PPC: e500mc: add missing IVORs to bitmap
[qemu.git] / hw / virtio-blk.h
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 #define VIRTIO_BLK_ID_BYTES 20 /* ID string length */
38
39 struct virtio_blk_config
40 {
41 uint64_t capacity;
42 uint32_t size_max;
43 uint32_t seg_max;
44 uint16_t cylinders;
45 uint8_t heads;
46 uint8_t sectors;
47 uint32_t blk_size;
48 uint8_t physical_block_exp;
49 uint8_t alignment_offset;
50 uint16_t min_io_size;
51 uint32_t opt_io_size;
52 } QEMU_PACKED;
53
54 /* These two define direction. */
55 #define VIRTIO_BLK_T_IN 0
56 #define VIRTIO_BLK_T_OUT 1
57
58 /* This bit says it's a scsi command, not an actual read or write. */
59 #define VIRTIO_BLK_T_SCSI_CMD 2
60
61 /* Flush the volatile write cache */
62 #define VIRTIO_BLK_T_FLUSH 4
63
64 /* return the device ID string */
65 #define VIRTIO_BLK_T_GET_ID 8
66
67 /* Barrier before this op. */
68 #define VIRTIO_BLK_T_BARRIER 0x80000000
69
70 /* This is the first element of the read scatter-gather list. */
71 struct virtio_blk_outhdr
72 {
73 /* VIRTIO_BLK_T* */
74 uint32_t type;
75 /* io priority. */
76 uint32_t ioprio;
77 /* Sector (ie. 512 byte offset) */
78 uint64_t sector;
79 };
80
81 #define VIRTIO_BLK_S_OK 0
82 #define VIRTIO_BLK_S_IOERR 1
83 #define VIRTIO_BLK_S_UNSUPP 2
84
85 /* This is the last element of the write scatter-gather list */
86 struct virtio_blk_inhdr
87 {
88 unsigned char status;
89 };
90
91 /* SCSI pass-through header */
92 struct virtio_scsi_inhdr
93 {
94 uint32_t errors;
95 uint32_t data_len;
96 uint32_t sense_len;
97 uint32_t residual;
98 };
99
100 #ifdef __linux__
101 #define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \
102 DEFINE_VIRTIO_COMMON_FEATURES(_state, _field), \
103 DEFINE_PROP_BIT("scsi", _state, _field, VIRTIO_BLK_F_SCSI, true)
104 #else
105 #define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \
106 DEFINE_VIRTIO_COMMON_FEATURES(_state, _field)
107 #endif
108 #endif