/* * Virtio Block Device * * Copyright IBM, Corp. 2007 * * Authors: * Anthony Liguori <aliguori@us.ibm.com> * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. * */ #ifndef _QEMU_VIRTIO_BLK_H #define _QEMU_VIRTIO_BLK_H #include "virtio.h" #include "block.h" /* from Linux's linux/virtio_blk.h */ /* The ID for virtio_block */ #define VIRTIO_ID_BLOCK 2 /* Feature bits */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ #define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */ #define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */ #define VIRTIO_BLK_F_GEOMETRY 4 /* Indicates support of legacy geometry */ #define VIRTIO_BLK_F_RO 5 /* Disk is read-only */ #define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/ #define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */ /* #define VIRTIO_BLK_F_IDENTIFY 8 ATA IDENTIFY supported, DEPRECATED */ #define VIRTIO_BLK_F_WCACHE 9 /* write cache enabled */ #define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */ struct virtio_blk_config { uint64_t capacity; uint32_t size_max; uint32_t seg_max; uint16_t cylinders; uint8_t heads; uint8_t sectors; uint32_t blk_size; uint8_t physical_block_exp; uint8_t alignment_offset; uint16_t min_io_size; uint32_t opt_io_size; } __attribute__((packed)); /* These two define direction. */ #define VIRTIO_BLK_T_IN 0 #define VIRTIO_BLK_T_OUT 1 /* This bit says it's a scsi command, not an actual read or write. */ #define VIRTIO_BLK_T_SCSI_CMD 2 /* Flush the volatile write cache */ #define VIRTIO_BLK_T_FLUSH 4 /* return the device ID string */ #define VIRTIO_BLK_T_GET_ID 8 /* Barrier before this op. */ #define VIRTIO_BLK_T_BARRIER 0x80000000 /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ uint32_t type; /* io priority. */ uint32_t ioprio; /* Sector (ie. 512 byte offset) */ uint64_t sector; }; #define VIRTIO_BLK_S_OK 0 #define VIRTIO_BLK_S_IOERR 1 #define VIRTIO_BLK_S_UNSUPP 2 /* This is the last element of the write scatter-gather list */ struct virtio_blk_inhdr { unsigned char status; }; /* SCSI pass-through header */ struct virtio_scsi_inhdr { uint32_t errors; uint32_t data_len; uint32_t sense_len; uint32_t residual; }; #ifdef __linux__ #define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \ DEFINE_VIRTIO_COMMON_FEATURES(_state, _field), \ DEFINE_PROP_BIT("scsi", _state, _field, VIRTIO_BLK_F_SCSI, true) #else #define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \ DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) #endif #endif