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virtio-scsi.h (2076B)

      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_read_many(VDev *vdev,
     71                           ulong sector, void *load_addr, int sec_num);
     72 int virtio_scsi_setup_device(SubChannelId schid);
     73 
     74 #endif /* VIRTIO_SCSI_H */