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;
11 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD
13 #define TICK_DO_TIMER_NONE -1
14 #define TICK_DO_TIMER_BOOT -2
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;
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);
32 extern void clockevents_shutdown(struct clock_event_device *dev);
34 extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
37 * NO_HZ / high resolution timer shared code
39 #ifdef CONFIG_TICK_ONESHOT
40 extern void tick_setup_oneshot(struct clock_event_device *newdev,
41 void (*handler)(struct clock_event_device *),
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 void 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)
61 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
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 */
71 void tick_setup_oneshot(struct clock_event_device *newdev,
72 void (*handler)(struct clock_event_device *),
77 static inline void tick_resume_oneshot(void)
81 static inline int tick_program_event(ktime_t expires, int force)
85 static inline void tick_oneshot_notify(void) { }
86 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
90 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
91 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
92 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
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 */
101 * Broadcasting support
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);
113 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
115 #else /* !BROADCAST */
117 static inline void tick_install_broadcast_device(struct clock_event_device *dev)
121 static inline int tick_is_broadcast_device(struct clock_event_device *dev)
125 static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
130 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
131 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
132 static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
133 static inline void tick_suspend_broadcast(void) { }
134 static inline int tick_resume_broadcast(void) { return 0; }
135 static inline void tick_broadcast_init(void) { }
138 * Set the periodic handler in non broadcast mode
140 static inline void tick_set_periodic_handler(struct clock_event_device *dev,
143 dev->event_handler = tick_handle_periodic;
145 #endif /* !BROADCAST */
148 * Check, if the device is functional or a dummy for broadcast
150 static inline int tick_device_is_functional(struct clock_event_device *dev)
152 return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
157 extern void do_timer(unsigned long ticks);