forked from Minki/linux
docs-rst: convert scsi DocBook to ReST
Use pandoc to convert documentation to ReST by calling Documentation/sphinx/tmplcvt script. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab
parent
c7e2154475
commit
6020236568
@ -9,7 +9,6 @@
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DOCBOOKS := \
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lsm.xml \
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mtdnand.xml librs.xml rapidio.xml \
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scsi.xml \
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sh.xml w1.xml
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ifeq ($(DOCBOOKS),)
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@ -1,409 +0,0 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
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<book id="scsimid">
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<bookinfo>
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<title>SCSI Interfaces Guide</title>
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<authorgroup>
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<author>
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<firstname>James</firstname>
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<surname>Bottomley</surname>
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<affiliation>
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<address>
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<email>James.Bottomley@hansenpartnership.com</email>
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</address>
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</affiliation>
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</author>
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<author>
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<firstname>Rob</firstname>
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<surname>Landley</surname>
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<affiliation>
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<address>
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<email>rob@landley.net</email>
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</address>
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</affiliation>
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</author>
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</authorgroup>
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<copyright>
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<year>2007</year>
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<holder>Linux Foundation</holder>
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</copyright>
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<legalnotice>
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<para>
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This documentation is free software; you can redistribute
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it and/or modify it under the terms of the GNU General Public
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License version 2.
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</para>
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<para>
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This program is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied
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warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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For more details see the file COPYING in the source
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distribution of Linux.
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</para>
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</legalnotice>
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</bookinfo>
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<toc></toc>
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<chapter id="intro">
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<title>Introduction</title>
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<sect1 id="protocol_vs_bus">
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<title>Protocol vs bus</title>
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<para>
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Once upon a time, the Small Computer Systems Interface defined both
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a parallel I/O bus and a data protocol to connect a wide variety of
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peripherals (disk drives, tape drives, modems, printers, scanners,
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optical drives, test equipment, and medical devices) to a host
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computer.
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</para>
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<para>
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Although the old parallel (fast/wide/ultra) SCSI bus has largely
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fallen out of use, the SCSI command set is more widely used than ever
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to communicate with devices over a number of different busses.
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</para>
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<para>
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The <ulink url='http://www.t10.org/scsi-3.htm'>SCSI protocol</ulink>
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is a big-endian peer-to-peer packet based protocol. SCSI commands
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are 6, 10, 12, or 16 bytes long, often followed by an associated data
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payload.
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</para>
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<para>
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SCSI commands can be transported over just about any kind of bus, and
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are the default protocol for storage devices attached to USB, SATA,
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SAS, Fibre Channel, FireWire, and ATAPI devices. SCSI packets are
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also commonly exchanged over Infiniband,
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<ulink url='http://i2o.shadowconnect.com/faq.php'>I20</ulink>, TCP/IP
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(<ulink url='https://en.wikipedia.org/wiki/ISCSI'>iSCSI</ulink>), even
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<ulink url='http://cyberelk.net/tim/parport/parscsi.html'>Parallel
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ports</ulink>.
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</para>
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</sect1>
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<sect1 id="subsystem_design">
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<title>Design of the Linux SCSI subsystem</title>
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<para>
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The SCSI subsystem uses a three layer design, with upper, mid, and low
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layers. Every operation involving the SCSI subsystem (such as reading
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a sector from a disk) uses one driver at each of the 3 levels: one
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upper layer driver, one lower layer driver, and the SCSI midlayer.
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</para>
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<para>
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The SCSI upper layer provides the interface between userspace and the
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kernel, in the form of block and char device nodes for I/O and
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ioctl(). The SCSI lower layer contains drivers for specific hardware
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devices.
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</para>
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<para>
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In between is the SCSI mid-layer, analogous to a network routing
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layer such as the IPv4 stack. The SCSI mid-layer routes a packet
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based data protocol between the upper layer's /dev nodes and the
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corresponding devices in the lower layer. It manages command queues,
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provides error handling and power management functions, and responds
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to ioctl() requests.
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</para>
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</sect1>
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</chapter>
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<chapter id="upper_layer">
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<title>SCSI upper layer</title>
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<para>
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The upper layer supports the user-kernel interface by providing
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device nodes.
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</para>
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<sect1 id="sd">
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<title>sd (SCSI Disk)</title>
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<para>sd (sd_mod.o)</para>
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<!-- !Idrivers/scsi/sd.c -->
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</sect1>
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<sect1 id="sr">
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<title>sr (SCSI CD-ROM)</title>
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<para>sr (sr_mod.o)</para>
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</sect1>
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<sect1 id="st">
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<title>st (SCSI Tape)</title>
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<para>st (st.o)</para>
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</sect1>
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<sect1 id="sg">
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<title>sg (SCSI Generic)</title>
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<para>sg (sg.o)</para>
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</sect1>
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<sect1 id="ch">
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<title>ch (SCSI Media Changer)</title>
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<para>ch (ch.c)</para>
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</sect1>
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</chapter>
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<chapter id="mid_layer">
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<title>SCSI mid layer</title>
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<sect1 id="midlayer_implementation">
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<title>SCSI midlayer implementation</title>
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<sect2 id="scsi_device.h">
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<title>include/scsi/scsi_device.h</title>
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<para>
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</para>
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!Iinclude/scsi/scsi_device.h
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</sect2>
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<sect2 id="scsi.c">
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<title>drivers/scsi/scsi.c</title>
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<para>Main file for the SCSI midlayer.</para>
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!Edrivers/scsi/scsi.c
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</sect2>
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<sect2 id="scsicam.c">
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<title>drivers/scsi/scsicam.c</title>
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<para>
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<ulink url='http://www.t10.org/ftp/t10/drafts/cam/cam-r12b.pdf'>SCSI
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Common Access Method</ulink> support functions, for use with
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HDIO_GETGEO, etc.
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</para>
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!Edrivers/scsi/scsicam.c
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</sect2>
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<sect2 id="scsi_error.c">
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<title>drivers/scsi/scsi_error.c</title>
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<para>Common SCSI error/timeout handling routines.</para>
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!Edrivers/scsi/scsi_error.c
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</sect2>
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<sect2 id="scsi_devinfo.c">
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<title>drivers/scsi/scsi_devinfo.c</title>
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<para>
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Manage scsi_dev_info_list, which tracks blacklisted and whitelisted
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devices.
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</para>
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!Idrivers/scsi/scsi_devinfo.c
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</sect2>
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<sect2 id="scsi_ioctl.c">
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<title>drivers/scsi/scsi_ioctl.c</title>
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<para>
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Handle ioctl() calls for SCSI devices.
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</para>
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!Edrivers/scsi/scsi_ioctl.c
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</sect2>
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<sect2 id="scsi_lib.c">
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<title>drivers/scsi/scsi_lib.c</title>
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<para>
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SCSI queuing library.
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</para>
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!Edrivers/scsi/scsi_lib.c
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</sect2>
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<sect2 id="scsi_lib_dma.c">
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<title>drivers/scsi/scsi_lib_dma.c</title>
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<para>
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SCSI library functions depending on DMA
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(map and unmap scatter-gather lists).
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</para>
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!Edrivers/scsi/scsi_lib_dma.c
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</sect2>
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<sect2 id="scsi_module.c">
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<title>drivers/scsi/scsi_module.c</title>
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<para>
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The file drivers/scsi/scsi_module.c contains legacy support for
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old-style host templates. It should never be used by any new driver.
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</para>
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</sect2>
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<sect2 id="scsi_proc.c">
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<title>drivers/scsi/scsi_proc.c</title>
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<para>
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The functions in this file provide an interface between
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the PROC file system and the SCSI device drivers
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It is mainly used for debugging, statistics and to pass
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information directly to the lowlevel driver.
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I.E. plumbing to manage /proc/scsi/*
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</para>
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!Idrivers/scsi/scsi_proc.c
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</sect2>
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<sect2 id="scsi_netlink.c">
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<title>drivers/scsi/scsi_netlink.c</title>
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<para>
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Infrastructure to provide async events from transports to userspace
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via netlink, using a single NETLINK_SCSITRANSPORT protocol for all
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transports.
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See <ulink url='http://marc.info/?l=linux-scsi&m=115507374832500&w=2'>the
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original patch submission</ulink> for more details.
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</para>
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!Idrivers/scsi/scsi_netlink.c
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</sect2>
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<sect2 id="scsi_scan.c">
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<title>drivers/scsi/scsi_scan.c</title>
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<para>
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Scan a host to determine which (if any) devices are attached.
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The general scanning/probing algorithm is as follows, exceptions are
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made to it depending on device specific flags, compilation options,
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and global variable (boot or module load time) settings.
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A specific LUN is scanned via an INQUIRY command; if the LUN has a
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device attached, a scsi_device is allocated and setup for it.
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For every id of every channel on the given host, start by scanning
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LUN 0. Skip hosts that don't respond at all to a scan of LUN 0.
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Otherwise, if LUN 0 has a device attached, allocate and setup a
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scsi_device for it. If target is SCSI-3 or up, issue a REPORT LUN,
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and scan all of the LUNs returned by the REPORT LUN; else,
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sequentially scan LUNs up until some maximum is reached, or a LUN is
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seen that cannot have a device attached to it.
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</para>
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!Idrivers/scsi/scsi_scan.c
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</sect2>
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<sect2 id="scsi_sysctl.c">
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<title>drivers/scsi/scsi_sysctl.c</title>
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<para>
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Set up the sysctl entry: "/dev/scsi/logging_level"
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(DEV_SCSI_LOGGING_LEVEL) which sets/returns scsi_logging_level.
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</para>
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</sect2>
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<sect2 id="scsi_sysfs.c">
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<title>drivers/scsi/scsi_sysfs.c</title>
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<para>
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SCSI sysfs interface routines.
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</para>
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!Edrivers/scsi/scsi_sysfs.c
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</sect2>
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<sect2 id="hosts.c">
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<title>drivers/scsi/hosts.c</title>
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<para>
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mid to lowlevel SCSI driver interface
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</para>
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!Edrivers/scsi/hosts.c
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</sect2>
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<sect2 id="constants.c">
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<title>drivers/scsi/constants.c</title>
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<para>
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mid to lowlevel SCSI driver interface
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</para>
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!Edrivers/scsi/constants.c
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</sect2>
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</sect1>
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<sect1 id="Transport_classes">
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<title>Transport classes</title>
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<para>
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Transport classes are service libraries for drivers in the SCSI
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lower layer, which expose transport attributes in sysfs.
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</para>
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<sect2 id="Fibre_Channel_transport">
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<title>Fibre Channel transport</title>
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<para>
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The file drivers/scsi/scsi_transport_fc.c defines transport attributes
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for Fibre Channel.
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</para>
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!Edrivers/scsi/scsi_transport_fc.c
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</sect2>
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<sect2 id="iSCSI_transport">
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<title>iSCSI transport class</title>
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<para>
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The file drivers/scsi/scsi_transport_iscsi.c defines transport
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attributes for the iSCSI class, which sends SCSI packets over TCP/IP
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connections.
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</para>
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!Edrivers/scsi/scsi_transport_iscsi.c
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</sect2>
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<sect2 id="SAS_transport">
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<title>Serial Attached SCSI (SAS) transport class</title>
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<para>
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The file drivers/scsi/scsi_transport_sas.c defines transport
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attributes for Serial Attached SCSI, a variant of SATA aimed at
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large high-end systems.
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</para>
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<para>
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The SAS transport class contains common code to deal with SAS HBAs,
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an aproximated representation of SAS topologies in the driver model,
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and various sysfs attributes to expose these topologies and management
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interfaces to userspace.
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</para>
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<para>
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In addition to the basic SCSI core objects this transport class
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introduces two additional intermediate objects: The SAS PHY
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as represented by struct sas_phy defines an "outgoing" PHY on
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a SAS HBA or Expander, and the SAS remote PHY represented by
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struct sas_rphy defines an "incoming" PHY on a SAS Expander or
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end device. Note that this is purely a software concept, the
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underlying hardware for a PHY and a remote PHY is the exactly
|
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the same.
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</para>
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<para>
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There is no concept of a SAS port in this code, users can see
|
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what PHYs form a wide port based on the port_identifier attribute,
|
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which is the same for all PHYs in a port.
|
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</para>
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!Edrivers/scsi/scsi_transport_sas.c
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</sect2>
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<sect2 id="SATA_transport">
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<title>SATA transport class</title>
|
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<para>
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The SATA transport is handled by libata, which has its own book of
|
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documentation in this directory.
|
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</para>
|
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</sect2>
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<sect2 id="SPI_transport">
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<title>Parallel SCSI (SPI) transport class</title>
|
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<para>
|
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The file drivers/scsi/scsi_transport_spi.c defines transport
|
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attributes for traditional (fast/wide/ultra) SCSI busses.
|
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</para>
|
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!Edrivers/scsi/scsi_transport_spi.c
|
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</sect2>
|
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<sect2 id="SRP_transport">
|
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<title>SCSI RDMA (SRP) transport class</title>
|
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<para>
|
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The file drivers/scsi/scsi_transport_srp.c defines transport
|
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attributes for SCSI over Remote Direct Memory Access.
|
||||
</para>
|
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!Edrivers/scsi/scsi_transport_srp.c
|
||||
</sect2>
|
||||
</sect1>
|
||||
|
||||
</chapter>
|
||||
|
||||
<chapter id="lower_layer">
|
||||
<title>SCSI lower layer</title>
|
||||
<sect1 id="hba_drivers">
|
||||
<title>Host Bus Adapter transport types</title>
|
||||
<para>
|
||||
Many modern device controllers use the SCSI command set as a protocol to
|
||||
communicate with their devices through many different types of physical
|
||||
connections.
|
||||
</para>
|
||||
<para>
|
||||
In SCSI language a bus capable of carrying SCSI commands is
|
||||
called a "transport", and a controller connecting to such a bus is
|
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called a "host bus adapter" (HBA).
|
||||
</para>
|
||||
<sect2 id="scsi_debug.c">
|
||||
<title>Debug transport</title>
|
||||
<para>
|
||||
The file drivers/scsi/scsi_debug.c simulates a host adapter with a
|
||||
variable number of disks (or disk like devices) attached, sharing a
|
||||
common amount of RAM. Does a lot of checking to make sure that we are
|
||||
not getting blocks mixed up, and panics the kernel if anything out of
|
||||
the ordinary is seen.
|
||||
</para>
|
||||
<para>
|
||||
To be more realistic, the simulated devices have the transport
|
||||
attributes of SAS disks.
|
||||
</para>
|
||||
<para>
|
||||
For documentation see
|
||||
<ulink url='http://sg.danny.cz/sg/sdebug26.html'>http://sg.danny.cz/sg/sdebug26.html</ulink>
|
||||
</para>
|
||||
<!-- !Edrivers/scsi/scsi_debug.c -->
|
||||
</sect2>
|
||||
<sect2 id="todo">
|
||||
<title>todo</title>
|
||||
<para>Parallel (fast/wide/ultra) SCSI, USB, SATA,
|
||||
SAS, Fibre Channel, FireWire, ATAPI devices, Infiniband,
|
||||
I20, iSCSI, Parallel ports, netlink...
|
||||
</para>
|
||||
</sect2>
|
||||
</sect1>
|
||||
</chapter>
|
||||
</book>
|
||||
@ -32,6 +32,7 @@ available subsections can be seen below.
|
||||
i2c
|
||||
hsi
|
||||
edac
|
||||
scsi
|
||||
libata
|
||||
miscellaneous
|
||||
s390-drivers
|
||||
|
||||
344
Documentation/driver-api/scsi.rst
Normal file
344
Documentation/driver-api/scsi.rst
Normal file
@ -0,0 +1,344 @@
|
||||
=====================
|
||||
SCSI Interfaces Guide
|
||||
=====================
|
||||
|
||||
:Author: James Bottomley
|
||||
:Author: Rob Landley
|
||||
|
||||
Introduction
|
||||
============
|
||||
|
||||
Protocol vs bus
|
||||
---------------
|
||||
|
||||
Once upon a time, the Small Computer Systems Interface defined both a
|
||||
parallel I/O bus and a data protocol to connect a wide variety of
|
||||
peripherals (disk drives, tape drives, modems, printers, scanners,
|
||||
optical drives, test equipment, and medical devices) to a host computer.
|
||||
|
||||
Although the old parallel (fast/wide/ultra) SCSI bus has largely fallen
|
||||
out of use, the SCSI command set is more widely used than ever to
|
||||
communicate with devices over a number of different busses.
|
||||
|
||||
The `SCSI protocol <http://www.t10.org/scsi-3.htm>`__ is a big-endian
|
||||
peer-to-peer packet based protocol. SCSI commands are 6, 10, 12, or 16
|
||||
bytes long, often followed by an associated data payload.
|
||||
|
||||
SCSI commands can be transported over just about any kind of bus, and
|
||||
are the default protocol for storage devices attached to USB, SATA, SAS,
|
||||
Fibre Channel, FireWire, and ATAPI devices. SCSI packets are also
|
||||
commonly exchanged over Infiniband,
|
||||
`I20 <http://i2o.shadowconnect.com/faq.php>`__, TCP/IP
|
||||
(`iSCSI <https://en.wikipedia.org/wiki/ISCSI>`__), even `Parallel
|
||||
ports <http://cyberelk.net/tim/parport/parscsi.html>`__.
|
||||
|
||||
Design of the Linux SCSI subsystem
|
||||
----------------------------------
|
||||
|
||||
The SCSI subsystem uses a three layer design, with upper, mid, and low
|
||||
layers. Every operation involving the SCSI subsystem (such as reading a
|
||||
sector from a disk) uses one driver at each of the 3 levels: one upper
|
||||
layer driver, one lower layer driver, and the SCSI midlayer.
|
||||
|
||||
The SCSI upper layer provides the interface between userspace and the
|
||||
kernel, in the form of block and char device nodes for I/O and ioctl().
|
||||
The SCSI lower layer contains drivers for specific hardware devices.
|
||||
|
||||
In between is the SCSI mid-layer, analogous to a network routing layer
|
||||
such as the IPv4 stack. The SCSI mid-layer routes a packet based data
|
||||
protocol between the upper layer's /dev nodes and the corresponding
|
||||
devices in the lower layer. It manages command queues, provides error
|
||||
handling and power management functions, and responds to ioctl()
|
||||
requests.
|
||||
|
||||
SCSI upper layer
|
||||
================
|
||||
|
||||
The upper layer supports the user-kernel interface by providing device
|
||||
nodes.
|
||||
|
||||
sd (SCSI Disk)
|
||||
--------------
|
||||
|
||||
sd (sd_mod.o)
|
||||
|
||||
sr (SCSI CD-ROM)
|
||||
----------------
|
||||
|
||||
sr (sr_mod.o)
|
||||
|
||||
st (SCSI Tape)
|
||||
--------------
|
||||
|
||||
st (st.o)
|
||||
|
||||
sg (SCSI Generic)
|
||||
-----------------
|
||||
|
||||
sg (sg.o)
|
||||
|
||||
ch (SCSI Media Changer)
|
||||
-----------------------
|
||||
|
||||
ch (ch.c)
|
||||
|
||||
SCSI mid layer
|
||||
==============
|
||||
|
||||
SCSI midlayer implementation
|
||||
----------------------------
|
||||
|
||||
include/scsi/scsi_device.h
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
.. kernel-doc:: include/scsi/scsi_device.h
|
||||
:internal:
|
||||
|
||||
drivers/scsi/scsi.c
|
||||
~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
Main file for the SCSI midlayer.
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsi.c
|
||||
:export:
|
||||
|
||||
drivers/scsi/scsicam.c
|
||||
~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
`SCSI Common Access
|
||||
Method <http://www.t10.org/ftp/t10/drafts/cam/cam-r12b.pdf>`__ support
|
||||
functions, for use with HDIO_GETGEO, etc.
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsicam.c
|
||||
:export:
|
||||
|
||||
drivers/scsi/scsi_error.c
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
Common SCSI error/timeout handling routines.
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsi_error.c
|
||||
:export:
|
||||
|
||||
drivers/scsi/scsi_devinfo.c
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
Manage scsi_dev_info_list, which tracks blacklisted and whitelisted
|
||||
devices.
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsi_devinfo.c
|
||||
:internal:
|
||||
|
||||
drivers/scsi/scsi_ioctl.c
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
Handle ioctl() calls for SCSI devices.
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsi_ioctl.c
|
||||
:export:
|
||||
|
||||
drivers/scsi/scsi_lib.c
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
SCSI queuing library.
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsi_lib.c
|
||||
:export:
|
||||
|
||||
drivers/scsi/scsi_lib_dma.c
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
SCSI library functions depending on DMA (map and unmap scatter-gather
|
||||
lists).
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsi_lib_dma.c
|
||||
:export:
|
||||
|
||||
drivers/scsi/scsi_module.c
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
The file drivers/scsi/scsi_module.c contains legacy support for
|
||||
old-style host templates. It should never be used by any new driver.
|
||||
|
||||
drivers/scsi/scsi_proc.c
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
The functions in this file provide an interface between the PROC file
|
||||
system and the SCSI device drivers It is mainly used for debugging,
|
||||
statistics and to pass information directly to the lowlevel driver. I.E.
|
||||
plumbing to manage /proc/scsi/\*
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsi_proc.c
|
||||
:internal:
|
||||
|
||||
drivers/scsi/scsi_netlink.c
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
Infrastructure to provide async events from transports to userspace via
|
||||
netlink, using a single NETLINK_SCSITRANSPORT protocol for all
|
||||
transports. See `the original patch
|
||||
submission <http://marc.info/?l=linux-scsi&m=115507374832500&w=2>`__ for
|
||||
more details.
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsi_netlink.c
|
||||
:internal:
|
||||
|
||||
drivers/scsi/scsi_scan.c
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
Scan a host to determine which (if any) devices are attached. The
|
||||
general scanning/probing algorithm is as follows, exceptions are made to
|
||||
it depending on device specific flags, compilation options, and global
|
||||
variable (boot or module load time) settings. A specific LUN is scanned
|
||||
via an INQUIRY command; if the LUN has a device attached, a scsi_device
|
||||
is allocated and setup for it. For every id of every channel on the
|
||||
given host, start by scanning LUN 0. Skip hosts that don't respond at
|
||||
all to a scan of LUN 0. Otherwise, if LUN 0 has a device attached,
|
||||
allocate and setup a scsi_device for it. If target is SCSI-3 or up,
|
||||
issue a REPORT LUN, and scan all of the LUNs returned by the REPORT LUN;
|
||||
else, sequentially scan LUNs up until some maximum is reached, or a LUN
|
||||
is seen that cannot have a device attached to it.
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsi_scan.c
|
||||
:internal:
|
||||
|
||||
drivers/scsi/scsi_sysctl.c
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
Set up the sysctl entry: "/dev/scsi/logging_level"
|
||||
(DEV_SCSI_LOGGING_LEVEL) which sets/returns scsi_logging_level.
|
||||
|
||||
drivers/scsi/scsi_sysfs.c
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
SCSI sysfs interface routines.
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsi_sysfs.c
|
||||
:export:
|
||||
|
||||
drivers/scsi/hosts.c
|
||||
~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
mid to lowlevel SCSI driver interface
|
||||
|
||||
.. kernel-doc:: drivers/scsi/hosts.c
|
||||
:export:
|
||||
|
||||
drivers/scsi/constants.c
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
mid to lowlevel SCSI driver interface
|
||||
|
||||
.. kernel-doc:: drivers/scsi/constants.c
|
||||
:export:
|
||||
|
||||
Transport classes
|
||||
-----------------
|
||||
|
||||
Transport classes are service libraries for drivers in the SCSI lower
|
||||
layer, which expose transport attributes in sysfs.
|
||||
|
||||
Fibre Channel transport
|
||||
~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
The file drivers/scsi/scsi_transport_fc.c defines transport attributes
|
||||
for Fibre Channel.
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsi_transport_fc.c
|
||||
:export:
|
||||
|
||||
iSCSI transport class
|
||||
~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
The file drivers/scsi/scsi_transport_iscsi.c defines transport
|
||||
attributes for the iSCSI class, which sends SCSI packets over TCP/IP
|
||||
connections.
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsi_transport_iscsi.c
|
||||
:export:
|
||||
|
||||
Serial Attached SCSI (SAS) transport class
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
The file drivers/scsi/scsi_transport_sas.c defines transport
|
||||
attributes for Serial Attached SCSI, a variant of SATA aimed at large
|
||||
high-end systems.
|
||||
|
||||
The SAS transport class contains common code to deal with SAS HBAs, an
|
||||
aproximated representation of SAS topologies in the driver model, and
|
||||
various sysfs attributes to expose these topologies and management
|
||||
interfaces to userspace.
|
||||
|
||||
In addition to the basic SCSI core objects this transport class
|
||||
introduces two additional intermediate objects: The SAS PHY as
|
||||
represented by struct sas_phy defines an "outgoing" PHY on a SAS HBA or
|
||||
Expander, and the SAS remote PHY represented by struct sas_rphy defines
|
||||
an "incoming" PHY on a SAS Expander or end device. Note that this is
|
||||
purely a software concept, the underlying hardware for a PHY and a
|
||||
remote PHY is the exactly the same.
|
||||
|
||||
There is no concept of a SAS port in this code, users can see what PHYs
|
||||
form a wide port based on the port_identifier attribute, which is the
|
||||
same for all PHYs in a port.
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsi_transport_sas.c
|
||||
:export:
|
||||
|
||||
SATA transport class
|
||||
~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
The SATA transport is handled by libata, which has its own book of
|
||||
documentation in this directory.
|
||||
|
||||
Parallel SCSI (SPI) transport class
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
The file drivers/scsi/scsi_transport_spi.c defines transport
|
||||
attributes for traditional (fast/wide/ultra) SCSI busses.
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsi_transport_spi.c
|
||||
:export:
|
||||
|
||||
SCSI RDMA (SRP) transport class
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
The file drivers/scsi/scsi_transport_srp.c defines transport
|
||||
attributes for SCSI over Remote Direct Memory Access.
|
||||
|
||||
.. kernel-doc:: drivers/scsi/scsi_transport_srp.c
|
||||
:export:
|
||||
|
||||
SCSI lower layer
|
||||
================
|
||||
|
||||
Host Bus Adapter transport types
|
||||
--------------------------------
|
||||
|
||||
Many modern device controllers use the SCSI command set as a protocol to
|
||||
communicate with their devices through many different types of physical
|
||||
connections.
|
||||
|
||||
In SCSI language a bus capable of carrying SCSI commands is called a
|
||||
"transport", and a controller connecting to such a bus is called a "host
|
||||
bus adapter" (HBA).
|
||||
|
||||
Debug transport
|
||||
~~~~~~~~~~~~~~~
|
||||
|
||||
The file drivers/scsi/scsi_debug.c simulates a host adapter with a
|
||||
variable number of disks (or disk like devices) attached, sharing a
|
||||
common amount of RAM. Does a lot of checking to make sure that we are
|
||||
not getting blocks mixed up, and panics the kernel if anything out of
|
||||
the ordinary is seen.
|
||||
|
||||
To be more realistic, the simulated devices have the transport
|
||||
attributes of SAS disks.
|
||||
|
||||
For documentation see http://sg.danny.cz/sg/sdebug26.html
|
||||
|
||||
todo
|
||||
~~~~
|
||||
|
||||
Parallel (fast/wide/ultra) SCSI, USB, SATA, SAS, Fibre Channel,
|
||||
FireWire, ATAPI devices, Infiniband, I20, iSCSI, Parallel ports,
|
||||
netlink...
|
||||
@ -170,10 +170,10 @@ This function is very timing critical. When you wish to simply discard
|
||||
data the support code provides the function
|
||||
:c:func:`z8530_null_rx()` to discard the data.
|
||||
|
||||
To active PIO mode sending and receiving the ``
|
||||
z8530_sync_open`` is called. This expects to be passed the network
|
||||
device and the channel. Typically this is called from your network
|
||||
device open callback. On a failure a non zero error status is returned.
|
||||
To active PIO mode sending and receiving the ``z8530_sync_open`` is called.
|
||||
This expects to be passed the network device and the channel. Typically
|
||||
this is called from your network device open callback. On a failure a
|
||||
non zero error status is returned.
|
||||
The :c:func:`z8530_sync_close()` function shuts down a PIO
|
||||
channel. This must be done before the channel is opened again and before
|
||||
the driver shuts down and unloads.
|
||||
@ -190,8 +190,7 @@ the close function matching the open mode you used.
|
||||
The final supported mode uses a single DMA channel to drive the transmit
|
||||
side. As the Z85C30 has a larger FIFO on the receive channel this tends
|
||||
to increase the maximum speed a little. This is activated by calling the
|
||||
``z8530_sync_txdma_open
|
||||
``. This returns a non zero error code on failure. The
|
||||
``z8530_sync_txdma_open``. This returns a non zero error code on failure. The
|
||||
:c:func:`z8530_sync_txdma_close()` function closes down the Z8530
|
||||
interface from this mode.
|
||||
|
||||
@ -228,8 +227,8 @@ Should you need to retarget the Z8530 driver to another architecture the
|
||||
only code that should need changing are the port I/O functions. At the
|
||||
moment these assume PC I/O port accesses. This may not be appropriate
|
||||
for all platforms. Replacing :c:func:`z8530_read_port()` and
|
||||
``z8530_write_port
|
||||
`` is intended to be all that is required to port this driver layer.
|
||||
``z8530_write_port`` is intended to be all that is required to port
|
||||
this driver layer.
|
||||
|
||||
Known Bugs And Assumptions
|
||||
==========================
|
||||
|
||||
Loading…
Reference in New Issue
Block a user