FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_autoconf.c

     /*
      * 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 $
     * $DragonFly: src/sys/kern/subr_autoconf.c,v 1.9 2007/07/28 23:24:33 dillon Exp $
     */
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/systm.h>
    #include <sys/thread.h>
    #include <sys/thread2.h>
    
    /*
     * 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 void
    run_interrupt_driven_config_hooks(void *dummy)
    {
            struct intr_config_hook *hook_entry;
            int waiting;
    
            waiting = 0;
    
            ran_config_hooks = 1;
            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;
                                    (*hook_entry->ich_func)(hook_entry->ich_arg);
                                    break;
                            }
                    }
                    if (hook_entry)
                            continue;
                    if (TAILQ_EMPTY(&intr_config_hook_list))
                            break;
    
                    if (waiting >= 20 && (waiting % 10) == 0) {
                            crit_enter();
                            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);
                            }
                            crit_exit();
                           if (waiting >= 60) {
                                   kprintf("Giving up, interrupt routing is "
                                           "probably hosed\n");
                                   break;
                           }
                   }
                   tsleep(&intr_config_hook_list, 0, "conifhk", hz);
                   ++waiting;
           }
   }
   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;
   
           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");
                   return (1);
           }
           hook->ich_ran = 0;
           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)
                   run_interrupt_driven_config_hooks(NULL);        
           return (0);
   }
   
   void
   config_intrhook_disestablish(struct intr_config_hook *hook)
   {
           struct intr_config_hook *hook_entry;
   
           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)
                   panic("config_intrhook_disestablish: disestablishing an "
                       "unestablished hook");
   
           TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
           /* Wakeup anyone watching the list */
           wakeup(&intr_config_hook_list);
   }

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