2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * @(#)subr_autoconf.c 8.1 (Berkeley) 6/10/93
39 #include <sys/cdefs.h>
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(void)
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 hook_entry->ich_state = ICHS_RUNNING;
140 mtx_unlock(&intr_config_hook_lock);
141 (*hook_entry->ich_func)(hook_entry->ich_arg);
142 mtx_lock(&intr_config_hook_lock);
146 mtx_unlock(&intr_config_hook_lock);
150 boot_run_interrupt_driven_config_hooks(void *dummy)
154 run_interrupt_driven_config_hooks();
156 /* Block boot processing until all hooks are disestablished. */
157 TSWAIT("config hooks");
158 mtx_lock(&intr_config_hook_lock);
160 while (!TAILQ_EMPTY(&intr_config_hook_list)) {
161 if (msleep(&intr_config_hook_list, &intr_config_hook_lock,
162 0, "conifhk", WARNING_INTERVAL_SECS * hz) ==
164 mtx_unlock(&intr_config_hook_lock);
166 run_interrupt_driven_config_hooks_warning(warned);
167 mtx_lock(&intr_config_hook_lock);
170 mtx_unlock(&intr_config_hook_lock);
171 TSUNWAIT("config hooks");
174 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
175 boot_run_interrupt_driven_config_hooks, NULL);
178 * Register a hook that will be called after "cold"
179 * autoconfiguration is complete and interrupts can
180 * be used to complete initialization.
183 config_intrhook_establish(struct intr_config_hook *hook)
185 struct intr_config_hook *hook_entry;
187 TSHOLD("config hooks");
188 mtx_lock(&intr_config_hook_lock);
189 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links)
190 if (hook_entry == hook)
192 if (hook_entry != NULL) {
193 mtx_unlock(&intr_config_hook_lock);
194 printf("config_intrhook_establish: establishing an "
195 "already established hook.\n");
198 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
199 if (next_to_notify == NULL)
200 next_to_notify = hook;
201 hook->ich_state = ICHS_QUEUED;
202 mtx_unlock(&intr_config_hook_lock);
205 * XXX Call from a task since not all drivers expect
206 * to be re-entered at the time a hook is established.
208 /* XXX Sufficient for modules loaded after initial config??? */
209 run_interrupt_driven_config_hooks();
214 * Register a hook function that is automatically unregistered after it runs.
217 config_intrhook_oneshot(ich_func_t func, void *arg)
219 struct oneshot_config_hook *ohook;
221 ohook = malloc(sizeof(*ohook), M_DEVBUF, M_WAITOK);
222 ohook->och_func = func;
223 ohook->och_arg = arg;
224 ohook->och_hook.ich_func = config_intrhook_oneshot_func;
225 ohook->och_hook.ich_arg = ohook;
226 config_intrhook_establish(&ohook->och_hook);
230 config_intrhook_disestablish_locked(struct intr_config_hook *hook)
232 struct intr_config_hook *hook_entry;
234 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links)
235 if (hook_entry == hook)
237 if (hook_entry == NULL)
238 panic("config_intrhook_disestablish: disestablishing an "
239 "unestablished hook");
241 if (next_to_notify == hook)
242 next_to_notify = TAILQ_NEXT(hook, ich_links);
243 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
244 TSRELEASE("config hooks");
246 /* Wakeup anyone watching the list */
247 hook->ich_state = ICHS_DONE;
248 wakeup(&intr_config_hook_list);
252 config_intrhook_disestablish(struct intr_config_hook *hook)
254 mtx_lock(&intr_config_hook_lock);
255 config_intrhook_disestablish_locked(hook);
256 mtx_unlock(&intr_config_hook_lock);
260 config_intrhook_drain(struct intr_config_hook *hook)
262 mtx_lock(&intr_config_hook_lock);
265 * The config hook has completed, so just return.
267 if (hook->ich_state == ICHS_DONE) {
268 mtx_unlock(&intr_config_hook_lock);
273 * The config hook hasn't started running, just call disestablish.
275 if (hook->ich_state == ICHS_QUEUED) {
276 config_intrhook_disestablish_locked(hook);
277 mtx_unlock(&intr_config_hook_lock);
278 return (ICHS_QUEUED);
282 * The config hook is running, so wait for it to complete and return.
284 while (hook->ich_state != ICHS_DONE) {
285 if (msleep(&intr_config_hook_list, &intr_config_hook_lock,
286 0, "confhd", hz) == EWOULDBLOCK) {
290 mtx_unlock(&intr_config_hook_lock);
291 return (ICHS_RUNNING);
297 DB_SHOW_COMMAND(conifhk, db_show_conifhk)
299 struct intr_config_hook *hook_entry;
303 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
304 if (linker_ddb_search_symbol_name(
305 (caddr_t)hook_entry->ich_func, namebuf, sizeof(namebuf),
307 db_printf("hook: %p at %s+%#lx arg: %p\n",
308 hook_entry->ich_func, namebuf, offset,
309 hook_entry->ich_arg);
311 db_printf("hook: %p at ??+?? arg %p\n",
312 hook_entry->ich_func, hook_entry->ich_arg);