/* $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); } |