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35728b82 | 1 | // SPDX-License-Identifier: GPL-2.0 |
c0a31329 | 2 | /* |
c0a31329 TG |
3 | * hrtimers - High-resolution kernel timers |
4 | * | |
5 | * Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de> | |
6 | * Copyright(C) 2005, Red Hat, Inc., Ingo Molnar | |
7 | * | |
8 | * data type definitions, declarations, prototypes | |
9 | * | |
10 | * Started by: Thomas Gleixner and Ingo Molnar | |
c0a31329 TG |
11 | */ |
12 | #ifndef _LINUX_HRTIMER_H | |
13 | #define _LINUX_HRTIMER_H | |
14 | ||
32e29396 | 15 | #include <linux/hrtimer_defs.h> |
c0a31329 | 16 | #include <linux/rbtree.h> |
c0a31329 TG |
17 | #include <linux/init.h> |
18 | #include <linux/list.h> | |
40b86062 | 19 | #include <linux/percpu.h> |
0cd39f46 | 20 | #include <linux/seqlock.h> |
507e1231 | 21 | #include <linux/timer.h> |
998adc3d | 22 | #include <linux/timerqueue.h> |
c0a31329 | 23 | |
3c8aa39d TG |
24 | struct hrtimer_clock_base; |
25 | struct hrtimer_cpu_base; | |
26 | ||
c0a31329 TG |
27 | /* |
28 | * Mode arguments of xxx_hrtimer functions: | |
19b51cb5 AMG |
29 | * |
30 | * HRTIMER_MODE_ABS - Time value is absolute | |
31 | * HRTIMER_MODE_REL - Time value is relative to now | |
32 | * HRTIMER_MODE_PINNED - Timer is bound to CPU (is only considered | |
33 | * when starting the timer) | |
98ecadd4 AMG |
34 | * HRTIMER_MODE_SOFT - Timer callback function will be executed in |
35 | * soft irq context | |
a67e4082 SAS |
36 | * HRTIMER_MODE_HARD - Timer callback function will be executed in |
37 | * hard irq context even on PREEMPT_RT. | |
c0a31329 TG |
38 | */ |
39 | enum hrtimer_mode { | |
19b51cb5 AMG |
40 | HRTIMER_MODE_ABS = 0x00, |
41 | HRTIMER_MODE_REL = 0x01, | |
42 | HRTIMER_MODE_PINNED = 0x02, | |
98ecadd4 | 43 | HRTIMER_MODE_SOFT = 0x04, |
ae6683d8 | 44 | HRTIMER_MODE_HARD = 0x08, |
19b51cb5 AMG |
45 | |
46 | HRTIMER_MODE_ABS_PINNED = HRTIMER_MODE_ABS | HRTIMER_MODE_PINNED, | |
47 | HRTIMER_MODE_REL_PINNED = HRTIMER_MODE_REL | HRTIMER_MODE_PINNED, | |
98ecadd4 AMG |
48 | |
49 | HRTIMER_MODE_ABS_SOFT = HRTIMER_MODE_ABS | HRTIMER_MODE_SOFT, | |
50 | HRTIMER_MODE_REL_SOFT = HRTIMER_MODE_REL | HRTIMER_MODE_SOFT, | |
51 | ||
52 | HRTIMER_MODE_ABS_PINNED_SOFT = HRTIMER_MODE_ABS_PINNED | HRTIMER_MODE_SOFT, | |
53 | HRTIMER_MODE_REL_PINNED_SOFT = HRTIMER_MODE_REL_PINNED | HRTIMER_MODE_SOFT, | |
54 | ||
ae6683d8 SAS |
55 | HRTIMER_MODE_ABS_HARD = HRTIMER_MODE_ABS | HRTIMER_MODE_HARD, |
56 | HRTIMER_MODE_REL_HARD = HRTIMER_MODE_REL | HRTIMER_MODE_HARD, | |
57 | ||
58 | HRTIMER_MODE_ABS_PINNED_HARD = HRTIMER_MODE_ABS_PINNED | HRTIMER_MODE_HARD, | |
59 | HRTIMER_MODE_REL_PINNED_HARD = HRTIMER_MODE_REL_PINNED | HRTIMER_MODE_HARD, | |
c0a31329 TG |
60 | }; |
61 | ||
c9cb2e3d TG |
62 | /* |
63 | * Return values for the callback function | |
64 | */ | |
c0a31329 | 65 | enum hrtimer_restart { |
c9cb2e3d TG |
66 | HRTIMER_NORESTART, /* Timer is not restarted */ |
67 | HRTIMER_RESTART, /* Timer must be restarted */ | |
c0a31329 TG |
68 | }; |
69 | ||
54cdfdb4 TG |
70 | /* |
71 | * Values to track state of the timer | |
303e967f TG |
72 | * |
73 | * Possible states: | |
74 | * | |
75 | * 0x00 inactive | |
76 | * 0x01 enqueued into rbtree | |
54cdfdb4 | 77 | * |
887d9dc9 PZ |
78 | * The callback state is not part of the timer->state because clearing it would |
79 | * mean touching the timer after the callback, this makes it impossible to free | |
80 | * the timer from the callback function. | |
53370d2e | 81 | * |
887d9dc9 PZ |
82 | * Therefore we track the callback state in: |
83 | * | |
84 | * timer->base->cpu_base->running == timer | |
85 | * | |
86 | * On SMP it is possible to have a "callback function running and enqueued" | |
87 | * status. It happens for example when a posix timer expired and the callback | |
303e967f TG |
88 | * queued a signal. Between dropping the lock which protects the posix timer |
89 | * and reacquiring the base lock of the hrtimer, another CPU can deliver the | |
887d9dc9 | 90 | * signal and rearm the timer. |
303e967f TG |
91 | * |
92 | * All state transitions are protected by cpu_base->lock. | |
93 | */ | |
94 | #define HRTIMER_STATE_INACTIVE 0x00 | |
95 | #define HRTIMER_STATE_ENQUEUED 0x01 | |
303e967f | 96 | |
c0a31329 TG |
97 | /** |
98 | * struct hrtimer - the basic hrtimer structure | |
998adc3d JS |
99 | * @node: timerqueue node, which also manages node.expires, |
100 | * the absolute expiry time in the hrtimers internal | |
c0a31329 | 101 | * representation. The time is related to the clock on |
592aa999 TG |
102 | * which the timer is based. Is setup by adding |
103 | * slack to the _softexpires value. For non range timers | |
104 | * identical to _softexpires. | |
105 | * @_softexpires: the absolute earliest expiry time of the hrtimer. | |
106 | * The time which was given as expiry time when the timer | |
107 | * was armed. | |
c0a31329 | 108 | * @function: timer expiry callback function |
c0a31329 | 109 | * @base: pointer to the timer base (per cpu and per clock) |
303e967f | 110 | * @state: state information (See bit values above) |
203cbf77 | 111 | * @is_rel: Set if the timer was armed relative |
5da70160 | 112 | * @is_soft: Set if hrtimer will be expired in soft interrupt context. |
0ab6a3dd TG |
113 | * @is_hard: Set if hrtimer will be expired in hard interrupt context |
114 | * even on RT. | |
c0a31329 | 115 | * |
54cdfdb4 | 116 | * The hrtimer structure must be initialized by hrtimer_init() |
c0a31329 TG |
117 | */ |
118 | struct hrtimer { | |
998adc3d | 119 | struct timerqueue_node node; |
654c8e0b | 120 | ktime_t _softexpires; |
3c8aa39d TG |
121 | enum hrtimer_restart (*function)(struct hrtimer *); |
122 | struct hrtimer_clock_base *base; | |
203cbf77 TG |
123 | u8 state; |
124 | u8 is_rel; | |
5da70160 | 125 | u8 is_soft; |
0ab6a3dd | 126 | u8 is_hard; |
c0a31329 TG |
127 | }; |
128 | ||
00362e33 TG |
129 | /** |
130 | * struct hrtimer_sleeper - simple sleeper structure | |
00362e33 TG |
131 | * @timer: embedded timer structure |
132 | * @task: task to wake up | |
133 | * | |
134 | * task is set to NULL, when the timer expires. | |
135 | */ | |
136 | struct hrtimer_sleeper { | |
137 | struct hrtimer timer; | |
138 | struct task_struct *task; | |
139 | }; | |
140 | ||
b8e38413 | 141 | #ifdef CONFIG_64BIT |
3f0b9e8e | 142 | # define __hrtimer_clock_base_align ____cacheline_aligned |
b8e38413 | 143 | #else |
3f0b9e8e | 144 | # define __hrtimer_clock_base_align |
b8e38413 TG |
145 | #endif |
146 | ||
c0a31329 | 147 | /** |
d1d67174 | 148 | * struct hrtimer_clock_base - the timer base for a specific clock |
05fb6bf0 | 149 | * @cpu_base: per cpu clock base |
3c8aa39d TG |
150 | * @index: clock type index for per_cpu support when moving a |
151 | * timer to a base on another cpu. | |
4d258b25 | 152 | * @clockid: clock id for per_cpu support |
3f0b9e8e AMG |
153 | * @seq: seqcount around __run_hrtimer |
154 | * @running: pointer to the currently running hrtimer | |
92127c7a | 155 | * @active: red black tree root node for the active timers |
92127c7a | 156 | * @get_time: function to retrieve the current time of the clock |
54cdfdb4 | 157 | * @offset: offset of this clock to the monotonic base |
c0a31329 | 158 | */ |
3c8aa39d TG |
159 | struct hrtimer_clock_base { |
160 | struct hrtimer_cpu_base *cpu_base; | |
3f0b9e8e | 161 | unsigned int index; |
ab8177bc | 162 | clockid_t clockid; |
af5a06b5 | 163 | seqcount_raw_spinlock_t seq; |
3f0b9e8e | 164 | struct hrtimer *running; |
998adc3d | 165 | struct timerqueue_head active; |
c0a31329 | 166 | ktime_t (*get_time)(void); |
54cdfdb4 | 167 | ktime_t offset; |
3f0b9e8e | 168 | } __hrtimer_clock_base_align; |
3c8aa39d | 169 | |
e06383db | 170 | enum hrtimer_base_type { |
e06383db | 171 | HRTIMER_BASE_MONOTONIC, |
68fa61c0 | 172 | HRTIMER_BASE_REALTIME, |
a3ed0e43 | 173 | HRTIMER_BASE_BOOTTIME, |
90adda98 | 174 | HRTIMER_BASE_TAI, |
98ecadd4 AMG |
175 | HRTIMER_BASE_MONOTONIC_SOFT, |
176 | HRTIMER_BASE_REALTIME_SOFT, | |
a3ed0e43 | 177 | HRTIMER_BASE_BOOTTIME_SOFT, |
98ecadd4 | 178 | HRTIMER_BASE_TAI_SOFT, |
e06383db JS |
179 | HRTIMER_MAX_CLOCK_BASES, |
180 | }; | |
3c8aa39d | 181 | |
1fbc78b3 | 182 | /** |
3c8aa39d TG |
183 | * struct hrtimer_cpu_base - the per cpu clock bases |
184 | * @lock: lock protecting the base and associated clock bases | |
185 | * and timers | |
cddd0248 | 186 | * @cpu: cpu number |
ab8177bc | 187 | * @active_bases: Bitfield to mark bases with active timers |
868a3e91 | 188 | * @clock_was_set_seq: Sequence counter of clock was set events |
54cdfdb4 | 189 | * @hres_active: State of high resolution mode |
28bfd18b | 190 | * @in_hrtirq: hrtimer_interrupt() is currently executing |
41d2e494 | 191 | * @hang_detected: The last hrtimer interrupt detected a hang |
5da70160 AMG |
192 | * @softirq_activated: displays, if the softirq is raised - update of softirq |
193 | * related settings is not required then. | |
41d2e494 TG |
194 | * @nr_events: Total number of hrtimer interrupt events |
195 | * @nr_retries: Total number of hrtimer interrupt retries | |
196 | * @nr_hangs: Total number of hrtimer interrupt hangs | |
197 | * @max_hang_time: Maximum time spent in hrtimer_interrupt | |
f61eff83 AMG |
198 | * @softirq_expiry_lock: Lock which is taken while softirq based hrtimer are |
199 | * expired | |
200 | * @timer_waiters: A hrtimer_cancel() invocation waits for the timer | |
201 | * callback to finish. | |
07a9a7ea | 202 | * @expires_next: absolute time of the next event, is required for remote |
5da70160 AMG |
203 | * hrtimer enqueue; it is the total first expiry time (hard |
204 | * and soft hrtimer are taken into account) | |
eb27926b | 205 | * @next_timer: Pointer to the first expiring timer |
5da70160 AMG |
206 | * @softirq_expires_next: Time to check, if soft queues needs also to be expired |
207 | * @softirq_next_timer: Pointer to the first expiring softirq based timer | |
ab8177bc | 208 | * @clock_base: array of clock bases for this cpu |
895bdfa7 TG |
209 | * |
210 | * Note: next_timer is just an optimization for __remove_hrtimer(). | |
211 | * Do not dereference the pointer because it is not reliable on | |
212 | * cross cpu removals. | |
3c8aa39d TG |
213 | */ |
214 | struct hrtimer_cpu_base { | |
ecb49d1a | 215 | raw_spinlock_t lock; |
cddd0248 | 216 | unsigned int cpu; |
f55a6faa | 217 | unsigned int active_bases; |
868a3e91 | 218 | unsigned int clock_was_set_seq; |
5da70160 AMG |
219 | unsigned int hres_active : 1, |
220 | in_hrtirq : 1, | |
221 | hang_detected : 1, | |
222 | softirq_activated : 1; | |
11a9fe06 | 223 | #ifdef CONFIG_HIGH_RES_TIMERS |
a6ffebce | 224 | unsigned int nr_events; |
da21c5a5 AMG |
225 | unsigned short nr_retries; |
226 | unsigned short nr_hangs; | |
a6ffebce | 227 | unsigned int max_hang_time; |
f61eff83 AMG |
228 | #endif |
229 | #ifdef CONFIG_PREEMPT_RT | |
230 | spinlock_t softirq_expiry_lock; | |
231 | atomic_t timer_waiters; | |
54cdfdb4 | 232 | #endif |
07a9a7ea | 233 | ktime_t expires_next; |
eb27926b | 234 | struct hrtimer *next_timer; |
5da70160 AMG |
235 | ktime_t softirq_expires_next; |
236 | struct hrtimer *softirq_next_timer; | |
f24444b0 | 237 | struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES]; |
6d9a1411 | 238 | } ____cacheline_aligned; |
c0a31329 | 239 | |
63ca243b AV |
240 | static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time) |
241 | { | |
998adc3d | 242 | timer->node.expires = time; |
654c8e0b | 243 | timer->_softexpires = time; |
63ca243b | 244 | } |
654c8e0b AV |
245 | |
246 | static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta) | |
247 | { | |
248 | timer->_softexpires = time; | |
998adc3d | 249 | timer->node.expires = ktime_add_safe(time, delta); |
654c8e0b AV |
250 | } |
251 | ||
da8b44d5 | 252 | static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, u64 delta) |
654c8e0b AV |
253 | { |
254 | timer->_softexpires = time; | |
998adc3d | 255 | timer->node.expires = ktime_add_safe(time, ns_to_ktime(delta)); |
654c8e0b AV |
256 | } |
257 | ||
63ca243b AV |
258 | static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64) |
259 | { | |
2456e855 TG |
260 | timer->node.expires = tv64; |
261 | timer->_softexpires = tv64; | |
63ca243b AV |
262 | } |
263 | ||
264 | static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time) | |
265 | { | |
998adc3d | 266 | timer->node.expires = ktime_add_safe(timer->node.expires, time); |
654c8e0b | 267 | timer->_softexpires = ktime_add_safe(timer->_softexpires, time); |
63ca243b AV |
268 | } |
269 | ||
7597bc94 | 270 | static inline void hrtimer_add_expires_ns(struct hrtimer *timer, u64 ns) |
63ca243b | 271 | { |
998adc3d | 272 | timer->node.expires = ktime_add_ns(timer->node.expires, ns); |
654c8e0b | 273 | timer->_softexpires = ktime_add_ns(timer->_softexpires, ns); |
63ca243b AV |
274 | } |
275 | ||
276 | static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer) | |
277 | { | |
998adc3d | 278 | return timer->node.expires; |
63ca243b AV |
279 | } |
280 | ||
654c8e0b AV |
281 | static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer) |
282 | { | |
283 | return timer->_softexpires; | |
284 | } | |
285 | ||
63ca243b AV |
286 | static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer) |
287 | { | |
2456e855 | 288 | return timer->node.expires; |
63ca243b | 289 | } |
654c8e0b AV |
290 | static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer) |
291 | { | |
2456e855 | 292 | return timer->_softexpires; |
654c8e0b | 293 | } |
63ca243b AV |
294 | |
295 | static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer) | |
296 | { | |
998adc3d | 297 | return ktime_to_ns(timer->node.expires); |
63ca243b AV |
298 | } |
299 | ||
300 | static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer) | |
301 | { | |
998adc3d | 302 | return ktime_sub(timer->node.expires, timer->base->get_time()); |
63ca243b AV |
303 | } |
304 | ||
54cdfdb4 TG |
305 | static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer) |
306 | { | |
307 | return timer->base->get_time(); | |
308 | } | |
309 | ||
28bfd18b AMG |
310 | static inline int hrtimer_is_hres_active(struct hrtimer *timer) |
311 | { | |
312 | return IS_ENABLED(CONFIG_HIGH_RES_TIMERS) ? | |
313 | timer->base->cpu_base->hres_active : 0; | |
314 | } | |
315 | ||
21d6d52a TG |
316 | #ifdef CONFIG_HIGH_RES_TIMERS |
317 | struct clock_event_device; | |
318 | ||
319 | extern void hrtimer_interrupt(struct clock_event_device *dev); | |
320 | ||
398ca17f TG |
321 | extern unsigned int hrtimer_resolution; |
322 | ||
54cdfdb4 TG |
323 | #else |
324 | ||
d711b8b3 | 325 | #define hrtimer_resolution (unsigned int)LOW_RES_NSEC |
398ca17f | 326 | |
54cdfdb4 TG |
327 | #endif |
328 | ||
203cbf77 TG |
329 | static inline ktime_t |
330 | __hrtimer_expires_remaining_adjusted(const struct hrtimer *timer, ktime_t now) | |
331 | { | |
332 | ktime_t rem = ktime_sub(timer->node.expires, now); | |
333 | ||
334 | /* | |
335 | * Adjust relative timers for the extra we added in | |
336 | * hrtimer_start_range_ns() to prevent short timeouts. | |
337 | */ | |
338 | if (IS_ENABLED(CONFIG_TIME_LOW_RES) && timer->is_rel) | |
2456e855 | 339 | rem -= hrtimer_resolution; |
203cbf77 TG |
340 | return rem; |
341 | } | |
342 | ||
343 | static inline ktime_t | |
344 | hrtimer_expires_remaining_adjusted(const struct hrtimer *timer) | |
345 | { | |
346 | return __hrtimer_expires_remaining_adjusted(timer, | |
347 | timer->base->get_time()); | |
348 | } | |
349 | ||
9ec26907 TG |
350 | #ifdef CONFIG_TIMERFD |
351 | extern void timerfd_clock_was_set(void); | |
66f7b0c8 | 352 | extern void timerfd_resume(void); |
9ec26907 TG |
353 | #else |
354 | static inline void timerfd_clock_was_set(void) { } | |
66f7b0c8 | 355 | static inline void timerfd_resume(void) { } |
9ec26907 | 356 | #endif |
b12a03ce | 357 | |
2e94d1f7 | 358 | DECLARE_PER_CPU(struct tick_device, tick_cpu_device); |
2e94d1f7 | 359 | |
f61eff83 AMG |
360 | #ifdef CONFIG_PREEMPT_RT |
361 | void hrtimer_cancel_wait_running(const struct hrtimer *timer); | |
362 | #else | |
363 | static inline void hrtimer_cancel_wait_running(struct hrtimer *timer) | |
364 | { | |
365 | cpu_relax(); | |
366 | } | |
367 | #endif | |
2e94d1f7 | 368 | |
c0a31329 TG |
369 | /* Exported timer functions: */ |
370 | ||
371 | /* Initialize timers: */ | |
7978672c GA |
372 | extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock, |
373 | enum hrtimer_mode mode); | |
dbc1625f SAS |
374 | extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, clockid_t clock_id, |
375 | enum hrtimer_mode mode); | |
c0a31329 | 376 | |
237fc6e7 TG |
377 | #ifdef CONFIG_DEBUG_OBJECTS_TIMERS |
378 | extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock, | |
379 | enum hrtimer_mode mode); | |
dbc1625f SAS |
380 | extern void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl, |
381 | clockid_t clock_id, | |
382 | enum hrtimer_mode mode); | |
237fc6e7 TG |
383 | |
384 | extern void destroy_hrtimer_on_stack(struct hrtimer *timer); | |
385 | #else | |
386 | static inline void hrtimer_init_on_stack(struct hrtimer *timer, | |
387 | clockid_t which_clock, | |
388 | enum hrtimer_mode mode) | |
389 | { | |
390 | hrtimer_init(timer, which_clock, mode); | |
391 | } | |
dbc1625f SAS |
392 | |
393 | static inline void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl, | |
394 | clockid_t clock_id, | |
395 | enum hrtimer_mode mode) | |
396 | { | |
397 | hrtimer_init_sleeper(sl, clock_id, mode); | |
398 | } | |
399 | ||
237fc6e7 TG |
400 | static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { } |
401 | #endif | |
402 | ||
c0a31329 | 403 | /* Basic timer operations: */ |
61699e13 | 404 | extern void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, |
da8b44d5 | 405 | u64 range_ns, const enum hrtimer_mode mode); |
7f1e2ca9 | 406 | |
02a171af | 407 | /** |
6de6250c | 408 | * hrtimer_start - (re)start an hrtimer |
02a171af TG |
409 | * @timer: the timer to be added |
410 | * @tim: expiry time | |
6de6250c | 411 | * @mode: timer mode: absolute (HRTIMER_MODE_ABS) or |
5da70160 AMG |
412 | * relative (HRTIMER_MODE_REL), and pinned (HRTIMER_MODE_PINNED); |
413 | * softirq based mode is considered for debug purpose only! | |
02a171af | 414 | */ |
61699e13 TG |
415 | static inline void hrtimer_start(struct hrtimer *timer, ktime_t tim, |
416 | const enum hrtimer_mode mode) | |
02a171af | 417 | { |
61699e13 | 418 | hrtimer_start_range_ns(timer, tim, 0, mode); |
02a171af TG |
419 | } |
420 | ||
c0a31329 TG |
421 | extern int hrtimer_cancel(struct hrtimer *timer); |
422 | extern int hrtimer_try_to_cancel(struct hrtimer *timer); | |
423 | ||
61699e13 TG |
424 | static inline void hrtimer_start_expires(struct hrtimer *timer, |
425 | enum hrtimer_mode mode) | |
63ca243b | 426 | { |
da8b44d5 | 427 | u64 delta; |
da8f2e17 AV |
428 | ktime_t soft, hard; |
429 | soft = hrtimer_get_softexpires(timer); | |
430 | hard = hrtimer_get_expires(timer); | |
431 | delta = ktime_to_ns(ktime_sub(hard, soft)); | |
61699e13 | 432 | hrtimer_start_range_ns(timer, soft, delta, mode); |
63ca243b AV |
433 | } |
434 | ||
01656464 TG |
435 | void hrtimer_sleeper_start_expires(struct hrtimer_sleeper *sl, |
436 | enum hrtimer_mode mode); | |
437 | ||
61699e13 | 438 | static inline void hrtimer_restart(struct hrtimer *timer) |
c9cb2e3d | 439 | { |
61699e13 | 440 | hrtimer_start_expires(timer, HRTIMER_MODE_ABS); |
c9cb2e3d | 441 | } |
c0a31329 TG |
442 | |
443 | /* Query timers: */ | |
203cbf77 TG |
444 | extern ktime_t __hrtimer_get_remaining(const struct hrtimer *timer, bool adjust); |
445 | ||
66981c37 MCC |
446 | /** |
447 | * hrtimer_get_remaining - get remaining time for the timer | |
448 | * @timer: the timer to read | |
449 | */ | |
203cbf77 TG |
450 | static inline ktime_t hrtimer_get_remaining(const struct hrtimer *timer) |
451 | { | |
452 | return __hrtimer_get_remaining(timer, false); | |
453 | } | |
c0a31329 | 454 | |
c1ad348b | 455 | extern u64 hrtimer_get_next_event(void); |
a59855cd | 456 | extern u64 hrtimer_next_event_without(const struct hrtimer *exclude); |
69239749 | 457 | |
887d9dc9 | 458 | extern bool hrtimer_active(const struct hrtimer *timer); |
c0a31329 | 459 | |
56144737 | 460 | /** |
66981c37 | 461 | * hrtimer_is_queued - check, whether the timer is on one of the queues |
56144737 ED |
462 | * @timer: Timer to check |
463 | * | |
464 | * Returns: True if the timer is queued, false otherwise | |
465 | * | |
466 | * The function can be used lockless, but it gives only a current snapshot. | |
54cdfdb4 | 467 | */ |
56144737 | 468 | static inline bool hrtimer_is_queued(struct hrtimer *timer) |
54cdfdb4 | 469 | { |
56144737 ED |
470 | /* The READ_ONCE pairs with the update functions of timer->state */ |
471 | return !!(READ_ONCE(timer->state) & HRTIMER_STATE_ENQUEUED); | |
54cdfdb4 TG |
472 | } |
473 | ||
4346f654 OH |
474 | /* |
475 | * Helper function to check, whether the timer is running the callback | |
476 | * function | |
477 | */ | |
478 | static inline int hrtimer_callback_running(struct hrtimer *timer) | |
479 | { | |
3f0b9e8e | 480 | return timer->base->running == timer; |
4346f654 OH |
481 | } |
482 | ||
c0a31329 | 483 | /* Forward a hrtimer so it expires after now: */ |
4d672e7a | 484 | extern u64 |
44f21475 | 485 | hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval); |
c0a31329 | 486 | |
91e5a217 TG |
487 | /** |
488 | * hrtimer_forward_now - forward the timer expiry so it expires after now | |
489 | * @timer: hrtimer to forward | |
490 | * @interval: the interval to forward | |
491 | * | |
492 | * Forward the timer expiry so it will expire after the current time | |
493 | * of the hrtimer clock base. Returns the number of overruns. | |
494 | * | |
495 | * Can be safely called from the callback function of @timer. If | |
496 | * called from other contexts @timer must neither be enqueued nor | |
497 | * running the callback and the caller needs to take care of | |
498 | * serialization. | |
499 | * | |
500 | * Note: This only updates the timer expiry value and does not requeue | |
501 | * the timer. | |
502 | */ | |
4d672e7a DL |
503 | static inline u64 hrtimer_forward_now(struct hrtimer *timer, |
504 | ktime_t interval) | |
5e05ad7d DL |
505 | { |
506 | return hrtimer_forward(timer, timer->base->get_time(), interval); | |
507 | } | |
508 | ||
10c94ec1 | 509 | /* Precise sleep: */ |
ce41aaf4 | 510 | |
c0edd7c9 | 511 | extern int nanosleep_copyout(struct restart_block *, struct timespec64 *); |
ea2d1f7f | 512 | extern long hrtimer_nanosleep(ktime_t rqtp, const enum hrtimer_mode mode, |
10c94ec1 TG |
513 | const clockid_t clockid); |
514 | ||
da8b44d5 | 515 | extern int schedule_hrtimeout_range(ktime_t *expires, u64 delta, |
dbc1625f | 516 | const enum hrtimer_mode mode); |
351b3f7a | 517 | extern int schedule_hrtimeout_range_clock(ktime_t *expires, |
da8b44d5 JS |
518 | u64 delta, |
519 | const enum hrtimer_mode mode, | |
90777713 | 520 | clockid_t clock_id); |
7bb67439 AV |
521 | extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode); |
522 | ||
c0a31329 TG |
523 | /* Soft interrupt function to run the hrtimer queues: */ |
524 | extern void hrtimer_run_queues(void); | |
525 | ||
526 | /* Bootup initialization: */ | |
527 | extern void __init hrtimers_init(void); | |
528 | ||
88ad0bf6 IM |
529 | /* Show pending timers: */ |
530 | extern void sysrq_timer_list_show(void); | |
531 | ||
27590dc1 TG |
532 | int hrtimers_prepare_cpu(unsigned int cpu); |
533 | #ifdef CONFIG_HOTPLUG_CPU | |
534 | int hrtimers_dead_cpu(unsigned int cpu); | |
535 | #else | |
536 | #define hrtimers_dead_cpu NULL | |
537 | #endif | |
538 | ||
c0a31329 | 539 | #endif |