| ||glm - GLM SCSI Host Bus Adapter Driver
The glm Host Bus Adapter driver is a SCSA
compliant nexus driver that supports the LSI 53c810, LSI 53c875, LSI 53c876,
LSI 53C896 and LSI 53C1010 SCSI chips
It supports the standard functions provided by the SCSA interface. That is, it supports tagged and untagged queuing,
Narrow/Wide/Fast/Ultra SCSI/Ultra SCSI 2/Ultra SCSI 3, and auto request sense,
but it does not support linked commands.
Configure the glm driver by defining properties in glm.conf. These properties override the global SCSI settings. glm supports these properties
which can be modified by the user: scsi-options, target<n>-scsi-options, scsi-reset-delay, scsi-tag-age-limit, scsi-watchdog-tick, and scsi-initiator-id.
overrides the scsi-options property value for target<n>. <n>
can vary from decimal 0 to 15. glm supports these scsi-options: SCSI_OPTIONS_DR, SCSI_OPTIONS_SYNC, SCSI_OPTIONS_TAG, SCSI_OPTIONS_FAST, SCSI_OPTIONS_WIDE, SCSI_OPTIONS_FAST20, SCSI_OPTIONS_FAST40 and SCSI_OPTIONS_FAST80.
After periodic interval scsi-watchdog-tick, the glm driver searches through all current and disconnected commands
scsi-tag-age-limit is the number of times that the glm 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).
| ||Example 1. Using the glm Configuration File
Create a file called /kernel/drv/glm.conf and add
the following line:
This disables tagged queuing, Fast/Ultra SCSI and wide mode for all glm instances.
The following example disables an option for one specific glm (refer to driver.conf(4)
and pci(4) for more
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/c0t0d0s0
lrwxrwxrwx 1 root root 45 May 16 10:08 /dev/rdsk/c0t0d0s0 ->
In this case, like the example above, the parent is /pci@1f,4000 and the unit-address is the number bound to
the scsi@3 node.
To set scsi-options more specifically per target:
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.
"SEAGATE ST32550W", "seagate-scsi-options" ;
seagate-scsi-options = 0x58;
scsi-options specified per target ID have the highest precedence, followed by scsi-options per device type. Global scsi-options (for all glm instances) per bus have the lowest precedence.
The system needs to be rebooted before the specified scsi-options take effect.
The target driver needs to set capabilities in the glm
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.
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)
ELF Kernel Module
- Optional configuration file
for descriptions of the following attributes:
|ATTRIBUTE TYPE||ATTRIBUTE VALUE
|Architecture||Limited to PCI-based systems with LSI 53c810, LSI 53c875, LSI 53c876, LSI 53c896 and LSI 53c1010 SCSI I/O processors
prtconf(1M), driver.conf(4), pci(4), attributes(5), 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)
Writing Device Drivers
ANSI Small Computer System Interface-2 (SCSI-2),
LSI Logi Inc (formerly Symbios Logic Inc.):
- SYM53c810 PCI-SCSI I/O processor with Narrow operation
- SYM53c875 PCI-SCSI I/O Processor With Fast-20
- SYM53c876 PCI-SCSI I/O processor Dual channel Fast-20
- SYM53c896 PCI-SCSI I/O processor Dual channel Fast-40
- SYM53c1010 PCI-SCSI I/O processor Dual Channel Fast-80
The messages described below are some that may appear on the system
console, as well as being logged.
- Device is using a hilevel intr
- The device was configured with an interrupt level that cannot be used
with this glm driver. Check the PCI device.
- map setup failed
- Driver was unable
to map device registers; check for bad hardware. Driver did not attach to
device; SCSI devices will be inaccessible.
- glm_script_alloc failed
- The driver
was unable to load the SCRIPTS for the SCSI processor, check for bad hardware. Driver did
not attach to device; SCSI devices will be
- cannot map configuration space.
- The driver was unable to map in the configuration registers. Check for bad
hardware. SCSI devices will be inaccessible.
- attach failed
- The driver was unable
to attach; usually preceded by another warning that indicates why attach failed.
These can be considered hardware failures.
- SCSI bus DATA IN phase parity error
- The driver detected parity errors on the SCSI
- 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
- Unexpected bus free
- Target disconnected
from the bus without notice. Check for bad hardware.
- 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 cmd(s) (<n>) timeout for Target
- 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
- Connected command timeout for Target <id>.<lun>
- This is usually a SCSI
bus problem. Check cables and termination.
- Target <id> reducing sync. transfer rate
- A data transfer hang or DATA-IN phase
parity error was detected. The driver attempts to eliminate this problem by
reducing the data transfer rate.
- Target <id> reverting to async. mode
- A second data transfer hang was detected for this target. The driver
attempts to eliminate this problem by reducing the data transfer rate.
- Target <id> disabled wide SCSI mode
- A second data phase hang was detected for this target. The driver attempts
to eliminate this problem by disabling wide SCSI
- auto request sense failed
- An attempt
to start an auto request packet failed. Another auto request packet may already
be in transport.
- invalid reselection (<id>.<lun>)
- A reselection failed; target accepted abort or reset, but still tries to reconnect. Check for bad hardware.
- invalid intcode
- The SCRIPTS processor generated an invalid SCRIPTS interrupt. Check for bad hardware.
The glm driver supports the following LSI chips:
- LSI 53C810, which supports Narrow, Fast SCSI mode. The maximum
SCSI bandwidth is 10 MB/sec.
- LSI 53C875, which supports Wide, Fast, and Ultra SCSI mode.
The maximum SCSI bandwidth is 40 MB/sec.
- LSI 53C896, which supports Wide, Fast and Ultra SCSI 2 mode.
The maximum LVD SCSI bandwidth is 80 MB/sec.
- LSI 53c1010, which supports wide, Fast and Ultra SCSI 3 mode.
The maximum LVD SCSI bandwidth is 160 MB/sec.
The glm driver exports properties indicating
per target the negotiated transfer speed (target<n>-sync-speed), whether wide bus is supported (target<n>-wide), for that particular
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 glm properties.
scsi, instance #0
name <target6-TQ> length <4>
name <target6-wide> length <4>
name <target6-sync-speed> length <4>
name <target1-TQ> length <4>
name <target1-wide> length <4>
name <target1-sync-speed> length <4>
name <target0-TQ> length <4>
name <target0-wide> length <4>
name <target0-sync-speed> length <4>
name <scsi-options> length <4>
name <scsi-watchdog-tick> length <4>
name <scsi-tag-age-limit> length <4>
name <scsi-reset-delay> length <4>
name <latency-timer> length <4>
name <cache-line-size> length <4>