NOHZ: restart tick device from irq_enter()
[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 extern void tick_check_oneshot_broadcast(int cpu);
40 # else /* BROADCAST */
41 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
42 {
43         BUG();
44 }
45 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
46 static inline void tick_broadcast_switch_to_oneshot(void) { }
47 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
48 static inline int tick_broadcast_oneshot_active(void) { return 0; }
49 static inline void tick_check_oneshot_broadcast(int cpu) { }
50 # endif /* !BROADCAST */
51
52 #else /* !ONESHOT */
53 static inline
54 void tick_setup_oneshot(struct clock_event_device *newdev,
55                         void (*handler)(struct clock_event_device *),
56                         ktime_t nextevt)
57 {
58         BUG();
59 }
60 static inline void tick_resume_oneshot(void)
61 {
62         BUG();
63 }
64 static inline int tick_program_event(ktime_t expires, int force)
65 {
66         return 0;
67 }
68 static inline void tick_oneshot_notify(void) { }
69 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
70 {
71         BUG();
72 }
73 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
74 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
75 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
76 {
77         return 0;
78 }
79 static inline int tick_broadcast_oneshot_active(void) { return 0; }
80 #endif /* !TICK_ONESHOT */
81
82 /*
83  * Broadcasting support
84  */
85 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
86 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
87 extern int tick_check_broadcast_device(struct clock_event_device *dev);
88 extern int tick_is_broadcast_device(struct clock_event_device *dev);
89 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
90 extern void tick_shutdown_broadcast(unsigned int *cpup);
91 extern void tick_suspend_broadcast(void);
92 extern int tick_resume_broadcast(void);
93
94 extern void
95 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
96
97 #else /* !BROADCAST */
98
99 static inline int tick_check_broadcast_device(struct clock_event_device *dev)
100 {
101         return 0;
102 }
103
104 static inline int tick_is_broadcast_device(struct clock_event_device *dev)
105 {
106         return 0;
107 }
108 static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
109                                              int cpu)
110 {
111         return 0;
112 }
113 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
114 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
115 static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
116 static inline void tick_suspend_broadcast(void) { }
117 static inline int tick_resume_broadcast(void) { return 0; }
118
119 /*
120  * Set the periodic handler in non broadcast mode
121  */
122 static inline void tick_set_periodic_handler(struct clock_event_device *dev,
123                                              int broadcast)
124 {
125         dev->event_handler = tick_handle_periodic;
126 }
127 #endif /* !BROADCAST */
128
129 /*
130  * Check, if the device is functional or a dummy for broadcast
131  */
132 static inline int tick_device_is_functional(struct clock_event_device *dev)
133 {
134         return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
135 }