root / hw / virtio-blk.h @ 03f1c143
History | View | Annotate | Download (2.8 kB)
1 |
/*
|
---|---|
2 |
* Virtio Block Device
|
3 |
*
|
4 |
* Copyright IBM, Corp. 2007
|
5 |
*
|
6 |
* Authors:
|
7 |
* Anthony Liguori <aliguori@us.ibm.com>
|
8 |
*
|
9 |
* This work is licensed under the terms of the GNU GPL, version 2. See
|
10 |
* the COPYING file in the top-level directory.
|
11 |
*
|
12 |
*/
|
13 |
|
14 |
#ifndef _QEMU_VIRTIO_BLK_H
|
15 |
#define _QEMU_VIRTIO_BLK_H
|
16 |
|
17 |
#include "virtio.h" |
18 |
#include "block.h" |
19 |
|
20 |
/* from Linux's linux/virtio_blk.h */
|
21 |
|
22 |
/* The ID for virtio_block */
|
23 |
#define VIRTIO_ID_BLOCK 2 |
24 |
|
25 |
/* Feature bits */
|
26 |
#define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ |
27 |
#define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */ |
28 |
#define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */ |
29 |
#define VIRTIO_BLK_F_GEOMETRY 4 /* Indicates support of legacy geometry */ |
30 |
#define VIRTIO_BLK_F_RO 5 /* Disk is read-only */ |
31 |
#define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/ |
32 |
#define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */ |
33 |
/* #define VIRTIO_BLK_F_IDENTIFY 8 ATA IDENTIFY supported, DEPRECATED */
|
34 |
#define VIRTIO_BLK_F_WCACHE 9 /* write cache enabled */ |
35 |
#define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */ |
36 |
|
37 |
struct virtio_blk_config
|
38 |
{ |
39 |
uint64_t capacity; |
40 |
uint32_t size_max; |
41 |
uint32_t seg_max; |
42 |
uint16_t cylinders; |
43 |
uint8_t heads; |
44 |
uint8_t sectors; |
45 |
uint32_t blk_size; |
46 |
uint8_t physical_block_exp; |
47 |
uint8_t alignment_offset; |
48 |
uint16_t min_io_size; |
49 |
uint32_t opt_io_size; |
50 |
} __attribute__((packed)); |
51 |
|
52 |
/* These two define direction. */
|
53 |
#define VIRTIO_BLK_T_IN 0 |
54 |
#define VIRTIO_BLK_T_OUT 1 |
55 |
|
56 |
/* This bit says it's a scsi command, not an actual read or write. */
|
57 |
#define VIRTIO_BLK_T_SCSI_CMD 2 |
58 |
|
59 |
/* Flush the volatile write cache */
|
60 |
#define VIRTIO_BLK_T_FLUSH 4 |
61 |
|
62 |
/* return the device ID string */
|
63 |
#define VIRTIO_BLK_T_GET_ID 8 |
64 |
|
65 |
/* Barrier before this op. */
|
66 |
#define VIRTIO_BLK_T_BARRIER 0x80000000 |
67 |
|
68 |
/* This is the first element of the read scatter-gather list. */
|
69 |
struct virtio_blk_outhdr
|
70 |
{ |
71 |
/* VIRTIO_BLK_T* */
|
72 |
uint32_t type; |
73 |
/* io priority. */
|
74 |
uint32_t ioprio; |
75 |
/* Sector (ie. 512 byte offset) */
|
76 |
uint64_t sector; |
77 |
}; |
78 |
|
79 |
#define VIRTIO_BLK_S_OK 0 |
80 |
#define VIRTIO_BLK_S_IOERR 1 |
81 |
#define VIRTIO_BLK_S_UNSUPP 2 |
82 |
|
83 |
/* This is the last element of the write scatter-gather list */
|
84 |
struct virtio_blk_inhdr
|
85 |
{ |
86 |
unsigned char status; |
87 |
}; |
88 |
|
89 |
/* SCSI pass-through header */
|
90 |
struct virtio_scsi_inhdr
|
91 |
{ |
92 |
uint32_t errors; |
93 |
uint32_t data_len; |
94 |
uint32_t sense_len; |
95 |
uint32_t residual; |
96 |
}; |
97 |
|
98 |
#ifdef __linux__
|
99 |
#define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \
|
100 |
DEFINE_VIRTIO_COMMON_FEATURES(_state, _field), \ |
101 |
DEFINE_PROP_BIT("scsi", _state, _field, VIRTIO_BLK_F_SCSI, true) |
102 |
#else
|
103 |
#define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \
|
104 |
DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) |
105 |
#endif
|
106 |
#endif
|