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 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)subr_autoconf.c 8.1 (Berkeley) 6/10/93 34 * 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include "opt_ddb.h" 41 42 #include <sys/param.h> 43 #include <sys/kernel.h> 44 #include <sys/linker.h> 45 #include <sys/lock.h> 46 #include <sys/mutex.h> 47 #include <sys/systm.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 static struct mtx intr_config_hook_lock; 59 MTX_SYSINIT(intr_config_hook, &intr_config_hook_lock, "intr config", MTX_DEF); 60 61 /* ARGSUSED */ 62 static void run_interrupt_driven_config_hooks(void *dummy); 63 64 /* 65 * If we wait too long for an interrupt-driven config hook to return, print 66 * a diagnostic. 67 */ 68 #define WARNING_INTERVAL_SECS 60 69 static void 70 run_interrupt_driven_config_hooks_warning(int warned) 71 { 72 struct intr_config_hook *hook_entry; 73 char namebuf[64]; 74 long offset; 75 76 if (warned < 6) { 77 printf("run_interrupt_driven_hooks: still waiting after %d " 78 "seconds for", warned * WARNING_INTERVAL_SECS); 79 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) { 80 if (linker_search_symbol_name( 81 (caddr_t)hook_entry->ich_func, namebuf, 82 sizeof(namebuf), &offset) == 0) 83 printf(" %s", namebuf); 84 else 85 printf(" %p", hook_entry->ich_func); 86 } 87 printf("\n"); 88 } 89 KASSERT(warned < 6, 90 ("run_interrupt_driven_config_hooks: waited too long")); 91 } 92 93 static void 94 run_interrupt_driven_config_hooks(void *dummy) 95 { 96 struct intr_config_hook *hook_entry, *next_entry; 97 int warned; 98 99 mtx_lock(&intr_config_hook_lock); 100 TAILQ_FOREACH_SAFE(hook_entry, &intr_config_hook_list, ich_links, 101 next_entry) { 102 mtx_unlock(&intr_config_hook_lock); 103 (*hook_entry->ich_func)(hook_entry->ich_arg); 104 mtx_lock(&intr_config_hook_lock); 105 } 106 107 warned = 0; 108 while (!TAILQ_EMPTY(&intr_config_hook_list)) { 109 if (msleep(&intr_config_hook_list, &intr_config_hook_lock, 110 PCONFIG, "conifhk", WARNING_INTERVAL_SECS * hz) == 111 EWOULDBLOCK) { 112 mtx_unlock(&intr_config_hook_lock); 113 warned++; 114 run_interrupt_driven_config_hooks_warning(warned); 115 mtx_lock(&intr_config_hook_lock); 116 } 117 } 118 mtx_unlock(&intr_config_hook_lock); 119 } 120 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST, 121 run_interrupt_driven_config_hooks, NULL); 122 123 /* 124 * Register a hook that will be called after "cold" 125 * autoconfiguration is complete and interrupts can 126 * be used to complete initialization. 127 */ 128 int 129 config_intrhook_establish(struct intr_config_hook *hook) 130 { 131 struct intr_config_hook *hook_entry; 132 133 mtx_lock(&intr_config_hook_lock); 134 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) 135 if (hook_entry == hook) 136 break; 137 if (hook_entry != NULL) { 138 mtx_unlock(&intr_config_hook_lock); 139 printf("config_intrhook_establish: establishing an " 140 "already established hook.\n"); 141 return (1); 142 } 143 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links); 144 mtx_unlock(&intr_config_hook_lock); 145 if (cold == 0) 146 /* XXX Sufficient for modules loaded after initial config??? */ 147 run_interrupt_driven_config_hooks(NULL); 148 return (0); 149 } 150 151 void 152 config_intrhook_disestablish(struct intr_config_hook *hook) 153 { 154 struct intr_config_hook *hook_entry; 155 156 mtx_lock(&intr_config_hook_lock); 157 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) 158 if (hook_entry == hook) 159 break; 160 if (hook_entry == NULL) 161 panic("config_intrhook_disestablish: disestablishing an " 162 "unestablished hook"); 163 164 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links); 165 166 /* Wakeup anyone watching the list */ 167 wakeup(&intr_config_hook_list); 168 mtx_unlock(&intr_config_hook_lock); 169 } 170 171 #ifdef DDB 172 #include <ddb/ddb.h> 173 174 DB_SHOW_COMMAND(conifhk, db_show_conifhk) 175 { 176 struct intr_config_hook *hook_entry; 177 char namebuf[64]; 178 long offset; 179 180 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) { 181 if (linker_ddb_search_symbol_name( 182 (caddr_t)hook_entry->ich_func, namebuf, sizeof(namebuf), 183 &offset) == 0) { 184 db_printf("hook: %p at %s+%#lx arg: %p\n", 185 hook_entry->ich_func, namebuf, offset, 186 hook_entry->ich_arg); 187 } else { 188 db_printf("hook: %p at ??+?? arg %p\n", 189 hook_entry->ich_func, hook_entry->ich_arg); 190 } 191 } 192 } 193 #endif /* DDB */ 194