freebsd-dev/sys/kern/kern_shutdown.c
Julian Elischer 7f2f1b784e Add dump support to the DEVFS/slice code.
now we can actually catch our crashes :-)

Submitted by: Luoqi Chen <luoqi@chen.ml.org> (the man who's everywhere)
1998-05-06 22:14:48 +00:00

519 lines
12 KiB
C

/*-
* Copyright (c) 1986, 1988, 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
* $Id: kern_shutdown.c,v 1.29 1998/03/08 09:56:54 julian Exp $
*/
#include "opt_ddb.h"
#include "opt_hw_wdog.h"
#include "opt_panic.h"
#include "opt_show_busybufs.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/reboot.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/sysctl.h>
#include <sys/conf.h>
#include <sys/sysproto.h>
#include <sys/disklabel.h>
#include <machine/pcb.h>
#include <machine/clock.h>
#include <machine/cons.h>
#include <machine/md_var.h>
#ifdef SMP
#include <machine/smp.h> /* smp_active, cpuid */
#endif
#include <sys/signalvar.h>
#ifndef PANIC_REBOOT_WAIT_TIME
#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
#endif
/*
* Note that stdarg.h and the ANSI style va_start macro is used for both
* ANSI and traditional C compilers.
*/
#include <machine/stdarg.h>
#ifdef DDB
#ifdef DDB_UNATTENDED
static int debugger_on_panic = 0;
#else
static int debugger_on_panic = 1;
#endif
SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
&debugger_on_panic, 0, "");
#endif
#ifdef HW_WDOG
/*
* If there is a hardware watchdog, point this at the function needed to
* hold it off.
* It's needed when the kernel needs to do some lengthy operations.
* e.g. in wd.c when dumping core.. It's most annoying to have
* your precious core-dump only half written because the wdog kicked in.
*/
watchdog_tickle_fn wdog_tickler = NULL;
#endif /* HW_WDOG */
/*
* Variable panicstr contains argument to first call to panic; used as flag
* to indicate that the kernel has already called panic.
*/
const char *panicstr;
/*
* callout list for things to do a shutdown
*/
typedef struct shutdown_list_element {
struct shutdown_list_element *next;
bootlist_fn function;
void *arg;
} *sle_p;
/*
* there are two shutdown lists. Some things need to be shut down
* Earlier than others.
*/
static sle_p shutdown_list1;
static sle_p shutdown_list2;
static void boot __P((int)) __dead2;
static void dumpsys __P((void));
#ifndef _SYS_SYSPROTO_H_
struct reboot_args {
int opt;
};
#endif
/* ARGSUSED */
/*
* The system call that results in a reboot
*/
int
reboot(p, uap)
struct proc *p;
struct reboot_args *uap;
{
int error;
if ((error = suser(p->p_ucred, &p->p_acflag)))
return (error);
boot(uap->opt);
return (0);
}
/*
* Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
*/
void
shutdown_nice()
{
/* Send a signal to init(8) and have it shutdown the world */
if (initproc != NULL) {
psignal(initproc, SIGINT);
} else {
/* No init(8) running, so simply reboot */
boot(RB_NOSYNC);
}
return;
}
static int waittime = -1;
static struct pcb dumppcb;
/*
* Go through the rigmarole of shutting down..
* this used to be in machdep.c but I'll be dammned if I could see
* anything machine dependant in it.
*/
static void
boot(howto)
int howto;
{
sle_p ep;
#ifdef SMP
int c, spins;
/* The MPSPEC says that the BSP must do the shutdown */
if (smp_active) {
smp_active = 0;
spins = 100;
printf("boot() called on cpu#%d\n", cpuid);
while ((c = cpuid) != 0) {
if (spins-- < 1) {
printf("timeout waiting for cpu #0!\n");
break;
}
printf("I'm on cpu#%d, I need to be on cpu#0, sleeping..\n", c);
tsleep((caddr_t)&smp_active, PZERO, "cpu0wt", 10);
}
}
#endif
/*
* Do any callouts that should be done BEFORE syncing the filesystems.
*/
ep = shutdown_list1;
while (ep) {
shutdown_list1 = ep->next;
(*ep->function)(howto, ep->arg);
ep = ep->next;
}
/*
* Now sync filesystems
*/
if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
register struct buf *bp;
int iter, nbusy;
waittime = 0;
printf("\nsyncing disks... ");
sync(&proc0, NULL);
/*
* With soft updates, some buffers that are
* written will be remarked as dirty until other
* buffers are written.
*/
for (iter = 0; iter < 20; iter++) {
nbusy = 0;
for (bp = &buf[nbuf]; --bp >= buf; ) {
if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) {
nbusy++;
} else if ((bp->b_flags & (B_DELWRI | B_INVAL))
== B_DELWRI) {
/* bawrite(bp);*/
nbusy++;
}
}
if (nbusy == 0)
break;
printf("%d ", nbusy);
sync(&proc0, NULL);
DELAY(50000 * iter);
}
if (nbusy) {
/*
* Failed to sync all blocks. Indicate this and don't
* unmount filesystems (thus forcing an fsck on reboot).
*/
printf("giving up\n");
#ifdef SHOW_BUSYBUFS
nbusy = 0;
for (bp = &buf[nbuf]; --bp >= buf; ) {
if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) {
nbusy++;
printf("%d: dev:%08x, flags:%08x, blkno:%d, lblkno:%d\n", nbusy, bp->b_dev, bp->b_flags, bp->b_blkno, bp->b_lblkno);
}
}
DELAY(5000000); /* 5 seconds */
#endif
} else {
printf("done\n");
/*
* Unmount filesystems
*/
if (panicstr == 0)
vfs_unmountall();
}
DELAY(100000); /* wait for console output to finish */
}
/*
* Ok, now do things that assume all filesystem activity has
* been completed.
*/
ep = shutdown_list2;
while (ep) {
shutdown_list2 = ep->next;
(*ep->function)(howto, ep->arg);
ep = ep->next;
}
splhigh();
if (howto & RB_HALT) {
cpu_power_down();
printf("\n");
printf("The operating system has halted.\n");
printf("Please press any key to reboot.\n\n");
switch (cngetc()) {
case -1: /* No console, just die */
cpu_halt();
/* NOTREACHED */
default:
break;
}
} else {
if (howto & RB_DUMP) {
if (!cold) {
savectx(&dumppcb);
dumppcb.pcb_cr3 = rcr3();
dumpsys();
}
if (PANIC_REBOOT_WAIT_TIME != 0) {
if (PANIC_REBOOT_WAIT_TIME != -1) {
int loop;
printf("Automatic reboot in %d seconds - press a key on the console to abort\n",
PANIC_REBOOT_WAIT_TIME);
for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) {
DELAY(1000 * 100); /* 1/10th second */
/* Did user type a key? */
if (cncheckc() != -1)
break;
}
if (!loop)
goto die;
}
} else { /* zero time specified - reboot NOW */
goto die;
}
printf("--> Press a key on the console to reboot <--\n");
cngetc();
}
}
die:
printf("Rebooting...\n");
DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
/* cpu_boot(howto); */ /* doesn't do anything at the moment */
cpu_reset();
for(;;) ;
/* NOTREACHED */
}
/*
* Magic number for savecore
*
* exported (symorder) and used at least by savecore(8)
*
*/
static u_long const dumpmag = 0x8fca0101UL;
static int dumpsize = 0; /* also for savecore */
static int dodump = 1;
SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, "");
/* ARGSUSED */
static void dump_conf __P((void *dummy));
static void
dump_conf(dummy)
void *dummy;
{
cpu_dumpconf();
}
SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
/*
* Doadump comes here after turning off memory management and
* getting on the dump stack, either when called above, or by
* the auto-restart code.
*/
static void
dumpsys(void)
{
struct partinfo pi;
if (!dodump)
return;
if (dumpdev == NODEV)
return;
if (!(bdevsw[major(dumpdev)]))
return;
if (!(bdevsw[major(dumpdev)]->d_dump))
return;
if ((*bdevsw[major(dumpdev)]->d_ioctl)(dumpdev, DIOCGPART,
(caddr_t)&pi, 0, NULL))
return;
if (pi.part->p_fstype != FS_SWAP)
return;
dumpsize = Maxmem;
printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo);
printf("dump ");
switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) {
case ENXIO:
printf("device bad\n");
break;
case EFAULT:
printf("device not ready\n");
break;
case EINVAL:
printf("area improper\n");
break;
case EIO:
printf("i/o error\n");
break;
case EINTR:
printf("aborted from console\n");
break;
default:
printf("succeeded\n");
break;
}
}
/*
* Panic is called on unresolvable fatal errors. It prints "panic: mesg",
* and then reboots. If we are called twice, then we avoid trying to sync
* the disks as this often leads to recursive panics.
*/
void
panic(const char *fmt, ...)
{
int bootopt;
va_list ap;
bootopt = RB_AUTOBOOT | RB_DUMP;
if (panicstr)
bootopt |= RB_NOSYNC;
else
panicstr = fmt;
printf("panic: ");
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
printf("\n");
#ifdef SMP
/* three seperate prints in case of an unmapped page and trap */
printf("mp_lock = %08x; ", mp_lock);
printf("cpuid = %d; ", cpuid);
printf("lapic.id = %08x\n", lapic.id);
#endif
#if defined(DDB)
if (debugger_on_panic)
Debugger ("panic");
#endif
boot(bootopt);
}
/*
* Two routines to handle adding/deleting items on the
* shutdown callout lists
*
* at_shutdown():
* Take the arguments given and put them onto the shutdown callout list.
* However first make sure that it's not already there.
* returns 0 on success.
*/
int
at_shutdown(bootlist_fn function, void *arg, int position)
{
sle_p ep, *epp;
switch(position) {
case SHUTDOWN_PRE_SYNC:
epp = &shutdown_list1;
break;
case SHUTDOWN_POST_SYNC:
epp = &shutdown_list2;
break;
default:
printf("bad exit callout list specified\n");
return (EINVAL);
}
if (rm_at_shutdown(function, arg))
printf("exit callout entry already present\n");
ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT);
if (ep == NULL)
return (ENOMEM);
ep->next = *epp;
ep->function = function;
ep->arg = arg;
*epp = ep;
return (0);
}
/*
* Scan the exit callout lists for the given items and remove them.
* Returns the number of items removed.
*/
int
rm_at_shutdown(bootlist_fn function, void *arg)
{
sle_p *epp, ep;
int count;
count = 0;
epp = &shutdown_list1;
ep = *epp;
while (ep) {
if ((ep->function == function) && (ep->arg == arg)) {
*epp = ep->next;
free(ep, M_TEMP);
count++;
} else {
epp = &ep->next;
}
ep = *epp;
}
epp = &shutdown_list2;
ep = *epp;
while (ep) {
if ((ep->function == function) && (ep->arg == arg)) {
*epp = ep->next;
free(ep, M_TEMP);
count++;
} else {
epp = &ep->next;
}
ep = *epp;
}
return (count);
}