2 * tick internal variable and functions used by low/high res code
4 #include <linux/hrtimer.h>
5 #include <linux/tick.h>
7 #include "timekeeping.h"
8 #include "tick-sched.h"
10 #ifdef CONFIG_GENERIC_CLOCKEVENTS
12 # define TICK_DO_TIMER_NONE -1
13 # define TICK_DO_TIMER_BOOT -2
15 DECLARE_PER_CPU(struct tick_device
, tick_cpu_device
);
16 extern ktime_t tick_next_period
;
17 extern ktime_t tick_period
;
18 extern int tick_do_timer_cpu __read_mostly
;
20 extern void tick_setup_periodic(struct clock_event_device
*dev
, int broadcast
);
21 extern void tick_handle_periodic(struct clock_event_device
*dev
);
22 extern void tick_check_new_device(struct clock_event_device
*dev
);
23 extern void tick_shutdown(unsigned int cpu
);
24 extern void tick_suspend(void);
25 extern void tick_resume(void);
26 extern bool tick_check_replacement(struct clock_event_device
*curdev
,
27 struct clock_event_device
*newdev
);
28 extern void tick_install_replacement(struct clock_event_device
*dev
);
29 extern int tick_is_oneshot_available(void);
30 extern struct tick_device
*tick_get_device(int cpu
);
32 extern int clockevents_tick_resume(struct clock_event_device
*dev
);
33 /* Check, if the device is functional or a dummy for broadcast */
34 static inline int tick_device_is_functional(struct clock_event_device
*dev
)
36 return !(dev
->features
& CLOCK_EVT_FEAT_DUMMY
);
39 extern void clockevents_shutdown(struct clock_event_device
*dev
);
40 extern void clockevents_exchange_device(struct clock_event_device
*old
,
41 struct clock_event_device
*new);
42 extern void clockevents_set_state(struct clock_event_device
*dev
,
43 enum clock_event_state state
);
44 extern int clockevents_program_event(struct clock_event_device
*dev
,
45 ktime_t expires
, bool force
);
46 extern void clockevents_handle_noop(struct clock_event_device
*dev
);
47 extern int __clockevents_update_freq(struct clock_event_device
*dev
, u32 freq
);
48 extern ssize_t
sysfs_get_uname(const char *buf
, char *dst
, size_t cnt
);
50 /* Broadcasting support */
51 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
52 extern int tick_device_uses_broadcast(struct clock_event_device
*dev
, int cpu
);
53 extern void tick_install_broadcast_device(struct clock_event_device
*dev
);
54 extern int tick_is_broadcast_device(struct clock_event_device
*dev
);
55 extern void tick_shutdown_broadcast(unsigned int cpu
);
56 extern void tick_suspend_broadcast(void);
57 extern void tick_resume_broadcast(void);
58 extern bool tick_resume_check_broadcast(void);
59 extern void tick_broadcast_init(void);
60 extern void tick_set_periodic_handler(struct clock_event_device
*dev
, int broadcast
);
61 extern int tick_broadcast_update_freq(struct clock_event_device
*dev
, u32 freq
);
62 extern struct tick_device
*tick_get_broadcast_device(void);
63 extern struct cpumask
*tick_get_broadcast_mask(void);
64 # else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */
65 static inline void tick_install_broadcast_device(struct clock_event_device
*dev
) { }
66 static inline int tick_is_broadcast_device(struct clock_event_device
*dev
) { return 0; }
67 static inline int tick_device_uses_broadcast(struct clock_event_device
*dev
, int cpu
) { return 0; }
68 static inline void tick_do_periodic_broadcast(struct clock_event_device
*d
) { }
69 static inline void tick_shutdown_broadcast(unsigned int cpu
) { }
70 static inline void tick_suspend_broadcast(void) { }
71 static inline void tick_resume_broadcast(void) { }
72 static inline bool tick_resume_check_broadcast(void) { return false; }
73 static inline void tick_broadcast_init(void) { }
74 static inline int tick_broadcast_update_freq(struct clock_event_device
*dev
, u32 freq
) { return -ENODEV
; }
76 /* Set the periodic handler in non broadcast mode */
77 static inline void tick_set_periodic_handler(struct clock_event_device
*dev
, int broadcast
)
79 dev
->event_handler
= tick_handle_periodic
;
81 # endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */
83 #else /* !GENERIC_CLOCKEVENTS: */
84 static inline void tick_suspend(void) { }
85 static inline void tick_resume(void) { }
86 #endif /* !GENERIC_CLOCKEVENTS */
88 /* Oneshot related functions */
89 #ifdef CONFIG_TICK_ONESHOT
90 extern void tick_setup_oneshot(struct clock_event_device
*newdev
,
91 void (*handler
)(struct clock_event_device
*),
93 extern int tick_program_event(ktime_t expires
, int force
);
94 extern void tick_oneshot_notify(void);
95 extern int tick_switch_to_oneshot(void (*handler
)(struct clock_event_device
*));
96 extern void tick_resume_oneshot(void);
97 static inline bool tick_oneshot_possible(void) { return true; }
98 extern int tick_oneshot_mode_active(void);
99 extern void tick_clock_notify(void);
100 extern int tick_check_oneshot_change(int allow_nohz
);
101 extern int tick_init_highres(void);
102 #else /* !CONFIG_TICK_ONESHOT: */
104 void tick_setup_oneshot(struct clock_event_device
*newdev
,
105 void (*handler
)(struct clock_event_device
*),
106 ktime_t nextevt
) { BUG(); }
107 static inline void tick_resume_oneshot(void) { BUG(); }
108 static inline int tick_program_event(ktime_t expires
, int force
) { return 0; }
109 static inline void tick_oneshot_notify(void) { }
110 static inline bool tick_oneshot_possible(void) { return false; }
111 static inline int tick_oneshot_mode_active(void) { return 0; }
112 static inline void tick_clock_notify(void) { }
113 static inline int tick_check_oneshot_change(int allow_nohz
) { return 0; }
114 #endif /* !CONFIG_TICK_ONESHOT */
116 /* Functions related to oneshot broadcasting */
117 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
118 extern void tick_broadcast_setup_oneshot(struct clock_event_device
*bc
);
119 extern void tick_broadcast_switch_to_oneshot(void);
120 extern void tick_shutdown_broadcast_oneshot(unsigned int cpu
);
121 extern int tick_broadcast_oneshot_active(void);
122 extern void tick_check_oneshot_broadcast_this_cpu(void);
123 bool tick_broadcast_oneshot_available(void);
124 extern struct cpumask
*tick_get_broadcast_oneshot_mask(void);
125 #else /* !(BROADCAST && ONESHOT): */
126 static inline void tick_broadcast_setup_oneshot(struct clock_event_device
*bc
) { BUG(); }
127 static inline void tick_broadcast_switch_to_oneshot(void) { }
128 static inline void tick_shutdown_broadcast_oneshot(unsigned int cpu
) { }
129 static inline int tick_broadcast_oneshot_active(void) { return 0; }
130 static inline void tick_check_oneshot_broadcast_this_cpu(void) { }
131 static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); }
132 #endif /* !(BROADCAST && ONESHOT) */
134 /* NO_HZ_FULL internal */
135 #ifdef CONFIG_NO_HZ_FULL
136 extern void tick_nohz_init(void);
138 static inline void tick_nohz_init(void) { }