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
|
/*-
* This header is BSD licensed so anyone can use the definitions to implement
* compatible drivers/servers.
*
* 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.
*
* $FreeBSD$
*/
#ifndef _VIRTIO_H_
#define _VIRTIO_H_
struct vq_alloc_info;
/* VirtIO device IDs. */
#define VIRTIO_ID_NETWORK 0x01
#define VIRTIO_ID_BLOCK 0x02
#define VIRTIO_ID_CONSOLE 0x03
#define VIRTIO_ID_ENTROPY 0x04
#define VIRTIO_ID_BALLOON 0x05
#define VIRTIO_ID_IOMEMORY 0x06
#define VIRTIO_ID_SCSI 0x08
#define VIRTIO_ID_9P 0x09
/* Status byte for guest to report progress. */
#define VIRTIO_CONFIG_STATUS_RESET 0x00
#define VIRTIO_CONFIG_STATUS_ACK 0x01
#define VIRTIO_CONFIG_STATUS_DRIVER 0x02
#define VIRTIO_CONFIG_STATUS_DRIVER_OK 0x04
#define VIRTIO_CONFIG_STATUS_FAILED 0x80
/*
* Generate interrupt when the virtqueue ring is
* completely used, even if we've suppressed them.
*/
#define VIRTIO_F_NOTIFY_ON_EMPTY (1 << 24)
/*
* The guest should never negotiate this feature; it
* is used to detect faulty drivers.
*/
#define VIRTIO_F_BAD_FEATURE (1 << 30)
/*
* Some VirtIO feature bits (currently bits 28 through 31) are
* reserved for the transport being used (eg. virtio_ring), the
* rest are per-device feature bits.
*/
#define VIRTIO_TRANSPORT_F_START 28
#define VIRTIO_TRANSPORT_F_END 32
/*
* Each virtqueue indirect descriptor list must be physically contiguous.
* To allow us to malloc(9) each list individually, limit the number
* supported to what will fit in one page. With 4KB pages, this is a limit
* of 256 descriptors. If there is ever a need for more, we can switch to
* contigmalloc(9) for the larger allocations, similar to what
* bus_dmamem_alloc(9) does.
*
* Note the sizeof(struct vring_desc) is 16 bytes.
*/
#define VIRTIO_MAX_INDIRECT ((int) (PAGE_SIZE / 16))
/*
* VirtIO instance variables indices.
*/
#define VIRTIO_IVAR_DEVTYPE 1
#define VIRTIO_IVAR_FEATURE_DESC 2
#define VIRTIO_IVAR_VENDOR 3
#define VIRTIO_IVAR_DEVICE 4
#define VIRTIO_IVAR_SUBVENDOR 5
#define VIRTIO_IVAR_SUBDEVICE 6
struct virtio_feature_desc {
uint64_t vfd_val;
const char *vfd_str;
};
const char *virtio_device_name(uint16_t devid);
void virtio_describe(device_t dev, const char *msg,
uint64_t features, struct virtio_feature_desc *feature_desc);
/*
* VirtIO Bus Methods.
*/
void virtio_read_ivar(device_t dev, int ivar, uintptr_t *val);
void virtio_write_ivar(device_t dev, int ivar, uintptr_t val);
uint64_t virtio_negotiate_features(device_t dev, uint64_t child_features);
int virtio_alloc_virtqueues(device_t dev, int flags, int nvqs,
struct vq_alloc_info *info);
int virtio_setup_intr(device_t dev, enum intr_type type);
int virtio_with_feature(device_t dev, uint64_t feature);
void virtio_stop(device_t dev);
int virtio_reinit(device_t dev, uint64_t features);
void virtio_reinit_complete(device_t dev);
/*
* Read/write a variable amount from the device specific (ie, network)
* configuration region. This region is encoded in the same endian as
* the guest.
*/
void virtio_read_device_config(device_t dev, bus_size_t offset,
void *dst, int length);
void virtio_write_device_config(device_t dev, bus_size_t offset,
void *src, int length);
/* Inlined device specific read/write functions for common lengths. */
#define VIRTIO_RDWR_DEVICE_CONFIG(size, type) \
static inline type \
__CONCAT(virtio_read_dev_config_,size)(device_t dev, \
bus_size_t offset) \
{ \
type val; \
virtio_read_device_config(dev, offset, &val, sizeof(type)); \
return (val); \
} \
\
static inline void \
__CONCAT(virtio_write_dev_config_,size)(device_t dev, \
bus_size_t offset, type val) \
{ \
virtio_write_device_config(dev, offset, &val, sizeof(type)); \
}
VIRTIO_RDWR_DEVICE_CONFIG(1, uint8_t);
VIRTIO_RDWR_DEVICE_CONFIG(2, uint16_t);
VIRTIO_RDWR_DEVICE_CONFIG(4, uint32_t);
#undef VIRTIO_RDWR_DEVICE_CONFIG
#define VIRTIO_READ_IVAR(name, ivar) \
static inline int \
__CONCAT(virtio_get_,name)(device_t dev) \
{ \
uintptr_t val; \
virtio_read_ivar(dev, ivar, &val); \
return ((int) val); \
}
VIRTIO_READ_IVAR(device_type, VIRTIO_IVAR_DEVTYPE);
VIRTIO_READ_IVAR(vendor, VIRTIO_IVAR_VENDOR);
VIRTIO_READ_IVAR(device, VIRTIO_IVAR_DEVICE);
VIRTIO_READ_IVAR(subvendor, VIRTIO_IVAR_SUBVENDOR);
VIRTIO_READ_IVAR(subdevice, VIRTIO_IVAR_SUBDEVICE);
#undef VIRTIO_READ_IVAR
#define VIRTIO_WRITE_IVAR(name, ivar) \
static inline void \
__CONCAT(virtio_set_,name)(device_t dev, void *val) \
{ \
virtio_write_ivar(dev, ivar, (uintptr_t) val); \
}
VIRTIO_WRITE_IVAR(feature_desc, VIRTIO_IVAR_FEATURE_DESC);
#undef VIRTIO_WRITE_IVAR
#endif /* _VIRTIO_H_ */
|
