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;
  39         u8 crn;
  40         u8 cdb[VIRTIO_SCSI_CDB_SIZE];
  41 } __packed;
  42
  43 /* Response, followed by sense data and data-in */
  44 struct virtio_scsi_cmd_resp {
  45         u32 sense_len;          /* Sense data length */
  46         u32 resid;              /* Residual bytes in data buffer */
  47         u16 status_qualifier;   /* Status qualifier */
  48         u8 status;              /* Command completion status */
  49         u8 response;            /* Response values */
  50         u8 sense[VIRTIO_SCSI_SENSE_SIZE];
  51 } __packed;
  52
  53 /* Task Management Request */
  54 struct virtio_scsi_ctrl_tmf_req {
  55         u32 type;
  56         u32 subtype;
  57         u8 lun[8];
  58         u64 tag;
  59 } __packed;
  60
  61 struct virtio_scsi_ctrl_tmf_resp {
  62         u8 response;
  63 } __packed;
  64
  65 /* Asynchronous notification query/subscription */
  66 struct virtio_scsi_ctrl_an_req {
  67         u32 type;
  68         u8 lun[8];
  69         u32 event_requested;
  70 } __packed;
  71
  72 struct virtio_scsi_ctrl_an_resp {
  73         u32 event_actual;
  74         u8 response;
  75 } __packed;
  76
  77 struct virtio_scsi_event {
  78         u32 event;
  79         u8 lun[8];
  80         u32 reason;
  81 } __packed;
  82
  83 struct virtio_scsi_config {
  84         u32 num_queues;
  85         u32 seg_max;
  86         u32 max_sectors;
  87         u32 cmd_per_lun;
  88         u32 event_info_size;
  89         u32 sense_size;
  90         u32 cdb_size;
  91         u16 max_channel;
  92         u16 max_target;
  93         u32 max_lun;
  94 } __packed;
  95
  96 /* Feature Bits */
  97 #define VIRTIO_SCSI_F_INOUT                    0
  98 #define VIRTIO_SCSI_F_HOTPLUG                  1
  99 #define VIRTIO_SCSI_F_CHANGE                   2
 100
 101 /* Response codes */
 102 #define VIRTIO_SCSI_S_OK                       0
 103 #define VIRTIO_SCSI_S_OVERRUN                  1
 104 #define VIRTIO_SCSI_S_ABORTED                  2
 105 #define VIRTIO_SCSI_S_BAD_TARGET               3
 106 #define VIRTIO_SCSI_S_RESET                    4
 107 #define VIRTIO_SCSI_S_BUSY                     5
 108 #define VIRTIO_SCSI_S_TRANSPORT_FAILURE        6
 109 #define VIRTIO_SCSI_S_TARGET_FAILURE           7
 110 #define VIRTIO_SCSI_S_NEXUS_FAILURE            8
 111 #define VIRTIO_SCSI_S_FAILURE                  9
 112 #define VIRTIO_SCSI_S_FUNCTION_SUCCEEDED       10
 113 #define VIRTIO_SCSI_S_FUNCTION_REJECTED        11
 114 #define VIRTIO_SCSI_S_INCORRECT_LUN            12
 115
 116 /* Controlq type codes.  */
 117 #define VIRTIO_SCSI_T_TMF                      0
 118 #define VIRTIO_SCSI_T_AN_QUERY                 1
 119 #define VIRTIO_SCSI_T_AN_SUBSCRIBE             2
 120
 121 /* Valid TMF subtypes.  */
 122 #define VIRTIO_SCSI_T_TMF_ABORT_TASK           0
 123 #define VIRTIO_SCSI_T_TMF_ABORT_TASK_SET       1
 124 #define VIRTIO_SCSI_T_TMF_CLEAR_ACA            2
 125 #define VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET       3
 126 #define VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET      4
 127 #define VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET   5
 128 #define VIRTIO_SCSI_T_TMF_QUERY_TASK           6
 129 #define VIRTIO_SCSI_T_TMF_QUERY_TASK_SET       7
 130
 131 /* Events.  */
 132 #define VIRTIO_SCSI_T_EVENTS_MISSED            0x80000000
 133 #define VIRTIO_SCSI_T_NO_EVENT                 0
 134 #define VIRTIO_SCSI_T_TRANSPORT_RESET          1
 135 #define VIRTIO_SCSI_T_ASYNC_NOTIFY             2
 136 #define VIRTIO_SCSI_T_PARAM_CHANGE             3
 137
 138 /* Reasons of transport reset event */
 139 #define VIRTIO_SCSI_EVT_RESET_HARD             0
 140 #define VIRTIO_SCSI_EVT_RESET_RESCAN           1
 141 #define VIRTIO_SCSI_EVT_RESET_REMOVED          2
 142
 143 #define VIRTIO_SCSI_S_SIMPLE                   0
 144 #define VIRTIO_SCSI_S_ORDERED                  1
 145 #define VIRTIO_SCSI_S_HEAD                     2
 146 #define VIRTIO_SCSI_S_ACA                      3
 147
 148
 149 #endif /* _LINUX_VIRTIO_SCSI_H */