450 lines
21 KiB
Text
450 lines
21 KiB
Text
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The tmscsim driver
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==================
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1. Purpose and history
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2. Installation
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3. Features
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4. Configuration via /proc/scsi/tmscsim/?
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5. Configuration via boot/module params
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6. Potential improvements
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7. Bug reports, debugging and updates
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8. Acknowledgements
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9. Copyright
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1. Purpose and history
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----------------------
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The tmscsim driver supports PCI SCSI Host Adapters based on the AM53C974
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chip. AM53C974 based SCSI adapters include:
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Tekram DC390, DC390T
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Dawicontrol 2974
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QLogic Fast! PCI Basic
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some on-board adapters
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(This is most probably not a complete list)
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It has originally written by C.L. Huang from the Tekram corp. to support the
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Tekram DC390(T) adapter. This is where the name comes from: tm = Tekram
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scsi = SCSI driver, m = AMD (?) as opposed to w for the DC390W/U/F
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(NCR53c8X5, X=2/7) driver. Yes, there was also a driver for the latter,
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tmscsiw, which supported DC390W/U/F adapters. It's not maintained any more,
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as the ncr53c8xx is perfectly supporting these adpaters since some time.
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The driver first appeared in April 1996, exclusively supported the DC390
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and has been enhanced since then in various steps. In May 1998 support for
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general AM53C974 based adapters and some possibilities to configure it were
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added. The non-DC390 support works by assuming some values for the data
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normally taken from the DC390 EEPROM. See below (chapter 5) for details.
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When using the DC390, the configuration is still be done using the DC390
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BIOS setup. The DC390 EEPROM is read and used by the driver, any boot or
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module parameters (chapter 5) are ignored! However, you can change settings
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dynamically, as described in chapter 4.
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For a more detailed description of the driver's history, see the first lines
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of tmscsim.c.
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The numbering scheme isn't consistent. The first versions went from 1.00 to
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1.12, then 1.20a to 1.20t. Finally I decided to use the ncr53c8xx scheme. So
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the next revisions will be 2.0a to 2.0X (stable), 2.1a to 2.1X (experimental),
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2.2a to 2.2X (stable, again) etc. (X = anything between a and z.) If I send
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fixes to people for testing, I create intermediate versions with a digit
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appended, e.g. 2.0c3.
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2. Installation
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---------------
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If you got any recent kernel with this driver and document included in
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linux/drivers/scsi, you basically have to do nothing special to use this
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driver. Of course you have to choose to compile SCSI support and DC390(T)
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support into your kernel or as module when configuring your kernel for
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compiling.
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NEW: You may as well compile this module outside your kernel, using the
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supplied Makefile.
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If you got an old kernel (pre 2.1.127, pre 2.0.37p1) with an old version of
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this driver: Get dc390-21125-20b.diff.gz or dc390-2036p21-20b1.diff.gz from
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my web page and apply the patch. Apply further patches to upgrade to the
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latest version of the driver.
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If you want to do it manually, you should copy the files (dc390.h,
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tmscsim.h, tmscsim.c, scsiiom.c and README.tmscsim) from this directory to
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linux/drivers/scsi. You have to recompile your kernel/module of course.
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You should apply the three patches included in dc390-120-kernel.diff
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(Applying them: cd /usr/src; patch -p0 <~/dc390-120-kernel.diff)
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The patches are against 2.1.125, so you might have to manually resolve
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rejections when applying to another kernel version.
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The patches will update the kernel startup code to allow boot parameters to
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be passed to the driver, update the Documentation and finally offer you the
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possibility to omit the non-DC390 parts of the driver.
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(By selecting "Omit support for non DC390" you basically disable the
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emulation of a DC390 EEPROM for non DC390 adapters. This saves a few bytes
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of memory.)
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If you got a very old kernel without the tmscsim driver (pre 2.0.31)
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I recommend upgrading your kernel. However, if you don't want to, please
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contact me to get the appropriate patches.
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Upgrading a SCSI driver is always a delicate thing to do. The 2.0 driver has
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proven stable on many systems, but it's still a good idea to take some
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precautions. In an ideal world you would have a full backup of your disks.
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The world isn't ideal and most people don't have full backups (me neither).
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So take at least the following measures:
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* make your kernel remount the FS read-only on detecting an error:
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tune2fs -e remount-ro /dev/sd??
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* have copies of your SCSI disk's partition tables on some safe location:
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dd if=/dev/sda of=/mnt/floppy/sda bs=512 count=1
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or just print it with:
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fdisk -l | lpr
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* make sure you are able to boot Linux (e.g. from floppy disk using InitRD)
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if your SCSI disk gets corrupted. You can use
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ftp://student.physik.uni-dortmund.de/pub/linux/kernel/bootdisk.gz
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One more warning: I used to overclock my PCI bus to 41.67 MHz. My Tekram
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DC390F (Sym53c875) accepted this as well as my Millenium. But the Am53C974
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produced errors and started to corrupt my disks. So don't do that! A 37.50
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MHz PCI bus works for me, though, but I don't recommend using higher clocks
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than the 33.33 MHz being in the PCI spec.
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If you want to share the IRQ with another device and the driver refuses to
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do so, you might succeed with changing the DC390_IRQ type in tmscsim.c to
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SA_SHIRQ | SA_INTERRUPT.
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3.Features
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----------
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- SCSI
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* Tagged command queueing
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* Sync speed up to 10 MHz
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* Disconnection
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* Multiple LUNs
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- General / Linux interface
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* Support for up to 4 AM53C974 adapters.
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* DC390 EEPROM usage or boot/module params
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* Information via cat /proc/scsi/tmscsim/?
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* Dynamically configurable by writing to /proc/scsi/tmscsim/?
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* Dynamic allocation of resources
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* SMP support: Locking on io_request lock (Linux 2.1/2.2) or adapter
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specific locks (Linux 2.5?)
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* Uniform source code for Linux-2.x.y
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* Support for dyn. addition/removal of devices via add/remove-single-device
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(Try: echo "scsi add-single-device C B T U" >/proc/scsi/scsi
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C = Controller, B = Bus, T = Target SCSI ID, U = Unit SCSI LUN.)
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Use with care!
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* Try to use the partition table for the determination of the mapping
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4. Configuration via /proc/scsi/tmscsim/?
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-----------------------------------------
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First of all look at the output of /proc/scsi/tmscsim/? by typing
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cat /proc/scsi/tmscsim/?
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The "?" should be replaced by the SCSI host number. (The shell might do this
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for you.)
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You will see some info regarding the adapter and, at the end, a listing of
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the attached devices and their settings.
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Here's an example:
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garloff@kurt:/home/garloff > cat /proc/scsi/tmscsim/0
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Tekram DC390/AM53C974 PCI SCSI Host Adapter, Driver Version 2.0e7 2000-11-28
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SCSI Host Nr 1, AM53C974 Adapter Nr 0
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IOPortBase 0xb000, IRQ 10
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MaxID 8, MaxLUN 8, AdapterID 6, SelTimeout 250 ms, DelayReset 1 s
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TagMaxNum 16, Status 0x00, ACBFlag 0x00, GlitchEater 24 ns
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Statistics: Cmnds 1470165, Cmnds not sent directly 0, Out of SRB conds 0
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Lost arbitrations 587, Sel. connected 0, Connected: No
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Nr of attached devices: 4, Nr of DCBs: 4
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Map of attached LUNs: 01 00 00 03 01 00 00 00
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Idx ID LUN Prty Sync DsCn SndS TagQ NegoPeriod SyncSpeed SyncOffs MaxCmd
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00 00 00 Yes Yes Yes Yes Yes 100 ns 10.0 M 15 16
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01 03 00 Yes Yes Yes Yes No 100 ns 10.0 M 15 01
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02 03 01 Yes Yes Yes Yes No 100 ns 10.0 M 15 01
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03 04 00 Yes Yes Yes Yes No 100 ns 10.0 M 15 01
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Note that the settings MaxID and MaxLUN are not zero- but one-based, which
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means that a setting MaxLUN=4, will result in the support of LUNs 0..3. This
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is somehow inconvenient, but the way the mid-level SCSI code expects it to be.
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ACB and DCB are acronyms for Adapter Control Block and Device Control Block.
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These are data structures of the driver containing information about the
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adapter and the connected SCSI devices respectively.
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Idx is the device index (just a consecutive number for the driver), ID and
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LUN are the SCSI ID and LUN, Prty means Parity checking, Sync synchronous
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negotiation, DsCn Disconnection, SndS Send Start command on startup (not
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used by the driver) and TagQ Tagged Command Queueing. NegoPeriod and
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SyncSpeed are somehow redundant, because they are reciprocal values
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(1 / 112 ns = 8.9 MHz). At least in theory. The driver is able to adjust the
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NegoPeriod more accurate (4ns) than the SyncSpeed (1 / 25ns). I don't know
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if certain devices will have problems with this discrepancy. Max. speed is
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10 MHz corresp. to a min. NegoPeriod of 100 ns.
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(The driver allows slightly higher speeds if the devices (Ultra SCSI) accept
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it, but that's out of adapter spec, on your own risk and unlikely to improve
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performance. You're likely to crash your disks.)
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SyncOffs is the offset used for synchronous negotiations; max. is 15.
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The last values are only shown, if Sync is enabled. (NegoPeriod is still
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displayed in brackets to show the values which will be used after enabling
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Sync.)
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MaxCmd ist the number of commands (=tags) which can be processed at the same
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time by the device.
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If you want to change a setting, you can do that by writing to
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/proc/scsi/tmscsim/?. Basically you have to imitate the output of driver.
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(Don't use the brackets for NegoPeriod on Sync disabled devices.)
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You don't have to care about capitalisation. The driver will accept space,
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tab, comma, = and : as separators.
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There are three kinds of changes:
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(1) Change driver settings:
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You type the names of the parameters and the params following it.
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Example:
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echo "MaxLUN=8 seltimeout 200" >/proc/scsi/tmscsim/0
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Note that you can only change MaxID, MaxLUN, AdapterID, SelTimeOut,
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TagMaxNum, ACBFlag, GlitchEater and DelayReset. Don't change ACBFlag
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unless you want to see what happens, if the driver hangs.
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(2) Change device settings: You write a config line to the driver. The Nr
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must match the ID and LUN given. If you give "-" as parameter, it is
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ignored and the corresponding setting won't be changed.
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You can use "y" or "n" instead of "Yes" and "No" if you want to.
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You don't need to specify a full line. The driver automatically performs
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an INQUIRY on the device if necessary to check if it is capable to operate
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with the given settings (Sync, TagQ).
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Examples:
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echo "0 0 0 y y y - y - 10 " >/proc/scsi/tmscsim/0
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echo "3 5 0 y n y " >/proc/scsi/tmscsim/0
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To give a short explanation of the first example:
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The first three numbers, "0 0 0" (Device index 0, SCSI ID 0, SCSI LUN 0),
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select the device to which the following parameters apply. Note that it
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would be sufficient to use the index or both SCSI ID and LUN, but I chose
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to require all three to have a syntax similar to the output.
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The following "y y y - y" enables Parity checking, enables Synchronous
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transfers, Disconnection, leaves Send Start (not used) untouched and
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enables Tagged Command Queueing for the selected device. The "-" skips
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the Negotiation Period setting but the "10" sets the max sync. speed to
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10 MHz. It's useless to specify both NegoPeriod and SyncSpeed as
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discussed above. The values used in this example will result in maximum
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performance.
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(3) Special commands: You can force a SCSI bus reset, an INQUIRY command, the
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removal or the addition of a device's DCB and a SCSI register dump.
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This is only used for debugging when you meet problems. The parameter of
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the INQUIRY and REMOVE commands is the device index as shown by the
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output of /proc/scsi/tmscsim/? in the device listing in the first column
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(Idx). ADD takes the SCSI ID and LUN.
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Examples:
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echo "reset" >/proc/scsi/tmscsim/0
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echo "inquiry 1" >/proc/scsi/tmscsim/0
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echo "remove 2" >/proc/scsi/tmscsim/1
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echo "add 2 3" >/proc/scsi/tmscsim/?
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echo "dump" >/proc/scsi/tmscsim/0
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Note that you will meet problems when you REMOVE a device's DCB with the
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remove command if it contains partitions which are mounted. Only use it
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after unmounting its partitions, telling the SCSI mid-level code to
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remove it (scsi remove-single-device) and you really need a few bytes of
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memory.
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The ADD command allows you to configure a device before you tell the
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mid-level code to try detection.
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I'd suggest reviewing the output of /proc/scsi/tmscsim/? after changing
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settings to see if everything changed as requested.
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5. Configuration via boot/module parameters
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-------------------------------------------
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With the DC390, the driver reads its EEPROM settings and tries to use them.
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But you may want to override the settings prior to being able to change the
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driver configuration via /proc/scsi/tmscsim/?.
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If you do have another AM53C974 based adapter, that's even the only
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possibility to adjust settings before you are able to write to the
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/proc/scsi/tmscsim/? pseudo-file, e.g. if you want to use another
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adapter ID than 7.
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(BTW, the log message "DC390: No EEPROM found!" is normal without a DC390.)
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For this purpose, you can pass options to the driver before it is initialised
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by using kernel or module parameters. See lilo(8) or modprobe(1) manual
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pages on how to pass params to the kernel or a module.
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[NOTE: Formerly, it was not possible to override the EEPROM supplied
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settings of the DC390 with cmd line parameters. This has changed since
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2.0e7]
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The syntax of the params is much shorter than the syntax of the /proc/...
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interface. This makes it a little bit more difficult to use. However, long
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parameter lines have the risk to be misinterpreted and the length of kernel
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parameters is limited.
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As the support for non-DC390 adapters works by simulating the values of the
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DC390 EEPROM, the settings are given in a DC390 BIOS' way.
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Here's the syntax:
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tmscsim=AdaptID,SpdIdx,DevMode,AdaptMode,TaggedCmnds,DelayReset
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Each of the parameters is a number, containing the described information:
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* AdaptID: The SCSI ID of the host adapter. Must be in the range 0..7
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Default is 7.
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* SpdIdx: The index of the maximum speed as in the DC390 BIOS. The values
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0..7 mean 10, 8.0, 6.7, 5.7, 5.0, 4.0, 3.1 and 2 MHz resp. Default is
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0 (10.0 MHz).
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* DevMode is a bit mapped value describing the per-device features. It
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applies to all devices. (Sync, Disc and TagQ will only apply, if the
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device supports it.) The meaning of the bits (* = default):
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Bit Val(hex) Val(dec) Meaning
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*0 0x01 1 Parity check
|
|||
|
|
*1 0x02 2 Synchronous Negotiation
|
|||
|
|
*2 0x04 4 Disconnection
|
|||
|
|
*3 0x08 8 Send Start command on startup. (Not used)
|
|||
|
|
*4 0x10 16 Tagged Command Queueing
|
|||
|
|
|
|||
|
|
As usual, the desired value is obtained by adding the wanted values. If
|
|||
|
|
you want to enable all values, e.g., you would use 31(0x1f). Default is 31.
|
|||
|
|
|
|||
|
|
* AdaptMode is a bit mapped value describing the enabled adapter features.
|
|||
|
|
|
|||
|
|
Bit Val(hex) Val(dec) Meaning
|
|||
|
|
*0 0x01 1 Support more than two drives. (Not used)
|
|||
|
|
*1 0x02 2 Use DOS compatible mapping for HDs greater than 1GB.
|
|||
|
|
*2 0x04 4 Reset SCSI Bus on startup.
|
|||
|
|
*3 0x08 8 Active Negation: Improves SCSI Bus noise immunity.
|
|||
|
|
4 0x10 16 Immediate return on BIOS seek command. (Not used)
|
|||
|
|
(*)5 0x20 32 Check for LUNs >= 1.
|
|||
|
|
|
|||
|
|
The default for LUN Check depends on CONFIG_SCSI_MULTI_LUN.
|
|||
|
|
|
|||
|
|
* TaggedCmnds is a number indicating the maximum number of Tagged Commands.
|
|||
|
|
It is the binary logarithm - 1 of the actual number. Max is 4 (32).
|
|||
|
|
Value Number of Tagged Commands
|
|||
|
|
0 2
|
|||
|
|
1 4
|
|||
|
|
2 8
|
|||
|
|
*3 16
|
|||
|
|
4 32
|
|||
|
|
|
|||
|
|
* DelayReset is the time in seconds (minus 0.5s), the adapter waits, after a
|
|||
|
|
bus reset. Default is 1 (corresp. to 1.5s).
|
|||
|
|
|
|||
|
|
Example:
|
|||
|
|
modprobe tmscsim tmscsim=6,2,31
|
|||
|
|
would set the adapter ID to 6, max. speed to 6.7 MHz, enable all device
|
|||
|
|
features and leave the adapter features, the number of Tagged Commands
|
|||
|
|
and the Delay after a reset to the defaults.
|
|||
|
|
|
|||
|
|
As you can see, you don't need to specify all of the six params.
|
|||
|
|
If you want values to be ignored (i.e. the EEprom settings or the defaults
|
|||
|
|
will be used), you may pass -2 (not 0!) at the corresponding position.
|
|||
|
|
|
|||
|
|
The defaults (7,0,31,15,3,1) are aggressive to allow good performance. You
|
|||
|
|
can use tmscsim=7,0,31,63,4,0 for maximum performance, if your SCSI chain
|
|||
|
|
allows it. If you meet problems, you can use tmscsim=-1 which is a shortcut
|
|||
|
|
for tmscsim=7,4,9,15,2,10.
|
|||
|
|
|
|||
|
|
|
|||
|
|
6. Potential improvements
|
|||
|
|
-------------------------
|
|||
|
|
Most of the intended work on the driver has been done. Here are a few ideas
|
|||
|
|
to further improve its usability:
|
|||
|
|
|
|||
|
|
* Cleanly separate per-Target and per-LUN properties (DCB)
|
|||
|
|
* More intelligent abort() routine
|
|||
|
|
* Use new_eh code (Linux-2.1+)
|
|||
|
|
* Have the mid-level (ML) code (and not the driver) handle more of the
|
|||
|
|
various conditions.
|
|||
|
|
* Command queueing in the driver: Eliminate Query list and use ML instead.
|
|||
|
|
* More user friendly boot/module param syntax
|
|||
|
|
|
|||
|
|
Further investigation on these problems:
|
|||
|
|
|
|||
|
|
* Driver hangs with sync readcdda (xcdroast) (most probably VIA PCI error)
|
|||
|
|
|
|||
|
|
Known problems:
|
|||
|
|
Please see http://www.garloff.de/kurt/linux/dc390/problems.html
|
|||
|
|
|
|||
|
|
* Changing the parameters of multi-lun by the tmscsim/? interface will
|
|||
|
|
cause problems, cause these settings are mostly per Target and not per LUN
|
|||
|
|
and should be updated accordingly. To be fixed for 2.0d24.
|
|||
|
|
* CDRs (eg Yam CRW4416) not recognized, because some buggy devices don't
|
|||
|
|
recover from a SCSI reset in time. Use a higher delay or don't issue
|
|||
|
|
a SCSI bus reset on driver initialization. See problems page.
|
|||
|
|
For the CRW4416S, this seems to be solved with firmware 1.0g (reported by
|
|||
|
|
Jean-Yves Barbier).
|
|||
|
|
* TEAC CD-532S not being recognized. (Works with 1.11).
|
|||
|
|
* Scanners (eg. Astra UMAX 1220S) don't work: Disable Sync Negotiation.
|
|||
|
|
If this does not help, try echo "INQUIRY t" >/proc/scsi/tmscsim/? (t
|
|||
|
|
replaced by the dev index of your scanner). You may try to reset your SCSI
|
|||
|
|
bus afterwards (echo "RESET" >/proc/scsi/tmscsim/?).
|
|||
|
|
The problem seems to be solved as of 2.0d18, thanks to Andreas Rick.
|
|||
|
|
* If there is a valid partition table, the driver will use it for determing
|
|||
|
|
the mapping. If there's none, a reasonable mapping (Symbios-like) will be
|
|||
|
|
assumed. Other operating systems may not like this mapping, though
|
|||
|
|
it's consistent with the BIOS' behaviour. Old DC390 drivers ignored the
|
|||
|
|
partition table and used a H/S = 64/32 or 255/63 translation. So if you
|
|||
|
|
want to be compatible to those, use this old mapping when creating
|
|||
|
|
partition tables. Even worse, on bootup the DC390 might complain if other
|
|||
|
|
mappings are found, so auto rebooting may fail.
|
|||
|
|
* In some situations, the driver will get stuck in an abort loop. This is a
|
|||
|
|
bad interaction between the Mid-Layer of Linux' SCSI code and the driver.
|
|||
|
|
Try to disable DsCn, if you meet this problem. Please contact me for
|
|||
|
|
further debugging.
|
|||
|
|
|
|||
|
|
|
|||
|
|
7. Bug reports, debugging and updates
|
|||
|
|
-------------------------------------
|
|||
|
|
Whenever you have problems with the driver, you are invited to ask the
|
|||
|
|
author for help. However, I'd suggest reading the docs and trying to solve
|
|||
|
|
the problem yourself, first.
|
|||
|
|
If you find something, which you believe to be a bug, please report it to me.
|
|||
|
|
Please append the output of /proc/scsi/scsi, /proc/scsi/tmscsim/? and
|
|||
|
|
maybe the DC390 log messages to the report.
|
|||
|
|
|
|||
|
|
Bug reports should be send to me (Kurt Garloff <dc390@garloff.de>) as well
|
|||
|
|
as to the linux-scsi list (<linux-scsi@vger.kernel.org>), as sometimes bugs
|
|||
|
|
are caused by the SCSI mid-level code.
|
|||
|
|
|
|||
|
|
I will ask you for some more details and probably I will also ask you to
|
|||
|
|
enable some of the DEBUG options in the driver (tmscsim.c:DC390_DEBUGXXX
|
|||
|
|
defines). The driver will produce some data for the syslog facility then.
|
|||
|
|
Beware: If your syslog gets written to a SCSI disk connected to your
|
|||
|
|
AM53C974, the logging might produce log output again, and you might end
|
|||
|
|
having your box spending most of its time doing the logging.
|
|||
|
|
|
|||
|
|
The latest version of the driver can be found at:
|
|||
|
|
http://www.garloff.de/kurt/linux/dc390/
|
|||
|
|
ftp://ftp.suse.com/pub/people/garloff/linux/dc390/
|
|||
|
|
|
|||
|
|
|
|||
|
|
8. Acknowledgements
|
|||
|
|
-------------------
|
|||
|
|
Thanks to Linus Torvalds, Alan Cox, the FSF people, the XFree86 team and
|
|||
|
|
all the others for the wonderful OS and software.
|
|||
|
|
Thanks to C.L. Huang and Philip Giang (Tekram) for the initial driver
|
|||
|
|
release and support.
|
|||
|
|
Thanks to Doug Ledford, G<>rard Roudier for support with SCSI coding.
|
|||
|
|
Thanks to a lot of people (espec. Chiaki Ishikawa, Andreas Haumer, Hubert
|
|||
|
|
Tonneau) for intensively testing the driver (and even risking data loss
|
|||
|
|
doing this during early revisions).
|
|||
|
|
Recently, SuSE GmbH, Nuernberg, FRG, has been paying me for the driver
|
|||
|
|
development and maintenance. Special thanks!
|
|||
|
|
|
|||
|
|
|
|||
|
|
9. Copyright
|
|||
|
|
------------
|
|||
|
|
This driver is free software; you can redistribute it and/or modify
|
|||
|
|
it under the terms of the GNU General Public License as published by
|
|||
|
|
the Free Software Foundation; version 2 of the License.
|
|||
|
|
If you want to use any later version of the GNU GPL, you will probably
|
|||
|
|
be allowed to, but you have to ask me and Tekram <erich@tekram.com.tw>
|
|||
|
|
before.
|
|||
|
|
|
|||
|
|
-------------------------------------------------------------------------
|
|||
|
|
Written by Kurt Garloff <kurt@garloff.de> 1998/06/11
|
|||
|
|
Last updated 2000/11/28, driver revision 2.0e7
|
|||
|
|
$Id: README.tmscsim,v 2.25.2.7 2000/12/20 01:07:12 garloff Exp $
|