/* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Lawrence Berkeley Laboratories. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)subr_autoconf.c 8.1 (Berkeley) 6/10/93 * * $FreeBSD: src/sys/kern/subr_autoconf.c,v 1.14 1999/10/05 21:19:41 n_hibma Exp $ */ #include #include #include #include /* * Autoconfiguration subroutines. */ /* * "Interrupt driven config" functions. */ static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list = TAILQ_HEAD_INITIALIZER(intr_config_hook_list); /* ARGSUSED */ static void run_interrupt_driven_config_hooks (void *dummy); static int ran_config_hooks; static struct lock intr_config_lk = LOCK_INITIALIZER("intrcfg", 0, 0); static void run_interrupt_driven_config_hooks(void *dummy) { struct intr_config_hook *hook_entry; int save_ticks = ticks; int save_count; int waiting; lockmgr(&intr_config_lk, LK_EXCLUSIVE); save_count = ran_config_hooks++; while (!TAILQ_EMPTY(&intr_config_hook_list)) { TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) { if (hook_entry->ich_ran == 0) { hook_entry->ich_ran = 1; lockmgr(&intr_config_lk, LK_RELEASE); (*hook_entry->ich_func)(hook_entry->ich_arg); lockmgr(&intr_config_lk, LK_EXCLUSIVE); break; } } if (hook_entry) continue; if (TAILQ_EMPTY(&intr_config_hook_list)) break; waiting = (ticks - save_ticks + 1) / hz; if (waiting >= 10 && (waiting % 10) == 0) { kprintf("**WARNING** waiting for the following device " "to finish configuring:\n"); TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) { kprintf(" %s:\tfunc=%p arg=%p\n", (hook_entry->ich_desc ? hook_entry->ich_desc : "?"), hook_entry->ich_func, hook_entry->ich_arg); } if (save_count || waiting >= 30) { kprintf("Giving up, interrupt routing is " "probably hosed\n"); break; } } lksleep(&intr_config_hook_list, &intr_config_lk, 0, "conifhk", hz); ++waiting; } lockmgr(&intr_config_lk, LK_RELEASE); /* * Terrible hack to give U4B (usb) a chance to configure, else * the root mount might not see a valid usb device. This can happen * because the AHCI devices might have already finished probing * before the usb ports are even registered. */ #ifndef _KERNEL_VIRTUAL if (save_count == 0) { while (ticks - save_ticks < 5*hz) tsleep(&intr_config_hook_list, 0, "delay", hz / 10); } #endif } SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST, run_interrupt_driven_config_hooks, NULL); /* * Register a hook that will be called after "cold" * autoconfiguration is complete and interrupts can * be used to complete initialization. */ int config_intrhook_establish(struct intr_config_hook *hook) { struct intr_config_hook *hook_entry; lockmgr(&intr_config_lk, LK_EXCLUSIVE); for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); hook_entry != NULL; hook_entry = TAILQ_NEXT(hook_entry, ich_links)) { if (hook_entry == hook) break; if (hook_entry->ich_order > hook->ich_order) break; } if (hook_entry == hook) { kprintf("config_intrhook_establish: establishing an " "already established hook.\n"); lockmgr(&intr_config_lk, LK_RELEASE); return (1); } hook->ich_ran = 0; /* * Insert */ if (hook_entry) TAILQ_INSERT_BEFORE(hook_entry, hook, ich_links); else TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links); /* * Late hook, run immediately. */ if (ran_config_hooks) { lockmgr(&intr_config_lk, LK_RELEASE); run_interrupt_driven_config_hooks(NULL); lockmgr(&intr_config_lk, LK_EXCLUSIVE); } lockmgr(&intr_config_lk, LK_RELEASE); return (0); } void config_intrhook_disestablish(struct intr_config_hook *hook) { struct intr_config_hook *hook_entry; lockmgr(&intr_config_lk, LK_EXCLUSIVE); for (hook_entry = TAILQ_FIRST(&intr_config_hook_list); hook_entry != NULL; hook_entry = TAILQ_NEXT(hook_entry, ich_links)) { if (hook_entry == hook) break; } if (hook_entry == NULL) { lockmgr(&intr_config_lk, LK_RELEASE); panic("config_intrhook_disestablish: disestablishing an " "unestablished hook (%p)", hook); } TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links); /* Wakeup anyone watching the list */ wakeup(&intr_config_hook_list); lockmgr(&intr_config_lk, LK_RELEASE); }