) { } 96 static inline void tick_resume(void) { } 97 #endif /* !GENERIC_CLOCKEVENTS */ 98 99 /* Oneshot related functions */ 100 #ifdef CONFIG_TICK_ONESHOT 101 extern void tick_setup_oneshot(struct clock_event_device *newdev, 102 void (*handler)(struct clock_event_device *), 103 ktime_t nextevt); 104 extern int tick_program_event(ktime_t expires, int force); 105 extern void tick_oneshot_notify(void); 106 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *)); 107 extern void tick_resume_oneshot(void); 108 static inline bool tick_oneshot_possible(void) { return true; } 109 extern int tick_oneshot_mode_active(void); 110 extern void tick_clock_notify(void); 111 extern int tick_check_oneshot_change(int allow_nohz); 112 extern int tick_init_highres(void); 113 #else /* !CONFIG_TICK_ONESHOT: */ 114 static inline 115 void tick_setup_oneshot(struct clock_event_device *newdev, 116 void (*handler)(struct clock_event_device *), 117 ktime_t nextevt) { BUG(); } 118 static inline void tick_resume_oneshot(void) { BUG(); } 119 static inline int tick_program_event(ktime_t expires, int force) { return 0; } 120 static inline void tick_oneshot_notify(void) { } 121 static inline bool tick_oneshot_possible(void) { return false; } 122 static inline int tick_oneshot_mode_active(void) { return 0; } 123 static inline void tick_clock_notify(void) { } 124 static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } 125 #endif /* !CONFIG_TICK_ONESHOT */ 126 127 /* Functions related to oneshot broadcasting */ 128 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) 129 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc); 130 extern void tick_broadcast_switch_to_oneshot(void); 131 extern void tick_shutdown_broadcast_oneshot(unsigned int cpu); 132 extern int tick_broadcast_oneshot_active(void); 133 extern void tick_check_oneshot_broadcast_this_cpu(void); 134 bool tick_broadcast_oneshot_available(void); 135 extern struct cpumask *tick_get_broadcast_oneshot_mask(void); 136 #else /* !(BROADCAST && ONESHOT): */ 137 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) { BUG(); } 138 static inline void tick_broadcast_switch_to_oneshot(void) { } 139 static inline void tick_shutdown_broadcast_oneshot(unsigned int cpu) { } 140 static inline int tick_broadcast_oneshot_active(void) { return 0; } 141 static inline void tick_check_oneshot_broadcast_this_cpu(void) { } 142 static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); } 143 #endif /* !(BROADCAST && ONESHOT) */ 144 145 /* NO_HZ_FULL internal */ 146 #ifdef CONFIG_NO_HZ_FULL 147 extern void tick_nohz_init(void); 148 # else 149 static inline void tick_nohz_init(void) { } 150 #endif 151 152 #ifdef CONFIG_NO_HZ_COMMON 153 extern unsigned long tick_nohz_active; 154 #else 155 #define tick_nohz_active (0) 156 #endif 157 158 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 159 extern void timers_update_migration(bool update_nohz); 160 #else 161 static inline void timers_update_migration(bool update_nohz) { } 162 #endif 163 164 DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases); 165 166 extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem); 167 void timer_clear_idle(void); 168