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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
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 rb_node node;
105 ktime_t _expires;
106 ktime_t _softexpires;
107 enum hrtimer_restart (*function)(struct hrtimer *);
108 struct hrtimer_clock_base *base;
109 unsigned long state;
110#ifdef CONFIG_TIMER_STATS
111 int start_pid;
112 void *start_site;
113 char start_comm[16];
114#endif
115};
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123
124struct hrtimer_sleeper {
125 struct hrtimer timer;
126 struct task_struct *task;
127};
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140
141struct hrtimer_clock_base {
142 struct hrtimer_cpu_base *cpu_base;
143 clockid_t index;
144 struct rb_root active;
145 struct rb_node *first;
146 ktime_t resolution;
147 ktime_t (*get_time)(void);
148 ktime_t softirq_time;
149#ifdef CONFIG_HIGH_RES_TIMERS
150 ktime_t offset;
151#endif
152};
153
154#define HRTIMER_MAX_CLOCK_BASES 2
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170struct hrtimer_cpu_base {
171 spinlock_t lock;
172 struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES];
173#ifdef CONFIG_HIGH_RES_TIMERS
174 ktime_t expires_next;
175 int hres_active;
176 unsigned long nr_events;
177#endif
178};
179
180static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time)
181{
182 timer->_expires = time;
183 timer->_softexpires = time;
184}
185
186static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta)
187{
188 timer->_softexpires = time;
189 timer->_expires = ktime_add_safe(time, delta);
190}
191
192static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, unsigned long delta)
193{
194 timer->_softexpires = time;
195 timer->_expires = ktime_add_safe(time, ns_to_ktime(delta));
196}
197
198static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64)
199{
200 timer->_expires.tv64 = tv64;
201 timer->_softexpires.tv64 = tv64;
202}
203
204static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time)
205{
206 timer->_expires = ktime_add_safe(timer->_expires, time);
207 timer->_softexpires = ktime_add_safe(timer->_softexpires, time);
208}
209
210static inline void hrtimer_add_expires_ns(struct hrtimer *timer, u64 ns)
211{
212 timer->_expires = ktime_add_ns(timer->_expires, ns);
213 timer->_softexpires = ktime_add_ns(timer->_softexpires, ns);
214}
215
216static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer)
217{
218 return timer->_expires;
219}
220
221static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer)
222{
223 return timer->_softexpires;
224}
225
226static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer)
227{
228 return timer->_expires.tv64;
229}
230static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer)
231{
232 return timer->_softexpires.tv64;
233}
234
235static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer)
236{
237 return ktime_to_ns(timer->_expires);
238}
239
240static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer)
241{
242 return ktime_sub(timer->_expires, timer->base->get_time());
243}
244
245#ifdef CONFIG_HIGH_RES_TIMERS
246struct clock_event_device;
247
248extern void clock_was_set(void);
249extern void hres_timers_resume(void);
250extern void hrtimer_interrupt(struct clock_event_device *dev);
251
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254
255static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
256{
257 return timer->base->get_time();
258}
259
260static inline int hrtimer_is_hres_active(struct hrtimer *timer)
261{
262 return timer->base->cpu_base->hres_active;
263}
264
265extern void hrtimer_peek_ahead_timers(void);
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273# define HIGH_RES_NSEC 1
274# define KTIME_HIGH_RES (ktime_t) { .tv64 = HIGH_RES_NSEC }
275# define MONOTONIC_RES_NSEC HIGH_RES_NSEC
276# define KTIME_MONOTONIC_RES KTIME_HIGH_RES
277
278#else
279
280# define MONOTONIC_RES_NSEC LOW_RES_NSEC
281# define KTIME_MONOTONIC_RES KTIME_LOW_RES
282
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287
288static inline void clock_was_set(void) { }
289static inline void hrtimer_peek_ahead_timers(void) { }
290
291static inline void hres_timers_resume(void) { }
292
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297static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
298{
299 return timer->base->softirq_time;
300}
301
302static inline int hrtimer_is_hres_active(struct hrtimer *timer)
303{
304 return 0;
305}
306#endif
307
308extern ktime_t ktime_get(void);
309extern ktime_t ktime_get_real(void);
310
311
312DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
313
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318extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock,
319 enum hrtimer_mode mode);
320
321#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
322extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock,
323 enum hrtimer_mode mode);
324
325extern void destroy_hrtimer_on_stack(struct hrtimer *timer);
326#else
327static inline void hrtimer_init_on_stack(struct hrtimer *timer,
328 clockid_t which_clock,
329 enum hrtimer_mode mode)
330{
331 hrtimer_init(timer, which_clock, mode);
332}
333static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { }
334#endif
335
336
337extern int hrtimer_start(struct hrtimer *timer, ktime_t tim,
338 const enum hrtimer_mode mode);
339extern int hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
340 unsigned long range_ns, const enum hrtimer_mode mode);
341extern int
342__hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
343 unsigned long delta_ns,
344 const enum hrtimer_mode mode, int wakeup);
345
346extern int hrtimer_cancel(struct hrtimer *timer);
347extern int hrtimer_try_to_cancel(struct hrtimer *timer);
348
349static inline int hrtimer_start_expires(struct hrtimer *timer,
350 enum hrtimer_mode mode)
351{
352 unsigned long delta;
353 ktime_t soft, hard;
354 soft = hrtimer_get_softexpires(timer);
355 hard = hrtimer_get_expires(timer);
356 delta = ktime_to_ns(ktime_sub(hard, soft));
357 return hrtimer_start_range_ns(timer, soft, delta, mode);
358}
359
360static inline int hrtimer_restart(struct hrtimer *timer)
361{
362 return hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
363}
364
365
366extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer);
367extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp);
368
369extern ktime_t hrtimer_get_next_event(void);
370
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375static inline int hrtimer_active(const struct hrtimer *timer)
376{
377 return timer->state != HRTIMER_STATE_INACTIVE;
378}
379
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383static inline int hrtimer_is_queued(struct hrtimer *timer)
384{
385 return timer->state & HRTIMER_STATE_ENQUEUED;
386}
387
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391
392static inline int hrtimer_callback_running(struct hrtimer *timer)
393{
394 return timer->state & HRTIMER_STATE_CALLBACK;
395}
396
397
398extern u64
399hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval);
400
401
402static inline u64 hrtimer_forward_now(struct hrtimer *timer,
403 ktime_t interval)
404{
405 return hrtimer_forward(timer, timer->base->get_time(), interval);
406}
407
408
409extern long hrtimer_nanosleep(struct timespec *rqtp,
410 struct timespec __user *rmtp,
411 const enum hrtimer_mode mode,
412 const clockid_t clockid);
413extern long hrtimer_nanosleep_restart(struct restart_block *restart_block);
414
415extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
416 struct task_struct *tsk);
417
418extern int schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
419 const enum hrtimer_mode mode);
420extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode);
421
422
423extern void hrtimer_run_queues(void);
424extern void hrtimer_run_pending(void);
425
426
427extern void __init hrtimers_init(void);
428
429#if BITS_PER_LONG < 64
430extern u64 ktime_divns(const ktime_t kt, s64 div);
431#else
432# define ktime_divns(kt, div) (u64)((kt).tv64 / (div))
433#endif
434
435
436extern void sysrq_timer_list_show(void);
437
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439
440
441#ifdef CONFIG_TIMER_STATS
442
443extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
444 void *timerf, char *comm,
445 unsigned int timer_flag);
446
447static inline void timer_stats_account_hrtimer(struct hrtimer *timer)
448{
449 if (likely(!timer->start_site))
450 return;
451 timer_stats_update_stats(timer, timer->start_pid, timer->start_site,
452 timer->function, timer->start_comm, 0);
453}
454
455extern void __timer_stats_hrtimer_set_start_info(struct hrtimer *timer,
456 void *addr);
457
458static inline void timer_stats_hrtimer_set_start_info(struct hrtimer *timer)
459{
460 if (likely(!timer_stats_active))
461 return;
462 __timer_stats_hrtimer_set_start_info(timer, __builtin_return_address(0));
463}
464
465static inline void timer_stats_hrtimer_clear_start_info(struct hrtimer *timer)
466{
467 timer->start_site = NULL;
468}
469#else
470static inline void timer_stats_account_hrtimer(struct hrtimer *timer)
471{
472}
473
474static inline void timer_stats_hrtimer_set_start_info(struct hrtimer *timer)
475{
476}
477
478static inline void timer_stats_hrtimer_clear_start_info(struct hrtimer *timer)
479{
480}
481#endif
482
483#endif
484