2 * tick internal variable and functions used by low/high res code
4 #include <linux/hrtimer.h>
5 #include <linux/tick.h>
7 extern seqlock_t jiffies_lock;
9 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD
11 #define TICK_DO_TIMER_NONE -1
12 #define TICK_DO_TIMER_BOOT -2
14 DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
15 extern ktime_t tick_next_period;
16 extern ktime_t tick_period;
17 extern int tick_do_timer_cpu __read_mostly;
19 extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
20 extern void tick_handle_periodic(struct clock_event_device *dev);
21 extern void tick_notify(unsigned long reason, void *dev);
22 extern void tick_check_new_device(struct clock_event_device *dev);
24 extern void clockevents_shutdown(struct clock_event_device *dev);
27 * NO_HZ / high resolution timer shared code
29 #ifdef CONFIG_TICK_ONESHOT
30 extern void tick_setup_oneshot(struct clock_event_device *newdev,
31 void (*handler)(struct clock_event_device *),
33 extern int tick_program_event(ktime_t expires, int force);
34 extern void tick_oneshot_notify(void);
35 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
36 extern void tick_resume_oneshot(void);
37 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
38 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
39 extern void tick_broadcast_oneshot_control(unsigned long reason);
40 extern void tick_broadcast_switch_to_oneshot(void);
41 extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
42 extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
43 extern int tick_broadcast_oneshot_active(void);
44 extern void tick_check_oneshot_broadcast(int cpu);
45 bool tick_broadcast_oneshot_available(void);
46 # else /* BROADCAST */
47 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
51 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
52 static inline void tick_broadcast_switch_to_oneshot(void) { }
53 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
54 static inline int tick_broadcast_oneshot_active(void) { return 0; }
55 static inline void tick_check_oneshot_broadcast(int cpu) { }
56 static inline bool tick_broadcast_oneshot_available(void) { return true; }
57 # endif /* !BROADCAST */
61 void tick_setup_oneshot(struct clock_event_device *newdev,
62 void (*handler)(struct clock_event_device *),
67 static inline void tick_resume_oneshot(void)
71 static inline int tick_program_event(ktime_t expires, int force)
75 static inline void tick_oneshot_notify(void) { }
76 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
80 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
81 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
82 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
86 static inline int tick_broadcast_oneshot_active(void) { return 0; }
87 static inline bool tick_broadcast_oneshot_available(void) { return false; }
88 #endif /* !TICK_ONESHOT */
91 * Broadcasting support
93 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
94 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
95 extern void tick_install_broadcast_device(struct clock_event_device *dev);
96 extern int tick_is_broadcast_device(struct clock_event_device *dev);
97 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
98 extern void tick_shutdown_broadcast(unsigned int *cpup);
99 extern void tick_suspend_broadcast(void);
100 extern int tick_resume_broadcast(void);
101 extern void tick_broadcast_init(void);
103 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
105 #else /* !BROADCAST */
107 static inline void tick_install_broadcast_device(struct clock_event_device *dev)
111 static inline int tick_is_broadcast_device(struct clock_event_device *dev)
115 static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
120 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
121 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
122 static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
123 static inline void tick_suspend_broadcast(void) { }
124 static inline int tick_resume_broadcast(void) { return 0; }
125 static inline void tick_broadcast_init(void) { }
128 * Set the periodic handler in non broadcast mode
130 static inline void tick_set_periodic_handler(struct clock_event_device *dev,
133 dev->event_handler = tick_handle_periodic;
135 #endif /* !BROADCAST */
138 * Check, if the device is functional or a dummy for broadcast
140 static inline int tick_device_is_functional(struct clock_event_device *dev)
142 return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
147 extern void do_timer(unsigned long ticks);