1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2014 François Tigeot 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 #ifndef _LINUX_WORKQUEUE_H_ 30 #define _LINUX_WORKQUEUE_H_ 31 32 #include <sys/types.h> 33 #include <sys/malloc.h> 34 #include <linux/types.h> 35 #include <linux/kernel.h> 36 #include <linux/timer.h> 37 38 #include <sys/taskqueue.h> 39 40 struct workqueue_struct { 41 struct taskqueue *taskqueue; 42 }; 43 44 struct work_struct { 45 struct task work_task; 46 struct taskqueue *taskqueue; 47 void (*fn)(struct work_struct *); 48 }; 49 50 struct delayed_work { 51 struct work_struct work; 52 struct callout timer; 53 struct lwkt_token token; 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_DELAYED_WORK(_work, func) \ 81 do { \ 82 INIT_WORK(&(_work)->work, func); \ 83 lwkt_token_init(&(_work)->token, "workqueue token"); \ 84 callout_init_mp(&(_work)->timer); \ 85 } while (0) 86 87 #define INIT_DEFERRABLE_WORK INIT_DELAYED_WORK 88 89 #define schedule_work(work) \ 90 do { \ 91 (work)->taskqueue = taskqueue_thread[mycpuid]; \ 92 taskqueue_enqueue(taskqueue_thread[mycpuid], &(work)->work_task); \ 93 } while (0) 94 95 #define flush_scheduled_work() flush_taskqueue(taskqueue_thread[mycpuid]) 96 97 #define queue_work(q, work) \ 98 do { \ 99 (work)->taskqueue = (q)->taskqueue; \ 100 taskqueue_enqueue((q)->taskqueue, &(work)->work_task); \ 101 } while (0) 102 103 static inline void 104 _delayed_work_fn(void *arg) 105 { 106 struct delayed_work *work; 107 108 work = arg; 109 taskqueue_enqueue(work->work.taskqueue, &work->work.work_task); 110 } 111 112 static inline int 113 queue_delayed_work(struct workqueue_struct *wq, struct delayed_work *work, 114 unsigned long delay) 115 { 116 int pending; 117 118 pending = work->work.work_task.ta_pending; 119 work->work.taskqueue = wq->taskqueue; 120 if (delay != 0) { 121 lwkt_gettoken(&work->token); 122 callout_reset(&work->timer, delay, _delayed_work_fn, work); 123 lwkt_reltoken(&work->token); 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 static inline struct workqueue_struct * 140 _create_workqueue_common(char *name, int cpus) 141 { 142 struct workqueue_struct *wq; 143 144 wq = kmalloc(sizeof(*wq), DRM_MEM_KMS, M_WAITOK); 145 wq->taskqueue = taskqueue_create((name), M_WAITOK, 146 taskqueue_thread_enqueue, &wq->taskqueue); 147 taskqueue_start_threads(&wq->taskqueue, cpus, 0, -1, "%s", name); 148 149 return (wq); 150 } 151 152 153 #define create_singlethread_workqueue(name) \ 154 _create_workqueue_common(name, 1) 155 156 #define create_workqueue(name) \ 157 _create_workqueue_common(name, MAXCPU) 158 159 #define alloc_ordered_workqueue(name, flags) \ 160 _create_workqueue_common(name, 1) 161 162 static inline void 163 destroy_workqueue(struct workqueue_struct *wq) 164 { 165 taskqueue_free(wq->taskqueue); 166 kfree(wq, DRM_MEM_KMS); 167 } 168 169 #define flush_workqueue(wq) flush_taskqueue((wq)->taskqueue) 170 171 static inline void 172 _flush_fn(void *context, int pending) 173 { 174 } 175 176 static inline void 177 flush_taskqueue(struct taskqueue *tq) 178 { 179 struct task flushtask; 180 181 PHOLD(curproc); 182 TASK_INIT(&flushtask, 0, _flush_fn, NULL); 183 taskqueue_enqueue(tq, &flushtask); 184 taskqueue_drain(tq, &flushtask); 185 PRELE(curproc); 186 } 187 188 static inline int 189 cancel_work_sync(struct work_struct *work) 190 { 191 if (work->taskqueue && 192 taskqueue_cancel(work->taskqueue, &work->work_task, NULL)) 193 taskqueue_drain(work->taskqueue, &work->work_task); 194 return 0; 195 } 196 197 /* 198 * This may leave work running on another CPU as it does on Linux. 199 */ 200 static inline int 201 cancel_delayed_work(struct delayed_work *work) 202 { 203 204 lwkt_gettoken(&work->token); 205 callout_stop(&work->timer); 206 lwkt_reltoken(&work->token); 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 lwkt_gettoken(&work->token); 218 callout_drain(&work->timer); 219 lwkt_reltoken(&work->token); 220 if (work->work.taskqueue && 221 taskqueue_cancel(work->work.taskqueue, &work->work.work_task, NULL)) 222 taskqueue_drain(work->work.taskqueue, &work->work.work_task); 223 return 0; 224 } 225 226 #endif /* _LINUX_WORKQUEUE_H_ */ 227