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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>
23#include <linux/percpu.h>
24#include <linux/timer.h>
25#include <linux/timerqueue.h>
26
27struct hrtimer_clock_base;
28struct hrtimer_cpu_base;
29
30
31
32
33enum hrtimer_mode {
34 HRTIMER_MODE_ABS = 0x0,
35 HRTIMER_MODE_REL = 0x1,
36 HRTIMER_MODE_PINNED = 0x02,
37 HRTIMER_MODE_ABS_PINNED = 0x02,
38 HRTIMER_MODE_REL_PINNED = 0x03,
39};
40
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42
43
44enum hrtimer_restart {
45 HRTIMER_NORESTART,
46 HRTIMER_RESTART,
47};
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75#define HRTIMER_STATE_INACTIVE 0x00
76#define HRTIMER_STATE_ENQUEUED 0x01
77#define HRTIMER_STATE_CALLBACK 0x02
78#define HRTIMER_STATE_MIGRATE 0x04
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103struct hrtimer {
104 struct timerqueue_node node;
105 ktime_t _softexpires;
106 enum hrtimer_restart (*function)(struct hrtimer *);
107 struct hrtimer_clock_base *base;
108 unsigned long state;
109#ifdef CONFIG_TIMER_STATS
110 int start_pid;
111 void *start_site;
112 char start_comm[16];
113#endif
114};
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122
123struct hrtimer_sleeper {
124 struct hrtimer timer;
125 struct task_struct *task;
126};
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139struct hrtimer_clock_base {
140 struct hrtimer_cpu_base *cpu_base;
141 clockid_t index;
142 struct timerqueue_head active;
143 ktime_t resolution;
144 ktime_t (*get_time)(void);
145 ktime_t softirq_time;
146#ifdef CONFIG_HIGH_RES_TIMERS
147 ktime_t offset;
148#endif
149};
150
151#define HRTIMER_MAX_CLOCK_BASES 2
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166
167struct hrtimer_cpu_base {
168 raw_spinlock_t lock;
169 struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES];
170#ifdef CONFIG_HIGH_RES_TIMERS
171 ktime_t expires_next;
172 int hres_active;
173 int hang_detected;
174 unsigned long nr_events;
175 unsigned long nr_retries;
176 unsigned long nr_hangs;
177 ktime_t max_hang_time;
178#endif
179};
180
181static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time)
182{
183 timer->node.expires = time;
184 timer->_softexpires = time;
185}
186
187static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta)
188{
189 timer->_softexpires = time;
190 timer->node.expires = ktime_add_safe(time, delta);
191}
192
193static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, unsigned long delta)
194{
195 timer->_softexpires = time;
196 timer->node.expires = ktime_add_safe(time, ns_to_ktime(delta));
197}
198
199static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64)
200{
201 timer->node.expires.tv64 = tv64;
202 timer->_softexpires.tv64 = tv64;
203}
204
205static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time)
206{
207 timer->node.expires = ktime_add_safe(timer->node.expires, time);
208 timer->_softexpires = ktime_add_safe(timer->_softexpires, time);
209}
210
211static inline void hrtimer_add_expires_ns(struct hrtimer *timer, u64 ns)
212{
213 timer->node.expires = ktime_add_ns(timer->node.expires, ns);
214 timer->_softexpires = ktime_add_ns(timer->_softexpires, ns);
215}
216
217static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer)
218{
219 return timer->node.expires;
220}
221
222static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer)
223{
224 return timer->_softexpires;
225}
226
227static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer)
228{
229 return timer->node.expires.tv64;
230}
231static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer)
232{
233 return timer->_softexpires.tv64;
234}
235
236static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer)
237{
238 return ktime_to_ns(timer->node.expires);
239}
240
241static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer)
242{
243 return ktime_sub(timer->node.expires, timer->base->get_time());
244}
245
246#ifdef CONFIG_HIGH_RES_TIMERS
247struct clock_event_device;
248
249extern void clock_was_set(void);
250extern void hres_timers_resume(void);
251extern void hrtimer_interrupt(struct clock_event_device *dev);
252
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255
256static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
257{
258 return timer->base->get_time();
259}
260
261static inline int hrtimer_is_hres_active(struct hrtimer *timer)
262{
263 return timer->base->cpu_base->hres_active;
264}
265
266extern void hrtimer_peek_ahead_timers(void);
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274# define HIGH_RES_NSEC 1
275# define KTIME_HIGH_RES (ktime_t) { .tv64 = HIGH_RES_NSEC }
276# define MONOTONIC_RES_NSEC HIGH_RES_NSEC
277# define KTIME_MONOTONIC_RES KTIME_HIGH_RES
278
279#else
280
281# define MONOTONIC_RES_NSEC LOW_RES_NSEC
282# define KTIME_MONOTONIC_RES KTIME_LOW_RES
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289static inline void clock_was_set(void) { }
290static inline void hrtimer_peek_ahead_timers(void) { }
291
292static inline void hres_timers_resume(void) { }
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298static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
299{
300 return timer->base->softirq_time;
301}
302
303static inline int hrtimer_is_hres_active(struct hrtimer *timer)
304{
305 return 0;
306}
307#endif
308
309extern ktime_t ktime_get(void);
310extern ktime_t ktime_get_real(void);
311
312
313DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
314
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319extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock,
320 enum hrtimer_mode mode);
321
322#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
323extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock,
324 enum hrtimer_mode mode);
325
326extern void destroy_hrtimer_on_stack(struct hrtimer *timer);
327#else
328static inline void hrtimer_init_on_stack(struct hrtimer *timer,
329 clockid_t which_clock,
330 enum hrtimer_mode mode)
331{
332 hrtimer_init(timer, which_clock, mode);
333}
334static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { }
335#endif
336
337
338extern int hrtimer_start(struct hrtimer *timer, ktime_t tim,
339 const enum hrtimer_mode mode);
340extern int hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
341 unsigned long range_ns, const enum hrtimer_mode mode);
342extern int
343__hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
344 unsigned long delta_ns,
345 const enum hrtimer_mode mode, int wakeup);
346
347extern int hrtimer_cancel(struct hrtimer *timer);
348extern int hrtimer_try_to_cancel(struct hrtimer *timer);
349
350static inline int hrtimer_start_expires(struct hrtimer *timer,
351 enum hrtimer_mode mode)
352{
353 unsigned long delta;
354 ktime_t soft, hard;
355 soft = hrtimer_get_softexpires(timer);
356 hard = hrtimer_get_expires(timer);
357 delta = ktime_to_ns(ktime_sub(hard, soft));
358 return hrtimer_start_range_ns(timer, soft, delta, mode);
359}
360
361static inline int hrtimer_restart(struct hrtimer *timer)
362{
363 return hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
364}
365
366
367extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer);
368extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp);
369
370extern ktime_t hrtimer_get_next_event(void);
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376static inline int hrtimer_active(const struct hrtimer *timer)
377{
378 return timer->state != HRTIMER_STATE_INACTIVE;
379}
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384static inline int hrtimer_is_queued(struct hrtimer *timer)
385{
386 return timer->state & HRTIMER_STATE_ENQUEUED;
387}
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393static inline int hrtimer_callback_running(struct hrtimer *timer)
394{
395 return timer->state & HRTIMER_STATE_CALLBACK;
396}
397
398
399extern u64
400hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval);
401
402
403static inline u64 hrtimer_forward_now(struct hrtimer *timer,
404 ktime_t interval)
405{
406 return hrtimer_forward(timer, timer->base->get_time(), interval);
407}
408
409
410extern long hrtimer_nanosleep(struct timespec *rqtp,
411 struct timespec __user *rmtp,
412 const enum hrtimer_mode mode,
413 const clockid_t clockid);
414extern long hrtimer_nanosleep_restart(struct restart_block *restart_block);
415
416extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
417 struct task_struct *tsk);
418
419extern int schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
420 const enum hrtimer_mode mode);
421extern int schedule_hrtimeout_range_clock(ktime_t *expires,
422 unsigned long delta, const enum hrtimer_mode mode, int clock);
423extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode);
424
425
426extern void hrtimer_run_queues(void);
427extern void hrtimer_run_pending(void);
428
429
430extern void __init hrtimers_init(void);
431
432#if BITS_PER_LONG < 64
433extern u64 ktime_divns(const ktime_t kt, s64 div);
434#else
435# define ktime_divns(kt, div) (u64)((kt).tv64 / (div))
436#endif
437
438
439extern void sysrq_timer_list_show(void);
440
441#endif
442