projects / qemu.git / blame
| Commit | Line | Data |
|---|---|---|
| 6e02c38d AL |
1 | /* |
| 2 | * Virtio Block Device | |
| 3 | * | |
| 4 | * Copyright IBM, Corp. 2007 | |
| 5 | * | |
| 6 | * Authors: | |
| 7 | * Anthony Liguori <[email protected]> | |
| 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" | |
| 6e02c38d AL |
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 */ | |
| 1063b8b1 CH |
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 */ | |
| 37d5ddd6 | 33 | /* #define VIRTIO_BLK_F_IDENTIFY 8 ATA IDENTIFY supported, DEPRECATED */ |
| aa659be3 | 34 | #define VIRTIO_BLK_F_WCACHE 9 /* write cache enabled */ |
| 9752c371 | 35 | #define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */ |
| bf011293 | 36 | |
| 6e02c38d AL |
37 | struct virtio_blk_config |
| 38 | { | |
| 39 | uint64_t capacity; | |
| 40 | uint32_t size_max; | |
| 41 | uint32_t seg_max; | |
| 42 | uint16_t cylinders; | |
| 43 | uint8_t heads; | |
| 44 | uint8_t sectors; | |
| bf011293 | 45 | uint32_t _blk_size; /* structure pad, currently unused */ |
| 9752c371 CH |
46 | uint8_t physical_block_exp; |
| 47 | uint8_t alignment_offset; | |
| 48 | uint16_t min_io_size; | |
| 49 | uint32_t opt_io_size; | |
| 6e02c38d AL |
50 | } __attribute__((packed)); |
| 51 | ||
| 52 | /* These two define direction. */ | |
| 53 | #define VIRTIO_BLK_T_IN 0 | |
| 54 | #define VIRTIO_BLK_T_OUT 1 | |
| 55 | ||
| 56 | /* This bit says it's a scsi command, not an actual read or write. */ | |
| 57 | #define VIRTIO_BLK_T_SCSI_CMD 2 | |
| 58 | ||
| aa659be3 CH |
59 | /* Flush the volatile write cache */ |
| 60 | #define VIRTIO_BLK_T_FLUSH 4 | |
| 61 | ||
| 6e02c38d AL |
62 | /* Barrier before this op. */ |
| 63 | #define VIRTIO_BLK_T_BARRIER 0x80000000 | |
| 64 | ||
| 65 | /* This is the first element of the read scatter-gather list. */ | |
| 66 | struct virtio_blk_outhdr | |
| 67 | { | |
| 68 | /* VIRTIO_BLK_T* */ | |
| 69 | uint32_t type; | |
| 70 | /* io priority. */ | |
| 71 | uint32_t ioprio; | |
| 72 | /* Sector (ie. 512 byte offset) */ | |
| 73 | uint64_t sector; | |
| 74 | }; | |
| 75 | ||
| 76 | #define VIRTIO_BLK_S_OK 0 | |
| 77 | #define VIRTIO_BLK_S_IOERR 1 | |
| 78 | #define VIRTIO_BLK_S_UNSUPP 2 | |
| 79 | ||
| 8b91408b | 80 | /* This is the last element of the write scatter-gather list */ |
| 6e02c38d AL |
81 | struct virtio_blk_inhdr |
| 82 | { | |
| 83 | unsigned char status; | |
| 84 | }; | |
| 85 | ||
| 1063b8b1 CH |
86 | /* SCSI pass-through header */ |
| 87 | struct virtio_scsi_inhdr | |
| 88 | { | |
| 89 | uint32_t errors; | |
| 90 | uint32_t data_len; | |
| 91 | uint32_t sense_len; | |
| 92 | uint32_t residual; | |
| 93 | }; | |
| 94 | ||
| 8172539d MT |
95 | #ifdef __linux__ |
| 96 | #define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \ | |
| 97 | DEFINE_VIRTIO_COMMON_FEATURES(_state, _field), \ | |
| 98 | DEFINE_PROP_BIT("scsi", _state, _field, VIRTIO_BLK_F_SCSI, true) | |
| 99 | #else | |
| 100 | #define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \ | |
| 101 | DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) | |
| 102 | #endif | |
| 6e02c38d | 103 | #endif |