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1 | #ifndef _LINUX_VIRTIO_BLK_H |
2 | #define _LINUX_VIRTIO_BLK_H |
3 | /* This header is BSD licensed so anyone can use the definitions to implement |
4 | * compatible drivers/servers. */ |
5 | #include <linux/types.h> |
6 | #include <linux/virtio_ids.h> |
7 | #include <linux/virtio_config.h> |
8 | |
9 | /* Feature bits */ |
10 | #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ |
11 | #define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */ |
12 | #define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */ |
13 | #define VIRTIO_BLK_F_GEOMETRY 4 /* Legacy geometry available */ |
14 | #define VIRTIO_BLK_F_RO 5 /* Disk is read-only */ |
15 | #define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/ |
16 | #define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */ |
17 | #define VIRTIO_BLK_F_FLUSH 9 /* Cache flush command support */ |
18 | #define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */ |
19 | |
20 | struct virtio_blk_config { |
21 | /* The capacity (in 512-byte sectors). */ |
22 | __u64 capacity; |
23 | /* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */ |
24 | __u32 size_max; |
25 | /* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */ |
26 | __u32 seg_max; |
27 | /* geometry the device (if VIRTIO_BLK_F_GEOMETRY) */ |
28 | struct virtio_blk_geometry { |
29 | __u16 cylinders; |
30 | __u8 heads; |
31 | __u8 sectors; |
32 | } geometry; |
33 | |
34 | /* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */ |
35 | __u32 blk_size; |
36 | |
37 | /* the next 4 entries are guarded by VIRTIO_BLK_F_TOPOLOGY */ |
38 | /* exponent for physical block per logical block. */ |
39 | __u8 physical_block_exp; |
40 | /* alignment offset in logical blocks. */ |
41 | __u8 alignment_offset; |
42 | /* minimum I/O size without performance penalty in logical blocks. */ |
43 | __u16 min_io_size; |
44 | /* optimal sustained I/O size in logical blocks. */ |
45 | __u32 opt_io_size; |
46 | |
47 | } __attribute__((packed)); |
48 | |
49 | /* |
50 | * Command types |
51 | * |
52 | * Usage is a bit tricky as some bits are used as flags and some are not. |
53 | * |
54 | * Rules: |
55 | * VIRTIO_BLK_T_OUT may be combined with VIRTIO_BLK_T_SCSI_CMD or |
56 | * VIRTIO_BLK_T_BARRIER. VIRTIO_BLK_T_FLUSH is a command of its own |
57 | * and may not be combined with any of the other flags. |
58 | */ |
59 | |
60 | /* These two define direction. */ |
61 | #define VIRTIO_BLK_T_IN 0 |
62 | #define VIRTIO_BLK_T_OUT 1 |
63 | |
64 | /* This bit says it's a scsi command, not an actual read or write. */ |
65 | #define VIRTIO_BLK_T_SCSI_CMD 2 |
66 | |
67 | /* Cache flush command */ |
68 | #define VIRTIO_BLK_T_FLUSH 4 |
69 | |
70 | /* Barrier before this op. */ |
71 | #define VIRTIO_BLK_T_BARRIER 0x80000000 |
72 | |
73 | /* This is the first element of the read scatter-gather list. */ |
74 | struct virtio_blk_outhdr { |
75 | /* VIRTIO_BLK_T* */ |
76 | __u32 type; |
77 | /* io priority. */ |
78 | __u32 ioprio; |
79 | /* Sector (ie. 512 byte offset) */ |
80 | __u64 sector; |
81 | }; |
82 | |
83 | struct virtio_scsi_inhdr { |
84 | __u32 errors; |
85 | __u32 data_len; |
86 | __u32 sense_len; |
87 | __u32 residual; |
88 | }; |
89 | |
90 | /* And this is the final byte of the write scatter-gather list. */ |
91 | #define VIRTIO_BLK_S_OK 0 |
92 | #define VIRTIO_BLK_S_IOERR 1 |
93 | #define VIRTIO_BLK_S_UNSUPP 2 |
94 | #endif /* _LINUX_VIRTIO_BLK_H */ |
95 |
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