#ifndef _LINUX_TIMER_H #define _LINUX_TIMER_H #include <linux/list.h> #include <linux/ktime.h> #include <linux/stddef.h> #include <linux/debugobjects.h> #include <linux/stringify.h> struct tvec_base; struct timer_list { /* * All fields that change during normal runtime grouped to the * same cacheline */ struct list_head entry; unsigned long expires; struct tvec_base *base; void (*function)(unsigned long); unsigned long data; int slack; #ifdef CONFIG_TIMER_STATS int start_pid; void *start_site; char start_comm[16]; #endif #ifdef CONFIG_LOCKDEP struct lockdep_map lockdep_map; #endif }; extern struct tvec_base boot_tvec_bases; #ifdef CONFIG_LOCKDEP /* * NB: because we have to copy the lockdep_map, setting the lockdep_map key * (second argument) here is required, otherwise it could be initialised to * the copy of the lockdep_map later! We use the pointer to and the string * "<file>:<line>" as the key resp. the name of the lockdep_map. */ #define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn) \ .lockdep_map = STATIC_LOCKDEP_MAP_INIT(_kn, &_kn), #else #define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn) #endif /* * Note that all tvec_bases are at least 4 byte aligned and lower two bits * of base in timer_list is guaranteed to be zero. Use them for flags. * * A deferrable timer will work normally when the system is busy, but * will not cause a CPU to come out of idle just to service it; instead, * the timer will be serviced when the CPU eventually wakes up with a * subsequent non-deferrable timer. * * An irqsafe timer is executed with IRQ disabled and it's safe to wait for * the completion of the running instance from IRQ handlers, for example, * by calling del_timer_sync(). * * Note: The irq disabled callback execution is a special case for * workqueue locking issues. It's not meant for executing random crap * with interrupts disabled. Abuse is monitored! */ #define TIMER_DEFERRABLE 0x1LU #define TIMER_IRQSAFE 0x2LU #define TIMER_FLAG_MASK 0x3LU #define __TIMER_INITIALIZER(_function, _expires, _data, _flags) { \ .entry = { .prev = TIMER_ENTRY_STATIC }, \ .function = (_function), \ .expires = (_expires), \ .data = (_data), \ .base = (void *)((unsigned long)&boot_tvec_bases + (_flags)), \ .slack = -1, \ __TIMER_LOCKDEP_MAP_INITIALIZER( \ __FILE__ ":" __stringify(__LINE__)) \ } #define TIMER_INITIALIZER(_function, _expires, _data) \ __TIMER_INITIALIZER((_function), (_expires), (_data), 0) #define TIMER_DEFERRED_INITIALIZER(_function, _expires, _data) \ __TIMER_INITIALIZER((_function), (_expires), (_data), TIMER_DEFERRABLE) #define DEFINE_TIMER(_name, _function, _expires, _data) \ struct timer_list _name = \ TIMER_INITIALIZER(_function, _expires, _data) void init_timer_key(struct timer_list *timer, unsigned int flags, const char *name, struct lock_class_key *key); #ifdef CONFIG_DEBUG_OBJECTS_TIMERS extern void init_timer_on_stack_key(struct timer_list *timer, unsigned int flags, const char *name, struct lock_class_key *key); extern void destroy_timer_on_stack(struct timer_list *timer); #else static inline void destroy_timer_on_stack(struct timer_list *timer) { } static inline void init_timer_on_stack_key(struct timer_list *timer, unsigned int flags, const char *name, struct lock_class_key *key) { init_timer_key(timer, flags, name, key); } #endif #ifdef CONFIG_LOCKDEP #define __init_timer(_timer, _flags) \ do { \ static struct lock_class_key __key; \ init_timer_key((_timer), (_flags), #_timer, &__key); \ } while (0) #define __init_timer_on_stack(_timer, _flags) \ do { \ static struct lock_class_key __key; \ init_timer_on_stack_key((_timer), (_flags), #_timer, &__key); \ } while (0) #else #define __init_timer(_timer, _flags) \ init_timer_key((_timer), (_flags), NULL, NULL) #define __init_timer_on_stack(_timer, _flags) \ init_timer_on_stack_key((_timer), (_flags), NULL, NULL) #endif #define init_timer(timer) \ __init_timer((timer), 0) #define init_timer_deferrable(timer) \ __init_timer((timer), TIMER_DEFERRABLE) #define init_timer_on_stack(timer) \ __init_timer_on_stack((timer), 0) #define __setup_timer(_timer, _fn, _data, _flags) \ do { \ __init_timer((_timer), (_flags)); \ (_timer)->function = (_fn); \ (_timer)->data = (_data); \ } while (0) #define __setup_timer_on_stack(_timer, _fn, _data, _flags) \ do { \ __init_timer_on_stack((_timer), (_flags)); \ (_timer)->function = (_fn); \ (_timer)->data = (_data); \ } while (0) #define setup_timer(timer, fn, data) \ __setup_timer((timer), (fn), (data), 0) #define setup_timer_on_stack(timer, fn, data) \ __setup_timer_on_stack((timer), (fn), (data), 0) #define setup_deferrable_timer_on_stack(timer, fn, data) \ __setup_timer_on_stack((timer), (fn), (data), TIMER_DEFERRABLE) /** * timer_pending - is a timer pending? * @timer: the timer in question * * timer_pending will tell whether a given timer is currently pending, * or not. Callers must ensure serialization wrt. other operations done * to this timer, eg. interrupt contexts, or other CPUs on SMP. * * return value: 1 if the timer is pending, 0 if not. */ static inline int timer_pending(const struct timer_list * timer) { return timer->entry.next != NULL; } extern void add_timer_on(struct timer_list *timer, int cpu); extern int del_timer(struct timer_list * timer); extern int mod_timer(struct timer_list *timer, unsigned long expires); extern int mod_timer_pending(struct timer_list *timer, unsigned long expires); extern int mod_timer_pinned(struct timer_list *timer, unsigned long expires); extern void set_timer_slack(struct timer_list *time, int slack_hz); #define TIMER_NOT_PINNED 0 #define TIMER_PINNED 1 /* * The jiffies value which is added to now, when there is no timer * in the timer wheel: */ #define NEXT_TIMER_MAX_DELTA ((1UL << 30) - 1) /* * Return when the next timer-wheel timeout occurs (in absolute jiffies), * locks the timer base and does the comparison against the given * jiffie. */ extern unsigned long get_next_timer_interrupt(unsigned long now); /* * Timer-statistics info: */ #ifdef CONFIG_TIMER_STATS extern int timer_stats_active; #define TIMER_STATS_FLAG_DEFERRABLE 0x1 extern void init_timer_stats(void); extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf, void *timerf, char *comm, unsigned int timer_flag); extern void __timer_stats_timer_set_start_info(struct timer_list *timer, void *addr); static inline void timer_stats_timer_set_start_info(struct timer_list *timer) { if (likely(!timer_stats_active)) return; __timer_stats_timer_set_start_info(timer, __builtin_return_address(0)); } static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) { timer->start_site = NULL; } #else static inline void init_timer_stats(void) { } static inline void timer_stats_timer_set_start_info(struct timer_list *timer) { } static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) { } #endif extern void add_timer(struct timer_list *timer); extern int try_to_del_timer_sync(struct timer_list *timer); #ifdef CONFIG_SMP extern int del_timer_sync(struct timer_list *timer); #else # define del_timer_sync(t) del_timer(t) #endif #define del_singleshot_timer_sync(t) del_timer_sync(t) extern void init_timers(void); extern void run_local_timers(void); struct hrtimer; extern enum hrtimer_restart it_real_fn(struct hrtimer *); unsigned long __round_jiffies(unsigned long j, int cpu); unsigned long __round_jiffies_relative(unsigned long j, int cpu); unsigned long round_jiffies(unsigned long j); unsigned long round_jiffies_relative(unsigned long j); unsigned long __round_jiffies_up(unsigned long j, int cpu); unsigned long __round_jiffies_up_relative(unsigned long j, int cpu); unsigned long round_jiffies_up(unsigned long j); unsigned long round_jiffies_up_relative(unsigned long j); #endif