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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
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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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43
44enum hrtimer_restart {
45 HRTIMER_NORESTART,
46 HRTIMER_RESTART,
47};
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80#define HRTIMER_STATE_INACTIVE 0x00
81#define HRTIMER_STATE_ENQUEUED 0x01
82#define HRTIMER_STATE_CALLBACK 0x02
83#define HRTIMER_STATE_MIGRATE 0x04
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108struct hrtimer {
109 struct timerqueue_node node;
110 ktime_t _softexpires;
111 enum hrtimer_restart (*function)(struct hrtimer *);
112 struct hrtimer_clock_base *base;
113 unsigned long state;
114#ifdef CONFIG_TIMER_STATS
115 int start_pid;
116 void *start_site;
117 char start_comm[16];
118#endif
119};
120
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127
128struct hrtimer_sleeper {
129 struct hrtimer timer;
130 struct task_struct *task;
131};
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143
144struct hrtimer_clock_base {
145 struct hrtimer_cpu_base *cpu_base;
146 int index;
147 clockid_t clockid;
148 struct timerqueue_head active;
149 ktime_t resolution;
150 ktime_t (*get_time)(void);
151 RH_KABI_DEPRECATE(ktime_t, softirq_time)
152 ktime_t offset;
153};
154
155enum hrtimer_base_type {
156 HRTIMER_BASE_MONOTONIC,
157 HRTIMER_BASE_REALTIME,
158 HRTIMER_BASE_BOOTTIME,
159 HRTIMER_BASE_TAI,
160 HRTIMER_MAX_CLOCK_BASES,
161};
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183struct hrtimer_cpu_base {
184 raw_spinlock_t lock;
185 unsigned int active_bases;
186 unsigned int clock_was_set;
187#ifdef CONFIG_HIGH_RES_TIMERS
188 ktime_t expires_next;
189 int hres_active;
190 int hang_detected;
191 unsigned long nr_events;
192 unsigned long nr_retries;
193 unsigned long nr_hangs;
194 ktime_t max_hang_time;
195#endif
196 struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES];
197 RH_KABI_EXTEND(int cpu)
198 RH_KABI_EXTEND(int in_hrtirq)
199};
200
201static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time)
202{
203 timer->node.expires = time;
204 timer->_softexpires = time;
205}
206
207static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta)
208{
209 timer->_softexpires = time;
210 timer->node.expires = ktime_add_safe(time, delta);
211}
212
213static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, unsigned long delta)
214{
215 timer->_softexpires = time;
216 timer->node.expires = ktime_add_safe(time, ns_to_ktime(delta));
217}
218
219static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64)
220{
221 timer->node.expires.tv64 = tv64;
222 timer->_softexpires.tv64 = tv64;
223}
224
225static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time)
226{
227 timer->node.expires = ktime_add_safe(timer->node.expires, time);
228 timer->_softexpires = ktime_add_safe(timer->_softexpires, time);
229}
230
231static inline void hrtimer_add_expires_ns(struct hrtimer *timer, u64 ns)
232{
233 timer->node.expires = ktime_add_ns(timer->node.expires, ns);
234 timer->_softexpires = ktime_add_ns(timer->_softexpires, ns);
235}
236
237static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer)
238{
239 return timer->node.expires;
240}
241
242static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer)
243{
244 return timer->_softexpires;
245}
246
247static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer)
248{
249 return timer->node.expires.tv64;
250}
251static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer)
252{
253 return timer->_softexpires.tv64;
254}
255
256static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer)
257{
258 return ktime_to_ns(timer->node.expires);
259}
260
261static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer)
262{
263 return ktime_sub(timer->node.expires, timer->base->get_time());
264}
265
266static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
267{
268 return timer->base->get_time();
269}
270
271#ifdef CONFIG_HIGH_RES_TIMERS
272struct clock_event_device;
273
274extern void hrtimer_interrupt(struct clock_event_device *dev);
275
276static inline int hrtimer_is_hres_active(struct hrtimer *timer)
277{
278 return timer->base->cpu_base->hres_active;
279}
280
281extern void hrtimer_peek_ahead_timers(void);
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288
289# define HIGH_RES_NSEC 1
290# define KTIME_HIGH_RES (ktime_t) { .tv64 = HIGH_RES_NSEC }
291# define MONOTONIC_RES_NSEC HIGH_RES_NSEC
292# define KTIME_MONOTONIC_RES KTIME_HIGH_RES
293
294extern void clock_was_set_delayed(void);
295
296#else
297
298# define MONOTONIC_RES_NSEC LOW_RES_NSEC
299# define KTIME_MONOTONIC_RES KTIME_LOW_RES
300
301static inline void hrtimer_peek_ahead_timers(void) { }
302
303static inline int hrtimer_is_hres_active(struct hrtimer *timer)
304{
305 return 0;
306}
307
308static inline void clock_was_set_delayed(void) { }
309
310#endif
311
312extern void clock_was_set(void);
313#ifdef CONFIG_TIMERFD
314extern void timerfd_clock_was_set(void);
315#else
316static inline void timerfd_clock_was_set(void) { }
317#endif
318extern void hrtimers_resume(void);
319
320DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
321
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326extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock,
327 enum hrtimer_mode mode);
328
329#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
330extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock,
331 enum hrtimer_mode mode);
332
333extern void destroy_hrtimer_on_stack(struct hrtimer *timer);
334#else
335static inline void hrtimer_init_on_stack(struct hrtimer *timer,
336 clockid_t which_clock,
337 enum hrtimer_mode mode)
338{
339 hrtimer_init(timer, which_clock, mode);
340}
341static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { }
342#endif
343
344
345extern int hrtimer_start(struct hrtimer *timer, ktime_t tim,
346 const enum hrtimer_mode mode);
347extern int hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
348 unsigned long range_ns, const enum hrtimer_mode mode);
349extern int hrtimer_cancel(struct hrtimer *timer);
350extern int hrtimer_try_to_cancel(struct hrtimer *timer);
351
352static inline void hrtimer_start_expires(struct hrtimer *timer,
353 enum hrtimer_mode mode)
354{
355 unsigned long delta;
356 ktime_t soft, hard;
357 soft = hrtimer_get_softexpires(timer);
358 hard = hrtimer_get_expires(timer);
359 delta = ktime_to_ns(ktime_sub(hard, soft));
360 hrtimer_start_range_ns(timer, soft, delta, mode);
361}
362
363static inline void hrtimer_restart(struct hrtimer *timer)
364{
365 hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
366}
367
368
369extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer);
370extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp);
371
372extern u64 hrtimer_get_next_event(void);
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379static inline int hrtimer_active(const struct hrtimer *timer)
380{
381 return timer->state != HRTIMER_STATE_INACTIVE;
382}
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387static inline int hrtimer_is_queued(struct hrtimer *timer)
388{
389 return timer->state & HRTIMER_STATE_ENQUEUED;
390}
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396static inline int hrtimer_callback_running(struct hrtimer *timer)
397{
398 return timer->state & HRTIMER_STATE_CALLBACK;
399}
400
401
402extern u64
403hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval);
404
405
406static inline u64 hrtimer_forward_now(struct hrtimer *timer,
407 ktime_t interval)
408{
409 return hrtimer_forward(timer, timer->base->get_time(), interval);
410}
411
412
413extern long hrtimer_nanosleep(struct timespec *rqtp,
414 struct timespec __user *rmtp,
415 const enum hrtimer_mode mode,
416 const clockid_t clockid);
417extern long hrtimer_nanosleep_restart(struct restart_block *restart_block);
418
419extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
420 struct task_struct *tsk);
421
422extern int schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
423 const enum hrtimer_mode mode);
424extern int schedule_hrtimeout_range_clock(ktime_t *expires,
425 unsigned long delta, const enum hrtimer_mode mode, int clock);
426extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode);
427
428
429extern void hrtimer_run_queues(void);
430
431
432extern void __init hrtimers_init(void);
433
434#if BITS_PER_LONG < 64
435extern u64 ktime_divns(const ktime_t kt, s64 div);
436#else
437# define ktime_divns(kt, div) (u64)((kt).tv64 / (div))
438#endif
439
440
441extern void sysrq_timer_list_show(void);
442
443#endif
444