freebsd-dev/sys/kern/kern_shutdown.c

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/*-
* 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 1.53 1999/06/26 02:46:02 mckusick 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/vnode.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <sys/conf.h>
#include <sys/sysproto.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
int debugger_on_panic = 0;
#else
int debugger_on_panic = 1;
#endif
SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
&debugger_on_panic, 0, "Run debugger on kernel panic");
#endif
SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
#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 {
LIST_ENTRY(shutdown_list_element) links;
bootlist_fn function;
void *arg;
int priority;
} *sle_p;
/*
* There are three shutdown lists. Some things need to be shut down
* earlier than others.
*/
LIST_HEAD(shutdown_list, shutdown_list_element);
static struct shutdown_list shutdown_lists[SHUTDOWN_FINAL + 1];
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)))
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
if (smp_active) {
printf("boot() called on cpu#%d\n", cpuid);
}
#endif
/*
* Do any callouts that should be done BEFORE syncing the filesystems.
*/
LIST_FOREACH(ep, &shutdown_lists[SHUTDOWN_PRE_SYNC], links)
(*ep->function)(howto, ep->arg);
/*
* 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_INVAL) == 0 &&
BUF_REFCNT(bp) > 0) {
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);
}
/*
* Count only busy local buffers to prevent forcing
* a fsck if we're just a client of a wedged NFS server
*/
nbusy = 0;
for (bp = &buf[nbuf]; --bp >= buf; ) {
if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
if (bp->b_dev == NODEV)
CIRCLEQ_REMOVE(&mountlist,
bp->b_vp->v_mount, mnt_list);
else
nbusy++;
}
}
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_INVAL) == 0 &&
BUF_REFCNT(bp) > 0) {
nbusy++;
1998-07-11 07:46:16 +00:00
printf(
"%d: dev:%08lx, flags:%08lx, blkno:%ld, lblkno:%ld\n",
nbusy, (u_long)bp->b_dev,
bp->b_flags, (long)bp->b_blkno,
(long)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.
*/
LIST_FOREACH(ep, &shutdown_lists[SHUTDOWN_POST_SYNC], links)
(*ep->function)(howto, ep->arg);
splhigh();
if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) {
savectx(&dumppcb);
#ifdef __i386__
dumppcb.pcb_cr3 = rcr3();
#endif
dumpsys();
}
/* Now that we're going to really halt the system... */
LIST_FOREACH(ep, &shutdown_lists[SHUTDOWN_FINAL], links)
(*ep->function)(howto, ep->arg);
if (howto & RB_HALT) {
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:
howto &= ~RB_HALT;
break;
}
} else if (howto & RB_DUMP) {
/* System Paniced */
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, "Do coredump on kernel panic");
/* 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)
{
if (!dodump)
return;
if (dumpdev == NODEV)
return;
if (!(bdevsw(dumpdev)))
return;
if (!(bdevsw(dumpdev)->d_dump))
return;
dumpsize = Maxmem;
printf("\ndumping to dev (%d,%d), offset %ld\n",
major(dumpdev), minor(dumpdev), dumplo);
printf("dump ");
switch ((*bdevsw(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;
static char buf[256];
bootopt = RB_AUTOBOOT | RB_DUMP;
if (panicstr)
bootopt |= RB_NOSYNC;
else
panicstr = fmt;
va_start(ap, fmt);
(void)vsnprintf(buf, sizeof(buf), fmt, ap);
if (panicstr == fmt)
panicstr = buf;
va_end(ap);
printf("panic: %s\n", buf);
#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);
}
/*
* Three 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 queue)
{
return(at_shutdown_pri(function, arg, queue, SHUTDOWN_PRI_DEFAULT));
}
/*
* at_shutdown_pri():
* Take the arguments given and put them onto the shutdown callout list
* with the given execution priority.
* returns 0 on success.
*/
int
at_shutdown_pri(bootlist_fn function, void *arg, int queue, int pri)
{
sle_p op, ep, ip;
op = NULL; /* shut up gcc */
if (queue < SHUTDOWN_PRE_SYNC
|| queue > SHUTDOWN_FINAL) {
printf("at_shutdown: bad exit callout queue %d specified\n",
queue);
return (EINVAL);
}
if (rm_at_shutdown(function, arg))
printf("at_shutdown: exit callout entry was already present\n");
ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT);
if (ep == NULL)
return (ENOMEM);
ep->function = function;
ep->arg = arg;
ep->priority = pri;
/* Sort into list of items on this queue */
ip = LIST_FIRST(&shutdown_lists[queue]);
if (ip == NULL) {
LIST_INSERT_HEAD(&shutdown_lists[queue], ep, links);
} else {
for (; ip != NULL; op = ip, ip = LIST_NEXT(ip, links)) {
if (ep->priority < ip->priority) {
LIST_INSERT_BEFORE(ip, ep, links);
ep = NULL;
break;
}
}
if (ep != NULL)
LIST_INSERT_AFTER(op, ep, links);
}
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 ep;
int count;
int queue;
count = 0;
for (queue = SHUTDOWN_PRE_SYNC; queue < SHUTDOWN_FINAL; queue++) {
LIST_FOREACH(ep, &shutdown_lists[queue], links) {
if ((ep->function == function) && (ep->arg == arg)) {
LIST_REMOVE(ep, links);
free(ep, M_TEMP);
count++;
}
}
}
return (count);
}
/*
* Support for poweroff delay.
*/
static int poweroff_delay = 0;
SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
&poweroff_delay, 0, "");
static void poweroff_wait(int howto, void *unused)
{
if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
return;
DELAY(poweroff_delay * 1000);
}
/*
* XXX OK? This implies I know SHUTDOWN_PRI_LAST > SHUTDOWN_PRI_FIRST
*/
static void poweroff_conf(void *unused)
{
at_shutdown_pri(poweroff_wait, NULL, SHUTDOWN_FINAL, SHUTDOWN_PRI_FIRST);
}
SYSINIT(poweroff_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, poweroff_conf, NULL)