| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 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 |
| 11 | */ |
| 12 | #ifndef _LINUX_HRTIMER_H |
| 13 | #define _LINUX_HRTIMER_H |
| 14 | |
| 15 | #include <linux/hrtimer_defs.h> |
| 16 | #include <linux/rbtree.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/list.h> |
| 19 | #include <linux/percpu.h> |
| 20 | #include <linux/seqlock.h> |
| 21 | #include <linux/timer.h> |
| 22 | #include <linux/timerqueue.h> |
| 23 | |
| 24 | struct hrtimer_clock_base; |
| 25 | struct hrtimer_cpu_base; |
| 26 | |
| 27 | /* |
| 28 | * Mode arguments of xxx_hrtimer functions: |
| 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) |
| 34 | * HRTIMER_MODE_SOFT - Timer callback function will be executed in |
| 35 | * soft irq context |
| 36 | * HRTIMER_MODE_HARD - Timer callback function will be executed in |
| 37 | * hard irq context even on PREEMPT_RT. |
| 38 | */ |
| 39 | enum hrtimer_mode { |
| 40 | HRTIMER_MODE_ABS = 0x00, |
| 41 | HRTIMER_MODE_REL = 0x01, |
| 42 | HRTIMER_MODE_PINNED = 0x02, |
| 43 | HRTIMER_MODE_SOFT = 0x04, |
| 44 | HRTIMER_MODE_HARD = 0x08, |
| 45 | |
| 46 | HRTIMER_MODE_ABS_PINNED = HRTIMER_MODE_ABS | HRTIMER_MODE_PINNED, |
| 47 | HRTIMER_MODE_REL_PINNED = HRTIMER_MODE_REL | HRTIMER_MODE_PINNED, |
| 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 | |
| 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, |
| 60 | }; |
| 61 | |
| 62 | /* |
| 63 | * Return values for the callback function |
| 64 | */ |
| 65 | enum hrtimer_restart { |
| 66 | HRTIMER_NORESTART, /* Timer is not restarted */ |
| 67 | HRTIMER_RESTART, /* Timer must be restarted */ |
| 68 | }; |
| 69 | |
| 70 | /* |
| 71 | * Values to track state of the timer |
| 72 | * |
| 73 | * Possible states: |
| 74 | * |
| 75 | * 0x00 inactive |
| 76 | * 0x01 enqueued into rbtree |
| 77 | * |
| 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. |
| 81 | * |
| 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 |
| 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 |
| 90 | * signal and rearm the timer. |
| 91 | * |
| 92 | * All state transitions are protected by cpu_base->lock. |
| 93 | */ |
| 94 | #define HRTIMER_STATE_INACTIVE 0x00 |
| 95 | #define HRTIMER_STATE_ENQUEUED 0x01 |
| 96 | |
| 97 | /** |
| 98 | * struct hrtimer - the basic hrtimer structure |
| 99 | * @node: timerqueue node, which also manages node.expires, |
| 100 | * the absolute expiry time in the hrtimers internal |
| 101 | * representation. The time is related to the clock on |
| 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. |
| 108 | * @function: timer expiry callback function |
| 109 | * @base: pointer to the timer base (per cpu and per clock) |
| 110 | * @state: state information (See bit values above) |
| 111 | * @is_rel: Set if the timer was armed relative |
| 112 | * @is_soft: Set if hrtimer will be expired in soft interrupt context. |
| 113 | * @is_hard: Set if hrtimer will be expired in hard interrupt context |
| 114 | * even on RT. |
| 115 | * |
| 116 | * The hrtimer structure must be initialized by hrtimer_init() |
| 117 | */ |
| 118 | struct hrtimer { |
| 119 | struct timerqueue_node node; |
| 120 | ktime_t _softexpires; |
| 121 | enum hrtimer_restart (*function)(struct hrtimer *); |
| 122 | struct hrtimer_clock_base *base; |
| 123 | u8 state; |
| 124 | u8 is_rel; |
| 125 | u8 is_soft; |
| 126 | u8 is_hard; |
| 127 | }; |
| 128 | |
| 129 | /** |
| 130 | * struct hrtimer_sleeper - simple sleeper structure |
| 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 | |
| 141 | #ifdef CONFIG_64BIT |
| 142 | # define __hrtimer_clock_base_align ____cacheline_aligned |
| 143 | #else |
| 144 | # define __hrtimer_clock_base_align |
| 145 | #endif |
| 146 | |
| 147 | /** |
| 148 | * struct hrtimer_clock_base - the timer base for a specific clock |
| 149 | * @cpu_base: per cpu clock base |
| 150 | * @index: clock type index for per_cpu support when moving a |
| 151 | * timer to a base on another cpu. |
| 152 | * @clockid: clock id for per_cpu support |
| 153 | * @seq: seqcount around __run_hrtimer |
| 154 | * @running: pointer to the currently running hrtimer |
| 155 | * @active: red black tree root node for the active timers |
| 156 | * @get_time: function to retrieve the current time of the clock |
| 157 | * @offset: offset of this clock to the monotonic base |
| 158 | */ |
| 159 | struct hrtimer_clock_base { |
| 160 | struct hrtimer_cpu_base *cpu_base; |
| 161 | unsigned int index; |
| 162 | clockid_t clockid; |
| 163 | seqcount_raw_spinlock_t seq; |
| 164 | struct hrtimer *running; |
| 165 | struct timerqueue_head active; |
| 166 | ktime_t (*get_time)(void); |
| 167 | ktime_t offset; |
| 168 | } __hrtimer_clock_base_align; |
| 169 | |
| 170 | enum hrtimer_base_type { |
| 171 | HRTIMER_BASE_MONOTONIC, |
| 172 | HRTIMER_BASE_REALTIME, |
| 173 | HRTIMER_BASE_BOOTTIME, |
| 174 | HRTIMER_BASE_TAI, |
| 175 | HRTIMER_BASE_MONOTONIC_SOFT, |
| 176 | HRTIMER_BASE_REALTIME_SOFT, |
| 177 | HRTIMER_BASE_BOOTTIME_SOFT, |
| 178 | HRTIMER_BASE_TAI_SOFT, |
| 179 | HRTIMER_MAX_CLOCK_BASES, |
| 180 | }; |
| 181 | |
| 182 | /** |
| 183 | * struct hrtimer_cpu_base - the per cpu clock bases |
| 184 | * @lock: lock protecting the base and associated clock bases |
| 185 | * and timers |
| 186 | * @cpu: cpu number |
| 187 | * @active_bases: Bitfield to mark bases with active timers |
| 188 | * @clock_was_set_seq: Sequence counter of clock was set events |
| 189 | * @hres_active: State of high resolution mode |
| 190 | * @in_hrtirq: hrtimer_interrupt() is currently executing |
| 191 | * @hang_detected: The last hrtimer interrupt detected a hang |
| 192 | * @softirq_activated: displays, if the softirq is raised - update of softirq |
| 193 | * related settings is not required then. |
| 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 |
| 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. |
| 202 | * @expires_next: absolute time of the next event, is required for remote |
| 203 | * hrtimer enqueue; it is the total first expiry time (hard |
| 204 | * and soft hrtimer are taken into account) |
| 205 | * @next_timer: Pointer to the first expiring timer |
| 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 |
| 208 | * @clock_base: array of clock bases for this cpu |
| 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. |
| 213 | */ |
| 214 | struct hrtimer_cpu_base { |
| 215 | raw_spinlock_t lock; |
| 216 | unsigned int cpu; |
| 217 | unsigned int active_bases; |
| 218 | unsigned int clock_was_set_seq; |
| 219 | unsigned int hres_active : 1, |
| 220 | in_hrtirq : 1, |
| 221 | hang_detected : 1, |
| 222 | softirq_activated : 1; |
| 223 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 224 | unsigned int nr_events; |
| 225 | unsigned short nr_retries; |
| 226 | unsigned short nr_hangs; |
| 227 | unsigned int max_hang_time; |
| 228 | #endif |
| 229 | #ifdef CONFIG_PREEMPT_RT |
| 230 | spinlock_t softirq_expiry_lock; |
| 231 | atomic_t timer_waiters; |
| 232 | #endif |
| 233 | ktime_t expires_next; |
| 234 | struct hrtimer *next_timer; |
| 235 | ktime_t softirq_expires_next; |
| 236 | struct hrtimer *softirq_next_timer; |
| 237 | struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES]; |
| 238 | } ____cacheline_aligned; |
| 239 | |
| 240 | static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time) |
| 241 | { |
| 242 | timer->node.expires = time; |
| 243 | timer->_softexpires = time; |
| 244 | } |
| 245 | |
| 246 | static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta) |
| 247 | { |
| 248 | timer->_softexpires = time; |
| 249 | timer->node.expires = ktime_add_safe(time, delta); |
| 250 | } |
| 251 | |
| 252 | static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, u64 delta) |
| 253 | { |
| 254 | timer->_softexpires = time; |
| 255 | timer->node.expires = ktime_add_safe(time, ns_to_ktime(delta)); |
| 256 | } |
| 257 | |
| 258 | static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64) |
| 259 | { |
| 260 | timer->node.expires = tv64; |
| 261 | timer->_softexpires = tv64; |
| 262 | } |
| 263 | |
| 264 | static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time) |
| 265 | { |
| 266 | timer->node.expires = ktime_add_safe(timer->node.expires, time); |
| 267 | timer->_softexpires = ktime_add_safe(timer->_softexpires, time); |
| 268 | } |
| 269 | |
| 270 | static inline void hrtimer_add_expires_ns(struct hrtimer *timer, u64 ns) |
| 271 | { |
| 272 | timer->node.expires = ktime_add_ns(timer->node.expires, ns); |
| 273 | timer->_softexpires = ktime_add_ns(timer->_softexpires, ns); |
| 274 | } |
| 275 | |
| 276 | static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer) |
| 277 | { |
| 278 | return timer->node.expires; |
| 279 | } |
| 280 | |
| 281 | static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer) |
| 282 | { |
| 283 | return timer->_softexpires; |
| 284 | } |
| 285 | |
| 286 | static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer) |
| 287 | { |
| 288 | return timer->node.expires; |
| 289 | } |
| 290 | static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer) |
| 291 | { |
| 292 | return timer->_softexpires; |
| 293 | } |
| 294 | |
| 295 | static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer) |
| 296 | { |
| 297 | return ktime_to_ns(timer->node.expires); |
| 298 | } |
| 299 | |
| 300 | static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer) |
| 301 | { |
| 302 | return ktime_sub(timer->node.expires, timer->base->get_time()); |
| 303 | } |
| 304 | |
| 305 | static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer) |
| 306 | { |
| 307 | return timer->base->get_time(); |
| 308 | } |
| 309 | |
| 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 | |
| 316 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 317 | struct clock_event_device; |
| 318 | |
| 319 | extern void hrtimer_interrupt(struct clock_event_device *dev); |
| 320 | |
| 321 | extern unsigned int hrtimer_resolution; |
| 322 | |
| 323 | #else |
| 324 | |
| 325 | #define hrtimer_resolution (unsigned int)LOW_RES_NSEC |
| 326 | |
| 327 | #endif |
| 328 | |
| 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) |
| 339 | rem -= hrtimer_resolution; |
| 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 | |
| 350 | #ifdef CONFIG_TIMERFD |
| 351 | extern void timerfd_clock_was_set(void); |
| 352 | extern void timerfd_resume(void); |
| 353 | #else |
| 354 | static inline void timerfd_clock_was_set(void) { } |
| 355 | static inline void timerfd_resume(void) { } |
| 356 | #endif |
| 357 | |
| 358 | DECLARE_PER_CPU(struct tick_device, tick_cpu_device); |
| 359 | |
| 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 |
| 368 | |
| 369 | /* Exported timer functions: */ |
| 370 | |
| 371 | /* Initialize timers: */ |
| 372 | extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock, |
| 373 | enum hrtimer_mode mode); |
| 374 | extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, clockid_t clock_id, |
| 375 | enum hrtimer_mode mode); |
| 376 | |
| 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); |
| 380 | extern void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl, |
| 381 | clockid_t clock_id, |
| 382 | enum hrtimer_mode mode); |
| 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 | } |
| 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 | |
| 400 | static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { } |
| 401 | #endif |
| 402 | |
| 403 | /* Basic timer operations: */ |
| 404 | extern void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, |
| 405 | u64 range_ns, const enum hrtimer_mode mode); |
| 406 | |
| 407 | /** |
| 408 | * hrtimer_start - (re)start an hrtimer |
| 409 | * @timer: the timer to be added |
| 410 | * @tim: expiry time |
| 411 | * @mode: timer mode: absolute (HRTIMER_MODE_ABS) or |
| 412 | * relative (HRTIMER_MODE_REL), and pinned (HRTIMER_MODE_PINNED); |
| 413 | * softirq based mode is considered for debug purpose only! |
| 414 | */ |
| 415 | static inline void hrtimer_start(struct hrtimer *timer, ktime_t tim, |
| 416 | const enum hrtimer_mode mode) |
| 417 | { |
| 418 | hrtimer_start_range_ns(timer, tim, 0, mode); |
| 419 | } |
| 420 | |
| 421 | extern int hrtimer_cancel(struct hrtimer *timer); |
| 422 | extern int hrtimer_try_to_cancel(struct hrtimer *timer); |
| 423 | |
| 424 | static inline void hrtimer_start_expires(struct hrtimer *timer, |
| 425 | enum hrtimer_mode mode) |
| 426 | { |
| 427 | u64 delta; |
| 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)); |
| 432 | hrtimer_start_range_ns(timer, soft, delta, mode); |
| 433 | } |
| 434 | |
| 435 | void hrtimer_sleeper_start_expires(struct hrtimer_sleeper *sl, |
| 436 | enum hrtimer_mode mode); |
| 437 | |
| 438 | static inline void hrtimer_restart(struct hrtimer *timer) |
| 439 | { |
| 440 | hrtimer_start_expires(timer, HRTIMER_MODE_ABS); |
| 441 | } |
| 442 | |
| 443 | /* Query timers: */ |
| 444 | extern ktime_t __hrtimer_get_remaining(const struct hrtimer *timer, bool adjust); |
| 445 | |
| 446 | /** |
| 447 | * hrtimer_get_remaining - get remaining time for the timer |
| 448 | * @timer: the timer to read |
| 449 | */ |
| 450 | static inline ktime_t hrtimer_get_remaining(const struct hrtimer *timer) |
| 451 | { |
| 452 | return __hrtimer_get_remaining(timer, false); |
| 453 | } |
| 454 | |
| 455 | extern u64 hrtimer_get_next_event(void); |
| 456 | extern u64 hrtimer_next_event_without(const struct hrtimer *exclude); |
| 457 | |
| 458 | extern bool hrtimer_active(const struct hrtimer *timer); |
| 459 | |
| 460 | /** |
| 461 | * hrtimer_is_queued - check, whether the timer is on one of the queues |
| 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. |
| 467 | */ |
| 468 | static inline bool hrtimer_is_queued(struct hrtimer *timer) |
| 469 | { |
| 470 | /* The READ_ONCE pairs with the update functions of timer->state */ |
| 471 | return !!(READ_ONCE(timer->state) & HRTIMER_STATE_ENQUEUED); |
| 472 | } |
| 473 | |
| 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 | { |
| 480 | return timer->base->running == timer; |
| 481 | } |
| 482 | |
| 483 | /* Forward a hrtimer so it expires after now: */ |
| 484 | extern u64 |
| 485 | hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval); |
| 486 | |
| 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 | */ |
| 503 | static inline u64 hrtimer_forward_now(struct hrtimer *timer, |
| 504 | ktime_t interval) |
| 505 | { |
| 506 | return hrtimer_forward(timer, timer->base->get_time(), interval); |
| 507 | } |
| 508 | |
| 509 | /* Precise sleep: */ |
| 510 | |
| 511 | extern int nanosleep_copyout(struct restart_block *, struct timespec64 *); |
| 512 | extern long hrtimer_nanosleep(ktime_t rqtp, const enum hrtimer_mode mode, |
| 513 | const clockid_t clockid); |
| 514 | |
| 515 | extern int schedule_hrtimeout_range(ktime_t *expires, u64 delta, |
| 516 | const enum hrtimer_mode mode); |
| 517 | extern int schedule_hrtimeout_range_clock(ktime_t *expires, |
| 518 | u64 delta, |
| 519 | const enum hrtimer_mode mode, |
| 520 | clockid_t clock_id); |
| 521 | extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode); |
| 522 | |
| 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 | |
| 529 | /* Show pending timers: */ |
| 530 | extern void sysrq_timer_list_show(void); |
| 531 | |
| 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 | |
| 539 | #endif |