469248782c2355c0c2d31cf731dc8c692023268e
[linux-3.10.git] / kernel / time / tick-internal.h
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 }