summaryrefslogtreecommitdiff
path: root/sys/external/bsd/drm2/include/linux/mutex.h
blob: d966f5f93dc6fad1a795fb4460069f31e922a6ad (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/*	$NetBSD: mutex.h,v 1.17 2021/12/19 11:33:31 riastradh Exp $	*/

/*-
 * Copyright (c) 2013 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Taylor R. Campbell.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _LINUX_MUTEX_H_
#define _LINUX_MUTEX_H_

#include <sys/mutex.h>

#include <lib/libkern/libkern.h> /* KASSERT */

#include <asm/processor.h>

#include <linux/list.h>
#include <linux/spinlock.h>

struct mutex {
	kmutex_t mtx_lock;
};

struct lock_class_key {
};

/* Name collision.  Pooh.  */
static inline void
linux_mutex_init(struct mutex *mutex)
{
	mutex_init(&mutex->mtx_lock, MUTEX_DEFAULT, IPL_NONE);
}

/* Lockdep stuff.  */
static inline void
__mutex_init(struct mutex *mutex, const char *name __unused,
    struct lock_class_key *key __unused)
{
	linux_mutex_init(mutex);
}

/* Another name collision.  */
static inline void
linux_mutex_destroy(struct mutex *mutex)
{
	mutex_destroy(&mutex->mtx_lock);
}

static inline void
mutex_lock(struct mutex *mutex)
{
	mutex_enter(&mutex->mtx_lock);
}

static inline int
mutex_lock_interruptible(struct mutex *mutex)
{
	mutex_enter(&mutex->mtx_lock); /* XXX */
	return 0;
}

static inline int
mutex_trylock(struct mutex *mutex)
{
	return mutex_tryenter(&mutex->mtx_lock);
}

static inline void
mutex_unlock(struct mutex *mutex)
{
	mutex_exit(&mutex->mtx_lock);
}

static inline bool
mutex_is_locked(struct mutex *mutex)
{
	return mutex_owned(&mutex->mtx_lock);
}

static inline void
mutex_lock_nest_lock(struct mutex *mutex, struct mutex *already)
{

	KASSERT(mutex_is_locked(already));
	mutex_lock(mutex);
}

static inline void
mutex_lock_nested(struct mutex *mutex, unsigned subclass __unused)
{
	mutex_lock(mutex);
}

static inline int
mutex_lock_interruptible_nested(struct mutex *mutex,
    unsigned subclass __unused)
{
	return mutex_lock_interruptible(mutex);
}

/*
 * `recursive locking is bad, do not use this ever.'
 * -- linux/scripts/checkpath.pl
 */
static inline enum {
	MUTEX_TRYLOCK_FAILED,
	MUTEX_TRYLOCK_SUCCESS,
	MUTEX_TRYLOCK_RECURSIVE,
}
mutex_trylock_recursive(struct mutex *mutex)
{
	if (mutex_owned(&mutex->mtx_lock))
		return MUTEX_TRYLOCK_RECURSIVE;
	else if (mutex_tryenter(&mutex->mtx_lock))
		return MUTEX_TRYLOCK_SUCCESS;
	else
		return MUTEX_TRYLOCK_FAILED;
}

#endif  /* _LINUX_MUTEX_H_ */