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1da177e4 LT |
1 | #ifndef _LINUX_TIMER_H |
2 | #define _LINUX_TIMER_H | |
3 | ||
1da177e4 | 4 | #include <linux/list.h> |
82f67cd9 | 5 | #include <linux/ktime.h> |
1da177e4 | 6 | #include <linux/stddef.h> |
c6f3a97f | 7 | #include <linux/debugobjects.h> |
6f2b9b9a | 8 | #include <linux/stringify.h> |
1da177e4 | 9 | |
a6fa8e5a | 10 | struct tvec_base; |
1da177e4 LT |
11 | |
12 | struct timer_list { | |
13 | struct list_head entry; | |
14 | unsigned long expires; | |
15 | ||
1da177e4 LT |
16 | void (*function)(unsigned long); |
17 | unsigned long data; | |
18 | ||
a6fa8e5a | 19 | struct tvec_base *base; |
82f67cd9 IM |
20 | #ifdef CONFIG_TIMER_STATS |
21 | void *start_site; | |
22 | char start_comm[16]; | |
23 | int start_pid; | |
24 | #endif | |
6f2b9b9a JB |
25 | #ifdef CONFIG_LOCKDEP |
26 | struct lockdep_map lockdep_map; | |
27 | #endif | |
1da177e4 LT |
28 | }; |
29 | ||
a6fa8e5a | 30 | extern struct tvec_base boot_tvec_bases; |
55c888d6 | 31 | |
6f2b9b9a JB |
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 | ||
1da177e4 | 45 | #define TIMER_INITIALIZER(_function, _expires, _data) { \ |
c6f3a97f | 46 | .entry = { .prev = TIMER_ENTRY_STATIC }, \ |
1da177e4 LT |
47 | .function = (_function), \ |
48 | .expires = (_expires), \ | |
49 | .data = (_data), \ | |
3691c519 | 50 | .base = &boot_tvec_bases, \ |
6f2b9b9a JB |
51 | __TIMER_LOCKDEP_MAP_INITIALIZER( \ |
52 | __FILE__ ":" __stringify(__LINE__)) \ | |
1da177e4 LT |
53 | } |
54 | ||
8d06afab IM |
55 | #define DEFINE_TIMER(_name, _function, _expires, _data) \ |
56 | struct timer_list _name = \ | |
57 | TIMER_INITIALIZER(_function, _expires, _data) | |
58 | ||
6f2b9b9a JB |
59 | void init_timer_key(struct timer_list *timer, |
60 | const char *name, | |
61 | struct lock_class_key *key); | |
62 | void 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 | |
1da177e4 | 109 | |
c6f3a97f | 110 | #ifdef CONFIG_DEBUG_OBJECTS_TIMERS |
6f2b9b9a JB |
111 | extern void init_timer_on_stack_key(struct timer_list *timer, |
112 | const char *name, | |
113 | struct lock_class_key *key); | |
c6f3a97f TG |
114 | extern void destroy_timer_on_stack(struct timer_list *timer); |
115 | #else | |
116 | static inline void destroy_timer_on_stack(struct timer_list *timer) { } | |
6f2b9b9a JB |
117 | static inline void init_timer_on_stack_key(struct timer_list *timer, |
118 | const char *name, | |
119 | struct lock_class_key *key) | |
c6f3a97f | 120 | { |
6f2b9b9a | 121 | init_timer_key(timer, name, key); |
c6f3a97f TG |
122 | } |
123 | #endif | |
124 | ||
6f2b9b9a JB |
125 | static inline void setup_timer_key(struct timer_list * timer, |
126 | const char *name, | |
127 | struct lock_class_key *key, | |
a8db2db1 ON |
128 | void (*function)(unsigned long), |
129 | unsigned long data) | |
130 | { | |
131 | timer->function = function; | |
132 | timer->data = data; | |
6f2b9b9a | 133 | init_timer_key(timer, name, key); |
a8db2db1 ON |
134 | } |
135 | ||
6f2b9b9a JB |
136 | static inline void setup_timer_on_stack_key(struct timer_list *timer, |
137 | const char *name, | |
138 | struct lock_class_key *key, | |
c6f3a97f TG |
139 | void (*function)(unsigned long), |
140 | unsigned long data) | |
141 | { | |
142 | timer->function = function; | |
143 | timer->data = data; | |
6f2b9b9a | 144 | init_timer_on_stack_key(timer, name, key); |
c6f3a97f TG |
145 | } |
146 | ||
45f8bde0 | 147 | /** |
1da177e4 LT |
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 | */ | |
157 | static inline int timer_pending(const struct timer_list * timer) | |
158 | { | |
55c888d6 | 159 | return timer->entry.next != NULL; |
1da177e4 LT |
160 | } |
161 | ||
162 | extern void add_timer_on(struct timer_list *timer, int cpu); | |
163 | extern int del_timer(struct timer_list * timer); | |
1da177e4 | 164 | extern int mod_timer(struct timer_list *timer, unsigned long expires); |
74019224 | 165 | extern int mod_timer_pending(struct timer_list *timer, unsigned long expires); |
597d0275 | 166 | extern int mod_timer_pinned(struct timer_list *timer, unsigned long expires); |
1da177e4 | 167 | |
597d0275 AB |
168 | #define TIMER_NOT_PINNED 0 |
169 | #define TIMER_PINNED 1 | |
eaad084b TG |
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 | ||
fd064b9b TG |
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 | */ | |
181 | extern unsigned long get_next_timer_interrupt(unsigned long now); | |
1da177e4 | 182 | |
82f67cd9 IM |
183 | /* |
184 | * Timer-statistics info: | |
185 | */ | |
186 | #ifdef CONFIG_TIMER_STATS | |
187 | ||
507e1231 HC |
188 | extern int timer_stats_active; |
189 | ||
c5c061b8 VP |
190 | #define TIMER_STATS_FLAG_DEFERRABLE 0x1 |
191 | ||
82f67cd9 IM |
192 | extern void init_timer_stats(void); |
193 | ||
194 | extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf, | |
c5c061b8 VP |
195 | void *timerf, char *comm, |
196 | unsigned int timer_flag); | |
82f67cd9 IM |
197 | |
198 | extern void __timer_stats_timer_set_start_info(struct timer_list *timer, | |
199 | void *addr); | |
200 | ||
201 | static inline void timer_stats_timer_set_start_info(struct timer_list *timer) | |
202 | { | |
507e1231 HC |
203 | if (likely(!timer_stats_active)) |
204 | return; | |
82f67cd9 IM |
205 | __timer_stats_timer_set_start_info(timer, __builtin_return_address(0)); |
206 | } | |
207 | ||
208 | static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) | |
209 | { | |
210 | timer->start_site = NULL; | |
211 | } | |
212 | #else | |
213 | static inline void init_timer_stats(void) | |
214 | { | |
215 | } | |
216 | ||
82f67cd9 IM |
217 | static inline void timer_stats_timer_set_start_info(struct timer_list *timer) |
218 | { | |
219 | } | |
220 | ||
221 | static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) | |
222 | { | |
223 | } | |
224 | #endif | |
225 | ||
74019224 | 226 | extern void add_timer(struct timer_list *timer); |
1da177e4 LT |
227 | |
228 | #ifdef CONFIG_SMP | |
fd450b73 | 229 | extern int try_to_del_timer_sync(struct timer_list *timer); |
1da177e4 | 230 | extern int del_timer_sync(struct timer_list *timer); |
1da177e4 | 231 | #else |
fd450b73 ON |
232 | # define try_to_del_timer_sync(t) del_timer(t) |
233 | # define del_timer_sync(t) del_timer(t) | |
1da177e4 LT |
234 | #endif |
235 | ||
55c888d6 ON |
236 | #define del_singleshot_timer_sync(t) del_timer_sync(t) |
237 | ||
1da177e4 LT |
238 | extern void init_timers(void); |
239 | extern void run_local_timers(void); | |
05cfb614 | 240 | struct hrtimer; |
c9cb2e3d | 241 | extern enum hrtimer_restart it_real_fn(struct hrtimer *); |
1da177e4 | 242 | |
4c36a5de AV |
243 | unsigned long __round_jiffies(unsigned long j, int cpu); |
244 | unsigned long __round_jiffies_relative(unsigned long j, int cpu); | |
245 | unsigned long round_jiffies(unsigned long j); | |
246 | unsigned long round_jiffies_relative(unsigned long j); | |
247 | ||
9c133c46 AS |
248 | unsigned long __round_jiffies_up(unsigned long j, int cpu); |
249 | unsigned long __round_jiffies_up_relative(unsigned long j, int cpu); | |
250 | unsigned long round_jiffies_up(unsigned long j); | |
251 | unsigned long round_jiffies_up_relative(unsigned long j); | |
252 | ||
1da177e4 | 253 | #endif |