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>
14 * All fields that change during normal runtime grouped to the
17 struct list_head entry;
18 unsigned long expires;
19 struct tvec_base *base;
21 void (*function)(unsigned long);
26 #ifdef CONFIG_TIMER_STATS
32 struct lockdep_map lockdep_map;
36 extern struct tvec_base boot_tvec_bases;
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.
45 #define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn) \
46 .lockdep_map = STATIC_LOCKDEP_MAP_INIT(_kn, &_kn),
48 #define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn)
52 * Note that all tvec_bases are 2 byte aligned and lower bit of
53 * base in timer_list is guaranteed to be zero. Use the LSB to
54 * indicate whether the timer is deferrable.
56 * A deferrable timer will work normally when the system is busy, but
57 * will not cause a CPU to come out of idle just to service it; instead,
58 * the timer will be serviced when the CPU eventually wakes up with a
59 * subsequent non-deferrable timer.
61 #define TBASE_DEFERRABLE_FLAG (0x1)
63 #define TIMER_INITIALIZER(_function, _expires, _data) { \
64 .entry = { .prev = TIMER_ENTRY_STATIC }, \
65 .function = (_function), \
66 .expires = (_expires), \
68 .base = &boot_tvec_bases, \
70 __TIMER_LOCKDEP_MAP_INITIALIZER( \
71 __FILE__ ":" __stringify(__LINE__)) \
74 #define TBASE_MAKE_DEFERRED(ptr) ((struct tvec_base *) \
75 ((unsigned char *)(ptr) + TBASE_DEFERRABLE_FLAG))
77 #define TIMER_DEFERRED_INITIALIZER(_function, _expires, _data) {\
78 .entry = { .prev = TIMER_ENTRY_STATIC }, \
79 .function = (_function), \
80 .expires = (_expires), \
82 .base = TBASE_MAKE_DEFERRED(&boot_tvec_bases), \
83 __TIMER_LOCKDEP_MAP_INITIALIZER( \
84 __FILE__ ":" __stringify(__LINE__)) \
87 #define DEFINE_TIMER(_name, _function, _expires, _data) \
88 struct timer_list _name = \
89 TIMER_INITIALIZER(_function, _expires, _data)
91 void init_timer_key(struct timer_list *timer,
93 struct lock_class_key *key);
94 void init_timer_deferrable_key(struct timer_list *timer,
96 struct lock_class_key *key);
99 #define init_timer(timer) \
101 static struct lock_class_key __key; \
102 init_timer_key((timer), #timer, &__key); \
105 #define init_timer_deferrable(timer) \
107 static struct lock_class_key __key; \
108 init_timer_deferrable_key((timer), #timer, &__key); \
111 #define init_timer_on_stack(timer) \
113 static struct lock_class_key __key; \
114 init_timer_on_stack_key((timer), #timer, &__key); \
117 #define setup_timer(timer, fn, data) \
119 static struct lock_class_key __key; \
120 setup_timer_key((timer), #timer, &__key, (fn), (data));\
123 #define setup_timer_on_stack(timer, fn, data) \
125 static struct lock_class_key __key; \
126 setup_timer_on_stack_key((timer), #timer, &__key, \
129 #define setup_deferrable_timer_on_stack(timer, fn, data) \
131 static struct lock_class_key __key; \
132 setup_deferrable_timer_on_stack_key((timer), #timer, \
137 #define init_timer(timer)\
138 init_timer_key((timer), NULL, NULL)
139 #define init_timer_deferrable(timer)\
140 init_timer_deferrable_key((timer), NULL, NULL)
141 #define init_timer_on_stack(timer)\
142 init_timer_on_stack_key((timer), NULL, NULL)
143 #define setup_timer(timer, fn, data)\
144 setup_timer_key((timer), NULL, NULL, (fn), (data))
145 #define setup_timer_on_stack(timer, fn, data)\
146 setup_timer_on_stack_key((timer), NULL, NULL, (fn), (data))
147 #define setup_deferrable_timer_on_stack(timer, fn, data)\
148 setup_deferrable_timer_on_stack_key((timer), NULL, NULL, (fn), (data))
151 #ifdef CONFIG_DEBUG_OBJECTS_TIMERS
152 extern void init_timer_on_stack_key(struct timer_list *timer,
154 struct lock_class_key *key);
155 extern void destroy_timer_on_stack(struct timer_list *timer);
157 static inline void destroy_timer_on_stack(struct timer_list *timer) { }
158 static inline void init_timer_on_stack_key(struct timer_list *timer,
160 struct lock_class_key *key)
162 init_timer_key(timer, name, key);
166 static inline void setup_timer_key(struct timer_list * timer,
168 struct lock_class_key *key,
169 void (*function)(unsigned long),
172 timer->function = function;
174 init_timer_key(timer, name, key);
177 static inline void setup_timer_on_stack_key(struct timer_list *timer,
179 struct lock_class_key *key,
180 void (*function)(unsigned long),
183 timer->function = function;
185 init_timer_on_stack_key(timer, name, key);
188 extern void setup_deferrable_timer_on_stack_key(struct timer_list *timer,
190 struct lock_class_key *key,
191 void (*function)(unsigned long),
195 * timer_pending - is a timer pending?
196 * @timer: the timer in question
198 * timer_pending will tell whether a given timer is currently pending,
199 * or not. Callers must ensure serialization wrt. other operations done
200 * to this timer, eg. interrupt contexts, or other CPUs on SMP.
202 * return value: 1 if the timer is pending, 0 if not.
204 static inline int timer_pending(const struct timer_list * timer)
206 return timer->entry.next != NULL;
209 extern void add_timer_on(struct timer_list *timer, int cpu);
210 extern int del_timer(struct timer_list * timer);
211 extern int mod_timer(struct timer_list *timer, unsigned long expires);
212 extern int mod_timer_pending(struct timer_list *timer, unsigned long expires);
213 extern int mod_timer_pinned(struct timer_list *timer, unsigned long expires);
215 extern void set_timer_slack(struct timer_list *time, int slack_hz);
217 #define TIMER_NOT_PINNED 0
218 #define TIMER_PINNED 1
220 * The jiffies value which is added to now, when there is no timer
221 * in the timer wheel:
223 #define NEXT_TIMER_MAX_DELTA ((1UL << 30) - 1)
226 * Return when the next timer-wheel timeout occurs (in absolute jiffies),
227 * locks the timer base and does the comparison against the given
230 extern unsigned long get_next_timer_interrupt(unsigned long now);
233 * Timer-statistics info:
235 #ifdef CONFIG_TIMER_STATS
237 extern int timer_stats_active;
239 #define TIMER_STATS_FLAG_DEFERRABLE 0x1
241 extern void init_timer_stats(void);
243 extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
244 void *timerf, char *comm,
245 unsigned int timer_flag);
247 extern void __timer_stats_timer_set_start_info(struct timer_list *timer,
250 static inline void timer_stats_timer_set_start_info(struct timer_list *timer)
252 if (likely(!timer_stats_active))
254 __timer_stats_timer_set_start_info(timer, __builtin_return_address(0));
257 static inline void timer_stats_timer_clear_start_info(struct timer_list *timer)
259 timer->start_site = NULL;
262 static inline void init_timer_stats(void)
266 static inline void timer_stats_timer_set_start_info(struct timer_list *timer)
270 static inline void timer_stats_timer_clear_start_info(struct timer_list *timer)
275 extern void add_timer(struct timer_list *timer);
277 extern int try_to_del_timer_sync(struct timer_list *timer);
280 extern int del_timer_sync(struct timer_list *timer);
282 # define del_timer_sync(t) del_timer(t)
285 #define del_singleshot_timer_sync(t) del_timer_sync(t)
287 extern void init_timers(void);
288 extern void run_local_timers(void);
290 extern enum hrtimer_restart it_real_fn(struct hrtimer *);
292 unsigned long __round_jiffies(unsigned long j, int cpu);
293 unsigned long __round_jiffies_relative(unsigned long j, int cpu);
294 unsigned long round_jiffies(unsigned long j);
295 unsigned long round_jiffies_relative(unsigned long j);
297 unsigned long __round_jiffies_up(unsigned long j, int cpu);
298 unsigned long __round_jiffies_up_relative(unsigned long j, int cpu);
299 unsigned long round_jiffies_up(unsigned long j);
300 unsigned long round_jiffies_up_relative(unsigned long j);