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 8 struct tvec_t_base_s; 9 10 struct timer_list { 11 struct list_head entry; 12 unsigned long expires; 13 14 void (*function)(unsigned long); 15 unsigned long data; 16 17 struct tvec_t_base_s *base; 18 #ifdef CONFIG_TIMER_STATS 19 void *start_site; 20 char start_comm[16]; 21 int start_pid; 22 #endif 23 }; 24 25 extern struct tvec_t_base_s boot_tvec_bases; 26 27 #define TIMER_INITIALIZER(_function, _expires, _data) { \ 28 .function = (_function), \ 29 .expires = (_expires), \ 30 .data = (_data), \ 31 .base = &boot_tvec_bases, \ 32 } 33 34 #define DEFINE_TIMER(_name, _function, _expires, _data) \ 35 struct timer_list _name = \ 36 TIMER_INITIALIZER(_function, _expires, _data) 37 38 void fastcall init_timer(struct timer_list * timer); 39 void fastcall init_timer_deferrable(struct timer_list *timer); 40 41 static inline void setup_timer(struct timer_list * timer, 42 void (*function)(unsigned long), 43 unsigned long data) 44 { 45 timer->function = function; 46 timer->data = data; 47 init_timer(timer); 48 } 49 50 /** 51 * timer_pending - is a timer pending? 52 * @timer: the timer in question 53 * 54 * timer_pending will tell whether a given timer is currently pending, 55 * or not. Callers must ensure serialization wrt. other operations done 56 * to this timer, eg. interrupt contexts, or other CPUs on SMP. 57 * 58 * return value: 1 if the timer is pending, 0 if not. 59 */ 60 static inline int timer_pending(const struct timer_list * timer) 61 { 62 return timer->entry.next != NULL; 63 } 64 65 extern void add_timer_on(struct timer_list *timer, int cpu); 66 extern int del_timer(struct timer_list * timer); 67 extern int __mod_timer(struct timer_list *timer, unsigned long expires); 68 extern int mod_timer(struct timer_list *timer, unsigned long expires); 69 70 /* 71 * The jiffies value which is added to now, when there is no timer 72 * in the timer wheel: 73 */ 74 #define NEXT_TIMER_MAX_DELTA ((1UL << 30) - 1) 75 76 /* 77 * Return when the next timer-wheel timeout occurs (in absolute jiffies), 78 * locks the timer base: 79 */ 80 extern unsigned long next_timer_interrupt(void); 81 /* 82 * Return when the next timer-wheel timeout occurs (in absolute jiffies), 83 * locks the timer base and does the comparison against the given 84 * jiffie. 85 */ 86 extern unsigned long get_next_timer_interrupt(unsigned long now); 87 88 /* 89 * Timer-statistics info: 90 */ 91 #ifdef CONFIG_TIMER_STATS 92 93 #define TIMER_STATS_FLAG_DEFERRABLE 0x1 94 95 extern void init_timer_stats(void); 96 97 extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf, 98 void *timerf, char *comm, 99 unsigned int timer_flag); 100 101 extern void __timer_stats_timer_set_start_info(struct timer_list *timer, 102 void *addr); 103 104 static inline void timer_stats_timer_set_start_info(struct timer_list *timer) 105 { 106 __timer_stats_timer_set_start_info(timer, __builtin_return_address(0)); 107 } 108 109 static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) 110 { 111 timer->start_site = NULL; 112 } 113 #else 114 static inline void init_timer_stats(void) 115 { 116 } 117 118 static inline void timer_stats_timer_set_start_info(struct timer_list *timer) 119 { 120 } 121 122 static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) 123 { 124 } 125 #endif 126 127 extern void delayed_work_timer_fn(unsigned long __data); 128 129 /** 130 * add_timer - start a timer 131 * @timer: the timer to be added 132 * 133 * The kernel will do a ->function(->data) callback from the 134 * timer interrupt at the ->expires point in the future. The 135 * current time is 'jiffies'. 136 * 137 * The timer's ->expires, ->function (and if the handler uses it, ->data) 138 * fields must be set prior calling this function. 139 * 140 * Timers with an ->expires field in the past will be executed in the next 141 * timer tick. 142 */ 143 static inline void add_timer(struct timer_list *timer) 144 { 145 BUG_ON(timer_pending(timer)); 146 __mod_timer(timer, timer->expires); 147 } 148 149 #ifdef CONFIG_SMP 150 extern int try_to_del_timer_sync(struct timer_list *timer); 151 extern int del_timer_sync(struct timer_list *timer); 152 #else 153 # define try_to_del_timer_sync(t) del_timer(t) 154 # define del_timer_sync(t) del_timer(t) 155 #endif 156 157 #define del_singleshot_timer_sync(t) del_timer_sync(t) 158 159 extern void init_timers(void); 160 extern void run_local_timers(void); 161 struct hrtimer; 162 extern enum hrtimer_restart it_real_fn(struct hrtimer *); 163 164 unsigned long __round_jiffies(unsigned long j, int cpu); 165 unsigned long __round_jiffies_relative(unsigned long j, int cpu); 166 unsigned long round_jiffies(unsigned long j); 167 unsigned long round_jiffies_relative(unsigned long j); 168 169 170 #endif 171