/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/conf.h>
#include <sys/sysmacros.h>
#include <sys/async.h>
static bus_func_desc_t *bfd_list = NULL; /* list of busfunc descriptors */
kmutex_t bfd_lock; /* lock protecting bfd_list */
/*
* Register a new bus function. We expect this function to be called from a
* driver attach or detach routine, so we can safely perform a sleeping
* allocation here. We just insert the new element at the head of the list.
* For more information on bus_func semantics, refer to sun4u/sys/async.h.
*/
void
bus_func_register(int type, busfunc_t func, void *arg)
{
bus_func_desc_t *bfd = kmem_alloc(sizeof (bus_func_desc_t), KM_SLEEP);
bfd->bf_type = type;
bfd->bf_func = func;
bfd->bf_arg = arg;
mutex_enter(&bfd_lock);
bfd->bf_next = bfd_list;
bfd_list = bfd;
mutex_exit(&bfd_lock);
}
/*
* Unregister the specified bus function. We only delete an element that
* exactly matches the specified (type, func, arg) tuple. We expect this
* function to only be called from driver detach context.
*/
void
bus_func_unregister(int type, busfunc_t func, void *arg)
{
bus_func_desc_t *bfd, **pp;
mutex_enter(&bfd_lock);
pp = &bfd_list;
for (bfd = bfd_list; bfd != NULL; bfd = bfd->bf_next) {
if (bfd->bf_type == type && bfd->bf_func == func &&
bfd->bf_arg == arg) {
*pp = bfd->bf_next;
break;
}
pp = &bfd->bf_next;
}
mutex_exit(&bfd_lock);
if (bfd != NULL)
kmem_free(bfd, sizeof (bus_func_desc_t));
}
/*
* Invoke the registered bus functions of the specified type. We return the
* maximum of the result values (e.g. BF_FATAL if any call returned BF_FATAL).
* This function assumes that (1) the BF_* constants are defined so that the
* most fatal error has the highest numerical value, and (2) that the bf_func
* callbacks obey the rules described in async.h.
*/
uint_t
bus_func_invoke(int type)
{
bus_func_desc_t *bfd;
uint_t err = BF_NONE;
mutex_enter(&bfd_lock);
for (bfd = bfd_list; bfd != NULL; bfd = bfd->bf_next) {
if (bfd->bf_type == type) {
uint_t status = bfd->bf_func(bfd->bf_arg);
err = MAX(err, status);
}
}
mutex_exit(&bfd_lock);
return (err);
}