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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;
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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};
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43
44enum hrtimer_restart {
45 HRTIMER_NORESTART,
46 HRTIMER_RESTART,
47};
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73#define HRTIMER_STATE_INACTIVE 0x00
74#define HRTIMER_STATE_ENQUEUED 0x01
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100struct hrtimer {
101 struct timerqueue_node node;
102 ktime_t _softexpires;
103 enum hrtimer_restart (*function)(struct hrtimer *);
104 struct hrtimer_clock_base *base;
105 u8 state;
106 u8 is_rel;
107#ifdef CONFIG_TIMER_STATS
108 int start_pid;
109 void *start_site;
110 char start_comm[16];
111#endif
112};
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120
121struct hrtimer_sleeper {
122 struct hrtimer timer;
123 struct task_struct *task;
124};
125
126#ifdef CONFIG_64BIT
127# define HRTIMER_CLOCK_BASE_ALIGN 64
128#else
129# define HRTIMER_CLOCK_BASE_ALIGN 32
130#endif
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141
142struct hrtimer_clock_base {
143 struct hrtimer_cpu_base *cpu_base;
144 int index;
145 clockid_t clockid;
146 struct timerqueue_head active;
147 ktime_t (*get_time)(void);
148 ktime_t offset;
149} __attribute__((__aligned__(HRTIMER_CLOCK_BASE_ALIGN)));
150
151enum hrtimer_base_type {
152 HRTIMER_BASE_MONOTONIC,
153 HRTIMER_BASE_REALTIME,
154 HRTIMER_BASE_BOOTTIME,
155 HRTIMER_BASE_TAI,
156 HRTIMER_MAX_CLOCK_BASES,
157};
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186struct hrtimer_cpu_base {
187 raw_spinlock_t lock;
188 seqcount_t seq;
189 struct hrtimer *running;
190 unsigned int cpu;
191 unsigned int active_bases;
192 unsigned int clock_was_set_seq;
193 bool migration_enabled;
194 bool nohz_active;
195#ifdef CONFIG_HIGH_RES_TIMERS
196 unsigned int in_hrtirq : 1,
197 hres_active : 1,
198 hang_detected : 1;
199 ktime_t expires_next;
200 struct hrtimer *next_timer;
201 unsigned int nr_events;
202 unsigned int nr_retries;
203 unsigned int nr_hangs;
204 unsigned int max_hang_time;
205#endif
206 struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES];
207} ____cacheline_aligned;
208
209static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time)
210{
211 BUILD_BUG_ON(sizeof(struct hrtimer_clock_base) > HRTIMER_CLOCK_BASE_ALIGN);
212
213 timer->node.expires = time;
214 timer->_softexpires = time;
215}
216
217static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta)
218{
219 timer->_softexpires = time;
220 timer->node.expires = ktime_add_safe(time, delta);
221}
222
223static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, u64 delta)
224{
225 timer->_softexpires = time;
226 timer->node.expires = ktime_add_safe(time, ns_to_ktime(delta));
227}
228
229static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64)
230{
231 timer->node.expires.tv64 = tv64;
232 timer->_softexpires.tv64 = tv64;
233}
234
235static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time)
236{
237 timer->node.expires = ktime_add_safe(timer->node.expires, time);
238 timer->_softexpires = ktime_add_safe(timer->_softexpires, time);
239}
240
241static inline void hrtimer_add_expires_ns(struct hrtimer *timer, u64 ns)
242{
243 timer->node.expires = ktime_add_ns(timer->node.expires, ns);
244 timer->_softexpires = ktime_add_ns(timer->_softexpires, ns);
245}
246
247static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer)
248{
249 return timer->node.expires;
250}
251
252static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer)
253{
254 return timer->_softexpires;
255}
256
257static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer)
258{
259 return timer->node.expires.tv64;
260}
261static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer)
262{
263 return timer->_softexpires.tv64;
264}
265
266static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer)
267{
268 return ktime_to_ns(timer->node.expires);
269}
270
271static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer)
272{
273 return ktime_sub(timer->node.expires, timer->base->get_time());
274}
275
276static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
277{
278 return timer->base->get_time();
279}
280
281#ifdef CONFIG_HIGH_RES_TIMERS
282struct clock_event_device;
283
284extern void hrtimer_interrupt(struct clock_event_device *dev);
285
286static inline int hrtimer_is_hres_active(struct hrtimer *timer)
287{
288 return timer->base->cpu_base->hres_active;
289}
290
291extern void hrtimer_peek_ahead_timers(void);
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299# define HIGH_RES_NSEC 1
300# define KTIME_HIGH_RES (ktime_t) { .tv64 = HIGH_RES_NSEC }
301# define MONOTONIC_RES_NSEC HIGH_RES_NSEC
302# define KTIME_MONOTONIC_RES KTIME_HIGH_RES
303
304extern void clock_was_set_delayed(void);
305
306extern unsigned int hrtimer_resolution;
307
308#else
309
310# define MONOTONIC_RES_NSEC LOW_RES_NSEC
311# define KTIME_MONOTONIC_RES KTIME_LOW_RES
312
313#define hrtimer_resolution (unsigned int)LOW_RES_NSEC
314
315static inline void hrtimer_peek_ahead_timers(void) { }
316
317static inline int hrtimer_is_hres_active(struct hrtimer *timer)
318{
319 return 0;
320}
321
322static inline void clock_was_set_delayed(void) { }
323
324#endif
325
326static inline ktime_t
327__hrtimer_expires_remaining_adjusted(const struct hrtimer *timer, ktime_t now)
328{
329 ktime_t rem = ktime_sub(timer->node.expires, now);
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335 if (IS_ENABLED(CONFIG_TIME_LOW_RES) && timer->is_rel)
336 rem.tv64 -= hrtimer_resolution;
337 return rem;
338}
339
340static inline ktime_t
341hrtimer_expires_remaining_adjusted(const struct hrtimer *timer)
342{
343 return __hrtimer_expires_remaining_adjusted(timer,
344 timer->base->get_time());
345}
346
347extern void clock_was_set(void);
348#ifdef CONFIG_TIMERFD
349extern void timerfd_clock_was_set(void);
350#else
351static inline void timerfd_clock_was_set(void) { }
352#endif
353extern void hrtimers_resume(void);
354
355DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
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361extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock,
362 enum hrtimer_mode mode);
363
364#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
365extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock,
366 enum hrtimer_mode mode);
367
368extern void destroy_hrtimer_on_stack(struct hrtimer *timer);
369#else
370static inline void hrtimer_init_on_stack(struct hrtimer *timer,
371 clockid_t which_clock,
372 enum hrtimer_mode mode)
373{
374 hrtimer_init(timer, which_clock, mode);
375}
376static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { }
377#endif
378
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380extern void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
381 u64 range_ns, const enum hrtimer_mode mode);
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390static inline void hrtimer_start(struct hrtimer *timer, ktime_t tim,
391 const enum hrtimer_mode mode)
392{
393 hrtimer_start_range_ns(timer, tim, 0, mode);
394}
395
396extern int hrtimer_cancel(struct hrtimer *timer);
397extern int hrtimer_try_to_cancel(struct hrtimer *timer);
398
399static inline void hrtimer_start_expires(struct hrtimer *timer,
400 enum hrtimer_mode mode)
401{
402 u64 delta;
403 ktime_t soft, hard;
404 soft = hrtimer_get_softexpires(timer);
405 hard = hrtimer_get_expires(timer);
406 delta = ktime_to_ns(ktime_sub(hard, soft));
407 hrtimer_start_range_ns(timer, soft, delta, mode);
408}
409
410static inline void hrtimer_restart(struct hrtimer *timer)
411{
412 hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
413}
414
415
416extern ktime_t __hrtimer_get_remaining(const struct hrtimer *timer, bool adjust);
417
418static inline ktime_t hrtimer_get_remaining(const struct hrtimer *timer)
419{
420 return __hrtimer_get_remaining(timer, false);
421}
422
423extern u64 hrtimer_get_next_event(void);
424
425extern bool hrtimer_active(const struct hrtimer *timer);
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430static inline int hrtimer_is_queued(struct hrtimer *timer)
431{
432 return timer->state & HRTIMER_STATE_ENQUEUED;
433}
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439static inline int hrtimer_callback_running(struct hrtimer *timer)
440{
441 return timer->base->cpu_base->running == timer;
442}
443
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445extern u64
446hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval);
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464static inline u64 hrtimer_forward_now(struct hrtimer *timer,
465 ktime_t interval)
466{
467 return hrtimer_forward(timer, timer->base->get_time(), interval);
468}
469
470
471extern long hrtimer_nanosleep(struct timespec *rqtp,
472 struct timespec __user *rmtp,
473 const enum hrtimer_mode mode,
474 const clockid_t clockid);
475extern long hrtimer_nanosleep_restart(struct restart_block *restart_block);
476
477extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
478 struct task_struct *tsk);
479
480extern int schedule_hrtimeout_range(ktime_t *expires, u64 delta,
481 const enum hrtimer_mode mode);
482extern int schedule_hrtimeout_range_clock(ktime_t *expires,
483 u64 delta,
484 const enum hrtimer_mode mode,
485 int clock);
486extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode);
487
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489extern void hrtimer_run_queues(void);
490
491
492extern void __init hrtimers_init(void);
493
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495extern void sysrq_timer_list_show(void);
496
497int hrtimers_prepare_cpu(unsigned int cpu);
498#ifdef CONFIG_HOTPLUG_CPU
499int hrtimers_dead_cpu(unsigned int cpu);
500#else
501#define hrtimers_dead_cpu NULL
502#endif
503
504#endif
505