226 lines
7.3 KiB
C
226 lines
7.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#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 timer_list {
|
|
/*
|
|
* All fields that change during normal runtime grouped to the
|
|
* same cacheline
|
|
*/
|
|
struct hlist_node entry;
|
|
unsigned long expires;
|
|
void (*function)(struct timer_list *);
|
|
u32 flags;
|
|
|
|
#ifdef CONFIG_LOCKDEP
|
|
struct lockdep_map lockdep_map;
|
|
#endif
|
|
};
|
|
|
|
#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
|
|
|
|
/**
|
|
* @TIMER_DEFERRABLE: 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.
|
|
*
|
|
* @TIMER_IRQSAFE: 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!
|
|
*
|
|
* @TIMER_PINNED: A pinned timer will not be affected by any timer
|
|
* placement heuristics (like, NOHZ) and will always expire on the CPU
|
|
* on which the timer was enqueued.
|
|
*
|
|
* Note: Because enqueuing of timers can migrate the timer from one
|
|
* CPU to another, pinned timers are not guaranteed to stay on the
|
|
* initialy selected CPU. They move to the CPU on which the enqueue
|
|
* function is invoked via mod_timer() or add_timer(). If the timer
|
|
* should be placed on a particular CPU, then add_timer_on() has to be
|
|
* used.
|
|
*/
|
|
#define TIMER_CPUMASK 0x0003FFFF
|
|
#define TIMER_MIGRATING 0x00040000
|
|
#define TIMER_BASEMASK (TIMER_CPUMASK | TIMER_MIGRATING)
|
|
#define TIMER_DEFERRABLE 0x00080000
|
|
#define TIMER_PINNED 0x00100000
|
|
#define TIMER_IRQSAFE 0x00200000
|
|
#define TIMER_ARRAYSHIFT 22
|
|
#define TIMER_ARRAYMASK 0xFFC00000
|
|
|
|
#define TIMER_TRACE_FLAGMASK (TIMER_MIGRATING | TIMER_DEFERRABLE | TIMER_PINNED | TIMER_IRQSAFE)
|
|
|
|
#define __TIMER_INITIALIZER(_function, _flags) { \
|
|
.entry = { .next = TIMER_ENTRY_STATIC }, \
|
|
.function = (_function), \
|
|
.flags = (_flags), \
|
|
__TIMER_LOCKDEP_MAP_INITIALIZER( \
|
|
__FILE__ ":" __stringify(__LINE__)) \
|
|
}
|
|
|
|
#define DEFINE_TIMER(_name, _function) \
|
|
struct timer_list _name = \
|
|
__TIMER_INITIALIZER(_function, 0)
|
|
|
|
/*
|
|
* LOCKDEP and DEBUG timer interfaces.
|
|
*/
|
|
void init_timer_key(struct timer_list *timer,
|
|
void (*func)(struct timer_list *), 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,
|
|
void (*func)(struct timer_list *),
|
|
unsigned int flags, const char *name,
|
|
struct lock_class_key *key);
|
|
#else
|
|
static inline void init_timer_on_stack_key(struct timer_list *timer,
|
|
void (*func)(struct timer_list *),
|
|
unsigned int flags,
|
|
const char *name,
|
|
struct lock_class_key *key)
|
|
{
|
|
init_timer_key(timer, func, flags, name, key);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_LOCKDEP
|
|
#define __init_timer(_timer, _fn, _flags) \
|
|
do { \
|
|
static struct lock_class_key __key; \
|
|
init_timer_key((_timer), (_fn), (_flags), #_timer, &__key);\
|
|
} while (0)
|
|
|
|
#define __init_timer_on_stack(_timer, _fn, _flags) \
|
|
do { \
|
|
static struct lock_class_key __key; \
|
|
init_timer_on_stack_key((_timer), (_fn), (_flags), \
|
|
#_timer, &__key); \
|
|
} while (0)
|
|
#else
|
|
#define __init_timer(_timer, _fn, _flags) \
|
|
init_timer_key((_timer), (_fn), (_flags), NULL, NULL)
|
|
#define __init_timer_on_stack(_timer, _fn, _flags) \
|
|
init_timer_on_stack_key((_timer), (_fn), (_flags), NULL, NULL)
|
|
#endif
|
|
|
|
/**
|
|
* timer_setup - prepare a timer for first use
|
|
* @timer: the timer in question
|
|
* @callback: the function to call when timer expires
|
|
* @flags: any TIMER_* flags
|
|
*
|
|
* Regular timer initialization should use either DEFINE_TIMER() above,
|
|
* or timer_setup(). For timers on the stack, timer_setup_on_stack() must
|
|
* be used and must be balanced with a call to destroy_timer_on_stack().
|
|
*/
|
|
#define timer_setup(timer, callback, flags) \
|
|
__init_timer((timer), (callback), (flags))
|
|
|
|
#define timer_setup_on_stack(timer, callback, flags) \
|
|
__init_timer_on_stack((timer), (callback), (flags))
|
|
|
|
#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
|
|
extern void destroy_timer_on_stack(struct timer_list *timer);
|
|
#else
|
|
static inline void destroy_timer_on_stack(struct timer_list *timer) { }
|
|
#endif
|
|
|
|
#define from_timer(var, callback_timer, timer_fieldname) \
|
|
container_of(callback_timer, typeof(*var), timer_fieldname)
|
|
|
|
/**
|
|
* 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 !hlist_unhashed_lockless(&timer->entry);
|
|
}
|
|
|
|
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 timer_reduce(struct timer_list *timer, unsigned long expires);
|
|
|
|
/*
|
|
* 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)
|
|
|
|
extern void add_timer(struct timer_list *timer);
|
|
|
|
extern int try_to_del_timer_sync(struct timer_list *timer);
|
|
|
|
#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT)
|
|
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 *);
|
|
|
|
#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
|
|
struct ctl_table;
|
|
|
|
extern unsigned int sysctl_timer_migration;
|
|
int timer_migration_handler(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos);
|
|
#endif
|
|
|
|
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);
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
int timers_prepare_cpu(unsigned int cpu);
|
|
int timers_dead_cpu(unsigned int cpu);
|
|
#else
|
|
#define timers_prepare_cpu NULL
|
|
#define timers_dead_cpu NULL
|
|
#endif
|
|
|
|
#endif
|