162 lines
4.3 KiB
C
162 lines
4.3 KiB
C
/* $NetBSD: swwdog.c,v 1.7 2007/07/09 21:01:23 ad Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2004, 2005 Steven M. Bellovin
|
|
* All rights reserved.
|
|
*
|
|
* 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 Steven M. Bellovin
|
|
* 4. The name of the author contributors may not be used to endorse or
|
|
* promote products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: swwdog.c,v 1.7 2007/07/09 21:01:23 ad Exp $");
|
|
|
|
/*
|
|
*
|
|
* Software watchdog timer
|
|
*
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/callout.h>
|
|
#include <sys/device.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/reboot.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/wdog.h>
|
|
#include <dev/sysmon/sysmonvar.h>
|
|
|
|
#include "swwdog.h"
|
|
|
|
struct swwdog_softc {
|
|
struct sysmon_wdog sc_smw;
|
|
struct callout sc_c;
|
|
char sc_name[20];
|
|
int sc_wdog_armed;
|
|
} sc_wdog[NSWWDOG];
|
|
|
|
void swwdogattach(int);
|
|
|
|
static int swwdog_setmode(struct sysmon_wdog *);
|
|
static int swwdog_tickle(struct sysmon_wdog *);
|
|
|
|
static int swwdog_arm(struct swwdog_softc *);
|
|
static int swwdog_disarm(struct swwdog_softc *);
|
|
|
|
static void swwdog_panic(void *);
|
|
|
|
int swwdog_reboot = 0; /* set for panic instead of reboot */
|
|
|
|
#define SWDOG_DEFAULT 60 /* 60-second default period */
|
|
|
|
void
|
|
swwdogattach(int count __unused)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < NSWWDOG; i++) {
|
|
struct swwdog_softc *sc = &sc_wdog[i];
|
|
|
|
snprintf(sc->sc_name, sizeof sc->sc_name, "swwdog%d", i);
|
|
printf("%s: ", sc->sc_name);
|
|
sc->sc_smw.smw_name = sc->sc_name;
|
|
sc->sc_smw.smw_cookie = sc;
|
|
sc->sc_smw.smw_setmode = swwdog_setmode;
|
|
sc->sc_smw.smw_tickle = swwdog_tickle;
|
|
sc->sc_smw.smw_period = SWDOG_DEFAULT;
|
|
callout_init(&sc->sc_c, 0);
|
|
callout_setfunc(&sc->sc_c, swwdog_panic, sc);
|
|
|
|
if (sysmon_wdog_register(&sc->sc_smw) == 0)
|
|
printf("software watchdog initialized\n");
|
|
else
|
|
printf("unable to register software watchdog "
|
|
"with sysmon\n");
|
|
}
|
|
}
|
|
|
|
static int
|
|
swwdog_setmode(struct sysmon_wdog *smw)
|
|
{
|
|
struct swwdog_softc *sc = smw->smw_cookie;
|
|
int error = 0;
|
|
|
|
if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
|
|
error = swwdog_disarm(sc);
|
|
} else {
|
|
if (smw->smw_period == 0)
|
|
return EINVAL;
|
|
else if (smw->smw_period == WDOG_PERIOD_DEFAULT)
|
|
sc->sc_smw.smw_period = SWDOG_DEFAULT;
|
|
else
|
|
sc->sc_smw.smw_period = smw->smw_period;
|
|
error = swwdog_arm(sc);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
swwdog_tickle(struct sysmon_wdog *smw)
|
|
{
|
|
|
|
return swwdog_arm(smw->smw_cookie);
|
|
}
|
|
|
|
static int
|
|
swwdog_arm(struct swwdog_softc *sc)
|
|
{
|
|
|
|
callout_schedule(&sc->sc_c, sc->sc_smw.smw_period * hz);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
swwdog_disarm(struct swwdog_softc *sc)
|
|
{
|
|
|
|
callout_stop(&sc->sc_c);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
swwdog_panic(void *vsc)
|
|
{
|
|
struct swwdog_softc *sc = vsc;
|
|
int do_panic;
|
|
|
|
do_panic = swwdog_reboot;
|
|
swwdog_reboot = 1;
|
|
callout_schedule(&sc->sc_c, 60 * hz); /* deliberate double-panic */
|
|
|
|
printf("%s: %d second timer expired", sc->sc_name,
|
|
sc->sc_smw.smw_period);
|
|
|
|
if (do_panic)
|
|
panic("watchdog timer expired");
|
|
else
|
|
cpu_reboot(0, NULL);
|
|
}
|