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tick-internal.h
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1 /*
2  * tick internal variable and functions used by low/high res code
3  */
4 #include <linux/hrtimer.h>
5 #include <linux/tick.h>
6 
7 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD
8 
9 #define TICK_DO_TIMER_NONE -1
10 #define TICK_DO_TIMER_BOOT -2
11 
12 DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
14 extern ktime_t tick_period;
15 extern int tick_do_timer_cpu __read_mostly;
16 
17 extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
18 extern void tick_handle_periodic(struct clock_event_device *dev);
19 
20 extern void clockevents_shutdown(struct clock_event_device *dev);
21 
22 /*
23  * NO_HZ / high resolution timer shared code
24  */
25 #ifdef CONFIG_TICK_ONESHOT
26 extern void tick_setup_oneshot(struct clock_event_device *newdev,
27  void (*handler)(struct clock_event_device *),
28  ktime_t nextevt);
29 extern int tick_program_event(ktime_t expires, int force);
30 extern void tick_oneshot_notify(void);
31 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
32 extern void tick_resume_oneshot(void);
33 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
34 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
35 extern void tick_broadcast_oneshot_control(unsigned long reason);
36 extern void tick_broadcast_switch_to_oneshot(void);
37 extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
38 extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
39 extern int tick_broadcast_oneshot_active(void);
40 extern void tick_check_oneshot_broadcast(int cpu);
41 bool tick_broadcast_oneshot_available(void);
42 # else /* BROADCAST */
43 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
44 {
45  BUG();
46 }
47 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
48 static inline void tick_broadcast_switch_to_oneshot(void) { }
49 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
50 static inline int tick_broadcast_oneshot_active(void) { return 0; }
51 static inline void tick_check_oneshot_broadcast(int cpu) { }
52 static inline bool tick_broadcast_oneshot_available(void) { return true; }
53 # endif /* !BROADCAST */
54 
55 #else /* !ONESHOT */
56 static inline
57 void tick_setup_oneshot(struct clock_event_device *newdev,
58  void (*handler)(struct clock_event_device *),
59  ktime_t nextevt)
60 {
61  BUG();
62 }
63 static inline void tick_resume_oneshot(void)
64 {
65  BUG();
66 }
67 static inline int tick_program_event(ktime_t expires, int force)
68 {
69  return 0;
70 }
71 static inline void tick_oneshot_notify(void) { }
72 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
73 {
74  BUG();
75 }
76 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
77 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
78 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
79 {
80  return 0;
81 }
82 static inline int tick_broadcast_oneshot_active(void) { return 0; }
83 static inline bool tick_broadcast_oneshot_available(void) { return false; }
84 #endif /* !TICK_ONESHOT */
85 
86 /*
87  * Broadcasting support
88  */
89 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
90 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
91 extern int tick_check_broadcast_device(struct clock_event_device *dev);
92 extern int tick_is_broadcast_device(struct clock_event_device *dev);
93 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
94 extern void tick_shutdown_broadcast(unsigned int *cpup);
95 extern void tick_suspend_broadcast(void);
96 extern int tick_resume_broadcast(void);
97 
98 extern void
99 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
100 
101 #else /* !BROADCAST */
102 
103 static inline int tick_check_broadcast_device(struct clock_event_device *dev)
104 {
105  return 0;
106 }
107 
108 static inline int tick_is_broadcast_device(struct clock_event_device *dev)
109 {
110  return 0;
111 }
112 static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
113  int cpu)
114 {
115  return 0;
116 }
117 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
118 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
119 static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
120 static inline void tick_suspend_broadcast(void) { }
121 static inline int tick_resume_broadcast(void) { return 0; }
122 
123 /*
124  * Set the periodic handler in non broadcast mode
125  */
126 static inline void tick_set_periodic_handler(struct clock_event_device *dev,
127  int broadcast)
128 {
129  dev->event_handler = tick_handle_periodic;
130 }
131 #endif /* !BROADCAST */
132 
133 /*
134  * Check, if the device is functional or a dummy for broadcast
135  */
136 static inline int tick_device_is_functional(struct clock_event_device *dev)
137 {
138  return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
139 }
140 
141 #endif
142 
143 extern void do_timer(unsigned long ticks);
144 extern seqlock_t xtime_lock;