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 static int ran_config_hooks; 68 69 static void 70 run_interrupt_driven_config_hooks(void *dummy) 71 { 72 struct intr_config_hook *hook_entry; 73 int waiting; 74 75 waiting = 0; 76 77 ran_config_hooks = 1; 78 while (!TAILQ_EMPTY(&intr_config_hook_list)) { 79 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) { 80 if (hook_entry->ich_ran == 0) { 81 hook_entry->ich_ran = 1; 82 (*hook_entry->ich_func)(hook_entry->ich_arg); 83 break; 84 } 85 } 86 if (hook_entry) 87 continue; 88 if (TAILQ_EMPTY(&intr_config_hook_list)) 89 break; 90 91 if (waiting >= 20 && (waiting % 10) == 0) { 92 crit_enter(); 93 kprintf("**WARNING** waiting for the following device " 94 "to finish configuring:\n"); 95 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, 96 ich_links) { 97 kprintf(" %s:\tfunc=%p arg=%p\n", 98 (hook_entry->ich_desc ? 99 hook_entry->ich_desc : "?"), 100 hook_entry->ich_func, 101 hook_entry->ich_arg); 102 } 103 crit_exit(); 104 if (waiting >= 60) { 105 kprintf("Giving up, interrupt routing is " 106 "probably hosed\n"); 107 break; 108 } 109 } 110 tsleep(&intr_config_hook_list, 0, "conifhk", hz); 111 ++waiting; 112 } 113 } 114 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST, 115 run_interrupt_driven_config_hooks, NULL) 116 117 /* 118 * Register a hook that will be called after "cold" 119 * autoconfiguration is complete and interrupts can 120 * be used to complete initialization. 121 */ 122 int 123 config_intrhook_establish(struct intr_config_hook *hook) 124 { 125 struct intr_config_hook *hook_entry; 126 127 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 128 hook_entry != NULL; 129 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) { 130 if (hook_entry == hook) 131 break; 132 if (hook_entry->ich_order > hook->ich_order) 133 break; 134 } 135 if (hook_entry == hook) { 136 kprintf("config_intrhook_establish: establishing an " 137 "already established hook.\n"); 138 return (1); 139 } 140 hook->ich_ran = 0; 141 if (hook_entry) 142 TAILQ_INSERT_BEFORE(hook_entry, hook, ich_links); 143 else 144 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links); 145 146 /* 147 * Late hook, run immediately. 148 */ 149 if (ran_config_hooks) 150 run_interrupt_driven_config_hooks(NULL); 151 return (0); 152 } 153 154 void 155 config_intrhook_disestablish(struct intr_config_hook *hook) 156 { 157 struct intr_config_hook *hook_entry; 158 159 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 160 hook_entry != NULL; 161 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) 162 if (hook_entry == hook) 163 break; 164 if (hook_entry == NULL) 165 panic("config_intrhook_disestablish: disestablishing an " 166 "unestablished hook"); 167 168 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links); 169 /* Wakeup anyone watching the list */ 170 wakeup(&intr_config_hook_list); 171 } 172