1 /* 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. 6 * Copyright (c) 2014-2019 François Tigeot <ftigeot@wolfpond.org> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice unmodified, this list of conditions, and the following 14 * disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 #ifndef _LINUX_WORKQUEUE_H_ 31 #define _LINUX_WORKQUEUE_H_ 32 33 #include <linux/timer.h> 34 #include <linux/bitops.h> 35 #include <linux/lockdep.h> 36 #include <linux/atomic.h> 37 #include <linux/cpumask.h> 38 39 #include <sys/taskqueue.h> 40 41 struct workqueue_struct { 42 struct taskqueue *taskqueue; 43 }; 44 45 struct work_struct { 46 struct task work_task; 47 struct taskqueue *taskqueue; 48 void (*func)(struct work_struct *); 49 }; 50 51 struct delayed_work { 52 struct work_struct work; 53 struct callout timer; 54 }; 55 56 static inline struct delayed_work * 57 to_delayed_work(struct work_struct *work) 58 { 59 60 return container_of(work, struct delayed_work, work); 61 } 62 63 64 static inline void 65 _work_fn(void *context, int pending) 66 { 67 struct work_struct *work; 68 69 work = context; 70 work->func(work); 71 } 72 73 #define INIT_WORK(work, _func) \ 74 do { \ 75 (work)->func = (_func); \ 76 (work)->taskqueue = NULL; \ 77 TASK_INIT(&(work)->work_task, 0, _work_fn, (work)); \ 78 } while (0) 79 80 #define INIT_WORK_ONSTACK(work, _func) INIT_WORK(work, _func) 81 82 #define INIT_DELAYED_WORK(_work, _func) \ 83 do { \ 84 INIT_WORK(&(_work)->work, _func); \ 85 callout_init_mp(&(_work)->timer); \ 86 } while (0) 87 88 #define INIT_DEFERRABLE_WORK INIT_DELAYED_WORK 89 90 #define schedule_work(work) \ 91 do { \ 92 (work)->taskqueue = taskqueue_thread[mycpuid]; \ 93 taskqueue_enqueue(taskqueue_thread[mycpuid], &(work)->work_task); \ 94 } while (0) 95 96 #define flush_scheduled_work() flush_taskqueue(taskqueue_thread[mycpuid]) 97 98 static inline int queue_work(struct workqueue_struct *q, struct work_struct *work) 99 { 100 (work)->taskqueue = (q)->taskqueue; 101 /* Return opposite val to align with Linux logic */ 102 return !taskqueue_enqueue((q)->taskqueue, &(work)->work_task); 103 } 104 105 static inline void 106 _delayed_work_fn(void *arg) 107 { 108 struct delayed_work *work; 109 110 work = arg; 111 taskqueue_enqueue(work->work.taskqueue, &work->work.work_task); 112 } 113 114 static inline int 115 queue_delayed_work(struct workqueue_struct *wq, struct delayed_work *work, 116 unsigned long delay) 117 { 118 int pending; 119 120 pending = work->work.work_task.ta_pending; 121 work->work.taskqueue = wq->taskqueue; 122 if (delay != 0) { 123 callout_reset(&work->timer, delay, _delayed_work_fn, work); 124 } else { 125 _delayed_work_fn((void *)work); 126 } 127 128 return (!pending); 129 } 130 131 static inline bool schedule_delayed_work(struct delayed_work *dwork, 132 unsigned long delay) 133 { 134 struct workqueue_struct wq; 135 wq.taskqueue = taskqueue_thread[mycpuid]; 136 return queue_delayed_work(&wq, dwork, delay); 137 } 138 139 struct workqueue_struct * _create_workqueue_common(char *name, int cpus); 140 141 #define create_singlethread_workqueue(name) \ 142 _create_workqueue_common(name, 1) 143 144 #define create_workqueue(name) \ 145 _create_workqueue_common(name, MAXCPU) 146 147 #define alloc_ordered_workqueue(name, flags) \ 148 _create_workqueue_common(name, 1) 149 150 #define alloc_workqueue(name, flags, max_active) \ 151 _create_workqueue_common(name, max_active) 152 153 void destroy_workqueue(struct workqueue_struct *wq); 154 155 #define flush_workqueue(wq) flush_taskqueue((wq)->taskqueue) 156 157 static inline void 158 _flush_fn(void *context, int pending) 159 { 160 } 161 162 static inline void 163 flush_taskqueue(struct taskqueue *tq) 164 { 165 struct task flushtask; 166 167 TASK_INIT(&flushtask, 0, _flush_fn, NULL); 168 taskqueue_enqueue(tq, &flushtask); 169 taskqueue_drain(tq, &flushtask); 170 } 171 172 static inline int 173 cancel_work_sync(struct work_struct *work) 174 { 175 if (work->taskqueue && 176 taskqueue_cancel(work->taskqueue, &work->work_task, NULL)) 177 taskqueue_drain(work->taskqueue, &work->work_task); 178 return 0; 179 } 180 181 /* 182 * This may leave work running on another CPU as it does on Linux. 183 */ 184 static inline int 185 cancel_delayed_work(struct delayed_work *work) 186 { 187 188 callout_stop(&work->timer); 189 if (work->work.taskqueue) 190 return (taskqueue_cancel(work->work.taskqueue, 191 &work->work.work_task, NULL) == 0); 192 return 0; 193 } 194 195 static inline int 196 cancel_delayed_work_sync(struct delayed_work *work) 197 { 198 callout_cancel(&work->timer); 199 if (work->work.taskqueue && 200 taskqueue_cancel(work->work.taskqueue, &work->work.work_task, NULL)) 201 taskqueue_drain(work->work.taskqueue, &work->work.work_task); 202 return 0; 203 } 204 205 static inline bool 206 mod_delayed_work(struct workqueue_struct *wq, struct delayed_work *dwork, 207 unsigned long delay) 208 { 209 cancel_delayed_work(dwork); 210 queue_delayed_work(wq, dwork, delay); 211 return false; 212 } 213 214 static inline bool 215 flush_work(struct work_struct *work) 216 { 217 if (work->taskqueue != NULL) 218 taskqueue_drain(work->taskqueue, &work->work_task); 219 return true; 220 } 221 222 static inline void 223 destroy_work_on_stack(struct work_struct *work) 224 { 225 } 226 227 /* System-wide workqueues */ 228 extern struct workqueue_struct *system_wq; 229 extern struct workqueue_struct *system_long_wq; 230 extern struct workqueue_struct *system_power_efficient_wq; 231 extern struct workqueue_struct *system_unbound_wq; 232 233 static inline unsigned int 234 work_busy(struct work_struct *work) 235 { 236 /* Just pretend nothing is busy, this function is unreliable anyway */ 237 return 0; 238 } 239 240 bool flush_delayed_work(struct delayed_work *dwork); 241 242 #endif /* _LINUX_WORKQUEUE_H_ */ 243