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/* $NetBSD: hvshutdown.c,v 1.2 2019/03/01 08:17:51 nonaka Exp $ */
/*-
* Copyright (c) 2014,2016 Microsoft Corp.
* 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 unmodified, 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.
*/
#include <sys/cdefs.h>
#ifdef __KERNEL_RCSID
__KERNEL_RCSID(0, "$NetBSD: hvshutdown.c,v 1.2 2019/03/01 08:17:51 nonaka Exp $");
#endif
#ifdef __FBSDID
__FBSDID("$FreeBSD: head/sys/dev/hyperv/utilities/vmbus_shutdown.c 310324 2016-12-20 09:46:14Z sephe $");
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/module.h>
#include <sys/pmf.h>
#include <dev/sysmon/sysmonvar.h>
#include <dev/sysmon/sysmon_taskq.h>
#include <dev/hyperv/vmbusvar.h>
#include <dev/hyperv/vmbusicreg.h>
#include <dev/hyperv/vmbusicvar.h>
#define VMBUS_SHUTDOWN_FWVER_MAJOR 3
#define VMBUS_SHUTDOWN_FWVER \
VMBUS_IC_VERSION(VMBUS_SHUTDOWN_FWVER_MAJOR, 0)
#define VMBUS_SHUTDOWN_MSGVER_MAJOR 3
#define VMBUS_SHUTDOWN_MSGVER \
VMBUS_IC_VERSION(VMBUS_SHUTDOWN_MSGVER_MAJOR, 0)
static int hvshutdown_match(device_t, cfdata_t, void *);
static void hvshutdown_attach(device_t, device_t, void *);
static int hvshutdown_detach(device_t, int);
static void hvshutdown_channel_cb(void *);
struct hvshutdown_softc {
struct vmbusic_softc sc_vmbusic;
struct sysmon_pswitch sc_smpsw;
};
CFATTACH_DECL_NEW(hvshutdown, sizeof(struct hvshutdown_softc),
hvshutdown_match, hvshutdown_attach, hvshutdown_detach, NULL);
static int
hvshutdown_match(device_t parent, cfdata_t cf, void *aux)
{
struct vmbus_attach_args *aa = aux;
return vmbusic_probe(aa, &hyperv_guid_shutdown);
}
static void
hvshutdown_attach(device_t parent, device_t self, void *aux)
{
struct hvshutdown_softc *sc = device_private(self);
struct vmbus_attach_args *aa = aux;
int error;
aprint_naive("\n");
aprint_normal(": Hyper-V Guest Shutdown Service\n");
error = vmbusic_attach(self, aa, hvshutdown_channel_cb);
if (error)
return;
(void) pmf_device_register(self, NULL, NULL);
sysmon_task_queue_init();
sc->sc_smpsw.smpsw_name = device_xname(self);
sc->sc_smpsw.smpsw_type = PSWITCH_TYPE_POWER;
(void) sysmon_pswitch_register(&sc->sc_smpsw);
}
static int
hvshutdown_detach(device_t self, int flags)
{
struct hvshutdown_softc *sc = device_private(self);
int error;
error = vmbusic_detach(self, flags);
if (error)
return error;
pmf_device_deregister(self);
sysmon_pswitch_unregister(&sc->sc_smpsw);
return 0;
}
static void
hvshutdown_do_shutdown(void *arg)
{
struct hvshutdown_softc *sc = arg;
sysmon_pswitch_event(&sc->sc_smpsw, PSWITCH_EVENT_PRESSED);
}
static void
hvshutdown_channel_cb(void *arg)
{
struct hvshutdown_softc *sc = arg;
struct vmbusic_softc *vsc = &sc->sc_vmbusic;
struct vmbus_channel *ch = vsc->sc_chan;
struct vmbus_icmsg_hdr *hdr;
struct vmbus_icmsg_shutdown *msg;
uint64_t rid;
uint32_t rlen;
int error;
bool do_shutdown = false;
error = vmbus_channel_recv(ch, vsc->sc_buf, vsc->sc_buflen,
&rlen, &rid, 0);
if (error || rlen == 0) {
if (error != EAGAIN) {
DPRINTF("%s: shutdown error=%d len=%u\n",
device_xname(vsc->sc_dev), error, rlen);
}
return;
}
if (rlen < sizeof(*hdr)) {
DPRINTF("%s: shutdown short read len=%u\n",
device_xname(vsc->sc_dev), rlen);
return;
}
hdr = (struct vmbus_icmsg_hdr *)vsc->sc_buf;
switch (hdr->ic_type) {
case VMBUS_ICMSG_TYPE_NEGOTIATE:
error = vmbusic_negotiate(vsc, hdr, &rlen, VMBUS_SHUTDOWN_FWVER,
VMBUS_SHUTDOWN_MSGVER);
if (error)
return;
break;
case VMBUS_ICMSG_TYPE_SHUTDOWN:
if (rlen < VMBUS_ICMSG_SHUTDOWN_SIZE_MIN) {
DPRINTF("%s: invalid shutdown len=%u\n",
device_xname(vsc->sc_dev), rlen);
return;
}
msg = (struct vmbus_icmsg_shutdown *)hdr;
if (msg->ic_haltflags == 0 || msg->ic_haltflags == 1) {
device_printf(vsc->sc_dev, "shutdown requested\n");
hdr->ic_status = VMBUS_ICMSG_STATUS_OK;
do_shutdown = true;
} else {
device_printf(vsc->sc_dev,
"unknown shutdown flags 0x%08x\n",
msg->ic_haltflags);
hdr->ic_status = VMBUS_ICMSG_STATUS_FAIL;
}
break;
default:
device_printf(vsc->sc_dev,
"unhandled shutdown message type %u\n", hdr->ic_type);
return;
}
(void) vmbusic_sendresp(vsc, ch, vsc->sc_buf, rlen, rid);
if (do_shutdown)
sysmon_task_queue_sched(0, hvshutdown_do_shutdown, sc);
}
MODULE(MODULE_CLASS_DRIVER, hvshutdown, "vmbus");
#ifdef _MODULE
#include "ioconf.c"
#endif
static int
hvshutdown_modcmd(modcmd_t cmd, void *aux)
{
int error = 0;
switch (cmd) {
case MODULE_CMD_INIT:
#ifdef _MODULE
error = config_init_component(cfdriver_ioconf_hvshutdown,
cfattach_ioconf_hvshutdown, cfdata_ioconf_hvshutdown);
#endif
break;
case MODULE_CMD_FINI:
#ifdef _MODULE
error = config_fini_component(cfdriver_ioconf_hvshutdown,
cfattach_ioconf_hvshutdown, cfdata_ioconf_hvshutdown);
#endif
break;
case MODULE_CMD_AUTOUNLOAD:
error = EBUSY;
break;
default:
error = ENOTTY;
break;
}
return error;
}
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