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Thomas Gleixnerf8381cb2007-02-16 01:28:02 -08001/*
2 * tick internal variable and functions used by low/high res code
3 */
Torben Hohne2830b52011-01-27 16:00:32 +01004#include <linux/hrtimer.h>
5#include <linux/tick.h>
Thomas Gleixner64414022008-09-22 18:46:37 +02006
Thomas Gleixner7cf37e82011-02-01 09:34:58 +01007#ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD
Thomas Gleixner64414022008-09-22 18:46:37 +02008
9#define TICK_DO_TIMER_NONE -1
10#define TICK_DO_TIMER_BOOT -2
11
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080012DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080013extern ktime_t tick_next_period;
14extern ktime_t tick_period;
Thomas Gleixnerd3ed7822007-05-08 00:30:03 -070015extern int tick_do_timer_cpu __read_mostly;
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080016
17extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
18extern void tick_handle_periodic(struct clock_event_device *dev);
19
Thomas Gleixner2344abb2008-09-16 11:32:50 -070020extern void clockevents_shutdown(struct clock_event_device *dev);
21
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080022/*
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080023 * NO_HZ / high resolution timer shared code
24 */
25#ifdef CONFIG_TICK_ONESHOT
26extern void tick_setup_oneshot(struct clock_event_device *newdev,
27 void (*handler)(struct clock_event_device *),
28 ktime_t nextevt);
Thomas Gleixner1fb9b7d2008-09-03 21:37:14 +000029extern int tick_dev_program_event(struct clock_event_device *dev,
30 ktime_t expires, int force);
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080031extern int tick_program_event(ktime_t expires, int force);
32extern void tick_oneshot_notify(void);
33extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
Thomas Gleixnercd05a1f2007-03-17 00:25:52 +010034extern void tick_resume_oneshot(void);
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080035# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
36extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
37extern void tick_broadcast_oneshot_control(unsigned long reason);
38extern void tick_broadcast_switch_to_oneshot(void);
39extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
Thomas Gleixnercd05a1f2007-03-17 00:25:52 +010040extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
Thomas Gleixner27ce4cb2008-09-22 19:04:02 +020041extern int tick_broadcast_oneshot_active(void);
Thomas Gleixnerfb02fbc2008-10-17 10:01:23 +020042extern void tick_check_oneshot_broadcast(int cpu);
Thomas Gleixner3a142a02011-02-25 22:34:23 +010043bool tick_broadcast_oneshot_available(void);
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080044# else /* BROADCAST */
45static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
46{
47 BUG();
48}
49static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
50static inline void tick_broadcast_switch_to_oneshot(void) { }
51static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
Thomas Gleixner27ce4cb2008-09-22 19:04:02 +020052static inline int tick_broadcast_oneshot_active(void) { return 0; }
Thomas Gleixnerfb02fbc2008-10-17 10:01:23 +020053static inline void tick_check_oneshot_broadcast(int cpu) { }
Thomas Gleixner3a142a02011-02-25 22:34:23 +010054static inline bool tick_broadcast_oneshot_available(void) { return true; }
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080055# endif /* !BROADCAST */
56
57#else /* !ONESHOT */
58static inline
59void tick_setup_oneshot(struct clock_event_device *newdev,
60 void (*handler)(struct clock_event_device *),
61 ktime_t nextevt)
62{
63 BUG();
64}
Thomas Gleixnercd05a1f2007-03-17 00:25:52 +010065static inline void tick_resume_oneshot(void)
66{
67 BUG();
68}
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080069static inline int tick_program_event(ktime_t expires, int force)
70{
71 return 0;
72}
73static inline void tick_oneshot_notify(void) { }
74static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
75{
76 BUG();
77}
78static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
79static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
Thomas Gleixnercd05a1f2007-03-17 00:25:52 +010080static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
81{
82 return 0;
83}
Ingo Molnarf8e256c2008-09-23 13:00:57 +020084static inline int tick_broadcast_oneshot_active(void) { return 0; }
Thomas Gleixner3a142a02011-02-25 22:34:23 +010085static inline bool tick_broadcast_oneshot_available(void) { return false; }
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -080086#endif /* !TICK_ONESHOT */
87
88/*
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080089 * Broadcasting support
90 */
91#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080092extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
93extern int tick_check_broadcast_device(struct clock_event_device *dev);
94extern int tick_is_broadcast_device(struct clock_event_device *dev);
95extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
96extern void tick_shutdown_broadcast(unsigned int *cpup);
Thomas Gleixner6321dd62007-03-06 08:25:42 +010097extern void tick_suspend_broadcast(void);
98extern int tick_resume_broadcast(void);
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -080099
100extern void
101tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
102
103#else /* !BROADCAST */
104
105static inline int tick_check_broadcast_device(struct clock_event_device *dev)
106{
107 return 0;
108}
109
110static inline int tick_is_broadcast_device(struct clock_event_device *dev)
111{
112 return 0;
113}
114static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
115 int cpu)
116{
117 return 0;
118}
119static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
120static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
121static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
Thomas Gleixner6321dd62007-03-06 08:25:42 +0100122static inline void tick_suspend_broadcast(void) { }
123static inline int tick_resume_broadcast(void) { return 0; }
Thomas Gleixnerf8381cb2007-02-16 01:28:02 -0800124
125/*
126 * Set the periodic handler in non broadcast mode
127 */
128static inline void tick_set_periodic_handler(struct clock_event_device *dev,
129 int broadcast)
130{
131 dev->event_handler = tick_handle_periodic;
132}
133#endif /* !BROADCAST */
134
135/*
136 * Check, if the device is functional or a dummy for broadcast
137 */
138static inline int tick_device_is_functional(struct clock_event_device *dev)
139{
140 return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
141}
Torben Hohne2830b52011-01-27 16:00:32 +0100142
Thomas Gleixner7cf37e82011-02-01 09:34:58 +0100143#endif
144
Torben Hohne2830b52011-01-27 16:00:32 +0100145extern void do_timer(unsigned long ticks);
146extern seqlock_t xtime_lock;