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1 | /* |
2 | * include/linux/hrtimer.h | |
3 | * | |
4 | * hrtimers - High-resolution kernel timers | |
5 | * | |
6 | * Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de> | |
7 | * Copyright(C) 2005, Red Hat, Inc., Ingo Molnar | |
8 | * | |
9 | * data type definitions, declarations, prototypes | |
10 | * | |
11 | * Started by: Thomas Gleixner and Ingo Molnar | |
12 | * | |
13 | * For licencing details see kernel-base/COPYING | |
14 | */ | |
15 | #ifndef _LINUX_HRTIMER_H | |
16 | #define _LINUX_HRTIMER_H | |
17 | ||
18 | #include <linux/rbtree.h> | |
19 | #include <linux/ktime.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/list.h> | |
22 | #include <linux/wait.h> | |
23 | ||
24 | /* | |
25 | * Mode arguments of xxx_hrtimer functions: | |
26 | */ | |
27 | enum hrtimer_mode { | |
28 | HRTIMER_ABS, /* Time value is absolute */ | |
29 | HRTIMER_REL, /* Time value is relative to now */ | |
30 | }; | |
31 | ||
32 | enum hrtimer_restart { | |
33 | HRTIMER_NORESTART, | |
34 | HRTIMER_RESTART, | |
35 | }; | |
36 | ||
37 | /* | |
38 | * Timer states: | |
39 | */ | |
40 | enum hrtimer_state { | |
41 | HRTIMER_INACTIVE, /* Timer is inactive */ | |
42 | HRTIMER_EXPIRED, /* Timer is expired */ | |
43 | HRTIMER_PENDING, /* Timer is pending */ | |
44 | }; | |
45 | ||
46 | struct hrtimer_base; | |
47 | ||
48 | /** | |
49 | * struct hrtimer - the basic hrtimer structure | |
50 | * | |
51 | * @node: red black tree node for time ordered insertion | |
52 | * @list: list head for easier access to the time ordered list, | |
53 | * without walking the red black tree. | |
54 | * @expires: the absolute expiry time in the hrtimers internal | |
55 | * representation. The time is related to the clock on | |
56 | * which the timer is based. | |
57 | * @state: state of the timer | |
58 | * @function: timer expiry callback function | |
59 | * @data: argument for the callback function | |
60 | * @base: pointer to the timer base (per cpu and per clock) | |
61 | * | |
62 | * The hrtimer structure must be initialized by init_hrtimer_#CLOCKTYPE() | |
63 | */ | |
64 | struct hrtimer { | |
65 | struct rb_node node; | |
66 | struct list_head list; | |
67 | ktime_t expires; | |
68 | enum hrtimer_state state; | |
69 | int (*function)(void *); | |
70 | void *data; | |
71 | struct hrtimer_base *base; | |
72 | }; | |
73 | ||
74 | /** | |
75 | * struct hrtimer_base - the timer base for a specific clock | |
76 | * | |
77 | * @index: clock type index for per_cpu support when moving a timer | |
78 | * to a base on another cpu. | |
79 | * @lock: lock protecting the base and associated timers | |
80 | * @active: red black tree root node for the active timers | |
81 | * @pending: list of pending timers for simple time ordered access | |
82 | * @resolution: the resolution of the clock, in nanoseconds | |
83 | * @get_time: function to retrieve the current time of the clock | |
84 | * @curr_timer: the timer which is executing a callback right now | |
85 | */ | |
86 | struct hrtimer_base { | |
87 | clockid_t index; | |
88 | spinlock_t lock; | |
89 | struct rb_root active; | |
90 | struct list_head pending; | |
91 | unsigned long resolution; | |
92 | ktime_t (*get_time)(void); | |
93 | struct hrtimer *curr_timer; | |
94 | }; | |
95 | ||
96 | /* Exported timer functions: */ | |
97 | ||
98 | /* Initialize timers: */ | |
99 | extern void hrtimer_init(struct hrtimer *timer, const clockid_t which_clock); | |
100 | extern void hrtimer_rebase(struct hrtimer *timer, const clockid_t which_clock); | |
101 | ||
102 | ||
103 | /* Basic timer operations: */ | |
104 | extern int hrtimer_start(struct hrtimer *timer, ktime_t tim, | |
105 | const enum hrtimer_mode mode); | |
106 | extern int hrtimer_cancel(struct hrtimer *timer); | |
107 | extern int hrtimer_try_to_cancel(struct hrtimer *timer); | |
108 | ||
109 | #define hrtimer_restart(timer) hrtimer_start((timer), (timer)->expires, HRTIMER_ABS) | |
110 | ||
111 | /* Query timers: */ | |
112 | extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer); | |
113 | extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp); | |
114 | ||
115 | static inline int hrtimer_active(const struct hrtimer *timer) | |
116 | { | |
117 | return timer->state == HRTIMER_PENDING; | |
118 | } | |
119 | ||
120 | /* Forward a hrtimer so it expires after now: */ | |
121 | extern unsigned long hrtimer_forward(struct hrtimer *timer, | |
122 | const ktime_t interval); | |
123 | ||
124 | /* Soft interrupt function to run the hrtimer queues: */ | |
125 | extern void hrtimer_run_queues(void); | |
126 | ||
127 | /* Bootup initialization: */ | |
128 | extern void __init hrtimers_init(void); | |
129 | ||
130 | #endif |