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1 | 6e02c38d | aliguori | /*
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2 | 6e02c38d | aliguori | * Virtio Block Device
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3 | 6e02c38d | aliguori | *
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4 | 6e02c38d | aliguori | * Copyright IBM, Corp. 2007
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5 | 6e02c38d | aliguori | *
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6 | 6e02c38d | aliguori | * Authors:
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7 | 6e02c38d | aliguori | * Anthony Liguori <aliguori@us.ibm.com>
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8 | 6e02c38d | aliguori | *
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9 | 6e02c38d | aliguori | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | 6e02c38d | aliguori | * the COPYING file in the top-level directory.
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11 | 6e02c38d | aliguori | *
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12 | 6e02c38d | aliguori | */
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13 | 6e02c38d | aliguori | |
14 | 6e02c38d | aliguori | #ifndef _QEMU_VIRTIO_BLK_H
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15 | 6e02c38d | aliguori | #define _QEMU_VIRTIO_BLK_H
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16 | 6e02c38d | aliguori | |
17 | 6e02c38d | aliguori | #include "virtio.h" |
18 | 6e02c38d | aliguori | #include "block.h" |
19 | 6e02c38d | aliguori | |
20 | 6e02c38d | aliguori | /* from Linux's linux/virtio_blk.h */
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21 | 6e02c38d | aliguori | |
22 | 6e02c38d | aliguori | /* The ID for virtio_block */
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23 | 6e02c38d | aliguori | #define VIRTIO_ID_BLOCK 2 |
24 | 6e02c38d | aliguori | |
25 | 6e02c38d | aliguori | /* Feature bits */
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26 | 6e02c38d | aliguori | #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ |
27 | 6e02c38d | aliguori | #define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */ |
28 | 6e02c38d | aliguori | #define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */ |
29 | 6e02c38d | aliguori | #define VIRTIO_BLK_F_GEOMETRY 4 /* Indicates support of legacy geometry */ |
30 | 1063b8b1 | Christoph Hellwig | #define VIRTIO_BLK_F_RO 5 /* Disk is read-only */ |
31 | 1063b8b1 | Christoph Hellwig | #define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/ |
32 | 1063b8b1 | Christoph Hellwig | #define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */ |
33 | 37d5ddd6 | hch@lst.de | /* #define VIRTIO_BLK_F_IDENTIFY 8 ATA IDENTIFY supported, DEPRECATED */
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34 | aa659be3 | Christoph Hellwig | #define VIRTIO_BLK_F_WCACHE 9 /* write cache enabled */ |
35 | 9752c371 | Christoph Hellwig | #define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */ |
36 | bf011293 | john cooper | |
37 | 6e02c38d | aliguori | struct virtio_blk_config
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38 | 6e02c38d | aliguori | { |
39 | 6e02c38d | aliguori | uint64_t capacity; |
40 | 6e02c38d | aliguori | uint32_t size_max; |
41 | 6e02c38d | aliguori | uint32_t seg_max; |
42 | 6e02c38d | aliguori | uint16_t cylinders; |
43 | 6e02c38d | aliguori | uint8_t heads; |
44 | 6e02c38d | aliguori | uint8_t sectors; |
45 | 8cfacf07 | Christoph Hellwig | uint32_t blk_size; |
46 | 9752c371 | Christoph Hellwig | uint8_t physical_block_exp; |
47 | 9752c371 | Christoph Hellwig | uint8_t alignment_offset; |
48 | 9752c371 | Christoph Hellwig | uint16_t min_io_size; |
49 | 9752c371 | Christoph Hellwig | uint32_t opt_io_size; |
50 | 6e02c38d | aliguori | } __attribute__((packed)); |
51 | 6e02c38d | aliguori | |
52 | 6e02c38d | aliguori | /* These two define direction. */
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53 | 6e02c38d | aliguori | #define VIRTIO_BLK_T_IN 0 |
54 | 6e02c38d | aliguori | #define VIRTIO_BLK_T_OUT 1 |
55 | 6e02c38d | aliguori | |
56 | 6e02c38d | aliguori | /* This bit says it's a scsi command, not an actual read or write. */
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57 | 6e02c38d | aliguori | #define VIRTIO_BLK_T_SCSI_CMD 2 |
58 | 6e02c38d | aliguori | |
59 | aa659be3 | Christoph Hellwig | /* Flush the volatile write cache */
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60 | aa659be3 | Christoph Hellwig | #define VIRTIO_BLK_T_FLUSH 4 |
61 | aa659be3 | Christoph Hellwig | |
62 | 2930b313 | john cooper | /* return the device ID string */
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63 | 2930b313 | john cooper | #define VIRTIO_BLK_T_GET_ID 8 |
64 | 2930b313 | john cooper | |
65 | 6e02c38d | aliguori | /* Barrier before this op. */
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66 | 6e02c38d | aliguori | #define VIRTIO_BLK_T_BARRIER 0x80000000 |
67 | 6e02c38d | aliguori | |
68 | 6e02c38d | aliguori | /* This is the first element of the read scatter-gather list. */
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69 | 6e02c38d | aliguori | struct virtio_blk_outhdr
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70 | 6e02c38d | aliguori | { |
71 | 6e02c38d | aliguori | /* VIRTIO_BLK_T* */
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72 | 6e02c38d | aliguori | uint32_t type; |
73 | 6e02c38d | aliguori | /* io priority. */
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74 | 6e02c38d | aliguori | uint32_t ioprio; |
75 | 6e02c38d | aliguori | /* Sector (ie. 512 byte offset) */
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76 | 6e02c38d | aliguori | uint64_t sector; |
77 | 6e02c38d | aliguori | }; |
78 | 6e02c38d | aliguori | |
79 | 6e02c38d | aliguori | #define VIRTIO_BLK_S_OK 0 |
80 | 6e02c38d | aliguori | #define VIRTIO_BLK_S_IOERR 1 |
81 | 6e02c38d | aliguori | #define VIRTIO_BLK_S_UNSUPP 2 |
82 | 6e02c38d | aliguori | |
83 | 8b91408b | Christoph Hellwig | /* This is the last element of the write scatter-gather list */
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84 | 6e02c38d | aliguori | struct virtio_blk_inhdr
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85 | 6e02c38d | aliguori | { |
86 | 6e02c38d | aliguori | unsigned char status; |
87 | 6e02c38d | aliguori | }; |
88 | 6e02c38d | aliguori | |
89 | 1063b8b1 | Christoph Hellwig | /* SCSI pass-through header */
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90 | 1063b8b1 | Christoph Hellwig | struct virtio_scsi_inhdr
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91 | 1063b8b1 | Christoph Hellwig | { |
92 | 1063b8b1 | Christoph Hellwig | uint32_t errors; |
93 | 1063b8b1 | Christoph Hellwig | uint32_t data_len; |
94 | 1063b8b1 | Christoph Hellwig | uint32_t sense_len; |
95 | 1063b8b1 | Christoph Hellwig | uint32_t residual; |
96 | 1063b8b1 | Christoph Hellwig | }; |
97 | 1063b8b1 | Christoph Hellwig | |
98 | 8172539d | Michael S. Tsirkin | #ifdef __linux__
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99 | 8172539d | Michael S. Tsirkin | #define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \
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100 | 8172539d | Michael S. Tsirkin | DEFINE_VIRTIO_COMMON_FEATURES(_state, _field), \ |
101 | 8172539d | Michael S. Tsirkin | DEFINE_PROP_BIT("scsi", _state, _field, VIRTIO_BLK_F_SCSI, true) |
102 | 8172539d | Michael S. Tsirkin | #else
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103 | 8172539d | Michael S. Tsirkin | #define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \
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104 | 8172539d | Michael S. Tsirkin | DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) |
105 | 8172539d | Michael S. Tsirkin | #endif
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106 | 6e02c38d | aliguori | #endif |