1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2003 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/conf.h> 30 #include <sys/sysmacros.h> 31 #include <sys/async.h> 32 33 static bus_func_desc_t *bfd_list = NULL; /* list of busfunc descriptors */ 34 kmutex_t bfd_lock; /* lock protecting bfd_list */ 35 36 /* 37 * Register a new bus function. We expect this function to be called from a 38 * driver attach or detach routine, so we can safely perform a sleeping 39 * allocation here. We just insert the new element at the head of the list. 40 * For more information on bus_func semantics, refer to sun4u/sys/async.h. 41 */ 42 void 43 bus_func_register(int type, busfunc_t func, void *arg) 44 { 45 bus_func_desc_t *bfd = kmem_alloc(sizeof (bus_func_desc_t), KM_SLEEP); 46 47 bfd->bf_type = type; 48 bfd->bf_func = func; 49 bfd->bf_arg = arg; 50 51 mutex_enter(&bfd_lock); 52 bfd->bf_next = bfd_list; 53 bfd_list = bfd; 54 mutex_exit(&bfd_lock); 55 } 56 57 /* 58 * Unregister the specified bus function. We only delete an element that 59 * exactly matches the specified (type, func, arg) tuple. We expect this 60 * function to only be called from driver detach context. 61 */ 62 void 63 bus_func_unregister(int type, busfunc_t func, void *arg) 64 { 65 bus_func_desc_t *bfd, **pp; 66 67 mutex_enter(&bfd_lock); 68 pp = &bfd_list; 69 70 for (bfd = bfd_list; bfd != NULL; bfd = bfd->bf_next) { 71 if (bfd->bf_type == type && bfd->bf_func == func && 72 bfd->bf_arg == arg) { 73 *pp = bfd->bf_next; 74 break; 75 } 76 pp = &bfd->bf_next; 77 } 78 79 mutex_exit(&bfd_lock); 80 81 if (bfd != NULL) 82 kmem_free(bfd, sizeof (bus_func_desc_t)); 83 } 84 85 /* 86 * Invoke the registered bus functions of the specified type. We return the 87 * maximum of the result values (e.g. BF_FATAL if any call returned BF_FATAL). 88 * This function assumes that (1) the BF_* constants are defined so that the 89 * most fatal error has the highest numerical value, and (2) that the bf_func 90 * callbacks obey the rules described in async.h. 91 */ 92 uint_t 93 bus_func_invoke(int type) 94 { 95 bus_func_desc_t *bfd; 96 uint_t err = BF_NONE; 97 98 mutex_enter(&bfd_lock); 99 100 for (bfd = bfd_list; bfd != NULL; bfd = bfd->bf_next) { 101 if (bfd->bf_type == type) { 102 uint_t status = bfd->bf_func(bfd->bf_arg); 103 err = MAX(err, status); 104 } 105 } 106 107 mutex_exit(&bfd_lock); 108 return (err); 109 } 110