The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    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: releng/10.1/sys/kern/subr_autoconf.c 217075 2011-01-06 22:09:37Z jhb $");
   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 intr_config_hook *next_to_notify;
   59 static struct mtx intr_config_hook_lock;
   60 MTX_SYSINIT(intr_config_hook, &intr_config_hook_lock, "intr config", MTX_DEF);
   61 
   62 /* ARGSUSED */
   63 static void run_interrupt_driven_config_hooks(void);
   64 
   65 /*
   66  * If we wait too long for an interrupt-driven config hook to return, print
   67  * a diagnostic.
   68  */
   69 #define WARNING_INTERVAL_SECS   60
   70 static void
   71 run_interrupt_driven_config_hooks_warning(int warned)
   72 {
   73         struct intr_config_hook *hook_entry;
   74         char namebuf[64];
   75         long offset;
   76 
   77         if (warned < 6) {
   78                 printf("run_interrupt_driven_hooks: still waiting after %d "
   79                     "seconds for", warned * WARNING_INTERVAL_SECS);
   80                 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
   81                         if (linker_search_symbol_name(
   82                             (caddr_t)hook_entry->ich_func, namebuf,
   83                             sizeof(namebuf), &offset) == 0)
   84                                 printf(" %s", namebuf);
   85                         else
   86                                 printf(" %p", hook_entry->ich_func);
   87                 }
   88                 printf("\n");
   89         }
   90         KASSERT(warned < 6,
   91             ("run_interrupt_driven_config_hooks: waited too long"));
   92 }
   93 
   94 static void
   95 run_interrupt_driven_config_hooks()
   96 {
   97         static int running;
   98         struct intr_config_hook *hook_entry;
   99 
  100         mtx_lock(&intr_config_hook_lock);
  101 
  102         /*
  103          * If hook processing is already active, any newly
  104          * registered hooks will eventually be notified.
  105          * Let the currently running session issue these
  106          * notifications.
  107          */
  108         if (running != 0) {
  109                 mtx_unlock(&intr_config_hook_lock);
  110                 return;
  111         }
  112         running = 1;
  113 
  114         while (next_to_notify != NULL) {
  115                 hook_entry = next_to_notify;
  116                 next_to_notify = TAILQ_NEXT(hook_entry, ich_links);
  117                 mtx_unlock(&intr_config_hook_lock);
  118                 (*hook_entry->ich_func)(hook_entry->ich_arg);
  119                 mtx_lock(&intr_config_hook_lock);
  120         }
  121 
  122         running = 0;
  123         mtx_unlock(&intr_config_hook_lock);
  124 }
  125 
  126 static void
  127 boot_run_interrupt_driven_config_hooks(void *dummy)
  128 {
  129         int warned;
  130 
  131         run_interrupt_driven_config_hooks();
  132 
  133         /* Block boot processing until all hooks are disestablished. */
  134         mtx_lock(&intr_config_hook_lock);
  135         warned = 0;
  136         while (!TAILQ_EMPTY(&intr_config_hook_list)) {
  137                 if (msleep(&intr_config_hook_list, &intr_config_hook_lock,
  138                     0, "conifhk", WARNING_INTERVAL_SECS * hz) ==
  139                     EWOULDBLOCK) {
  140                         mtx_unlock(&intr_config_hook_lock);
  141                         warned++;
  142                         run_interrupt_driven_config_hooks_warning(warned);
  143                         mtx_lock(&intr_config_hook_lock);
  144                 }
  145         }
  146         mtx_unlock(&intr_config_hook_lock);
  147 }
  148 
  149 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
  150         boot_run_interrupt_driven_config_hooks, NULL);
  151 
  152 /*
  153  * Register a hook that will be called after "cold"
  154  * autoconfiguration is complete and interrupts can
  155  * be used to complete initialization.
  156  */
  157 int
  158 config_intrhook_establish(struct intr_config_hook *hook)
  159 {
  160         struct intr_config_hook *hook_entry;
  161 
  162         mtx_lock(&intr_config_hook_lock);
  163         TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links)
  164                 if (hook_entry == hook)
  165                         break;
  166         if (hook_entry != NULL) {
  167                 mtx_unlock(&intr_config_hook_lock);
  168                 printf("config_intrhook_establish: establishing an "
  169                        "already established hook.\n");
  170                 return (1);
  171         }
  172         TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
  173         if (next_to_notify == NULL)
  174                 next_to_notify = hook;
  175         mtx_unlock(&intr_config_hook_lock);
  176         if (cold == 0)
  177                 /*
  178                  * XXX Call from a task since not all drivers expect
  179                  *     to be re-entered at the time a hook is established.
  180                  */
  181                 /* XXX Sufficient for modules loaded after initial config??? */
  182                 run_interrupt_driven_config_hooks();    
  183         return (0);
  184 }
  185 
  186 void
  187 config_intrhook_disestablish(struct intr_config_hook *hook)
  188 {
  189         struct intr_config_hook *hook_entry;
  190 
  191         mtx_lock(&intr_config_hook_lock);
  192         TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links)
  193                 if (hook_entry == hook)
  194                         break;
  195         if (hook_entry == NULL)
  196                 panic("config_intrhook_disestablish: disestablishing an "
  197                       "unestablished hook");
  198 
  199         if (next_to_notify == hook)
  200                 next_to_notify = TAILQ_NEXT(hook, ich_links);
  201         TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
  202 
  203         /* Wakeup anyone watching the list */
  204         wakeup(&intr_config_hook_list);
  205         mtx_unlock(&intr_config_hook_lock);
  206 }
  207 
  208 #ifdef DDB
  209 #include <ddb/ddb.h>
  210 
  211 DB_SHOW_COMMAND(conifhk, db_show_conifhk)
  212 {
  213         struct intr_config_hook *hook_entry;
  214         char namebuf[64];
  215         long offset;
  216 
  217         TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
  218                 if (linker_ddb_search_symbol_name(
  219                     (caddr_t)hook_entry->ich_func, namebuf, sizeof(namebuf),
  220                     &offset) == 0) {
  221                         db_printf("hook: %p at %s+%#lx arg: %p\n",
  222                             hook_entry->ich_func, namebuf, offset,
  223                             hook_entry->ich_arg);
  224                 } else {
  225                         db_printf("hook: %p at ??+?? arg %p\n",
  226                             hook_entry->ich_func, hook_entry->ich_arg);
  227                 }
  228         }
  229 }
  230 #endif /* DDB */

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