1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
/* $OpenBSD: virtioreg.h,v 1.4 2019/03/24 18:21:12 sf Exp $ */
/* $NetBSD: virtioreg.h,v 1.1 2011/10/30 12:12:21 hannken Exp $ */
/*
* Copyright (c) 2012 Stefan Fritsch.
* Copyright (c) 2010 Minoura Makoto.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Part of the file derived from `Virtio PCI Card Specification v0.8.6 DRAFT'
* Appendix A.
*/
/* An interface for efficient virtio implementation.
*
* This header is BSD licensed so anyone can use the definitions
* to implement compatible drivers/servers.
*
* Copyright 2007, 2009, IBM Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of IBM nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _DEV_PV_VIRTIOREG_H_
#define _DEV_PV_VIRTIOREG_H_
#include <sys/types.h>
/* Virtio product id (subsystem) */
#define PCI_PRODUCT_VIRTIO_NETWORK 1
#define PCI_PRODUCT_VIRTIO_BLOCK 2
#define PCI_PRODUCT_VIRTIO_CONSOLE 3
#define PCI_PRODUCT_VIRTIO_ENTROPY 4
#define PCI_PRODUCT_VIRTIO_BALLOON 5
#define PCI_PRODUCT_VIRTIO_IOMEM 6
#define PCI_PRODUCT_VIRTIO_RPMSG 7
#define PCI_PRODUCT_VIRTIO_SCSI 8
#define PCI_PRODUCT_VIRTIO_9P 9
#define PCI_PRODUCT_VIRTIO_MAC80211 10
#define PCI_PRODUCT_VIRTIO_VMMCI 65535 /* private id */
/* device-independent feature bits */
#define VIRTIO_F_NOTIFY_ON_EMPTY (1ULL<<24)
#define VIRTIO_F_RING_INDIRECT_DESC (1ULL<<28)
#define VIRTIO_F_RING_EVENT_IDX (1ULL<<29)
#define VIRTIO_F_BAD_FEATURE (1ULL<<30)
#define VIRTIO_F_VERSION_1 (1ULL<<32)
/* device status bits */
#define VIRTIO_CONFIG_DEVICE_STATUS_RESET 0
#define VIRTIO_CONFIG_DEVICE_STATUS_ACK 1
#define VIRTIO_CONFIG_DEVICE_STATUS_DRIVER 2
#define VIRTIO_CONFIG_DEVICE_STATUS_DRIVER_OK 4
#define VIRTIO_CONFIG_DEVICE_STATUS_FEATURES_OK 8
#define VIRTIO_CONFIG_DEVICE_STATUS_DEVICE_NEEDS_RESET 64
#define VIRTIO_CONFIG_DEVICE_STATUS_FAILED 128
/* Virtqueue */
/* This marks a buffer as continuing via the next field. */
#define VRING_DESC_F_NEXT 1
/* This marks a buffer as write-only (otherwise read-only). */
#define VRING_DESC_F_WRITE 2
/* This means the buffer contains a list of buffer descriptors. */
#define VRING_DESC_F_INDIRECT 4
/* The Host uses this in used->flags to advise the Guest: don't kick me
* when you add a buffer. It's unreliable, so it's simply an
* optimization. Guest will still kick if it's out of buffers. */
#define VRING_USED_F_NO_NOTIFY 1
/* The Guest uses this in avail->flags to advise the Host: don't
* interrupt me when you consume a buffer. It's unreliable, so it's
* simply an optimization. */
#define VRING_AVAIL_F_NO_INTERRUPT 1
/* The standard layout for the ring is a continuous chunk of memory which
* looks like this. We assume num is a power of 2.
*
* struct vring {
* // The actual descriptors (16 bytes each)
* struct vring_desc desc[num];
*
* // A ring of available descriptor heads with free-running index.
* __u16 avail_flags;
* __u16 avail_idx;
* __u16 available[num];
* __u16 used_event_idx
*
* // Padding to the next align boundary.
* char pad[];
*
* // A ring of used descriptor heads with free-running index.
* __u16 used_flags;
* __u16 used_idx;
* struct vring_used_elem used[num];
* __u16 avail_event_idx;
* };
* Note: for virtio PCI, align is 4096.
*/
/* Virtio ring descriptors: 16 bytes.
* These can chain together via "next". */
struct vring_desc {
/* Address (guest-physical). */
uint64_t addr;
/* Length. */
uint32_t len;
/* The flags as indicated above. */
uint16_t flags;
/* We chain unused descriptors via this, too */
uint16_t next;
} __packed;
struct vring_avail {
uint16_t flags;
uint16_t idx;
uint16_t ring[0];
} __packed;
/* u32 is used here for ids for padding reasons. */
struct vring_used_elem {
/* Index of start of used descriptor chain. */
uint32_t id;
/* Total length of the descriptor chain which was written to. */
uint32_t len;
} __packed;
struct vring_used {
uint16_t flags;
uint16_t idx;
struct vring_used_elem ring[0];
} __packed;
/*
* We publish the used event index at the end of the available ring, and vice
* versa. They are at the end for backwards compatibility.
*/
#define VQ_USED_EVENT(vq) (*(uint16_t*)(&(vq)->vq_avail->ring[(vq)->vq_num]))
#define VQ_AVAIL_EVENT(vq) (*(uint16_t*)(&(vq)->vq_used->ring[(vq)->vq_num]))
#define VIRTIO_PAGE_SIZE (4096)
#endif /* _DEV_PV_VIRTIOREG_H_ */
|
