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