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 #include <sys/thread2.h> 48 49 /* 50 * Autoconfiguration subroutines. 51 */ 52 53 /* 54 * "Interrupt driven config" functions. 55 */ 56 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list = 57 TAILQ_HEAD_INITIALIZER(intr_config_hook_list); 58 59 60 /* ARGSUSED */ 61 static void run_interrupt_driven_config_hooks (void *dummy); 62 static int ran_config_hooks; 63 static struct lock intr_config_lk = LOCK_INITIALIZER("intrcfg", 0, 0); 64 65 static void 66 run_interrupt_driven_config_hooks(void *dummy) 67 { 68 struct intr_config_hook *hook_entry; 69 int save_ticks = ticks; 70 int save_count; 71 int waiting; 72 73 lockmgr(&intr_config_lk, LK_EXCLUSIVE); 74 save_count = ran_config_hooks++; 75 while (!TAILQ_EMPTY(&intr_config_hook_list)) { 76 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) { 77 if (hook_entry->ich_ran == 0) { 78 hook_entry->ich_ran = 1; 79 lockmgr(&intr_config_lk, LK_RELEASE); 80 (*hook_entry->ich_func)(hook_entry->ich_arg); 81 lockmgr(&intr_config_lk, LK_EXCLUSIVE); 82 break; 83 } 84 } 85 if (hook_entry) 86 continue; 87 if (TAILQ_EMPTY(&intr_config_hook_list)) 88 break; 89 90 waiting = (ticks - save_ticks + 1) / hz; 91 92 if (waiting >= 10 && (waiting % 10) == 0) { 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 if (save_count || waiting >= 30) { 104 kprintf("Giving up, interrupt routing is " 105 "probably hosed\n"); 106 break; 107 } 108 } 109 lksleep(&intr_config_hook_list, &intr_config_lk, 110 0, "conifhk", hz); 111 ++waiting; 112 } 113 lockmgr(&intr_config_lk, LK_RELEASE); 114 115 /* 116 * Terrible hack to give U4B (usb) a chance to configure, else 117 * the root mount might not see a valid usb device. This can happen 118 * because the AHCI devices might have already finished probing 119 * before the usb ports are even registered. 120 */ 121 #ifndef _KERNEL_VIRTUAL 122 if (save_count == 0) { 123 while (ticks - save_ticks < 5*hz) 124 tsleep(&intr_config_hook_list, 0, "delay", hz / 10); 125 } 126 #endif 127 128 } 129 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST, 130 run_interrupt_driven_config_hooks, NULL); 131 132 /* 133 * Register a hook that will be called after "cold" 134 * autoconfiguration is complete and interrupts can 135 * be used to complete initialization. 136 */ 137 int 138 config_intrhook_establish(struct intr_config_hook *hook) 139 { 140 struct intr_config_hook *hook_entry; 141 142 lockmgr(&intr_config_lk, LK_EXCLUSIVE); 143 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 144 hook_entry != NULL; 145 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) { 146 if (hook_entry == hook) 147 break; 148 if (hook_entry->ich_order > hook->ich_order) 149 break; 150 } 151 if (hook_entry == hook) { 152 kprintf("config_intrhook_establish: establishing an " 153 "already established hook.\n"); 154 lockmgr(&intr_config_lk, LK_RELEASE); 155 return (1); 156 } 157 hook->ich_ran = 0; 158 159 /* 160 * Insert 161 */ 162 if (hook_entry) 163 TAILQ_INSERT_BEFORE(hook_entry, hook, ich_links); 164 else 165 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links); 166 167 /* 168 * Late hook, run immediately. 169 */ 170 if (ran_config_hooks) { 171 lockmgr(&intr_config_lk, LK_RELEASE); 172 run_interrupt_driven_config_hooks(NULL); 173 lockmgr(&intr_config_lk, LK_EXCLUSIVE); 174 } 175 lockmgr(&intr_config_lk, LK_RELEASE); 176 177 return (0); 178 } 179 180 void 181 config_intrhook_disestablish(struct intr_config_hook *hook) 182 { 183 struct intr_config_hook *hook_entry; 184 185 lockmgr(&intr_config_lk, LK_EXCLUSIVE); 186 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 187 hook_entry != NULL; 188 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) { 189 if (hook_entry == hook) 190 break; 191 } 192 if (hook_entry == NULL) { 193 lockmgr(&intr_config_lk, LK_RELEASE); 194 panic("config_intrhook_disestablish: disestablishing an " 195 "unestablished hook (%p)", hook); 196 } 197 198 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links); 199 /* Wakeup anyone watching the list */ 200 wakeup(&intr_config_hook_list); 201 lockmgr(&intr_config_lk, LK_RELEASE); 202 } 203