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 # else /* BROADCAST */ 40 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) 41 { 42 BUG(); 43 } 44 static inline void tick_broadcast_oneshot_control(unsigned long reason) { } 45 static inline void tick_broadcast_switch_to_oneshot(void) { } 46 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { } 47 static inline int tick_broadcast_oneshot_active(void) { return 0; } 48 # endif /* !BROADCAST */ 49 50 #else /* !ONESHOT */ 51 static inline 52 void tick_setup_oneshot(struct clock_event_device *newdev, 53 void (*handler)(struct clock_event_device *), 54 ktime_t nextevt) 55 { 56 BUG(); 57 } 58 static inline void tick_resume_oneshot(void) 59 { 60 BUG(); 61 } 62 static inline int tick_program_event(ktime_t expires, int force) 63 { 64 return 0; 65 } 66 static inline void tick_oneshot_notify(void) { } 67 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) 68 { 69 BUG(); 70 } 71 static inline void tick_broadcast_oneshot_control(unsigned long reason) { } 72 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { } 73 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc) 74 { 75 return 0; 76 } 77 static inline int tick_broadcast_oneshot_active(void) { return 0; } 78 #endif /* !TICK_ONESHOT */ 79 80 /* 81 * Broadcasting support 82 */ 83 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 84 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); 85 extern int tick_check_broadcast_device(struct clock_event_device *dev); 86 extern int tick_is_broadcast_device(struct clock_event_device *dev); 87 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu); 88 extern void tick_shutdown_broadcast(unsigned int *cpup); 89 extern void tick_suspend_broadcast(void); 90 extern int tick_resume_broadcast(void); 91 92 extern void 93 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); 94 95 #else /* !BROADCAST */ 96 97 static inline int tick_check_broadcast_device(struct clock_event_device *dev) 98 { 99 return 0; 100 } 101 102 static inline int tick_is_broadcast_device(struct clock_event_device *dev) 103 { 104 return 0; 105 } 106 static inline int tick_device_uses_broadcast(struct clock_event_device *dev, 107 int cpu) 108 { 109 return 0; 110 } 111 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } 112 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { } 113 static inline void tick_shutdown_broadcast(unsigned int *cpup) { } 114 static inline void tick_suspend_broadcast(void) { } 115 static inline int tick_resume_broadcast(void) { return 0; } 116 117 /* 118 * Set the periodic handler in non broadcast mode 119 */ 120 static inline void tick_set_periodic_handler(struct clock_event_device *dev, 121 int broadcast) 122 { 123 dev->event_handler = tick_handle_periodic; 124 } 125 #endif /* !BROADCAST */ 126 127 /* 128 * Check, if the device is functional or a dummy for broadcast 129 */ 130 static inline int tick_device_is_functional(struct clock_event_device *dev) 131 { 132 return !(dev->features & CLOCK_EVT_FEAT_DUMMY); 133 } 134