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 */ 42 43 #include <sys/param.h> 44 #include <sys/kernel.h> 45 #include <sys/systm.h> 46 #include <sys/thread.h> 47 48 /* 49 * Autoconfiguration subroutines. 50 */ 51 52 /* 53 * "Interrupt driven config" functions. 54 */ 55 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list = 56 TAILQ_HEAD_INITIALIZER(intr_config_hook_list); 57 58 59 /* ARGSUSED */ 60 static void run_interrupt_driven_config_hooks (void *dummy); 61 static int ran_config_hooks; 62 static struct lock intr_config_lk = LOCK_INITIALIZER("intrcfg", 0, 0); 63 64 static void 65 run_interrupt_driven_config_hooks(void *dummy) 66 { 67 struct intr_config_hook *hook_entry; 68 int save_ticks = ticks; 69 int save_count; 70 int waiting; 71 72 lockmgr(&intr_config_lk, LK_EXCLUSIVE); 73 save_count = ran_config_hooks++; 74 while (!TAILQ_EMPTY(&intr_config_hook_list)) { 75 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) { 76 if (hook_entry->ich_ran == 0) { 77 hook_entry->ich_ran = 1; 78 lockmgr(&intr_config_lk, LK_RELEASE); 79 (*hook_entry->ich_func)(hook_entry->ich_arg); 80 lockmgr(&intr_config_lk, LK_EXCLUSIVE); 81 break; 82 } 83 } 84 if (hook_entry) 85 continue; 86 if (TAILQ_EMPTY(&intr_config_hook_list)) 87 break; 88 89 waiting = (ticks - save_ticks + 1) / hz; 90 91 if (waiting >= 10 && (waiting % 10) == 0) { 92 kprintf("**WARNING** waiting for the following device " 93 "to finish configuring:\n"); 94 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, 95 ich_links) { 96 kprintf(" %s:\tfunc=%p arg=%p\n", 97 (hook_entry->ich_desc ? 98 hook_entry->ich_desc : "?"), 99 hook_entry->ich_func, 100 hook_entry->ich_arg); 101 } 102 if (save_count || waiting >= 30) { 103 kprintf("Giving up, interrupt routing is " 104 "probably hosed\n"); 105 break; 106 } 107 } 108 lksleep(&intr_config_hook_list, &intr_config_lk, 109 0, "conifhk", hz); 110 ++waiting; 111 } 112 lockmgr(&intr_config_lk, LK_RELEASE); 113 114 /* 115 * Terrible hack to give U4B (usb) a chance to configure, else 116 * the root mount might not see a valid usb device. This can happen 117 * because the AHCI devices might have already finished probing 118 * before the usb ports are even registered. 119 */ 120 #ifndef _KERNEL_VIRTUAL 121 if (save_count == 0) { 122 while (ticks - save_ticks < 5*hz) 123 tsleep(&intr_config_hook_list, 0, "delay", hz / 10); 124 } 125 #endif 126 127 } 128 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST, 129 run_interrupt_driven_config_hooks, NULL); 130 131 /* 132 * Register a hook that will be called after "cold" 133 * autoconfiguration is complete and interrupts can 134 * be used to complete initialization. 135 */ 136 int 137 config_intrhook_establish(struct intr_config_hook *hook) 138 { 139 struct intr_config_hook *hook_entry; 140 141 lockmgr(&intr_config_lk, LK_EXCLUSIVE); 142 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 143 hook_entry != NULL; 144 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) { 145 if (hook_entry == hook) 146 break; 147 if (hook_entry->ich_order > hook->ich_order) 148 break; 149 } 150 if (hook_entry == hook) { 151 kprintf("config_intrhook_establish: establishing an " 152 "already established hook.\n"); 153 lockmgr(&intr_config_lk, LK_RELEASE); 154 return (1); 155 } 156 hook->ich_ran = 0; 157 158 /* 159 * Insert 160 */ 161 if (hook_entry) 162 TAILQ_INSERT_BEFORE(hook_entry, hook, ich_links); 163 else 164 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links); 165 166 /* 167 * Late hook, run immediately. 168 */ 169 if (ran_config_hooks) { 170 lockmgr(&intr_config_lk, LK_RELEASE); 171 run_interrupt_driven_config_hooks(NULL); 172 lockmgr(&intr_config_lk, LK_EXCLUSIVE); 173 } 174 lockmgr(&intr_config_lk, LK_RELEASE); 175 176 return (0); 177 } 178 179 void 180 config_intrhook_disestablish(struct intr_config_hook *hook) 181 { 182 struct intr_config_hook *hook_entry; 183 184 lockmgr(&intr_config_lk, LK_EXCLUSIVE); 185 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 186 hook_entry != NULL; 187 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) { 188 if (hook_entry == hook) 189 break; 190 } 191 if (hook_entry == NULL) { 192 lockmgr(&intr_config_lk, LK_RELEASE); 193 panic("config_intrhook_disestablish: disestablishing an " 194 "unestablished hook (%p)", hook); 195 } 196 197 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links); 198 /* Wakeup anyone watching the list */ 199 wakeup(&intr_config_hook_list); 200 lockmgr(&intr_config_lk, LK_RELEASE); 201 } 202