c72fc9d2b9
MFC after: 1 week Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D7627
142 lines
4.0 KiB
C
142 lines
4.0 KiB
C
/*-
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* Copyright (c) 2014,2016 Microsoft Corp.
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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 unmodified, this list of conditions, and the following
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/systm.h>
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#include <dev/hyperv/include/hyperv.h>
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#include <dev/hyperv/include/vmbus.h>
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#include <dev/hyperv/utilities/hv_util.h>
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#include <dev/hyperv/utilities/vmbus_icreg.h>
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#include "vmbus_if.h"
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static const struct vmbus_ic_desc vmbus_heartbeat_descs[] = {
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{
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.ic_guid = { .hv_guid = {
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0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
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0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d} },
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.ic_desc = "Hyper-V Heartbeat"
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},
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VMBUS_IC_DESC_END
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};
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static void
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vmbus_heartbeat_cb(struct vmbus_channel *chan, void *xsc)
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{
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struct hv_util_sc *sc = xsc;
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struct vmbus_icmsg_hdr *hdr;
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int dlen, error;
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uint64_t xactid;
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void *data;
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/*
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* Receive request.
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*/
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data = sc->receive_buffer;
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dlen = sc->ic_buflen;
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error = vmbus_chan_recv(chan, data, &dlen, &xactid);
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KASSERT(error != ENOBUFS, ("icbuf is not large enough"));
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if (error)
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return;
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if (dlen < sizeof(struct vmbus_icmsg_hdr)) {
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device_printf(sc->ic_dev, "invalid data len %d\n", dlen);
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return;
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}
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hdr = data;
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/*
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* Update request, which will be echoed back as response.
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*/
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switch (hdr->ic_type) {
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case VMBUS_ICMSG_TYPE_NEGOTIATE:
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error = vmbus_ic_negomsg(sc, data, &dlen);
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if (error)
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return;
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break;
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case VMBUS_ICMSG_TYPE_HEARTBEAT:
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/* Only ic_seq is a must */
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if (dlen < VMBUS_ICMSG_HEARTBEAT_SIZE_MIN) {
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device_printf(sc->ic_dev, "invalid heartbeat len %d\n",
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dlen);
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return;
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}
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((struct vmbus_icmsg_heartbeat *)data)->ic_seq++;
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break;
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default:
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device_printf(sc->ic_dev, "got 0x%08x icmsg\n", hdr->ic_type);
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break;
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}
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/*
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* Send response by echoing the updated request back.
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*/
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hdr->ic_flags = VMBUS_ICMSG_FLAG_XACT | VMBUS_ICMSG_FLAG_RESP;
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error = vmbus_chan_send(chan, VMBUS_CHANPKT_TYPE_INBAND, 0,
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data, dlen, xactid);
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if (error)
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device_printf(sc->ic_dev, "resp send failed: %d\n", error);
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}
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static int
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hv_heartbeat_probe(device_t dev)
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{
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return (vmbus_ic_probe(dev, vmbus_heartbeat_descs));
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}
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static int
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hv_heartbeat_attach(device_t dev)
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{
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return (hv_util_attach(dev, vmbus_heartbeat_cb));
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}
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static device_method_t heartbeat_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, hv_heartbeat_probe),
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DEVMETHOD(device_attach, hv_heartbeat_attach),
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DEVMETHOD(device_detach, hv_util_detach),
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{ 0, 0 }
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};
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static driver_t heartbeat_driver = { "hvheartbeat", heartbeat_methods, sizeof(hv_util_sc)};
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static devclass_t heartbeat_devclass;
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DRIVER_MODULE(hv_heartbeat, vmbus, heartbeat_driver, heartbeat_devclass, NULL, NULL);
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MODULE_VERSION(hv_heartbeat, 1);
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MODULE_DEPEND(hv_heartbeat, vmbus, 1, 1, 1);
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