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. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)subr_autoconf.c 8.1 (Berkeley) 6/10/93 39 * 40 * $FreeBSD: src/sys/kern/subr_autoconf.c,v 1.14 1999/10/05 21:19:41 n_hibma Exp $ 41 * $DragonFly: src/sys/kern/subr_autoconf.c,v 1.9 2007/07/28 23:24:33 dillon Exp $ 42 */ 43 44 #include <sys/param.h> 45 #include <sys/kernel.h> 46 #include <sys/systm.h> 47 #include <sys/thread.h> 48 #include <sys/thread2.h> 49 50 /* 51 * Autoconfiguration subroutines. 52 */ 53 54 /* 55 * "Interrupt driven config" functions. 56 */ 57 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list = 58 TAILQ_HEAD_INITIALIZER(intr_config_hook_list); 59 60 61 /* ARGSUSED */ 62 static void run_interrupt_driven_config_hooks (void *dummy); 63 static int ran_config_hooks; 64 65 static void 66 run_interrupt_driven_config_hooks(void *dummy) 67 { 68 struct intr_config_hook *hook_entry; 69 int waiting; 70 #ifndef _KERNEL_VIRTUAL 71 int save_ticks = ticks; 72 #endif 73 waiting = 0; 74 75 ran_config_hooks = 1; 76 while (!TAILQ_EMPTY(&intr_config_hook_list)) { 77 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) { 78 if (hook_entry->ich_ran == 0) { 79 hook_entry->ich_ran = 1; 80 (*hook_entry->ich_func)(hook_entry->ich_arg); 81 break; 82 } 83 } 84 if (hook_entry) 85 continue; 86 if (TAILQ_EMPTY(&intr_config_hook_list)) 87 break; 88 89 if (waiting >= 20 && (waiting % 10) == 0) { 90 crit_enter(); 91 kprintf("**WARNING** waiting for the following device " 92 "to finish configuring:\n"); 93 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, 94 ich_links) { 95 kprintf(" %s:\tfunc=%p arg=%p\n", 96 (hook_entry->ich_desc ? 97 hook_entry->ich_desc : "?"), 98 hook_entry->ich_func, 99 hook_entry->ich_arg); 100 } 101 crit_exit(); 102 if (waiting >= 60) { 103 kprintf("Giving up, interrupt routing is " 104 "probably hosed\n"); 105 break; 106 } 107 } 108 tsleep(&intr_config_hook_list, 0, "conifhk", hz); 109 ++waiting; 110 } 111 112 /* 113 * Terrible hack to give U4B (usb) a chance to configure, else 114 * the root mount might not see a valid usb device. This can happen 115 * because the AHCI devices might have already finished probing 116 * before the usb ports are even registered. 117 */ 118 #ifndef _KERNEL_VIRTUAL 119 while (ticks - save_ticks < 5*hz) 120 tsleep(&intr_config_hook_list, 0, "delay", hz / 10); 121 #endif 122 123 } 124 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST, 125 run_interrupt_driven_config_hooks, NULL) 126 127 /* 128 * Register a hook that will be called after "cold" 129 * autoconfiguration is complete and interrupts can 130 * be used to complete initialization. 131 */ 132 int 133 config_intrhook_establish(struct intr_config_hook *hook) 134 { 135 struct intr_config_hook *hook_entry; 136 137 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 138 hook_entry != NULL; 139 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) { 140 if (hook_entry == hook) 141 break; 142 if (hook_entry->ich_order > hook->ich_order) 143 break; 144 } 145 if (hook_entry == hook) { 146 kprintf("config_intrhook_establish: establishing an " 147 "already established hook.\n"); 148 return (1); 149 } 150 hook->ich_ran = 0; 151 if (hook_entry) 152 TAILQ_INSERT_BEFORE(hook_entry, hook, ich_links); 153 else 154 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links); 155 156 /* 157 * Late hook, run immediately. 158 */ 159 if (ran_config_hooks) 160 run_interrupt_driven_config_hooks(NULL); 161 return (0); 162 } 163 164 void 165 config_intrhook_disestablish(struct intr_config_hook *hook) 166 { 167 struct intr_config_hook *hook_entry; 168 169 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 170 hook_entry != NULL; 171 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) 172 if (hook_entry == hook) 173 break; 174 if (hook_entry == NULL) 175 panic("config_intrhook_disestablish: disestablishing an " 176 "unestablished hook"); 177 178 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links); 179 /* Wakeup anyone watching the list */ 180 wakeup(&intr_config_hook_list); 181 } 182