/* $Id: shutdown_xenbus.c,v 1.7 2011/09/20 00:12:24 jym Exp $ */
/*-
* Copyright (c)2006 YAMAMOTO Takashi,
* 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.
*
* 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.
*/
/*
* Copyright (c) 2005 Manuel Bouyer.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*
*/
/*
* watch "control/shutdown" and generate sysmon events.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: shutdown_xenbus.c,v 1.7 2011/09/20 00:12:24 jym Exp $");
#include <sys/param.h>
#include <sys/malloc.h>
#include <dev/sysmon/sysmonvar.h>
#include <xen/xenbus.h>
#include <xen/shutdown_xenbus.h>
#define SHUTDOWN_PATH "control"
#define SHUTDOWN_NAME "shutdown"
static struct sysmon_pswitch xenbus_power = {
.smpsw_type = PSWITCH_TYPE_POWER,
.smpsw_name = "xenbus",
};
static struct sysmon_pswitch xenbus_reset = {
.smpsw_type = PSWITCH_TYPE_RESET,
.smpsw_name = "xenbus",
};
static struct sysmon_pswitch xenbus_sleep = {
.smpsw_type = PSWITCH_TYPE_SLEEP,
.smpsw_name = "xenbus",
};
static void
xenbus_shutdown_handler(struct xenbus_watch *watch, const char **vec,
unsigned int len)
{
struct xenbus_transaction *xbt;
int error;
char *reqstr;
unsigned int reqstrlen;
again:
xbt = xenbus_transaction_start();
if (xbt == NULL) {
return;
}
error = xenbus_read(xbt, SHUTDOWN_PATH, SHUTDOWN_NAME,
&reqstrlen, &reqstr);
if (error) {
if (error != ENOENT) {
printf("%s: xenbus_read %d\n", __func__, error);
}
error = xenbus_transaction_end(xbt, 1);
if (error != 0) {
printf("%s: xenbus_transaction_end 1 %d\n",
__func__, error);
}
return;
}
KASSERT(strlen(reqstr) == reqstrlen);
error = xenbus_rm(xbt, SHUTDOWN_PATH, SHUTDOWN_NAME);
if (error) {
printf("%s: xenbus_rm %d\n", __func__, error);
}
error = xenbus_transaction_end(xbt, 0);
if (error == EAGAIN) {
free(reqstr, M_DEVBUF);
goto again;
}
if (error != 0) {
printf("%s: xenbus_transaction_end 2 %d\n", __func__, error);
}
if (strcmp(reqstr, "poweroff") == 0) {
sysmon_pswitch_event(&xenbus_power, PSWITCH_EVENT_PRESSED);
} else if (strcmp(reqstr, "halt") == 0) { /* XXX eventually halt without -p */
sysmon_pswitch_event(&xenbus_power, PSWITCH_EVENT_PRESSED);
} else if (strcmp(reqstr, "reboot") == 0) {
sysmon_pswitch_event(&xenbus_reset, PSWITCH_EVENT_PRESSED);
} else if (strcmp(reqstr, "suspend") == 0) {
xen_suspend_allow = true;
sysmon_pswitch_event(&xenbus_sleep, PSWITCH_EVENT_PRESSED);
} else {
printf("ignore shutdown request: %s\n", reqstr);
}
free(reqstr, M_DEVBUF);
}
static struct xenbus_watch xenbus_shutdown_watch = {
.node = __UNCONST(SHUTDOWN_PATH "/" SHUTDOWN_NAME), /* XXX */
.xbw_callback = xenbus_shutdown_handler,
};
void
shutdown_xenbus_setup(void)
{
xen_suspend_allow = false;
if (sysmon_pswitch_register(&xenbus_power) != 0 ||
sysmon_pswitch_register(&xenbus_reset) != 0 ||
sysmon_pswitch_register(&xenbus_sleep) != 0) {
aprint_error("%s: unable to register with sysmon\n", __func__);
return;
}
if (register_xenbus_watch(&xenbus_shutdown_watch)) {
aprint_error("%s: unable to watch control/shutdown\n", __func__);
}
}