395be823fd
This patch is part of https://reviews.freebsd.org/D19565. Reviewed by: hps Approved by: imp (mentor), hps
144 lines
3.7 KiB
C
144 lines
3.7 KiB
C
/*-
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* Copyright (c) 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_WW_MUTEX_H_
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#define _LINUX_WW_MUTEX_H_
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/condvar.h>
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#include <sys/kernel.h>
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#include <linux/mutex.h>
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struct ww_class {
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const char *mutex_name;
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};
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struct ww_acquire_ctx {
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};
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struct ww_mutex {
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struct mutex base;
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struct cv condvar;
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struct ww_acquire_ctx *ctx;
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};
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#define DEFINE_WW_CLASS(name) \
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struct ww_class name = { \
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.mutex_name = mutex_name(#name "_mutex") \
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}
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#define DEFINE_WW_MUTEX(name, ww_class) \
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struct ww_mutex name; \
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static void name##_init(void *arg) \
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{ \
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ww_mutex_init(&name, &ww_class); \
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} \
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SYSINIT(name, SI_SUB_LOCK, SI_ORDER_SECOND, name##_init, NULL)
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#define ww_mutex_is_locked(_m) \
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sx_xlocked(&(_m)->base.sx)
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#define ww_mutex_lock_slow(_m, _x) \
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ww_mutex_lock(_m, _x)
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#define ww_mutex_lock_slow_interruptible(_m, _x) \
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ww_mutex_lock_interruptible(_m, _x)
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static inline int __must_check
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ww_mutex_trylock(struct ww_mutex *lock)
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{
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return (mutex_trylock(&lock->base));
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}
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extern int linux_ww_mutex_lock_sub(struct ww_mutex *, int catch_signal);
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static inline int
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ww_mutex_lock(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
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{
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if (MUTEX_SKIP())
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return (0);
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else if ((struct thread *)SX_OWNER(lock->base.sx.sx_lock) == curthread)
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return (-EALREADY);
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else
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return (linux_ww_mutex_lock_sub(lock, 0));
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}
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static inline int
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ww_mutex_lock_interruptible(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
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{
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if (MUTEX_SKIP())
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return (0);
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else if ((struct thread *)SX_OWNER(lock->base.sx.sx_lock) == curthread)
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return (-EALREADY);
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else
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return (linux_ww_mutex_lock_sub(lock, 1));
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}
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extern void linux_ww_mutex_unlock_sub(struct ww_mutex *);
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static inline void
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ww_mutex_unlock(struct ww_mutex *lock)
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{
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if (MUTEX_SKIP())
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return;
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else
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linux_ww_mutex_unlock_sub(lock);
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}
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static inline void
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ww_mutex_destroy(struct ww_mutex *lock)
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{
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cv_destroy(&lock->condvar);
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mutex_destroy(&lock->base);
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}
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static inline void
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ww_acquire_init(struct ww_acquire_ctx *ctx, struct ww_class *ww_class)
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{
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}
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static inline void
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ww_mutex_init(struct ww_mutex *lock, struct ww_class *ww_class)
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{
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linux_mutex_init(&lock->base, ww_class->mutex_name, SX_NOWITNESS);
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cv_init(&lock->condvar, "lkpi-ww");
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}
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static inline void
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ww_acquire_fini(struct ww_acquire_ctx *ctx)
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{
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}
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static inline void
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ww_acquire_done(struct ww_acquire_ctx *ctx)
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{
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}
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#endif /* _LINUX_WW_MUTEX_H_ */
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