[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / hrtimer.h

/*
 *  include/linux/hrtimer.h
 *
 *  hrtimers - High-resolution kernel timers
 *
 *   Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de>
 *   Copyright(C) 2005, Red Hat, Inc., Ingo Molnar
 *
 *  data type definitions, declarations, prototypes
 *
 *  Started by: Thomas Gleixner and Ingo Molnar
 *
 *  For licencing details see kernel-base/COPYING
 */
#ifndef _LINUX_HRTIMER_H
#define _LINUX_HRTIMER_H

#include <linux/rbtree.h>
#include <linux/ktime.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/wait.h>
#include <linux/percpu.h>
#include <linux/timer.h>
#include <linux/timerqueue.h>

struct hrtimer_clock_base;
struct hrtimer_cpu_base;

/*
 * Mode arguments of xxx_hrtimer functions:
 */
enum hrtimer_mode {
	HRTIMER_MODE_ABS = 0x0,		/* Time value is absolute */
	HRTIMER_MODE_REL = 0x1,		/* Time value is relative to now */
	HRTIMER_MODE_PINNED = 0x02,	/* Timer is bound to CPU */
	HRTIMER_MODE_ABS_PINNED = 0x02,
	HRTIMER_MODE_REL_PINNED = 0x03,
};

/*
 * Return values for the callback function
 */
enum hrtimer_restart {
	HRTIMER_NORESTART,	/* Timer is not restarted */
	HRTIMER_RESTART,	/* Timer must be restarted */
};

/*
 * Values to track state of the timer
 *
 * Possible states:
 *
 * 0x00		inactive
 * 0x01		enqueued into rbtree
 * 0x02		callback function running
 * 0x04		timer is migrated to another cpu
 *
 * Special cases:
 * 0x03		callback function running and enqueued
 *		(was requeued on another CPU)
 * 0x05		timer was migrated on CPU hotunplug
 *
 * The "callback function running and enqueued" status is only possible on
 * SMP. It happens for example when a posix timer expired and the callback
 * queued a signal. Between dropping the lock which protects the posix timer
 * and reacquiring the base lock of the hrtimer, another CPU can deliver the
 * signal and rearm the timer. We have to preserve the callback running state,
 * as otherwise the timer could be removed before the softirq code finishes the
 * the handling of the timer.
 *
 * The HRTIMER_STATE_ENQUEUED bit is always or'ed to the current state
 * to preserve the HRTIMER_STATE_CALLBACK in the above scenario. This
 * also affects HRTIMER_STATE_MIGRATE where the preservation is not
 * necessary. HRTIMER_STATE_MIGRATE is cleared after the timer is
 * enqueued on the new cpu.
 *
 * All state transitions are protected by cpu_base->lock.
 */
#define HRTIMER_STATE_INACTIVE	0x00
#define HRTIMER_STATE_ENQUEUED	0x01
#define HRTIMER_STATE_CALLBACK	0x02
#define HRTIMER_STATE_MIGRATE	0x04

/**
 * struct hrtimer - the basic hrtimer structure
 * @node:	timerqueue node, which also manages node.expires,
 *		the absolute expiry time in the hrtimers internal
 *		representation. The time is related to the clock on
 *		which the timer is based. Is setup by adding
 *		slack to the _softexpires value. For non range timers
 *		identical to _softexpires.
 * @_softexpires: the absolute earliest expiry time of the hrtimer.
 *		The time which was given as expiry time when the timer
 *		was armed.
 * @function:	timer expiry callback function
 * @base:	pointer to the timer base (per cpu and per clock)
 * @state:	state information (See bit values above)
 * @start_site:	timer statistics field to store the site where the timer
 *		was started
 * @start_comm: timer statistics field to store the name of the process which
 *		started the timer
 * @start_pid: timer statistics field to store the pid of the task which
 *		started the timer
 *
 * The hrtimer structure must be initialized by hrtimer_init()
 */
struct hrtimer {
	struct timerqueue_node		node;
	ktime_t				_softexpires;
	enum hrtimer_restart		(*function)(struct hrtimer *);
	struct hrtimer_clock_base	*base;
	unsigned long			state;
#ifdef CONFIG_TIMER_STATS
	int				start_pid;
	void				*start_site;
	char				start_comm[16];
#endif
};

/**
 * struct hrtimer_sleeper - simple sleeper structure
 * @timer:	embedded timer structure
 * @task:	task to wake up
 *
 * task is set to NULL, when the timer expires.
 */
struct hrtimer_sleeper {
	struct hrtimer timer;
	struct task_struct *task;
};

/**
 * struct hrtimer_clock_base - the timer base for a specific clock
 * @cpu_base:		per cpu clock base
 * @index:		clock type index for per_cpu support when moving a
 *			timer to a base on another cpu.
 * @clockid:		clock id for per_cpu support
 * @active:		red black tree root node for the active timers
 * @resolution:		the resolution of the clock, in nanoseconds
 * @get_time:		function to retrieve the current time of the clock
 * @softirq_time:	the time when running the hrtimer queue in the softirq
 * @offset:		offset of this clock to the monotonic base
 */
struct hrtimer_clock_base {
	struct hrtimer_cpu_base	*cpu_base;
	int			index;
	clockid_t		clockid;
	struct timerqueue_head	active;
	ktime_t			resolution;
	ktime_t			(*get_time)(void);
	ktime_t			softirq_time;
	ktime_t			offset;
};

enum  hrtimer_base_type {
	HRTIMER_BASE_MONOTONIC,
	HRTIMER_BASE_REALTIME,
	HRTIMER_BASE_BOOTTIME,
	HRTIMER_MAX_CLOCK_BASES,
};

/*
 * struct hrtimer_cpu_base - the per cpu clock bases
 * @lock:		lock protecting the base and associated clock bases
 *			and timers
 * @active_bases:	Bitfield to mark bases with active timers
 * @expires_next:	absolute time of the next event which was scheduled
 *			via clock_set_next_event()
 * @hres_active:	State of high resolution mode
 * @hang_detected:	The last hrtimer interrupt detected a hang
 * @nr_events:		Total number of hrtimer interrupt events
 * @nr_retries:		Total number of hrtimer interrupt retries
 * @nr_hangs:		Total number of hrtimer interrupt hangs
 * @max_hang_time:	Maximum time spent in hrtimer_interrupt
 * @clock_base:		array of clock bases for this cpu
 */
struct hrtimer_cpu_base {
	raw_spinlock_t			lock;
	unsigned long			active_bases;
#ifdef CONFIG_HIGH_RES_TIMERS
	ktime_t				expires_next;
	int				hres_active;
	int				hang_detected;
	unsigned long			nr_events;
	unsigned long			nr_retries;
	unsigned long			nr_hangs;
	ktime_t				max_hang_time;
#endif
	struct hrtimer_clock_base	clock_base[HRTIMER_MAX_CLOCK_BASES];
};

static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time)
{
	timer->node.expires = time;
	timer->_softexpires = time;
}

static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta)
{
	timer->_softexpires = time;
	timer->node.expires = ktime_add_safe(time, delta);
}

static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, unsigned long delta)
{
	timer->_softexpires = time;
	timer->node.expires = ktime_add_safe(time, ns_to_ktime(delta));
}

static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64)
{
	timer->node.expires.tv64 = tv64;
	timer->_softexpires.tv64 = tv64;
}

static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time)
{
	timer->node.expires = ktime_add_safe(timer->node.expires, time);
	timer->_softexpires = ktime_add_safe(timer->_softexpires, time);
}

static inline void hrtimer_add_expires_ns(struct hrtimer *timer, u64 ns)
{
	timer->node.expires = ktime_add_ns(timer->node.expires, ns);
	timer->_softexpires = ktime_add_ns(timer->_softexpires, ns);
}

static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer)
{
	return timer->node.expires;
}

static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer)
{
	return timer->_softexpires;
}

static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer)
{
	return timer->node.expires.tv64;
}
static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer)
{
	return timer->_softexpires.tv64;
}

static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer)
{
	return ktime_to_ns(timer->node.expires);
}

static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer)
{
	return ktime_sub(timer->node.expires, timer->base->get_time());
}

#ifdef CONFIG_HIGH_RES_TIMERS
struct clock_event_device;

extern void hrtimer_interrupt(struct clock_event_device *dev);

/*
 * In high resolution mode the time reference must be read accurate
 */
static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
{
	return timer->base->get_time();
}

static inline int hrtimer_is_hres_active(struct hrtimer *timer)
{
	return timer->base->cpu_base->hres_active;
}

extern void hrtimer_peek_ahead_timers(void);

/*
 * The resolution of the clocks. The resolution value is returned in
 * the clock_getres() system call to give application programmers an
 * idea of the (in)accuracy of timers. Timer values are rounded up to
 * this resolution values.
 */
# define HIGH_RES_NSEC		1
# define KTIME_HIGH_RES		(ktime_t) { .tv64 = HIGH_RES_NSEC }
# define MONOTONIC_RES_NSEC	HIGH_RES_NSEC
# define KTIME_MONOTONIC_RES	KTIME_HIGH_RES

#else

# define MONOTONIC_RES_NSEC	LOW_RES_NSEC
# define KTIME_MONOTONIC_RES	KTIME_LOW_RES

static inline void hrtimer_peek_ahead_timers(void) { }

/*
 * In non high resolution mode the time reference is taken from
 * the base softirq time variable.
 */
static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
{
	return timer->base->softirq_time;
}

static inline int hrtimer_is_hres_active(struct hrtimer *timer)
{
	return 0;
}
#endif

extern void clock_was_set(void);
#ifdef CONFIG_TIMERFD
extern void timerfd_clock_was_set(void);
#else
static inline void timerfd_clock_was_set(void) { }
#endif
extern void hrtimers_resume(void);

extern ktime_t ktime_get(void);
extern ktime_t ktime_get_real(void);
extern ktime_t ktime_get_boottime(void);
extern ktime_t ktime_get_monotonic_offset(void);

DECLARE_PER_CPU(struct tick_device, tick_cpu_device);


/* Exported timer functions: */

/* Initialize timers: */
extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock,
			 enum hrtimer_mode mode);

#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock,
				  enum hrtimer_mode mode);

extern void destroy_hrtimer_on_stack(struct hrtimer *timer);
#else
static inline void hrtimer_init_on_stack(struct hrtimer *timer,
					 clockid_t which_clock,
					 enum hrtimer_mode mode)
{
	hrtimer_init(timer, which_clock, mode);
}
static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { }
#endif

/* Basic timer operations: */
extern int hrtimer_start(struct hrtimer *timer, ktime_t tim,
			 const enum hrtimer_mode mode);
extern int hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
			unsigned long range_ns, const enum hrtimer_mode mode);
extern int
__hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
			 unsigned long delta_ns,
			 const enum hrtimer_mode mode, int wakeup);

extern int hrtimer_cancel(struct hrtimer *timer);
extern int hrtimer_try_to_cancel(struct hrtimer *timer);

static inline int hrtimer_start_expires(struct hrtimer *timer,
						enum hrtimer_mode mode)
{
	unsigned long delta;
	ktime_t soft, hard;
	soft = hrtimer_get_softexpires(timer);
	hard = hrtimer_get_expires(timer);
	delta = ktime_to_ns(ktime_sub(hard, soft));
	return hrtimer_start_range_ns(timer, soft, delta, mode);
}

static inline int hrtimer_restart(struct hrtimer *timer)
{
	return hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
}

/* Query timers: */
extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer);
extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp);

extern ktime_t hrtimer_get_next_event(void);

/*
 * A timer is active, when it is enqueued into the rbtree or the
 * callback function is running or it's in the state of being migrated
 * to another cpu.
 */
static inline int hrtimer_active(const struct hrtimer *timer)
{
	return timer->state != HRTIMER_STATE_INACTIVE;
}

/*
 * Helper function to check, whether the timer is on one of the queues
 */
static inline int hrtimer_is_queued(struct hrtimer *timer)
{
	return timer->state & HRTIMER_STATE_ENQUEUED;
}

/*
 * Helper function to check, whether the timer is running the callback
 * function
 */
static inline int hrtimer_callback_running(struct hrtimer *timer)
{
	return timer->state & HRTIMER_STATE_CALLBACK;
}

/* Forward a hrtimer so it expires after now: */
extern u64
hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval);

/* Forward a hrtimer so it expires after the hrtimer's current now */
static inline u64 hrtimer_forward_now(struct hrtimer *timer,
				      ktime_t interval)
{
	return hrtimer_forward(timer, timer->base->get_time(), interval);
}

/* Precise sleep: */
extern long hrtimer_nanosleep(struct timespec *rqtp,
			      struct timespec __user *rmtp,
			      const enum hrtimer_mode mode,
			      const clockid_t clockid);
extern long hrtimer_nanosleep_restart(struct restart_block *restart_block);

extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
				 struct task_struct *tsk);

extern int schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
						const enum hrtimer_mode mode);
extern int schedule_hrtimeout_range_clock(ktime_t *expires,
		unsigned long delta, const enum hrtimer_mode mode, int clock);
extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode);

/* Soft interrupt function to run the hrtimer queues: */
extern void hrtimer_run_queues(void);
extern void hrtimer_run_pending(void);

/* Bootup initialization: */
extern void __init hrtimers_init(void);

#if BITS_PER_LONG < 64
extern u64 ktime_divns(const ktime_t kt, s64 div);
#else /* BITS_PER_LONG < 64 */
# define ktime_divns(kt, div)		(u64)((kt).tv64 / (div))
#endif

/* Show pending timers: */
extern void sysrq_timer_list_show(void);

#endif
Commit	Line	Data
c0a31329 TG	1	/*
	2	* include/linux/hrtimer.h
	3	*
	4	* hrtimers - High-resolution kernel timers
	5	*
	6	* Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de>
	7	* Copyright(C) 2005, Red Hat, Inc., Ingo Molnar
	8	*
	9	* data type definitions, declarations, prototypes
	10	*
	11	* Started by: Thomas Gleixner and Ingo Molnar
	12	*
	13	* For licencing details see kernel-base/COPYING
	14	*/
	15	#ifndef _LINUX_HRTIMER_H
	16	#define _LINUX_HRTIMER_H
	17
	18	#include <linux/rbtree.h>
	19	#include <linux/ktime.h>
	20	#include <linux/init.h>
	21	#include <linux/list.h>
	22	#include <linux/wait.h>
40b86062	23	#include <linux/percpu.h>
507e1231	24	#include <linux/timer.h>
998adc3d	25	#include <linux/timerqueue.h>
c0a31329	26
3c8aa39d TG	27	struct hrtimer_clock_base;
	28	struct hrtimer_cpu_base;
	29
c0a31329 TG	30	/*
	31	* Mode arguments of xxx_hrtimer functions:
	32	*/
	33	enum hrtimer_mode {
597d0275 AB	34	HRTIMER_MODE_ABS = 0x0, /* Time value is absolute */
	35	HRTIMER_MODE_REL = 0x1, /* Time value is relative to now */
	36	HRTIMER_MODE_PINNED = 0x02, /* Timer is bound to CPU */
	37	HRTIMER_MODE_ABS_PINNED = 0x02,
	38	HRTIMER_MODE_REL_PINNED = 0x03,
c0a31329 TG	39	};
c0a31329 TG	40
c9cb2e3d TG	41	/*
	42	* Return values for the callback function
	43	*/
c0a31329	44	enum hrtimer_restart {
c9cb2e3d TG	45	HRTIMER_NORESTART, /* Timer is not restarted */
c9cb2e3d TG	46	HRTIMER_RESTART, /* Timer must be restarted */
c0a31329 TG	47	};
c0a31329 TG	48
54cdfdb4 TG	49	/*
54cdfdb4 TG	50	* Values to track state of the timer
303e967f TG	51	*
	52	* Possible states:
	53	*
	54	* 0x00 inactive
	55	* 0x01 enqueued into rbtree
	56	* 0x02 callback function running
53370d2e	57	* 0x04 timer is migrated to another cpu
54cdfdb4	58	*
b00c1a99	59	* Special cases:
303e967f TG	60	* 0x03 callback function running and enqueued
303e967f TG	61	* (was requeued on another CPU)
53370d2e TG	62	* 0x05 timer was migrated on CPU hotunplug
53370d2e TG	63	*
303e967f TG	64	* The "callback function running and enqueued" status is only possible on
	65	* SMP. It happens for example when a posix timer expired and the callback
	66	* queued a signal. Between dropping the lock which protects the posix timer
	67	* and reacquiring the base lock of the hrtimer, another CPU can deliver the
	68	* signal and rearm the timer. We have to preserve the callback running state,
	69	* as otherwise the timer could be removed before the softirq code finishes the
	70	* the handling of the timer.
	71	*
53370d2e TG	72	* The HRTIMER_STATE_ENQUEUED bit is always or'ed to the current state
	73	* to preserve the HRTIMER_STATE_CALLBACK in the above scenario. This
	74	* also affects HRTIMER_STATE_MIGRATE where the preservation is not
	75	* necessary. HRTIMER_STATE_MIGRATE is cleared after the timer is
	76	* enqueued on the new cpu.
303e967f TG	77	*
	78	* All state transitions are protected by cpu_base->lock.
	79	*/
	80	#define HRTIMER_STATE_INACTIVE 0x00
	81	#define HRTIMER_STATE_ENQUEUED 0x01
	82	#define HRTIMER_STATE_CALLBACK 0x02
ca109491	83	#define HRTIMER_STATE_MIGRATE 0x04
303e967f	84
c0a31329 TG	85	/**
c0a31329 TG	86	* struct hrtimer - the basic hrtimer structure
998adc3d JS	87	* @node: timerqueue node, which also manages node.expires,
998adc3d JS	88	* the absolute expiry time in the hrtimers internal
c0a31329	89	* representation. The time is related to the clock on
592aa999 TG	90	* which the timer is based. Is setup by adding
	91	* slack to the _softexpires value. For non range timers
	92	* identical to _softexpires.
	93	* @_softexpires: the absolute earliest expiry time of the hrtimer.
	94	* The time which was given as expiry time when the timer
	95	* was armed.
c0a31329	96	* @function: timer expiry callback function
c0a31329	97	* @base: pointer to the timer base (per cpu and per clock)
303e967f	98	* @state: state information (See bit values above)
54cdfdb4 TG	99	* @start_site: timer statistics field to store the site where the timer
	100	* was started
	101	* @start_comm: timer statistics field to store the name of the process which
	102	* started the timer
	103	* @start_pid: timer statistics field to store the pid of the task which
	104	* started the timer
c0a31329	105	*
54cdfdb4	106	* The hrtimer structure must be initialized by hrtimer_init()
c0a31329 TG	107	*/
c0a31329 TG	108	struct hrtimer {
998adc3d	109	struct timerqueue_node node;
654c8e0b	110	ktime_t _softexpires;
3c8aa39d TG	111	enum hrtimer_restart (function)(struct hrtimer );
3c8aa39d TG	112	struct hrtimer_clock_base *base;
303e967f	113	unsigned long state;
82f67cd9	114	#ifdef CONFIG_TIMER_STATS
1b024690	115	int start_pid;
82f67cd9 IM	116	void *start_site;
82f67cd9 IM	117	char start_comm[16];
82f67cd9	118	#endif
c0a31329 TG	119	};
c0a31329 TG	120
00362e33 TG	121	/**
00362e33 TG	122	* struct hrtimer_sleeper - simple sleeper structure
00362e33 TG	123	* @timer: embedded timer structure
	124	* @task: task to wake up
	125	*
	126	* task is set to NULL, when the timer expires.
	127	*/
	128	struct hrtimer_sleeper {
	129	struct hrtimer timer;
	130	struct task_struct *task;
	131	};
	132
c0a31329	133	/**
d1d67174	134	* struct hrtimer_clock_base - the timer base for a specific clock
05fb6bf0	135	* @cpu_base: per cpu clock base
3c8aa39d TG	136	* @index: clock type index for per_cpu support when moving a
3c8aa39d TG	137	* timer to a base on another cpu.
4d258b25	138	* @clockid: clock id for per_cpu support
92127c7a	139	* @active: red black tree root node for the active timers
92127c7a TG	140	* @resolution: the resolution of the clock, in nanoseconds
92127c7a TG	141	* @get_time: function to retrieve the current time of the clock
92127c7a	142	* @softirq_time: the time when running the hrtimer queue in the softirq
54cdfdb4	143	* @offset: offset of this clock to the monotonic base
c0a31329	144	*/
3c8aa39d TG	145	struct hrtimer_clock_base {
3c8aa39d TG	146	struct hrtimer_cpu_base *cpu_base;
ab8177bc TG	147	int index;
ab8177bc TG	148	clockid_t clockid;
998adc3d	149	struct timerqueue_head active;
e2787630	150	ktime_t resolution;
c0a31329	151	ktime_t (*get_time)(void);
92127c7a	152	ktime_t softirq_time;
54cdfdb4	153	ktime_t offset;
3c8aa39d TG	154	};
3c8aa39d TG	155
e06383db	156	enum hrtimer_base_type {
e06383db	157	HRTIMER_BASE_MONOTONIC,
68fa61c0	158	HRTIMER_BASE_REALTIME,
70a08cca	159	HRTIMER_BASE_BOOTTIME,
e06383db JS	160	HRTIMER_MAX_CLOCK_BASES,
e06383db JS	161	};
3c8aa39d TG	162
	163	/*
	164	* struct hrtimer_cpu_base - the per cpu clock bases
	165	* @lock: lock protecting the base and associated clock bases
	166	* and timers
ab8177bc	167	* @active_bases: Bitfield to mark bases with active timers
54cdfdb4 TG	168	* @expires_next: absolute time of the next event which was scheduled
	169	* via clock_set_next_event()
	170	* @hres_active: State of high resolution mode
41d2e494 TG	171	* @hang_detected: The last hrtimer interrupt detected a hang
	172	* @nr_events: Total number of hrtimer interrupt events
	173	* @nr_retries: Total number of hrtimer interrupt retries
	174	* @nr_hangs: Total number of hrtimer interrupt hangs
	175	* @max_hang_time: Maximum time spent in hrtimer_interrupt
ab8177bc	176	* @clock_base: array of clock bases for this cpu
3c8aa39d TG	177	*/
3c8aa39d TG	178	struct hrtimer_cpu_base {
ecb49d1a	179	raw_spinlock_t lock;
ab8177bc	180	unsigned long active_bases;
54cdfdb4 TG	181	#ifdef CONFIG_HIGH_RES_TIMERS
	182	ktime_t expires_next;
	183	int hres_active;
41d2e494	184	int hang_detected;
54cdfdb4	185	unsigned long nr_events;
41d2e494 TG	186	unsigned long nr_retries;
	187	unsigned long nr_hangs;
	188	ktime_t max_hang_time;
54cdfdb4	189	#endif
f24444b0	190	struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES];
c0a31329 TG	191	};
c0a31329 TG	192
63ca243b AV	193	static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time)
63ca243b AV	194	{
998adc3d	195	timer->node.expires = time;
654c8e0b	196	timer->_softexpires = time;
63ca243b	197	}
654c8e0b AV	198
	199	static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta)
	200	{
	201	timer->_softexpires = time;
998adc3d	202	timer->node.expires = ktime_add_safe(time, delta);
654c8e0b AV	203	}
	204
	205	static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, unsigned long delta)
	206	{
	207	timer->_softexpires = time;
998adc3d	208	timer->node.expires = ktime_add_safe(time, ns_to_ktime(delta));
654c8e0b AV	209	}
654c8e0b AV	210
63ca243b AV	211	static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64)
63ca243b AV	212	{
998adc3d	213	timer->node.expires.tv64 = tv64;
654c8e0b	214	timer->_softexpires.tv64 = tv64;
63ca243b AV	215	}
	216
	217	static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time)
	218	{
998adc3d	219	timer->node.expires = ktime_add_safe(timer->node.expires, time);
654c8e0b	220	timer->_softexpires = ktime_add_safe(timer->_softexpires, time);
63ca243b AV	221	}
63ca243b AV	222
7597bc94	223	static inline void hrtimer_add_expires_ns(struct hrtimer *timer, u64 ns)
63ca243b	224	{
998adc3d	225	timer->node.expires = ktime_add_ns(timer->node.expires, ns);
654c8e0b	226	timer->_softexpires = ktime_add_ns(timer->_softexpires, ns);
63ca243b AV	227	}
	228
	229	static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer)
	230	{
998adc3d	231	return timer->node.expires;
63ca243b AV	232	}
63ca243b AV	233
654c8e0b AV	234	static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer)
	235	{
	236	return timer->_softexpires;
	237	}
	238
63ca243b AV	239	static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer)
63ca243b AV	240	{
998adc3d	241	return timer->node.expires.tv64;
63ca243b	242	}
654c8e0b AV	243	static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer)
	244	{
	245	return timer->_softexpires.tv64;
	246	}
63ca243b AV	247
	248	static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer)
	249	{
998adc3d	250	return ktime_to_ns(timer->node.expires);
63ca243b AV	251	}
	252
	253	static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer)
	254	{
998adc3d	255	return ktime_sub(timer->node.expires, timer->base->get_time());
63ca243b AV	256	}
63ca243b AV	257
54cdfdb4 TG	258	#ifdef CONFIG_HIGH_RES_TIMERS
	259	struct clock_event_device;
	260
54cdfdb4 TG	261	extern void hrtimer_interrupt(struct clock_event_device *dev);
	262
	263	/*
	264	* In high resolution mode the time reference must be read accurate
	265	*/
	266	static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
	267	{
	268	return timer->base->get_time();
	269	}
	270
8f4d37ec PZ	271	static inline int hrtimer_is_hres_active(struct hrtimer *timer)
	272	{
	273	return timer->base->cpu_base->hres_active;
	274	}
	275
2075eb8d AV	276	extern void hrtimer_peek_ahead_timers(void);
2075eb8d AV	277
54cdfdb4 TG	278	/*
	279	* The resolution of the clocks. The resolution value is returned in
	280	* the clock_getres() system call to give application programmers an
	281	* idea of the (in)accuracy of timers. Timer values are rounded up to
	282	* this resolution values.
	283	*/
151db1fc TB	284	# define HIGH_RES_NSEC 1
	285	# define KTIME_HIGH_RES (ktime_t) { .tv64 = HIGH_RES_NSEC }
	286	# define MONOTONIC_RES_NSEC HIGH_RES_NSEC
54cdfdb4 TG	287	# define KTIME_MONOTONIC_RES KTIME_HIGH_RES
	288
	289	#else
	290
151db1fc	291	# define MONOTONIC_RES_NSEC LOW_RES_NSEC
54cdfdb4 TG	292	# define KTIME_MONOTONIC_RES KTIME_LOW_RES
54cdfdb4 TG	293
2075eb8d	294	static inline void hrtimer_peek_ahead_timers(void) { }
54cdfdb4 TG	295
	296	/*
	297	* In non high resolution mode the time reference is taken from
	298	* the base softirq time variable.
	299	*/
	300	static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
	301	{
	302	return timer->base->softirq_time;
	303	}
	304
8f4d37ec PZ	305	static inline int hrtimer_is_hres_active(struct hrtimer *timer)
	306	{
	307	return 0;
	308	}
54cdfdb4 TG	309	#endif
54cdfdb4 TG	310
b12a03ce	311	extern void clock_was_set(void);
9ec26907 TG	312	#ifdef CONFIG_TIMERFD
	313	extern void timerfd_clock_was_set(void);
	314	#else
	315	static inline void timerfd_clock_was_set(void) { }
	316	#endif
b12a03ce TG	317	extern void hrtimers_resume(void);
b12a03ce TG	318
d316c57f TG	319	extern ktime_t ktime_get(void);
d316c57f TG	320	extern ktime_t ktime_get_real(void);
abb3a4ea	321	extern ktime_t ktime_get_boottime(void);
99ee5315	322	extern ktime_t ktime_get_monotonic_offset(void);
becf8b5d	323
2e94d1f7	324	DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
2e94d1f7 AV	325
2e94d1f7 AV	326
c0a31329 TG	327	/* Exported timer functions: */
	328
	329	/* Initialize timers: */
7978672c GA	330	extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock,
7978672c GA	331	enum hrtimer_mode mode);
c0a31329	332
237fc6e7 TG	333	#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
	334	extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock,
	335	enum hrtimer_mode mode);
	336
	337	extern void destroy_hrtimer_on_stack(struct hrtimer *timer);
	338	#else
	339	static inline void hrtimer_init_on_stack(struct hrtimer *timer,
	340	clockid_t which_clock,
	341	enum hrtimer_mode mode)
	342	{
	343	hrtimer_init(timer, which_clock, mode);
	344	}
	345	static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { }
	346	#endif
	347
c0a31329 TG	348	/* Basic timer operations: */
	349	extern int hrtimer_start(struct hrtimer *timer, ktime_t tim,
	350	const enum hrtimer_mode mode);
da8f2e17 AV	351	extern int hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
da8f2e17 AV	352	unsigned long range_ns, const enum hrtimer_mode mode);
7f1e2ca9 PZ	353	extern int
	354	__hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
	355	unsigned long delta_ns,
	356	const enum hrtimer_mode mode, int wakeup);
	357
c0a31329 TG	358	extern int hrtimer_cancel(struct hrtimer *timer);
	359	extern int hrtimer_try_to_cancel(struct hrtimer *timer);
	360
63ca243b AV	361	static inline int hrtimer_start_expires(struct hrtimer *timer,
	362	enum hrtimer_mode mode)
	363	{
da8f2e17 AV	364	unsigned long delta;
	365	ktime_t soft, hard;
	366	soft = hrtimer_get_softexpires(timer);
	367	hard = hrtimer_get_expires(timer);
	368	delta = ktime_to_ns(ktime_sub(hard, soft));
4ce105d3	369	return hrtimer_start_range_ns(timer, soft, delta, mode);
63ca243b AV	370	}
63ca243b AV	371
c9cb2e3d TG	372	static inline int hrtimer_restart(struct hrtimer *timer)
c9cb2e3d TG	373	{
654c8e0b	374	return hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
c9cb2e3d	375	}
c0a31329 TG	376
	377	/* Query timers: */
	378	extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer);
	379	extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp);
	380
69239749	381	extern ktime_t hrtimer_get_next_event(void);
69239749	382
303e967f	383	/*
53370d2e TG	384	* A timer is active, when it is enqueued into the rbtree or the
	385	* callback function is running or it's in the state of being migrated
	386	* to another cpu.
303e967f	387	*/
c0a31329 TG	388	static inline int hrtimer_active(const struct hrtimer *timer)
c0a31329 TG	389	{
303e967f	390	return timer->state != HRTIMER_STATE_INACTIVE;
c0a31329 TG	391	}
c0a31329 TG	392
54cdfdb4 TG	393	/*
	394	* Helper function to check, whether the timer is on one of the queues
	395	*/
	396	static inline int hrtimer_is_queued(struct hrtimer *timer)
	397	{
ca109491	398	return timer->state & HRTIMER_STATE_ENQUEUED;
54cdfdb4 TG	399	}
54cdfdb4 TG	400
4346f654 OH	401	/*
	402	* Helper function to check, whether the timer is running the callback
	403	* function
	404	*/
	405	static inline int hrtimer_callback_running(struct hrtimer *timer)
	406	{
	407	return timer->state & HRTIMER_STATE_CALLBACK;
	408	}
	409
c0a31329	410	/* Forward a hrtimer so it expires after now: */
4d672e7a	411	extern u64
44f21475	412	hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval);
c0a31329	413
5e05ad7d	414	/* Forward a hrtimer so it expires after the hrtimer's current now */
4d672e7a DL	415	static inline u64 hrtimer_forward_now(struct hrtimer *timer,
4d672e7a DL	416	ktime_t interval)
5e05ad7d DL	417	{
	418	return hrtimer_forward(timer, timer->base->get_time(), interval);
	419	}
	420
10c94ec1 TG	421	/* Precise sleep: */
10c94ec1 TG	422	extern long hrtimer_nanosleep(struct timespec *rqtp,
080344b9	423	struct timespec __user *rmtp,
10c94ec1 TG	424	const enum hrtimer_mode mode,
10c94ec1 TG	425	const clockid_t clockid);
1711ef38	426	extern long hrtimer_nanosleep_restart(struct restart_block *restart_block);
10c94ec1	427
00362e33 TG	428	extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
	429	struct task_struct *tsk);
	430
654c8e0b AV	431	extern int schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
654c8e0b AV	432	const enum hrtimer_mode mode);
351b3f7a CE	433	extern int schedule_hrtimeout_range_clock(ktime_t *expires,
351b3f7a CE	434	unsigned long delta, const enum hrtimer_mode mode, int clock);
7bb67439 AV	435	extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode);
7bb67439 AV	436
c0a31329 TG	437	/* Soft interrupt function to run the hrtimer queues: */
c0a31329 TG	438	extern void hrtimer_run_queues(void);
d3d74453	439	extern void hrtimer_run_pending(void);
c0a31329 TG	440
	441	/* Bootup initialization: */
	442	extern void __init hrtimers_init(void);
	443
79bf2bb3	444	#if BITS_PER_LONG < 64
4d672e7a	445	extern u64 ktime_divns(const ktime_t kt, s64 div);
79bf2bb3	446	#else /* BITS_PER_LONG < 64 */
4d672e7a	447	# define ktime_divns(kt, div) (u64)((kt).tv64 / (div))
79bf2bb3 TG	448	#endif
79bf2bb3 TG	449
88ad0bf6 IM	450	/* Show pending timers: */
	451	extern void sysrq_timer_list_show(void);
	452
c0a31329	453	#endif