include/uapi/scsi/scsi_bsg_ufs.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /*
   3  * UFS Transport SGIO v4 BSG Message Support
   4  *
   5  * Copyright (C) 2011-2013 Samsung India Software Operations
   6  * Copyright (C) 2018 Western Digital Corporation
   7  */
   8 #ifndef SCSI_BSG_UFS_H
   9 #define SCSI_BSG_UFS_H
  10
  11 #include <linux/types.h>
  12 /*
  13  * This file intended to be included by both kernel and user space
  14  */
  15
  16 #define UFS_CDB_SIZE    16
  17 #define UPIU_TRANSACTION_UIC_CMD 0x1F
  18 /* uic commands are 4DW long, per UFSHCI V2.1 paragraph 5.6.1 */
  19 #define UIC_CMD_SIZE (sizeof(__u32) * 4)
  20
  21 /**
  22  * struct utp_upiu_header - UPIU header structure
  23  * @dword_0: UPIU header DW-0
  24  * @dword_1: UPIU header DW-1
  25  * @dword_2: UPIU header DW-2
  26  */
  27 struct utp_upiu_header {
  28         __be32 dword_0;
  29         __be32 dword_1;
  30         __be32 dword_2;
  31 };
  32
  33 /**
  34  * struct utp_upiu_query - upiu request buffer structure for
  35  * query request.
  36  * @opcode: command to perform B-0
  37  * @idn: a value that indicates the particular type of data B-1
  38  * @index: Index to further identify data B-2
  39  * @selector: Index to further identify data B-3
  40  * @reserved_osf: spec reserved field B-4,5
  41  * @length: number of descriptor bytes to read/write B-6,7
  42  * @value: Attribute value to be written DW-5
  43  * @reserved: spec reserved DW-6,7
  44  */
  45 struct utp_upiu_query {
  46         __u8 opcode;
  47         __u8 idn;
  48         __u8 index;
  49         __u8 selector;
  50         __be16 reserved_osf;
  51         __be16 length;
  52         __be32 value;
  53         __be32 reserved[2];
  54 };
  55
  56 /**
  57  * struct utp_upiu_cmd - Command UPIU structure
  58  * @data_transfer_len: Data Transfer Length DW-3
  59  * @cdb: Command Descriptor Block CDB DW-4 to DW-7
  60  */
  61 struct utp_upiu_cmd {
  62         __be32 exp_data_transfer_len;
  63         __u8 cdb[UFS_CDB_SIZE];
  64 };
  65
  66 /**
  67  * struct utp_upiu_req - general upiu request structure
  68  * @header:UPIU header structure DW-0 to DW-2
  69  * @sc: fields structure for scsi command DW-3 to DW-7
  70  * @qr: fields structure for query request DW-3 to DW-7
  71  * @uc: use utp_upiu_query to host the 4 dwords of uic command
  72  */
  73 struct utp_upiu_req {
  74         struct utp_upiu_header header;
  75         union {
  76                 struct utp_upiu_cmd             sc;
  77                 struct utp_upiu_query           qr;
  78                 struct utp_upiu_query           uc;
  79         };
  80 };
  81
  82 /* request (CDB) structure of the sg_io_v4 */
  83 struct ufs_bsg_request {
  84         __u32 msgcode;
  85         struct utp_upiu_req upiu_req;
  86 };
  87
  88 /* response (request sense data) structure of the sg_io_v4 */
  89 struct ufs_bsg_reply {
  90         /*
  91          * The completion result. Result exists in two forms:
  92          * if negative, it is an -Exxx system errno value. There will
  93          * be no further reply information supplied.
  94          * else, it's the 4-byte scsi error result, with driver, host,
  95          * msg and status fields. The per-msgcode reply structure
  96          * will contain valid data.
  97          */
  98         __u32 result;
  99
 100         /* If there was reply_payload, how much was received? */
 101         __u32 reply_payload_rcv_len;
 102
 103         struct utp_upiu_req upiu_rsp;
 104 };
 105 #endif /* UFS_BSG_H */