LXR qemu/pc-bios/s390-ccw/virtio-scsi.h

   1/*
   2 * Virtio-SCSI definitions for s390 machine loader for qemu
   3 *
   4 * Copyright 2015 IBM Corp.
   5 * Author: Eugene "jno" Dvurechenski <jno@linux.vnet.ibm.com>
   6 *
   7 * This work is licensed under the terms of the GNU GPL, version 2 or (at
   8 * your option) any later version. See the COPYING file in the top-level
   9 * directory.
  10 */
  11
  12#ifndef VIRTIO_SCSI_H
  13#define VIRTIO_SCSI_H
  14
  15#include "s390-ccw.h"
  16#include "virtio.h"
  17#include "scsi.h"
  18
  19#define VIRTIO_SCSI_CDB_SIZE   SCSI_DEFAULT_CDB_SIZE
  20#define VIRTIO_SCSI_SENSE_SIZE SCSI_DEFAULT_SENSE_SIZE
  21
  22#define VIRTIO_SCSI_MAX_SECTORS 2048
  23
  24/* command-specific response values */
  25#define VIRTIO_SCSI_S_OK                     0x00
  26#define VIRTIO_SCSI_S_BAD_TARGET             0x03
  27
  28#define QEMU_CDROM_SIGNATURE "QEMU CD-ROM     "
  29
  30enum virtio_scsi_vq_id {
  31    VR_CONTROL  = 0,
  32    VR_EVENT    = 1,
  33    VR_REQUEST  = 2,
  34};
  35
  36struct VirtioScsiCmdReq {
  37    ScsiLun lun;
  38    uint64_t id;
  39    uint8_t task_attr;   /* = 0 = VIRTIO_SCSI_S_SIMPLE */
  40    uint8_t prio;
  41    uint8_t crn;         /* = 0 */
  42    uint8_t cdb[VIRTIO_SCSI_CDB_SIZE];
  43} __attribute__((packed));
  44typedef struct VirtioScsiCmdReq VirtioScsiCmdReq;
  45
  46struct VirtioScsiCmdResp {
  47        uint32_t sense_len;
  48        uint32_t residual;
  49        uint16_t status_qualifier;
  50        uint8_t status;      /* first check for .response    */
  51        uint8_t response;    /* then for .status             */
  52        uint8_t sense[VIRTIO_SCSI_SENSE_SIZE];
  53} __attribute__((packed));
  54typedef struct VirtioScsiCmdResp VirtioScsiCmdResp;
  55
  56static inline const char *virtio_scsi_response_msg(const VirtioScsiCmdResp *r)
  57{
  58    static char err_msg[] = "VS RESP=XX";
  59    uint8_t v = r->response;
  60
  61    fill_hex_val(err_msg + 8, &v, 1);
  62    return err_msg;
  63}
  64
  65static inline bool virtio_scsi_response_ok(const VirtioScsiCmdResp *r)
  66{
  67        return r->response == VIRTIO_SCSI_S_OK && r->status == CDB_STATUS_GOOD;
  68}
  69
  70int virtio_scsi_setup(VDev *vdev);
  71int virtio_scsi_read_many(VDev *vdev,
  72                          ulong sector, void *load_addr, int sec_num);
  73
  74#endif /* VIRTIO_SCSI_H */
  75