wait.h revision 330861
1219820Sjeff/*- 2219820Sjeff * Copyright (c) 2010 Isilon Systems, Inc. 3219820Sjeff * Copyright (c) 2010 iX Systems, Inc. 4219820Sjeff * Copyright (c) 2010 Panasas, Inc. 5270710Shselasky * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. 6328653Shselasky * Copyright (c) 2017 Mark Johnston <markj@FreeBSD.org> 7219820Sjeff * All rights reserved. 8219820Sjeff * 9219820Sjeff * Redistribution and use in source and binary forms, with or without 10219820Sjeff * modification, are permitted provided that the following conditions 11219820Sjeff * are met: 12219820Sjeff * 1. Redistributions of source code must retain the above copyright 13219820Sjeff * notice unmodified, this list of conditions, and the following 14219820Sjeff * disclaimer. 15219820Sjeff * 2. Redistributions in binary form must reproduce the above copyright 16219820Sjeff * notice, this list of conditions and the following disclaimer in the 17219820Sjeff * documentation and/or other materials provided with the distribution. 18219820Sjeff * 19219820Sjeff * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20219820Sjeff * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21219820Sjeff * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22219820Sjeff * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23219820Sjeff * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24219820Sjeff * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25219820Sjeff * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26219820Sjeff * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27219820Sjeff * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28219820Sjeff * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29289644Shselasky * 30289644Shselasky * $FreeBSD: stable/11/sys/compat/linuxkpi/common/include/linux/wait.h 330861 2018-03-13 16:30:01Z hselasky $ 31219820Sjeff */ 32328653Shselasky 33328653Shselasky#ifndef _LINUX_WAIT_H_ 34219820Sjeff#define _LINUX_WAIT_H_ 35219820Sjeff 36300671Shselasky#include <linux/compiler.h> 37328653Shselasky#include <linux/list.h> 38219820Sjeff#include <linux/spinlock.h> 39219820Sjeff 40328653Shselasky#include <asm/atomic.h> 41328653Shselasky 42219820Sjeff#include <sys/param.h> 43219820Sjeff#include <sys/systm.h> 44219820Sjeff 45328653Shselasky#define SKIP_SLEEP() (SCHEDULER_STOPPED() || kdb_active) 46289564Shselasky 47328653Shselasky#define might_sleep() \ 48328653Shselasky WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "might_sleep()") 49219820Sjeff 50328653Shselaskystruct wait_queue; 51328653Shselaskystruct wait_queue_head; 52219820Sjeff 53328653Shselaskytypedef struct wait_queue wait_queue_t; 54328653Shselaskytypedef struct wait_queue_head wait_queue_head_t; 55219820Sjeff 56328653Shselaskytypedef int wait_queue_func_t(wait_queue_t *, unsigned int, int, void *); 57219820Sjeff 58328653Shselasky/* 59328653Shselasky * Many API consumers directly reference these fields and those of 60328653Shselasky * wait_queue_head. 61328653Shselasky */ 62328653Shselaskystruct wait_queue { 63328653Shselasky unsigned int flags; /* always 0 */ 64328653Shselasky void *private; 65328653Shselasky wait_queue_func_t *func; 66328653Shselasky struct list_head task_list; 67328653Shselasky}; 68219820Sjeff 69328653Shselaskystruct wait_queue_head { 70328653Shselasky spinlock_t lock; 71328653Shselasky struct list_head task_list; 72328653Shselasky}; 73328653Shselasky 74328653Shselasky/* 75328653Shselasky * This function is referenced by at least one DRM driver, so it may not be 76328653Shselasky * renamed and furthermore must be the default wait queue callback. 77328653Shselasky */ 78328653Shselaskyextern wait_queue_func_t autoremove_wake_function; 79330861Shselaskyextern wait_queue_func_t default_wake_function; 80328653Shselasky 81330861Shselasky#define DEFINE_WAIT_FUNC(name, function) \ 82328653Shselasky wait_queue_t name = { \ 83328653Shselasky .private = current, \ 84330861Shselasky .func = function, \ 85328653Shselasky .task_list = LINUX_LIST_HEAD_INIT(name.task_list) \ 86328653Shselasky } 87328653Shselasky 88330861Shselasky#define DEFINE_WAIT(name) \ 89330861Shselasky DEFINE_WAIT_FUNC(name, autoremove_wake_function) 90330861Shselasky 91328653Shselasky#define DECLARE_WAITQUEUE(name, task) \ 92328653Shselasky wait_queue_t name = { \ 93328653Shselasky .private = task, \ 94328653Shselasky .task_list = LINUX_LIST_HEAD_INIT(name.task_list) \ 95328653Shselasky } 96328653Shselasky 97328653Shselasky#define DECLARE_WAIT_QUEUE_HEAD(name) \ 98328653Shselasky wait_queue_head_t name = { \ 99328653Shselasky .task_list = LINUX_LIST_HEAD_INIT(name.task_list), \ 100328653Shselasky }; \ 101328653Shselasky MTX_SYSINIT(name, &(name).lock.m, spin_lock_name("wqhead"), MTX_DEF) 102328653Shselasky 103328653Shselasky#define init_waitqueue_head(wqh) do { \ 104328653Shselasky mtx_init(&(wqh)->lock.m, spin_lock_name("wqhead"), \ 105328653Shselasky NULL, MTX_DEF | MTX_NEW | MTX_NOWITNESS); \ 106328653Shselasky INIT_LIST_HEAD(&(wqh)->task_list); \ 107219820Sjeff} while (0) 108219820Sjeff 109328653Shselaskyvoid linux_wake_up(wait_queue_head_t *, unsigned int, int, bool); 110328653Shselasky 111328653Shselasky#define wake_up(wqh) \ 112328653Shselasky linux_wake_up(wqh, TASK_NORMAL, 1, false) 113328653Shselasky#define wake_up_all(wqh) \ 114328653Shselasky linux_wake_up(wqh, TASK_NORMAL, 0, false) 115328653Shselasky#define wake_up_locked(wqh) \ 116328653Shselasky linux_wake_up(wqh, TASK_NORMAL, 1, true) 117328653Shselasky#define wake_up_all_locked(wqh) \ 118328653Shselasky linux_wake_up(wqh, TASK_NORMAL, 0, true) 119328653Shselasky#define wake_up_interruptible(wqh) \ 120328653Shselasky linux_wake_up(wqh, TASK_INTERRUPTIBLE, 1, false) 121328653Shselasky#define wake_up_interruptible_all(wqh) \ 122328653Shselasky linux_wake_up(wqh, TASK_INTERRUPTIBLE, 0, false) 123328653Shselasky 124328653Shselaskyint linux_wait_event_common(wait_queue_head_t *, wait_queue_t *, int, 125328653Shselasky unsigned int, spinlock_t *); 126328653Shselasky 127328653Shselasky/* 128328653Shselasky * Returns -ERESTARTSYS for a signal, 0 if cond is false after timeout, 1 if 129328653Shselasky * cond is true after timeout, remaining jiffies (> 0) if cond is true before 130328653Shselasky * timeout. 131328653Shselasky */ 132328653Shselasky#define __wait_event_common(wqh, cond, timeout, state, lock) ({ \ 133328653Shselasky DEFINE_WAIT(__wq); \ 134328653Shselasky const int __timeout = ((int)(timeout)) < 1 ? 1 : (timeout); \ 135328653Shselasky int __start = ticks; \ 136328653Shselasky int __ret = 0; \ 137328653Shselasky \ 138328653Shselasky for (;;) { \ 139328653Shselasky linux_prepare_to_wait(&(wqh), &__wq, state); \ 140328653Shselasky if (cond) \ 141328653Shselasky break; \ 142328653Shselasky __ret = linux_wait_event_common(&(wqh), &__wq, \ 143328653Shselasky __timeout, state, lock); \ 144328653Shselasky if (__ret != 0) \ 145328653Shselasky break; \ 146328653Shselasky } \ 147328653Shselasky linux_finish_wait(&(wqh), &__wq); \ 148328653Shselasky if (__timeout != MAX_SCHEDULE_TIMEOUT) { \ 149328653Shselasky if (__ret == -EWOULDBLOCK) \ 150328653Shselasky __ret = !!(cond); \ 151328653Shselasky else if (__ret != -ERESTARTSYS) { \ 152328653Shselasky __ret = __timeout + __start - ticks; \ 153328653Shselasky /* range check return value */ \ 154328653Shselasky if (__ret < 1) \ 155328653Shselasky __ret = 1; \ 156328653Shselasky else if (__ret > __timeout) \ 157328653Shselasky __ret = __timeout; \ 158328653Shselasky } \ 159328653Shselasky } \ 160328653Shselasky __ret; \ 161219820Sjeff}) 162219820Sjeff 163328653Shselasky#define wait_event(wqh, cond) do { \ 164328653Shselasky (void) __wait_event_common(wqh, cond, MAX_SCHEDULE_TIMEOUT, \ 165328653Shselasky TASK_UNINTERRUPTIBLE, NULL); \ 166328653Shselasky} while (0) 167328653Shselasky 168328653Shselasky#define wait_event_timeout(wqh, cond, timeout) ({ \ 169328653Shselasky __wait_event_common(wqh, cond, timeout, TASK_UNINTERRUPTIBLE, \ 170328653Shselasky NULL); \ 171328653Shselasky}) 172328653Shselasky 173328653Shselasky#define wait_event_interruptible(wqh, cond) ({ \ 174328653Shselasky __wait_event_common(wqh, cond, MAX_SCHEDULE_TIMEOUT, \ 175328653Shselasky TASK_INTERRUPTIBLE, NULL); \ 176328653Shselasky}) 177328653Shselasky 178328653Shselasky#define wait_event_interruptible_timeout(wqh, cond, timeout) ({ \ 179328653Shselasky __wait_event_common(wqh, cond, timeout, TASK_INTERRUPTIBLE, \ 180328653Shselasky NULL); \ 181328653Shselasky}) 182328653Shselasky 183328653Shselasky/* 184328653Shselasky * Wait queue is already locked. 185328653Shselasky */ 186328653Shselasky#define wait_event_interruptible_locked(wqh, cond) ({ \ 187328653Shselasky int __ret; \ 188297459Snp \ 189328653Shselasky spin_unlock(&(wqh).lock); \ 190328653Shselasky __ret = __wait_event_common(wqh, cond, MAX_SCHEDULE_TIMEOUT, \ 191328653Shselasky TASK_INTERRUPTIBLE, NULL); \ 192328653Shselasky spin_lock(&(wqh).lock); \ 193297459Snp __ret; \ 194297459Snp}) 195297459Snp 196328653Shselasky/* 197328653Shselasky * Hold the (locked) spinlock when testing the cond. 198328653Shselasky */ 199328653Shselasky#define wait_event_interruptible_lock_irq(wqh, cond, lock) ({ \ 200328653Shselasky __wait_event_common(wqh, cond, MAX_SCHEDULE_TIMEOUT, \ 201328653Shselasky TASK_INTERRUPTIBLE, &(lock)); \ 202328653Shselasky}) 203297459Snp 204328653Shselaskystatic inline void 205328653Shselasky__add_wait_queue(wait_queue_head_t *wqh, wait_queue_t *wq) 206289564Shselasky{ 207328653Shselasky list_add(&wq->task_list, &wqh->task_list); 208289564Shselasky} 209219820Sjeff 210328653Shselaskystatic inline void 211328653Shselaskyadd_wait_queue(wait_queue_head_t *wqh, wait_queue_t *wq) 212328653Shselasky{ 213289564Shselasky 214328653Shselasky spin_lock(&wqh->lock); 215328653Shselasky __add_wait_queue(wqh, wq); 216328653Shselasky spin_unlock(&wqh->lock); 217328653Shselasky} 218328653Shselasky 219289564Shselaskystatic inline void 220328653Shselasky__add_wait_queue_tail(wait_queue_head_t *wqh, wait_queue_t *wq) 221289564Shselasky{ 222328653Shselasky list_add_tail(&wq->task_list, &wqh->task_list); 223289564Shselasky} 224289564Shselasky 225289564Shselaskystatic inline void 226328653Shselasky__remove_wait_queue(wait_queue_head_t *wqh, wait_queue_t *wq) 227289564Shselasky{ 228328653Shselasky list_del(&wq->task_list); 229289564Shselasky} 230289564Shselasky 231328653Shselaskystatic inline void 232328653Shselaskyremove_wait_queue(wait_queue_head_t *wqh, wait_queue_t *wq) 233328653Shselasky{ 234328653Shselasky 235328653Shselasky spin_lock(&wqh->lock); 236328653Shselasky __remove_wait_queue(wqh, wq); 237328653Shselasky spin_unlock(&wqh->lock); 238328653Shselasky} 239328653Shselasky 240328653Shselaskybool linux_waitqueue_active(wait_queue_head_t *); 241328653Shselasky 242328653Shselasky#define waitqueue_active(wqh) linux_waitqueue_active(wqh) 243328653Shselasky 244328653Shselaskyvoid linux_prepare_to_wait(wait_queue_head_t *, wait_queue_t *, int); 245328653Shselaskyvoid linux_finish_wait(wait_queue_head_t *, wait_queue_t *); 246328653Shselasky 247328653Shselasky#define prepare_to_wait(wqh, wq, state) linux_prepare_to_wait(wqh, wq, state) 248328653Shselasky#define finish_wait(wqh, wq) linux_finish_wait(wqh, wq) 249328653Shselasky 250328653Shselaskyvoid linux_wake_up_bit(void *, int); 251328653Shselaskyint linux_wait_on_bit_timeout(unsigned long *, int, unsigned int, int); 252328653Shselaskyvoid linux_wake_up_atomic_t(atomic_t *); 253328653Shselaskyint linux_wait_on_atomic_t(atomic_t *, unsigned int); 254328653Shselasky 255328653Shselasky#define wake_up_bit(word, bit) linux_wake_up_bit(word, bit) 256330847Shselasky#define wait_on_bit(word, bit, state) \ 257330847Shselasky linux_wait_on_bit_timeout(word, bit, state, MAX_SCHEDULE_TIMEOUT) 258328653Shselasky#define wait_on_bit_timeout(word, bit, state, timeout) \ 259328653Shselasky linux_wait_on_bit_timeout(word, bit, state, timeout) 260328653Shselasky#define wake_up_atomic_t(a) linux_wake_up_atomic_t(a) 261328653Shselasky/* 262328653Shselasky * All existing callers have a cb that just schedule()s. To avoid adding 263328653Shselasky * complexity, just emulate that internally. The prototype is different so that 264328653Shselasky * callers must be manually modified; a cb that does something other than call 265328653Shselasky * schedule() will require special treatment. 266328653Shselasky */ 267328653Shselasky#define wait_on_atomic_t(a, state) linux_wait_on_atomic_t(a, state) 268328653Shselasky 269328653Shselaskystruct task_struct; 270328653Shselaskybool linux_wake_up_state(struct task_struct *, unsigned int); 271328653Shselasky 272328653Shselasky#define wake_up_process(task) linux_wake_up_state(task, TASK_NORMAL) 273328653Shselasky#define wake_up_state(task, state) linux_wake_up_state(task, state) 274328653Shselasky 275328653Shselasky#endif /* _LINUX_WAIT_H_ */ 276