1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2015 Mellanox Technologies, Ltd. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 #ifndef _LINUX_WORKQUEUE_H_ 32 #define _LINUX_WORKQUEUE_H_ 33 34 #include <linux/types.h> 35 #include <linux/kernel.h> 36 #include <linux/timer.h> 37 #include <linux/slab.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 typedef __typeof(((struct work_struct *)0)->fn) work_func_t; 52 53 struct delayed_work { 54 struct work_struct work; 55 struct callout timer; 56 }; 57 58 static inline struct delayed_work * 59 to_delayed_work(struct work_struct *work) 60 { 61 62 return container_of(work, struct delayed_work, work); 63 } 64 65 66 static inline void 67 _work_fn(void *context, int pending) 68 { 69 struct work_struct *work; 70 71 work = context; 72 work->fn(work); 73 } 74 75 #define INIT_WORK(work, func) \ 76 do { \ 77 (work)->fn = (func); \ 78 (work)->taskqueue = NULL; \ 79 TASK_INIT(&(work)->work_task, 0, _work_fn, (work)); \ 80 } while (0) 81 82 #define INIT_DELAYED_WORK(_work, func) \ 83 do { \ 84 INIT_WORK(&(_work)->work, func); \ 85 callout_init(&(_work)->timer, 1); \ 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; \ 93 taskqueue_enqueue(taskqueue_thread, &(work)->work_task); \ 94 } while (0) 95 96 #define flush_scheduled_work() flush_taskqueue(taskqueue_thread) 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 return (!pending); 128 } 129 130 static inline bool schedule_delayed_work(struct delayed_work *dwork, 131 unsigned long delay) 132 { 133 struct workqueue_struct wq; 134 wq.taskqueue = taskqueue_thread; 135 return queue_delayed_work(&wq, dwork, delay); 136 } 137 138 static inline struct workqueue_struct * 139 _create_workqueue_common(char *name, int cpus) 140 { 141 struct workqueue_struct *wq; 142 143 wq = kmalloc(sizeof(*wq), M_WAITOK); 144 wq->taskqueue = taskqueue_create((name), M_WAITOK, 145 taskqueue_thread_enqueue, &wq->taskqueue); 146 taskqueue_start_threads(&wq->taskqueue, cpus, PWAIT, "%s", name); 147 148 return (wq); 149 } 150 151 152 #define create_singlethread_workqueue(name) \ 153 _create_workqueue_common(name, 1) 154 155 #define create_workqueue(name) \ 156 _create_workqueue_common(name, MAXCPU) 157 158 #define alloc_ordered_workqueue(name, flags) \ 159 _create_workqueue_common(name, 1) 160 161 #define alloc_workqueue(name, flags, max_active) \ 162 _create_workqueue_common(name, max_active) 163 164 static inline void 165 destroy_workqueue(struct workqueue_struct *wq) 166 { 167 taskqueue_free(wq->taskqueue); 168 kfree(wq); 169 } 170 171 #define flush_workqueue(wq) flush_taskqueue((wq)->taskqueue) 172 173 static inline void 174 _flush_fn(void *context, int pending) 175 { 176 } 177 178 static inline void 179 flush_taskqueue(struct taskqueue *tq) 180 { 181 struct task flushtask; 182 183 PHOLD(curproc); 184 TASK_INIT(&flushtask, 0, _flush_fn, NULL); 185 taskqueue_enqueue(tq, &flushtask); 186 taskqueue_drain(tq, &flushtask); 187 PRELE(curproc); 188 } 189 190 static inline int 191 cancel_work_sync(struct work_struct *work) 192 { 193 if (work->taskqueue && 194 taskqueue_cancel(work->taskqueue, &work->work_task, NULL)) 195 taskqueue_drain(work->taskqueue, &work->work_task); 196 return 0; 197 } 198 199 /* 200 * This may leave work running on another CPU as it does on Linux. 201 */ 202 static inline int 203 cancel_delayed_work(struct delayed_work *work) 204 { 205 206 callout_stop(&work->timer); 207 if (work->work.taskqueue) 208 return (taskqueue_cancel(work->work.taskqueue, 209 &work->work.work_task, NULL) == 0); 210 return 0; 211 } 212 213 static inline int 214 cancel_delayed_work_sync(struct delayed_work *work) 215 { 216 217 callout_drain(&work->timer); 218 if (work->work.taskqueue && 219 taskqueue_cancel(work->work.taskqueue, &work->work.work_task, NULL)) 220 taskqueue_drain(work->work.taskqueue, &work->work.work_task); 221 return 0; 222 } 223 224 static inline bool 225 mod_delayed_work(struct workqueue_struct *wq, struct delayed_work *dwork, 226 unsigned long delay) 227 { 228 cancel_delayed_work(dwork); 229 queue_delayed_work(wq, dwork, delay); 230 return false; 231 } 232 233 #endif /* _LINUX_WORKQUEUE_H_ */ 234