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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 | |
10 | struct tvec_base; |
11 | |
12 | struct timer_list { |
13 | /* |
14 | * All fields that change during normal runtime grouped to the |
15 | * same cacheline |
16 | */ |
17 | struct list_head entry; |
18 | unsigned long expires; |
19 | struct tvec_base *base; |
20 | |
21 | void (*function)(unsigned long); |
22 | unsigned long data; |
23 | |
24 | int slack; |
25 | |
26 | #ifdef CONFIG_TIMER_STATS |
27 | int start_pid; |
28 | void *start_site; |
29 | char start_comm[16]; |
30 | #endif |
31 | #ifdef CONFIG_LOCKDEP |
32 | struct lockdep_map lockdep_map; |
33 | #endif |
34 | }; |
35 | |
36 | extern struct tvec_base boot_tvec_bases; |
37 | |
38 | #ifdef CONFIG_LOCKDEP |
39 | /* |
40 | * NB: because we have to copy the lockdep_map, setting the lockdep_map key |
41 | * (second argument) here is required, otherwise it could be initialised to |
42 | * the copy of the lockdep_map later! We use the pointer to and the string |
43 | * "<file>:<line>" as the key resp. the name of the lockdep_map. |
44 | */ |
45 | #define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn) \ |
46 | .lockdep_map = STATIC_LOCKDEP_MAP_INIT(_kn, &_kn), |
47 | #else |
48 | #define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn) |
49 | #endif |
50 | |
51 | /* |
52 | * Note that all tvec_bases are at least 4 byte aligned and lower two bits |
53 | * of base in timer_list is guaranteed to be zero. Use them for flags. |
54 | * |
55 | * A deferrable timer will work normally when the system is busy, but |
56 | * will not cause a CPU to come out of idle just to service it; instead, |
57 | * the timer will be serviced when the CPU eventually wakes up with a |
58 | * subsequent non-deferrable timer. |
59 | * |
60 | * An irqsafe timer is executed with IRQ disabled and it's safe to wait for |
61 | * the completion of the running instance from IRQ handlers, for example, |
62 | * by calling del_timer_sync(). |
63 | * |
64 | * Note: The irq disabled callback execution is a special case for |
65 | * workqueue locking issues. It's not meant for executing random crap |
66 | * with interrupts disabled. Abuse is monitored! |
67 | */ |
68 | #define TIMER_DEFERRABLE 0x1LU |
69 | #define TIMER_IRQSAFE 0x2LU |
70 | |
71 | #define TIMER_FLAG_MASK 0x3LU |
72 | |
73 | #define __TIMER_INITIALIZER(_function, _expires, _data, _flags) { \ |
74 | .entry = { .prev = TIMER_ENTRY_STATIC }, \ |
75 | .function = (_function), \ |
76 | .expires = (_expires), \ |
77 | .data = (_data), \ |
78 | .base = (void *)((unsigned long)&boot_tvec_bases + (_flags)), \ |
79 | .slack = -1, \ |
80 | __TIMER_LOCKDEP_MAP_INITIALIZER( \ |
81 | __FILE__ ":" __stringify(__LINE__)) \ |
82 | } |
83 | |
84 | #define TIMER_INITIALIZER(_function, _expires, _data) \ |
85 | __TIMER_INITIALIZER((_function), (_expires), (_data), 0) |
86 | |
87 | #define TIMER_DEFERRED_INITIALIZER(_function, _expires, _data) \ |
88 | __TIMER_INITIALIZER((_function), (_expires), (_data), TIMER_DEFERRABLE) |
89 | |
90 | #define DEFINE_TIMER(_name, _function, _expires, _data) \ |
91 | struct timer_list _name = \ |
92 | TIMER_INITIALIZER(_function, _expires, _data) |
93 | |
94 | void init_timer_key(struct timer_list *timer, unsigned int flags, |
95 | const char *name, struct lock_class_key *key); |
96 | |
97 | #ifdef CONFIG_DEBUG_OBJECTS_TIMERS |
98 | extern void init_timer_on_stack_key(struct timer_list *timer, |
99 | unsigned int flags, const char *name, |
100 | struct lock_class_key *key); |
101 | extern void destroy_timer_on_stack(struct timer_list *timer); |
102 | #else |
103 | static inline void destroy_timer_on_stack(struct timer_list *timer) { } |
104 | static inline void init_timer_on_stack_key(struct timer_list *timer, |
105 | unsigned int flags, const char *name, |
106 | struct lock_class_key *key) |
107 | { |
108 | init_timer_key(timer, flags, name, key); |
109 | } |
110 | #endif |
111 | |
112 | #ifdef CONFIG_LOCKDEP |
113 | #define __init_timer(_timer, _flags) \ |
114 | do { \ |
115 | static struct lock_class_key __key; \ |
116 | init_timer_key((_timer), (_flags), #_timer, &__key); \ |
117 | } while (0) |
118 | |
119 | #define __init_timer_on_stack(_timer, _flags) \ |
120 | do { \ |
121 | static struct lock_class_key __key; \ |
122 | init_timer_on_stack_key((_timer), (_flags), #_timer, &__key); \ |
123 | } while (0) |
124 | #else |
125 | #define __init_timer(_timer, _flags) \ |
126 | init_timer_key((_timer), (_flags), NULL, NULL) |
127 | #define __init_timer_on_stack(_timer, _flags) \ |
128 | init_timer_on_stack_key((_timer), (_flags), NULL, NULL) |
129 | #endif |
130 | |
131 | #define init_timer(timer) \ |
132 | __init_timer((timer), 0) |
133 | #define init_timer_deferrable(timer) \ |
134 | __init_timer((timer), TIMER_DEFERRABLE) |
135 | #define init_timer_on_stack(timer) \ |
136 | __init_timer_on_stack((timer), 0) |
137 | |
138 | #define __setup_timer(_timer, _fn, _data, _flags) \ |
139 | do { \ |
140 | __init_timer((_timer), (_flags)); \ |
141 | (_timer)->function = (_fn); \ |
142 | (_timer)->data = (_data); \ |
143 | } while (0) |
144 | |
145 | #define __setup_timer_on_stack(_timer, _fn, _data, _flags) \ |
146 | do { \ |
147 | __init_timer_on_stack((_timer), (_flags)); \ |
148 | (_timer)->function = (_fn); \ |
149 | (_timer)->data = (_data); \ |
150 | } while (0) |
151 | |
152 | #define setup_timer(timer, fn, data) \ |
153 | __setup_timer((timer), (fn), (data), 0) |
154 | #define setup_timer_on_stack(timer, fn, data) \ |
155 | __setup_timer_on_stack((timer), (fn), (data), 0) |
156 | #define setup_deferrable_timer_on_stack(timer, fn, data) \ |
157 | __setup_timer_on_stack((timer), (fn), (data), TIMER_DEFERRABLE) |
158 | |
159 | /** |
160 | * timer_pending - is a timer pending? |
161 | * @timer: the timer in question |
162 | * |
163 | * timer_pending will tell whether a given timer is currently pending, |
164 | * or not. Callers must ensure serialization wrt. other operations done |
165 | * to this timer, eg. interrupt contexts, or other CPUs on SMP. |
166 | * |
167 | * return value: 1 if the timer is pending, 0 if not. |
168 | */ |
169 | static inline int timer_pending(const struct timer_list * timer) |
170 | { |
171 | return timer->entry.next != NULL; |
172 | } |
173 | |
174 | extern void add_timer_on(struct timer_list *timer, int cpu); |
175 | extern int del_timer(struct timer_list * timer); |
176 | extern int mod_timer(struct timer_list *timer, unsigned long expires); |
177 | extern int mod_timer_pending(struct timer_list *timer, unsigned long expires); |
178 | extern int mod_timer_pinned(struct timer_list *timer, unsigned long expires); |
179 | |
180 | extern void set_timer_slack(struct timer_list *time, int slack_hz); |
181 | |
182 | #define TIMER_NOT_PINNED 0 |
183 | #define TIMER_PINNED 1 |
184 | /* |
185 | * The jiffies value which is added to now, when there is no timer |
186 | * in the timer wheel: |
187 | */ |
188 | #define NEXT_TIMER_MAX_DELTA ((1UL << 30) - 1) |
189 | |
190 | /* |
191 | * Return when the next timer-wheel timeout occurs (in absolute jiffies), |
192 | * locks the timer base and does the comparison against the given |
193 | * jiffie. |
194 | */ |
195 | extern unsigned long get_next_timer_interrupt(unsigned long now); |
196 | |
197 | /* |
198 | * Timer-statistics info: |
199 | */ |
200 | #ifdef CONFIG_TIMER_STATS |
201 | |
202 | extern int timer_stats_active; |
203 | |
204 | #define TIMER_STATS_FLAG_DEFERRABLE 0x1 |
205 | |
206 | extern void init_timer_stats(void); |
207 | |
208 | extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf, |
209 | void *timerf, char *comm, |
210 | unsigned int timer_flag); |
211 | |
212 | extern void __timer_stats_timer_set_start_info(struct timer_list *timer, |
213 | void *addr); |
214 | |
215 | static inline void timer_stats_timer_set_start_info(struct timer_list *timer) |
216 | { |
217 | if (likely(!timer_stats_active)) |
218 | return; |
219 | __timer_stats_timer_set_start_info(timer, __builtin_return_address(0)); |
220 | } |
221 | |
222 | static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) |
223 | { |
224 | timer->start_site = NULL; |
225 | } |
226 | #else |
227 | static inline void init_timer_stats(void) |
228 | { |
229 | } |
230 | |
231 | static inline void timer_stats_timer_set_start_info(struct timer_list *timer) |
232 | { |
233 | } |
234 | |
235 | static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) |
236 | { |
237 | } |
238 | #endif |
239 | |
240 | extern void add_timer(struct timer_list *timer); |
241 | |
242 | extern int try_to_del_timer_sync(struct timer_list *timer); |
243 | |
244 | #ifdef CONFIG_SMP |
245 | extern int del_timer_sync(struct timer_list *timer); |
246 | #else |
247 | # define del_timer_sync(t) del_timer(t) |
248 | #endif |
249 | |
250 | #define del_singleshot_timer_sync(t) del_timer_sync(t) |
251 | |
252 | extern void init_timers(void); |
253 | extern void run_local_timers(void); |
254 | struct hrtimer; |
255 | extern enum hrtimer_restart it_real_fn(struct hrtimer *); |
256 | |
257 | unsigned long __round_jiffies(unsigned long j, int cpu); |
258 | unsigned long __round_jiffies_relative(unsigned long j, int cpu); |
259 | unsigned long round_jiffies(unsigned long j); |
260 | unsigned long round_jiffies_relative(unsigned long j); |
261 | |
262 | unsigned long __round_jiffies_up(unsigned long j, int cpu); |
263 | unsigned long __round_jiffies_up_relative(unsigned long j, int cpu); |
264 | unsigned long round_jiffies_up(unsigned long j); |
265 | unsigned long round_jiffies_up_relative(unsigned long j); |
266 | |
267 | #endif |
268 |
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