Linux kernel mirror (for testing)
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linux
1#ifndef _LINUX_TIMER_H
2#define _LINUX_TIMER_H
3
4#include <linux/list.h>
5#include <linux/ktime.h>
6#include <linux/stddef.h>
7#include <linux/debugobjects.h>
8#include <linux/stringify.h>
9
10struct tvec_base;
11
12struct timer_list {
13 struct list_head entry;
14 unsigned long expires;
15
16 void (*function)(unsigned long);
17 unsigned long data;
18
19 struct tvec_base *base;
20#ifdef CONFIG_TIMER_STATS
21 void *start_site;
22 char start_comm[16];
23 int start_pid;
24#endif
25#ifdef CONFIG_LOCKDEP
26 struct lockdep_map lockdep_map;
27#endif
28};
29
30extern struct tvec_base boot_tvec_bases;
31
32#ifdef CONFIG_LOCKDEP
33/*
34 * NB: because we have to copy the lockdep_map, setting the lockdep_map key
35 * (second argument) here is required, otherwise it could be initialised to
36 * the copy of the lockdep_map later! We use the pointer to and the string
37 * "<file>:<line>" as the key resp. the name of the lockdep_map.
38 */
39#define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn) \
40 .lockdep_map = STATIC_LOCKDEP_MAP_INIT(_kn, &_kn),
41#else
42#define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn)
43#endif
44
45#define TIMER_INITIALIZER(_function, _expires, _data) { \
46 .entry = { .prev = TIMER_ENTRY_STATIC }, \
47 .function = (_function), \
48 .expires = (_expires), \
49 .data = (_data), \
50 .base = &boot_tvec_bases, \
51 __TIMER_LOCKDEP_MAP_INITIALIZER( \
52 __FILE__ ":" __stringify(__LINE__)) \
53 }
54
55#define DEFINE_TIMER(_name, _function, _expires, _data) \
56 struct timer_list _name = \
57 TIMER_INITIALIZER(_function, _expires, _data)
58
59void init_timer_key(struct timer_list *timer,
60 const char *name,
61 struct lock_class_key *key);
62void init_timer_deferrable_key(struct timer_list *timer,
63 const char *name,
64 struct lock_class_key *key);
65
66#ifdef CONFIG_LOCKDEP
67#define init_timer(timer) \
68 do { \
69 static struct lock_class_key __key; \
70 init_timer_key((timer), #timer, &__key); \
71 } while (0)
72
73#define init_timer_deferrable(timer) \
74 do { \
75 static struct lock_class_key __key; \
76 init_timer_deferrable_key((timer), #timer, &__key); \
77 } while (0)
78
79#define init_timer_on_stack(timer) \
80 do { \
81 static struct lock_class_key __key; \
82 init_timer_on_stack_key((timer), #timer, &__key); \
83 } while (0)
84
85#define setup_timer(timer, fn, data) \
86 do { \
87 static struct lock_class_key __key; \
88 setup_timer_key((timer), #timer, &__key, (fn), (data));\
89 } while (0)
90
91#define setup_timer_on_stack(timer, fn, data) \
92 do { \
93 static struct lock_class_key __key; \
94 setup_timer_on_stack_key((timer), #timer, &__key, \
95 (fn), (data)); \
96 } while (0)
97#else
98#define init_timer(timer)\
99 init_timer_key((timer), NULL, NULL)
100#define init_timer_deferrable(timer)\
101 init_timer_deferrable_key((timer), NULL, NULL)
102#define init_timer_on_stack(timer)\
103 init_timer_on_stack_key((timer), NULL, NULL)
104#define setup_timer(timer, fn, data)\
105 setup_timer_key((timer), NULL, NULL, (fn), (data))
106#define setup_timer_on_stack(timer, fn, data)\
107 setup_timer_on_stack_key((timer), NULL, NULL, (fn), (data))
108#endif
109
110#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
111extern void init_timer_on_stack_key(struct timer_list *timer,
112 const char *name,
113 struct lock_class_key *key);
114extern void destroy_timer_on_stack(struct timer_list *timer);
115#else
116static inline void destroy_timer_on_stack(struct timer_list *timer) { }
117static inline void init_timer_on_stack_key(struct timer_list *timer,
118 const char *name,
119 struct lock_class_key *key)
120{
121 init_timer_key(timer, name, key);
122}
123#endif
124
125static inline void setup_timer_key(struct timer_list * timer,
126 const char *name,
127 struct lock_class_key *key,
128 void (*function)(unsigned long),
129 unsigned long data)
130{
131 timer->function = function;
132 timer->data = data;
133 init_timer_key(timer, name, key);
134}
135
136static inline void setup_timer_on_stack_key(struct timer_list *timer,
137 const char *name,
138 struct lock_class_key *key,
139 void (*function)(unsigned long),
140 unsigned long data)
141{
142 timer->function = function;
143 timer->data = data;
144 init_timer_on_stack_key(timer, name, key);
145}
146
147/**
148 * timer_pending - is a timer pending?
149 * @timer: the timer in question
150 *
151 * timer_pending will tell whether a given timer is currently pending,
152 * or not. Callers must ensure serialization wrt. other operations done
153 * to this timer, eg. interrupt contexts, or other CPUs on SMP.
154 *
155 * return value: 1 if the timer is pending, 0 if not.
156 */
157static inline int timer_pending(const struct timer_list * timer)
158{
159 return timer->entry.next != NULL;
160}
161
162extern void add_timer_on(struct timer_list *timer, int cpu);
163extern int del_timer(struct timer_list * timer);
164extern int mod_timer(struct timer_list *timer, unsigned long expires);
165extern int mod_timer_pending(struct timer_list *timer, unsigned long expires);
166extern int mod_timer_pinned(struct timer_list *timer, unsigned long expires);
167
168#define TIMER_NOT_PINNED 0
169#define TIMER_PINNED 1
170/*
171 * The jiffies value which is added to now, when there is no timer
172 * in the timer wheel:
173 */
174#define NEXT_TIMER_MAX_DELTA ((1UL << 30) - 1)
175
176/*
177 * Return when the next timer-wheel timeout occurs (in absolute jiffies),
178 * locks the timer base and does the comparison against the given
179 * jiffie.
180 */
181extern unsigned long get_next_timer_interrupt(unsigned long now);
182
183/*
184 * Timer-statistics info:
185 */
186#ifdef CONFIG_TIMER_STATS
187
188extern int timer_stats_active;
189
190#define TIMER_STATS_FLAG_DEFERRABLE 0x1
191
192extern void init_timer_stats(void);
193
194extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
195 void *timerf, char *comm,
196 unsigned int timer_flag);
197
198extern void __timer_stats_timer_set_start_info(struct timer_list *timer,
199 void *addr);
200
201static inline void timer_stats_timer_set_start_info(struct timer_list *timer)
202{
203 if (likely(!timer_stats_active))
204 return;
205 __timer_stats_timer_set_start_info(timer, __builtin_return_address(0));
206}
207
208static inline void timer_stats_timer_clear_start_info(struct timer_list *timer)
209{
210 timer->start_site = NULL;
211}
212#else
213static inline void init_timer_stats(void)
214{
215}
216
217static inline void timer_stats_timer_set_start_info(struct timer_list *timer)
218{
219}
220
221static inline void timer_stats_timer_clear_start_info(struct timer_list *timer)
222{
223}
224#endif
225
226extern void add_timer(struct timer_list *timer);
227
228#ifdef CONFIG_SMP
229 extern int try_to_del_timer_sync(struct timer_list *timer);
230 extern int del_timer_sync(struct timer_list *timer);
231#else
232# define try_to_del_timer_sync(t) del_timer(t)
233# define del_timer_sync(t) del_timer(t)
234#endif
235
236#define del_singleshot_timer_sync(t) del_timer_sync(t)
237
238extern void init_timers(void);
239extern void run_local_timers(void);
240struct hrtimer;
241extern enum hrtimer_restart it_real_fn(struct hrtimer *);
242
243unsigned long __round_jiffies(unsigned long j, int cpu);
244unsigned long __round_jiffies_relative(unsigned long j, int cpu);
245unsigned long round_jiffies(unsigned long j);
246unsigned long round_jiffies_relative(unsigned long j);
247
248unsigned long __round_jiffies_up(unsigned long j, int cpu);
249unsigned long __round_jiffies_up_relative(unsigned long j, int cpu);
250unsigned long round_jiffies_up(unsigned long j);
251unsigned long round_jiffies_up_relative(unsigned long j);
252
253#endif