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_handover_do_timer(int *cpup);
24 extern void tick_shutdown(unsigned int *cpup);
25 extern void tick_suspend(void);
26 extern void tick_resume(void);
27 extern bool tick_check_replacement(struct clock_event_device *curdev,
28 struct clock_event_device *newdev);
29 extern void tick_install_replacement(struct clock_event_device *dev);
30 extern int tick_is_oneshot_available(void);
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_handle_noop(struct clock_event_device *dev);
43 extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq);
44 extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
46 static inline void tick_suspend(void) { }
47 static inline void tick_resume(void) { }
48 #endif /* GENERIC_CLOCKEVENTS */
50 /* Oneshot related functions */
51 #ifdef CONFIG_TICK_ONESHOT
52 extern void tick_setup_oneshot(struct clock_event_device *newdev,
53 void (*handler)(struct clock_event_device *),
55 extern int tick_program_event(ktime_t expires, int force);
56 extern void tick_oneshot_notify(void);
57 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
58 extern void tick_resume_oneshot(void);
59 static inline bool tick_oneshot_possible(void) { return true; }
60 extern int tick_oneshot_mode_active(void);
61 extern void tick_clock_notify(void);
62 extern int tick_check_oneshot_change(int allow_nohz);
63 extern int tick_init_highres(void);
66 void tick_setup_oneshot(struct clock_event_device *newdev,
67 void (*handler)(struct clock_event_device *),
68 ktime_t nextevt) { BUG(); }
69 static inline void tick_resume_oneshot(void) { BUG(); }
70 static inline int tick_program_event(ktime_t expires, int force) { return 0; }
71 static inline void tick_oneshot_notify(void) { }
72 static inline bool tick_oneshot_possible(void) { return false; }
73 static inline int tick_oneshot_mode_active(void) { return 0; }
74 static inline void tick_clock_notify(void) { }
75 static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
76 #endif /* !TICK_ONESHOT */
78 /* Broadcasting support */
79 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
80 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
81 extern void tick_install_broadcast_device(struct clock_event_device *dev);
82 extern int tick_is_broadcast_device(struct clock_event_device *dev);
83 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
84 extern void tick_shutdown_broadcast(unsigned int *cpup);
85 extern void tick_suspend_broadcast(void);
86 extern void tick_resume_broadcast(void);
87 extern bool tick_resume_check_broadcast(void);
88 extern void tick_broadcast_init(void);
89 extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
90 extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
91 extern struct tick_device *tick_get_broadcast_device(void);
92 extern struct cpumask *tick_get_broadcast_mask(void);
93 #else /* !BROADCAST */
94 static inline void tick_install_broadcast_device(struct clock_event_device *dev) { }
95 static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; }
96 static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; }
97 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
98 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
99 static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
100 static inline void tick_suspend_broadcast(void) { }
101 static inline void tick_resume_broadcast(void) { }
102 static inline bool tick_resume_check_broadcast(void) { return false; }
103 static inline void tick_broadcast_init(void) { }
104 static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; }
106 /* Set the periodic handler in non broadcast mode */
107 static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast)
109 dev->event_handler = tick_handle_periodic;
111 #endif /* !BROADCAST */
113 /* Functions related to oneshot broadcasting */
114 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
115 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
116 extern int tick_broadcast_oneshot_control(unsigned long reason);
117 extern void tick_broadcast_switch_to_oneshot(void);
118 extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
119 extern int tick_broadcast_oneshot_active(void);
120 extern void tick_check_oneshot_broadcast_this_cpu(void);
121 bool tick_broadcast_oneshot_available(void);
122 extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
123 #else /* BROADCAST && ONESHOT */
124 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) { BUG(); }
125 static inline int tick_broadcast_oneshot_control(unsigned long reason) { return 0; }
126 static inline void tick_broadcast_switch_to_oneshot(void) { }
127 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
128 static inline int tick_broadcast_oneshot_active(void) { return 0; }
129 static inline void tick_check_oneshot_broadcast_this_cpu(void) { }
130 static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); }
131 #endif /* !BROADCAST && ONESHOT */
133 /* NO_HZ_FULL internal */
134 #ifdef CONFIG_NO_HZ_FULL
135 extern void tick_nohz_init(void);
137 static inline void tick_nohz_init(void) { }