1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2003 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate #include <sys/conf.h> 30*0Sstevel@tonic-gate #include <sys/sysmacros.h> 31*0Sstevel@tonic-gate #include <sys/async.h> 32*0Sstevel@tonic-gate 33*0Sstevel@tonic-gate static bus_func_desc_t *bfd_list = NULL; /* list of busfunc descriptors */ 34*0Sstevel@tonic-gate kmutex_t bfd_lock; /* lock protecting bfd_list */ 35*0Sstevel@tonic-gate 36*0Sstevel@tonic-gate /* 37*0Sstevel@tonic-gate * Register a new bus function. We expect this function to be called from a 38*0Sstevel@tonic-gate * driver attach or detach routine, so we can safely perform a sleeping 39*0Sstevel@tonic-gate * allocation here. We just insert the new element at the head of the list. 40*0Sstevel@tonic-gate * For more information on bus_func semantics, refer to sun4u/sys/async.h. 41*0Sstevel@tonic-gate */ 42*0Sstevel@tonic-gate void 43*0Sstevel@tonic-gate bus_func_register(int type, busfunc_t func, void *arg) 44*0Sstevel@tonic-gate { 45*0Sstevel@tonic-gate bus_func_desc_t *bfd = kmem_alloc(sizeof (bus_func_desc_t), KM_SLEEP); 46*0Sstevel@tonic-gate 47*0Sstevel@tonic-gate bfd->bf_type = type; 48*0Sstevel@tonic-gate bfd->bf_func = func; 49*0Sstevel@tonic-gate bfd->bf_arg = arg; 50*0Sstevel@tonic-gate 51*0Sstevel@tonic-gate mutex_enter(&bfd_lock); 52*0Sstevel@tonic-gate bfd->bf_next = bfd_list; 53*0Sstevel@tonic-gate bfd_list = bfd; 54*0Sstevel@tonic-gate mutex_exit(&bfd_lock); 55*0Sstevel@tonic-gate } 56*0Sstevel@tonic-gate 57*0Sstevel@tonic-gate /* 58*0Sstevel@tonic-gate * Unregister the specified bus function. We only delete an element that 59*0Sstevel@tonic-gate * exactly matches the specified (type, func, arg) tuple. We expect this 60*0Sstevel@tonic-gate * function to only be called from driver detach context. 61*0Sstevel@tonic-gate */ 62*0Sstevel@tonic-gate void 63*0Sstevel@tonic-gate bus_func_unregister(int type, busfunc_t func, void *arg) 64*0Sstevel@tonic-gate { 65*0Sstevel@tonic-gate bus_func_desc_t *bfd, **pp; 66*0Sstevel@tonic-gate 67*0Sstevel@tonic-gate mutex_enter(&bfd_lock); 68*0Sstevel@tonic-gate pp = &bfd_list; 69*0Sstevel@tonic-gate 70*0Sstevel@tonic-gate for (bfd = bfd_list; bfd != NULL; bfd = bfd->bf_next) { 71*0Sstevel@tonic-gate if (bfd->bf_type == type && bfd->bf_func == func && 72*0Sstevel@tonic-gate bfd->bf_arg == arg) { 73*0Sstevel@tonic-gate *pp = bfd->bf_next; 74*0Sstevel@tonic-gate break; 75*0Sstevel@tonic-gate } 76*0Sstevel@tonic-gate pp = &bfd->bf_next; 77*0Sstevel@tonic-gate } 78*0Sstevel@tonic-gate 79*0Sstevel@tonic-gate mutex_exit(&bfd_lock); 80*0Sstevel@tonic-gate 81*0Sstevel@tonic-gate if (bfd != NULL) 82*0Sstevel@tonic-gate kmem_free(bfd, sizeof (bus_func_desc_t)); 83*0Sstevel@tonic-gate } 84*0Sstevel@tonic-gate 85*0Sstevel@tonic-gate /* 86*0Sstevel@tonic-gate * Invoke the registered bus functions of the specified type. We return the 87*0Sstevel@tonic-gate * maximum of the result values (e.g. BF_FATAL if any call returned BF_FATAL). 88*0Sstevel@tonic-gate * This function assumes that (1) the BF_* constants are defined so that the 89*0Sstevel@tonic-gate * most fatal error has the highest numerical value, and (2) that the bf_func 90*0Sstevel@tonic-gate * callbacks obey the rules described in async.h. 91*0Sstevel@tonic-gate */ 92*0Sstevel@tonic-gate uint_t 93*0Sstevel@tonic-gate bus_func_invoke(int type) 94*0Sstevel@tonic-gate { 95*0Sstevel@tonic-gate bus_func_desc_t *bfd; 96*0Sstevel@tonic-gate uint_t err = BF_NONE; 97*0Sstevel@tonic-gate 98*0Sstevel@tonic-gate mutex_enter(&bfd_lock); 99*0Sstevel@tonic-gate 100*0Sstevel@tonic-gate for (bfd = bfd_list; bfd != NULL; bfd = bfd->bf_next) { 101*0Sstevel@tonic-gate if (bfd->bf_type == type) { 102*0Sstevel@tonic-gate uint_t status = bfd->bf_func(bfd->bf_arg); 103*0Sstevel@tonic-gate err = MAX(err, status); 104*0Sstevel@tonic-gate } 105*0Sstevel@tonic-gate } 106*0Sstevel@tonic-gate 107*0Sstevel@tonic-gate mutex_exit(&bfd_lock); 108*0Sstevel@tonic-gate return (err); 109*0Sstevel@tonic-gate } 110