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Name

fas - FAS SCSI Host Bus Adapter Driver

Synopsis

fas@sbus-slot,0x8800000

Availability

Sparc SBus-based systems with FAS366 based SCSI port and the SunSWIFT SBus SCSI adapter.

Description

The fas Host Bus Adapter driver is a SCSA compliant nexus driver that supports the Qlogic FAS366 SCSI chip.

The fas driver supports the standard functions provided by the SCSA interface. The driver supports tagged and untagged queuing, wide and fast SCSI , almost unlimited transfer size (using a moving DVMA window approach), and auto request sense; but it does not support linked commands.

Driver Configuration

The fas driver can be configured by defining properties in fas.conf which override the global SCSI settings. Supported properties are: scsi-options, target<n>-scsi-options, target<n>-sync-speed, target<n>-wide, target<n>-TQ, scsi-reset-delay, scsi-watchdog-tick, scsi-tag-age-limit, scsi-initiator-id.

target<n>-scsi-options overrides the scsi-options property value for target<n>.
<n> can vary from 0 to F. The supported scsi-options are: SCSI_OPTIONS_DR , SCSI_OPTIONS_SYNC , SCSI_OPTIONS_TAG , SCSI_OPTIONS_FAST , SCSI_OPTIONS_WIDE .

scsi-watchdog-tick is the periodic interval where the fas driver goes through all current and disconnected commands searching for timeouts.

scsi-tag-age-limit is the number of times that the fas driver attempts to allocate a particular tag ID that is currently in use after going through all tag IDs in a circular fashion. After finding the same tag ID in use scsi-tag-age-limit times, no more commands will be submitted to this target until all outstanding commands complete or timeout.

Refer to scsi_hba_attach(9F) for details.

Examples

Create a file /kernel/drv/fas.conf and add this line:

scsi-options=0x78;

This will disable tagged queuing, fast SCSI , and Wide mode for all fas instances. To disable an option for one specific fas (refer to driver.conf(4) ): 


 name="fas" parent="/iommu@f,e0000000/sbus@f,e0001000"
        reg=3,0x8800000,0x10,3,0x8810000,0x40
        target1-scsi-options=0x58
        scsi-options=0x178 scsi-initiator-id=6;

Note that the default initiator ID in OBP is 7 and that the change to ID 6 will occur at attach time. It may be preferable to change the initiator ID in OBP.

The above would set scsi-options for target 1 to 0x58 and all other targets on this SCSI bus to 0x178.

The physical pathname of the parent can be determined using the /devices tree or following the link of the logical device name: 


 # ls -l /dev/rdsk/c1t3d0s0
 lrwxrwxrwx 1 root  other  78 Aug 28 16:05 /dev/rdsk/c1t3d0s0 ->
 ../../devices/iommu@f,e0000000/sbus@f,e0001000/SUNW,fas@3,8800000/sd@3,0:a,raw

The register property values can be determined from prtconf(1M) output (-v option): 


            SUNW,fas, instance #0
                 ....
                Register Specifications:
                    Bus Type=0x3, Address=0x8800000, Size=10
                    Bus Type=0x3, Address=0x8810000, Size=40

Driver Capabilities

The target driver needs to set capabilities in the fas driver in order to enable some driver features. The target driver can query and modify these capabilities: synchronous, tagged-qing, wide-xfer, auto-rqsense, qfull-retries, qfull-retry-interval. All other capabilities can only be queried.

By default, tagged-qing, auto-rqsense, and wide-xfer capabilities are disabled, while disconnect, synchronous, and untagged-qing are enabled. These capabilities can only have binary values (0 or 1). The default values for qfull-retries and qfull-retry-interval are both 10. The qfull-retries capability is a u_char (0 to 255) while qfull-retry-interval is a u_short (0 to 65535).

The target driver needs to enable tagged-qing and wide-xfer explicitly. The untagged-qing capability is always enabled and its value cannot be modified, because fas can queue commands even when tagged-qing is disabled.

Whenever there is a conflict between the value of scsi-options and a capability, the value set in scsi-options prevails. Only whom != 0 is supported in the scsi_ifsetcap(9F) call.

Refer to scsi_ifsetcap(9F) and scsi_ifgetcap(9F) for details.

Files

/kernel/drv/fas
ELF Kernel Module
/kernel/drv/fas.conf
Optional configuration file

See Also

prtconf(1M) , driver.conf(4) , scsi_abort(9F) , scsi_hba_attach(9F) , scsi_ifgetcap(9F) , scsi_ifsetcap(9F) , scsi_reset(9F) , scsi_sync_pkt(9F) , scsi_transport(9F) , scsi_device(9S) , scsi_extended_sense(9S) , scsi_inquiry(9S) , scsi_pkt(9S)

OpenBoot Command Reference

ANSI Small Computer System Interface-2 (SCSI-2)

FAS366 Technical Manuals, QLogic Corp.

Diagnostics

The messages described below are some that may appear on the system console, as well as being logged.

The first five messages may be displayed while the fas driver is trying to attach; these messages mean that the fas driver was unable to attach. All of these messages are preceded by "fas%d", where "%d" is the instance number of the fas controller.

Device in slave-only slot
The SBus device has been placed in a slave-only slot and will not be accessible; move to non-slave-only SBus slot.
Device is using a hilevel intr
The device was configured with an interrupt level that cannot be used with this fas driver. Check the SBus device.
Unable to map FAS366 registers
Driver was unable to map device registers; check for bad hardware. Driver did not attach to device; SCSI devices will be inaccessible.
Cannot map dma
Driver was unable to locate a dma controller. This is an auto-configuration error.
Cannot attach
The driver was unable to attach; usually follows another warning that indicates why attach failed.
Disabled TQ since disconnects are disabled
Tagged queuing was disabled because disconnects were disabled in scsi-options.
Bad clock frequency
Check for bad hardware.
Sync of pkt (%x) failed
Syncing a SCSI packet failed. Refer to scsi_sync_pkt(9F) .
All tags in use!
The driver could not allocate another tag number. The target devices do not properly support tagged queuing.
Cannot alloc tag queue
The driver could not allocate space for tag queue.
Gross error in FAS366 status
The driver experienced severe SCSI bus problems. Check cables and terminator.
Spurious interrupt
The driver received an interrupt while the hardware was not interrupting.
Lost state in phasemanage
The driver is confused about the state of the SCSI bus.
Unrecoverable DMA error during selection
The DMA controller experienced host SBus problems. Check for bad hardware.
Bad sequence step (0x%x) in selection
The FAS366 hardware reported a bad sequence step. Check for bad hardware.
Undetermined selection failure
The selection of a target failed unexpectedly. Check for bad hardware.
Target <n>: failed reselection (bad reselect bytes)
A reconnect failed, target sent incorrect number of message bytes. Check for bad hardware.
Target <n>: failed reselection (bad identify message)
A reconnect failed, target didn’t sent identify message or it got corrupted. Check for bad hardware.
Target <n>: failed reselection (not in msgin phase)
Incorrect SCSI bus phase after reconnection. Check for bad hardware.
Target <n>: failed reselection (unexpected bus free)
Incorrect SCSI bus phase after reconnection. Check for bad hardware.
Target <n>: failed reselection (timeout on receiving tag msg)
A reconnect failed; target failed to send tag bytes. Check for bad hardware.
Target <n>: failed reselection (botched tag)
A reconnect failed; target failed to send tag bytes. Check for bad hardware.
Target <n>: failed reselection (invalid tag)
A reconnect failed; target sent incorrect tag bytes. Check for bad hardware.
Target <n>: failed reselection (Parity error in reconnect msg’s)
A reconnect failed; parity error detected. Check for bad hardware.
Target <n>: failed reselection (no command)
A reconnect failed; target accepted abort or reset, but still tries to reconnect. Check for bad hardware.
Unexpected bus free
Target disconnected from the bus without notice. Check for bad hardware.
Target <n> didn’t disconnect after sending <message>
The target unexpectedly did not disconnect after sending <message>.
Illegal dma boundary?
An attempt was made to cross a boundary that the driver could not handle.
Unwanted data xfer direction for Target <n>
The target went into an unexpected phase.
Spurious <name> phase from target <n>
The target went into an unexpected phase.
SCSI bus DATA IN phase parity error
The driver detected parity errors on the SCSI bus.
SCSI bus MESSAGE IN phase parity error
The driver detected parity errors on the SCSI bus.
SCSI bus STATUS phase parity error
The driver detected parity errors on the SCSI bus.
Premature end of extended message
An extended SCSI bus message did not complete. Suspect a target f/w problem.
Premature end of input message
A multibyte input message was truncated. Suspect a target f/w problem.
Input message botch
The driver is confused about messages coming from the target.
Extended message <n> is too long
The extended message sent by the target is longer than expected.
<name> message <n> from Target <m> garbled
Target <m> sent message <name> of value <n> which the driver did not understand.
Target <n> rejects our message <name>
Target <n> rejected a message sent by the driver.
Rejecting message <name> from Target <n>
The driver rejected a message received from target <n>.
Cmd transmission error
The driver was unable to send out command bytes.
Target <n> refused message resend
The target did not accept a message resend.
Two-byte message <name> <value> rejected
The driver does not accept this two-byte message.
Unexpected selection attempt
An attempt was made to select this host adapter by another initiator.
Polled cmd failed (target busy)
A polled command failed because the target did not complete outstanding commands within a reasonable time.
Polled cmd failed
A polled command failed because of timeouts or bus errors.
Disconnected command timeout for Target <id>.<lun>
A timeout occurred while target/lun was disconnected. This is usually a target f/w problem. For tagged queuing targets, <n> commands were outstanding when the timeout was detected.
Disconnected tagged cmds (<n>) timeout for Target <id>.<lun>
A timeout occurred while target/lun was disconnected. This is usually a target f/w problem. For tagged queuing targets, <n> commands were outstanding when the timeout was detected.
Connected command timeout for Target <id>.<lun>
This is usually a SCSI bus problem. Check cables and termination.
Target <id>.<lun> reverting to async. mode
A data transfer hang was detected. The driver attempts to eliminate this problem by reducing the data transfer rate.
Target <id>.<lun> reducing sync. transfer rate
A data transfer hang was detected. The driver attempts to eliminate this problem by reducing the data transfer rate.
Reverting to slow SCSI cable mode
A data transfer hang was detected. The driver attempts to eliminate this problem by reducing the data transfer rate.
Reset SCSI bus failed
An attempt to reset the SCSI bus failed.
External SCSI bus reset
Another initiator reset the SCSI bus.

Warnings

The fas hardware (FAS366) supports both Wide and fast SCSI mode, but fast20 is not supported. The maximum SCSI bandwidth is 20 MB/sec. Initiator mode block sequence (IBS) is not supported.

Notes

The fas driver exports properties indicating per target the negotiated transfer speed (target<n>-sync-speed), whether wide bus is supported (target<n>-wide), scsi-options for that particular target (target<n>-scsi-options), and whether tagged queuing has been enabled (target<n>-TQ). The sync-speed property value is the data transfer rate in KB/sec. The target<n>-TQ and the target<n>-wide property have value 1 to indicate that the corresponding capability is enabled, or 0 to indicate that the capability is disabled for that target. Refer to prtconf(1M) (verbose option) for viewing the fas properties. 
            SUNW,fas, instance #1
                Driver software properties:
                    name <target3-TQ> length <4>
                        value <0x00000001>.
                    name <target3-wide> length <4>
                        value <0x00000000>.
                    name <target3-sync-speed> length <4>
                        value <0x00002710>.
                    name <target3-scsi-options> length <4>
                        value <0x000003f8>.
                    name <target0-TQ> length <4>
                        value <0x00000001>.
                    name <pm_norm_pwr> length <4>
                        value <0x00000001>.
                    name <pm_timestamp> length <4>
                        value <0x30040346>.
                    name <scsi-options> length <4>
                        value <0x000003f8>.
                    name <scsi-watchdog-tick> length <4>
                        value <0x0000000a>.
                    name <scsi-tag-age-limit> length <4>
                        value <0x00000002>.
                    name <scsi-reset-delay> length <4>
                        value <0x00000bb8>.
                Register Specifications:
                    Bus Type=0x3, Address=0x8800000, Size=10
                    Bus Type=0x3, Address=0x8810000, Size=40
                Interrupt Specifications:
                    Interrupt Priority=0x35 (ipl 5)

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