2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
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.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
33 * @(#)subr_autoconf.c 8.1 (Berkeley) 6/10/93
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
42 #include <sys/param.h>
43 #include <sys/kernel.h>
44 #include <sys/linker.h>
46 #include <sys/malloc.h>
47 #include <sys/mutex.h>
48 #include <sys/systm.h>
51 * Autoconfiguration subroutines.
55 * "Interrupt driven config" functions.
57 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
58 TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
59 static struct intr_config_hook *next_to_notify;
60 static struct mtx intr_config_hook_lock;
61 MTX_SYSINIT(intr_config_hook, &intr_config_hook_lock, "intr config", MTX_DEF);
64 static void run_interrupt_driven_config_hooks(void);
67 * Private data and a shim function for implementing config_interhook_oneshot().
69 struct oneshot_config_hook {
70 struct intr_config_hook
71 och_hook; /* Must be first */
77 config_intrhook_oneshot_func(void *arg)
79 struct oneshot_config_hook *ohook;
82 ohook->och_func(ohook->och_arg);
83 config_intrhook_disestablish(&ohook->och_hook);
84 free(ohook, M_DEVBUF);
88 * If we wait too long for an interrupt-driven config hook to return, print
91 #define WARNING_INTERVAL_SECS 60
93 run_interrupt_driven_config_hooks_warning(int warned)
95 struct intr_config_hook *hook_entry;
100 printf("run_interrupt_driven_hooks: still waiting after %d "
101 "seconds for", warned * WARNING_INTERVAL_SECS);
102 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
103 if (linker_search_symbol_name(
104 (caddr_t)hook_entry->ich_func, namebuf,
105 sizeof(namebuf), &offset) == 0)
106 printf(" %s", namebuf);
108 printf(" %p", hook_entry->ich_func);
113 ("run_interrupt_driven_config_hooks: waited too long"));
117 run_interrupt_driven_config_hooks()
120 struct intr_config_hook *hook_entry;
122 mtx_lock(&intr_config_hook_lock);
125 * If hook processing is already active, any newly
126 * registered hooks will eventually be notified.
127 * Let the currently running session issue these
131 mtx_unlock(&intr_config_hook_lock);
136 while (next_to_notify != NULL) {
137 hook_entry = next_to_notify;
138 next_to_notify = TAILQ_NEXT(hook_entry, ich_links);
139 mtx_unlock(&intr_config_hook_lock);
140 (*hook_entry->ich_func)(hook_entry->ich_arg);
141 mtx_lock(&intr_config_hook_lock);
145 mtx_unlock(&intr_config_hook_lock);
149 boot_run_interrupt_driven_config_hooks(void *dummy)
153 run_interrupt_driven_config_hooks();
155 /* Block boot processing until all hooks are disestablished. */
156 mtx_lock(&intr_config_hook_lock);
158 while (!TAILQ_EMPTY(&intr_config_hook_list)) {
159 if (msleep(&intr_config_hook_list, &intr_config_hook_lock,
160 0, "conifhk", WARNING_INTERVAL_SECS * hz) ==
162 mtx_unlock(&intr_config_hook_lock);
164 run_interrupt_driven_config_hooks_warning(warned);
165 mtx_lock(&intr_config_hook_lock);
168 mtx_unlock(&intr_config_hook_lock);
171 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
172 boot_run_interrupt_driven_config_hooks, NULL);
175 * Register a hook that will be called after "cold"
176 * autoconfiguration is complete and interrupts can
177 * be used to complete initialization.
180 config_intrhook_establish(struct intr_config_hook *hook)
182 struct intr_config_hook *hook_entry;
184 mtx_lock(&intr_config_hook_lock);
185 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links)
186 if (hook_entry == hook)
188 if (hook_entry != NULL) {
189 mtx_unlock(&intr_config_hook_lock);
190 printf("config_intrhook_establish: establishing an "
191 "already established hook.\n");
194 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
195 if (next_to_notify == NULL)
196 next_to_notify = hook;
197 mtx_unlock(&intr_config_hook_lock);
200 * XXX Call from a task since not all drivers expect
201 * to be re-entered at the time a hook is established.
203 /* XXX Sufficient for modules loaded after initial config??? */
204 run_interrupt_driven_config_hooks();
209 * Register a hook function that is automatically unregistered after it runs.
212 config_intrhook_oneshot(ich_func_t func, void *arg)
214 struct oneshot_config_hook *ohook;
216 ohook = malloc(sizeof(*ohook), M_DEVBUF, M_WAITOK);
217 ohook->och_func = func;
218 ohook->och_arg = arg;
219 ohook->och_hook.ich_func = config_intrhook_oneshot_func;
220 ohook->och_hook.ich_arg = ohook;
221 config_intrhook_establish(&ohook->och_hook);
225 config_intrhook_disestablish(struct intr_config_hook *hook)
227 struct intr_config_hook *hook_entry;
229 mtx_lock(&intr_config_hook_lock);
230 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links)
231 if (hook_entry == hook)
233 if (hook_entry == NULL)
234 panic("config_intrhook_disestablish: disestablishing an "
235 "unestablished hook");
237 if (next_to_notify == hook)
238 next_to_notify = TAILQ_NEXT(hook, ich_links);
239 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
241 /* Wakeup anyone watching the list */
242 wakeup(&intr_config_hook_list);
243 mtx_unlock(&intr_config_hook_lock);
249 DB_SHOW_COMMAND(conifhk, db_show_conifhk)
251 struct intr_config_hook *hook_entry;
255 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
256 if (linker_ddb_search_symbol_name(
257 (caddr_t)hook_entry->ich_func, namebuf, sizeof(namebuf),
259 db_printf("hook: %p at %s+%#lx arg: %p\n",
260 hook_entry->ich_func, namebuf, offset,
261 hook_entry->ich_arg);
263 db_printf("hook: %p at ??+?? arg %p\n",
264 hook_entry->ich_func, hook_entry->ich_arg);