vmbus_res.c revision 318393 
1/*-
2 * Copyright (c) 2017 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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/10/sys/dev/hyperv/vmbus/vmbus_res.c 318393 2017-05-17 02:40:06Z sephe $");
29
30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/bus.h>
33#include <sys/module.h>
34
35#include <contrib/dev/acpica/include/acpi.h>
36#include <dev/acpica/acpivar.h>
37
38#include <dev/hyperv/include/hyperv.h>
39
40#include "acpi_if.h"
41#include "bus_if.h"
42
43static int		vmbus_res_probe(device_t);
44static int		vmbus_res_attach(device_t);
45static int		vmbus_res_detach(device_t);
46
47static device_method_t vmbus_res_methods[] = {
48	/* Device interface */
49	DEVMETHOD(device_probe,			vmbus_res_probe),
50	DEVMETHOD(device_attach,		vmbus_res_attach),
51	DEVMETHOD(device_detach,		vmbus_res_detach),
52	DEVMETHOD(device_shutdown,		bus_generic_shutdown),
53	DEVMETHOD(device_suspend,		bus_generic_suspend),
54	DEVMETHOD(device_resume,		bus_generic_resume),
55
56	DEVMETHOD_END
57};
58
59static driver_t vmbus_res_driver = {
60	"vmbus_res",
61	vmbus_res_methods,
62	1
63};
64
65static devclass_t vmbus_res_devclass;
66
67DRIVER_MODULE(vmbus_res, acpi, vmbus_res_driver, vmbus_res_devclass,
68    NULL, NULL);
69MODULE_DEPEND(vmbus_res, acpi, 1, 1, 1);
70MODULE_VERSION(vmbus_res, 1);
71
72static int
73vmbus_res_probe(device_t dev)
74{
75	char *id[] = { "VMBUS", NULL };
76
77	if (ACPI_ID_PROBE(device_get_parent(dev), dev, id) == NULL ||
78	    device_get_unit(dev) != 0 || vm_guest != VM_GUEST_HV ||
79	    (hyperv_features & CPUID_HV_MSR_SYNIC) == 0)
80		return (ENXIO);
81
82	device_set_desc(dev, "Hyper-V Vmbus Resource");
83	return (BUS_PROBE_DEFAULT);
84}
85
86static int
87vmbus_res_attach(device_t dev __unused)
88{
89
90	return (0);
91}
92
93static int
94vmbus_res_detach(device_t dev __unused)
95{
96
97	return (0);
98}
99