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.. SPDX-License-Identifier: GPL-2.0
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=========================================================
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BusLogic MultiMaster and FlashPoint SCSI Driver for Linux
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=========================================================
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Version 2.0.15 for Linux 2.0
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Version 2.1.15 for Linux 2.1
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PRODUCTION RELEASE
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17 August 1998
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Leonard N. Zubkoff
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Dandelion Digital
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lnz@dandelion.com
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Copyright 1995-1998 by Leonard N. Zubkoff <lnz@dandelion.com>
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Introduction
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============
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BusLogic, Inc. designed and manufactured a variety of high performance SCSI
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host adapters which share a common programming interface across a diverse
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collection of bus architectures by virtue of their MultiMaster ASIC technology.
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BusLogic was acquired by Mylex Corporation in February 1996, but the products
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supported by this driver originated under the BusLogic name and so that name is
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retained in the source code and documentation.
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This driver supports all present BusLogic MultiMaster Host Adapters, and should
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support any future MultiMaster designs with little or no modification. More
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recently, BusLogic introduced the FlashPoint Host Adapters, which are less
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costly and rely on the host CPU, rather than including an onboard processor.
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Despite not having an onboard CPU, the FlashPoint Host Adapters perform very
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well and have very low command latency. BusLogic has recently provided me with
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the FlashPoint Driver Developer's Kit, which comprises documentation and freely
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redistributable source code for the FlashPoint SCCB Manager. The SCCB Manager
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is the library of code that runs on the host CPU and performs functions
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analogous to the firmware on the MultiMaster Host Adapters. Thanks to their
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having provided the SCCB Manager, this driver now supports the FlashPoint Host
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Adapters as well.
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My primary goals in writing this completely new BusLogic driver for Linux are
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to achieve the full performance that BusLogic SCSI Host Adapters and modern
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SCSI peripherals are capable of, and to provide a highly robust driver that can
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be depended upon for high performance mission critical applications. All of
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the major performance features can be configured from the Linux kernel command
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line or at module initialization time, allowing individual installations to
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tune driver performance and error recovery to their particular needs.
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The latest information on Linux support for BusLogic SCSI Host Adapters, as
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well as the most recent release of this driver and the latest firmware for the
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BT-948/958/958D, will always be available from my Linux Home Page at URL
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"http://sourceforge.net/projects/dandelion/".
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Bug reports should be sent via electronic mail to "lnz@dandelion.com". Please
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include with the bug report the complete configuration messages reported by the
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driver and SCSI subsystem at startup, along with any subsequent system messages
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relevant to SCSI operations, and a detailed description of your system's
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hardware configuration.
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Mylex has been an excellent company to work with and I highly recommend their
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products to the Linux community. In November 1995, I was offered the
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opportunity to become a beta test site for their latest MultiMaster product,
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the BT-948 PCI Ultra SCSI Host Adapter, and then again for the BT-958 PCI Wide
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Ultra SCSI Host Adapter in January 1996. This was mutually beneficial since
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Mylex received a degree and kind of testing that their own testing group cannot
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readily achieve, and the Linux community has available high performance host
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adapters that have been well tested with Linux even before being brought to
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market. This relationship has also given me the opportunity to interact
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directly with their technical staff, to understand more about the internal
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workings of their products, and in turn to educate them about the needs and
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potential of the Linux community.
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More recently, Mylex has reaffirmed the company's interest in supporting the
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Linux community, and I am now working on a Linux driver for the DAC960 PCI RAID
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Controllers. Mylex's interest and support is greatly appreciated.
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Unlike some other vendors, if you contact Mylex Technical Support with a
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problem and are running Linux, they will not tell you that your use of their
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products is unsupported. Their latest product marketing literature even states
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"Mylex SCSI host adapters are compatible with all major operating systems
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including: ... Linux ...".
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Mylex Corporation is located at 34551 Ardenwood Blvd., Fremont, California
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94555, USA and can be reached at 510/796-6100 or on the World Wide Web at
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http://www.mylex.com. Mylex HBA Technical Support can be reached by electronic
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mail at techsup@mylex.com, by Voice at 510/608-2400, or by FAX at 510/745-7715.
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Contact information for offices in Europe and Japan is available on the Web
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site.
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Driver Features
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===============
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Configuration Reporting and Testing
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-----------------------------------
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During system initialization, the driver reports extensively on the host
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adapter hardware configuration, including the synchronous transfer parameters
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requested and negotiated with each target device. AutoSCSI settings for
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Synchronous Negotiation, Wide Negotiation, and Disconnect/Reconnect are
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reported for each target device, as well as the status of Tagged Queuing.
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If the same setting is in effect for all target devices, then a single word
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or phrase is used; otherwise, a letter is provided for each target device to
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indicate the individual status. The following examples
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should clarify this reporting format:
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Synchronous Negotiation: Ultra
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Synchronous negotiation is enabled for all target devices and the host
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adapter will attempt to negotiate for 20.0 mega-transfers/second.
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Synchronous Negotiation: Fast
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Synchronous negotiation is enabled for all target devices and the host
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adapter will attempt to negotiate for 10.0 mega-transfers/second.
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Synchronous Negotiation: Slow
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Synchronous negotiation is enabled for all target devices and the host
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adapter will attempt to negotiate for 5.0 mega-transfers/second.
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Synchronous Negotiation: Disabled
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Synchronous negotiation is disabled and all target devices are limited to
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asynchronous operation.
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Synchronous Negotiation: UFSNUUU#UUUUUUUU
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Synchronous negotiation to Ultra speed is enabled for target devices 0
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and 4 through 15, to Fast speed for target device 1, to Slow speed for
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target device 2, and is not permitted to target device 3. The host
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adapter's SCSI ID is represented by the "#".
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The status of Wide Negotiation, Disconnect/Reconnect, and Tagged Queuing
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are reported as "Enabled", Disabled", or a sequence of "Y" and "N" letters.
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Performance Features
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--------------------
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BusLogic SCSI Host Adapters directly implement SCSI-2 Tagged Queuing, and so
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support has been included in the driver to utilize tagged queuing with any
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target devices that report having the tagged queuing capability. Tagged
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queuing allows for multiple outstanding commands to be issued to each target
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device or logical unit, and can improve I/O performance substantially. In
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addition, BusLogic's Strict Round Robin Mode is used to optimize host adapter
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performance, and scatter/gather I/O can support as many segments as can be
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effectively utilized by the Linux I/O subsystem. Control over the use of
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tagged queuing for each target device as well as individual selection of the
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tagged queue depth is available through driver options provided on the kernel
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command line or at module initialization time. By default, the queue depth
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is determined automatically based on the host adapter's total queue depth and
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the number, type, speed, and capabilities of the target devices found. In
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addition, tagged queuing is automatically disabled whenever the host adapter
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firmware version is known not to implement it correctly, or whenever a tagged
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queue depth of 1 is selected. Tagged queuing is also disabled for individual
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target devices if disconnect/reconnect is disabled for that device.
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Robustness Features
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-------------------
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The driver implements extensive error recovery procedures. When the higher
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level parts of the SCSI subsystem request that a timed out command be reset,
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a selection is made between a full host adapter hard reset and SCSI bus reset
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versus sending a bus device reset message to the individual target device
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based on the recommendation of the SCSI subsystem. Error recovery strategies
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are selectable through driver options individually for each target device,
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and also include sending a bus device reset to the specific target device
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associated with the command being reset, as well as suppressing error
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recovery entirely to avoid perturbing an improperly functioning device. If
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the bus device reset error recovery strategy is selected and sending a bus
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device reset does not restore correct operation, the next command that is
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reset will force a full host adapter hard reset and SCSI bus reset. SCSI bus
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resets caused by other devices and detected by the host adapter are also
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handled by issuing a soft reset to the host adapter and re-initialization.
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Finally, if tagged queuing is active and more than one command reset occurs
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in a 10 minute interval, or if a command reset occurs within the first 10
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minutes of operation, then tagged queuing will be disabled for that target
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device. These error recovery options improve overall system robustness by
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preventing individual errant devices from causing the system as a whole to
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lock up or crash, and thereby allowing a clean shutdown and restart after the
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offending component is removed.
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PCI Configuration Support
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-------------------------
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On PCI systems running kernels compiled with PCI BIOS support enabled, this
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driver will interrogate the PCI configuration space and use the I/O port
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addresses assigned by the system BIOS, rather than the ISA compatible I/O
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port addresses. The ISA compatible I/O port address is then disabled by the
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driver. On PCI systems it is also recommended that the AutoSCSI utility be
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used to disable the ISA compatible I/O port entirely as it is not necessary.
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The ISA compatible I/O port is disabled by default on the BT-948/958/958D.
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/proc File System Support
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-------------------------
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Copies of the host adapter configuration information together with updated
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data transfer and error recovery statistics are available through the
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/proc/scsi/BusLogic/<N> interface.
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Shared Interrupts Support
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-------------------------
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On systems that support shared interrupts, any number of BusLogic Host
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Adapters may share the same interrupt request channel.
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Supported Host Adapters
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=======================
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The following list comprises the supported BusLogic SCSI Host Adapters as of
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the date of this document. It is recommended that anyone purchasing a BusLogic
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Host Adapter not in the following table contact the author beforehand to verify
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that it is or will be supported.
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FlashPoint Series PCI Host Adapters:
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======================= =============================================
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FlashPoint LT (BT-930) Ultra SCSI-3
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FlashPoint LT (BT-930R) Ultra SCSI-3 with RAIDPlus
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FlashPoint LT (BT-920) Ultra SCSI-3 (BT-930 without BIOS)
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FlashPoint DL (BT-932) Dual Channel Ultra SCSI-3
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FlashPoint DL (BT-932R) Dual Channel Ultra SCSI-3 with RAIDPlus
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FlashPoint LW (BT-950) Wide Ultra SCSI-3
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FlashPoint LW (BT-950R) Wide Ultra SCSI-3 with RAIDPlus
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FlashPoint DW (BT-952) Dual Channel Wide Ultra SCSI-3
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FlashPoint DW (BT-952R) Dual Channel Wide Ultra SCSI-3 with RAIDPlus
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======================= =============================================
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MultiMaster "W" Series Host Adapters:
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======= === ==============================
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BT-948 PCI Ultra SCSI-3
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BT-958 PCI Wide Ultra SCSI-3
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BT-958D PCI Wide Differential Ultra SCSI-3
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======= === ==============================
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MultiMaster "C" Series Host Adapters:
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======== ==== ==============================
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BT-946C PCI Fast SCSI-2
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BT-956C PCI Wide Fast SCSI-2
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BT-956CD PCI Wide Differential Fast SCSI-2
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BT-445C VLB Fast SCSI-2
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BT-747C EISA Fast SCSI-2
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BT-757C EISA Wide Fast SCSI-2
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BT-757CD EISA Wide Differential Fast SCSI-2
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======== ==== ==============================
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MultiMaster "S" Series Host Adapters:
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======= ==== ==============================
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BT-445S VLB Fast SCSI-2
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BT-747S EISA Fast SCSI-2
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BT-747D EISA Differential Fast SCSI-2
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BT-757S EISA Wide Fast SCSI-2
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BT-757D EISA Wide Differential Fast SCSI-2
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BT-742A EISA SCSI-2 (742A revision H)
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======= ==== ==============================
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MultiMaster "A" Series Host Adapters:
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======= ==== ==============================
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BT-742A EISA SCSI-2 (742A revisions A - G)
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======= ==== ==============================
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AMI FastDisk Host Adapters that are true BusLogic MultiMaster clones are also
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supported by this driver.
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BusLogic SCSI Host Adapters are available packaged both as bare boards and as
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retail kits. The BT- model numbers above refer to the bare board packaging.
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The retail kit model numbers are found by replacing BT- with KT- in the above
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list. The retail kit includes the bare board and manual as well as cabling and
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driver media and documentation that are not provided with bare boards.
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FlashPoint Installation Notes
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=============================
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RAIDPlus Support
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----------------
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FlashPoint Host Adapters now include RAIDPlus, Mylex's bootable software
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RAID. RAIDPlus is not supported on Linux, and there are no plans to support
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it. The MD driver in Linux 2.0 provides for concatenation (LINEAR) and
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striping (RAID-0), and support for mirroring (RAID-1), fixed parity (RAID-4),
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and distributed parity (RAID-5) is available separately. The built-in Linux
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RAID support is generally more flexible and is expected to perform better
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than RAIDPlus, so there is little impetus to include RAIDPlus support in the
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BusLogic driver.
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Enabling UltraSCSI Transfers
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----------------------------
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FlashPoint Host Adapters ship with their configuration set to "Factory
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Default" settings that are conservative and do not allow for UltraSCSI speed
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to be negotiated. This results in fewer problems when these host adapters
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are installed in systems with cabling or termination that is not sufficient
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for UltraSCSI operation, or where existing SCSI devices do not properly
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respond to synchronous transfer negotiation for UltraSCSI speed. AutoSCSI
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may be used to load "Optimum Performance" settings which allow UltraSCSI
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speed to be negotiated with all devices, or UltraSCSI speed can be enabled on
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an individual basis. It is recommended that SCAM be manually disabled after
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the "Optimum Performance" settings are loaded.
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BT-948/958/958D Installation Notes
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==================================
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The BT-948/958/958D PCI Ultra SCSI Host Adapters have some features which may
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require attention in some circumstances when installing Linux.
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PCI I/O Port Assignments
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------------------------
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When configured to factory default settings, the BT-948/958/958D will only
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recognize the PCI I/O port assignments made by the motherboard's PCI BIOS.
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The BT-948/958/958D will not respond to any of the ISA compatible I/O ports
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that previous BusLogic SCSI Host Adapters respond to. This driver supports
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the PCI I/O port assignments, so this is the preferred configuration.
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However, if the obsolete BusLogic driver must be used for any reason, such as
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a Linux distribution that does not yet use this driver in its boot kernel,
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BusLogic has provided an AutoSCSI configuration option to enable a legacy ISA
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compatible I/O port.
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To enable this backward compatibility option, invoke the AutoSCSI utility via
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Ctrl-B at system startup and select "Adapter Configuration", "View/Modify
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Configuration", and then change the "ISA Compatible Port" setting from
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"Disable" to "Primary" or "Alternate". Once this driver has been installed,
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the "ISA Compatible Port" option should be set back to "Disable" to avoid
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possible future I/O port conflicts. The older BT-946C/956C/956CD also have
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this configuration option, but the factory default setting is "Primary".
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PCI Slot Scanning Order
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-----------------------
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In systems with multiple BusLogic PCI Host Adapters, the order in which the
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PCI slots are scanned may appear reversed with the BT-948/958/958D as
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compared to the BT-946C/956C/956CD. For booting from a SCSI disk to work
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correctly, it is necessary that the host adapter's BIOS and the kernel agree
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on which disk is the boot device, which requires that they recognize the PCI
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host adapters in the same order. The motherboard's PCI BIOS provides a
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standard way of enumerating the PCI host adapters, which is used by the Linux
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kernel. Some PCI BIOS implementations enumerate the PCI slots in order of
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increasing bus number and device number, while others do so in the opposite
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direction.
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Unfortunately, Microsoft decided that Windows 95 would always enumerate the
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PCI slots in order of increasing bus number and device number regardless of
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the PCI BIOS enumeration, and requires that their scheme be supported by the
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host adapter's BIOS to receive Windows 95 certification. Therefore, the
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factory default settings of the BT-948/958/958D enumerate the host adapters
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by increasing bus number and device number. To disable this feature, invoke
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the AutoSCSI utility via Ctrl-B at system startup and select "Adapter
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Configuration", "View/Modify Configuration", press Ctrl-F10, and then change
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the "Use Bus And Device # For PCI Scanning Seq." option to OFF.
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This driver will interrogate the setting of the PCI Scanning Sequence option
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so as to recognize the host adapters in the same order as they are enumerated
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by the host adapter's BIOS.
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Enabling UltraSCSI Transfers
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----------------------------
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The BT-948/958/958D ship with their configuration set to "Factory Default"
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settings that are conservative and do not allow for UltraSCSI speed to be
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negotiated. This results in fewer problems when these host adapters are
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installed in systems with cabling or termination that is not sufficient for
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UltraSCSI operation, or where existing SCSI devices do not properly respond
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to synchronous transfer negotiation for UltraSCSI speed. AutoSCSI may be
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used to load "Optimum Performance" settings which allow UltraSCSI speed to be
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negotiated with all devices, or UltraSCSI speed can be enabled on an
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individual basis. It is recommended that SCAM be manually disabled after the
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"Optimum Performance" settings are loaded.
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Driver Options
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==============
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BusLogic Driver Options may be specified either via the Linux Kernel Command
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Line or via the Loadable Kernel Module Installation Facility. Driver Options
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for multiple host adapters may be specified either by separating the option
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strings by a semicolon, or by specifying multiple "BusLogic=" strings on the
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command line. Individual option specifications for a single host adapter are
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separated by commas. The Probing and Debugging Options apply to all host
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adapters whereas the remaining options apply individually only to the
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selected host adapter.
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The BusLogic Driver Probing Options comprise the following:
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NoProbe
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The "NoProbe" option disables all probing and therefore no BusLogic Host
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Adapters will be detected.
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NoProbePCI
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The "NoProbePCI" options disables the interrogation of PCI Configuration
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Space and therefore only ISA Multimaster Host Adapters will be detected, as
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well as PCI Multimaster Host Adapters that have their ISA Compatible I/O
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Port set to "Primary" or "Alternate".
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NoSortPCI
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The "NoSortPCI" option forces PCI MultiMaster Host Adapters to be
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enumerated in the order provided by the PCI BIOS, ignoring any setting of
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the AutoSCSI "Use Bus And Device # For PCI Scanning Seq." option.
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MultiMasterFirst
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The "MultiMasterFirst" option forces MultiMaster Host Adapters to be probed
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before FlashPoint Host Adapters. By default, if both FlashPoint and PCI
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MultiMaster Host Adapters are present, this driver will probe for
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FlashPoint Host Adapters first unless the BIOS primary disk is controlled
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by the first PCI MultiMaster Host Adapter, in which case MultiMaster Host
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Adapters will be probed first.
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FlashPointFirst
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The "FlashPointFirst" option forces FlashPoint Host Adapters to be probed
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before MultiMaster Host Adapters.
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The BusLogic Driver Tagged Queuing Options allow for explicitly specifying
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the Queue Depth and whether Tagged Queuing is permitted for each Target
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Device (assuming that the Target Device supports Tagged Queuing). The Queue
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Depth is the number of SCSI Commands that are allowed to be concurrently
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presented for execution (either to the Host Adapter or Target Device). Note
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that explicitly enabling Tagged Queuing may lead to problems; the option to
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enable or disable Tagged Queuing is provided primarily to allow disabling
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Tagged Queuing on Target Devices that do not implement it correctly. The
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following options are available:
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QueueDepth:<integer>
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The "QueueDepth:" or QD:" option specifies the Queue Depth to use for all
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Target Devices that support Tagged Queuing, as well as the maximum Queue
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Depth for devices that do not support Tagged Queuing. If no Queue Depth
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option is provided, the Queue Depth will be determined automatically based
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on the Host Adapter's Total Queue Depth and the number, type, speed, and
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capabilities of the detected Target Devices. Target Devices that
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do not support Tagged Queuing always have their Queue Depth set to
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BusLogic_UntaggedQueueDepth or BusLogic_UntaggedQueueDepthBB, unless a
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lower Queue Depth option is provided. A Queue Depth of 1 automatically
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disables Tagged Queuing.
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QueueDepth:[<integer>,<integer>...]
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The "QueueDepth:[...]" or "QD:[...]" option specifies the Queue Depth
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individually for each Target Device. If an <integer> is omitted, the
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associated Target Device will have its Queue Depth selected automatically.
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TaggedQueuing:Default
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The "TaggedQueuing:Default" or "TQ:Default" option permits Tagged Queuing
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based on the firmware version of the BusLogic Host Adapter and based on
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whether the Queue Depth allows queuing multiple commands.
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TaggedQueuing:Enable
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The "TaggedQueuing:Enable" or "TQ:Enable" option enables Tagged Queuing for
|
|
all Target Devices on this Host Adapter, overriding any limitation that
|
|
would otherwise be imposed based on the Host Adapter firmware version.
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|
|
|
TaggedQueuing:Disable
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|
|
|
The "TaggedQueuing:Disable" or "TQ:Disable" option disables Tagged Queuing
|
|
for all Target Devices on this Host Adapter.
|
|
|
|
TaggedQueuing:<Target-Spec>
|
|
|
|
The "TaggedQueuing:<Target-Spec>" or "TQ:<Target-Spec>" option controls
|
|
Tagged Queuing individually for each Target Device. <Target-Spec> is a
|
|
sequence of "Y", "N", and "X" characters. "Y" enables Tagged Queuing, "N"
|
|
disables Tagged Queuing, and "X" accepts the default based on the firmware
|
|
version. The first character refers to Target Device 0, the second to
|
|
Target Device 1, and so on; if the sequence of "Y", "N", and "X" characters
|
|
does not cover all the Target Devices, unspecified characters are assumed
|
|
to be "X".
|
|
|
|
The BusLogic Driver Miscellaneous Options comprise the following:
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|
|
|
BusSettleTime:<seconds>
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|
|
|
The "BusSettleTime:" or "BST:" option specifies the Bus Settle Time in
|
|
seconds. The Bus Settle Time is the amount of time to wait between a Host
|
|
Adapter Hard Reset which initiates a SCSI Bus Reset and issuing any SCSI
|
|
Commands. If unspecified, it defaults to BusLogic_DefaultBusSettleTime.
|
|
|
|
InhibitTargetInquiry
|
|
|
|
The "InhibitTargetInquiry" option inhibits the execution of an Inquire
|
|
Target Devices or Inquire Installed Devices command on MultiMaster Host
|
|
Adapters. This may be necessary with some older Target Devices that do not
|
|
respond correctly when Logical Units above 0 are addressed.
|
|
|
|
The BusLogic Driver Debugging Options comprise the following:
|
|
|
|
TraceProbe
|
|
|
|
The "TraceProbe" option enables tracing of Host Adapter Probing.
|
|
|
|
TraceHardwareReset
|
|
|
|
The "TraceHardwareReset" option enables tracing of Host Adapter Hardware
|
|
Reset.
|
|
|
|
TraceConfiguration
|
|
|
|
The "TraceConfiguration" option enables tracing of Host Adapter
|
|
Configuration.
|
|
|
|
TraceErrors
|
|
|
|
The "TraceErrors" option enables tracing of SCSI Commands that return an
|
|
error from the Target Device. The CDB and Sense Data will be printed for
|
|
each SCSI Command that fails.
|
|
|
|
Debug
|
|
|
|
The "Debug" option enables all debugging options.
|
|
|
|
The following examples demonstrate setting the Queue Depth for Target Devices
|
|
1 and 2 on the first host adapter to 7 and 15, the Queue Depth for all Target
|
|
Devices on the second host adapter to 31, and the Bus Settle Time on the
|
|
second host adapter to 30 seconds.
|
|
|
|
Linux Kernel Command Line::
|
|
|
|
linux BusLogic=QueueDepth:[,7,15];QueueDepth:31,BusSettleTime:30
|
|
|
|
LILO Linux Boot Loader (in /etc/lilo.conf)::
|
|
|
|
append = "BusLogic=QueueDepth:[,7,15];QueueDepth:31,BusSettleTime:30"
|
|
|
|
INSMOD Loadable Kernel Module Installation Facility::
|
|
|
|
insmod BusLogic.o \
|
|
'BusLogic="QueueDepth:[,7,15];QueueDepth:31,BusSettleTime:30"'
|
|
|
|
|
|
.. Note::
|
|
|
|
Module Utilities 2.1.71 or later is required for correct parsing
|
|
of driver options containing commas.
|
|
|
|
|
|
Driver Installation
|
|
===================
|
|
|
|
This distribution was prepared for Linux kernel version 2.0.35, but should be
|
|
compatible with 2.0.4 or any later 2.0 series kernel.
|
|
|
|
To install the new BusLogic SCSI driver, you may use the following commands,
|
|
replacing "/usr/src" with wherever you keep your Linux kernel source tree::
|
|
|
|
cd /usr/src
|
|
tar -xvzf BusLogic-2.0.15.tar.gz
|
|
mv README.* LICENSE.* BusLogic.[ch] FlashPoint.c linux/drivers/scsi
|
|
patch -p0 < BusLogic.patch (only for 2.0.33 and below)
|
|
cd linux
|
|
make config
|
|
make zImage
|
|
|
|
Then install "arch/x86/boot/zImage" as your standard kernel, run lilo if
|
|
appropriate, and reboot.
|
|
|
|
|
|
BusLogic Announcements Mailing List
|
|
===================================
|
|
|
|
The BusLogic Announcements Mailing List provides a forum for informing Linux
|
|
users of new driver releases and other announcements regarding Linux support
|
|
for BusLogic SCSI Host Adapters. To join the mailing list, send a message to
|
|
"buslogic-announce-request@dandelion.com" with the line "subscribe" in the
|
|
message body.
|