sys/ofed/include/linux/workqueue.h

   1 /*-
   2  * Copyright (c) 2010 Isilon Systems, Inc.
   3  * Copyright (c) 2010 iX Systems, Inc.
   4  * Copyright (c) 2010 Panasas, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice unmodified, this list of conditions, and the following
  12  *    disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28 #ifndef _LINUX_WORKQUEUE_H_
  29 #define _LINUX_WORKQUEUE_H_
  30
  31 #include <linux/types.h>
  32 #include <linux/kernel.h>
  33 #include <linux/timer.h>
  34 #include <linux/slab.h>
  35
  36 #include <sys/taskqueue.h>
  37
  38 struct workqueue_struct {
  39         struct taskqueue        *taskqueue;
  40 };
  41
  42 struct work_struct {
  43         struct  task            work_task;
  44         struct  taskqueue       *taskqueue;
  45         void                    (*fn)(struct work_struct *);
  46 };
  47
  48 struct delayed_work {
  49         struct work_struct      work;
  50         struct callout          timer;
  51 };
  52
  53 static inline struct delayed_work *
  54 to_delayed_work(struct work_struct *work)
  55 {
  56
  57         return container_of(work, struct delayed_work, work);
  58 }
  59
  60
  61 static inline void
  62 _work_fn(void *context, int pending)
  63 {
  64         struct work_struct *work;
  65
  66         work = context;
  67         work->fn(work);
  68 }
  69
  70 #define INIT_WORK(work, func)                                           \
  71 do {                                                                    \
  72         (work)->fn = (func);                                            \
  73         (work)->taskqueue = NULL;                                       \
  74         TASK_INIT(&(work)->work_task, 0, _work_fn, (work));             \
  75 } while (0)
  76
  77 #define INIT_DELAYED_WORK(_work, func)                                  \
  78 do {                                                                    \
  79         INIT_WORK(&(_work)->work, func);                                \
  80         callout_init(&(_work)->timer, CALLOUT_MPSAFE);                  \
  81 } while (0)
  82
  83 #define INIT_DELAYED_WORK_DEFERRABLE    INIT_DELAYED_WORK
  84
  85 #define schedule_work(work)                                             \
  86 do {                                                                    \
  87         (work)->taskqueue = taskqueue_thread;                           \
  88         taskqueue_enqueue(taskqueue_thread, &(work)->work_task);        \
  89 } while (0)
  90
  91 #define flush_scheduled_work()  flush_taskqueue(taskqueue_thread)
  92
  93 #define queue_work(q, work)                                             \
  94 do {                                                                    \
  95         (work)->taskqueue = (q)->taskqueue;                             \
  96         taskqueue_enqueue((q)->taskqueue, &(work)->work_task);          \
  97 } while (0)
  98
  99 static inline void
 100 _delayed_work_fn(void *arg)
 101 {
 102         struct delayed_work *work;
 103
 104         work = arg;
 105         taskqueue_enqueue(work->work.taskqueue, &work->work.work_task);
 106 }
 107
 108 static inline int
 109 queue_delayed_work(struct workqueue_struct *wq, struct delayed_work *work,
 110     unsigned long delay)
 111 {
 112         int pending;
 113
 114         pending = work->work.work_task.ta_pending;
 115         work->work.taskqueue = wq->taskqueue;
 116         if (delay != 0)
 117                 callout_reset(&work->timer, delay, _delayed_work_fn, work);
 118         else
 119                 _delayed_work_fn((void *)work);
 120
 121         return (!pending);
 122 }
 123
 124 static inline struct workqueue_struct *
 125 _create_workqueue_common(char *name, int cpus)
 126 {
 127         struct workqueue_struct *wq;
 128
 129         wq = kmalloc(sizeof(*wq), M_WAITOK);
 130         wq->taskqueue = taskqueue_create((name), M_WAITOK,
 131             taskqueue_thread_enqueue,  &wq->taskqueue);
 132         taskqueue_start_threads(&wq->taskqueue, cpus, PWAIT, "%s", name);
 133
 134         return (wq);
 135 }
 136
 137
 138 #define create_singlethread_workqueue(name)                             \
 139         _create_workqueue_common(name, 1)
 140
 141 #define create_workqueue(name)                                          \
 142         _create_workqueue_common(name, MAXCPU)
 143
 144 static inline void
 145 destroy_workqueue(struct workqueue_struct *wq)
 146 {
 147         taskqueue_free(wq->taskqueue);
 148         kfree(wq);
 149 }
 150
 151 #define flush_workqueue(wq)     flush_taskqueue((wq)->taskqueue)
 152
 153 static inline void
 154 _flush_fn(void *context, int pending)
 155 {
 156 }
 157
 158 static inline void
 159 flush_taskqueue(struct taskqueue *tq)
 160 {
 161         struct task flushtask;
 162
 163         PHOLD(curproc);
 164         TASK_INIT(&flushtask, 0, _flush_fn, NULL);
 165         taskqueue_enqueue(tq, &flushtask);
 166         taskqueue_drain(tq, &flushtask);
 167         PRELE(curproc);
 168 }
 169
 170 static inline int
 171 cancel_work_sync(struct work_struct *work)
 172 {
 173         if (work->taskqueue &&
 174             taskqueue_cancel(work->taskqueue, &work->work_task, NULL))
 175                 taskqueue_drain(work->taskqueue, &work->work_task);
 176         return 0;
 177 }
 178
 179 /*
 180  * This may leave work running on another CPU as it does on Linux.
 181  */
 182 static inline int
 183 cancel_delayed_work(struct delayed_work *work)
 184 {
 185
 186         callout_stop(&work->timer);
 187         if (work->work.taskqueue)
 188                 return (taskqueue_cancel(work->work.taskqueue,
 189                     &work->work.work_task, NULL) == 0);
 190         return 0;
 191 }
 192
 193 #endif  /* _LINUX_WORKQUEUE_H_ */