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Thomas Gleixnerc0a31322006-01-09 20:52:32 -08001/*
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>
Stephen Rothwell40b86062008-10-15 14:20:28 +110023#include <linux/percpu.h>
24
Thomas Gleixnerc0a31322006-01-09 20:52:32 -080025
Thomas Gleixner3c8aa392007-02-16 01:27:50 -080026struct hrtimer_clock_base;
27struct hrtimer_cpu_base;
28
Thomas Gleixnerc0a31322006-01-09 20:52:32 -080029/*
30 * Mode arguments of xxx_hrtimer functions:
31 */
32enum hrtimer_mode {
Thomas Gleixnerc9cb2e32007-02-16 01:27:49 -080033 HRTIMER_MODE_ABS, /* Time value is absolute */
34 HRTIMER_MODE_REL, /* Time value is relative to now */
Thomas Gleixnerc0a31322006-01-09 20:52:32 -080035};
36
Thomas Gleixnerc9cb2e32007-02-16 01:27:49 -080037/*
38 * Return values for the callback function
39 */
Thomas Gleixnerc0a31322006-01-09 20:52:32 -080040enum hrtimer_restart {
Thomas Gleixnerc9cb2e32007-02-16 01:27:49 -080041 HRTIMER_NORESTART, /* Timer is not restarted */
42 HRTIMER_RESTART, /* Timer must be restarted */
Thomas Gleixnerc0a31322006-01-09 20:52:32 -080043};
44
Thomas Gleixner303e9672007-02-16 01:27:51 -080045/*
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -080046 * Values to track state of the timer
Thomas Gleixner303e9672007-02-16 01:27:51 -080047 *
48 * Possible states:
49 *
50 * 0x00 inactive
51 * 0x01 enqueued into rbtree
52 * 0x02 callback function running
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -080053 *
Thomas Gleixnerb00c1a92008-09-29 15:44:46 +020054 * Special cases:
Thomas Gleixner303e9672007-02-16 01:27:51 -080055 * 0x03 callback function running and enqueued
56 * (was requeued on another CPU)
Thomas Gleixnerb00c1a92008-09-29 15:44:46 +020057 * 0x09 timer was migrated on CPU hotunplug
Thomas Gleixner303e9672007-02-16 01:27:51 -080058 * The "callback function running and enqueued" status is only possible on
59 * SMP. It happens for example when a posix timer expired and the callback
60 * queued a signal. Between dropping the lock which protects the posix timer
61 * and reacquiring the base lock of the hrtimer, another CPU can deliver the
62 * signal and rearm the timer. We have to preserve the callback running state,
63 * as otherwise the timer could be removed before the softirq code finishes the
64 * the handling of the timer.
65 *
Li Zefan3eb05672008-02-08 04:19:25 -080066 * The HRTIMER_STATE_ENQUEUED bit is always or'ed to the current state to
Thomas Gleixner303e9672007-02-16 01:27:51 -080067 * preserve the HRTIMER_STATE_CALLBACK bit in the above scenario.
68 *
69 * All state transitions are protected by cpu_base->lock.
70 */
71#define HRTIMER_STATE_INACTIVE 0x00
72#define HRTIMER_STATE_ENQUEUED 0x01
73#define HRTIMER_STATE_CALLBACK 0x02
Peter Zijlstraca109492008-11-25 12:43:51 +010074#define HRTIMER_STATE_MIGRATE 0x04
Thomas Gleixner303e9672007-02-16 01:27:51 -080075
Thomas Gleixnerc0a31322006-01-09 20:52:32 -080076/**
77 * struct hrtimer - the basic hrtimer structure
Thomas Gleixnerc0a31322006-01-09 20:52:32 -080078 * @node: red black tree node for time ordered insertion
Thomas Gleixner592aa992008-10-20 16:38:19 +020079 * @_expires: the absolute expiry time in the hrtimers internal
Thomas Gleixnerc0a31322006-01-09 20:52:32 -080080 * representation. The time is related to the clock on
Thomas Gleixner592aa992008-10-20 16:38:19 +020081 * which the timer is based. Is setup by adding
82 * slack to the _softexpires value. For non range timers
83 * identical to _softexpires.
84 * @_softexpires: the absolute earliest expiry time of the hrtimer.
85 * The time which was given as expiry time when the timer
86 * was armed.
Thomas Gleixnerc0a31322006-01-09 20:52:32 -080087 * @function: timer expiry callback function
Thomas Gleixnerc0a31322006-01-09 20:52:32 -080088 * @base: pointer to the timer base (per cpu and per clock)
Thomas Gleixner303e9672007-02-16 01:27:51 -080089 * @state: state information (See bit values above)
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -080090 * @cb_entry: list head to enqueue an expired timer into the callback list
91 * @start_site: timer statistics field to store the site where the timer
92 * was started
93 * @start_comm: timer statistics field to store the name of the process which
94 * started the timer
95 * @start_pid: timer statistics field to store the pid of the task which
96 * started the timer
Thomas Gleixnerc0a31322006-01-09 20:52:32 -080097 *
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -080098 * The hrtimer structure must be initialized by hrtimer_init()
Thomas Gleixnerc0a31322006-01-09 20:52:32 -080099 */
100struct hrtimer {
Thomas Gleixner3c8aa392007-02-16 01:27:50 -0800101 struct rb_node node;
Arjan van de Ven799b64d2008-09-01 15:27:58 -0700102 ktime_t _expires;
Arjan van de Ven654c8e02008-09-01 15:47:08 -0700103 ktime_t _softexpires;
Thomas Gleixner3c8aa392007-02-16 01:27:50 -0800104 enum hrtimer_restart (*function)(struct hrtimer *);
105 struct hrtimer_clock_base *base;
Thomas Gleixner303e9672007-02-16 01:27:51 -0800106 unsigned long state;
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800107 struct list_head cb_entry;
Ingo Molnar82f67cd2007-02-16 01:28:13 -0800108#ifdef CONFIG_TIMER_STATS
Richard Kennedy1b024692008-09-22 14:42:43 -0700109 int start_pid;
Ingo Molnar82f67cd2007-02-16 01:28:13 -0800110 void *start_site;
111 char start_comm[16];
Ingo Molnar82f67cd2007-02-16 01:28:13 -0800112#endif
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800113};
114
115/**
Thomas Gleixner00362e32006-03-31 02:31:17 -0800116 * struct hrtimer_sleeper - simple sleeper structure
Thomas Gleixner00362e32006-03-31 02:31:17 -0800117 * @timer: embedded timer structure
118 * @task: task to wake up
119 *
120 * task is set to NULL, when the timer expires.
121 */
122struct hrtimer_sleeper {
123 struct hrtimer timer;
124 struct task_struct *task;
125};
126
127/**
Andres Salomond1d67172007-03-06 01:42:07 -0800128 * struct hrtimer_clock_base - the timer base for a specific clock
Randy Dunlap05fb6bf2007-02-28 20:12:13 -0800129 * @cpu_base: per cpu clock base
Thomas Gleixner3c8aa392007-02-16 01:27:50 -0800130 * @index: clock type index for per_cpu support when moving a
131 * timer to a base on another cpu.
Thomas Gleixner92127c72006-03-26 01:38:05 -0800132 * @active: red black tree root node for the active timers
133 * @first: pointer to the timer node which expires first
134 * @resolution: the resolution of the clock, in nanoseconds
135 * @get_time: function to retrieve the current time of the clock
Thomas Gleixner92127c72006-03-26 01:38:05 -0800136 * @softirq_time: the time when running the hrtimer queue in the softirq
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800137 * @offset: offset of this clock to the monotonic base
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800138 */
Thomas Gleixner3c8aa392007-02-16 01:27:50 -0800139struct hrtimer_clock_base {
140 struct hrtimer_cpu_base *cpu_base;
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800141 clockid_t index;
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800142 struct rb_root active;
Thomas Gleixner288867e2006-01-12 11:25:54 +0100143 struct rb_node *first;
Thomas Gleixnere2787632006-01-12 11:36:14 +0100144 ktime_t resolution;
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800145 ktime_t (*get_time)(void);
Thomas Gleixner92127c72006-03-26 01:38:05 -0800146 ktime_t softirq_time;
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800147#ifdef CONFIG_HIGH_RES_TIMERS
148 ktime_t offset;
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800149#endif
Thomas Gleixner3c8aa392007-02-16 01:27:50 -0800150};
151
152#define HRTIMER_MAX_CLOCK_BASES 2
153
154/*
155 * struct hrtimer_cpu_base - the per cpu clock bases
156 * @lock: lock protecting the base and associated clock bases
157 * and timers
Thomas Gleixner3c8aa392007-02-16 01:27:50 -0800158 * @clock_base: array of clock bases for this cpu
159 * @curr_timer: the timer which is executing a callback right now
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800160 * @expires_next: absolute time of the next event which was scheduled
161 * via clock_set_next_event()
162 * @hres_active: State of high resolution mode
163 * @check_clocks: Indictator, when set evaluate time source and clock
164 * event devices whether high resolution mode can be
165 * activated.
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800166 * @nr_events: Total number of timer interrupt events
Thomas Gleixner3c8aa392007-02-16 01:27:50 -0800167 */
168struct hrtimer_cpu_base {
169 spinlock_t lock;
Thomas Gleixner3c8aa392007-02-16 01:27:50 -0800170 struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES];
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800171#ifdef CONFIG_HIGH_RES_TIMERS
172 ktime_t expires_next;
173 int hres_active;
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800174 unsigned long nr_events;
175#endif
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800176};
177
Arjan van de Ven63ca2432008-09-01 14:35:02 -0700178static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time)
179{
Arjan van de Ven799b64d2008-09-01 15:27:58 -0700180 timer->_expires = time;
Arjan van de Ven654c8e02008-09-01 15:47:08 -0700181 timer->_softexpires = time;
Arjan van de Ven63ca2432008-09-01 14:35:02 -0700182}
Arjan van de Ven654c8e02008-09-01 15:47:08 -0700183
184static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta)
185{
186 timer->_softexpires = time;
187 timer->_expires = ktime_add_safe(time, delta);
188}
189
190static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, unsigned long delta)
191{
192 timer->_softexpires = time;
193 timer->_expires = ktime_add_safe(time, ns_to_ktime(delta));
194}
195
Arjan van de Ven63ca2432008-09-01 14:35:02 -0700196static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64)
197{
Arjan van de Ven799b64d2008-09-01 15:27:58 -0700198 timer->_expires.tv64 = tv64;
Arjan van de Ven654c8e02008-09-01 15:47:08 -0700199 timer->_softexpires.tv64 = tv64;
Arjan van de Ven63ca2432008-09-01 14:35:02 -0700200}
201
202static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time)
203{
Arjan van de Ven799b64d2008-09-01 15:27:58 -0700204 timer->_expires = ktime_add_safe(timer->_expires, time);
Arjan van de Ven654c8e02008-09-01 15:47:08 -0700205 timer->_softexpires = ktime_add_safe(timer->_softexpires, time);
Arjan van de Ven63ca2432008-09-01 14:35:02 -0700206}
207
David Howells7597bc92008-11-05 17:38:47 +0000208static inline void hrtimer_add_expires_ns(struct hrtimer *timer, u64 ns)
Arjan van de Ven63ca2432008-09-01 14:35:02 -0700209{
Arjan van de Ven799b64d2008-09-01 15:27:58 -0700210 timer->_expires = ktime_add_ns(timer->_expires, ns);
Arjan van de Ven654c8e02008-09-01 15:47:08 -0700211 timer->_softexpires = ktime_add_ns(timer->_softexpires, ns);
Arjan van de Ven63ca2432008-09-01 14:35:02 -0700212}
213
214static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer)
215{
Arjan van de Ven799b64d2008-09-01 15:27:58 -0700216 return timer->_expires;
Arjan van de Ven63ca2432008-09-01 14:35:02 -0700217}
218
Arjan van de Ven654c8e02008-09-01 15:47:08 -0700219static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer)
220{
221 return timer->_softexpires;
222}
223
Arjan van de Ven63ca2432008-09-01 14:35:02 -0700224static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer)
225{
Arjan van de Ven799b64d2008-09-01 15:27:58 -0700226 return timer->_expires.tv64;
Arjan van de Ven63ca2432008-09-01 14:35:02 -0700227}
Arjan van de Ven654c8e02008-09-01 15:47:08 -0700228static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer)
229{
230 return timer->_softexpires.tv64;
231}
Arjan van de Ven63ca2432008-09-01 14:35:02 -0700232
233static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer)
234{
Arjan van de Ven799b64d2008-09-01 15:27:58 -0700235 return ktime_to_ns(timer->_expires);
Arjan van de Ven63ca2432008-09-01 14:35:02 -0700236}
237
238static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer)
239{
Arjan van de Ven799b64d2008-09-01 15:27:58 -0700240 return ktime_sub(timer->_expires, timer->base->get_time());
Arjan van de Ven63ca2432008-09-01 14:35:02 -0700241}
242
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800243#ifdef CONFIG_HIGH_RES_TIMERS
244struct clock_event_device;
245
246extern void clock_was_set(void);
Ingo Molnar995f0542007-04-07 12:05:00 +0200247extern void hres_timers_resume(void);
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800248extern void hrtimer_interrupt(struct clock_event_device *dev);
249
250/*
251 * In high resolution mode the time reference must be read accurate
252 */
253static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
254{
255 return timer->base->get_time();
256}
257
Peter Zijlstra8f4d37e2008-01-25 21:08:29 +0100258static inline int hrtimer_is_hres_active(struct hrtimer *timer)
259{
260 return timer->base->cpu_base->hres_active;
261}
262
Arjan van de Ven2075eb82008-10-07 10:57:54 -0700263extern void hrtimer_peek_ahead_timers(void);
264
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800265/*
266 * The resolution of the clocks. The resolution value is returned in
267 * the clock_getres() system call to give application programmers an
268 * idea of the (in)accuracy of timers. Timer values are rounded up to
269 * this resolution values.
270 */
Tony Breeds151db1f2008-02-08 09:24:52 +1100271# define HIGH_RES_NSEC 1
272# define KTIME_HIGH_RES (ktime_t) { .tv64 = HIGH_RES_NSEC }
273# define MONOTONIC_RES_NSEC HIGH_RES_NSEC
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800274# define KTIME_MONOTONIC_RES KTIME_HIGH_RES
275
276#else
277
Tony Breeds151db1f2008-02-08 09:24:52 +1100278# define MONOTONIC_RES_NSEC LOW_RES_NSEC
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800279# define KTIME_MONOTONIC_RES KTIME_LOW_RES
280
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800281/*
282 * clock_was_set() is a NOP for non- high-resolution systems. The
283 * time-sorted order guarantees that a timer does not expire early and
284 * is expired in the next softirq when the clock was advanced.
285 */
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800286static inline void clock_was_set(void) { }
Arjan van de Ven2075eb82008-10-07 10:57:54 -0700287static inline void hrtimer_peek_ahead_timers(void) { }
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800288
Ingo Molnar995f0542007-04-07 12:05:00 +0200289static inline void hres_timers_resume(void) { }
290
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800291/*
292 * In non high resolution mode the time reference is taken from
293 * the base softirq time variable.
294 */
295static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
296{
297 return timer->base->softirq_time;
298}
299
Peter Zijlstra8f4d37e2008-01-25 21:08:29 +0100300static inline int hrtimer_is_hres_active(struct hrtimer *timer)
301{
302 return 0;
303}
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800304#endif
305
Thomas Gleixnerd316c572007-02-16 01:28:00 -0800306extern ktime_t ktime_get(void);
307extern ktime_t ktime_get_real(void);
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800308
Arjan van de Ven2e94d1f2008-09-10 16:06:00 -0700309
310DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
Arjan van de Ven2e94d1f2008-09-10 16:06:00 -0700311
312
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800313/* Exported timer functions: */
314
315/* Initialize timers: */
George Anzinger7978672c2006-02-01 03:05:11 -0800316extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock,
317 enum hrtimer_mode mode);
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800318
Thomas Gleixner237fc6e2008-04-30 00:55:04 -0700319#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
320extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock,
321 enum hrtimer_mode mode);
322
323extern void destroy_hrtimer_on_stack(struct hrtimer *timer);
324#else
325static inline void hrtimer_init_on_stack(struct hrtimer *timer,
326 clockid_t which_clock,
327 enum hrtimer_mode mode)
328{
329 hrtimer_init(timer, which_clock, mode);
330}
331static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { }
332#endif
333
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800334/* Basic timer operations: */
335extern int hrtimer_start(struct hrtimer *timer, ktime_t tim,
336 const enum hrtimer_mode mode);
Arjan van de Venda8f2e12008-09-07 10:47:46 -0700337extern int hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
338 unsigned long range_ns, const enum hrtimer_mode mode);
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800339extern int hrtimer_cancel(struct hrtimer *timer);
340extern int hrtimer_try_to_cancel(struct hrtimer *timer);
341
Arjan van de Ven63ca2432008-09-01 14:35:02 -0700342static inline int hrtimer_start_expires(struct hrtimer *timer,
343 enum hrtimer_mode mode)
344{
Arjan van de Venda8f2e12008-09-07 10:47:46 -0700345 unsigned long delta;
346 ktime_t soft, hard;
347 soft = hrtimer_get_softexpires(timer);
348 hard = hrtimer_get_expires(timer);
349 delta = ktime_to_ns(ktime_sub(hard, soft));
Arjan van de Ven4ce105d2008-09-07 15:31:39 -0700350 return hrtimer_start_range_ns(timer, soft, delta, mode);
Arjan van de Ven63ca2432008-09-01 14:35:02 -0700351}
352
Thomas Gleixnerc9cb2e32007-02-16 01:27:49 -0800353static inline int hrtimer_restart(struct hrtimer *timer)
354{
Arjan van de Ven654c8e02008-09-01 15:47:08 -0700355 return hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
Thomas Gleixnerc9cb2e32007-02-16 01:27:49 -0800356}
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800357
358/* Query timers: */
359extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer);
360extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp);
361
Tony Lindgren69239742006-03-06 15:42:45 -0800362extern ktime_t hrtimer_get_next_event(void);
Tony Lindgren69239742006-03-06 15:42:45 -0800363
Thomas Gleixner303e9672007-02-16 01:27:51 -0800364/*
365 * A timer is active, when it is enqueued into the rbtree or the callback
366 * function is running.
367 */
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800368static inline int hrtimer_active(const struct hrtimer *timer)
369{
Thomas Gleixner303e9672007-02-16 01:27:51 -0800370 return timer->state != HRTIMER_STATE_INACTIVE;
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800371}
372
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800373/*
374 * Helper function to check, whether the timer is on one of the queues
375 */
376static inline int hrtimer_is_queued(struct hrtimer *timer)
377{
Peter Zijlstraca109492008-11-25 12:43:51 +0100378 return timer->state & HRTIMER_STATE_ENQUEUED;
Thomas Gleixner54cdfdb2007-02-16 01:28:11 -0800379}
380
Oliver Hartkopp4346f652008-04-30 23:04:37 +0200381/*
382 * Helper function to check, whether the timer is running the callback
383 * function
384 */
385static inline int hrtimer_callback_running(struct hrtimer *timer)
386{
387 return timer->state & HRTIMER_STATE_CALLBACK;
388}
389
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800390/* Forward a hrtimer so it expires after now: */
Davide Libenzi4d672e72008-02-04 22:27:26 -0800391extern u64
Roman Zippel44f21472006-03-26 01:38:06 -0800392hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval);
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800393
Davide Libenzi5e05ad72008-02-04 22:27:25 -0800394/* Forward a hrtimer so it expires after the hrtimer's current now */
Davide Libenzi4d672e72008-02-04 22:27:26 -0800395static inline u64 hrtimer_forward_now(struct hrtimer *timer,
396 ktime_t interval)
Davide Libenzi5e05ad72008-02-04 22:27:25 -0800397{
398 return hrtimer_forward(timer, timer->base->get_time(), interval);
399}
400
Thomas Gleixner10c94ec2006-01-09 20:52:35 -0800401/* Precise sleep: */
402extern long hrtimer_nanosleep(struct timespec *rqtp,
Oleg Nesterov080344b2008-02-01 17:29:05 +0300403 struct timespec __user *rmtp,
Thomas Gleixner10c94ec2006-01-09 20:52:35 -0800404 const enum hrtimer_mode mode,
405 const clockid_t clockid);
Toyo Abe1711ef32006-09-29 02:00:28 -0700406extern long hrtimer_nanosleep_restart(struct restart_block *restart_block);
Thomas Gleixner10c94ec2006-01-09 20:52:35 -0800407
Thomas Gleixner00362e32006-03-31 02:31:17 -0800408extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
409 struct task_struct *tsk);
410
Arjan van de Ven654c8e02008-09-01 15:47:08 -0700411extern int schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
412 const enum hrtimer_mode mode);
Arjan van de Ven7bb67432008-08-31 08:05:58 -0700413extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode);
414
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800415/* Soft interrupt function to run the hrtimer queues: */
416extern void hrtimer_run_queues(void);
Peter Zijlstrad3d74452008-01-25 21:08:31 +0100417extern void hrtimer_run_pending(void);
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800418
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800419/* Bootup initialization: */
420extern void __init hrtimers_init(void);
421
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -0800422#if BITS_PER_LONG < 64
Davide Libenzi4d672e72008-02-04 22:27:26 -0800423extern u64 ktime_divns(const ktime_t kt, s64 div);
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -0800424#else /* BITS_PER_LONG < 64 */
Davide Libenzi4d672e72008-02-04 22:27:26 -0800425# define ktime_divns(kt, div) (u64)((kt).tv64 / (div))
Thomas Gleixner79bf2bb2007-02-16 01:28:03 -0800426#endif
427
Ingo Molnar88ad0bf62007-02-16 01:28:16 -0800428/* Show pending timers: */
429extern void sysrq_timer_list_show(void);
430
Ingo Molnar82f67cd2007-02-16 01:28:13 -0800431/*
432 * Timer-statistics info:
433 */
434#ifdef CONFIG_TIMER_STATS
435
436extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
Venki Pallipadic5c061b82007-07-15 23:40:30 -0700437 void *timerf, char *comm,
438 unsigned int timer_flag);
Ingo Molnar82f67cd2007-02-16 01:28:13 -0800439
440static inline void timer_stats_account_hrtimer(struct hrtimer *timer)
441{
442 timer_stats_update_stats(timer, timer->start_pid, timer->start_site,
Venki Pallipadic5c061b82007-07-15 23:40:30 -0700443 timer->function, timer->start_comm, 0);
Ingo Molnar82f67cd2007-02-16 01:28:13 -0800444}
445
446extern void __timer_stats_hrtimer_set_start_info(struct hrtimer *timer,
447 void *addr);
448
449static inline void timer_stats_hrtimer_set_start_info(struct hrtimer *timer)
450{
451 __timer_stats_hrtimer_set_start_info(timer, __builtin_return_address(0));
452}
453
454static inline void timer_stats_hrtimer_clear_start_info(struct hrtimer *timer)
455{
456 timer->start_site = NULL;
457}
458#else
459static inline void timer_stats_account_hrtimer(struct hrtimer *timer)
460{
461}
462
463static inline void timer_stats_hrtimer_set_start_info(struct hrtimer *timer)
464{
465}
466
467static inline void timer_stats_hrtimer_clear_start_info(struct hrtimer *timer)
468{
469}
470#endif
471
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800472#endif