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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> |
507e1231 | 20 | #include <linux/timer.h> |
998adc3d | 21 | #include <linux/timerqueue.h> |
c0a31329 | 22 | |
3c8aa39d TG |
23 | struct hrtimer_clock_base; |
24 | struct hrtimer_cpu_base; | |
25 | ||
c0a31329 TG |
26 | /* |
27 | * Mode arguments of xxx_hrtimer functions: | |
19b51cb5 AMG |
28 | * |
29 | * HRTIMER_MODE_ABS - Time value is absolute | |
30 | * HRTIMER_MODE_REL - Time value is relative to now | |
31 | * HRTIMER_MODE_PINNED - Timer is bound to CPU (is only considered | |
32 | * when starting the timer) | |
98ecadd4 AMG |
33 | * HRTIMER_MODE_SOFT - Timer callback function will be executed in |
34 | * soft irq context | |
c0a31329 TG |
35 | */ |
36 | enum hrtimer_mode { | |
19b51cb5 AMG |
37 | HRTIMER_MODE_ABS = 0x00, |
38 | HRTIMER_MODE_REL = 0x01, | |
39 | HRTIMER_MODE_PINNED = 0x02, | |
98ecadd4 | 40 | HRTIMER_MODE_SOFT = 0x04, |
19b51cb5 AMG |
41 | |
42 | HRTIMER_MODE_ABS_PINNED = HRTIMER_MODE_ABS | HRTIMER_MODE_PINNED, | |
43 | HRTIMER_MODE_REL_PINNED = HRTIMER_MODE_REL | HRTIMER_MODE_PINNED, | |
98ecadd4 AMG |
44 | |
45 | HRTIMER_MODE_ABS_SOFT = HRTIMER_MODE_ABS | HRTIMER_MODE_SOFT, | |
46 | HRTIMER_MODE_REL_SOFT = HRTIMER_MODE_REL | HRTIMER_MODE_SOFT, | |
47 | ||
48 | HRTIMER_MODE_ABS_PINNED_SOFT = HRTIMER_MODE_ABS_PINNED | HRTIMER_MODE_SOFT, | |
49 | HRTIMER_MODE_REL_PINNED_SOFT = HRTIMER_MODE_REL_PINNED | HRTIMER_MODE_SOFT, | |
50 | ||
c0a31329 TG |
51 | }; |
52 | ||
c9cb2e3d TG |
53 | /* |
54 | * Return values for the callback function | |
55 | */ | |
c0a31329 | 56 | enum hrtimer_restart { |
c9cb2e3d TG |
57 | HRTIMER_NORESTART, /* Timer is not restarted */ |
58 | HRTIMER_RESTART, /* Timer must be restarted */ | |
c0a31329 TG |
59 | }; |
60 | ||
54cdfdb4 TG |
61 | /* |
62 | * Values to track state of the timer | |
303e967f TG |
63 | * |
64 | * Possible states: | |
65 | * | |
66 | * 0x00 inactive | |
67 | * 0x01 enqueued into rbtree | |
54cdfdb4 | 68 | * |
887d9dc9 PZ |
69 | * The callback state is not part of the timer->state because clearing it would |
70 | * mean touching the timer after the callback, this makes it impossible to free | |
71 | * the timer from the callback function. | |
53370d2e | 72 | * |
887d9dc9 PZ |
73 | * Therefore we track the callback state in: |
74 | * | |
75 | * timer->base->cpu_base->running == timer | |
76 | * | |
77 | * On SMP it is possible to have a "callback function running and enqueued" | |
78 | * status. It happens for example when a posix timer expired and the callback | |
303e967f TG |
79 | * queued a signal. Between dropping the lock which protects the posix timer |
80 | * and reacquiring the base lock of the hrtimer, another CPU can deliver the | |
887d9dc9 | 81 | * signal and rearm the timer. |
303e967f TG |
82 | * |
83 | * All state transitions are protected by cpu_base->lock. | |
84 | */ | |
85 | #define HRTIMER_STATE_INACTIVE 0x00 | |
86 | #define HRTIMER_STATE_ENQUEUED 0x01 | |
303e967f | 87 | |
c0a31329 TG |
88 | /** |
89 | * struct hrtimer - the basic hrtimer structure | |
998adc3d JS |
90 | * @node: timerqueue node, which also manages node.expires, |
91 | * the absolute expiry time in the hrtimers internal | |
c0a31329 | 92 | * representation. The time is related to the clock on |
592aa999 TG |
93 | * which the timer is based. Is setup by adding |
94 | * slack to the _softexpires value. For non range timers | |
95 | * identical to _softexpires. | |
96 | * @_softexpires: the absolute earliest expiry time of the hrtimer. | |
97 | * The time which was given as expiry time when the timer | |
98 | * was armed. | |
c0a31329 | 99 | * @function: timer expiry callback function |
c0a31329 | 100 | * @base: pointer to the timer base (per cpu and per clock) |
303e967f | 101 | * @state: state information (See bit values above) |
203cbf77 | 102 | * @is_rel: Set if the timer was armed relative |
5da70160 | 103 | * @is_soft: Set if hrtimer will be expired in soft interrupt context. |
c0a31329 | 104 | * |
54cdfdb4 | 105 | * The hrtimer structure must be initialized by hrtimer_init() |
c0a31329 TG |
106 | */ |
107 | struct hrtimer { | |
998adc3d | 108 | struct timerqueue_node node; |
654c8e0b | 109 | ktime_t _softexpires; |
3c8aa39d TG |
110 | enum hrtimer_restart (*function)(struct hrtimer *); |
111 | struct hrtimer_clock_base *base; | |
203cbf77 TG |
112 | u8 state; |
113 | u8 is_rel; | |
5da70160 | 114 | u8 is_soft; |
c0a31329 TG |
115 | }; |
116 | ||
00362e33 TG |
117 | /** |
118 | * struct hrtimer_sleeper - simple sleeper structure | |
00362e33 TG |
119 | * @timer: embedded timer structure |
120 | * @task: task to wake up | |
121 | * | |
122 | * task is set to NULL, when the timer expires. | |
123 | */ | |
124 | struct hrtimer_sleeper { | |
125 | struct hrtimer timer; | |
126 | struct task_struct *task; | |
127 | }; | |
128 | ||
b8e38413 | 129 | #ifdef CONFIG_64BIT |
3f0b9e8e | 130 | # define __hrtimer_clock_base_align ____cacheline_aligned |
b8e38413 | 131 | #else |
3f0b9e8e | 132 | # define __hrtimer_clock_base_align |
b8e38413 TG |
133 | #endif |
134 | ||
c0a31329 | 135 | /** |
d1d67174 | 136 | * struct hrtimer_clock_base - the timer base for a specific clock |
05fb6bf0 | 137 | * @cpu_base: per cpu clock base |
3c8aa39d TG |
138 | * @index: clock type index for per_cpu support when moving a |
139 | * timer to a base on another cpu. | |
4d258b25 | 140 | * @clockid: clock id for per_cpu support |
3f0b9e8e AMG |
141 | * @seq: seqcount around __run_hrtimer |
142 | * @running: pointer to the currently running hrtimer | |
92127c7a | 143 | * @active: red black tree root node for the active timers |
92127c7a | 144 | * @get_time: function to retrieve the current time of the clock |
54cdfdb4 | 145 | * @offset: offset of this clock to the monotonic base |
c0a31329 | 146 | */ |
3c8aa39d TG |
147 | struct hrtimer_clock_base { |
148 | struct hrtimer_cpu_base *cpu_base; | |
3f0b9e8e | 149 | unsigned int index; |
ab8177bc | 150 | clockid_t clockid; |
3f0b9e8e AMG |
151 | seqcount_t seq; |
152 | struct hrtimer *running; | |
998adc3d | 153 | struct timerqueue_head active; |
c0a31329 | 154 | ktime_t (*get_time)(void); |
54cdfdb4 | 155 | ktime_t offset; |
3f0b9e8e | 156 | } __hrtimer_clock_base_align; |
3c8aa39d | 157 | |
e06383db | 158 | enum hrtimer_base_type { |
e06383db | 159 | HRTIMER_BASE_MONOTONIC, |
68fa61c0 | 160 | HRTIMER_BASE_REALTIME, |
a3ed0e43 | 161 | HRTIMER_BASE_BOOTTIME, |
90adda98 | 162 | HRTIMER_BASE_TAI, |
98ecadd4 AMG |
163 | HRTIMER_BASE_MONOTONIC_SOFT, |
164 | HRTIMER_BASE_REALTIME_SOFT, | |
a3ed0e43 | 165 | HRTIMER_BASE_BOOTTIME_SOFT, |
98ecadd4 | 166 | HRTIMER_BASE_TAI_SOFT, |
e06383db JS |
167 | HRTIMER_MAX_CLOCK_BASES, |
168 | }; | |
3c8aa39d | 169 | |
1fbc78b3 | 170 | /** |
3c8aa39d TG |
171 | * struct hrtimer_cpu_base - the per cpu clock bases |
172 | * @lock: lock protecting the base and associated clock bases | |
173 | * and timers | |
cddd0248 | 174 | * @cpu: cpu number |
ab8177bc | 175 | * @active_bases: Bitfield to mark bases with active timers |
868a3e91 | 176 | * @clock_was_set_seq: Sequence counter of clock was set events |
54cdfdb4 | 177 | * @hres_active: State of high resolution mode |
28bfd18b | 178 | * @in_hrtirq: hrtimer_interrupt() is currently executing |
41d2e494 | 179 | * @hang_detected: The last hrtimer interrupt detected a hang |
5da70160 AMG |
180 | * @softirq_activated: displays, if the softirq is raised - update of softirq |
181 | * related settings is not required then. | |
41d2e494 TG |
182 | * @nr_events: Total number of hrtimer interrupt events |
183 | * @nr_retries: Total number of hrtimer interrupt retries | |
184 | * @nr_hangs: Total number of hrtimer interrupt hangs | |
185 | * @max_hang_time: Maximum time spent in hrtimer_interrupt | |
07a9a7ea | 186 | * @expires_next: absolute time of the next event, is required for remote |
5da70160 AMG |
187 | * hrtimer enqueue; it is the total first expiry time (hard |
188 | * and soft hrtimer are taken into account) | |
eb27926b | 189 | * @next_timer: Pointer to the first expiring timer |
5da70160 AMG |
190 | * @softirq_expires_next: Time to check, if soft queues needs also to be expired |
191 | * @softirq_next_timer: Pointer to the first expiring softirq based timer | |
ab8177bc | 192 | * @clock_base: array of clock bases for this cpu |
895bdfa7 TG |
193 | * |
194 | * Note: next_timer is just an optimization for __remove_hrtimer(). | |
195 | * Do not dereference the pointer because it is not reliable on | |
196 | * cross cpu removals. | |
3c8aa39d TG |
197 | */ |
198 | struct hrtimer_cpu_base { | |
ecb49d1a | 199 | raw_spinlock_t lock; |
cddd0248 | 200 | unsigned int cpu; |
f55a6faa | 201 | unsigned int active_bases; |
868a3e91 | 202 | unsigned int clock_was_set_seq; |
5da70160 AMG |
203 | unsigned int hres_active : 1, |
204 | in_hrtirq : 1, | |
205 | hang_detected : 1, | |
206 | softirq_activated : 1; | |
11a9fe06 | 207 | #ifdef CONFIG_HIGH_RES_TIMERS |
a6ffebce | 208 | unsigned int nr_events; |
da21c5a5 AMG |
209 | unsigned short nr_retries; |
210 | unsigned short nr_hangs; | |
a6ffebce | 211 | unsigned int max_hang_time; |
54cdfdb4 | 212 | #endif |
07a9a7ea | 213 | ktime_t expires_next; |
eb27926b | 214 | struct hrtimer *next_timer; |
5da70160 AMG |
215 | ktime_t softirq_expires_next; |
216 | struct hrtimer *softirq_next_timer; | |
f24444b0 | 217 | struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES]; |
6d9a1411 | 218 | } ____cacheline_aligned; |
c0a31329 | 219 | |
63ca243b AV |
220 | static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time) |
221 | { | |
998adc3d | 222 | timer->node.expires = time; |
654c8e0b | 223 | timer->_softexpires = time; |
63ca243b | 224 | } |
654c8e0b AV |
225 | |
226 | static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta) | |
227 | { | |
228 | timer->_softexpires = time; | |
998adc3d | 229 | timer->node.expires = ktime_add_safe(time, delta); |
654c8e0b AV |
230 | } |
231 | ||
da8b44d5 | 232 | static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, u64 delta) |
654c8e0b AV |
233 | { |
234 | timer->_softexpires = time; | |
998adc3d | 235 | timer->node.expires = ktime_add_safe(time, ns_to_ktime(delta)); |
654c8e0b AV |
236 | } |
237 | ||
63ca243b AV |
238 | static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64) |
239 | { | |
2456e855 TG |
240 | timer->node.expires = tv64; |
241 | timer->_softexpires = tv64; | |
63ca243b AV |
242 | } |
243 | ||
244 | static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time) | |
245 | { | |
998adc3d | 246 | timer->node.expires = ktime_add_safe(timer->node.expires, time); |
654c8e0b | 247 | timer->_softexpires = ktime_add_safe(timer->_softexpires, time); |
63ca243b AV |
248 | } |
249 | ||
7597bc94 | 250 | static inline void hrtimer_add_expires_ns(struct hrtimer *timer, u64 ns) |
63ca243b | 251 | { |
998adc3d | 252 | timer->node.expires = ktime_add_ns(timer->node.expires, ns); |
654c8e0b | 253 | timer->_softexpires = ktime_add_ns(timer->_softexpires, ns); |
63ca243b AV |
254 | } |
255 | ||
256 | static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer) | |
257 | { | |
998adc3d | 258 | return timer->node.expires; |
63ca243b AV |
259 | } |
260 | ||
654c8e0b AV |
261 | static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer) |
262 | { | |
263 | return timer->_softexpires; | |
264 | } | |
265 | ||
63ca243b AV |
266 | static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer) |
267 | { | |
2456e855 | 268 | return timer->node.expires; |
63ca243b | 269 | } |
654c8e0b AV |
270 | static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer) |
271 | { | |
2456e855 | 272 | return timer->_softexpires; |
654c8e0b | 273 | } |
63ca243b AV |
274 | |
275 | static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer) | |
276 | { | |
998adc3d | 277 | return ktime_to_ns(timer->node.expires); |
63ca243b AV |
278 | } |
279 | ||
280 | static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer) | |
281 | { | |
998adc3d | 282 | return ktime_sub(timer->node.expires, timer->base->get_time()); |
63ca243b AV |
283 | } |
284 | ||
54cdfdb4 TG |
285 | static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer) |
286 | { | |
287 | return timer->base->get_time(); | |
288 | } | |
289 | ||
28bfd18b AMG |
290 | static inline int hrtimer_is_hres_active(struct hrtimer *timer) |
291 | { | |
292 | return IS_ENABLED(CONFIG_HIGH_RES_TIMERS) ? | |
293 | timer->base->cpu_base->hres_active : 0; | |
294 | } | |
295 | ||
21d6d52a TG |
296 | #ifdef CONFIG_HIGH_RES_TIMERS |
297 | struct clock_event_device; | |
298 | ||
299 | extern void hrtimer_interrupt(struct clock_event_device *dev); | |
300 | ||
f55a6faa JS |
301 | extern void clock_was_set_delayed(void); |
302 | ||
398ca17f TG |
303 | extern unsigned int hrtimer_resolution; |
304 | ||
54cdfdb4 TG |
305 | #else |
306 | ||
d711b8b3 | 307 | #define hrtimer_resolution (unsigned int)LOW_RES_NSEC |
398ca17f | 308 | |
f55a6faa JS |
309 | static inline void clock_was_set_delayed(void) { } |
310 | ||
54cdfdb4 TG |
311 | #endif |
312 | ||
203cbf77 TG |
313 | static inline ktime_t |
314 | __hrtimer_expires_remaining_adjusted(const struct hrtimer *timer, ktime_t now) | |
315 | { | |
316 | ktime_t rem = ktime_sub(timer->node.expires, now); | |
317 | ||
318 | /* | |
319 | * Adjust relative timers for the extra we added in | |
320 | * hrtimer_start_range_ns() to prevent short timeouts. | |
321 | */ | |
322 | if (IS_ENABLED(CONFIG_TIME_LOW_RES) && timer->is_rel) | |
2456e855 | 323 | rem -= hrtimer_resolution; |
203cbf77 TG |
324 | return rem; |
325 | } | |
326 | ||
327 | static inline ktime_t | |
328 | hrtimer_expires_remaining_adjusted(const struct hrtimer *timer) | |
329 | { | |
330 | return __hrtimer_expires_remaining_adjusted(timer, | |
331 | timer->base->get_time()); | |
332 | } | |
333 | ||
b12a03ce | 334 | extern void clock_was_set(void); |
9ec26907 TG |
335 | #ifdef CONFIG_TIMERFD |
336 | extern void timerfd_clock_was_set(void); | |
337 | #else | |
338 | static inline void timerfd_clock_was_set(void) { } | |
339 | #endif | |
b12a03ce TG |
340 | extern void hrtimers_resume(void); |
341 | ||
2e94d1f7 | 342 | DECLARE_PER_CPU(struct tick_device, tick_cpu_device); |
2e94d1f7 AV |
343 | |
344 | ||
c0a31329 TG |
345 | /* Exported timer functions: */ |
346 | ||
347 | /* Initialize timers: */ | |
7978672c GA |
348 | extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock, |
349 | enum hrtimer_mode mode); | |
dbc1625f SAS |
350 | extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, clockid_t clock_id, |
351 | enum hrtimer_mode mode); | |
c0a31329 | 352 | |
237fc6e7 TG |
353 | #ifdef CONFIG_DEBUG_OBJECTS_TIMERS |
354 | extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock, | |
355 | enum hrtimer_mode mode); | |
dbc1625f SAS |
356 | extern void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl, |
357 | clockid_t clock_id, | |
358 | enum hrtimer_mode mode); | |
237fc6e7 TG |
359 | |
360 | extern void destroy_hrtimer_on_stack(struct hrtimer *timer); | |
361 | #else | |
362 | static inline void hrtimer_init_on_stack(struct hrtimer *timer, | |
363 | clockid_t which_clock, | |
364 | enum hrtimer_mode mode) | |
365 | { | |
366 | hrtimer_init(timer, which_clock, mode); | |
367 | } | |
dbc1625f SAS |
368 | |
369 | static inline void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl, | |
370 | clockid_t clock_id, | |
371 | enum hrtimer_mode mode) | |
372 | { | |
373 | hrtimer_init_sleeper(sl, clock_id, mode); | |
374 | } | |
375 | ||
237fc6e7 TG |
376 | static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { } |
377 | #endif | |
378 | ||
c0a31329 | 379 | /* Basic timer operations: */ |
61699e13 | 380 | extern void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, |
da8b44d5 | 381 | u64 range_ns, const enum hrtimer_mode mode); |
7f1e2ca9 | 382 | |
02a171af | 383 | /** |
6de6250c | 384 | * hrtimer_start - (re)start an hrtimer |
02a171af TG |
385 | * @timer: the timer to be added |
386 | * @tim: expiry time | |
6de6250c | 387 | * @mode: timer mode: absolute (HRTIMER_MODE_ABS) or |
5da70160 AMG |
388 | * relative (HRTIMER_MODE_REL), and pinned (HRTIMER_MODE_PINNED); |
389 | * softirq based mode is considered for debug purpose only! | |
02a171af | 390 | */ |
61699e13 TG |
391 | static inline void hrtimer_start(struct hrtimer *timer, ktime_t tim, |
392 | const enum hrtimer_mode mode) | |
02a171af | 393 | { |
61699e13 | 394 | hrtimer_start_range_ns(timer, tim, 0, mode); |
02a171af TG |
395 | } |
396 | ||
c0a31329 TG |
397 | extern int hrtimer_cancel(struct hrtimer *timer); |
398 | extern int hrtimer_try_to_cancel(struct hrtimer *timer); | |
399 | ||
61699e13 TG |
400 | static inline void hrtimer_start_expires(struct hrtimer *timer, |
401 | enum hrtimer_mode mode) | |
63ca243b | 402 | { |
da8b44d5 | 403 | u64 delta; |
da8f2e17 AV |
404 | ktime_t soft, hard; |
405 | soft = hrtimer_get_softexpires(timer); | |
406 | hard = hrtimer_get_expires(timer); | |
407 | delta = ktime_to_ns(ktime_sub(hard, soft)); | |
61699e13 | 408 | hrtimer_start_range_ns(timer, soft, delta, mode); |
63ca243b AV |
409 | } |
410 | ||
01656464 TG |
411 | void hrtimer_sleeper_start_expires(struct hrtimer_sleeper *sl, |
412 | enum hrtimer_mode mode); | |
413 | ||
61699e13 | 414 | static inline void hrtimer_restart(struct hrtimer *timer) |
c9cb2e3d | 415 | { |
61699e13 | 416 | hrtimer_start_expires(timer, HRTIMER_MODE_ABS); |
c9cb2e3d | 417 | } |
c0a31329 TG |
418 | |
419 | /* Query timers: */ | |
203cbf77 TG |
420 | extern ktime_t __hrtimer_get_remaining(const struct hrtimer *timer, bool adjust); |
421 | ||
422 | static inline ktime_t hrtimer_get_remaining(const struct hrtimer *timer) | |
423 | { | |
424 | return __hrtimer_get_remaining(timer, false); | |
425 | } | |
c0a31329 | 426 | |
c1ad348b | 427 | extern u64 hrtimer_get_next_event(void); |
a59855cd | 428 | extern u64 hrtimer_next_event_without(const struct hrtimer *exclude); |
69239749 | 429 | |
887d9dc9 | 430 | extern bool hrtimer_active(const struct hrtimer *timer); |
c0a31329 | 431 | |
54cdfdb4 TG |
432 | /* |
433 | * Helper function to check, whether the timer is on one of the queues | |
434 | */ | |
435 | static inline int hrtimer_is_queued(struct hrtimer *timer) | |
436 | { | |
ca109491 | 437 | return timer->state & HRTIMER_STATE_ENQUEUED; |
54cdfdb4 TG |
438 | } |
439 | ||
4346f654 OH |
440 | /* |
441 | * Helper function to check, whether the timer is running the callback | |
442 | * function | |
443 | */ | |
444 | static inline int hrtimer_callback_running(struct hrtimer *timer) | |
445 | { | |
3f0b9e8e | 446 | return timer->base->running == timer; |
4346f654 OH |
447 | } |
448 | ||
c0a31329 | 449 | /* Forward a hrtimer so it expires after now: */ |
4d672e7a | 450 | extern u64 |
44f21475 | 451 | hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval); |
c0a31329 | 452 | |
91e5a217 TG |
453 | /** |
454 | * hrtimer_forward_now - forward the timer expiry so it expires after now | |
455 | * @timer: hrtimer to forward | |
456 | * @interval: the interval to forward | |
457 | * | |
458 | * Forward the timer expiry so it will expire after the current time | |
459 | * of the hrtimer clock base. Returns the number of overruns. | |
460 | * | |
461 | * Can be safely called from the callback function of @timer. If | |
462 | * called from other contexts @timer must neither be enqueued nor | |
463 | * running the callback and the caller needs to take care of | |
464 | * serialization. | |
465 | * | |
466 | * Note: This only updates the timer expiry value and does not requeue | |
467 | * the timer. | |
468 | */ | |
4d672e7a DL |
469 | static inline u64 hrtimer_forward_now(struct hrtimer *timer, |
470 | ktime_t interval) | |
5e05ad7d DL |
471 | { |
472 | return hrtimer_forward(timer, timer->base->get_time(), interval); | |
473 | } | |
474 | ||
10c94ec1 | 475 | /* Precise sleep: */ |
ce41aaf4 | 476 | |
c0edd7c9 | 477 | extern int nanosleep_copyout(struct restart_block *, struct timespec64 *); |
938e7cf2 | 478 | extern long hrtimer_nanosleep(const struct timespec64 *rqtp, |
10c94ec1 TG |
479 | const enum hrtimer_mode mode, |
480 | const clockid_t clockid); | |
481 | ||
da8b44d5 | 482 | extern int schedule_hrtimeout_range(ktime_t *expires, u64 delta, |
dbc1625f | 483 | const enum hrtimer_mode mode); |
351b3f7a | 484 | extern int schedule_hrtimeout_range_clock(ktime_t *expires, |
da8b44d5 JS |
485 | u64 delta, |
486 | const enum hrtimer_mode mode, | |
90777713 | 487 | clockid_t clock_id); |
7bb67439 AV |
488 | extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode); |
489 | ||
c0a31329 TG |
490 | /* Soft interrupt function to run the hrtimer queues: */ |
491 | extern void hrtimer_run_queues(void); | |
492 | ||
493 | /* Bootup initialization: */ | |
494 | extern void __init hrtimers_init(void); | |
495 | ||
88ad0bf6 IM |
496 | /* Show pending timers: */ |
497 | extern void sysrq_timer_list_show(void); | |
498 | ||
27590dc1 TG |
499 | int hrtimers_prepare_cpu(unsigned int cpu); |
500 | #ifdef CONFIG_HOTPLUG_CPU | |
501 | int hrtimers_dead_cpu(unsigned int cpu); | |
502 | #else | |
503 | #define hrtimers_dead_cpu NULL | |
504 | #endif | |
505 | ||
c0a31329 | 506 | #endif |