drivers/staging/hv/vstorage.h

   1 /*
   2  *
   3  * Copyright (c) 2009, Microsoft Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  * Authors:
  19  *   Haiyang Zhang <haiyangz@microsoft.com>
  20  *   Hank Janssen  <hjanssen@microsoft.com>
  21  *
  22  */
  23
  24 /* vstorage.w revision number.  This is used in the case of a version match, */
  25 /* to alert the user that structure sizes may be mismatched even though the */
  26 /* protocol versions match. */
  27
  28 #define REVISION_STRING(REVISION_) #REVISION_
  29 #define FILL_VMSTOR_REVISION(RESULT_LVALUE_)                            \
  30 {                                                                       \
  31         char *revisionString = REVISION_STRING($Revision : 6 $) + 11;   \
  32         RESULT_LVALUE_ = 0;                                             \
  33         while (*revisionString >= '0' && *revisionString <= '9') {      \
  34                 RESULT_LVALUE_ *= 10;                                   \
  35                 RESULT_LVALUE_ += *revisionString - '0';                \
  36                 revisionString++;                                       \
  37         }                                                               \
  38 }
  39
  40 /* Major/minor macros.  Minor version is in LSB, meaning that earlier flat */
  41 /* version numbers will be interpreted as "0.x" (i.e., 1 becomes 0.1). */
  42 #define VMSTOR_PROTOCOL_MAJOR(VERSION_)         (((VERSION_) >> 8) & 0xff)
  43 #define VMSTOR_PROTOCOL_MINOR(VERSION_)         (((VERSION_))      & 0xff)
  44 #define VMSTOR_PROTOCOL_VERSION(MAJOR_, MINOR_) ((((MAJOR_) & 0xff) << 8) | \
  45                                                  (((MINOR_) & 0xff)))
  46 #define VMSTOR_INVALID_PROTOCOL_VERSION         (-1)
  47
  48 /* Version history: */
  49 /* V1 Beta                    0.1 */
  50 /* V1 RC < 2008/1/31          1.0 */
  51 /* V1 RC > 2008/1/31          2.0 */
  52 #define VMSTOR_PROTOCOL_VERSION_CURRENT VMSTOR_PROTOCOL_VERSION(2, 0)
  53
  54
  55
  56
  57 /*  This will get replaced with the max transfer length that is possible on */
  58 /*  the host adapter. */
  59 /*  The max transfer length will be published when we offer a vmbus channel. */
  60 #define MAX_TRANSFER_LENGTH     0x40000
  61 #define DEFAULT_PACKET_SIZE (sizeof(struct vmdata_gpa_direct) + \
  62                         sizeof(struct vstor_packet) +           \
  63                         sizesizeof(u64) * (MAX_TRANSFER_LENGTH / PAGE_SIZE)))
  64
  65
  66 /*  Packet structure describing virtual storage requests. */
  67 enum vstor_packet_operation {
  68         VStorOperationCompleteIo            = 1,
  69         VStorOperationRemoveDevice          = 2,
  70         VStorOperationExecuteSRB            = 3,
  71         VStorOperationResetLun              = 4,
  72         VStorOperationResetAdapter          = 5,
  73         VStorOperationResetBus              = 6,
  74         VStorOperationBeginInitialization   = 7,
  75         VStorOperationEndInitialization     = 8,
  76         VStorOperationQueryProtocolVersion  = 9,
  77         VStorOperationQueryProperties       = 10,
  78         VStorOperationMaximum               = 10
  79 };
  80
  81 /*
  82  * Platform neutral description of a scsi request -
  83  * this remains the same across the write regardless of 32/64 bit
  84  * note: it's patterned off the SCSI_PASS_THROUGH structure
  85  */
  86 #define CDB16GENERIC_LENGTH                     0x10
  87
  88 #ifndef SENSE_BUFFER_SIZE
  89 #define SENSE_BUFFER_SIZE                       0x12
  90 #endif
  91
  92 #define MAX_DATA_BUFFER_LENGTH_WITH_PADDING     0x14
  93
  94 struct vmscsi_request {
  95         unsigned short Length;
  96         unsigned char SrbStatus;
  97         unsigned char ScsiStatus;
  98
  99         unsigned char PortNumber;
 100         unsigned char PathId;
 101         unsigned char TargetId;
 102         unsigned char Lun;
 103
 104         unsigned char CdbLength;
 105         unsigned char SenseInfoLength;
 106         unsigned char DataIn;
 107         unsigned char Reserved;
 108
 109         unsigned int DataTransferLength;
 110
 111         union {
 112         unsigned char Cdb[CDB16GENERIC_LENGTH];
 113
 114         unsigned char SenseData[SENSE_BUFFER_SIZE];
 115
 116         unsigned char ReservedArray[MAX_DATA_BUFFER_LENGTH_WITH_PADDING];
 117         };
 118 } __attribute((packed));
 119
 120
 121 /*
 122  * This structure is sent during the intialization phase to get the different
 123  * properties of the channel.
 124  */
 125 struct vmstorage_channel_properties {
 126         unsigned short ProtocolVersion;
 127         unsigned char  PathId;
 128         unsigned char  TargetId;
 129
 130         /* Note: port number is only really known on the client side */
 131         unsigned int  PortNumber;
 132         unsigned int  Flags;
 133         unsigned int  MaxTransferBytes;
 134
 135         /*  This id is unique for each channel and will correspond with */
 136         /*  vendor specific data in the inquirydata */
 137         unsigned long long UniqueId;
 138 } __attribute__((packed));
 139
 140 /*  This structure is sent during the storage protocol negotiations. */
 141 struct vmstorage_protocol_version {
 142         /* Major (MSW) and minor (LSW) version numbers. */
 143         unsigned short MajorMinor;
 144
 145         /*
 146          * Revision number is auto-incremented whenever this file is changed
 147          * (See FILL_VMSTOR_REVISION macro above).  Mismatch does not
 148          * definitely indicate incompatibility--but it does indicate mismatched
 149          * builds.
 150          */
 151         unsigned short Revision;
 152 } __attribute__((packed));
 153
 154 /* Channel Property Flags */
 155 #define STORAGE_CHANNEL_REMOVABLE_FLAG          0x1
 156 #define STORAGE_CHANNEL_EMULATED_IDE_FLAG       0x2
 157
 158 struct vstor_packet {
 159         /* Requested operation type */
 160         enum vstor_packet_operation Operation;
 161
 162         /*  Flags - see below for values */
 163         unsigned int     Flags;
 164
 165         /* Status of the request returned from the server side. */
 166         unsigned int     Status;
 167
 168         /* Data payload area */
 169         union {
 170                 /*
 171                  * Structure used to forward SCSI commands from the
 172                  * client to the server.
 173                  */
 174                 struct vmscsi_request VmSrb;
 175
 176                 /* Structure used to query channel properties. */
 177                 struct vmstorage_channel_properties StorageChannelProperties;
 178
 179                 /* Used during version negotiations. */
 180                 struct vmstorage_protocol_version Version;
 181         };
 182 } __attribute__((packed));
 183
 184 /* Packet flags */
 185 /*
 186  * This flag indicates that the server should send back a completion for this
 187  * packet.
 188  */
 189 #define REQUEST_COMPLETION_FLAG 0x1
 190
 191 /*  This is the set of flags that the vsc can set in any packets it sends */
 192 #define VSC_LEGAL_FLAGS         (REQUEST_COMPLETION_FLAG)