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 64 static void 65 run_interrupt_driven_config_hooks(void *dummy) 66 { 67 struct intr_config_hook *hook_entry; 68 int waiting; 69 #ifndef _KERNEL_VIRTUAL 70 int save_ticks = ticks; 71 #endif 72 waiting = 0; 73 74 ran_config_hooks = 1; 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 (*hook_entry->ich_func)(hook_entry->ich_arg); 80 break; 81 } 82 } 83 if (hook_entry) 84 continue; 85 if (TAILQ_EMPTY(&intr_config_hook_list)) 86 break; 87 88 if (waiting >= 20 && (waiting % 10) == 0) { 89 crit_enter(); 90 kprintf("**WARNING** waiting for the following device " 91 "to finish configuring:\n"); 92 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, 93 ich_links) { 94 kprintf(" %s:\tfunc=%p arg=%p\n", 95 (hook_entry->ich_desc ? 96 hook_entry->ich_desc : "?"), 97 hook_entry->ich_func, 98 hook_entry->ich_arg); 99 } 100 crit_exit(); 101 if (waiting >= 60) { 102 kprintf("Giving up, interrupt routing is " 103 "probably hosed\n"); 104 break; 105 } 106 } 107 tsleep(&intr_config_hook_list, 0, "conifhk", hz); 108 ++waiting; 109 } 110 111 /* 112 * Terrible hack to give U4B (usb) a chance to configure, else 113 * the root mount might not see a valid usb device. This can happen 114 * because the AHCI devices might have already finished probing 115 * before the usb ports are even registered. 116 */ 117 #ifndef _KERNEL_VIRTUAL 118 while (ticks - save_ticks < 5*hz) 119 tsleep(&intr_config_hook_list, 0, "delay", hz / 10); 120 #endif 121 122 } 123 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST, 124 run_interrupt_driven_config_hooks, NULL); 125 126 /* 127 * Register a hook that will be called after "cold" 128 * autoconfiguration is complete and interrupts can 129 * be used to complete initialization. 130 */ 131 int 132 config_intrhook_establish(struct intr_config_hook *hook) 133 { 134 struct intr_config_hook *hook_entry; 135 136 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 137 hook_entry != NULL; 138 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) { 139 if (hook_entry == hook) 140 break; 141 if (hook_entry->ich_order > hook->ich_order) 142 break; 143 } 144 if (hook_entry == hook) { 145 kprintf("config_intrhook_establish: establishing an " 146 "already established hook.\n"); 147 return (1); 148 } 149 hook->ich_ran = 0; 150 if (hook_entry) 151 TAILQ_INSERT_BEFORE(hook_entry, hook, ich_links); 152 else 153 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links); 154 155 /* 156 * Late hook, run immediately. 157 */ 158 if (ran_config_hooks) 159 run_interrupt_driven_config_hooks(NULL); 160 return (0); 161 } 162 163 void 164 config_intrhook_disestablish(struct intr_config_hook *hook) 165 { 166 struct intr_config_hook *hook_entry; 167 168 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); 169 hook_entry != NULL; 170 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) 171 if (hook_entry == hook) 172 break; 173 if (hook_entry == NULL) 174 panic("config_intrhook_disestablish: disestablishing an " 175 "unestablished hook"); 176 177 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links); 178 /* Wakeup anyone watching the list */ 179 wakeup(&intr_config_hook_list); 180 } 181