Commit | Line | Data |
---|---|---|
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> |
50d91c76 | 16 | #include <linux/hrtimer_types.h> |
c0a31329 TG |
17 | #include <linux/init.h> |
18 | #include <linux/list.h> | |
6060ef31 | 19 | #include <linux/percpu-defs.h> |
50d91c76 | 20 | #include <linux/rbtree.h> |
0cd39f46 | 21 | #include <linux/seqlock.h> |
507e1231 | 22 | #include <linux/timer.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 | ||
54cdfdb4 TG |
62 | /* |
63 | * Values to track state of the timer | |
303e967f TG |
64 | * |
65 | * Possible states: | |
66 | * | |
67 | * 0x00 inactive | |
68 | * 0x01 enqueued into rbtree | |
54cdfdb4 | 69 | * |
887d9dc9 PZ |
70 | * The callback state is not part of the timer->state because clearing it would |
71 | * mean touching the timer after the callback, this makes it impossible to free | |
72 | * the timer from the callback function. | |
53370d2e | 73 | * |
887d9dc9 PZ |
74 | * Therefore we track the callback state in: |
75 | * | |
76 | * timer->base->cpu_base->running == timer | |
77 | * | |
78 | * On SMP it is possible to have a "callback function running and enqueued" | |
79 | * status. It happens for example when a posix timer expired and the callback | |
303e967f TG |
80 | * queued a signal. Between dropping the lock which protects the posix timer |
81 | * and reacquiring the base lock of the hrtimer, another CPU can deliver the | |
887d9dc9 | 82 | * signal and rearm the timer. |
303e967f TG |
83 | * |
84 | * All state transitions are protected by cpu_base->lock. | |
85 | */ | |
86 | #define HRTIMER_STATE_INACTIVE 0x00 | |
87 | #define HRTIMER_STATE_ENQUEUED 0x01 | |
303e967f | 88 | |
00362e33 TG |
89 | /** |
90 | * struct hrtimer_sleeper - simple sleeper structure | |
00362e33 TG |
91 | * @timer: embedded timer structure |
92 | * @task: task to wake up | |
93 | * | |
94 | * task is set to NULL, when the timer expires. | |
95 | */ | |
96 | struct hrtimer_sleeper { | |
97 | struct hrtimer timer; | |
98 | struct task_struct *task; | |
99 | }; | |
100 | ||
b8e38413 | 101 | #ifdef CONFIG_64BIT |
3f0b9e8e | 102 | # define __hrtimer_clock_base_align ____cacheline_aligned |
b8e38413 | 103 | #else |
3f0b9e8e | 104 | # define __hrtimer_clock_base_align |
b8e38413 TG |
105 | #endif |
106 | ||
c0a31329 | 107 | /** |
d1d67174 | 108 | * struct hrtimer_clock_base - the timer base for a specific clock |
05fb6bf0 | 109 | * @cpu_base: per cpu clock base |
3c8aa39d TG |
110 | * @index: clock type index for per_cpu support when moving a |
111 | * timer to a base on another cpu. | |
4d258b25 | 112 | * @clockid: clock id for per_cpu support |
3f0b9e8e AMG |
113 | * @seq: seqcount around __run_hrtimer |
114 | * @running: pointer to the currently running hrtimer | |
92127c7a | 115 | * @active: red black tree root node for the active timers |
92127c7a | 116 | * @get_time: function to retrieve the current time of the clock |
54cdfdb4 | 117 | * @offset: offset of this clock to the monotonic base |
c0a31329 | 118 | */ |
3c8aa39d TG |
119 | struct hrtimer_clock_base { |
120 | struct hrtimer_cpu_base *cpu_base; | |
3f0b9e8e | 121 | unsigned int index; |
ab8177bc | 122 | clockid_t clockid; |
af5a06b5 | 123 | seqcount_raw_spinlock_t seq; |
3f0b9e8e | 124 | struct hrtimer *running; |
998adc3d | 125 | struct timerqueue_head active; |
c0a31329 | 126 | ktime_t (*get_time)(void); |
54cdfdb4 | 127 | ktime_t offset; |
3f0b9e8e | 128 | } __hrtimer_clock_base_align; |
3c8aa39d | 129 | |
e06383db | 130 | enum hrtimer_base_type { |
e06383db | 131 | HRTIMER_BASE_MONOTONIC, |
68fa61c0 | 132 | HRTIMER_BASE_REALTIME, |
a3ed0e43 | 133 | HRTIMER_BASE_BOOTTIME, |
90adda98 | 134 | HRTIMER_BASE_TAI, |
98ecadd4 AMG |
135 | HRTIMER_BASE_MONOTONIC_SOFT, |
136 | HRTIMER_BASE_REALTIME_SOFT, | |
a3ed0e43 | 137 | HRTIMER_BASE_BOOTTIME_SOFT, |
98ecadd4 | 138 | HRTIMER_BASE_TAI_SOFT, |
e06383db JS |
139 | HRTIMER_MAX_CLOCK_BASES, |
140 | }; | |
3c8aa39d | 141 | |
1fbc78b3 | 142 | /** |
3c8aa39d TG |
143 | * struct hrtimer_cpu_base - the per cpu clock bases |
144 | * @lock: lock protecting the base and associated clock bases | |
145 | * and timers | |
cddd0248 | 146 | * @cpu: cpu number |
ab8177bc | 147 | * @active_bases: Bitfield to mark bases with active timers |
868a3e91 | 148 | * @clock_was_set_seq: Sequence counter of clock was set events |
54cdfdb4 | 149 | * @hres_active: State of high resolution mode |
28bfd18b | 150 | * @in_hrtirq: hrtimer_interrupt() is currently executing |
41d2e494 | 151 | * @hang_detected: The last hrtimer interrupt detected a hang |
5da70160 AMG |
152 | * @softirq_activated: displays, if the softirq is raised - update of softirq |
153 | * related settings is not required then. | |
41d2e494 TG |
154 | * @nr_events: Total number of hrtimer interrupt events |
155 | * @nr_retries: Total number of hrtimer interrupt retries | |
156 | * @nr_hangs: Total number of hrtimer interrupt hangs | |
157 | * @max_hang_time: Maximum time spent in hrtimer_interrupt | |
f61eff83 AMG |
158 | * @softirq_expiry_lock: Lock which is taken while softirq based hrtimer are |
159 | * expired | |
dad6a09f | 160 | * @online: CPU is online from an hrtimers point of view |
f61eff83 AMG |
161 | * @timer_waiters: A hrtimer_cancel() invocation waits for the timer |
162 | * callback to finish. | |
07a9a7ea | 163 | * @expires_next: absolute time of the next event, is required for remote |
5da70160 AMG |
164 | * hrtimer enqueue; it is the total first expiry time (hard |
165 | * and soft hrtimer are taken into account) | |
eb27926b | 166 | * @next_timer: Pointer to the first expiring timer |
5da70160 AMG |
167 | * @softirq_expires_next: Time to check, if soft queues needs also to be expired |
168 | * @softirq_next_timer: Pointer to the first expiring softirq based timer | |
ab8177bc | 169 | * @clock_base: array of clock bases for this cpu |
895bdfa7 TG |
170 | * |
171 | * Note: next_timer is just an optimization for __remove_hrtimer(). | |
172 | * Do not dereference the pointer because it is not reliable on | |
173 | * cross cpu removals. | |
3c8aa39d TG |
174 | */ |
175 | struct hrtimer_cpu_base { | |
ecb49d1a | 176 | raw_spinlock_t lock; |
cddd0248 | 177 | unsigned int cpu; |
f55a6faa | 178 | unsigned int active_bases; |
868a3e91 | 179 | unsigned int clock_was_set_seq; |
5da70160 AMG |
180 | unsigned int hres_active : 1, |
181 | in_hrtirq : 1, | |
182 | hang_detected : 1, | |
dad6a09f FW |
183 | softirq_activated : 1, |
184 | online : 1; | |
11a9fe06 | 185 | #ifdef CONFIG_HIGH_RES_TIMERS |
a6ffebce | 186 | unsigned int nr_events; |
da21c5a5 AMG |
187 | unsigned short nr_retries; |
188 | unsigned short nr_hangs; | |
a6ffebce | 189 | unsigned int max_hang_time; |
f61eff83 AMG |
190 | #endif |
191 | #ifdef CONFIG_PREEMPT_RT | |
192 | spinlock_t softirq_expiry_lock; | |
193 | atomic_t timer_waiters; | |
54cdfdb4 | 194 | #endif |
07a9a7ea | 195 | ktime_t expires_next; |
eb27926b | 196 | struct hrtimer *next_timer; |
5da70160 AMG |
197 | ktime_t softirq_expires_next; |
198 | struct hrtimer *softirq_next_timer; | |
f24444b0 | 199 | struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES]; |
6d9a1411 | 200 | } ____cacheline_aligned; |
c0a31329 | 201 | |
63ca243b AV |
202 | static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time) |
203 | { | |
998adc3d | 204 | timer->node.expires = time; |
654c8e0b | 205 | timer->_softexpires = time; |
63ca243b | 206 | } |
654c8e0b AV |
207 | |
208 | static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta) | |
209 | { | |
210 | timer->_softexpires = time; | |
998adc3d | 211 | timer->node.expires = ktime_add_safe(time, delta); |
654c8e0b AV |
212 | } |
213 | ||
da8b44d5 | 214 | static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, u64 delta) |
654c8e0b AV |
215 | { |
216 | timer->_softexpires = time; | |
998adc3d | 217 | timer->node.expires = ktime_add_safe(time, ns_to_ktime(delta)); |
654c8e0b AV |
218 | } |
219 | ||
63ca243b AV |
220 | static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64) |
221 | { | |
2456e855 TG |
222 | timer->node.expires = tv64; |
223 | timer->_softexpires = tv64; | |
63ca243b AV |
224 | } |
225 | ||
226 | static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time) | |
227 | { | |
998adc3d | 228 | timer->node.expires = ktime_add_safe(timer->node.expires, time); |
654c8e0b | 229 | timer->_softexpires = ktime_add_safe(timer->_softexpires, time); |
63ca243b AV |
230 | } |
231 | ||
7597bc94 | 232 | static inline void hrtimer_add_expires_ns(struct hrtimer *timer, u64 ns) |
63ca243b | 233 | { |
998adc3d | 234 | timer->node.expires = ktime_add_ns(timer->node.expires, ns); |
654c8e0b | 235 | timer->_softexpires = ktime_add_ns(timer->_softexpires, ns); |
63ca243b AV |
236 | } |
237 | ||
238 | static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer) | |
239 | { | |
998adc3d | 240 | return timer->node.expires; |
63ca243b AV |
241 | } |
242 | ||
654c8e0b AV |
243 | static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer) |
244 | { | |
245 | return timer->_softexpires; | |
246 | } | |
247 | ||
63ca243b AV |
248 | static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer) |
249 | { | |
2456e855 | 250 | return timer->node.expires; |
63ca243b | 251 | } |
654c8e0b AV |
252 | static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer) |
253 | { | |
2456e855 | 254 | return timer->_softexpires; |
654c8e0b | 255 | } |
63ca243b AV |
256 | |
257 | static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer) | |
258 | { | |
998adc3d | 259 | return ktime_to_ns(timer->node.expires); |
63ca243b AV |
260 | } |
261 | ||
262 | static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer) | |
263 | { | |
998adc3d | 264 | return ktime_sub(timer->node.expires, timer->base->get_time()); |
63ca243b AV |
265 | } |
266 | ||
54cdfdb4 TG |
267 | static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer) |
268 | { | |
269 | return timer->base->get_time(); | |
270 | } | |
271 | ||
28bfd18b AMG |
272 | static inline int hrtimer_is_hres_active(struct hrtimer *timer) |
273 | { | |
274 | return IS_ENABLED(CONFIG_HIGH_RES_TIMERS) ? | |
275 | timer->base->cpu_base->hres_active : 0; | |
276 | } | |
277 | ||
21d6d52a TG |
278 | #ifdef CONFIG_HIGH_RES_TIMERS |
279 | struct clock_event_device; | |
280 | ||
281 | extern void hrtimer_interrupt(struct clock_event_device *dev); | |
282 | ||
398ca17f TG |
283 | extern unsigned int hrtimer_resolution; |
284 | ||
54cdfdb4 TG |
285 | #else |
286 | ||
d711b8b3 | 287 | #define hrtimer_resolution (unsigned int)LOW_RES_NSEC |
398ca17f | 288 | |
54cdfdb4 TG |
289 | #endif |
290 | ||
203cbf77 TG |
291 | static inline ktime_t |
292 | __hrtimer_expires_remaining_adjusted(const struct hrtimer *timer, ktime_t now) | |
293 | { | |
294 | ktime_t rem = ktime_sub(timer->node.expires, now); | |
295 | ||
296 | /* | |
297 | * Adjust relative timers for the extra we added in | |
298 | * hrtimer_start_range_ns() to prevent short timeouts. | |
299 | */ | |
300 | if (IS_ENABLED(CONFIG_TIME_LOW_RES) && timer->is_rel) | |
2456e855 | 301 | rem -= hrtimer_resolution; |
203cbf77 TG |
302 | return rem; |
303 | } | |
304 | ||
305 | static inline ktime_t | |
306 | hrtimer_expires_remaining_adjusted(const struct hrtimer *timer) | |
307 | { | |
308 | return __hrtimer_expires_remaining_adjusted(timer, | |
309 | timer->base->get_time()); | |
310 | } | |
311 | ||
9ec26907 TG |
312 | #ifdef CONFIG_TIMERFD |
313 | extern void timerfd_clock_was_set(void); | |
66f7b0c8 | 314 | extern void timerfd_resume(void); |
9ec26907 TG |
315 | #else |
316 | static inline void timerfd_clock_was_set(void) { } | |
66f7b0c8 | 317 | static inline void timerfd_resume(void) { } |
9ec26907 | 318 | #endif |
b12a03ce | 319 | |
2e94d1f7 | 320 | DECLARE_PER_CPU(struct tick_device, tick_cpu_device); |
2e94d1f7 | 321 | |
f61eff83 AMG |
322 | #ifdef CONFIG_PREEMPT_RT |
323 | void hrtimer_cancel_wait_running(const struct hrtimer *timer); | |
324 | #else | |
325 | static inline void hrtimer_cancel_wait_running(struct hrtimer *timer) | |
326 | { | |
327 | cpu_relax(); | |
328 | } | |
329 | #endif | |
2e94d1f7 | 330 | |
c0a31329 TG |
331 | /* Exported timer functions: */ |
332 | ||
333 | /* Initialize timers: */ | |
7978672c GA |
334 | extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock, |
335 | enum hrtimer_mode mode); | |
dbc1625f SAS |
336 | extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, clockid_t clock_id, |
337 | enum hrtimer_mode mode); | |
c0a31329 | 338 | |
237fc6e7 TG |
339 | #ifdef CONFIG_DEBUG_OBJECTS_TIMERS |
340 | extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock, | |
341 | enum hrtimer_mode mode); | |
dbc1625f SAS |
342 | extern void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl, |
343 | clockid_t clock_id, | |
344 | enum hrtimer_mode mode); | |
237fc6e7 TG |
345 | |
346 | extern void destroy_hrtimer_on_stack(struct hrtimer *timer); | |
347 | #else | |
348 | static inline void hrtimer_init_on_stack(struct hrtimer *timer, | |
349 | clockid_t which_clock, | |
350 | enum hrtimer_mode mode) | |
351 | { | |
352 | hrtimer_init(timer, which_clock, mode); | |
353 | } | |
dbc1625f SAS |
354 | |
355 | static inline void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl, | |
356 | clockid_t clock_id, | |
357 | enum hrtimer_mode mode) | |
358 | { | |
359 | hrtimer_init_sleeper(sl, clock_id, mode); | |
360 | } | |
361 | ||
237fc6e7 TG |
362 | static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { } |
363 | #endif | |
364 | ||
c0a31329 | 365 | /* Basic timer operations: */ |
61699e13 | 366 | extern void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, |
da8b44d5 | 367 | u64 range_ns, const enum hrtimer_mode mode); |
7f1e2ca9 | 368 | |
02a171af | 369 | /** |
6de6250c | 370 | * hrtimer_start - (re)start an hrtimer |
02a171af TG |
371 | * @timer: the timer to be added |
372 | * @tim: expiry time | |
6de6250c | 373 | * @mode: timer mode: absolute (HRTIMER_MODE_ABS) or |
5da70160 AMG |
374 | * relative (HRTIMER_MODE_REL), and pinned (HRTIMER_MODE_PINNED); |
375 | * softirq based mode is considered for debug purpose only! | |
02a171af | 376 | */ |
61699e13 TG |
377 | static inline void hrtimer_start(struct hrtimer *timer, ktime_t tim, |
378 | const enum hrtimer_mode mode) | |
02a171af | 379 | { |
61699e13 | 380 | hrtimer_start_range_ns(timer, tim, 0, mode); |
02a171af TG |
381 | } |
382 | ||
c0a31329 TG |
383 | extern int hrtimer_cancel(struct hrtimer *timer); |
384 | extern int hrtimer_try_to_cancel(struct hrtimer *timer); | |
385 | ||
61699e13 TG |
386 | static inline void hrtimer_start_expires(struct hrtimer *timer, |
387 | enum hrtimer_mode mode) | |
63ca243b | 388 | { |
da8b44d5 | 389 | u64 delta; |
da8f2e17 AV |
390 | ktime_t soft, hard; |
391 | soft = hrtimer_get_softexpires(timer); | |
392 | hard = hrtimer_get_expires(timer); | |
393 | delta = ktime_to_ns(ktime_sub(hard, soft)); | |
61699e13 | 394 | hrtimer_start_range_ns(timer, soft, delta, mode); |
63ca243b AV |
395 | } |
396 | ||
01656464 TG |
397 | void hrtimer_sleeper_start_expires(struct hrtimer_sleeper *sl, |
398 | enum hrtimer_mode mode); | |
399 | ||
61699e13 | 400 | static inline void hrtimer_restart(struct hrtimer *timer) |
c9cb2e3d | 401 | { |
61699e13 | 402 | hrtimer_start_expires(timer, HRTIMER_MODE_ABS); |
c9cb2e3d | 403 | } |
c0a31329 TG |
404 | |
405 | /* Query timers: */ | |
203cbf77 TG |
406 | extern ktime_t __hrtimer_get_remaining(const struct hrtimer *timer, bool adjust); |
407 | ||
66981c37 MCC |
408 | /** |
409 | * hrtimer_get_remaining - get remaining time for the timer | |
410 | * @timer: the timer to read | |
411 | */ | |
203cbf77 TG |
412 | static inline ktime_t hrtimer_get_remaining(const struct hrtimer *timer) |
413 | { | |
414 | return __hrtimer_get_remaining(timer, false); | |
415 | } | |
c0a31329 | 416 | |
c1ad348b | 417 | extern u64 hrtimer_get_next_event(void); |
a59855cd | 418 | extern u64 hrtimer_next_event_without(const struct hrtimer *exclude); |
69239749 | 419 | |
887d9dc9 | 420 | extern bool hrtimer_active(const struct hrtimer *timer); |
c0a31329 | 421 | |
56144737 | 422 | /** |
66981c37 | 423 | * hrtimer_is_queued - check, whether the timer is on one of the queues |
56144737 ED |
424 | * @timer: Timer to check |
425 | * | |
426 | * Returns: True if the timer is queued, false otherwise | |
427 | * | |
428 | * The function can be used lockless, but it gives only a current snapshot. | |
54cdfdb4 | 429 | */ |
56144737 | 430 | static inline bool hrtimer_is_queued(struct hrtimer *timer) |
54cdfdb4 | 431 | { |
56144737 ED |
432 | /* The READ_ONCE pairs with the update functions of timer->state */ |
433 | return !!(READ_ONCE(timer->state) & HRTIMER_STATE_ENQUEUED); | |
54cdfdb4 TG |
434 | } |
435 | ||
4346f654 OH |
436 | /* |
437 | * Helper function to check, whether the timer is running the callback | |
438 | * function | |
439 | */ | |
440 | static inline int hrtimer_callback_running(struct hrtimer *timer) | |
441 | { | |
3f0b9e8e | 442 | return timer->base->running == timer; |
4346f654 OH |
443 | } |
444 | ||
c0a31329 | 445 | /* Forward a hrtimer so it expires after now: */ |
4d672e7a | 446 | extern u64 |
44f21475 | 447 | hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval); |
c0a31329 | 448 | |
91e5a217 TG |
449 | /** |
450 | * hrtimer_forward_now - forward the timer expiry so it expires after now | |
451 | * @timer: hrtimer to forward | |
452 | * @interval: the interval to forward | |
453 | * | |
454 | * Forward the timer expiry so it will expire after the current time | |
455 | * of the hrtimer clock base. Returns the number of overruns. | |
456 | * | |
457 | * Can be safely called from the callback function of @timer. If | |
458 | * called from other contexts @timer must neither be enqueued nor | |
459 | * running the callback and the caller needs to take care of | |
460 | * serialization. | |
461 | * | |
462 | * Note: This only updates the timer expiry value and does not requeue | |
463 | * the timer. | |
464 | */ | |
4d672e7a DL |
465 | static inline u64 hrtimer_forward_now(struct hrtimer *timer, |
466 | ktime_t interval) | |
5e05ad7d DL |
467 | { |
468 | return hrtimer_forward(timer, timer->base->get_time(), interval); | |
469 | } | |
470 | ||
10c94ec1 | 471 | /* Precise sleep: */ |
ce41aaf4 | 472 | |
c0edd7c9 | 473 | extern int nanosleep_copyout(struct restart_block *, struct timespec64 *); |
ea2d1f7f | 474 | extern long hrtimer_nanosleep(ktime_t rqtp, const enum hrtimer_mode mode, |
10c94ec1 TG |
475 | const clockid_t clockid); |
476 | ||
da8b44d5 | 477 | extern int schedule_hrtimeout_range(ktime_t *expires, u64 delta, |
dbc1625f | 478 | const enum hrtimer_mode mode); |
351b3f7a | 479 | extern int schedule_hrtimeout_range_clock(ktime_t *expires, |
da8b44d5 JS |
480 | u64 delta, |
481 | const enum hrtimer_mode mode, | |
90777713 | 482 | clockid_t clock_id); |
7bb67439 AV |
483 | extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode); |
484 | ||
c0a31329 TG |
485 | /* Soft interrupt function to run the hrtimer queues: */ |
486 | extern void hrtimer_run_queues(void); | |
487 | ||
488 | /* Bootup initialization: */ | |
489 | extern void __init hrtimers_init(void); | |
490 | ||
88ad0bf6 IM |
491 | /* Show pending timers: */ |
492 | extern void sysrq_timer_list_show(void); | |
493 | ||
27590dc1 TG |
494 | int hrtimers_prepare_cpu(unsigned int cpu); |
495 | #ifdef CONFIG_HOTPLUG_CPU | |
5c0930cc | 496 | int hrtimers_cpu_dying(unsigned int cpu); |
27590dc1 | 497 | #else |
5c0930cc | 498 | #define hrtimers_cpu_dying NULL |
27590dc1 TG |
499 | #endif |
500 | ||
c0a31329 | 501 | #endif |