1 #ifndef _LINUX_TIMER_H 2 #define _LINUX_TIMER_H 3 4 #include <linux/list.h> 5 #include <linux/ktime.h> 6 #include <linux/spinlock.h> 7 #include <linux/stddef.h> 8 9 struct tvec_t_base_s; 10 11 struct timer_list { 12 struct list_head entry; 13 unsigned long expires; 14 15 void (*function)(unsigned long); 16 unsigned long data; 17 18 struct tvec_t_base_s *base; 19 #ifdef CONFIG_TIMER_STATS 20 void *start_site; 21 char start_comm[16]; 22 int start_pid; 23 #endif 24 }; 25 26 extern struct tvec_t_base_s boot_tvec_bases; 27 28 #define TIMER_INITIALIZER(_function, _expires, _data) { \ 29 .function = (_function), \ 30 .expires = (_expires), \ 31 .data = (_data), \ 32 .base = &boot_tvec_bases, \ 33 } 34 35 #define DEFINE_TIMER(_name, _function, _expires, _data) \ 36 struct timer_list _name = \ 37 TIMER_INITIALIZER(_function, _expires, _data) 38 39 void fastcall init_timer(struct timer_list * timer); 40 void fastcall init_timer_deferrable(struct timer_list *timer); 41 42 static inline void setup_timer(struct timer_list * timer, 43 void (*function)(unsigned long), 44 unsigned long data) 45 { 46 timer->function = function; 47 timer->data = data; 48 init_timer(timer); 49 } 50 51 /** 52 * timer_pending - is a timer pending? 53 * @timer: the timer in question 54 * 55 * timer_pending will tell whether a given timer is currently pending, 56 * or not. Callers must ensure serialization wrt. other operations done 57 * to this timer, eg. interrupt contexts, or other CPUs on SMP. 58 * 59 * return value: 1 if the timer is pending, 0 if not. 60 */ 61 static inline int timer_pending(const struct timer_list * timer) 62 { 63 return timer->entry.next != NULL; 64 } 65 66 extern void add_timer_on(struct timer_list *timer, int cpu); 67 extern int del_timer(struct timer_list * timer); 68 extern int __mod_timer(struct timer_list *timer, unsigned long expires); 69 extern int mod_timer(struct timer_list *timer, unsigned long expires); 70 71 /* 72 * The jiffies value which is added to now, when there is no timer 73 * in the timer wheel: 74 */ 75 #define NEXT_TIMER_MAX_DELTA ((1UL << 30) - 1) 76 77 /* 78 * Return when the next timer-wheel timeout occurs (in absolute jiffies), 79 * locks the timer base: 80 */ 81 extern unsigned long next_timer_interrupt(void); 82 /* 83 * Return when the next timer-wheel timeout occurs (in absolute jiffies), 84 * locks the timer base and does the comparison against the given 85 * jiffie. 86 */ 87 extern unsigned long get_next_timer_interrupt(unsigned long now); 88 89 /* 90 * Timer-statistics info: 91 */ 92 #ifdef CONFIG_TIMER_STATS 93 94 extern void init_timer_stats(void); 95 96 extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf, 97 void *timerf, char * comm); 98 99 static inline void timer_stats_account_timer(struct timer_list *timer) 100 { 101 timer_stats_update_stats(timer, timer->start_pid, timer->start_site, 102 timer->function, timer->start_comm); 103 } 104 105 extern void __timer_stats_timer_set_start_info(struct timer_list *timer, 106 void *addr); 107 108 static inline void timer_stats_timer_set_start_info(struct timer_list *timer) 109 { 110 __timer_stats_timer_set_start_info(timer, __builtin_return_address(0)); 111 } 112 113 static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) 114 { 115 timer->start_site = NULL; 116 } 117 #else 118 static inline void init_timer_stats(void) 119 { 120 } 121 122 static inline void timer_stats_account_timer(struct timer_list *timer) 123 { 124 } 125 126 static inline void timer_stats_timer_set_start_info(struct timer_list *timer) 127 { 128 } 129 130 static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) 131 { 132 } 133 #endif 134 135 extern void delayed_work_timer_fn(unsigned long __data); 136 137 /** 138 * add_timer - start a timer 139 * @timer: the timer to be added 140 * 141 * The kernel will do a ->function(->data) callback from the 142 * timer interrupt at the ->expires point in the future. The 143 * current time is 'jiffies'. 144 * 145 * The timer's ->expires, ->function (and if the handler uses it, ->data) 146 * fields must be set prior calling this function. 147 * 148 * Timers with an ->expires field in the past will be executed in the next 149 * timer tick. 150 */ 151 static inline void add_timer(struct timer_list *timer) 152 { 153 BUG_ON(timer_pending(timer)); 154 __mod_timer(timer, timer->expires); 155 } 156 157 #ifdef CONFIG_SMP 158 extern int try_to_del_timer_sync(struct timer_list *timer); 159 extern int del_timer_sync(struct timer_list *timer); 160 #else 161 # define try_to_del_timer_sync(t) del_timer(t) 162 # define del_timer_sync(t) del_timer(t) 163 #endif 164 165 #define del_singleshot_timer_sync(t) del_timer_sync(t) 166 167 extern void init_timers(void); 168 extern void run_local_timers(void); 169 struct hrtimer; 170 extern enum hrtimer_restart it_real_fn(struct hrtimer *); 171 172 unsigned long __round_jiffies(unsigned long j, int cpu); 173 unsigned long __round_jiffies_relative(unsigned long j, int cpu); 174 unsigned long round_jiffies(unsigned long j); 175 unsigned long round_jiffies_relative(unsigned long j); 176 177 178 #endif 179