e560eab72c
1) Add better spinlock debug names when WITNESS_ALL is defined. 2) Make sure that the calling thread gets bound to the current CPU while a spinlock is locked. Some Linux kernel code depends on that the CPU ID doesn't change while a spinlock is locked. 3) Add support for using LinuxKPI spinlocks during a panic(). MFC after: 1 week Sponsored by: Mellanox Technologies
161 lines
4.2 KiB
C
161 lines
4.2 KiB
C
/*-
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* Copyright (c) 2010 Isilon Systems, Inc.
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* Copyright (c) 2010 iX Systems, Inc.
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* Copyright (c) 2010 Panasas, Inc.
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* Copyright (c) 2013-2017 Mellanox Technologies, Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _LINUX_SPINLOCK_H_
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#define _LINUX_SPINLOCK_H_
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/kdb.h>
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#include <linux/compiler.h>
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#include <linux/rwlock.h>
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#include <linux/bottom_half.h>
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typedef struct {
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struct mtx m;
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} spinlock_t;
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/*
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* By defining CONFIG_SPIN_SKIP LinuxKPI spinlocks and asserts will be
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* skipped during panic(). By default it is disabled due to
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* performance reasons.
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*/
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#ifdef CONFIG_SPIN_SKIP
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#define SPIN_SKIP(void) unlikely(SCHEDULER_STOPPED() || kdb_active)
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#else
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#define SPIN_SKIP(void) 0
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#endif
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#define spin_lock(_l) do { \
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if (SPIN_SKIP()) \
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break; \
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mtx_lock(&(_l)->m); \
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local_bh_disable(); \
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} while (0)
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#define spin_lock_bh(_l) do { \
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spin_lock(_l); \
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} while (0)
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#define spin_lock_irq(_l) do { \
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spin_lock(_l); \
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} while (0)
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#define spin_unlock(_l) do { \
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if (SPIN_SKIP()) \
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break; \
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local_bh_enable(); \
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mtx_unlock(&(_l)->m); \
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} while (0)
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#define spin_unlock_bh(_l) do { \
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spin_unlock(_l); \
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} while (0)
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#define spin_unlock_irq(_l) do { \
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spin_unlock(_l); \
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} while (0)
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#define spin_trylock(_l) ({ \
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int __ret; \
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if (SPIN_SKIP()) { \
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__ret = 1; \
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} else { \
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__ret = mtx_trylock(&(_l)->m); \
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if (likely(__ret != 0)) \
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local_bh_disable(); \
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} \
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__ret; \
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})
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#define spin_lock_nested(_l, _n) do { \
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if (SPIN_SKIP()) \
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break; \
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mtx_lock_flags(&(_l)->m, MTX_DUPOK); \
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local_bh_disable(); \
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} while (0)
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#define spin_lock_irqsave(_l, flags) do { \
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(flags) = 0; \
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spin_lock(_l); \
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} while (0)
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#define spin_lock_irqsave_nested(_l, flags, _n) do { \
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(flags) = 0; \
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spin_lock_nested(_l, _n); \
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} while (0)
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#define spin_unlock_irqrestore(_l, flags) do { \
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spin_unlock(_l); \
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} while (0)
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#ifdef WITNESS_ALL
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/* NOTE: the maximum WITNESS name is 64 chars */
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#define __spin_lock_name(name, file, line) \
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(((const char *){file ":" #line "-" name}) + \
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(sizeof(file) > 16 ? sizeof(file) - 16 : 0))
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#else
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#define __spin_lock_name(name, file, line) name
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#endif
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#define _spin_lock_name(...) __spin_lock_name(__VA_ARGS__)
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#define spin_lock_name(name) _spin_lock_name(name, __FILE__, __LINE__)
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#define spin_lock_init(lock) linux_spin_lock_init(lock, spin_lock_name("lnxspin"))
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static inline void
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linux_spin_lock_init(spinlock_t *lock, const char *name)
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{
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memset(lock, 0, sizeof(*lock));
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mtx_init(&lock->m, name, NULL, MTX_DEF | MTX_NOWITNESS);
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}
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static inline void
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spin_lock_destroy(spinlock_t *lock)
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{
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mtx_destroy(&lock->m);
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}
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#define DEFINE_SPINLOCK(lock) \
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spinlock_t lock; \
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MTX_SYSINIT(lock, &(lock).m, spin_lock_name("lnxspin"), MTX_DEF)
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#define assert_spin_locked(_l) do { \
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if (SPIN_SKIP()) \
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break; \
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mtx_assert(&(_l)->m, MA_OWNED); \
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} while (0)
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#endif /* _LINUX_SPINLOCK_H_ */
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