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/* $NetBSD: linux_notifier.c,v 1.2 2021/12/19 11:47:08 riastradh Exp $ */
/*-
* Copyright (c) 2021 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_notifier.c,v 1.2 2021/12/19 11:47:08 riastradh Exp $");
#include <sys/types.h>
#include <sys/pserialize.h>
#include <sys/xcall.h>
#include <linux/notifier.h>
#include <linux/spinlock.h>
void
ATOMIC_INIT_NOTIFIER_HEAD(struct atomic_notifier_head *H)
{
spin_lock_init(&H->anh_lock);
PSLIST_INIT(&H->anh_list);
}
void
ATOMIC_CLEANUP_NOTIFIER_HEAD(struct atomic_notifier_head *H)
{
PSLIST_DESTROY(&H->anh_list);
spin_lock_destroy(&H->anh_lock);
}
void
atomic_notifier_chain_register(struct atomic_notifier_head *H,
struct notifier_block *B)
{
spin_lock(&H->anh_lock);
PSLIST_WRITER_INSERT_HEAD(&H->anh_list, B, nb_entry);
spin_unlock(&H->anh_lock);
}
void
atomic_notifier_chain_unregister(struct atomic_notifier_head *H,
struct notifier_block *B)
{
spin_lock(&H->anh_lock);
PSLIST_WRITER_REMOVE(B, nb_entry);
spin_unlock(&H->anh_lock);
xc_barrier(0);
}
void
atomic_notifier_call_chain(struct atomic_notifier_head *H,
unsigned long arg0, void *arg1)
{
struct notifier_block *B;
int s;
s = pserialize_read_enter();
PSLIST_READER_FOREACH(B, &H->anh_list, struct notifier_block, nb_entry)
{
if ((*B->notifier_call)(B, arg0, arg1) == NOTIFY_DONE)
break;
}
pserialize_read_exit(s);
}
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