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) 2014-2015 François Tigeot 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 <sys/types.h> 34 #include <sys/malloc.h> 35 #include <sys/proc.h> 36 #include <linux/types.h> 37 #include <linux/kernel.h> 38 #include <linux/timer.h> 39 #include <linux/lockdep.h> 40 41 #include <sys/taskqueue.h> 42 43 struct workqueue_struct { 44 struct taskqueue *taskqueue; 45 }; 46 47 struct work_struct { 48 struct task work_task; 49 struct taskqueue *taskqueue; 50 void (*fn)(struct work_struct *); 51 }; 52 53 struct delayed_work { 54 struct work_struct work; 55 struct callout timer; 56 struct lwkt_token token; 57 }; 58 59 static inline struct delayed_work * 60 to_delayed_work(struct work_struct *work) 61 { 62 63 return container_of(work, struct delayed_work, work); 64 } 65 66 67 static inline void 68 _work_fn(void *context, int pending) 69 { 70 struct work_struct *work; 71 72 work = context; 73 work->fn(work); 74 } 75 76 #define INIT_WORK(work, func) \ 77 do { \ 78 (work)->fn = (func); \ 79 (work)->taskqueue = NULL; \ 80 TASK_INIT(&(work)->work_task, 0, _work_fn, (work)); \ 81 } while (0) 82 83 #define INIT_DELAYED_WORK(_work, func) \ 84 do { \ 85 INIT_WORK(&(_work)->work, func); \ 86 lwkt_token_init(&(_work)->token, "workqueue token"); \ 87 callout_init_mp(&(_work)->timer); \ 88 } while (0) 89 90 #define INIT_DEFERRABLE_WORK INIT_DELAYED_WORK 91 92 #define schedule_work(work) \ 93 do { \ 94 (work)->taskqueue = taskqueue_thread[mycpuid]; \ 95 taskqueue_enqueue(taskqueue_thread[mycpuid], &(work)->work_task); \ 96 } while (0) 97 98 #define flush_scheduled_work() flush_taskqueue(taskqueue_thread[mycpuid]) 99 100 static inline int queue_work(struct workqueue_struct *q, struct work_struct *work) 101 { 102 (work)->taskqueue = (q)->taskqueue; 103 /* Return opposite val to align with Linux logic */ 104 return !taskqueue_enqueue((q)->taskqueue, &(work)->work_task); 105 } 106 107 static inline void 108 _delayed_work_fn(void *arg) 109 { 110 struct delayed_work *work; 111 112 work = arg; 113 taskqueue_enqueue(work->work.taskqueue, &work->work.work_task); 114 } 115 116 static inline int 117 queue_delayed_work(struct workqueue_struct *wq, struct delayed_work *work, 118 unsigned long delay) 119 { 120 int pending; 121 122 pending = work->work.work_task.ta_pending; 123 work->work.taskqueue = wq->taskqueue; 124 if (delay != 0) { 125 lwkt_gettoken(&work->token); 126 callout_reset(&work->timer, delay, _delayed_work_fn, work); 127 lwkt_reltoken(&work->token); 128 } else { 129 _delayed_work_fn((void *)work); 130 } 131 132 return (!pending); 133 } 134 135 static inline bool schedule_delayed_work(struct delayed_work *dwork, 136 unsigned long delay) 137 { 138 struct workqueue_struct wq; 139 wq.taskqueue = taskqueue_thread[mycpuid]; 140 return queue_delayed_work(&wq, dwork, delay); 141 } 142 143 static inline struct workqueue_struct * 144 _create_workqueue_common(char *name, int cpus) 145 { 146 struct workqueue_struct *wq; 147 148 wq = kmalloc(sizeof(*wq), M_DRM, M_WAITOK); 149 wq->taskqueue = taskqueue_create((name), M_WAITOK, 150 taskqueue_thread_enqueue, &wq->taskqueue); 151 taskqueue_start_threads(&wq->taskqueue, cpus, 0, -1, "%s", name); 152 153 return (wq); 154 } 155 156 157 #define create_singlethread_workqueue(name) \ 158 _create_workqueue_common(name, 1) 159 160 #define create_workqueue(name) \ 161 _create_workqueue_common(name, MAXCPU) 162 163 #define alloc_ordered_workqueue(name, flags) \ 164 _create_workqueue_common(name, 1) 165 166 #define alloc_workqueue(name, flags, max_active) \ 167 _create_workqueue_common(name, max_active) 168 169 static inline void 170 destroy_workqueue(struct workqueue_struct *wq) 171 { 172 taskqueue_free(wq->taskqueue); 173 kfree(wq); 174 } 175 176 #define flush_workqueue(wq) flush_taskqueue((wq)->taskqueue) 177 178 static inline void 179 _flush_fn(void *context, int pending) 180 { 181 } 182 183 static inline void 184 flush_taskqueue(struct taskqueue *tq) 185 { 186 struct task flushtask; 187 188 PHOLD(curproc); 189 TASK_INIT(&flushtask, 0, _flush_fn, NULL); 190 taskqueue_enqueue(tq, &flushtask); 191 taskqueue_drain(tq, &flushtask); 192 PRELE(curproc); 193 } 194 195 static inline int 196 cancel_work_sync(struct work_struct *work) 197 { 198 if (work->taskqueue && 199 taskqueue_cancel(work->taskqueue, &work->work_task, NULL)) 200 taskqueue_drain(work->taskqueue, &work->work_task); 201 return 0; 202 } 203 204 /* 205 * This may leave work running on another CPU as it does on Linux. 206 */ 207 static inline int 208 cancel_delayed_work(struct delayed_work *work) 209 { 210 211 lwkt_gettoken(&work->token); 212 callout_stop(&work->timer); 213 lwkt_reltoken(&work->token); 214 if (work->work.taskqueue) 215 return (taskqueue_cancel(work->work.taskqueue, 216 &work->work.work_task, NULL) == 0); 217 return 0; 218 } 219 220 static inline int 221 cancel_delayed_work_sync(struct delayed_work *work) 222 { 223 224 lwkt_gettoken(&work->token); 225 callout_drain(&work->timer); 226 lwkt_reltoken(&work->token); 227 if (work->work.taskqueue && 228 taskqueue_cancel(work->work.taskqueue, &work->work.work_task, NULL)) 229 taskqueue_drain(work->work.taskqueue, &work->work.work_task); 230 return 0; 231 } 232 233 static inline bool 234 mod_delayed_work(struct workqueue_struct *wq, struct delayed_work *dwork, 235 unsigned long delay) 236 { 237 cancel_delayed_work(dwork); 238 queue_delayed_work(wq, dwork, delay); 239 return false; 240 } 241 242 /* System-wide workqueues */ 243 extern struct workqueue_struct *system_wq; 244 extern struct workqueue_struct *system_long_wq; 245 246 #endif /* _LINUX_WORKQUEUE_H_ */ 247