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/*-
* 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>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/systm.h>
#include <dev/hyperv/include/hyperv.h>
#include <dev/hyperv/include/vmbus.h>
#include <dev/hyperv/utilities/hv_util.h>
#include <dev/hyperv/utilities/vmbus_icreg.h>
#include "vmbus_if.h"
static const struct vmbus_ic_desc vmbus_heartbeat_descs[] = {
{
.ic_guid = { .hv_guid = {
0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d} },
.ic_desc = "Hyper-V Heartbeat"
},
VMBUS_IC_DESC_END
};
static void
vmbus_heartbeat_cb(struct vmbus_channel *chan, void *xsc)
{
struct hv_util_sc *sc = xsc;
struct vmbus_icmsg_hdr *hdr;
int dlen, error;
uint64_t xactid;
void *data;
/*
* Receive request.
*/
data = sc->receive_buffer;
dlen = sc->ic_buflen;
error = vmbus_chan_recv(chan, data, &dlen, &xactid);
KASSERT(error != ENOBUFS, ("icbuf is not large enough"));
if (error)
return;
if (dlen < sizeof(struct vmbus_icmsg_hdr)) {
device_printf(sc->ic_dev, "invalid data len %d\n", dlen);
return;
}
hdr = data;
/*
* Update request, which will be echoed back as response.
*/
switch (hdr->ic_type) {
case VMBUS_ICMSG_TYPE_NEGOTIATE:
error = vmbus_ic_negomsg(sc, data, &dlen);
if (error)
return;
break;
case VMBUS_ICMSG_TYPE_HEARTBEAT:
/* Only ic_seq is a must */
if (dlen < VMBUS_ICMSG_HEARTBEAT_SIZE_MIN) {
device_printf(sc->ic_dev, "invalid heartbeat len %d\n",
dlen);
return;
}
((struct vmbus_icmsg_heartbeat *)data)->ic_seq++;
break;
default:
device_printf(sc->ic_dev, "got 0x%08x icmsg\n", hdr->ic_type);
break;
}
/*
* Send response by echoing the updated request back.
*/
hdr->ic_flags = VMBUS_ICMSG_FLAG_XACT | VMBUS_ICMSG_FLAG_RESP;
error = vmbus_chan_send(chan, VMBUS_CHANPKT_TYPE_INBAND, 0,
data, dlen, xactid);
if (error)
device_printf(sc->ic_dev, "resp send failed: %d\n", error);
}
static int
hv_heartbeat_probe(device_t dev)
{
return (vmbus_ic_probe(dev, vmbus_heartbeat_descs));
}
static int
hv_heartbeat_attach(device_t dev)
{
return (hv_util_attach(dev, vmbus_heartbeat_cb));
}
static device_method_t heartbeat_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, hv_heartbeat_probe),
DEVMETHOD(device_attach, hv_heartbeat_attach),
DEVMETHOD(device_detach, hv_util_detach),
{ 0, 0 }
};
static driver_t heartbeat_driver = { "hvheartbeat", heartbeat_methods, sizeof(hv_util_sc)};
static devclass_t heartbeat_devclass;
DRIVER_MODULE(hv_heartbeat, vmbus, heartbeat_driver, heartbeat_devclass, NULL, NULL);
MODULE_VERSION(hv_heartbeat, 1);
MODULE_DEPEND(hv_heartbeat, vmbus, 1, 1, 1);
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