1 /* 2 * Virtio Block Device 3 * 4 * Copyright IBM, Corp. 2007 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 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 "hw/virtio/virtio.h" 18 #include "hw/block/block.h" 19 20 #define TYPE_VIRTIO_BLK "virtio-blk-device" 21 #define VIRTIO_BLK(obj) \ 22 OBJECT_CHECK(VirtIOBlock, (obj), TYPE_VIRTIO_BLK) 23 24 /* from Linux's linux/virtio_blk.h */ 25 26 /* The ID for virtio_block */ 27 #define VIRTIO_ID_BLOCK 2 28 29 /* Feature bits */ 30 #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ 31 #define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */ 32 #define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */ 33 #define VIRTIO_BLK_F_GEOMETRY 4 /* Indicates support of legacy geometry */ 34 #define VIRTIO_BLK_F_RO 5 /* Disk is read-only */ 35 #define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/ 36 #define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */ 37 /* #define VIRTIO_BLK_F_IDENTIFY 8 ATA IDENTIFY supported, DEPRECATED */ 38 #define VIRTIO_BLK_F_WCE 9 /* write cache enabled */ 39 #define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */ 40 #define VIRTIO_BLK_F_CONFIG_WCE 11 /* write cache configurable */ 41 42 #define VIRTIO_BLK_ID_BYTES 20 /* ID string length */ 43 44 struct virtio_blk_config 45 { 46 uint64_t capacity; 47 uint32_t size_max; 48 uint32_t seg_max; 49 uint16_t cylinders; 50 uint8_t heads; 51 uint8_t sectors; 52 uint32_t blk_size; 53 uint8_t physical_block_exp; 54 uint8_t alignment_offset; 55 uint16_t min_io_size; 56 uint32_t opt_io_size; 57 uint8_t wce; 58 } QEMU_PACKED; 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 /* Flush the volatile write cache */ 68 #define VIRTIO_BLK_T_FLUSH 4 69 70 /* return the device ID string */ 71 #define VIRTIO_BLK_T_GET_ID 8 72 73 /* Barrier before this op. */ 74 #define VIRTIO_BLK_T_BARRIER 0x80000000 75 76 /* This is the first element of the read scatter-gather list. */ 77 struct virtio_blk_outhdr 78 { 79 /* VIRTIO_BLK_T* */ 80 uint32_t type; 81 /* io priority. */ 82 uint32_t ioprio; 83 /* Sector (ie. 512 byte offset) */ 84 uint64_t sector; 85 }; 86 87 #define VIRTIO_BLK_S_OK 0 88 #define VIRTIO_BLK_S_IOERR 1 89 #define VIRTIO_BLK_S_UNSUPP 2 90 91 /* This is the last element of the write scatter-gather list */ 92 struct virtio_blk_inhdr 93 { 94 unsigned char status; 95 }; 96 97 /* SCSI pass-through header */ 98 struct virtio_scsi_inhdr 99 { 100 uint32_t errors; 101 uint32_t data_len; 102 uint32_t sense_len; 103 uint32_t residual; 104 }; 105 106 struct VirtIOBlkConf 107 { 108 BlockConf conf; 109 char *serial; 110 uint32_t scsi; 111 uint32_t config_wce; 112 uint32_t data_plane; 113 }; 114 115 struct VirtIOBlockDataPlane; 116 117 typedef struct VirtIOBlock { 118 VirtIODevice parent_obj; 119 BlockDriverState *bs; 120 VirtQueue *vq; 121 void *rq; 122 QEMUBH *bh; 123 BlockConf *conf; 124 VirtIOBlkConf blk; 125 unsigned short sector_mask; 126 VMChangeStateEntry *change; 127 #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE 128 struct VirtIOBlockDataPlane *dataplane; 129 #endif 130 } VirtIOBlock; 131 132 #define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \ 133 DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) 134 135 #ifdef __linux__ 136 #define DEFINE_VIRTIO_BLK_PROPERTIES(_state, _field) \ 137 DEFINE_BLOCK_PROPERTIES(_state, _field.conf), \ 138 DEFINE_BLOCK_CHS_PROPERTIES(_state, _field.conf), \ 139 DEFINE_PROP_STRING("serial", _state, _field.serial), \ 140 DEFINE_PROP_BIT("config-wce", _state, _field.config_wce, 0, true), \ 141 DEFINE_PROP_BIT("scsi", _state, _field.scsi, 0, true) 142 #else 143 #define DEFINE_VIRTIO_BLK_PROPERTIES(_state, _field) \ 144 DEFINE_BLOCK_PROPERTIES(_state, _field.conf), \ 145 DEFINE_BLOCK_CHS_PROPERTIES(_state, _field.conf), \ 146 DEFINE_PROP_STRING("serial", _state, _field.serial), \ 147 DEFINE_PROP_BIT("config-wce", _state, _field.config_wce, 0, true) 148 #endif /* __linux__ */ 149 150 void virtio_blk_set_conf(DeviceState *dev, VirtIOBlkConf *blk); 151 152 #endif 153