1 /* 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * All advertising materials mentioning features or use of this software 10 * must display the following acknowledgement: 11 * This product includes software developed by the University of 12 * California, Lawrence Berkeley Laboratories. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by the University of 25 * California, Berkeley and its contributors. 26 * 4. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 * 42 * @(#)subr_autoconf.c 8.1 (Berkeley) 6/10/93 43 * 44 * $FreeBSD: src/sys/kern/subr_autoconf.c,v 1.14 1999/10/05 21:19:41 n_hibma Exp $ 45 * $DragonFly: src/sys/kern/subr_autoconf.c,v 1.9 2007/07/28 23:24:33 dillon Exp $ 46 */ 47 48 #include <sys/param.h> 49 #include <sys/kernel.h> 50 #include <sys/systm.h> 51 #include <sys/thread.h> 52 #include <sys/thread2.h> 53 54 /* 55 * Autoconfiguration subroutines. 56 */ 57 58 /* 59 * "Interrupt driven config" functions. 60 */ 61 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list = 62 TAILQ_HEAD_INITIALIZER(intr_config_hook_list); 63 64 65 /* ARGSUSED */ 66 static void run_interrupt_driven_config_hooks (void *dummy); 67 68 static void 69 run_interrupt_driven_config_hooks(void *dummy) 70 { 71 struct intr_config_hook *hook_entry, *next_entry; 72 int waiting; 73 74 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 75 hook_entry != NULL; 76 hook_entry = next_entry) { 77 next_entry = TAILQ_NEXT(hook_entry, ich_links); 78 (*hook_entry->ich_func)(hook_entry->ich_arg); 79 } 80 81 waiting = 0; 82 while (!TAILQ_EMPTY(&intr_config_hook_list)) { 83 if (waiting >= 20) { 84 crit_enter(); 85 kprintf("**WARNING** waiting for the following device to finish configuring:\n"); 86 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) { 87 kprintf(" %s:\tfunc=%p arg=%p\n", 88 (hook_entry->ich_desc ? 89 hook_entry->ich_desc : "?"), 90 hook_entry->ich_func, 91 hook_entry->ich_arg); 92 } 93 crit_exit(); 94 if (waiting >= 60) { 95 kprintf("Giving up, interrupt routing is probably hosed\n"); 96 break; 97 } 98 } 99 tsleep(&intr_config_hook_list, 0, "conifhk", hz * 10); 100 waiting += 10; 101 } 102 } 103 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST, 104 run_interrupt_driven_config_hooks, NULL) 105 106 /* 107 * Register a hook that will be called after "cold" 108 * autoconfiguration is complete and interrupts can 109 * be used to complete initialization. 110 */ 111 int 112 config_intrhook_establish(struct intr_config_hook *hook) 113 { 114 struct intr_config_hook *hook_entry; 115 116 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 117 hook_entry != NULL; 118 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) { 119 if (hook_entry == hook) 120 break; 121 if (hook_entry->ich_order > hook->ich_order) 122 break; 123 } 124 if (hook_entry == hook) { 125 kprintf("config_intrhook_establish: establishing an " 126 "already established hook.\n"); 127 return (1); 128 } 129 if (hook_entry) 130 TAILQ_INSERT_BEFORE(hook_entry, hook, ich_links); 131 else 132 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links); 133 if (cold == 0) 134 /* XXX Sufficient for modules loaded after initial config??? */ 135 run_interrupt_driven_config_hooks(NULL); 136 return (0); 137 } 138 139 void 140 config_intrhook_disestablish(struct intr_config_hook *hook) 141 { 142 struct intr_config_hook *hook_entry; 143 144 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 145 hook_entry != NULL; 146 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) 147 if (hook_entry == hook) 148 break; 149 if (hook_entry == NULL) 150 panic("config_intrhook_disestablish: disestablishing an " 151 "unestablished hook"); 152 153 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links); 154 /* Wakeup anyone watching the list */ 155 wakeup(&intr_config_hook_list); 156 } 157