bc5a4a665d31ec8075b44d53c6ed612e551d09b8
[dragonfly.git] / sys / kern / subr_autoconf.c
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  * All advertising materials mentioning features or use of this software
10  * must display the following acknowledgement:
11  *      This product includes software developed by the University of
12  *      California, Lawrence Berkeley Laboratories.
13  *
14  * Redistribution and use in source and binary forms, with or without
15  * modification, are permitted provided that the following conditions
16  * are met:
17  * 1. Redistributions of source code must retain the above copyright
18  *    notice, this list of conditions and the following disclaimer.
19  * 2. Redistributions in binary form must reproduce the above copyright
20  *    notice, this list of conditions and the following disclaimer in the
21  *    documentation and/or other materials provided with the distribution.
22  * 3. All advertising materials mentioning features or use of this software
23  *    must display the following acknowledgement:
24  *      This product includes software developed by the University of
25  *      California, Berkeley and its contributors.
26  * 4. Neither the name of the University nor the names of its contributors
27  *    may be used to endorse or promote products derived from this software
28  *    without specific prior written permission.
29  *
30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40  * SUCH DAMAGE.
41  *
42  *      @(#)subr_autoconf.c     8.1 (Berkeley) 6/10/93
43  *
44  * $FreeBSD: src/sys/kern/subr_autoconf.c,v 1.14 1999/10/05 21:19:41 n_hibma Exp $
45  * $DragonFly: src/sys/kern/subr_autoconf.c,v 1.9 2007/07/28 23:24:33 dillon Exp $
46  */
47
48 #include <sys/param.h>
49 #include <sys/kernel.h>
50 #include <sys/systm.h>
51 #include <sys/thread.h>
52 #include <sys/thread2.h>
53
54 /*
55  * Autoconfiguration subroutines.
56  */
57
58 /*
59  * "Interrupt driven config" functions.
60  */
61 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
62         TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
63
64
65 /* ARGSUSED */
66 static void run_interrupt_driven_config_hooks (void *dummy);
67
68 static void
69 run_interrupt_driven_config_hooks(void *dummy)
70 {
71         struct intr_config_hook *hook_entry, *next_entry;
72         int waiting;
73
74         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
75              hook_entry != NULL;
76              hook_entry = next_entry) {
77                 next_entry = TAILQ_NEXT(hook_entry, ich_links);
78                 (*hook_entry->ich_func)(hook_entry->ich_arg);
79         }
80
81         waiting = 0;
82         while (!TAILQ_EMPTY(&intr_config_hook_list)) {
83                 if (waiting >= 20) {
84                         crit_enter();
85                         kprintf("**WARNING** waiting for the following device to finish configuring:\n");
86                         TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
87                             kprintf("  %s:\tfunc=%p arg=%p\n",
88                                 (hook_entry->ich_desc ?
89                                     hook_entry->ich_desc : "?"),
90                                 hook_entry->ich_func,
91                                 hook_entry->ich_arg);
92                         }
93                         crit_exit();
94                         if (waiting >= 60) {
95                                 kprintf("Giving up, interrupt routing is probably hosed\n");
96                                 break;
97                         }
98                 }
99                 tsleep(&intr_config_hook_list, 0, "conifhk", hz * 10);
100                 waiting += 10;
101         }
102 }
103 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
104         run_interrupt_driven_config_hooks, NULL)
105
106 /*
107  * Register a hook that will be called after "cold"
108  * autoconfiguration is complete and interrupts can
109  * be used to complete initialization.
110  */
111 int
112 config_intrhook_establish(struct intr_config_hook *hook)
113 {
114         struct intr_config_hook *hook_entry;
115
116         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
117              hook_entry != NULL;
118              hook_entry = TAILQ_NEXT(hook_entry, ich_links)) {
119                 if (hook_entry == hook)
120                         break;
121                 if (hook_entry->ich_order > hook->ich_order)
122                         break;
123         }
124         if (hook_entry == hook) {
125                 kprintf("config_intrhook_establish: establishing an "
126                        "already established hook.\n");
127                 return (1);
128         }
129         if (hook_entry)
130                 TAILQ_INSERT_BEFORE(hook_entry, hook, ich_links);
131         else
132                 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
133         if (cold == 0)
134                 /* XXX Sufficient for modules loaded after initial config??? */
135                 run_interrupt_driven_config_hooks(NULL);        
136         return (0);
137 }
138
139 void
140 config_intrhook_disestablish(struct intr_config_hook *hook)
141 {
142         struct intr_config_hook *hook_entry;
143
144         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
145              hook_entry != NULL;
146              hook_entry = TAILQ_NEXT(hook_entry, ich_links))
147                 if (hook_entry == hook)
148                         break;
149         if (hook_entry == NULL)
150                 panic("config_intrhook_disestablish: disestablishing an "
151                     "unestablished hook");
152
153         TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
154         /* Wakeup anyone watching the list */
155         wakeup(&intr_config_hook_list);
156 }