vmbus_heartbeat.c revision 304730 
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 304730 2016-08-24 04:36:04Z 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#include <sys/systm.h>
37
38#include <dev/hyperv/include/hyperv.h>
39#include <dev/hyperv/include/vmbus.h>
40#include <dev/hyperv/utilities/hv_utilreg.h>
41#include "hv_util.h"
42#include "vmbus_if.h"
43
44static const struct vmbus_ic_desc vmbus_heartbeat_descs[] = {
45	{
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"
50	},
51	VMBUS_IC_DESC_END
52};
53
54/**
55 * Process heartbeat message
56 */
57static void
58hv_heartbeat_cb(struct vmbus_channel *channel, void *context)
59{
60	uint8_t*		buf;
61	int			recvlen;
62	uint64_t		requestid;
63	int			ret;
64
65	struct hv_vmbus_heartbeat_msg_data*	heartbeat_msg;
66	struct hv_vmbus_icmsg_hdr*		icmsghdrp;
67	hv_util_sc			*softc;
68
69	softc = (hv_util_sc*)context;
70	buf = softc->receive_buffer;
71
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 */
76
77	if ((ret == 0) && recvlen > 0) {
78
79	    icmsghdrp = (struct hv_vmbus_icmsg_hdr *)
80		&buf[sizeof(struct hv_vmbus_pipe_hdr)];
81
82	    if (icmsghdrp->icmsgtype == HV_ICMSGTYPE_NEGOTIATE) {
83	    	int error;
84
85		error = vmbus_ic_negomsg(softc, buf, recvlen);
86		if (error)
87			return;
88	    } else {
89		heartbeat_msg =
90		    (struct hv_vmbus_heartbeat_msg_data *)
91			&buf[sizeof(struct hv_vmbus_pipe_hdr) +
92			     sizeof(struct hv_vmbus_icmsg_hdr)];
93
94		heartbeat_msg->seq_num += 1;
95	    }
96
97	    icmsghdrp->icflags = HV_ICMSGHDRFLAG_TRANSACTION |
98				 HV_ICMSGHDRFLAG_RESPONSE;
99
100	    vmbus_chan_send(channel, VMBUS_CHANPKT_TYPE_INBAND, 0,
101	        buf, recvlen, requestid);
102	}
103}
104
105static int
106hv_heartbeat_probe(device_t dev)
107{
108
109	return (vmbus_ic_probe(dev, vmbus_heartbeat_descs));
110}
111
112static int
113hv_heartbeat_attach(device_t dev)
114{
115	return hv_util_attach(dev, hv_heartbeat_cb);
116}
117
118static device_method_t heartbeat_methods[] = {
119	/* Device interface */
120	DEVMETHOD(device_probe, hv_heartbeat_probe),
121	DEVMETHOD(device_attach, hv_heartbeat_attach),
122	DEVMETHOD(device_detach, hv_util_detach),
123	{ 0, 0 }
124};
125
126static driver_t heartbeat_driver = { "hvheartbeat", heartbeat_methods, sizeof(hv_util_sc)};
127
128static devclass_t heartbeat_devclass;
129
130DRIVER_MODULE(hv_heartbeat, vmbus, heartbeat_driver, heartbeat_devclass, NULL, NULL);
131MODULE_VERSION(hv_heartbeat, 1);
132MODULE_DEPEND(hv_heartbeat, vmbus, 1, 1, 1);
133