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/*
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* Virtio Block Device
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*
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* Copyright IBM, Corp. 2007
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef _QEMU_VIRTIO_BLK_H
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#define _QEMU_VIRTIO_BLK_H
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#include "virtio.h" |
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#include "block.h" |
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/* from Linux's linux/virtio_blk.h */
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/* The ID for virtio_block */
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#define VIRTIO_ID_BLOCK 2 |
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/* Feature bits */
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#define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ |
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#define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */ |
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#define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */ |
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#define VIRTIO_BLK_F_GEOMETRY 4 /* Indicates support of legacy geometry */ |
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#define VIRTIO_BLK_F_RO 5 /* Disk is read-only */ |
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#define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/ |
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#define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */ |
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#define VIRTIO_BLK_F_IDENTIFY 8 /* ATA IDENTIFY supported */ |
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#define VIRTIO_BLK_F_WCACHE 9 /* write cache enabled */ |
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#define VIRTIO_BLK_ID_LEN 256 /* length of identify u16 array */ |
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#define VIRTIO_BLK_ID_SN 10 /* start of char * serial# */ |
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#define VIRTIO_BLK_ID_SN_BYTES 20 /* length in bytes of serial# */ |
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struct virtio_blk_config
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{ |
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uint64_t capacity; |
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uint32_t size_max; |
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uint32_t seg_max; |
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uint16_t cylinders; |
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uint8_t heads; |
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uint8_t sectors; |
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uint32_t _blk_size; /* structure pad, currently unused */
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uint16_t identify[VIRTIO_BLK_ID_LEN]; |
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} __attribute__((packed)); |
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/* These two define direction. */
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#define VIRTIO_BLK_T_IN 0 |
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#define VIRTIO_BLK_T_OUT 1 |
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/* This bit says it's a scsi command, not an actual read or write. */
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#define VIRTIO_BLK_T_SCSI_CMD 2 |
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/* Flush the volatile write cache */
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#define VIRTIO_BLK_T_FLUSH 4 |
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/* Barrier before this op. */
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#define VIRTIO_BLK_T_BARRIER 0x80000000 |
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/* This is the first element of the read scatter-gather list. */
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struct virtio_blk_outhdr
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{ |
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/* VIRTIO_BLK_T* */
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uint32_t type; |
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/* io priority. */
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uint32_t ioprio; |
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/* Sector (ie. 512 byte offset) */
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uint64_t sector; |
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}; |
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#define VIRTIO_BLK_S_OK 0 |
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#define VIRTIO_BLK_S_IOERR 1 |
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#define VIRTIO_BLK_S_UNSUPP 2 |
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/* This is the last element of the write scatter-gather list */
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struct virtio_blk_inhdr
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{ |
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unsigned char status; |
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}; |
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/* SCSI pass-through header */
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struct virtio_scsi_inhdr
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{ |
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uint32_t errors; |
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uint32_t data_len; |
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uint32_t sense_len; |
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uint32_t residual; |
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}; |
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#endif
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