| /* |
| * 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" |
| #include "pci.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 */ |
| |
| struct virtio_blk_config |
| { |
| uint64_t capacity; |
| uint32_t size_max; |
| uint32_t seg_max; |
| uint16_t cylinders; |
| uint8_t heads; |
| uint8_t sectors; |
| } __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 |
| |
| /* 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; |
| }; |
| |
| void *virtio_blk_init(PCIBus *bus, BlockDriverState *bs); |
| |
| #endif |