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1 | #ifndef _LINUX_VIRTIO_BLK_H |
2 | #define _LINUX_VIRTIO_BLK_H | |
674bfc23 | 3 | /* This header is BSD licensed so anyone can use the definitions to implement |
a1b38387 RR |
4 | * compatible drivers/servers. |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * 3. Neither the name of IBM nor the names of its contributors | |
15 | * may be used to endorse or promote products derived from this software | |
16 | * without specific prior written permission. | |
17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. */ | |
982f8184 | 28 | #include <linux/types.h> |
e95646c3 | 29 | #include <linux/virtio_ids.h> |
e467cde2 RR |
30 | #include <linux/virtio_config.h> |
31 | ||
e467cde2 | 32 | /* Feature bits */ |
a586d4f6 RR |
33 | #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ |
34 | #define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */ | |
35 | #define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */ | |
48e4043d | 36 | #define VIRTIO_BLK_F_GEOMETRY 4 /* Legacy geometry available */ |
3ef53609 | 37 | #define VIRTIO_BLK_F_RO 5 /* Disk is read-only */ |
066f4d82 | 38 | #define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/ |
1cde26f9 | 39 | #define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */ |
f1b0ef06 | 40 | #define VIRTIO_BLK_F_FLUSH 9 /* Cache flush command support */ |
69740c8b | 41 | #define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */ |
1d589bb1 | 42 | |
4cb2ea28 | 43 | #define VIRTIO_BLK_ID_BYTES 20 /* ID string length */ |
44 | ||
1842f23c | 45 | struct virtio_blk_config { |
a586d4f6 | 46 | /* The capacity (in 512-byte sectors). */ |
7757f09c | 47 | __u64 capacity; |
a586d4f6 | 48 | /* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */ |
7757f09c | 49 | __u32 size_max; |
a586d4f6 | 50 | /* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */ |
7757f09c | 51 | __u32 seg_max; |
48e4043d RH |
52 | /* geometry the device (if VIRTIO_BLK_F_GEOMETRY) */ |
53 | struct virtio_blk_geometry { | |
7757f09c | 54 | __u16 cylinders; |
48e4043d RH |
55 | __u8 heads; |
56 | __u8 sectors; | |
57 | } geometry; | |
69740c8b | 58 | |
066f4d82 CB |
59 | /* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */ |
60 | __u32 blk_size; | |
69740c8b CH |
61 | |
62 | /* the next 4 entries are guarded by VIRTIO_BLK_F_TOPOLOGY */ | |
63 | /* exponent for physical block per logical block. */ | |
64 | __u8 physical_block_exp; | |
65 | /* alignment offset in logical blocks. */ | |
66 | __u8 alignment_offset; | |
67 | /* minimum I/O size without performance penalty in logical blocks. */ | |
68 | __u16 min_io_size; | |
69 | /* optimal sustained I/O size in logical blocks. */ | |
70 | __u32 opt_io_size; | |
71 | ||
a586d4f6 | 72 | } __attribute__((packed)); |
e467cde2 | 73 | |
f1b0ef06 CH |
74 | /* |
75 | * Command types | |
76 | * | |
77 | * Usage is a bit tricky as some bits are used as flags and some are not. | |
78 | * | |
79 | * Rules: | |
80 | * VIRTIO_BLK_T_OUT may be combined with VIRTIO_BLK_T_SCSI_CMD or | |
81 | * VIRTIO_BLK_T_BARRIER. VIRTIO_BLK_T_FLUSH is a command of its own | |
82 | * and may not be combined with any of the other flags. | |
83 | */ | |
84 | ||
e467cde2 RR |
85 | /* These two define direction. */ |
86 | #define VIRTIO_BLK_T_IN 0 | |
87 | #define VIRTIO_BLK_T_OUT 1 | |
88 | ||
89 | /* This bit says it's a scsi command, not an actual read or write. */ | |
90 | #define VIRTIO_BLK_T_SCSI_CMD 2 | |
91 | ||
f1b0ef06 CH |
92 | /* Cache flush command */ |
93 | #define VIRTIO_BLK_T_FLUSH 4 | |
94 | ||
4cb2ea28 | 95 | /* Get device ID command */ |
96 | #define VIRTIO_BLK_T_GET_ID 8 | |
97 | ||
e467cde2 RR |
98 | /* Barrier before this op. */ |
99 | #define VIRTIO_BLK_T_BARRIER 0x80000000 | |
100 | ||
101 | /* This is the first element of the read scatter-gather list. */ | |
1842f23c | 102 | struct virtio_blk_outhdr { |
e467cde2 RR |
103 | /* VIRTIO_BLK_T* */ |
104 | __u32 type; | |
105 | /* io priority. */ | |
106 | __u32 ioprio; | |
107 | /* Sector (ie. 512 byte offset) */ | |
108 | __u64 sector; | |
e467cde2 RR |
109 | }; |
110 | ||
1cde26f9 HR |
111 | struct virtio_scsi_inhdr { |
112 | __u32 errors; | |
113 | __u32 data_len; | |
114 | __u32 sense_len; | |
115 | __u32 residual; | |
116 | }; | |
117 | ||
cb38fa23 | 118 | /* And this is the final byte of the write scatter-gather list. */ |
e467cde2 RR |
119 | #define VIRTIO_BLK_S_OK 0 |
120 | #define VIRTIO_BLK_S_IOERR 1 | |
121 | #define VIRTIO_BLK_S_UNSUPP 2 | |
e467cde2 | 122 | #endif /* _LINUX_VIRTIO_BLK_H */ |