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
145
146
147
148
149
|
/*-
* Copyright (c) 2017 Mellanox Technologies, Ltd.
* All rights reserved.
*
* 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 unmodified, 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 AUTHOR ``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 AUTHOR 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 _LINUXKPI_LINUX_WW_MUTEX_H_
#define _LINUXKPI_LINUX_WW_MUTEX_H_
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/condvar.h>
#include <sys/kernel.h>
#include <linux/mutex.h>
struct ww_class {
const char *mutex_name;
};
struct ww_acquire_ctx {
};
struct ww_mutex {
struct mutex base;
struct cv condvar;
struct ww_acquire_ctx *ctx;
};
#define DEFINE_WW_CLASS(name) \
struct ww_class name = { \
.mutex_name = mutex_name(#name "_mutex") \
}
#define DEFINE_WW_MUTEX(name, ww_class) \
struct ww_mutex name; \
static void name##_init(void *arg) \
{ \
ww_mutex_init(&name, &ww_class); \
} \
SYSINIT(name, SI_SUB_LOCK, SI_ORDER_SECOND, name##_init, NULL)
#define DEFINE_WD_CLASS(name) DEFINE_WW_CLASS(name)
#define ww_mutex_is_locked(_m) \
sx_xlocked(&(_m)->base.sx)
#define ww_mutex_lock_slow(_m, _x) \
ww_mutex_lock(_m, _x)
#define ww_mutex_lock_slow_interruptible(_m, _x) \
ww_mutex_lock_interruptible(_m, _x)
#if defined(LINUXKPI_VERSION) && LINUXKPI_VERSION >= 51600
static inline int __must_check
ww_mutex_trylock(struct ww_mutex *lock, struct ww_acquire_ctx *ctx __unused)
#else
static inline int __must_check
ww_mutex_trylock(struct ww_mutex *lock)
#endif
{
return (mutex_trylock(&lock->base));
}
extern int linux_ww_mutex_lock_sub(struct ww_mutex *,
struct ww_acquire_ctx *, int catch_signal);
static inline int
ww_mutex_lock(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
{
if (MUTEX_SKIP())
return (0);
else if ((struct thread *)SX_OWNER(lock->base.sx.sx_lock) == curthread)
return (-EALREADY);
else
return (linux_ww_mutex_lock_sub(lock, ctx, 0));
}
static inline int
ww_mutex_lock_interruptible(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
{
if (MUTEX_SKIP())
return (0);
else if ((struct thread *)SX_OWNER(lock->base.sx.sx_lock) == curthread)
return (-EALREADY);
else
return (linux_ww_mutex_lock_sub(lock, ctx, 1));
}
extern void linux_ww_mutex_unlock_sub(struct ww_mutex *);
static inline void
ww_mutex_unlock(struct ww_mutex *lock)
{
if (MUTEX_SKIP())
return;
else
linux_ww_mutex_unlock_sub(lock);
}
static inline void
ww_mutex_destroy(struct ww_mutex *lock)
{
cv_destroy(&lock->condvar);
mutex_destroy(&lock->base);
}
static inline void
ww_acquire_init(struct ww_acquire_ctx *ctx, struct ww_class *ww_class)
{
}
static inline void
ww_mutex_init(struct ww_mutex *lock, struct ww_class *ww_class)
{
linux_mutex_init(&lock->base, ww_class->mutex_name, SX_NOWITNESS);
cv_init(&lock->condvar, "lkpi-ww");
}
static inline void
ww_acquire_fini(struct ww_acquire_ctx *ctx)
{
}
static inline void
ww_acquire_done(struct ww_acquire_ctx *ctx)
{
}
#endif /* _LINUXKPI_LINUX_WW_MUTEX_H_ */
|
