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227 lines
7.4 KiB
227 lines
7.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_TIMER_H |
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#define _LINUX_TIMER_H |
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#include <linux/list.h> |
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#include <linux/ktime.h> |
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#include <linux/stddef.h> |
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#include <linux/debugobjects.h> |
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#include <linux/stringify.h> |
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struct timer_list { |
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/* |
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* All fields that change during normal runtime grouped to the |
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* same cacheline |
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*/ |
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struct hlist_node entry; |
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unsigned long expires; |
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void (*function)(struct timer_list *); |
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u32 flags; |
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#ifdef CONFIG_LOCKDEP |
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struct lockdep_map lockdep_map; |
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#endif |
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}; |
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#ifdef CONFIG_LOCKDEP |
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/* |
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* NB: because we have to copy the lockdep_map, setting the lockdep_map key |
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* (second argument) here is required, otherwise it could be initialised to |
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* the copy of the lockdep_map later! We use the pointer to and the string |
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* "<file>:<line>" as the key resp. the name of the lockdep_map. |
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*/ |
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#define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn) \ |
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.lockdep_map = STATIC_LOCKDEP_MAP_INIT(_kn, &_kn), |
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#else |
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#define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn) |
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#endif |
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/** |
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* @TIMER_DEFERRABLE: A deferrable timer will work normally when the |
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* system is busy, but will not cause a CPU to come out of idle just |
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* to service it; instead, the timer will be serviced when the CPU |
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* eventually wakes up with a subsequent non-deferrable timer. |
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* |
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* @TIMER_IRQSAFE: An irqsafe timer is executed with IRQ disabled and |
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* it's safe to wait for the completion of the running instance from |
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* IRQ handlers, for example, by calling del_timer_sync(). |
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* |
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* Note: The irq disabled callback execution is a special case for |
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* workqueue locking issues. It's not meant for executing random crap |
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* with interrupts disabled. Abuse is monitored! |
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* |
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* @TIMER_PINNED: A pinned timer will not be affected by any timer |
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* placement heuristics (like, NOHZ) and will always expire on the CPU |
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* on which the timer was enqueued. |
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* |
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* Note: Because enqueuing of timers can migrate the timer from one |
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* CPU to another, pinned timers are not guaranteed to stay on the |
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* initialy selected CPU. They move to the CPU on which the enqueue |
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* function is invoked via mod_timer() or add_timer(). If the timer |
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* should be placed on a particular CPU, then add_timer_on() has to be |
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* used. |
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*/ |
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#define TIMER_CPUMASK 0x0003FFFF |
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#define TIMER_MIGRATING 0x00040000 |
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#define TIMER_BASEMASK (TIMER_CPUMASK | TIMER_MIGRATING) |
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#define TIMER_DEFERRABLE 0x00080000 |
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#define TIMER_PINNED 0x00100000 |
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#define TIMER_IRQSAFE 0x00200000 |
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#define TIMER_INIT_FLAGS (TIMER_DEFERRABLE | TIMER_PINNED | TIMER_IRQSAFE) |
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#define TIMER_ARRAYSHIFT 22 |
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#define TIMER_ARRAYMASK 0xFFC00000 |
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#define TIMER_TRACE_FLAGMASK (TIMER_MIGRATING | TIMER_DEFERRABLE | TIMER_PINNED | TIMER_IRQSAFE) |
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#define __TIMER_INITIALIZER(_function, _flags) { \ |
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.entry = { .next = TIMER_ENTRY_STATIC }, \ |
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.function = (_function), \ |
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.flags = (_flags), \ |
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__TIMER_LOCKDEP_MAP_INITIALIZER( \ |
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__FILE__ ":" __stringify(__LINE__)) \ |
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} |
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#define DEFINE_TIMER(_name, _function) \ |
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struct timer_list _name = \ |
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__TIMER_INITIALIZER(_function, 0) |
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/* |
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* LOCKDEP and DEBUG timer interfaces. |
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*/ |
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void init_timer_key(struct timer_list *timer, |
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void (*func)(struct timer_list *), unsigned int flags, |
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const char *name, struct lock_class_key *key); |
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#ifdef CONFIG_DEBUG_OBJECTS_TIMERS |
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extern void init_timer_on_stack_key(struct timer_list *timer, |
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void (*func)(struct timer_list *), |
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unsigned int flags, const char *name, |
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struct lock_class_key *key); |
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#else |
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static inline void init_timer_on_stack_key(struct timer_list *timer, |
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void (*func)(struct timer_list *), |
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unsigned int flags, |
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const char *name, |
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struct lock_class_key *key) |
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{ |
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init_timer_key(timer, func, flags, name, key); |
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} |
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#endif |
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#ifdef CONFIG_LOCKDEP |
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#define __init_timer(_timer, _fn, _flags) \ |
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do { \ |
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static struct lock_class_key __key; \ |
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init_timer_key((_timer), (_fn), (_flags), #_timer, &__key);\ |
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} while (0) |
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#define __init_timer_on_stack(_timer, _fn, _flags) \ |
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do { \ |
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static struct lock_class_key __key; \ |
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init_timer_on_stack_key((_timer), (_fn), (_flags), \ |
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#_timer, &__key); \ |
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} while (0) |
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#else |
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#define __init_timer(_timer, _fn, _flags) \ |
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init_timer_key((_timer), (_fn), (_flags), NULL, NULL) |
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#define __init_timer_on_stack(_timer, _fn, _flags) \ |
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init_timer_on_stack_key((_timer), (_fn), (_flags), NULL, NULL) |
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#endif |
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/** |
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* timer_setup - prepare a timer for first use |
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* @timer: the timer in question |
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* @callback: the function to call when timer expires |
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* @flags: any TIMER_* flags |
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* |
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* Regular timer initialization should use either DEFINE_TIMER() above, |
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* or timer_setup(). For timers on the stack, timer_setup_on_stack() must |
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* be used and must be balanced with a call to destroy_timer_on_stack(). |
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*/ |
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#define timer_setup(timer, callback, flags) \ |
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__init_timer((timer), (callback), (flags)) |
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#define timer_setup_on_stack(timer, callback, flags) \ |
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__init_timer_on_stack((timer), (callback), (flags)) |
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#ifdef CONFIG_DEBUG_OBJECTS_TIMERS |
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extern void destroy_timer_on_stack(struct timer_list *timer); |
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#else |
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static inline void destroy_timer_on_stack(struct timer_list *timer) { } |
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#endif |
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#define from_timer(var, callback_timer, timer_fieldname) \ |
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container_of(callback_timer, typeof(*var), timer_fieldname) |
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/** |
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* timer_pending - is a timer pending? |
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* @timer: the timer in question |
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* |
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* timer_pending will tell whether a given timer is currently pending, |
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* or not. Callers must ensure serialization wrt. other operations done |
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* to this timer, eg. interrupt contexts, or other CPUs on SMP. |
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* |
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* return value: 1 if the timer is pending, 0 if not. |
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*/ |
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static inline int timer_pending(const struct timer_list * timer) |
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{ |
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return !hlist_unhashed_lockless(&timer->entry); |
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} |
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extern void add_timer_on(struct timer_list *timer, int cpu); |
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extern int del_timer(struct timer_list * timer); |
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extern int mod_timer(struct timer_list *timer, unsigned long expires); |
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extern int mod_timer_pending(struct timer_list *timer, unsigned long expires); |
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extern int timer_reduce(struct timer_list *timer, unsigned long expires); |
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/* |
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* The jiffies value which is added to now, when there is no timer |
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* in the timer wheel: |
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*/ |
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#define NEXT_TIMER_MAX_DELTA ((1UL << 30) - 1) |
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extern void add_timer(struct timer_list *timer); |
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extern int try_to_del_timer_sync(struct timer_list *timer); |
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#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT) |
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extern int del_timer_sync(struct timer_list *timer); |
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#else |
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# define del_timer_sync(t) del_timer(t) |
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#endif |
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#define del_singleshot_timer_sync(t) del_timer_sync(t) |
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extern bool timer_curr_running(struct timer_list *timer); |
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extern void init_timers(void); |
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struct hrtimer; |
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extern enum hrtimer_restart it_real_fn(struct hrtimer *); |
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#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) |
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struct ctl_table; |
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extern unsigned int sysctl_timer_migration; |
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int timer_migration_handler(struct ctl_table *table, int write, |
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void *buffer, size_t *lenp, loff_t *ppos); |
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#endif |
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unsigned long __round_jiffies(unsigned long j, int cpu); |
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unsigned long __round_jiffies_relative(unsigned long j, int cpu); |
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unsigned long round_jiffies(unsigned long j); |
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unsigned long round_jiffies_relative(unsigned long j); |
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unsigned long __round_jiffies_up(unsigned long j, int cpu); |
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unsigned long __round_jiffies_up_relative(unsigned long j, int cpu); |
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unsigned long round_jiffies_up(unsigned long j); |
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unsigned long round_jiffies_up_relative(unsigned long j); |
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#ifdef CONFIG_HOTPLUG_CPU |
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int timers_prepare_cpu(unsigned int cpu); |
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int timers_dead_cpu(unsigned int cpu); |
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#else |
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#define timers_prepare_cpu NULL |
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#define timers_dead_cpu NULL |
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#endif |
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#endif
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