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
  30 enum virtio_scsi_vq_id {
  31     VR_CONTROL  = 0,
  32     VR_EVENT    = 1,
  33     VR_REQUEST  = 2,
  34 };
  35
  36 struct 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));
  44 typedef struct VirtioScsiCmdReq VirtioScsiCmdReq;
  45
  46 struct 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));
  54 typedef struct VirtioScsiCmdResp VirtioScsiCmdResp;
  55
  56 static 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
  65 static 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
  70 int virtio_scsi_setup(VDev *vdev);
  71 int virtio_scsi_read_many(VDev *vdev,
  72                           ulong sector, void *load_addr, int sec_num);
  73
  74 #endif /* VIRTIO_SCSI_H */