2 * Copyright (c) 2014,2016 Microsoft Corp.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <sys/param.h>
30 #include <sys/kernel.h>
32 #include <sys/malloc.h>
33 #include <sys/module.h>
34 #include <sys/timetc.h>
35 #include <sys/syscallsubr.h>
36 #include <sys/systm.h>
38 #include <dev/hyperv/include/hyperv.h>
39 #include <dev/hyperv/include/vmbus.h>
40 #include <dev/hyperv/utilities/hv_utilreg.h>
44 static const struct vmbus_ic_desc vmbus_heartbeat_descs[] = {
46 .ic_guid = { .hv_guid = {
47 0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
48 0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d} },
49 .ic_desc = "Hyper-V Heartbeat"
55 * Process heartbeat message
58 hv_heartbeat_cb(struct vmbus_channel *channel, void *context)
65 struct hv_vmbus_heartbeat_msg_data* heartbeat_msg;
66 struct hv_vmbus_icmsg_hdr* icmsghdrp;
69 softc = (hv_util_sc*)context;
70 buf = softc->receive_buffer;;
72 recvlen = softc->ic_buflen;
73 ret = vmbus_chan_recv(channel, buf, &recvlen, &requestid);
74 KASSERT(ret != ENOBUFS, ("hvheartbeat recvbuf is not large enough"));
75 /* XXX check recvlen to make sure that it contains enough data */
77 if ((ret == 0) && recvlen > 0) {
79 icmsghdrp = (struct hv_vmbus_icmsg_hdr *)
80 &buf[sizeof(struct hv_vmbus_pipe_hdr)];
82 if (icmsghdrp->icmsgtype == HV_ICMSGTYPE_NEGOTIATE) {
83 hv_negotiate_version(icmsghdrp, buf);
86 (struct hv_vmbus_heartbeat_msg_data *)
87 &buf[sizeof(struct hv_vmbus_pipe_hdr) +
88 sizeof(struct hv_vmbus_icmsg_hdr)];
90 heartbeat_msg->seq_num += 1;
93 icmsghdrp->icflags = HV_ICMSGHDRFLAG_TRANSACTION |
94 HV_ICMSGHDRFLAG_RESPONSE;
96 vmbus_chan_send(channel, VMBUS_CHANPKT_TYPE_INBAND, 0,
97 buf, recvlen, requestid);
102 hv_heartbeat_probe(device_t dev)
105 return (vmbus_ic_probe(dev, vmbus_heartbeat_descs));
109 hv_heartbeat_attach(device_t dev)
111 return hv_util_attach(dev, hv_heartbeat_cb);
114 static device_method_t heartbeat_methods[] = {
115 /* Device interface */
116 DEVMETHOD(device_probe, hv_heartbeat_probe),
117 DEVMETHOD(device_attach, hv_heartbeat_attach),
118 DEVMETHOD(device_detach, hv_util_detach),
122 static driver_t heartbeat_driver = { "hvheartbeat", heartbeat_methods, sizeof(hv_util_sc)};
124 static devclass_t heartbeat_devclass;
126 DRIVER_MODULE(hv_heartbeat, vmbus, heartbeat_driver, heartbeat_devclass, NULL, NULL);
127 MODULE_VERSION(hv_heartbeat, 1);
128 MODULE_DEPEND(hv_heartbeat, vmbus, 1, 1, 1);