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47 lines
2.3 KiB
47 lines
2.3 KiB
.. SPDX-License-Identifier: GPL-2.0 |
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============================ |
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SCSI subsystem documentation |
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============================ |
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The Linux Documentation Project (LDP) maintains a document describing |
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the SCSI subsystem in the Linux kernel (lk) 2.4 series. See: |
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http://www.tldp.org/HOWTO/SCSI-2.4-HOWTO . The LDP has single |
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and multiple page HTML renderings as well as postscript and pdf. |
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It can also be found at: |
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http://web.archive.org/web/%2E/http://www.torque.net/scsi/SCSI-2.4-HOWTO |
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Notes on using modules in the SCSI subsystem |
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============================================ |
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The scsi support in the linux kernel can be modularized in a number of |
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different ways depending upon the needs of the end user. To understand |
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your options, we should first define a few terms. |
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The scsi-core (also known as the "mid level") contains the core of scsi |
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support. Without it you can do nothing with any of the other scsi drivers. |
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The scsi core support can be a module (scsi_mod.o), or it can be built into |
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the kernel. If the core is a module, it must be the first scsi module |
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loaded, and if you unload the modules, it will have to be the last one |
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unloaded. In practice the modprobe and rmmod commands (and "autoclean") |
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will enforce the correct ordering of loading and unloading modules in |
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the SCSI subsystem. |
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The individual upper and lower level drivers can be loaded in any order |
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once the scsi core is present in the kernel (either compiled in or loaded |
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as a module). The disk driver (sd_mod.o), cdrom driver (sr_mod.o), |
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tape driver [1]_ (st.o) and scsi generics driver (sg.o) represent the upper |
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level drivers to support the various assorted devices which can be |
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controlled. You can for example load the tape driver to use the tape drive, |
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and then unload it once you have no further need for the driver (and release |
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the associated memory). |
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The lower level drivers are the ones that support the individual cards that |
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are supported for the hardware platform that you are running under. Those |
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individual cards are often called Host Bus Adapters (HBAs). For example the |
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aic7xxx.o driver is used to control all recent SCSI controller cards from |
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Adaptec. Almost all lower level drivers can be built either as modules or |
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built into the kernel. |
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.. [1] There is a variant of the st driver for controlling OnStream tape |
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devices. Its module name is osst.o . |
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