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Commit | Line | Data |
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c0a31329 TG |
1 | /* |
2 | * include/linux/hrtimer.h | |
3 | * | |
4 | * hrtimers - High-resolution kernel timers | |
5 | * | |
6 | * Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de> | |
7 | * Copyright(C) 2005, Red Hat, Inc., Ingo Molnar | |
8 | * | |
9 | * data type definitions, declarations, prototypes | |
10 | * | |
11 | * Started by: Thomas Gleixner and Ingo Molnar | |
12 | * | |
13 | * For licencing details see kernel-base/COPYING | |
14 | */ | |
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> | |
40b86062 | 22 | #include <linux/percpu.h> |
507e1231 | 23 | #include <linux/timer.h> |
998adc3d | 24 | #include <linux/timerqueue.h> |
c0a31329 | 25 | |
3c8aa39d TG |
26 | struct hrtimer_clock_base; |
27 | struct hrtimer_cpu_base; | |
28 | ||
c0a31329 TG |
29 | /* |
30 | * Mode arguments of xxx_hrtimer functions: | |
19b51cb5 AMG |
31 | * |
32 | * HRTIMER_MODE_ABS - Time value is absolute | |
33 | * HRTIMER_MODE_REL - Time value is relative to now | |
34 | * HRTIMER_MODE_PINNED - Timer is bound to CPU (is only considered | |
35 | * when starting the timer) | |
98ecadd4 AMG |
36 | * HRTIMER_MODE_SOFT - Timer callback function will be executed in |
37 | * soft irq context | |
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, |
19b51cb5 AMG |
44 | |
45 | HRTIMER_MODE_ABS_PINNED = HRTIMER_MODE_ABS | HRTIMER_MODE_PINNED, | |
46 | HRTIMER_MODE_REL_PINNED = HRTIMER_MODE_REL | HRTIMER_MODE_PINNED, | |
98ecadd4 AMG |
47 | |
48 | HRTIMER_MODE_ABS_SOFT = HRTIMER_MODE_ABS | HRTIMER_MODE_SOFT, | |
49 | HRTIMER_MODE_REL_SOFT = HRTIMER_MODE_REL | HRTIMER_MODE_SOFT, | |
50 | ||
51 | HRTIMER_MODE_ABS_PINNED_SOFT = HRTIMER_MODE_ABS_PINNED | HRTIMER_MODE_SOFT, | |
52 | HRTIMER_MODE_REL_PINNED_SOFT = HRTIMER_MODE_REL_PINNED | HRTIMER_MODE_SOFT, | |
53 | ||
c0a31329 TG |
54 | }; |
55 | ||
c9cb2e3d TG |
56 | /* |
57 | * Return values for the callback function | |
58 | */ | |
c0a31329 | 59 | enum hrtimer_restart { |
c9cb2e3d TG |
60 | HRTIMER_NORESTART, /* Timer is not restarted */ |
61 | HRTIMER_RESTART, /* Timer must be restarted */ | |
c0a31329 TG |
62 | }; |
63 | ||
54cdfdb4 TG |
64 | /* |
65 | * Values to track state of the timer | |
303e967f TG |
66 | * |
67 | * Possible states: | |
68 | * | |
69 | * 0x00 inactive | |
70 | * 0x01 enqueued into rbtree | |
54cdfdb4 | 71 | * |
887d9dc9 PZ |
72 | * The callback state is not part of the timer->state because clearing it would |
73 | * mean touching the timer after the callback, this makes it impossible to free | |
74 | * the timer from the callback function. | |
53370d2e | 75 | * |
887d9dc9 PZ |
76 | * Therefore we track the callback state in: |
77 | * | |
78 | * timer->base->cpu_base->running == timer | |
79 | * | |
80 | * On SMP it is possible to have a "callback function running and enqueued" | |
81 | * status. It happens for example when a posix timer expired and the callback | |
303e967f TG |
82 | * queued a signal. Between dropping the lock which protects the posix timer |
83 | * and reacquiring the base lock of the hrtimer, another CPU can deliver the | |
887d9dc9 | 84 | * signal and rearm the timer. |
303e967f TG |
85 | * |
86 | * All state transitions are protected by cpu_base->lock. | |
87 | */ | |
88 | #define HRTIMER_STATE_INACTIVE 0x00 | |
89 | #define HRTIMER_STATE_ENQUEUED 0x01 | |
303e967f | 90 | |
c0a31329 TG |
91 | /** |
92 | * struct hrtimer - the basic hrtimer structure | |
998adc3d JS |
93 | * @node: timerqueue node, which also manages node.expires, |
94 | * the absolute expiry time in the hrtimers internal | |
c0a31329 | 95 | * representation. The time is related to the clock on |
592aa999 TG |
96 | * which the timer is based. Is setup by adding |
97 | * slack to the _softexpires value. For non range timers | |
98 | * identical to _softexpires. | |
99 | * @_softexpires: the absolute earliest expiry time of the hrtimer. | |
100 | * The time which was given as expiry time when the timer | |
101 | * was armed. | |
c0a31329 | 102 | * @function: timer expiry callback function |
c0a31329 | 103 | * @base: pointer to the timer base (per cpu and per clock) |
303e967f | 104 | * @state: state information (See bit values above) |
203cbf77 | 105 | * @is_rel: Set if the timer was armed relative |
5da70160 | 106 | * @is_soft: Set if hrtimer will be expired in soft interrupt context. |
c0a31329 | 107 | * |
54cdfdb4 | 108 | * The hrtimer structure must be initialized by hrtimer_init() |
c0a31329 TG |
109 | */ |
110 | struct hrtimer { | |
998adc3d | 111 | struct timerqueue_node node; |
654c8e0b | 112 | ktime_t _softexpires; |
3c8aa39d TG |
113 | enum hrtimer_restart (*function)(struct hrtimer *); |
114 | struct hrtimer_clock_base *base; | |
203cbf77 TG |
115 | u8 state; |
116 | u8 is_rel; | |
5da70160 | 117 | u8 is_soft; |
c0a31329 TG |
118 | }; |
119 | ||
00362e33 TG |
120 | /** |
121 | * struct hrtimer_sleeper - simple sleeper structure | |
00362e33 TG |
122 | * @timer: embedded timer structure |
123 | * @task: task to wake up | |
124 | * | |
125 | * task is set to NULL, when the timer expires. | |
126 | */ | |
127 | struct hrtimer_sleeper { | |
128 | struct hrtimer timer; | |
129 | struct task_struct *task; | |
130 | }; | |
131 | ||
b8e38413 | 132 | #ifdef CONFIG_64BIT |
3f0b9e8e | 133 | # define __hrtimer_clock_base_align ____cacheline_aligned |
b8e38413 | 134 | #else |
3f0b9e8e | 135 | # define __hrtimer_clock_base_align |
b8e38413 TG |
136 | #endif |
137 | ||
c0a31329 | 138 | /** |
d1d67174 | 139 | * struct hrtimer_clock_base - the timer base for a specific clock |
05fb6bf0 | 140 | * @cpu_base: per cpu clock base |
3c8aa39d TG |
141 | * @index: clock type index for per_cpu support when moving a |
142 | * timer to a base on another cpu. | |
4d258b25 | 143 | * @clockid: clock id for per_cpu support |
3f0b9e8e AMG |
144 | * @seq: seqcount around __run_hrtimer |
145 | * @running: pointer to the currently running hrtimer | |
92127c7a | 146 | * @active: red black tree root node for the active timers |
92127c7a | 147 | * @get_time: function to retrieve the current time of the clock |
54cdfdb4 | 148 | * @offset: offset of this clock to the monotonic base |
c0a31329 | 149 | */ |
3c8aa39d TG |
150 | struct hrtimer_clock_base { |
151 | struct hrtimer_cpu_base *cpu_base; | |
3f0b9e8e | 152 | unsigned int index; |
ab8177bc | 153 | clockid_t clockid; |
3f0b9e8e AMG |
154 | seqcount_t seq; |
155 | struct hrtimer *running; | |
998adc3d | 156 | struct timerqueue_head active; |
c0a31329 | 157 | ktime_t (*get_time)(void); |
54cdfdb4 | 158 | ktime_t offset; |
3f0b9e8e | 159 | } __hrtimer_clock_base_align; |
3c8aa39d | 160 | |
e06383db | 161 | enum hrtimer_base_type { |
e06383db | 162 | HRTIMER_BASE_MONOTONIC, |
68fa61c0 | 163 | HRTIMER_BASE_REALTIME, |
a3ed0e43 | 164 | HRTIMER_BASE_BOOTTIME, |
90adda98 | 165 | HRTIMER_BASE_TAI, |
98ecadd4 AMG |
166 | HRTIMER_BASE_MONOTONIC_SOFT, |
167 | HRTIMER_BASE_REALTIME_SOFT, | |
a3ed0e43 | 168 | HRTIMER_BASE_BOOTTIME_SOFT, |
98ecadd4 | 169 | HRTIMER_BASE_TAI_SOFT, |
e06383db JS |
170 | HRTIMER_MAX_CLOCK_BASES, |
171 | }; | |
3c8aa39d | 172 | |
1fbc78b3 | 173 | /** |
3c8aa39d TG |
174 | * struct hrtimer_cpu_base - the per cpu clock bases |
175 | * @lock: lock protecting the base and associated clock bases | |
176 | * and timers | |
cddd0248 | 177 | * @cpu: cpu number |
ab8177bc | 178 | * @active_bases: Bitfield to mark bases with active timers |
868a3e91 | 179 | * @clock_was_set_seq: Sequence counter of clock was set events |
54cdfdb4 | 180 | * @hres_active: State of high resolution mode |
28bfd18b | 181 | * @in_hrtirq: hrtimer_interrupt() is currently executing |
41d2e494 | 182 | * @hang_detected: The last hrtimer interrupt detected a hang |
5da70160 AMG |
183 | * @softirq_activated: displays, if the softirq is raised - update of softirq |
184 | * related settings is not required then. | |
41d2e494 TG |
185 | * @nr_events: Total number of hrtimer interrupt events |
186 | * @nr_retries: Total number of hrtimer interrupt retries | |
187 | * @nr_hangs: Total number of hrtimer interrupt hangs | |
188 | * @max_hang_time: Maximum time spent in hrtimer_interrupt | |
07a9a7ea | 189 | * @expires_next: absolute time of the next event, is required for remote |
5da70160 AMG |
190 | * hrtimer enqueue; it is the total first expiry time (hard |
191 | * and soft hrtimer are taken into account) | |
eb27926b | 192 | * @next_timer: Pointer to the first expiring timer |
5da70160 AMG |
193 | * @softirq_expires_next: Time to check, if soft queues needs also to be expired |
194 | * @softirq_next_timer: Pointer to the first expiring softirq based timer | |
ab8177bc | 195 | * @clock_base: array of clock bases for this cpu |
895bdfa7 TG |
196 | * |
197 | * Note: next_timer is just an optimization for __remove_hrtimer(). | |
198 | * Do not dereference the pointer because it is not reliable on | |
199 | * cross cpu removals. | |
3c8aa39d TG |
200 | */ |
201 | struct hrtimer_cpu_base { | |
ecb49d1a | 202 | raw_spinlock_t lock; |
cddd0248 | 203 | unsigned int cpu; |
f55a6faa | 204 | unsigned int active_bases; |
868a3e91 | 205 | unsigned int clock_was_set_seq; |
5da70160 AMG |
206 | unsigned int hres_active : 1, |
207 | in_hrtirq : 1, | |
208 | hang_detected : 1, | |
209 | softirq_activated : 1; | |
11a9fe06 | 210 | #ifdef CONFIG_HIGH_RES_TIMERS |
a6ffebce | 211 | unsigned int nr_events; |
da21c5a5 AMG |
212 | unsigned short nr_retries; |
213 | unsigned short nr_hangs; | |
a6ffebce | 214 | unsigned int max_hang_time; |
54cdfdb4 | 215 | #endif |
07a9a7ea | 216 | ktime_t expires_next; |
eb27926b | 217 | struct hrtimer *next_timer; |
5da70160 AMG |
218 | ktime_t softirq_expires_next; |
219 | struct hrtimer *softirq_next_timer; | |
f24444b0 | 220 | struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES]; |
6d9a1411 | 221 | } ____cacheline_aligned; |
c0a31329 | 222 | |
63ca243b AV |
223 | static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time) |
224 | { | |
998adc3d | 225 | timer->node.expires = time; |
654c8e0b | 226 | timer->_softexpires = time; |
63ca243b | 227 | } |
654c8e0b AV |
228 | |
229 | static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta) | |
230 | { | |
231 | timer->_softexpires = time; | |
998adc3d | 232 | timer->node.expires = ktime_add_safe(time, delta); |
654c8e0b AV |
233 | } |
234 | ||
da8b44d5 | 235 | static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, u64 delta) |
654c8e0b AV |
236 | { |
237 | timer->_softexpires = time; | |
998adc3d | 238 | timer->node.expires = ktime_add_safe(time, ns_to_ktime(delta)); |
654c8e0b AV |
239 | } |
240 | ||
63ca243b AV |
241 | static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64) |
242 | { | |
2456e855 TG |
243 | timer->node.expires = tv64; |
244 | timer->_softexpires = tv64; | |
63ca243b AV |
245 | } |
246 | ||
247 | static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time) | |
248 | { | |
998adc3d | 249 | timer->node.expires = ktime_add_safe(timer->node.expires, time); |
654c8e0b | 250 | timer->_softexpires = ktime_add_safe(timer->_softexpires, time); |
63ca243b AV |
251 | } |
252 | ||
7597bc94 | 253 | static inline void hrtimer_add_expires_ns(struct hrtimer *timer, u64 ns) |
63ca243b | 254 | { |
998adc3d | 255 | timer->node.expires = ktime_add_ns(timer->node.expires, ns); |
654c8e0b | 256 | timer->_softexpires = ktime_add_ns(timer->_softexpires, ns); |
63ca243b AV |
257 | } |
258 | ||
259 | static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer) | |
260 | { | |
998adc3d | 261 | return timer->node.expires; |
63ca243b AV |
262 | } |
263 | ||
654c8e0b AV |
264 | static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer) |
265 | { | |
266 | return timer->_softexpires; | |
267 | } | |
268 | ||
63ca243b AV |
269 | static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer) |
270 | { | |
2456e855 | 271 | return timer->node.expires; |
63ca243b | 272 | } |
654c8e0b AV |
273 | static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer) |
274 | { | |
2456e855 | 275 | return timer->_softexpires; |
654c8e0b | 276 | } |
63ca243b AV |
277 | |
278 | static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer) | |
279 | { | |
998adc3d | 280 | return ktime_to_ns(timer->node.expires); |
63ca243b AV |
281 | } |
282 | ||
283 | static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer) | |
284 | { | |
998adc3d | 285 | return ktime_sub(timer->node.expires, timer->base->get_time()); |
63ca243b AV |
286 | } |
287 | ||
54cdfdb4 TG |
288 | static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer) |
289 | { | |
290 | return timer->base->get_time(); | |
291 | } | |
292 | ||
28bfd18b AMG |
293 | static inline int hrtimer_is_hres_active(struct hrtimer *timer) |
294 | { | |
295 | return IS_ENABLED(CONFIG_HIGH_RES_TIMERS) ? | |
296 | timer->base->cpu_base->hres_active : 0; | |
297 | } | |
298 | ||
21d6d52a TG |
299 | #ifdef CONFIG_HIGH_RES_TIMERS |
300 | struct clock_event_device; | |
301 | ||
302 | extern void hrtimer_interrupt(struct clock_event_device *dev); | |
303 | ||
54cdfdb4 TG |
304 | /* |
305 | * The resolution of the clocks. The resolution value is returned in | |
306 | * the clock_getres() system call to give application programmers an | |
307 | * idea of the (in)accuracy of timers. Timer values are rounded up to | |
308 | * this resolution values. | |
309 | */ | |
151db1fc | 310 | # define HIGH_RES_NSEC 1 |
2456e855 | 311 | # define KTIME_HIGH_RES (HIGH_RES_NSEC) |
151db1fc | 312 | # define MONOTONIC_RES_NSEC HIGH_RES_NSEC |
54cdfdb4 TG |
313 | # define KTIME_MONOTONIC_RES KTIME_HIGH_RES |
314 | ||
f55a6faa JS |
315 | extern void clock_was_set_delayed(void); |
316 | ||
398ca17f TG |
317 | extern unsigned int hrtimer_resolution; |
318 | ||
54cdfdb4 TG |
319 | #else |
320 | ||
151db1fc | 321 | # define MONOTONIC_RES_NSEC LOW_RES_NSEC |
54cdfdb4 TG |
322 | # define KTIME_MONOTONIC_RES KTIME_LOW_RES |
323 | ||
d711b8b3 | 324 | #define hrtimer_resolution (unsigned int)LOW_RES_NSEC |
398ca17f | 325 | |
f55a6faa JS |
326 | static inline void clock_was_set_delayed(void) { } |
327 | ||
54cdfdb4 TG |
328 | #endif |
329 | ||
203cbf77 TG |
330 | static inline ktime_t |
331 | __hrtimer_expires_remaining_adjusted(const struct hrtimer *timer, ktime_t now) | |
332 | { | |
333 | ktime_t rem = ktime_sub(timer->node.expires, now); | |
334 | ||
335 | /* | |
336 | * Adjust relative timers for the extra we added in | |
337 | * hrtimer_start_range_ns() to prevent short timeouts. | |
338 | */ | |
339 | if (IS_ENABLED(CONFIG_TIME_LOW_RES) && timer->is_rel) | |
2456e855 | 340 | rem -= hrtimer_resolution; |
203cbf77 TG |
341 | return rem; |
342 | } | |
343 | ||
344 | static inline ktime_t | |
345 | hrtimer_expires_remaining_adjusted(const struct hrtimer *timer) | |
346 | { | |
347 | return __hrtimer_expires_remaining_adjusted(timer, | |
348 | timer->base->get_time()); | |
349 | } | |
350 | ||
b12a03ce | 351 | extern void clock_was_set(void); |
9ec26907 TG |
352 | #ifdef CONFIG_TIMERFD |
353 | extern void timerfd_clock_was_set(void); | |
354 | #else | |
355 | static inline void timerfd_clock_was_set(void) { } | |
356 | #endif | |
b12a03ce TG |
357 | extern void hrtimers_resume(void); |
358 | ||
2e94d1f7 | 359 | DECLARE_PER_CPU(struct tick_device, tick_cpu_device); |
2e94d1f7 AV |
360 | |
361 | ||
c0a31329 TG |
362 | /* Exported timer functions: */ |
363 | ||
364 | /* Initialize timers: */ | |
7978672c GA |
365 | extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock, |
366 | enum hrtimer_mode mode); | |
c0a31329 | 367 | |
237fc6e7 TG |
368 | #ifdef CONFIG_DEBUG_OBJECTS_TIMERS |
369 | extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock, | |
370 | enum hrtimer_mode mode); | |
371 | ||
372 | extern void destroy_hrtimer_on_stack(struct hrtimer *timer); | |
373 | #else | |
374 | static inline void hrtimer_init_on_stack(struct hrtimer *timer, | |
375 | clockid_t which_clock, | |
376 | enum hrtimer_mode mode) | |
377 | { | |
378 | hrtimer_init(timer, which_clock, mode); | |
379 | } | |
380 | static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { } | |
381 | #endif | |
382 | ||
c0a31329 | 383 | /* Basic timer operations: */ |
61699e13 | 384 | extern void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, |
da8b44d5 | 385 | u64 range_ns, const enum hrtimer_mode mode); |
7f1e2ca9 | 386 | |
02a171af | 387 | /** |
6de6250c | 388 | * hrtimer_start - (re)start an hrtimer |
02a171af TG |
389 | * @timer: the timer to be added |
390 | * @tim: expiry time | |
6de6250c | 391 | * @mode: timer mode: absolute (HRTIMER_MODE_ABS) or |
5da70160 AMG |
392 | * relative (HRTIMER_MODE_REL), and pinned (HRTIMER_MODE_PINNED); |
393 | * softirq based mode is considered for debug purpose only! | |
02a171af | 394 | */ |
61699e13 TG |
395 | static inline void hrtimer_start(struct hrtimer *timer, ktime_t tim, |
396 | const enum hrtimer_mode mode) | |
02a171af | 397 | { |
61699e13 | 398 | hrtimer_start_range_ns(timer, tim, 0, mode); |
02a171af TG |
399 | } |
400 | ||
c0a31329 TG |
401 | extern int hrtimer_cancel(struct hrtimer *timer); |
402 | extern int hrtimer_try_to_cancel(struct hrtimer *timer); | |
403 | ||
61699e13 TG |
404 | static inline void hrtimer_start_expires(struct hrtimer *timer, |
405 | enum hrtimer_mode mode) | |
63ca243b | 406 | { |
da8b44d5 | 407 | u64 delta; |
da8f2e17 AV |
408 | ktime_t soft, hard; |
409 | soft = hrtimer_get_softexpires(timer); | |
410 | hard = hrtimer_get_expires(timer); | |
411 | delta = ktime_to_ns(ktime_sub(hard, soft)); | |
61699e13 | 412 | hrtimer_start_range_ns(timer, soft, delta, mode); |
63ca243b AV |
413 | } |
414 | ||
61699e13 | 415 | static inline void hrtimer_restart(struct hrtimer *timer) |
c9cb2e3d | 416 | { |
61699e13 | 417 | hrtimer_start_expires(timer, HRTIMER_MODE_ABS); |
c9cb2e3d | 418 | } |
c0a31329 TG |
419 | |
420 | /* Query timers: */ | |
203cbf77 TG |
421 | extern ktime_t __hrtimer_get_remaining(const struct hrtimer *timer, bool adjust); |
422 | ||
423 | static inline ktime_t hrtimer_get_remaining(const struct hrtimer *timer) | |
424 | { | |
425 | return __hrtimer_get_remaining(timer, false); | |
426 | } | |
c0a31329 | 427 | |
c1ad348b | 428 | extern u64 hrtimer_get_next_event(void); |
a59855cd | 429 | extern u64 hrtimer_next_event_without(const struct hrtimer *exclude); |
69239749 | 430 | |
887d9dc9 | 431 | extern bool hrtimer_active(const struct hrtimer *timer); |
c0a31329 | 432 | |
54cdfdb4 TG |
433 | /* |
434 | * Helper function to check, whether the timer is on one of the queues | |
435 | */ | |
436 | static inline int hrtimer_is_queued(struct hrtimer *timer) | |
437 | { | |
ca109491 | 438 | return timer->state & HRTIMER_STATE_ENQUEUED; |
54cdfdb4 TG |
439 | } |
440 | ||
4346f654 OH |
441 | /* |
442 | * Helper function to check, whether the timer is running the callback | |
443 | * function | |
444 | */ | |
445 | static inline int hrtimer_callback_running(struct hrtimer *timer) | |
446 | { | |
3f0b9e8e | 447 | return timer->base->running == timer; |
4346f654 OH |
448 | } |
449 | ||
c0a31329 | 450 | /* Forward a hrtimer so it expires after now: */ |
4d672e7a | 451 | extern u64 |
44f21475 | 452 | hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval); |
c0a31329 | 453 | |
91e5a217 TG |
454 | /** |
455 | * hrtimer_forward_now - forward the timer expiry so it expires after now | |
456 | * @timer: hrtimer to forward | |
457 | * @interval: the interval to forward | |
458 | * | |
459 | * Forward the timer expiry so it will expire after the current time | |
460 | * of the hrtimer clock base. Returns the number of overruns. | |
461 | * | |
462 | * Can be safely called from the callback function of @timer. If | |
463 | * called from other contexts @timer must neither be enqueued nor | |
464 | * running the callback and the caller needs to take care of | |
465 | * serialization. | |
466 | * | |
467 | * Note: This only updates the timer expiry value and does not requeue | |
468 | * the timer. | |
469 | */ | |
4d672e7a DL |
470 | static inline u64 hrtimer_forward_now(struct hrtimer *timer, |
471 | ktime_t interval) | |
5e05ad7d DL |
472 | { |
473 | return hrtimer_forward(timer, timer->base->get_time(), interval); | |
474 | } | |
475 | ||
10c94ec1 | 476 | /* Precise sleep: */ |
ce41aaf4 | 477 | |
c0edd7c9 | 478 | extern int nanosleep_copyout(struct restart_block *, struct timespec64 *); |
938e7cf2 | 479 | extern long hrtimer_nanosleep(const struct timespec64 *rqtp, |
10c94ec1 TG |
480 | const enum hrtimer_mode mode, |
481 | const clockid_t clockid); | |
482 | ||
00362e33 TG |
483 | extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, |
484 | struct task_struct *tsk); | |
485 | ||
da8b44d5 | 486 | extern int schedule_hrtimeout_range(ktime_t *expires, u64 delta, |
654c8e0b | 487 | const enum hrtimer_mode mode); |
351b3f7a | 488 | extern int schedule_hrtimeout_range_clock(ktime_t *expires, |
da8b44d5 JS |
489 | u64 delta, |
490 | const enum hrtimer_mode mode, | |
90777713 | 491 | clockid_t clock_id); |
7bb67439 AV |
492 | extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode); |
493 | ||
c0a31329 TG |
494 | /* Soft interrupt function to run the hrtimer queues: */ |
495 | extern void hrtimer_run_queues(void); | |
496 | ||
497 | /* Bootup initialization: */ | |
498 | extern void __init hrtimers_init(void); | |
499 | ||
88ad0bf6 IM |
500 | /* Show pending timers: */ |
501 | extern void sysrq_timer_list_show(void); | |
502 | ||
27590dc1 TG |
503 | int hrtimers_prepare_cpu(unsigned int cpu); |
504 | #ifdef CONFIG_HOTPLUG_CPU | |
505 | int hrtimers_dead_cpu(unsigned int cpu); | |
506 | #else | |
507 | #define hrtimers_dead_cpu NULL | |
508 | #endif | |
509 | ||
c0a31329 | 510 | #endif |