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e467cde2 RR |
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 */ |
cd5d5038 | 40 | #define VIRTIO_BLK_F_WCE 9 /* Writeback mode enabled after reset */ |
69740c8b | 41 | #define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */ |
cd5d5038 | 42 | #define VIRTIO_BLK_F_CONFIG_WCE 11 /* Writeback mode available in config */ |
1d589bb1 | 43 | |
6a743897 RR |
44 | #ifndef __KERNEL__ |
45 | /* Old (deprecated) name for VIRTIO_BLK_F_WCE. */ | |
46 | #define VIRTIO_BLK_F_FLUSH VIRTIO_BLK_F_WCE | |
47 | #endif | |
48 | ||
4cb2ea28 | 49 | #define VIRTIO_BLK_ID_BYTES 20 /* ID string length */ |
50 | ||
1842f23c | 51 | struct virtio_blk_config { |
a586d4f6 | 52 | /* The capacity (in 512-byte sectors). */ |
7757f09c | 53 | __u64 capacity; |
a586d4f6 | 54 | /* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */ |
7757f09c | 55 | __u32 size_max; |
a586d4f6 | 56 | /* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */ |
7757f09c | 57 | __u32 seg_max; |
48e4043d RH |
58 | /* geometry the device (if VIRTIO_BLK_F_GEOMETRY) */ |
59 | struct virtio_blk_geometry { | |
7757f09c | 60 | __u16 cylinders; |
48e4043d RH |
61 | __u8 heads; |
62 | __u8 sectors; | |
63 | } geometry; | |
69740c8b | 64 | |
066f4d82 CB |
65 | /* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */ |
66 | __u32 blk_size; | |
69740c8b CH |
67 | |
68 | /* the next 4 entries are guarded by VIRTIO_BLK_F_TOPOLOGY */ | |
69 | /* exponent for physical block per logical block. */ | |
70 | __u8 physical_block_exp; | |
71 | /* alignment offset in logical blocks. */ | |
72 | __u8 alignment_offset; | |
73 | /* minimum I/O size without performance penalty in logical blocks. */ | |
74 | __u16 min_io_size; | |
75 | /* optimal sustained I/O size in logical blocks. */ | |
76 | __u32 opt_io_size; | |
77 | ||
cd5d5038 PB |
78 | /* writeback mode (if VIRTIO_BLK_F_CONFIG_WCE) */ |
79 | __u8 wce; | |
a586d4f6 | 80 | } __attribute__((packed)); |
e467cde2 | 81 | |
f1b0ef06 CH |
82 | /* |
83 | * Command types | |
84 | * | |
85 | * Usage is a bit tricky as some bits are used as flags and some are not. | |
86 | * | |
87 | * Rules: | |
88 | * VIRTIO_BLK_T_OUT may be combined with VIRTIO_BLK_T_SCSI_CMD or | |
89 | * VIRTIO_BLK_T_BARRIER. VIRTIO_BLK_T_FLUSH is a command of its own | |
90 | * and may not be combined with any of the other flags. | |
91 | */ | |
92 | ||
e467cde2 RR |
93 | /* These two define direction. */ |
94 | #define VIRTIO_BLK_T_IN 0 | |
95 | #define VIRTIO_BLK_T_OUT 1 | |
96 | ||
97 | /* This bit says it's a scsi command, not an actual read or write. */ | |
98 | #define VIRTIO_BLK_T_SCSI_CMD 2 | |
99 | ||
f1b0ef06 CH |
100 | /* Cache flush command */ |
101 | #define VIRTIO_BLK_T_FLUSH 4 | |
102 | ||
4cb2ea28 | 103 | /* Get device ID command */ |
104 | #define VIRTIO_BLK_T_GET_ID 8 | |
105 | ||
e467cde2 RR |
106 | /* Barrier before this op. */ |
107 | #define VIRTIO_BLK_T_BARRIER 0x80000000 | |
108 | ||
109 | /* This is the first element of the read scatter-gather list. */ | |
1842f23c | 110 | struct virtio_blk_outhdr { |
e467cde2 RR |
111 | /* VIRTIO_BLK_T* */ |
112 | __u32 type; | |
113 | /* io priority. */ | |
114 | __u32 ioprio; | |
115 | /* Sector (ie. 512 byte offset) */ | |
116 | __u64 sector; | |
e467cde2 RR |
117 | }; |
118 | ||
1cde26f9 HR |
119 | struct virtio_scsi_inhdr { |
120 | __u32 errors; | |
121 | __u32 data_len; | |
122 | __u32 sense_len; | |
123 | __u32 residual; | |
124 | }; | |
125 | ||
cb38fa23 | 126 | /* And this is the final byte of the write scatter-gather list. */ |
e467cde2 RR |
127 | #define VIRTIO_BLK_S_OK 0 |
128 | #define VIRTIO_BLK_S_IOERR 1 | |
129 | #define VIRTIO_BLK_S_UNSUPP 2 | |
e467cde2 | 130 | #endif /* _LINUX_VIRTIO_BLK_H */ |