LXR qemu/hw/virtio-blk.h

   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 "virtio.h"
  18#include "hw/block-common.h"
  19
  20/* from Linux's linux/virtio_blk.h */
  21
  22/* The ID for virtio_block */
  23#define VIRTIO_ID_BLOCK 2
  24
  25/* Feature bits */
  26#define VIRTIO_BLK_F_BARRIER    0       /* Does host support barriers? */
  27#define VIRTIO_BLK_F_SIZE_MAX   1       /* Indicates maximum segment size */
  28#define VIRTIO_BLK_F_SEG_MAX    2       /* Indicates maximum # of segments */
  29#define VIRTIO_BLK_F_GEOMETRY   4       /* Indicates support of legacy geometry */
  30#define VIRTIO_BLK_F_RO         5       /* Disk is read-only */
  31#define VIRTIO_BLK_F_BLK_SIZE   6       /* Block size of disk is available*/
  32#define VIRTIO_BLK_F_SCSI       7       /* Supports scsi command passthru */
  33/* #define VIRTIO_BLK_F_IDENTIFY   8       ATA IDENTIFY supported, DEPRECATED */
  34#define VIRTIO_BLK_F_WCE        9       /* write cache enabled */
  35#define VIRTIO_BLK_F_TOPOLOGY   10      /* Topology information is available */
  36#define VIRTIO_BLK_F_CONFIG_WCE 11      /* write cache configurable */
  37
  38#define VIRTIO_BLK_ID_BYTES     20      /* ID string length */
  39
  40struct virtio_blk_config
  41{
  42    uint64_t capacity;
  43    uint32_t size_max;
  44    uint32_t seg_max;
  45    uint16_t cylinders;
  46    uint8_t heads;
  47    uint8_t sectors;
  48    uint32_t blk_size;
  49    uint8_t physical_block_exp;
  50    uint8_t alignment_offset;
  51    uint16_t min_io_size;
  52    uint32_t opt_io_size;
  53    uint8_t wce;
  54} QEMU_PACKED;
  55
  56/* These two define direction. */
  57#define VIRTIO_BLK_T_IN         0
  58#define VIRTIO_BLK_T_OUT        1
  59
  60/* This bit says it's a scsi command, not an actual read or write. */
  61#define VIRTIO_BLK_T_SCSI_CMD   2
  62
  63/* Flush the volatile write cache */
  64#define VIRTIO_BLK_T_FLUSH      4
  65
  66/* return the device ID string */
  67#define VIRTIO_BLK_T_GET_ID     8
  68
  69/* Barrier before this op. */
  70#define VIRTIO_BLK_T_BARRIER    0x80000000
  71
  72/* This is the first element of the read scatter-gather list. */
  73struct virtio_blk_outhdr
  74{
  75    /* VIRTIO_BLK_T* */
  76    uint32_t type;
  77    /* io priority. */
  78    uint32_t ioprio;
  79    /* Sector (ie. 512 byte offset) */
  80    uint64_t sector;
  81};
  82
  83#define VIRTIO_BLK_S_OK         0
  84#define VIRTIO_BLK_S_IOERR      1
  85#define VIRTIO_BLK_S_UNSUPP     2
  86
  87/* This is the last element of the write scatter-gather list */
  88struct virtio_blk_inhdr
  89{
  90    unsigned char status;
  91};
  92
  93/* SCSI pass-through header */
  94struct virtio_scsi_inhdr
  95{
  96    uint32_t errors;
  97    uint32_t data_len;
  98    uint32_t sense_len;
  99    uint32_t residual;
 100};
 101
 102struct VirtIOBlkConf
 103{
 104    BlockConf conf;
 105    char *serial;
 106    uint32_t scsi;
 107    uint32_t config_wce;
 108    uint32_t data_plane;
 109};
 110
 111#define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \
 112        DEFINE_VIRTIO_COMMON_FEATURES(_state, _field)
 113
 114#endif
 115