1/*-
2 * Copyright (c) 1998 - 2008 S��ren Schmidt <sos@FreeBSD.org>
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, this list of conditions and the following disclaimer,
10 *    without modification, immediately at the beginning of the file.
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 * Copyright (c) 2009-2013 Microsoft Corp.
28 * Copyright (c) 2012 NetApp Inc.
29 * Copyright (c) 2012 Citrix Inc.
30 * All rights reserved.
31 *
32 * Redistribution and use in source and binary forms, with or without
33 * modification, are permitted provided that the following conditions
34 * are met:
35 * 1. Redistributions of source code must retain the above copyright
36 *    notice unmodified, this list of conditions, and the following
37 *    disclaimer.
38 * 2. Redistributions in binary form must reproduce the above copyright
39 *    notice, this list of conditions and the following disclaimer in the
40 *    documentation and/or other materials provided with the distribution.
41 *
42 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
43 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
44 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
45 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
46 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
47 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
48 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
49 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
50 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
51 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
52 */
53
54#include <sys/cdefs.h>
55__FBSDID("$FreeBSD: releng/11.0/sys/dev/hyperv/stordisengage/hv_ata_pci_disengage.c 273577 2014-10-24 06:27:45Z delphij $");
56
57#include <sys/param.h>
58#include <sys/systm.h>
59#include <sys/kernel.h>
60#include <sys/module.h>
61#include <sys/ata.h>
62#include <sys/bus.h>
63#include <sys/conf.h>
64#include <sys/malloc.h>
65#include <sys/sema.h>
66#include <sys/taskqueue.h>
67#include <vm/uma.h>
68#include <machine/stdarg.h>
69#include <machine/resource.h>
70#include <machine/bus.h>
71#include <sys/rman.h>
72#include <dev/pci/pcivar.h>
73#include <dev/pci/pcireg.h>
74#include <dev/ata/ata-all.h>
75#include <dev/ata/ata-pci.h>
76#include <ata_if.h>
77
78/* prototypes */
79static int hv_ata_pci_probe(device_t dev);
80static int hv_ata_pci_attach(device_t dev);
81static int hv_ata_pci_detach(device_t dev);
82
83/*
84 * generic PCI ATA device probe
85 */
86static int
87hv_ata_pci_probe(device_t dev)
88{
89	device_t parent = device_get_parent(dev);
90	int ata_disk_enable;
91
92	ata_disk_enable = 0;
93
94	/*
95	 * Don't probe if not running in a Hyper-V environment
96	 */
97	if (vm_guest != VM_GUEST_HV)
98		return (ENXIO);
99
100	if (device_get_unit(parent) != 0 || device_get_ivars(dev) != 0)
101		return (ENXIO);
102
103	/*
104	 * On Hyper-V the default is to use the enlightened driver for
105	 * IDE disks. However, if the user wishes to use the native
106	 * ATA driver, the environment variable
107	 * hw_ata.disk_enable must be explicitly set to 1.
108	 */
109	if (getenv_int("hw.ata.disk_enable", &ata_disk_enable)) {
110		if (bootverbose)
111			device_printf(dev,
112			    "hw.ata.disk_enable flag is disabling Hyper-V"
113			    " ATA driver support\n");
114			return (ENXIO);
115	}
116
117	device_set_desc(dev, "Hyper-V ATA storage disengage driver");
118
119	return (BUS_PROBE_DEFAULT);
120}
121
122static int
123hv_ata_pci_attach(device_t dev)
124{
125
126	return (0);
127}
128
129static int
130hv_ata_pci_detach(device_t dev)
131{
132
133	return (0);
134}
135
136static device_method_t hv_ata_pci_methods[] = {
137	/* device interface */
138	DEVMETHOD(device_probe,	hv_ata_pci_probe),
139	DEVMETHOD(device_attach,	hv_ata_pci_attach),
140	DEVMETHOD(device_detach,	hv_ata_pci_detach),
141	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
142
143	DEVMETHOD_END
144};
145
146devclass_t hv_ata_pci_devclass;
147
148static driver_t hv_ata_pci_disengage_driver = {
149	"ata",
150	hv_ata_pci_methods,
151	0,
152};
153
154DRIVER_MODULE(atapci_dis, atapci, hv_ata_pci_disengage_driver,
155    hv_ata_pci_devclass, NULL, NULL);
156MODULE_VERSION(atapci_dis, 1);
157MODULE_DEPEND(atapci_dis, ata, 1, 1, 1);
158