man pages section 7: Device and Network Interfaces

fas(7D)

Name

fas– FAS SCSI Host Bus Adapter Driver

Synopsis

fas@sbus-slot,0x8800000

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, 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 decimal 0 to 15. The supported scsi-options are: SCSI_OPTIONS_DR, SCSI_OPTIONS_SYNC, SCSI_OPTIONS_TAG, SCSI_OPTIONS_FAST, and SCSI_OPTIONS_WIDE.

After periodic interval scsi-watchdog-tick, the fas driver searches all current and disconnected commands 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

Example 1 A sample of fas configuration file

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

scsi-options=0x78;

This disables tagged queuing, Fast SCSI, and Wide mode for all fas instances. The following example disables an option for one specific fas (refer to driver.conf(4) for more details):

 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 example above sets 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

Determine the register property values using the output from prtconf(1M) (with the -v option):

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

scsi-options can also be specified per device type using the device inquiry string. All the devices with the same inquiry string will have the same scsi-options set. This can be used to disable some scsi-options on all the devices of the same type.

device-type-scsi-options-list=
    "TOSHIBA    XM5701TASUN12XCD", "cd-scsi-options";
cd-scsi-options = 0x0;

The above entry in /kernel/drv/fas.conf sets the scsi-options for all devices with inquiry string TOSHIBA XM5701TASUN12XCD to cd-scsi-options. To get the inquiry string, run the probe-scsi or probe-scsi-all command at the ok prompt before booting the system.

To set scsi-options more specifically per target:

target1-scsi-options=0x78;
device-type-scsi-options-list =
    "SEAGATE ST32550W", "seagate-scsi-options" ;
seagate-scsi-options = 0x58;
scsi-options=0x3f8;

The above sets scsi-options for target 1 to 0x78 and for all other targets on this SCSI bus to 0x3f8 except for one specific disk type which will have scsi-options set to 0x58.

scsi-options specified per target ID have the highest precedence, followed by scsi-options per device type. Global fas scsi-options (effecting all instances) per bus have the lowest precedence.

The system needs to be rebooted before the specified scsi-options take effect.

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 value for qfull-retries is 10 and the default value for qfull-retry-interval is 100. The qfull-retries capability is a uchar_t (0 to 255) while qfull-retry-interval is a ushort_t (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

Attributes

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Architecture	Limited to Sparc SBus-based systems with FAS366-based SCSI port and SunSWIFT SBus SCSI Host Adapter/Fast Ethernet option.

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.
Cannot alloc dma handle: Driver was unable to allocate memory for a DMA controller.
Cannot alloc cmd area: Driver was unable to allocate memory for a command address.
Cannot create kmem_cache: Driver was unable to allocate memory for internal data structures.
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 add intr: Driver could not add its interrupt service routine to the kernel.
Cannot map dma: Driver was unable to locate a DMA controller. This is an auto-configuration error.
Cannot bind cmdarea: Driver was unable to bind the DMA handle to an address.
Cannot create devctl minor node: Driver is unable to create a minor node for the controller.
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 (<address>) 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.
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 (<step number>) 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 send 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>.
Bad sequence step (0x?) in selection: The sequence step register shows an improper value. The target might be misbehaving.
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.
Unrecoverable DMA error on dma <send/receive>: There is a DMA error while sending/receiving data. The host DMA controller is experiencing some problems.
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 firmware problem.
Premature end of input message: A multibyte input message was truncated. Suspect a target firmware 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.
MESSAGE OUT phase parity error: The driver detected parity errors on the SCSI bus.
Two byte message <name> <value> rejected: The driver does not accept this two byte message.
Gross error in fas status <stat>: The fas chip has indicated a gross error like FIFO overflow.
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.
Auto request sense failed: Driver is unable to get request sense from the target.
Disconnected command timeout for Target <id>.<lun>: A timeout occurred while target id/lun was disconnected. This is usually a target firmware 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 id/lun was disconnected. This is usually a target firmware 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.
Target <id> reducing sync. transfer rate: A data transfer hang was detected. The driver attempts to eliminate this problem by reducing the data transfer rate.
Target <id> 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> disabled wide SCSI mode: Due to problems on the SCSI bus, the driver goes into more conservative mode of operation to avoid further problems.
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)

SunOS 5.10 Last Revised 20 Jun 1997