7347dfce01
The 'intr_config_hooks' SYSINIT is now taking a nontrivial amount of time in my profiling; run_interrupt_driven_config_hooks is responsible for most of it, so this adds useful information to the resulting flamecharts.
321 lines
8.8 KiB
C
321 lines
8.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)subr_autoconf.c 8.1 (Berkeley) 6/10/93
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/linker.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/systm.h>
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/*
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* Autoconfiguration subroutines.
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*/
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/*
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* "Interrupt driven config" functions.
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*/
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static STAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
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STAILQ_HEAD_INITIALIZER(intr_config_hook_list);
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static struct intr_config_hook *next_to_notify;
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static struct mtx intr_config_hook_lock;
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MTX_SYSINIT(intr_config_hook, &intr_config_hook_lock, "intr config", MTX_DEF);
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/* ARGSUSED */
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static void run_interrupt_driven_config_hooks(void);
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/*
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* Private data and a shim function for implementing config_interhook_oneshot().
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*/
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struct oneshot_config_hook {
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struct intr_config_hook
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och_hook; /* Must be first */
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ich_func_t och_func;
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void *och_arg;
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};
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static void
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config_intrhook_oneshot_func(void *arg)
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{
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struct oneshot_config_hook *ohook;
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ohook = arg;
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ohook->och_func(ohook->och_arg);
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config_intrhook_disestablish(&ohook->och_hook);
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free(ohook, M_DEVBUF);
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}
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/*
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* If we wait too long for an interrupt-driven config hook to return, print
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* a diagnostic.
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*/
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#define WARNING_INTERVAL_SECS 60
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static void
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run_interrupt_driven_config_hooks_warning(int warned)
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{
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struct intr_config_hook *hook_entry;
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char namebuf[64];
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long offset;
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if (warned < 6) {
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printf("run_interrupt_driven_hooks: still waiting after %d "
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"seconds for", warned * WARNING_INTERVAL_SECS);
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STAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
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if (linker_search_symbol_name(
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(caddr_t)hook_entry->ich_func, namebuf,
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sizeof(namebuf), &offset) == 0)
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printf(" %s", namebuf);
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else
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printf(" %p", hook_entry->ich_func);
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}
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printf("\n");
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}
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KASSERT(warned < 6,
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("run_interrupt_driven_config_hooks: waited too long"));
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}
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static void
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run_interrupt_driven_config_hooks()
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{
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static int running;
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struct intr_config_hook *hook_entry;
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TSENTER();
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mtx_lock(&intr_config_hook_lock);
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/*
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* If hook processing is already active, any newly
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* registered hooks will eventually be notified.
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* Let the currently running session issue these
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* notifications.
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*/
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if (running != 0) {
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mtx_unlock(&intr_config_hook_lock);
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return;
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}
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running = 1;
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while (next_to_notify != NULL) {
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hook_entry = next_to_notify;
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next_to_notify = STAILQ_NEXT(hook_entry, ich_links);
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hook_entry->ich_state = ICHS_RUNNING;
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mtx_unlock(&intr_config_hook_lock);
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(*hook_entry->ich_func)(hook_entry->ich_arg);
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mtx_lock(&intr_config_hook_lock);
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}
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running = 0;
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mtx_unlock(&intr_config_hook_lock);
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TSEXIT();
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}
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static void
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boot_run_interrupt_driven_config_hooks(void *dummy)
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{
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int warned;
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run_interrupt_driven_config_hooks();
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/* Block boot processing until all hooks are disestablished. */
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TSWAIT("config hooks");
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mtx_lock(&intr_config_hook_lock);
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warned = 0;
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while (!STAILQ_EMPTY(&intr_config_hook_list)) {
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if (msleep(&intr_config_hook_list, &intr_config_hook_lock,
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0, "conifhk", WARNING_INTERVAL_SECS * hz) ==
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EWOULDBLOCK) {
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mtx_unlock(&intr_config_hook_lock);
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warned++;
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run_interrupt_driven_config_hooks_warning(warned);
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mtx_lock(&intr_config_hook_lock);
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}
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}
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mtx_unlock(&intr_config_hook_lock);
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TSUNWAIT("config hooks");
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}
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SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
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boot_run_interrupt_driven_config_hooks, NULL);
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/*
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* Register a hook that will be called after "cold"
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* autoconfiguration is complete and interrupts can
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* be used to complete initialization.
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*/
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int
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config_intrhook_establish(struct intr_config_hook *hook)
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{
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struct intr_config_hook *hook_entry;
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TSHOLD("config hooks");
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mtx_lock(&intr_config_hook_lock);
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STAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links)
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if (hook_entry == hook)
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break;
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if (hook_entry != NULL) {
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mtx_unlock(&intr_config_hook_lock);
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printf("config_intrhook_establish: establishing an "
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"already established hook.\n");
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return (1);
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}
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STAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
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if (next_to_notify == NULL)
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next_to_notify = hook;
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hook->ich_state = ICHS_QUEUED;
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mtx_unlock(&intr_config_hook_lock);
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if (cold == 0)
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/*
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* XXX Call from a task since not all drivers expect
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* to be re-entered at the time a hook is established.
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*/
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/* XXX Sufficient for modules loaded after initial config??? */
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run_interrupt_driven_config_hooks();
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return (0);
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}
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/*
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* Register a hook function that is automatically unregistered after it runs.
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*/
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void
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config_intrhook_oneshot(ich_func_t func, void *arg)
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{
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struct oneshot_config_hook *ohook;
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ohook = malloc(sizeof(*ohook), M_DEVBUF, M_WAITOK);
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ohook->och_func = func;
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ohook->och_arg = arg;
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ohook->och_hook.ich_func = config_intrhook_oneshot_func;
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ohook->och_hook.ich_arg = ohook;
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config_intrhook_establish(&ohook->och_hook);
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}
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static void
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config_intrhook_disestablish_locked(struct intr_config_hook *hook)
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{
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struct intr_config_hook *hook_entry;
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STAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links)
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if (hook_entry == hook)
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break;
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if (hook_entry == NULL)
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panic("config_intrhook_disestablish: disestablishing an "
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"unestablished hook");
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if (next_to_notify == hook)
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next_to_notify = STAILQ_NEXT(hook, ich_links);
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STAILQ_REMOVE(&intr_config_hook_list, hook, intr_config_hook, ich_links);
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TSRELEASE("config hooks");
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/* Wakeup anyone watching the list */
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hook->ich_state = ICHS_DONE;
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wakeup(&intr_config_hook_list);
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}
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void
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config_intrhook_disestablish(struct intr_config_hook *hook)
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{
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mtx_lock(&intr_config_hook_lock);
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config_intrhook_disestablish_locked(hook);
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mtx_unlock(&intr_config_hook_lock);
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}
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int
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config_intrhook_drain(struct intr_config_hook *hook)
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{
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mtx_lock(&intr_config_hook_lock);
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/*
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* The config hook has completed, so just return.
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*/
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if (hook->ich_state == ICHS_DONE) {
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mtx_unlock(&intr_config_hook_lock);
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return (ICHS_DONE);
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}
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/*
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* The config hook hasn't started running, just call disestablish.
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*/
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if (hook->ich_state == ICHS_QUEUED) {
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config_intrhook_disestablish_locked(hook);
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mtx_unlock(&intr_config_hook_lock);
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return (ICHS_QUEUED);
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}
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/*
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* The config hook is running, so wait for it to complete and return.
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*/
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while (hook->ich_state != ICHS_DONE) {
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if (msleep(&intr_config_hook_list, &intr_config_hook_lock,
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0, "confhd", hz) == EWOULDBLOCK) {
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// XXX do I whine?
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}
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}
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mtx_unlock(&intr_config_hook_lock);
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return (ICHS_RUNNING);
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}
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#ifdef DDB
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#include <ddb/ddb.h>
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DB_SHOW_COMMAND(conifhk, db_show_conifhk)
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{
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struct intr_config_hook *hook_entry;
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char namebuf[64];
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long offset;
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STAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
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if (linker_ddb_search_symbol_name(
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(caddr_t)hook_entry->ich_func, namebuf, sizeof(namebuf),
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&offset) == 0) {
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db_printf("hook: %p at %s+%#lx arg: %p\n",
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hook_entry->ich_func, namebuf, offset,
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hook_entry->ich_arg);
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} else {
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db_printf("hook: %p at ??+?? arg %p\n",
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hook_entry->ich_func, hook_entry->ich_arg);
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}
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}
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}
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#endif /* DDB */
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