subr_autoconf.c revision 180673
178344Sobrien/*- 278344Sobrien * Copyright (c) 1992, 1993 398184Sgordon * The Regents of the University of California. All rights reserved. 498184Sgordon * 578344Sobrien * This software was developed by the Computer Systems Engineering group 678344Sobrien * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 778344Sobrien * contributed to Berkeley. 8128470Sdarrenr * 9113959Smtm * Redistribution and use in source and binary forms, with or without 10126744Spjd * modification, are permitted provided that the following conditions 1178344Sobrien * are met: 1278344Sobrien * 1. Redistributions of source code must retain the above copyright 1378344Sobrien * notice, this list of conditions and the following disclaimer. 1478344Sobrien * 2. Redistributions in binary form must reproduce the above copyright 1598184Sgordon * notice, this list of conditions and the following disclaimer in the 1698184Sgordon * documentation and/or other materials provided with the distribution. 17124618Smtm * 4. Neither the name of the University nor the names of its contributors 1898184Sgordon * may be used to endorse or promote products derived from this software 1978344Sobrien * without specific prior written permission. 2078344Sobrien * 2178344Sobrien * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2278344Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2378344Sobrien * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2498184Sgordon * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2598184Sgordon * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2678344Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2778344Sobrien * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2898184Sgordon * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2978344Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30124928Smux * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31124928Smux * SUCH DAMAGE. 32124928Smux * 33124928Smux * @(#)subr_autoconf.c 8.1 (Berkeley) 6/10/93 34124928Smux * 35124928Smux */ 36124928Smux 37124928Smux#include <sys/cdefs.h> 38124928Smux__FBSDID("$FreeBSD: head/sys/kern/subr_autoconf.c 180673 2008-07-21 20:50:49Z rwatson $"); 3978344Sobrien 4078344Sobrien#include "opt_ddb.h" 4198184Sgordon 42124928Smux#include <sys/param.h> 43104980Sschweikh#include <sys/kernel.h> 44114271Smtm#include <sys/linker.h> 4598184Sgordon#include <sys/lock.h> 46113959Smtm#include <sys/mutex.h> 4798184Sgordon#include <sys/systm.h> 4898184Sgordon 4998184Sgordon/* 5098184Sgordon * Autoconfiguration subroutines. 51106333Sume */ 52106333Sume 5398184Sgordon/* 5498184Sgordon * "Interrupt driven config" functions. 5598184Sgordon */ 5678344Sobrienstatic TAILQ_HEAD(, intr_config_hook) intr_config_hook_list = 5778344Sobrien TAILQ_HEAD_INITIALIZER(intr_config_hook_list); 5878344Sobrienstatic struct mtx intr_config_hook_lock; 5978344SobrienMTX_SYSINIT(intr_config_hook, &intr_config_hook_lock, "intr config", MTX_DEF); 6078344Sobrien 6178344Sobrien/* ARGSUSED */ 62124618Smtmstatic void run_interrupt_driven_config_hooks(void *dummy); 63124618Smtm 64124618Smtm/* 65124618Smtm * If we wait too long for an interrupt-driven config hook to return, print 66124618Smtm * a diagnostic. 67124618Smtm */ 68124618Smtm#define WARNING_INTERVAL_SECS 60 69124618Smtmstatic void 70124618Smtmrun_interrupt_driven_config_hooks_warning(int warned) 71124618Smtm{ 72124618Smtm struct intr_config_hook *hook_entry; 73124618Smtm char namebuf[64]; 74124618Smtm long offset; 7578344Sobrien 7678344Sobrien if (warned < 6) { 7778344Sobrien printf("run_interrupt_driven_hooks: still waiting after %d " 7878344Sobrien "seconds for", warned * WARNING_INTERVAL_SECS); 79120515Smux TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) { 80120515Smux if (linker_search_symbol_name( 81124618Smtm (caddr_t)hook_entry->ich_func, namebuf, 82124618Smtm sizeof(namebuf), &offset) == 0) 83124618Smtm printf(" %s", namebuf); 84124618Smtm else 85120515Smux printf(" %p", hook_entry->ich_func); 8678344Sobrien } 8778344Sobrien printf("\n"); 8878344Sobrien } 8978344Sobrien KASSERT(warned < 6, 9078344Sobrien ("run_interrupt_driven_config_hooks: waited too long")); 9178344Sobrien} 92124618Smtm 93124618Smtmstatic void 94124618Smtmrun_interrupt_driven_config_hooks(dummy) 95124618Smtm void *dummy; 96124618Smtm{ 97124618Smtm struct intr_config_hook *hook_entry, *next_entry; 98124618Smtm int warned; 99124618Smtm 100124618Smtm mtx_lock(&intr_config_hook_lock); 101124618Smtm TAILQ_FOREACH_SAFE(hook_entry, &intr_config_hook_list, ich_links, 102124618Smtm next_entry) { 10398184Sgordon mtx_unlock(&intr_config_hook_lock); 10478344Sobrien (*hook_entry->ich_func)(hook_entry->ich_arg); 10578344Sobrien mtx_lock(&intr_config_hook_lock); 10698184Sgordon } 10798184Sgordon 108124618Smtm warned = 0; 109124928Smux while (!TAILQ_EMPTY(&intr_config_hook_list)) { 110124618Smtm if (msleep(&intr_config_hook_list, &intr_config_hook_lock, 111124618Smtm PCONFIG, "conifhk", WARNING_INTERVAL_SECS * hz) == 11298184Sgordon EWOULDBLOCK) { 11398184Sgordon mtx_unlock(&intr_config_hook_lock); 11498184Sgordon warned++; 11578344Sobrien run_interrupt_driven_config_hooks_warning(warned); 11678344Sobrien mtx_lock(&intr_config_hook_lock); 11798184Sgordon } 11878344Sobrien } 11978344Sobrien mtx_unlock(&intr_config_hook_lock); 12078344Sobrien} 121SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST, 122 run_interrupt_driven_config_hooks, NULL); 123 124/* 125 * Register a hook that will be called after "cold" 126 * autoconfiguration is complete and interrupts can 127 * be used to complete initialization. 128 */ 129int 130config_intrhook_establish(hook) 131 struct intr_config_hook *hook; 132{ 133 struct intr_config_hook *hook_entry; 134 135 mtx_lock(&intr_config_hook_lock); 136 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) 137 if (hook_entry == hook) 138 break; 139 if (hook_entry != NULL) { 140 mtx_unlock(&intr_config_hook_lock); 141 printf("config_intrhook_establish: establishing an " 142 "already established hook.\n"); 143 return (1); 144 } 145 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links); 146 mtx_unlock(&intr_config_hook_lock); 147 if (cold == 0) 148 /* XXX Sufficient for modules loaded after initial config??? */ 149 run_interrupt_driven_config_hooks(NULL); 150 return (0); 151} 152 153void 154config_intrhook_disestablish(hook) 155 struct intr_config_hook *hook; 156{ 157 struct intr_config_hook *hook_entry; 158 159 mtx_lock(&intr_config_hook_lock); 160 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) 161 if (hook_entry == hook) 162 break; 163 if (hook_entry == NULL) 164 panic("config_intrhook_disestablish: disestablishing an " 165 "unestablished hook"); 166 167 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links); 168 169 /* Wakeup anyone watching the list */ 170 wakeup(&intr_config_hook_list); 171 mtx_unlock(&intr_config_hook_lock); 172} 173 174#ifdef DDB 175#include <ddb/ddb.h> 176 177DB_SHOW_COMMAND(conifhk, db_show_conifhk) 178{ 179 struct intr_config_hook *hook_entry; 180 char namebuf[64]; 181 long offset; 182 183 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) { 184 if (linker_ddb_search_symbol_name( 185 (caddr_t)hook_entry->ich_func, namebuf, sizeof(namebuf), 186 &offset) == 0) { 187 db_printf("hook: %p at %s+%#lx arg: %p\n", 188 hook_entry->ich_func, namebuf, offset, 189 hook_entry->ich_arg); 190 } else { 191 db_printf("hook: %p at ??+?? arg %p\n", 192 hook_entry->ich_func, hook_entry->ich_arg); 193 } 194 } 195} 196#endif /* DDB */ 197