2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2017 Mellanox Technologies, Ltd.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
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.
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.
31 #ifndef _LINUX_SPINLOCK_H_
32 #define _LINUX_SPINLOCK_H_
34 #include <sys/param.h>
35 #include <sys/kernel.h>
37 #include <sys/mutex.h>
40 #include <linux/compiler.h>
41 #include <linux/rwlock.h>
42 #include <linux/bottom_half.h>
49 * By defining CONFIG_SPIN_SKIP LinuxKPI spinlocks and asserts will be
50 * skipped during panic(). By default it is disabled due to
51 * performance reasons.
53 #ifdef CONFIG_SPIN_SKIP
54 #define SPIN_SKIP(void) unlikely(SCHEDULER_STOPPED() || kdb_active)
56 #define SPIN_SKIP(void) 0
59 #define spin_lock(_l) do { \
66 #define spin_lock_bh(_l) do { \
70 #define spin_lock_irq(_l) do { \
74 #define spin_unlock(_l) do { \
78 mtx_unlock(&(_l)->m); \
81 #define spin_unlock_bh(_l) do { \
85 #define spin_unlock_irq(_l) do { \
89 #define spin_trylock(_l) ({ \
94 __ret = mtx_trylock(&(_l)->m); \
95 if (likely(__ret != 0)) \
101 #define spin_trylock_irq(_l) \
104 #define spin_lock_nested(_l, _n) do { \
107 mtx_lock_flags(&(_l)->m, MTX_DUPOK); \
108 local_bh_disable(); \
111 #define spin_lock_irqsave(_l, flags) do { \
116 #define spin_lock_irqsave_nested(_l, flags, _n) do { \
118 spin_lock_nested(_l, _n); \
121 #define spin_unlock_irqrestore(_l, flags) do { \
126 /* NOTE: the maximum WITNESS name is 64 chars */
127 #define __spin_lock_name(name, file, line) \
128 (((const char *){file ":" #line "-" name}) + \
129 (sizeof(file) > 16 ? sizeof(file) - 16 : 0))
131 #define __spin_lock_name(name, file, line) name
133 #define _spin_lock_name(...) __spin_lock_name(__VA_ARGS__)
134 #define spin_lock_name(name) _spin_lock_name(name, __FILE__, __LINE__)
136 #define spin_lock_init(lock) linux_spin_lock_init(lock, spin_lock_name("lnxspin"))
139 linux_spin_lock_init(spinlock_t *lock, const char *name)
142 memset(lock, 0, sizeof(*lock));
143 mtx_init(&lock->m, name, NULL, MTX_DEF | MTX_NOWITNESS);
147 spin_lock_destroy(spinlock_t *lock)
150 mtx_destroy(&lock->m);
153 #define DEFINE_SPINLOCK(lock) \
155 MTX_SYSINIT(lock, &(lock).m, spin_lock_name("lnxspin"), MTX_DEF)
157 #define assert_spin_locked(_l) do { \
160 mtx_assert(&(_l)->m, MA_OWNED); \
163 #endif /* _LINUX_SPINLOCK_H_ */