qemu-vio-blk.h

   1 #ifndef QUEMU_VIO_BLK_H
   2 #define QUEMU_VIO_BLK_H
   3
   4 #include <stdint.h>
   5
   6 #include "targphys.h"
   7 #include "block.h"
   8 #include "qemu-vio-virtio.h"
   9
  10 /* Flush the volatile write cache */
  11 #define VIRTIO_BLK_T_FLUSH      4
  12
  13 /* This bit says it's a scsi command, not an actual read or write. */
  14 #define VIRTIO_BLK_T_SCSI_CMD   2
  15
  16 #define QEMU_VIO_BLK_ID_LEN     256     /* length of identify u16 array */
  17
  18 /* These two define direction. */
  19 #define VIRTIO_BLK_T_IN         0
  20 #define VIRTIO_BLK_T_OUT        1
  21
  22 #define VIRTIO_BLK_S_OK         0
  23 #define VIRTIO_BLK_S_IOERR      1
  24 #define VIRTIO_BLK_S_UNSUPP     2
  25 #define WAITING_ASYNC_RET       0xFF
  26
  27 /* Feature bits */
  28 #define VIRTIO_BLK_F_BARRIER    0       /* Does host support barriers? */
  29 #define VIRTIO_BLK_F_SIZE_MAX   1       /* Indicates maximum segment size */
  30 #define VIRTIO_BLK_F_SEG_MAX    2       /* Indicates maximum # of segments */
  31 #define VIRTIO_BLK_F_GEOMETRY   4       /* Indicates support of legacy geometry */
  32 #define VIRTIO_BLK_F_RO         5       /* Disk is read-only */
  33 #define VIRTIO_BLK_F_BLK_SIZE   6       /* Block size of disk is available*/
  34 #define VIRTIO_BLK_F_SCSI       7       /* Supports scsi command passthru */
  35 #define VIRTIO_BLK_F_IDENTIFY   8       /* ATA IDENTIFY supported */
  36 #define VIRTIO_BLK_F_WCACHE     9       /* write cache enabled */
  37
  38 #define VIRTIO_BLK_ID_LEN       256     /* length of identify u16 array */
  39 #define VIRTIO_BLK_ID_SN        10      /* start of char * serial# */
  40 #define VIRTIO_BLK_ID_SN_BYTES  20      /* length in bytes of serial# */
  41
  42
  43 struct qemu_vio_blk_config
  44 {
  45     uint64_t capacity;
  46     uint32_t size_max;
  47     uint32_t seg_max;
  48     uint16_t cylinders;
  49     uint8_t heads;
  50     uint8_t sectors;
  51     uint32_t _blk_size;    /* structure pad, currently unused */
  52     uint16_t identify[QEMU_VIO_BLK_ID_LEN];
  53 } __attribute__((packed));
  54
  55 VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s);
  56 void virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb);
  57 void do_multiwrite(BlockDriverState *bs, BlockRequest *blkreq,int num_writes);
  58 void do_aio_multiwrite(BlockDriverState *bs, MultiReqBuffer *mrb);
  59 void qemu_vio_exit(BlockDriverState *bs);
  60 void qemu_vio_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs);
  61 int64_t qemu_vio_getlength(BlockDriverState *bs);
  62 BlockErrorAction drive_get_on_error(BlockDriverState *bdrv, int is_read);
  63
  64 #endif /* QUEMU_VIO_H */