xref: /src/sys/external/bsd/drm2/include/linux/hardirq.h

/*	$NetBSD: hardirq.h,v 1.2 2018/08/27 13:37:37 riastradh Exp $	*/

/*-
 * Copyright (c) 2018 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Taylor R. Campbell.
 *
 * 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, 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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	_LINUX_HARDIRQ_H_
#define	_LINUX_HARDIRQ_H_

#include <sys/types.h>
#include <sys/kernel.h>
#include <sys/null.h>
#include <sys/xcall.h>

static inline void
synchronize_irq_xc(void *a, void *b)
{
}

/*
 * synchronize(irq)
 *
 *	Wait for all interrupt handlers servicing irq to complete on
 *	all CPUs.  We just do a low-priority cross-call broadcast to
 *	all CPUs, which can't run until interrupt handlers are done
 *	running.
 */
static inline void
synchronize_irq(int irq)
{

	if (!cold)
		xc_wait(xc_broadcast(0, synchronize_irq_xc, NULL, NULL));
}

#endif	/* _LINUX_HARDIRQ_H_ */