vmbus_ic.c revision 303822 
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 303822 2016-08-08 05:57:38Z 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 <dev/hyperv/include/vmbus.h>
44#include <dev/hyperv/utilities/hv_utilreg.h>
45#include "hv_util.h"
46
47void
48hv_negotiate_version(struct hv_vmbus_icmsg_hdr *icmsghdrp, uint8_t *buf)
49{
50	struct hv_vmbus_icmsg_negotiate *negop;
51
52	icmsghdrp->icmsgsize = 0x10;
53
54	negop = (struct hv_vmbus_icmsg_negotiate *)&buf[
55		sizeof(struct hv_vmbus_pipe_hdr) +
56		sizeof(struct hv_vmbus_icmsg_hdr)];
57
58	if (negop->icframe_vercnt >= 2 &&
59	    negop->icversion_data[1].major == 3) {
60		negop->icversion_data[0].major = 3;
61		negop->icversion_data[0].minor = 0;
62		negop->icversion_data[1].major = 3;
63		negop->icversion_data[1].minor = 0;
64	} else {
65		negop->icversion_data[0].major = 1;
66		negop->icversion_data[0].minor = 0;
67		negop->icversion_data[1].major = 1;
68		negop->icversion_data[1].minor = 0;
69	}
70
71	negop->icframe_vercnt = 1;
72	negop->icmsg_vercnt = 1;
73}
74
75int
76hv_util_attach(device_t dev)
77{
78	struct hv_util_sc*	softc;
79	struct vmbus_channel *chan;
80	int			ret;
81
82	softc = device_get_softc(dev);
83	softc->receive_buffer =
84		malloc(4 * PAGE_SIZE, M_DEVBUF, M_WAITOK | M_ZERO);
85	chan = vmbus_get_channel(dev);
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	vmbus_chan_set_readbatch(chan, false);
95
96	ret = vmbus_chan_open(chan, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
97	    softc->callback, softc);
98
99	if (ret)
100		goto error0;
101
102	return (0);
103
104error0:
105	free(softc->receive_buffer, M_DEVBUF);
106	return (ret);
107}
108
109int
110hv_util_detach(device_t dev)
111{
112	struct hv_util_sc *sc = device_get_softc(dev);
113
114	vmbus_chan_close(vmbus_get_channel(dev));
115	free(sc->receive_buffer, M_DEVBUF);
116
117	return (0);
118}
119