1 /* 2 * tick internal variable and functions used by low/high res code 3 */ 4 5 #define TICK_DO_TIMER_NONE -1 6 #define TICK_DO_TIMER_BOOT -2 7 8 DECLARE_PER_CPU(struct tick_device, tick_cpu_device); 9 extern spinlock_t tick_device_lock; 10 extern ktime_t tick_next_period; 11 extern ktime_t tick_period; 12 extern int tick_do_timer_cpu __read_mostly; 13 14 extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast); 15 extern void tick_handle_periodic(struct clock_event_device *dev); 16 17 extern void clockevents_shutdown(struct clock_event_device *dev); 18 19 /* 20 * NO_HZ / high resolution timer shared code 21 */ 22 #ifdef CONFIG_TICK_ONESHOT 23 extern void tick_setup_oneshot(struct clock_event_device *newdev, 24 void (*handler)(struct clock_event_device *), 25 ktime_t nextevt); 26 extern int tick_dev_program_event(struct clock_event_device *dev, 27 ktime_t expires, int force); 28 extern int tick_program_event(ktime_t expires, int force); 29 extern void tick_oneshot_notify(void); 30 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *)); 31 extern void tick_resume_oneshot(void); 32 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 33 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc); 34 extern void tick_broadcast_oneshot_control(unsigned long reason); 35 extern void tick_broadcast_switch_to_oneshot(void); 36 extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup); 37 extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc); 38 extern int tick_broadcast_oneshot_active(void); 39 extern void tick_check_oneshot_broadcast(int cpu); 40 # else /* BROADCAST */ 41 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) 42 { 43 BUG(); 44 } 45 static inline void tick_broadcast_oneshot_control(unsigned long reason) { } 46 static inline void tick_broadcast_switch_to_oneshot(void) { } 47 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { } 48 static inline int tick_broadcast_oneshot_active(void) { return 0; } 49 static inline void tick_check_oneshot_broadcast(int cpu) { } 50 # endif /* !BROADCAST */ 51 52 #else /* !ONESHOT */ 53 static inline 54 void tick_setup_oneshot(struct clock_event_device *newdev, 55 void (*handler)(struct clock_event_device *), 56 ktime_t nextevt) 57 { 58 BUG(); 59 } 60 static inline void tick_resume_oneshot(void) 61 { 62 BUG(); 63 } 64 static inline int tick_program_event(ktime_t expires, int force) 65 { 66 return 0; 67 } 68 static inline void tick_oneshot_notify(void) { } 69 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) 70 { 71 BUG(); 72 } 73 static inline void tick_broadcast_oneshot_control(unsigned long reason) { } 74 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { } 75 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc) 76 { 77 return 0; 78 } 79 static inline int tick_broadcast_oneshot_active(void) { return 0; } 80 #endif /* !TICK_ONESHOT */ 81 82 /* 83 * Broadcasting support 84 */ 85 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 86 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); 87 extern int tick_check_broadcast_device(struct clock_event_device *dev); 88 extern int tick_is_broadcast_device(struct clock_event_device *dev); 89 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu); 90 extern void tick_shutdown_broadcast(unsigned int *cpup); 91 extern void tick_suspend_broadcast(void); 92 extern int tick_resume_broadcast(void); 93 94 extern void 95 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); 96 97 #else /* !BROADCAST */ 98 99 static inline int tick_check_broadcast_device(struct clock_event_device *dev) 100 { 101 return 0; 102 } 103 104 static inline int tick_is_broadcast_device(struct clock_event_device *dev) 105 { 106 return 0; 107 } 108 static inline int tick_device_uses_broadcast(struct clock_event_device *dev, 109 int cpu) 110 { 111 return 0; 112 } 113 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } 114 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { } 115 static inline void tick_shutdown_broadcast(unsigned int *cpup) { } 116 static inline void tick_suspend_broadcast(void) { } 117 static inline int tick_resume_broadcast(void) { return 0; } 118 119 /* 120 * Set the periodic handler in non broadcast mode 121 */ 122 static inline void tick_set_periodic_handler(struct clock_event_device *dev, 123 int broadcast) 124 { 125 dev->event_handler = tick_handle_periodic; 126 } 127 #endif /* !BROADCAST */ 128 129 /* 130 * Check, if the device is functional or a dummy for broadcast 131 */ 132 static inline int tick_device_is_functional(struct clock_event_device *dev) 133 { 134 return !(dev->features & CLOCK_EVT_FEAT_DUMMY); 135 } 136