sys/dev/drm/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  * 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_ */