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 extern seqlock_t jiffies_lock; 8 9 #define CS_NAME_LEN 32 10 11 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD 12 13 #define TICK_DO_TIMER_NONE -1 14 #define TICK_DO_TIMER_BOOT -2 15 16 DECLARE_PER_CPU(struct tick_device, tick_cpu_device); 17 extern ktime_t tick_next_period; 18 extern ktime_t tick_period; 19 extern int tick_do_timer_cpu __read_mostly; 20 21 extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast); 22 extern void tick_handle_periodic(struct clock_event_device *dev); 23 extern void tick_check_new_device(struct clock_event_device *dev); 24 extern void tick_handover_do_timer(int *cpup); 25 extern void tick_shutdown(unsigned int *cpup); 26 extern void tick_suspend(void); 27 extern void tick_resume(void); 28 extern bool tick_check_replacement(struct clock_event_device *curdev, 29 struct clock_event_device *newdev); 30 extern void tick_install_replacement(struct clock_event_device *dev); 31 32 extern void clockevents_shutdown(struct clock_event_device *dev); 33 34 extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt); 35 36 /* 37 * NO_HZ / high resolution timer shared code 38 */ 39 #ifdef CONFIG_TICK_ONESHOT 40 extern void tick_setup_oneshot(struct clock_event_device *newdev, 41 void (*handler)(struct clock_event_device *), 42 ktime_t nextevt); 43 extern int tick_program_event(ktime_t expires, int force); 44 extern void tick_oneshot_notify(void); 45 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *)); 46 extern void tick_resume_oneshot(void); 47 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 48 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc); 49 extern int tick_broadcast_oneshot_control(unsigned long reason); 50 extern void tick_broadcast_switch_to_oneshot(void); 51 extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup); 52 extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc); 53 extern int tick_broadcast_oneshot_active(void); 54 extern void tick_check_oneshot_broadcast_this_cpu(void); 55 bool tick_broadcast_oneshot_available(void); 56 # else /* BROADCAST */ 57 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) 58 { 59 BUG(); 60 } 61 static inline int tick_broadcast_oneshot_control(unsigned long reason) { return 0; } 62 static inline void tick_broadcast_switch_to_oneshot(void) { } 63 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { } 64 static inline int tick_broadcast_oneshot_active(void) { return 0; } 65 static inline void tick_check_oneshot_broadcast_this_cpu(void) { } 66 static inline bool tick_broadcast_oneshot_available(void) { return true; } 67 # endif /* !BROADCAST */ 68 69 #else /* !ONESHOT */ 70 static inline 71 void tick_setup_oneshot(struct clock_event_device *newdev, 72 void (*handler)(struct clock_event_device *), 73 ktime_t nextevt) 74 { 75 BUG(); 76 } 77 static inline void tick_resume_oneshot(void) 78 { 79 BUG(); 80 } 81 static inline int tick_program_event(ktime_t expires, int force) 82 { 83 return 0; 84 } 85 static inline void tick_oneshot_notify(void) { } 86 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) 87 { 88 BUG(); 89 } 90 static inline int tick_broadcast_oneshot_control(unsigned long reason) { return 0; } 91 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { } 92 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc) 93 { 94 return 0; 95 } 96 static inline int tick_broadcast_oneshot_active(void) { return 0; } 97 static inline bool tick_broadcast_oneshot_available(void) { return false; } 98 #endif /* !TICK_ONESHOT */ 99 100 /* 101 * Broadcasting support 102 */ 103 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 104 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); 105 extern void tick_install_broadcast_device(struct clock_event_device *dev); 106 extern int tick_is_broadcast_device(struct clock_event_device *dev); 107 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu); 108 extern void tick_shutdown_broadcast(unsigned int *cpup); 109 extern void tick_suspend_broadcast(void); 110 extern int tick_resume_broadcast(void); 111 extern void tick_broadcast_init(void); 112 extern void 113 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); 114 int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq); 115 116 #else /* !BROADCAST */ 117 118 static inline void tick_install_broadcast_device(struct clock_event_device *dev) 119 { 120 } 121 122 static inline int tick_is_broadcast_device(struct clock_event_device *dev) 123 { 124 return 0; 125 } 126 static inline int tick_device_uses_broadcast(struct clock_event_device *dev, 127 int cpu) 128 { 129 return 0; 130 } 131 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } 132 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { } 133 static inline void tick_shutdown_broadcast(unsigned int *cpup) { } 134 static inline void tick_suspend_broadcast(void) { } 135 static inline int tick_resume_broadcast(void) { return 0; } 136 static inline void tick_broadcast_init(void) { } 137 static inline int tick_broadcast_update_freq(struct clock_event_device *dev, 138 u32 freq) { return -ENODEV; } 139 140 /* 141 * Set the periodic handler in non broadcast mode 142 */ 143 static inline void tick_set_periodic_handler(struct clock_event_device *dev, 144 int broadcast) 145 { 146 dev->event_handler = tick_handle_periodic; 147 } 148 #endif /* !BROADCAST */ 149 150 /* 151 * Check, if the device is functional or a dummy for broadcast 152 */ 153 static inline int tick_device_is_functional(struct clock_event_device *dev) 154 { 155 return !(dev->features & CLOCK_EVT_FEAT_DUMMY); 156 } 157 158 int __clockevents_update_freq(struct clock_event_device *dev, u32 freq); 159 160 #endif 161 162 extern void do_timer(unsigned long ticks); 163 extern void update_wall_time(void); 164