vmbus_ic.c revision 298446 
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_util.c 298446 2016-04-22 05:01:43Z sephe $
27 */
28
29/*
30 * A common driver for all hyper-V util services.
31 */
32
33#include <sys/param.h>
34#include <sys/kernel.h>
35#include <sys/bus.h>
36#include <sys/malloc.h>
37#include <sys/module.h>
38#include <sys/reboot.h>
39#include <sys/timetc.h>
40#include <sys/syscallsubr.h>
41
42#include <dev/hyperv/include/hyperv.h>
43#include "hv_util.h"
44
45void
46hv_negotiate_version(
47	struct hv_vmbus_icmsg_hdr*		icmsghdrp,
48	struct hv_vmbus_icmsg_negotiate*	negop,
49	uint8_t*				buf)
50{
51	icmsghdrp->icmsgsize = 0x10;
52
53	negop = (struct hv_vmbus_icmsg_negotiate *)&buf[
54		sizeof(struct hv_vmbus_pipe_hdr) +
55		sizeof(struct hv_vmbus_icmsg_hdr)];
56
57	if (negop->icframe_vercnt >= 2 &&
58	    negop->icversion_data[1].major == 3) {
59		negop->icversion_data[0].major = 3;
60		negop->icversion_data[0].minor = 0;
61		negop->icversion_data[1].major = 3;
62		negop->icversion_data[1].minor = 0;
63	} else {
64		negop->icversion_data[0].major = 1;
65		negop->icversion_data[0].minor = 0;
66		negop->icversion_data[1].major = 1;
67		negop->icversion_data[1].minor = 0;
68	}
69
70	negop->icframe_vercnt = 1;
71	negop->icmsg_vercnt = 1;
72}
73
74int
75hv_util_attach(device_t dev)
76{
77	struct hv_device*	hv_dev;
78	struct hv_util_sc*	softc;
79	int			ret;
80
81	hv_dev = vmbus_get_devctx(dev);
82	softc = device_get_softc(dev);
83	softc->hv_dev = hv_dev;
84	softc->receive_buffer =
85		malloc(4 * PAGE_SIZE, M_DEVBUF, M_WAITOK | M_ZERO);
86
87	/*
88	 * These services are not performance critical and do not need
89	 * batched reading. Furthermore, some services such as KVP can
90	 * only handle one message from the host at a time.
91	 * Turn off batched reading for all util drivers before we open the
92	 * channel.
93	 */
94	hv_set_channel_read_state(hv_dev->channel, FALSE);
95
96	ret = hv_vmbus_channel_open(hv_dev->channel, 4 * PAGE_SIZE,
97			4 * PAGE_SIZE, NULL, 0,
98			softc->callback, softc);
99
100	if (ret)
101		goto error0;
102
103	return (0);
104
105error0:
106	free(softc->receive_buffer, M_DEVBUF);
107	return (ret);
108}
109
110int
111hv_util_detach(device_t dev)
112{
113	struct hv_device*	hv_dev;
114	struct hv_util_sc*	softc;
115
116	hv_dev = vmbus_get_devctx(dev);
117
118	hv_vmbus_channel_close(hv_dev->channel);
119	softc = device_get_softc(dev);
120
121	free(softc->receive_buffer, M_DEVBUF);
122	return (0);
123}
124