1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0 3 * 4 * This file is provided under a dual BSD/GPLv2 license. When using or 5 * redistributing this file, you may do so under either license. 6 * 7 * GPL LICENSE SUMMARY 8 * 9 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of version 2 of the GNU General Public License as 13 * published by the Free Software Foundation. 14 * 15 * This program is distributed in the hope that it will be useful, but 16 * WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 23 * The full GNU General Public License is included in this distribution 24 * in the file called LICENSE.GPL. 25 * 26 * BSD LICENSE 27 * 28 * Copyright(c) 2008 - 2011 Intel Corporation. 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IN NO EVENT SHALL THE COPYRIGHT 46 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 47 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 48 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 49 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 50 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 51 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 52 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 53 */ 54 #ifndef _SATI_DESIGN_H_ 55 #define _SATI_DESIGN_H_ 56 57 /** 58 @page sati_design_page SATI High Level Design 59 60 <b>Authors:</b> 61 - Nathan Marushak 62 63 @section scif_sas_scope_and_audience Scope and Audience 64 65 This document provides design information relating to the SCSI to ATA 66 Translation Implementation (SATI). Driver developers are the primary 67 audience for this document. The reader is expected to have an understanding 68 of SCSI (Simple Computer Storage Interface), ATA (Advanced Technology 69 Attachment), and SAT (SCSI-to-ATA Translation). 70 71 Please refer to www.t10.org for specifications relating to SCSI and SAT. 72 Please refer to www.t13.org for specifications relating to ATA. 73 74 @section overview Overview 75 76 SATI provides environment agnostic functionality for translating SCSI 77 commands, data, and responses into ATA commands, data, and responses. As 78 a result, in some instances the user must fill out callbacks to set data. 79 This ensures that user isn't forced to have to copy the data an additional 80 time due to memory access restrictions. 81 82 SATI complies with the t10 SAT specification where possible. In cases where 83 there are variances the design and implementation will make note. 84 Additionally, for parameters, pages, functionality, or commands for which 85 SATI is unable to translate, SATI will return sense data indicating 86 INVALID FIELD IN CDB. 87 88 SATI has two primary entry points from which the user can enter: 89 - sati_translate_command() 90 - sati_translate_response() (this method performs data translation). 91 92 Additionally, SATI provides a means through which the user can query to 93 determine the t10 specification revision with which SATI is compliant. For 94 more information please refer to: 95 - sati_get_sat_compliance_version() 96 - sati_get_sat_compliance_version_revision() 97 98 @section sati_definitions Definitions 99 100 - scsi_io: The SCSI IO is considered to be the user's SCSI IO request object 101 (e.g. the windows driver IO request object and SRB). It is passed back to 102 the user via callback methods to retrieve required SCSI information (e.g. CDB, 103 response IU address, etc.). The SCSI IO is just a cookie and can represent 104 any value the caller desires, but the user must be able to utilize this value 105 when it is passed back through callback methods during translation. 106 - ata_io: The ATA IO is considered to be the user's ATA IO request object. If 107 you are utilizing the SCI Framework, then the SCI Framework is the ATA IO. 108 The ATA IO is just a cookie and can represent any value the caller desires, 109 but the user must be able to utilize this value when it is passed back 110 through callback methods during translation. 111 112 @section sati_use_cases Use Cases 113 114 The SCSI Primary Command (SPC) set is comprised of commands that are valid 115 for all device types defined in SCSI. Some of these commands have 116 sub-commands or parameter data defined in another specification (e.g. SBC, SAT). 117 These separate sub-commands or parameter data are captured in the SPC use 118 case diagram for simplicity. 119 120 @note 121 - For simplicify the association between the actor and the use cases 122 has not been drawn, but is assumed. 123 - The use cases in green indicate the use case has been implemented in 124 source. 125 126 @image html Use_Case_Diagram__SATI__SATI_-_SPC.jpg "SCSI Primary Command Translation Use Cases" 127 128 The SCSI Block Command (SBC) set is comprised of commands that are valid for 129 block devices (e.g. disks). 130 131 @image html Use_Case_Diagram__SATI__SATI_-_SBC.jpg "SCSI Block Command Translation Use Cases" 132 133 The SCSI-to-ATA Translation (SAT) specification defines a few of its own 134 commands, parameter data, and log pages. This use case diagram, however, only 135 captures the SAT specific commands being translated. 136 137 @image html Use_Case_Diagram__SATI__SATI_-_SAT_Specific.jpg "SCSI-to-ATA Translation Specific Use Cases" 138 139 @section sati_class_hierarchy Class Hierarchy 140 141 @image html Class_Diagram__SATI__Class_Diagram.jpg "SATI Class Diagram" 142 143 @section sati_sequences Sequence Diagrams 144 145 @note These sequence diagrams are currently a little out of date. An 146 update is required. 147 148 This sequence diagram simply depicts the high-level translation sequence to 149 be followed for command translations. 150 151 @image html Sequence_Diagram__General_Cmd_Translation_Sequence__General_Cmd_Translation_Sequence.jpg "General Command Translation Sequence" 152 153 This sequence diagram simply depicts the high-level translation sequence to 154 be followed for response translations. 155 156 @image html Sequence_Diagram__General_Rsp_Translation_Sequence__General_Rsp_Translation_Sequence.jpg "General Response Translation Sequence" 157 158 This sequence diagram simply depicts the high-level translation sequence to 159 be followed for data translations. Some SCSI commands such as READ CAPACITY, 160 INQUIRY, etc. have payload data associated with them. As a result, it is 161 necessary for the ATA payload data to be translated to meet the expected SCSI 162 output. 163 164 @image html Sequence_Diagram__General_Data_Translation_Sequence__General_Data_Translation_Sequence.jpg "General Data Translation Sequence" 165 166 */ 167 168 #endif // _SATI_DESIGN_H_ 169 170