include/linux/virtio_scsi.h

   1 /*
   2  * This header is BSD licensed so anyone can use the definitions to implement
   3  * compatible drivers/servers.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #ifndef _LINUX_VIRTIO_SCSI_H
  28 #define _LINUX_VIRTIO_SCSI_H
  29
  30 #define VIRTIO_SCSI_CDB_SIZE   32
  31 #define VIRTIO_SCSI_SENSE_SIZE 96
  32
  33 /* SCSI command request, followed by data-out */
  34 struct virtio_scsi_cmd_req {
  35         u8 lun[8];              /* Logical Unit Number */
  36         u64 tag;                /* Command identifier */
  37         u8 task_attr;           /* Task attribute */
  38         u8 prio;                /* SAM command priority field */
  39         u8 crn;
  40         u8 cdb[VIRTIO_SCSI_CDB_SIZE];
  41 } __packed;
  42
  43 /* SCSI command request, followed by protection information */
  44 struct virtio_scsi_cmd_req_pi {
  45         u8 lun[8];              /* Logical Unit Number */
  46         u64 tag;                /* Command identifier */
  47         u8 task_attr;           /* Task attribute */
  48         u8 prio;                /* SAM command priority field */
  49         u8 crn;
  50         u32 pi_bytesout;        /* DataOUT PI Number of bytes */
  51         u32 pi_bytesin;         /* DataIN PI Number of bytes */
  52         u8 cdb[VIRTIO_SCSI_CDB_SIZE];
  53 } __packed;
  54
  55 /* Response, followed by sense data and data-in */
  56 struct virtio_scsi_cmd_resp {
  57         u32 sense_len;          /* Sense data length */
  58         u32 resid;              /* Residual bytes in data buffer */
  59         u16 status_qualifier;   /* Status qualifier */
  60         u8 status;              /* Command completion status */
  61         u8 response;            /* Response values */
  62         u8 sense[VIRTIO_SCSI_SENSE_SIZE];
  63 } __packed;
  64
  65 /* Task Management Request */
  66 struct virtio_scsi_ctrl_tmf_req {
  67         u32 type;
  68         u32 subtype;
  69         u8 lun[8];
  70         u64 tag;
  71 } __packed;
  72
  73 struct virtio_scsi_ctrl_tmf_resp {
  74         u8 response;
  75 } __packed;
  76
  77 /* Asynchronous notification query/subscription */
  78 struct virtio_scsi_ctrl_an_req {
  79         u32 type;
  80         u8 lun[8];
  81         u32 event_requested;
  82 } __packed;
  83
  84 struct virtio_scsi_ctrl_an_resp {
  85         u32 event_actual;
  86         u8 response;
  87 } __packed;
  88
  89 struct virtio_scsi_event {
  90         u32 event;
  91         u8 lun[8];
  92         u32 reason;
  93 } __packed;
  94
  95 struct virtio_scsi_config {
  96         u32 num_queues;
  97         u32 seg_max;
  98         u32 max_sectors;
  99         u32 cmd_per_lun;
 100         u32 event_info_size;
 101         u32 sense_size;
 102         u32 cdb_size;
 103         u16 max_channel;
 104         u16 max_target;
 105         u32 max_lun;
 106 } __packed;
 107
 108 /* Feature Bits */
 109 #define VIRTIO_SCSI_F_INOUT                    0
 110 #define VIRTIO_SCSI_F_HOTPLUG                  1
 111 #define VIRTIO_SCSI_F_CHANGE                   2
 112 #define VIRTIO_SCSI_F_T10_PI                   3
 113
 114 /* Response codes */
 115 #define VIRTIO_SCSI_S_OK                       0
 116 #define VIRTIO_SCSI_S_OVERRUN                  1
 117 #define VIRTIO_SCSI_S_ABORTED                  2
 118 #define VIRTIO_SCSI_S_BAD_TARGET               3
 119 #define VIRTIO_SCSI_S_RESET                    4
 120 #define VIRTIO_SCSI_S_BUSY                     5
 121 #define VIRTIO_SCSI_S_TRANSPORT_FAILURE        6
 122 #define VIRTIO_SCSI_S_TARGET_FAILURE           7
 123 #define VIRTIO_SCSI_S_NEXUS_FAILURE            8
 124 #define VIRTIO_SCSI_S_FAILURE                  9
 125 #define VIRTIO_SCSI_S_FUNCTION_SUCCEEDED       10
 126 #define VIRTIO_SCSI_S_FUNCTION_REJECTED        11
 127 #define VIRTIO_SCSI_S_INCORRECT_LUN            12
 128
 129 /* Controlq type codes.  */
 130 #define VIRTIO_SCSI_T_TMF                      0
 131 #define VIRTIO_SCSI_T_AN_QUERY                 1
 132 #define VIRTIO_SCSI_T_AN_SUBSCRIBE             2
 133
 134 /* Valid TMF subtypes.  */
 135 #define VIRTIO_SCSI_T_TMF_ABORT_TASK           0
 136 #define VIRTIO_SCSI_T_TMF_ABORT_TASK_SET       1
 137 #define VIRTIO_SCSI_T_TMF_CLEAR_ACA            2
 138 #define VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET       3
 139 #define VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET      4
 140 #define VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET   5
 141 #define VIRTIO_SCSI_T_TMF_QUERY_TASK           6
 142 #define VIRTIO_SCSI_T_TMF_QUERY_TASK_SET       7
 143
 144 /* Events.  */
 145 #define VIRTIO_SCSI_T_EVENTS_MISSED            0x80000000
 146 #define VIRTIO_SCSI_T_NO_EVENT                 0
 147 #define VIRTIO_SCSI_T_TRANSPORT_RESET          1
 148 #define VIRTIO_SCSI_T_ASYNC_NOTIFY             2
 149 #define VIRTIO_SCSI_T_PARAM_CHANGE             3
 150
 151 /* Reasons of transport reset event */
 152 #define VIRTIO_SCSI_EVT_RESET_HARD             0
 153 #define VIRTIO_SCSI_EVT_RESET_RESCAN           1
 154 #define VIRTIO_SCSI_EVT_RESET_REMOVED          2
 155
 156 #define VIRTIO_SCSI_S_SIMPLE                   0
 157 #define VIRTIO_SCSI_S_ORDERED                  1
 158 #define VIRTIO_SCSI_S_HEAD                     2
 159 #define VIRTIO_SCSI_S_ACA                      3
 160
 161
 162 #endif /* _LINUX_VIRTIO_SCSI_H */