64dd590ece
This is to prevent caching of its value in a register when it is checked and modified by multiple CPUs in parallel. Also, move the variable into the scope of the only function that uses it. Reviewed by: jhb Hint from: mdf MFC after: 1 week
718 lines
18 KiB
C
718 lines
18 KiB
C
/*-
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* Copyright (c) 1986, 1988, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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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* 4. 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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* @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
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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 "opt_kdb.h"
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#include "opt_panic.h"
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#include "opt_show_busybufs.h"
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#include "opt_sched.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/cons.h>
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#include <sys/eventhandler.h>
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#include <sys/jail.h>
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#include <sys/kdb.h>
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#include <sys/kernel.h>
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#include <sys/kerneldump.h>
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#include <sys/kthread.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/reboot.h>
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#include <sys/resourcevar.h>
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#include <sys/sched.h>
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#include <sys/smp.h>
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#include <sys/sysctl.h>
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#include <sys/sysproto.h>
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#include <ddb/ddb.h>
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#include <machine/cpu.h>
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#include <machine/pcb.h>
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#include <machine/smp.h>
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#include <security/mac/mac_framework.h>
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#include <vm/vm.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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#include <vm/swap_pager.h>
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#include <sys/signalvar.h>
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#ifndef PANIC_REBOOT_WAIT_TIME
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#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
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#endif
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/*
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* Note that stdarg.h and the ANSI style va_start macro is used for both
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* ANSI and traditional C compilers.
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*/
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#include <machine/stdarg.h>
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#ifdef KDB
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#ifdef KDB_UNATTENDED
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int debugger_on_panic = 0;
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#else
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int debugger_on_panic = 1;
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#endif
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SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
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&debugger_on_panic, 0, "Run debugger on kernel panic");
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TUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic);
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#ifdef KDB_TRACE
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static int trace_on_panic = 1;
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#else
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static int trace_on_panic = 0;
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#endif
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SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
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&trace_on_panic, 0, "Print stack trace on kernel panic");
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TUNABLE_INT("debug.trace_on_panic", &trace_on_panic);
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#endif /* KDB */
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static int sync_on_panic = 0;
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SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
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&sync_on_panic, 0, "Do a sync before rebooting from a panic");
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TUNABLE_INT("kern.sync_on_panic", &sync_on_panic);
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SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
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/*
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* Variable panicstr contains argument to first call to panic; used as flag
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* to indicate that the kernel has already called panic.
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*/
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const char *panicstr;
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int dumping; /* system is dumping */
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int rebooting; /* system is rebooting */
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static struct dumperinfo dumper; /* our selected dumper */
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/* Context information for dump-debuggers. */
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static struct pcb dumppcb; /* Registers. */
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static lwpid_t dumptid; /* Thread ID. */
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static void boot(int) __dead2;
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static void poweroff_wait(void *, int);
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static void shutdown_halt(void *junk, int howto);
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static void shutdown_panic(void *junk, int howto);
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static void shutdown_reset(void *junk, int howto);
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/* register various local shutdown events */
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static void
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shutdown_conf(void *unused)
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{
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EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
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SHUTDOWN_PRI_FIRST + 100);
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EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
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SHUTDOWN_PRI_LAST + 100);
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EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
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SHUTDOWN_PRI_LAST + 100);
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EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
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SHUTDOWN_PRI_LAST + 200);
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}
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SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
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/*
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* The system call that results in a reboot.
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*/
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/* ARGSUSED */
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int
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reboot(struct thread *td, struct reboot_args *uap)
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{
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int error;
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error = 0;
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#ifdef MAC
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error = mac_system_check_reboot(td->td_ucred, uap->opt);
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#endif
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if (error == 0)
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error = priv_check(td, PRIV_REBOOT);
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if (error == 0) {
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mtx_lock(&Giant);
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boot(uap->opt);
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mtx_unlock(&Giant);
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}
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return (error);
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}
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/*
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* Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
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*/
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static int shutdown_howto = 0;
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void
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shutdown_nice(int howto)
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{
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shutdown_howto = howto;
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/* Send a signal to init(8) and have it shutdown the world */
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if (initproc != NULL) {
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PROC_LOCK(initproc);
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psignal(initproc, SIGINT);
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PROC_UNLOCK(initproc);
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} else {
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/* No init(8) running, so simply reboot */
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boot(RB_NOSYNC);
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}
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return;
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}
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static int waittime = -1;
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static void
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print_uptime(void)
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{
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int f;
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struct timespec ts;
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getnanouptime(&ts);
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printf("Uptime: ");
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f = 0;
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if (ts.tv_sec >= 86400) {
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printf("%ldd", (long)ts.tv_sec / 86400);
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ts.tv_sec %= 86400;
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f = 1;
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}
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if (f || ts.tv_sec >= 3600) {
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printf("%ldh", (long)ts.tv_sec / 3600);
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ts.tv_sec %= 3600;
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f = 1;
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}
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if (f || ts.tv_sec >= 60) {
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printf("%ldm", (long)ts.tv_sec / 60);
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ts.tv_sec %= 60;
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f = 1;
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}
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printf("%lds\n", (long)ts.tv_sec);
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}
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static void
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doadump(void)
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{
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/*
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* Sometimes people have to call this from the kernel debugger.
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* (if 'panic' can not dump)
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* Give them a clue as to why they can't dump.
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*/
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if (dumper.dumper == NULL) {
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printf("Cannot dump. Device not defined or unavailable.\n");
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return;
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}
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savectx(&dumppcb);
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dumptid = curthread->td_tid;
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dumping++;
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#ifdef DDB
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if (textdump_pending)
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textdump_dumpsys(&dumper);
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else
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#endif
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dumpsys(&dumper);
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dumping--;
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}
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static int
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isbufbusy(struct buf *bp)
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{
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if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
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BUF_ISLOCKED(bp)) ||
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((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
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return (1);
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return (0);
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}
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/*
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* Shutdown the system cleanly to prepare for reboot, halt, or power off.
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*/
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static void
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boot(int howto)
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{
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static int first_buf_printf = 1;
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#if defined(SMP)
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/*
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* Bind us to CPU 0 so that all shutdown code runs there. Some
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* systems don't shutdown properly (i.e., ACPI power off) if we
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* run on another processor.
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*/
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thread_lock(curthread);
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sched_bind(curthread, 0);
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thread_unlock(curthread);
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KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
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#endif
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/* We're in the process of rebooting. */
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rebooting = 1;
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/* collect extra flags that shutdown_nice might have set */
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howto |= shutdown_howto;
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/* We are out of the debugger now. */
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kdb_active = 0;
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/*
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* Do any callouts that should be done BEFORE syncing the filesystems.
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*/
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EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
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/*
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* Now sync filesystems
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*/
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if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
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register struct buf *bp;
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int iter, nbusy, pbusy;
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#ifndef PREEMPTION
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int subiter;
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#endif
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waittime = 0;
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sync(curthread, NULL);
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/*
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* With soft updates, some buffers that are
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* written will be remarked as dirty until other
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* buffers are written.
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*/
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for (iter = pbusy = 0; iter < 20; iter++) {
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nbusy = 0;
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for (bp = &buf[nbuf]; --bp >= buf; )
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if (isbufbusy(bp))
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nbusy++;
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if (nbusy == 0) {
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if (first_buf_printf)
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printf("All buffers synced.");
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break;
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}
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if (first_buf_printf) {
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printf("Syncing disks, buffers remaining... ");
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first_buf_printf = 0;
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}
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printf("%d ", nbusy);
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if (nbusy < pbusy)
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iter = 0;
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pbusy = nbusy;
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sync(curthread, NULL);
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#ifdef PREEMPTION
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/*
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* Drop Giant and spin for a while to allow
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* interrupt threads to run.
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*/
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DROP_GIANT();
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DELAY(50000 * iter);
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PICKUP_GIANT();
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#else
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/*
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* Drop Giant and context switch several times to
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* allow interrupt threads to run.
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*/
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DROP_GIANT();
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for (subiter = 0; subiter < 50 * iter; subiter++) {
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thread_lock(curthread);
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mi_switch(SW_VOL, NULL);
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thread_unlock(curthread);
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DELAY(1000);
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}
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PICKUP_GIANT();
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#endif
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}
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printf("\n");
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/*
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* Count only busy local buffers to prevent forcing
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* a fsck if we're just a client of a wedged NFS server
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*/
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nbusy = 0;
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for (bp = &buf[nbuf]; --bp >= buf; ) {
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if (isbufbusy(bp)) {
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#if 0
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/* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */
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if (bp->b_dev == NULL) {
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TAILQ_REMOVE(&mountlist,
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bp->b_vp->v_mount, mnt_list);
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continue;
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}
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#endif
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nbusy++;
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#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
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printf(
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"%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n",
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nbusy, bp->b_bufobj,
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bp->b_flags, (long)bp->b_blkno,
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(long)bp->b_lblkno);
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#endif
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}
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}
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if (nbusy) {
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/*
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* Failed to sync all blocks. Indicate this and don't
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* unmount filesystems (thus forcing an fsck on reboot).
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*/
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printf("Giving up on %d buffers\n", nbusy);
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DELAY(5000000); /* 5 seconds */
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} else {
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if (!first_buf_printf)
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printf("Final sync complete\n");
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/*
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* Unmount filesystems
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*/
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if (panicstr == 0)
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vfs_unmountall();
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}
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swapoff_all();
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DELAY(100000); /* wait for console output to finish */
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}
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print_uptime();
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/*
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* Ok, now do things that assume all filesystem activity has
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* been completed.
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*/
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EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
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if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
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doadump();
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/* Now that we're going to really halt the system... */
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EVENTHANDLER_INVOKE(shutdown_final, howto);
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for(;;) ; /* safety against shutdown_reset not working */
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/* NOTREACHED */
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}
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/*
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* If the shutdown was a clean halt, behave accordingly.
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*/
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static void
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shutdown_halt(void *junk, int howto)
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{
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if (howto & RB_HALT) {
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printf("\n");
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printf("The operating system has halted.\n");
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printf("Please press any key to reboot.\n\n");
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switch (cngetc()) {
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case -1: /* No console, just die */
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cpu_halt();
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/* NOTREACHED */
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default:
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howto &= ~RB_HALT;
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break;
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}
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}
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}
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/*
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* Check to see if the system paniced, pause and then reboot
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* according to the specified delay.
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*/
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static void
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shutdown_panic(void *junk, int howto)
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{
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int loop;
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if (howto & RB_DUMP) {
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if (PANIC_REBOOT_WAIT_TIME != 0) {
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if (PANIC_REBOOT_WAIT_TIME != -1) {
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printf("Automatic reboot in %d seconds - "
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"press a key on the console to abort\n",
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PANIC_REBOOT_WAIT_TIME);
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for (loop = PANIC_REBOOT_WAIT_TIME * 10;
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loop > 0; --loop) {
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DELAY(1000 * 100); /* 1/10th second */
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/* Did user type a key? */
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if (cncheckc() != -1)
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break;
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}
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if (!loop)
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return;
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}
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} else { /* zero time specified - reboot NOW */
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return;
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}
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printf("--> Press a key on the console to reboot,\n");
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printf("--> or switch off the system now.\n");
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cngetc();
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}
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}
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/*
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* Everything done, now reset
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*/
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static void
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shutdown_reset(void *junk, int howto)
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{
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printf("Rebooting...\n");
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DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
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/*
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* Acquiring smp_ipi_mtx here has a double effect:
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* - it disables interrupts avoiding CPU0 preemption
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* by fast handlers (thus deadlocking against other CPUs)
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* - it avoids deadlocks against smp_rendezvous() or, more
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* generally, threads busy-waiting, with this spinlock held,
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* and waiting for responses by threads on other CPUs
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* (ie. smp_tlb_shootdown()).
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*
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* For the !SMP case it just needs to handle the former problem.
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*/
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#ifdef SMP
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mtx_lock_spin(&smp_ipi_mtx);
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#else
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spinlock_enter();
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#endif
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/* cpu_boot(howto); */ /* doesn't do anything at the moment */
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cpu_reset();
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/* NOTREACHED */ /* assuming reset worked */
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}
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/*
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* Panic is called on unresolvable fatal errors. It prints "panic: mesg",
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* and then reboots. If we are called twice, then we avoid trying to sync
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* the disks as this often leads to recursive panics.
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*/
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void
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panic(const char *fmt, ...)
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|
{
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#ifdef SMP
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static volatile u_int panic_cpu = NOCPU;
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#endif
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struct thread *td = curthread;
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int bootopt, newpanic;
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va_list ap;
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static char buf[256];
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|
|
|
critical_enter();
|
|
#ifdef SMP
|
|
/*
|
|
* We don't want multiple CPU's to panic at the same time, so we
|
|
* use panic_cpu as a simple spinlock. We have to keep checking
|
|
* panic_cpu if we are spinning in case the panic on the first
|
|
* CPU is canceled.
|
|
*/
|
|
if (panic_cpu != PCPU_GET(cpuid))
|
|
while (atomic_cmpset_int(&panic_cpu, NOCPU,
|
|
PCPU_GET(cpuid)) == 0)
|
|
while (panic_cpu != NOCPU)
|
|
; /* nothing */
|
|
#endif
|
|
|
|
bootopt = RB_AUTOBOOT | RB_DUMP;
|
|
newpanic = 0;
|
|
if (panicstr)
|
|
bootopt |= RB_NOSYNC;
|
|
else {
|
|
panicstr = fmt;
|
|
newpanic = 1;
|
|
}
|
|
|
|
va_start(ap, fmt);
|
|
if (newpanic) {
|
|
(void)vsnprintf(buf, sizeof(buf), fmt, ap);
|
|
panicstr = buf;
|
|
printf("panic: %s\n", buf);
|
|
} else {
|
|
printf("panic: ");
|
|
vprintf(fmt, ap);
|
|
printf("\n");
|
|
}
|
|
va_end(ap);
|
|
#ifdef SMP
|
|
printf("cpuid = %d\n", PCPU_GET(cpuid));
|
|
#endif
|
|
|
|
#ifdef KDB
|
|
if (newpanic && trace_on_panic)
|
|
kdb_backtrace();
|
|
if (debugger_on_panic)
|
|
kdb_enter(KDB_WHY_PANIC, "panic");
|
|
#ifdef RESTARTABLE_PANICS
|
|
/* See if the user aborted the panic, in which case we continue. */
|
|
if (panicstr == NULL) {
|
|
#ifdef SMP
|
|
atomic_store_rel_int(&panic_cpu, NOCPU);
|
|
#endif
|
|
return;
|
|
}
|
|
#endif
|
|
#endif
|
|
/*thread_lock(td); */
|
|
td->td_flags |= TDF_INPANIC;
|
|
/* thread_unlock(td); */
|
|
if (!sync_on_panic)
|
|
bootopt |= RB_NOSYNC;
|
|
critical_exit();
|
|
boot(bootopt);
|
|
}
|
|
|
|
/*
|
|
* Support for poweroff delay.
|
|
*
|
|
* Please note that setting this delay too short might power off your machine
|
|
* before the write cache on your hard disk has been flushed, leading to
|
|
* soft-updates inconsistencies.
|
|
*/
|
|
#ifndef POWEROFF_DELAY
|
|
# define POWEROFF_DELAY 5000
|
|
#endif
|
|
static int poweroff_delay = POWEROFF_DELAY;
|
|
|
|
SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
|
|
&poweroff_delay, 0, "");
|
|
|
|
static void
|
|
poweroff_wait(void *junk, int howto)
|
|
{
|
|
|
|
if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
|
|
return;
|
|
DELAY(poweroff_delay * 1000);
|
|
}
|
|
|
|
/*
|
|
* Some system processes (e.g. syncer) need to be stopped at appropriate
|
|
* points in their main loops prior to a system shutdown, so that they
|
|
* won't interfere with the shutdown process (e.g. by holding a disk buf
|
|
* to cause sync to fail). For each of these system processes, register
|
|
* shutdown_kproc() as a handler for one of shutdown events.
|
|
*/
|
|
static int kproc_shutdown_wait = 60;
|
|
SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
|
|
&kproc_shutdown_wait, 0, "");
|
|
|
|
void
|
|
kproc_shutdown(void *arg, int howto)
|
|
{
|
|
struct proc *p;
|
|
int error;
|
|
|
|
if (panicstr)
|
|
return;
|
|
|
|
p = (struct proc *)arg;
|
|
printf("Waiting (max %d seconds) for system process `%s' to stop...",
|
|
kproc_shutdown_wait, p->p_comm);
|
|
error = kproc_suspend(p, kproc_shutdown_wait * hz);
|
|
|
|
if (error == EWOULDBLOCK)
|
|
printf("timed out\n");
|
|
else
|
|
printf("done\n");
|
|
}
|
|
|
|
void
|
|
kthread_shutdown(void *arg, int howto)
|
|
{
|
|
struct thread *td;
|
|
int error;
|
|
|
|
if (panicstr)
|
|
return;
|
|
|
|
td = (struct thread *)arg;
|
|
printf("Waiting (max %d seconds) for system thread `%s' to stop...",
|
|
kproc_shutdown_wait, td->td_name);
|
|
error = kthread_suspend(td, kproc_shutdown_wait * hz);
|
|
|
|
if (error == EWOULDBLOCK)
|
|
printf("timed out\n");
|
|
else
|
|
printf("done\n");
|
|
}
|
|
|
|
/* Registration of dumpers */
|
|
int
|
|
set_dumper(struct dumperinfo *di)
|
|
{
|
|
|
|
if (di == NULL) {
|
|
bzero(&dumper, sizeof dumper);
|
|
return (0);
|
|
}
|
|
if (dumper.dumper != NULL)
|
|
return (EBUSY);
|
|
dumper = *di;
|
|
return (0);
|
|
}
|
|
|
|
/* Call dumper with bounds checking. */
|
|
int
|
|
dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
|
|
off_t offset, size_t length)
|
|
{
|
|
|
|
if (length != 0 && (offset < di->mediaoffset ||
|
|
offset - di->mediaoffset + length > di->mediasize)) {
|
|
printf("Attempt to write outside dump device boundaries.\n");
|
|
return (ENXIO);
|
|
}
|
|
return (di->dumper(di->priv, virtual, physical, offset, length));
|
|
}
|
|
|
|
void
|
|
mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
|
|
uint64_t dumplen, uint32_t blksz)
|
|
{
|
|
|
|
bzero(kdh, sizeof(*kdh));
|
|
strncpy(kdh->magic, magic, sizeof(kdh->magic));
|
|
strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
|
|
kdh->version = htod32(KERNELDUMPVERSION);
|
|
kdh->architectureversion = htod32(archver);
|
|
kdh->dumplength = htod64(dumplen);
|
|
kdh->dumptime = htod64(time_second);
|
|
kdh->blocksize = htod32(blksz);
|
|
strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname));
|
|
strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
|
|
if (panicstr != NULL)
|
|
strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
|
|
kdh->parity = kerneldump_parity(kdh);
|
|
}
|