sys/ofed/include/linux/kthread.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  * 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_KTHREAD_H_
  30 #define _LINUX_KTHREAD_H_
  31
  32 #include <sys/param.h>
  33 #include <sys/lock.h>
  34 #include <sys/mutex.h>
  35 #include <sys/kernel.h>
  36 #include <sys/kthread.h>
  37 #include <sys/sleepqueue.h>
  38
  39 #include <linux/slab.h>
  40 #include <linux/sched.h>
  41
  42 static inline void
  43 _kthread_fn(void *arg)
  44 {
  45         struct task_struct *task;
  46
  47         task = arg;
  48         task_struct_set(curthread, task);
  49         if (task->should_stop == 0)
  50                 task->task_ret = task->task_fn(task->task_data);
  51         PROC_LOCK(task->task_thread->td_proc);
  52         task->should_stop = TASK_STOPPED;
  53         wakeup(task);
  54         PROC_UNLOCK(task->task_thread->td_proc);
  55         kthread_exit();
  56 }
  57
  58 static inline struct task_struct *
  59 _kthread_create(int (*threadfn)(void *data), void *data)
  60 {
  61         struct task_struct *task;
  62
  63         task = kzalloc(sizeof(*task), GFP_KERNEL);
  64         task->task_fn = threadfn;
  65         task->task_data = data;
  66
  67         return (task);
  68 }
  69
  70 struct task_struct *kthread_create(int (*threadfn)(void *data),
  71                                    void *data,
  72                                    const char namefmt[], ...)
  73         __attribute__((format(printf, 3, 4)));
  74
  75 #define kthread_run(fn, data, fmt, ...)                                 \
  76 ({                                                                      \
  77         struct task_struct *_task;                                      \
  78                                                                         \
  79         _task = _kthread_create((fn), (data));                          \
  80         if (kthread_add(_kthread_fn, _task, NULL, &_task->task_thread,  \
  81             0, 0, fmt, ## __VA_ARGS__)) {                               \
  82                 kfree(_task);                                           \
  83                 _task = NULL;                                           \
  84         } else                                                          \
  85                 task_struct_set(_task->task_thread, _task);             \
  86         _task;                                                          \
  87 })
  88
  89 #define kthread_should_stop()   current->should_stop
  90
  91 static inline int
  92 kthread_stop(struct task_struct *task)
  93 {
  94
  95         PROC_LOCK(task->task_thread->td_proc);
  96         task->should_stop = TASK_SHOULD_STOP;
  97         wake_up_process(task);
  98         while (task->should_stop != TASK_STOPPED)
  99                 msleep(task, &task->task_thread->td_proc->p_mtx, PWAIT,
 100                     "kstop", hz);
 101         PROC_UNLOCK(task->task_thread->td_proc);
 102         return task->task_ret;
 103 }
 104
 105 #endif  /* _LINUX_KTHREAD_H_ */