1219820Sjeff/*- 2219820Sjeff * Copyright (c) 2010 Isilon Systems, Inc. 3219820Sjeff * Copyright (c) 2010 iX Systems, Inc. 4219820Sjeff * Copyright (c) 2010 Panasas, Inc. 5328653Shselasky * Copyright (c) 2013-2017 Mellanox Technologies, Ltd. 6219820Sjeff * All rights reserved. 7219820Sjeff * 8219820Sjeff * Redistribution and use in source and binary forms, with or without 9219820Sjeff * modification, are permitted provided that the following conditions 10219820Sjeff * are met: 11219820Sjeff * 1. Redistributions of source code must retain the above copyright 12219820Sjeff * notice unmodified, this list of conditions, and the following 13219820Sjeff * disclaimer. 14219820Sjeff * 2. Redistributions in binary form must reproduce the above copyright 15219820Sjeff * notice, this list of conditions and the following disclaimer in the 16219820Sjeff * documentation and/or other materials provided with the distribution. 17219820Sjeff * 18219820Sjeff * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19219820Sjeff * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20219820Sjeff * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21219820Sjeff * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22219820Sjeff * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23219820Sjeff * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24219820Sjeff * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25219820Sjeff * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26219820Sjeff * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27219820Sjeff * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28289644Shselasky * 29289644Shselasky * $FreeBSD: stable/11/sys/compat/linuxkpi/common/include/linux/spinlock.h 331756 2018-03-30 02:04:46Z emaste $ 30219820Sjeff */ 31219820Sjeff#ifndef _LINUX_SPINLOCK_H_ 32219820Sjeff#define _LINUX_SPINLOCK_H_ 33219820Sjeff 34219820Sjeff#include <sys/param.h> 35219820Sjeff#include <sys/kernel.h> 36219820Sjeff#include <sys/lock.h> 37219820Sjeff#include <sys/mutex.h> 38328653Shselasky#include <sys/kdb.h> 39219820Sjeff 40219820Sjeff#include <linux/compiler.h> 41219820Sjeff#include <linux/rwlock.h> 42328653Shselasky#include <linux/bottom_half.h> 43219820Sjeff 44219820Sjefftypedef struct { 45219820Sjeff struct mtx m; 46219820Sjeff} spinlock_t; 47219820Sjeff 48328653Shselasky/* 49328653Shselasky * By defining CONFIG_SPIN_SKIP LinuxKPI spinlocks and asserts will be 50328653Shselasky * skipped during panic(). By default it is disabled due to 51328653Shselasky * performance reasons. 52328653Shselasky */ 53328653Shselasky#ifdef CONFIG_SPIN_SKIP 54328653Shselasky#define SPIN_SKIP(void) unlikely(SCHEDULER_STOPPED() || kdb_active) 55328653Shselasky#else 56328653Shselasky#define SPIN_SKIP(void) 0 57328653Shselasky#endif 58219820Sjeff 59328653Shselasky#define spin_lock(_l) do { \ 60328653Shselasky if (SPIN_SKIP()) \ 61328653Shselasky break; \ 62328653Shselasky mtx_lock(&(_l)->m); \ 63328653Shselasky local_bh_disable(); \ 64328653Shselasky} while (0) 65328653Shselasky 66328653Shselasky#define spin_lock_bh(_l) do { \ 67328653Shselasky spin_lock(_l); \ 68328653Shselasky} while (0) 69328653Shselasky 70328653Shselasky#define spin_lock_irq(_l) do { \ 71328653Shselasky spin_lock(_l); \ 72328653Shselasky} while (0) 73328653Shselasky 74328653Shselasky#define spin_unlock(_l) do { \ 75328653Shselasky if (SPIN_SKIP()) \ 76328653Shselasky break; \ 77328653Shselasky local_bh_enable(); \ 78328653Shselasky mtx_unlock(&(_l)->m); \ 79328653Shselasky} while (0) 80328653Shselasky 81328653Shselasky#define spin_unlock_bh(_l) do { \ 82328653Shselasky spin_unlock(_l); \ 83328653Shselasky} while (0) 84328653Shselasky 85328653Shselasky#define spin_unlock_irq(_l) do { \ 86328653Shselasky spin_unlock(_l); \ 87328653Shselasky} while (0) 88328653Shselasky 89328653Shselasky#define spin_trylock(_l) ({ \ 90328653Shselasky int __ret; \ 91328653Shselasky if (SPIN_SKIP()) { \ 92328653Shselasky __ret = 1; \ 93328653Shselasky } else { \ 94328653Shselasky __ret = mtx_trylock(&(_l)->m); \ 95328653Shselasky if (likely(__ret != 0)) \ 96328653Shselasky local_bh_disable(); \ 97328653Shselasky } \ 98328653Shselasky __ret; \ 99328653Shselasky}) 100328653Shselasky 101329965Shselasky#define spin_trylock_irq(_l) \ 102329965Shselasky spin_trylock(_l) 103329965Shselasky 104328653Shselasky#define spin_lock_nested(_l, _n) do { \ 105328653Shselasky if (SPIN_SKIP()) \ 106328653Shselasky break; \ 107328653Shselasky mtx_lock_flags(&(_l)->m, MTX_DUPOK); \ 108328653Shselasky local_bh_disable(); \ 109328653Shselasky} while (0) 110328653Shselasky 111328653Shselasky#define spin_lock_irqsave(_l, flags) do { \ 112328653Shselasky (flags) = 0; \ 113328653Shselasky spin_lock(_l); \ 114328653Shselasky} while (0) 115328653Shselasky 116328653Shselasky#define spin_lock_irqsave_nested(_l, flags, _n) do { \ 117328653Shselasky (flags) = 0; \ 118328653Shselasky spin_lock_nested(_l, _n); \ 119328653Shselasky} while (0) 120328653Shselasky 121328653Shselasky#define spin_unlock_irqrestore(_l, flags) do { \ 122328653Shselasky spin_unlock(_l); \ 123328653Shselasky} while (0) 124328653Shselasky 125328653Shselasky#ifdef WITNESS_ALL 126328653Shselasky/* NOTE: the maximum WITNESS name is 64 chars */ 127328653Shselasky#define __spin_lock_name(name, file, line) \ 128331756Semaste (((const char *){file ":" #line "-" name}) + \ 129328653Shselasky (sizeof(file) > 16 ? sizeof(file) - 16 : 0)) 130328653Shselasky#else 131328653Shselasky#define __spin_lock_name(name, file, line) name 132328653Shselasky#endif 133328653Shselasky#define _spin_lock_name(...) __spin_lock_name(__VA_ARGS__) 134328653Shselasky#define spin_lock_name(name) _spin_lock_name(name, __FILE__, __LINE__) 135328653Shselasky 136328653Shselasky#define spin_lock_init(lock) linux_spin_lock_init(lock, spin_lock_name("lnxspin")) 137328653Shselasky 138219820Sjeffstatic inline void 139328653Shselaskylinux_spin_lock_init(spinlock_t *lock, const char *name) 140219820Sjeff{ 141219820Sjeff 142328653Shselasky memset(lock, 0, sizeof(*lock)); 143328653Shselasky mtx_init(&lock->m, name, NULL, MTX_DEF | MTX_NOWITNESS); 144219820Sjeff} 145219820Sjeff 146328653Shselaskystatic inline void 147328653Shselaskyspin_lock_destroy(spinlock_t *lock) 148328653Shselasky{ 149219820Sjeff 150328653Shselasky mtx_destroy(&lock->m); 151328653Shselasky} 152328653Shselasky 153328653Shselasky#define DEFINE_SPINLOCK(lock) \ 154328653Shselasky spinlock_t lock; \ 155328653Shselasky MTX_SYSINIT(lock, &(lock).m, spin_lock_name("lnxspin"), MTX_DEF) 156328653Shselasky 157328653Shselasky#define assert_spin_locked(_l) do { \ 158328653Shselasky if (SPIN_SKIP()) \ 159328653Shselasky break; \ 160328653Shselasky mtx_assert(&(_l)->m, MA_OWNED); \ 161328653Shselasky} while (0) 162328653Shselasky 163328653Shselasky#endif /* _LINUX_SPINLOCK_H_ */ 164