vmbus_heartbeat.c revision 302698 
1/*-
2 * Copyright (c) 2014,2016 Microsoft Corp.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice unmodified, this list of conditions, and the following
10 *    disclaimer.
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.
14 *
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.
25 *
26 * $FreeBSD: head/sys/dev/hyperv/utilities/hv_heartbeat.c 302698 2016-07-13 05:01:12Z sephe $
27 */
28
29#include <sys/param.h>
30#include <sys/kernel.h>
31#include <sys/bus.h>
32#include <sys/malloc.h>
33#include <sys/module.h>
34#include <sys/timetc.h>
35#include <sys/syscallsubr.h>
36
37#include <dev/hyperv/include/hyperv.h>
38#include "hv_util.h"
39#include "vmbus_if.h"
40
41/* Heartbeat Service */
42static const hv_guid service_guid = { .data =
43	{0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
44	0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d} };
45
46/**
47 * Process heartbeat message
48 */
49static void
50hv_heartbeat_cb(void *context)
51{
52	uint8_t*		buf;
53	hv_vmbus_channel*	channel;
54	uint32_t		recvlen;
55	uint64_t		requestid;
56	int			ret;
57
58	struct hv_vmbus_heartbeat_msg_data*	heartbeat_msg;
59	struct hv_vmbus_icmsg_hdr*		icmsghdrp;
60	hv_util_sc			*softc;
61
62	softc = (hv_util_sc*)context;
63	buf = softc->receive_buffer;
64	channel = softc->hv_dev->channel;
65
66	ret = hv_vmbus_channel_recv_packet(channel, buf, PAGE_SIZE, &recvlen,
67					    &requestid);
68
69	if ((ret == 0) && recvlen > 0) {
70
71	    icmsghdrp = (struct hv_vmbus_icmsg_hdr *)
72		&buf[sizeof(struct hv_vmbus_pipe_hdr)];
73
74	    if (icmsghdrp->icmsgtype == HV_ICMSGTYPE_NEGOTIATE) {
75		hv_negotiate_version(icmsghdrp, NULL, buf);
76
77	    } else {
78		heartbeat_msg =
79		    (struct hv_vmbus_heartbeat_msg_data *)
80			&buf[sizeof(struct hv_vmbus_pipe_hdr) +
81			     sizeof(struct hv_vmbus_icmsg_hdr)];
82
83		heartbeat_msg->seq_num += 1;
84	    }
85
86	    icmsghdrp->icflags = HV_ICMSGHDRFLAG_TRANSACTION |
87				 HV_ICMSGHDRFLAG_RESPONSE;
88
89	    hv_vmbus_channel_send_packet(channel, buf, recvlen, requestid,
90		HV_VMBUS_PACKET_TYPE_DATA_IN_BAND, 0);
91	}
92}
93
94static int
95hv_heartbeat_probe(device_t dev)
96{
97	if (resource_disabled("hvheartbeat", 0))
98		return ENXIO;
99
100	if (VMBUS_PROBE_GUID(device_get_parent(dev), dev, &service_guid) == 0) {
101		device_set_desc(dev, "Hyper-V Heartbeat Service");
102		return BUS_PROBE_DEFAULT;
103	}
104	return ENXIO;
105}
106
107static int
108hv_heartbeat_attach(device_t dev)
109{
110	hv_util_sc *softc = (hv_util_sc*)device_get_softc(dev);
111
112	softc->callback = hv_heartbeat_cb;
113
114	return hv_util_attach(dev);
115}
116
117static device_method_t heartbeat_methods[] = {
118	/* Device interface */
119	DEVMETHOD(device_probe, hv_heartbeat_probe),
120	DEVMETHOD(device_attach, hv_heartbeat_attach),
121	DEVMETHOD(device_detach, hv_util_detach),
122	{ 0, 0 }
123};
124
125static driver_t heartbeat_driver = { "hvheartbeat", heartbeat_methods, sizeof(hv_util_sc)};
126
127static devclass_t heartbeat_devclass;
128
129DRIVER_MODULE(hv_heartbeat, vmbus, heartbeat_driver, heartbeat_devclass, NULL, NULL);
130MODULE_VERSION(hv_heartbeat, 1);
131MODULE_DEPEND(hv_heartbeat, vmbus, 1, 1, 1);
132