[PATCH] tick-management: dyntick / highres functionality
[linux-2.6.git] / kernel / time / tick-internal.h
1 /*
2  * tick internal variable and functions used by low/high res code
3  */
4 DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
5 extern spinlock_t tick_device_lock;
6 extern ktime_t tick_next_period;
7 extern ktime_t tick_period;
8
9 extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
10 extern void tick_handle_periodic(struct clock_event_device *dev);
11
12 /*
13  * NO_HZ / high resolution timer shared code
14  */
15 #ifdef CONFIG_TICK_ONESHOT
16 extern void tick_setup_oneshot(struct clock_event_device *newdev,
17                                void (*handler)(struct clock_event_device *),
18                                ktime_t nextevt);
19 extern int tick_program_event(ktime_t expires, int force);
20 extern void tick_oneshot_notify(void);
21 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
22
23 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
24 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
25 extern void tick_broadcast_oneshot_control(unsigned long reason);
26 extern void tick_broadcast_switch_to_oneshot(void);
27 extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
28 # else /* BROADCAST */
29 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
30 {
31         BUG();
32 }
33 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
34 static inline void tick_broadcast_switch_to_oneshot(void) { }
35 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
36 # endif /* !BROADCAST */
37
38 #else /* !ONESHOT */
39 static inline
40 void tick_setup_oneshot(struct clock_event_device *newdev,
41                         void (*handler)(struct clock_event_device *),
42                         ktime_t nextevt)
43 {
44         BUG();
45 }
46 static inline int tick_program_event(ktime_t expires, int force)
47 {
48         return 0;
49 }
50 static inline void tick_oneshot_notify(void) { }
51 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
52 {
53         BUG();
54 }
55 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
56 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
57 #endif /* !TICK_ONESHOT */
58
59 /*
60  * Broadcasting support
61  */
62 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
63 extern int tick_do_broadcast(cpumask_t mask);
64
65 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
66 extern int tick_check_broadcast_device(struct clock_event_device *dev);
67 extern int tick_is_broadcast_device(struct clock_event_device *dev);
68 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
69 extern void tick_shutdown_broadcast(unsigned int *cpup);
70
71 extern void
72 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
73
74 #else /* !BROADCAST */
75
76 static inline int tick_check_broadcast_device(struct clock_event_device *dev)
77 {
78         return 0;
79 }
80
81 static inline int tick_is_broadcast_device(struct clock_event_device *dev)
82 {
83         return 0;
84 }
85 static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
86                                              int cpu)
87 {
88         return 0;
89 }
90 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
91 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
92 static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
93
94 /*
95  * Set the periodic handler in non broadcast mode
96  */
97 static inline void tick_set_periodic_handler(struct clock_event_device *dev,
98                                              int broadcast)
99 {
100         dev->event_handler = tick_handle_periodic;
101 }
102 #endif /* !BROADCAST */
103
104 /*
105  * Check, if the device is functional or a dummy for broadcast
106  */
107 static inline int tick_device_is_functional(struct clock_event_device *dev)
108 {
109         return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
110 }