3 Virtio Block Device specific type and macro definitions corresponding to the
4 virtio-0.9.5 specification.
6 Copyright (C) 2012, Red Hat, Inc.
8 This program and the accompanying materials are licensed and made available
9 under the terms and conditions of the BSD License which accompanies this
10 distribution. The full text of the license may be found at
11 http://opensource.org/licenses/bsd-license.php
13 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
14 WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
18 #ifndef _VIRTIO_BLK_H_
19 #define _VIRTIO_BLK_H_
21 #include <IndustryStandard/Virtio.h>
25 // virtio-0.9.5, Appendix D: Block Device
29 UINT8 PhysicalBlockExp
; // # of logical blocks per physical block (log2)
30 UINT8 AlignmentOffset
; // offset of first aligned logical block
31 UINT16 MinIoSize
; // suggested minimum I/O size in blocks
32 UINT32 OptIoSize
; // optimal (suggested maximum) I/O size in blocks
33 } VIRTIO_BLK_TOPOLOGY
;
43 VIRTIO_BLK_TOPOLOGY Topology
;
47 #define OFFSET_OF_VBLK(Field) OFFSET_OF (VIRTIO_BLK_CONFIG, Field)
48 #define SIZE_OF_VBLK(Field) (sizeof ((VIRTIO_BLK_CONFIG *) 0)->Field)
50 #define VIRTIO_BLK_F_BARRIER BIT0
51 #define VIRTIO_BLK_F_SIZE_MAX BIT1
52 #define VIRTIO_BLK_F_SEG_MAX BIT2
53 #define VIRTIO_BLK_F_GEOMETRY BIT4
54 #define VIRTIO_BLK_F_RO BIT5
55 #define VIRTIO_BLK_F_BLK_SIZE BIT6 // treated as "logical block size" in
56 // practice; actual host side
57 // implementation negotiates "optimal"
58 // block size separately, via
59 // VIRTIO_BLK_F_TOPOLOGY
60 #define VIRTIO_BLK_F_SCSI BIT7
61 #define VIRTIO_BLK_F_FLUSH BIT9 // identical to "write cache enabled"
62 #define VIRTIO_BLK_F_TOPOLOGY BIT10 // information on optimal I/O alignment
65 // We keep the status byte separate from the rest of the virtio-blk request
66 // header. See description of historical scattering at the end of Appendix D:
67 // we're going to put the status byte in a separate VRING_DESC.
77 #define VIRTIO_BLK_T_IN 0x00000000
78 #define VIRTIO_BLK_T_OUT 0x00000001
79 #define VIRTIO_BLK_T_SCSI_CMD 0x00000002
80 #define VIRTIO_BLK_T_SCSI_CMD_OUT 0x00000003
81 #define VIRTIO_BLK_T_FLUSH 0x00000004
82 #define VIRTIO_BLK_T_FLUSH_OUT 0x00000005
83 #define VIRTIO_BLK_T_BARRIER BIT31
85 #define VIRTIO_BLK_S_OK 0x00
86 #define VIRTIO_BLK_S_IOERR 0x01
87 #define VIRTIO_BLK_S_UNSUPP 0x02
89 #endif // _VIRTIO_BLK_H_