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) 2014-2018 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 (*fn)(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->fn(work); 71 } 72 73 #define INIT_WORK(work, func) \ 74 do { \ 75 (work)->fn = (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 PHOLD(curproc); 168 TASK_INIT(&flushtask, 0, _flush_fn, NULL); 169 taskqueue_enqueue(tq, &flushtask); 170 taskqueue_drain(tq, &flushtask); 171 PRELE(curproc); 172 } 173 174 static inline int 175 cancel_work_sync(struct work_struct *work) 176 { 177 if (work->taskqueue && 178 taskqueue_cancel(work->taskqueue, &work->work_task, NULL)) 179 taskqueue_drain(work->taskqueue, &work->work_task); 180 return 0; 181 } 182 183 /* 184 * This may leave work running on another CPU as it does on Linux. 185 */ 186 static inline int 187 cancel_delayed_work(struct delayed_work *work) 188 { 189 190 callout_stop(&work->timer); 191 if (work->work.taskqueue) 192 return (taskqueue_cancel(work->work.taskqueue, 193 &work->work.work_task, NULL) == 0); 194 return 0; 195 } 196 197 static inline int 198 cancel_delayed_work_sync(struct delayed_work *work) 199 { 200 201 callout_drain(&work->timer); 202 if (work->work.taskqueue && 203 taskqueue_cancel(work->work.taskqueue, &work->work.work_task, NULL)) 204 taskqueue_drain(work->work.taskqueue, &work->work.work_task); 205 return 0; 206 } 207 208 static inline bool 209 mod_delayed_work(struct workqueue_struct *wq, struct delayed_work *dwork, 210 unsigned long delay) 211 { 212 cancel_delayed_work(dwork); 213 queue_delayed_work(wq, dwork, delay); 214 return false; 215 } 216 217 static inline bool 218 flush_work(struct work_struct *work) 219 { 220 if (work->taskqueue != NULL) 221 taskqueue_drain(work->taskqueue, &work->work_task); 222 return true; 223 } 224 225 static inline void 226 destroy_work_on_stack(struct work_struct *work) 227 { 228 } 229 230 /* System-wide workqueues */ 231 extern struct workqueue_struct *system_wq; 232 extern struct workqueue_struct *system_long_wq; 233 extern struct workqueue_struct *system_power_efficient_wq; 234 extern struct workqueue_struct *system_unbound_wq; 235 236 static inline unsigned int 237 work_busy(struct work_struct *work) 238 { 239 /* Just pretend nothing is busy, this function is unreliable anyway */ 240 return 0; 241 } 242 243 #endif /* _LINUX_WORKQUEUE_H_ */ 244