88ab7da936
- kthread, callout, devsw API changes - select()/poll() improvements - miscellaneous MT safety improvements
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 $ */
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/*
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* Copyright (c) 2004, 2005 Steven M. Bellovin
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* All rights reserved.
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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 Steven M. Bellovin
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* 4. The name of the author contributors may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: swwdog.c,v 1.7 2007/07/09 21:01:23 ad Exp $");
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/*
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*
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* Software watchdog timer
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*
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*/
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#include <sys/param.h>
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#include <sys/callout.h>
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#include <sys/device.h>
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#include <sys/kernel.h>
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#include <sys/reboot.h>
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#include <sys/systm.h>
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#include <sys/wdog.h>
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#include <dev/sysmon/sysmonvar.h>
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#include "swwdog.h"
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struct swwdog_softc {
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struct sysmon_wdog sc_smw;
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struct callout sc_c;
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char sc_name[20];
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int sc_wdog_armed;
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} sc_wdog[NSWWDOG];
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void swwdogattach(int);
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static int swwdog_setmode(struct sysmon_wdog *);
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static int swwdog_tickle(struct sysmon_wdog *);
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static int swwdog_arm(struct swwdog_softc *);
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static int swwdog_disarm(struct swwdog_softc *);
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static void swwdog_panic(void *);
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int swwdog_reboot = 0; /* set for panic instead of reboot */
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#define SWDOG_DEFAULT 60 /* 60-second default period */
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void
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swwdogattach(int count __unused)
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{
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int i;
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for (i = 0; i < NSWWDOG; i++) {
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struct swwdog_softc *sc = &sc_wdog[i];
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snprintf(sc->sc_name, sizeof sc->sc_name, "swwdog%d", i);
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printf("%s: ", sc->sc_name);
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sc->sc_smw.smw_name = sc->sc_name;
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sc->sc_smw.smw_cookie = sc;
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sc->sc_smw.smw_setmode = swwdog_setmode;
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sc->sc_smw.smw_tickle = swwdog_tickle;
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sc->sc_smw.smw_period = SWDOG_DEFAULT;
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callout_init(&sc->sc_c, 0);
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callout_setfunc(&sc->sc_c, swwdog_panic, sc);
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if (sysmon_wdog_register(&sc->sc_smw) == 0)
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printf("software watchdog initialized\n");
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else
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printf("unable to register software watchdog "
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"with sysmon\n");
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}
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}
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static int
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swwdog_setmode(struct sysmon_wdog *smw)
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{
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struct swwdog_softc *sc = smw->smw_cookie;
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int error = 0;
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if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
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error = swwdog_disarm(sc);
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} else {
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if (smw->smw_period == 0)
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return EINVAL;
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else if (smw->smw_period == WDOG_PERIOD_DEFAULT)
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sc->sc_smw.smw_period = SWDOG_DEFAULT;
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else
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sc->sc_smw.smw_period = smw->smw_period;
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error = swwdog_arm(sc);
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}
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return error;
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}
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static int
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swwdog_tickle(struct sysmon_wdog *smw)
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{
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return swwdog_arm(smw->smw_cookie);
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}
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static int
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swwdog_arm(struct swwdog_softc *sc)
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{
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callout_schedule(&sc->sc_c, sc->sc_smw.smw_period * hz);
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return 0;
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}
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static int
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swwdog_disarm(struct swwdog_softc *sc)
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{
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callout_stop(&sc->sc_c);
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return 0;
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}
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static void
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swwdog_panic(void *vsc)
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{
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struct swwdog_softc *sc = vsc;
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int do_panic;
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do_panic = swwdog_reboot;
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swwdog_reboot = 1;
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callout_schedule(&sc->sc_c, 60 * hz); /* deliberate double-panic */
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printf("%s: %d second timer expired", sc->sc_name,
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sc->sc_smw.smw_period);
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if (do_panic)
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panic("watchdog timer expired");
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else
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cpu_reboot(0, NULL);
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}
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