47d818975b
When a panic occurs early in the SMP boot process 'cpunumber()' hangs, causing the panic string to be lost. Now the system appears to hang in 'breakpoint()', but at least the user sees the panic string before the hang.
470 lines
11 KiB
C
470 lines
11 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* $Id: kern_shutdown.c,v 1.14 1997/04/26 11:46:14 peter Exp $
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*/
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/reboot.h>
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#include <sys/msgbuf.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/tty.h>
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#include <sys/tprintf.h>
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#include <sys/syslog.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/mount.h>
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#include <sys/sysctl.h>
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#include <sys/conf.h>
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#include <sys/sysproto.h>
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#include <machine/pcb.h>
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#include <machine/clock.h>
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#include <machine/cons.h>
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#include <machine/md_var.h>
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#include <sys/utsname.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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#if defined(DDB)
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#ifdef DDB_UNATTENDED
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static int debugger_on_panic = 0;
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#else
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static int debugger_on_panic = 1;
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#endif
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SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
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&debugger_on_panic, 0, "");
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#endif
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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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/*
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* callout list for things to do a shutdown
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*/
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typedef struct shutdown_list_element {
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struct shutdown_list_element *next;
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bootlist_fn function;
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void *arg;
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} *sle_p;
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/*
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* there are two shutdown lists. Some things need to be shut down
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* Earlier than others.
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*/
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static sle_p shutdown_list1;
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static sle_p shutdown_list2;
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static void dumpsys(void);
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#ifndef _SYS_SYSPROTO_H_
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struct reboot_args {
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int opt;
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};
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#endif
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/* ARGSUSED */
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/*
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* The system call that results in a reboot
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*/
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int
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reboot(p, uap, retval)
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struct proc *p;
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struct reboot_args *uap;
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int *retval;
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{
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int error;
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if ((error = suser(p->p_ucred, &p->p_acflag)))
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return (error);
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boot(uap->opt);
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return (0);
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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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void
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shutdown_nice(void)
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{
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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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psignal(initproc, SIGINT);
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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 struct pcb dumppcb;
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/*
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* Go through the rigmarole of shutting down..
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* this used to be in machdep.c but I'll be dammned if I could see
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* anything machine dependant in it.
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*/
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void
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boot(howto)
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int howto;
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{
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sle_p ep;
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#ifdef SMP
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int c, spins;
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/* don't accidently start it */
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if (smp_active) {
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smp_active = 1;
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spins = 100;
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printf("boot() called on cpu#%d\n", cpunumber());
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while ((c = cpunumber()) != 0) {
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if (spins-- < 1) {
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printf("timeout waiting for cpu #0!\n");
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break;
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}
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printf("oops, I'm on cpu#%d, I need to be on cpu#0!\n",
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c);
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tsleep((caddr_t)&smp_active, PZERO, "cpu0wt", 10);
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}
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}
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#endif
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ep = shutdown_list1;
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while (ep) {
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shutdown_list1 = ep->next;
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(*ep->function)(howto, ep->arg);
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ep = ep->next;
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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;
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waittime = 0;
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printf("\nsyncing disks... ");
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sync(&proc0, NULL, NULL);
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for (iter = 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 ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) {
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nbusy++;
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}
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}
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if (nbusy == 0)
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break;
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printf("%d ", nbusy);
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DELAY(40000 * iter);
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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\n");
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#ifdef SHOW_BUSYBUFS
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nbusy = 0;
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for (bp = &buf[nbuf]; --bp >= buf; ) {
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if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) {
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nbusy++;
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printf("%d: dev:%08x, flags:%08x, blkno:%d, lblkno:%d\n", nbusy, bp->b_dev, bp->b_flags, bp->b_blkno, bp->b_lblkno);
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}
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}
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DELAY(5000000); /* 5 seconds */
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#endif
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} else {
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printf("done\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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DELAY(100000); /* wait for console output to finish */
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}
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ep = shutdown_list2;
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while (ep) {
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shutdown_list2 = ep->next;
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(*ep->function)(howto, ep->arg);
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ep = ep->next;
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}
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splhigh();
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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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break;
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}
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} else {
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if (howto & RB_DUMP) {
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if (!cold) {
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savectx(&dumppcb);
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dumppcb.pcb_cr3 = rcr3();
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dumpsys();
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}
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if (PANIC_REBOOT_WAIT_TIME != 0) {
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if (PANIC_REBOOT_WAIT_TIME != -1) {
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int loop;
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printf("Automatic reboot in %d seconds - 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; 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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goto die;
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}
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} else { /* zero time specified - reboot NOW */
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goto die;
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}
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printf("--> Press a key on the console to reboot <--\n");
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cngetc();
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}
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}
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die:
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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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/* cpu_boot(howto); */ /* doesn't do anything at the moment */
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cpu_reset();
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for(;;) ;
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/* NOTREACHED */
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}
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/*
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* Magic number for savecore
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*
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* exported (symorder) and used at least by savecore(8)
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*
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*/
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static u_long const dumpmag = 0x8fca0101UL;
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static int dumpsize = 0; /* also for savecore */
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static int dodump = 1;
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SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, "");
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/*
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* Doadump comes here after turning off memory management and
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* getting on the dump stack, either when called above, or by
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* the auto-restart code.
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*/
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static void
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dumpsys(void)
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{
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if (!dodump)
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return;
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if (dumpdev == NODEV)
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return;
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if ((minor(dumpdev)&07) != 1)
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return;
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if (!(bdevsw[major(dumpdev)]))
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return;
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if (!(bdevsw[major(dumpdev)]->d_dump))
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return;
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dumpsize = Maxmem;
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printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo);
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printf("dump ");
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switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) {
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case ENXIO:
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printf("device bad\n");
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break;
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case EFAULT:
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printf("device not ready\n");
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break;
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case EINVAL:
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printf("area improper\n");
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break;
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case EIO:
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printf("i/o error\n");
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break;
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case EINTR:
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printf("aborted from console\n");
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break;
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default:
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printf("succeeded\n");
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break;
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}
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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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int bootopt;
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va_list ap;
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bootopt = RB_AUTOBOOT | RB_DUMP;
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if (panicstr)
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bootopt |= RB_NOSYNC;
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else
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panicstr = fmt;
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printf("panic: ");
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va_start(ap, fmt);
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vprintf(fmt, ap);
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va_end(ap);
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printf("\n");
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#ifdef SMP
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printf(" cpu#%d\n", cpunumber());
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#endif
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#if defined(DDB)
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if (debugger_on_panic)
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Debugger ("panic");
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#endif
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boot(bootopt);
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}
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/*
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* Two routines to handle adding/deleting items on the
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* shutdown callout lists
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*
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* at_shutdown():
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* Take the arguments given and put them onto the shutdown callout list.
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* However first make sure that it's not already there.
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* returns 0 on success.
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*/
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int
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at_shutdown(bootlist_fn function, void *arg, int position)
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{
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sle_p ep, *epp;
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switch(position) {
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case SHUTDOWN_PRE_SYNC:
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epp = &shutdown_list1;
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break;
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case SHUTDOWN_POST_SYNC:
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epp = &shutdown_list2;
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break;
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default:
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printf("bad exit callout list specified\n");
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return (EINVAL);
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}
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if (rm_at_shutdown(function, arg))
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printf("exit callout entry already present\n");
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ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT);
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if (ep == NULL)
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return (ENOMEM);
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ep->next = *epp;
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ep->function = function;
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ep->arg = arg;
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*epp = ep;
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return (0);
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}
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/*
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* Scan the exit callout lists for the given items and remove them.
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* Returns the number of items removed.
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*/
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int
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rm_at_shutdown(bootlist_fn function, void *arg)
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{
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sle_p *epp, ep;
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int count;
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count = 0;
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epp = &shutdown_list1;
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ep = *epp;
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while (ep) {
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if ((ep->function == function) && (ep->arg == arg)) {
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*epp = ep->next;
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free(ep, M_TEMP);
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count++;
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} else {
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epp = &ep->next;
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}
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ep = *epp;
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}
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epp = &shutdown_list2;
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ep = *epp;
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while (ep) {
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if ((ep->function == function) && (ep->arg == arg)) {
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*epp = ep->next;
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free(ep, M_TEMP);
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count++;
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} else {
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epp = &ep->next;
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}
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ep = *epp;
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}
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return (count);
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}
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