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NAME
smartpqi - Microchip Smart Storage SCSI driver
SYNOPSIS
modprobe smartpqi [disable_device_id_wildcards={0|1}] [disable_heartbeat={0|1}]
[disable_ctrl_shutdown={0|1}] [lockup_action={none|reboot|panic}]
[expose_ld_first={0|1}] [hide_vsep={0|1}]
[disable_managed_interrupts={0|1}] [ctrl_ready_timeout={0|[30,1800]}]
DESCRIPTION
smartpqi is a SCSI driver for Microchip Smart Storage controllers.
Supported ioctl() operations
For compatibility with applications written for the cciss(4) and hpsa(4) drivers, many,
but not all of the ioctl(2) operations supported by the hpsa driver are also supported by
the smartpqi driver. The data structures used by these operations are described in the
Linux kernel source file include/linux/cciss_ioctl.h.
CCISS_DEREGDISK
CCISS_REGNEWDISK
CCISS_REGNEWD
These operations all do exactly the same thing, which is to cause the driver to re-
scan for new devices. This does exactly the same thing as writing to the smartpqi-
specific host rescan attribute.
CCISS_GETPCIINFO
This operation returns the PCI domain, bus, device, and function and "board ID"
(PCI subsystem ID).
CCISS_GETDRIVVER
This operation returns the driver version in four bytes, encoded as:
(major_version << 28) | (minor_version << 24) |
(release << 16) | revision
CCISS_PASSTHRU
Allows BMIC and CISS commands to be passed through to the controller.
Boot options
disable_device_id_wildcards={0|1}
Disables support for device ID wildcards. The default value is 0 (wildcards are
enabled).
disable_heartbeat={0|1}
Disables support for the controller's heartbeat check. This parameter is used for
debugging purposes. The default value is 0 (the controller's heartbeat check is
enabled).
disable_ctrl_shutdown={0|1}
Disables support for shutting down the controller in the event of a controller
lockup. The default value is 0 (controller will be shut down).
lockup_action={none|reboot|panic}
Specifies the action the driver takes when a controller lockup is detected. The
default action is none.
parameter action
─────────────────────────────────────────────
none take controller offline only
reboot reboot the system
panic panic the system
expose_ld_first={0|1}
This option exposes logical devices to the OS before physical devices. The default
value is 0 (physical devices exposed first).
hide_vsep={0|1}
This option disables exposure of the virtual SEP to the OS. The default value is 0
(virtual SEP is exposed).
disable_managed_interrupts={0|1}
Disables driver utilization of Linux kernel managed interrupts for controllers.
The managed interrupts feature automatically distributes interrupts to all
available CPUs and assigns SMP affinity. The default value is 0 (managed
interrupts enabled).
ctrl_ready_timeout={0|[30,1800]}
This option specifies the timeout in seconds for the driver to wait for the
controller to be ready. The valid range is 0 or [30, 1800]. The default value is
0, which causes the driver to use a timeout of 180 seconds.
FILES
Device nodes
Disk drives are accessed via the SCSI disk driver (sd), tape drives via the SCSI tape
driver (st), and the RAID controller via the SCSI generic driver (sg), with device nodes
named /dev/sd*, /dev/st*, and /dev/sg*, respectively.
SmartPQI-specific host attribute files in /sys
/sys/class/scsi_host/host*/rescan
The host rescan attribute is a write-only attribute. Writing to this attribute
will cause the driver to scan for new, changed, or removed devices (e.g., hot-
plugged tape drives, or newly configured or deleted logical volumes) and notify the
SCSI mid-layer of any changes detected. Usually this action is triggered
automatically by configuration changes, so the user should not normally have to
write to this file. Doing so may be useful when hot-plugging devices such as tape
drives or entire storage boxes containing pre-configured logical volumes.
/sys/class/scsi_host/host*/lockup_action
The host lockup_action attribute is a read/write attribute. This attribute will
cause the driver to perform a specific action in the unlikely event that a
controller lockup has been detected. See OPTIONS above for an explanation of the
lockup_action values.
/sys/class/scsi_host/host*/driver_version
The driver_version attribute is read-only. This attribute contains the smartpqi
driver version.
For example:
$ cat /sys/class/scsi_host/host1/driver_version
1.1.2-126
/sys/class/scsi_host/host*/firmware_version
The firmware_version attribute is read-only. This attribute contains the
controller firmware version.
For example:
$ cat /sys/class/scsi_host/host1/firmware_version
1.29-112
/sys/class/scsi_host/host*/model
The model attribute is read-only. This attribute contains the product
identification string of the controller.
For example:
$ cat /sys/class/scsi_host/host1/model
1100-16i
/sys/class/scsi_host/host*/serial_number
The serial_number attribute is read-only. This attribute contains the unique
identification number of the controller.
For example:
$ cat /sys/class/scsi_host/host1/serial_number
6A316373777
/sys/class/scsi_host/host*/vendor
The vendor attribute is read-only. This attribute contains the vendor
identification string of the controller.
For example:
$ cat /sys/class/scsi_host/host1/vendor
Adaptec
/sys/class/scsi_host/host*/enable_stream_detection
The enable_stream_detection attribute is read-write. This attribute
enables/disables stream detection in the driver. Enabling stream detection can
improve sequential write performance for ioaccel-enabled volumes. See the
ssd_smart_path_enabled disk attribute section for details on ioaccel-enabled
volumes. The default value is 1 (stream detection enabled).
Enable example:
$ echo 1 > /sys/class/scsi_host/host1/enable_stream_detection
/sys/class/scsi_host/host*/enable_r5_writes
The enable_r5_writes attribute is read-write. This attribute enables/disables RAID
5 write operations for ioaccel-enabled volumes. Enabling can improve sequential
write performance. See the ssd_smart_path_enabled disk attribute section for
details on ioaccel-enabled volumes. The default value is 1 (RAID 5 writes
enabled).
Enable example:
$ echo 1 > /sys/class/scsi_host/host1/enable_r5_writes
/sys/class/scsi_host/host*/enable_r6_writes
The enable_r6_writes attribute is read-write. This attribute enables/disables RAID
6 write operations for ioaccel-enabled volumes. Enabling can improve sequential
write performance. See the ssd_smart_path_enabled disk attribute section for
details on ioaccel-enabled volumes. The default value is 1 (RAID 6 writes
enabled).
Enable example:
$ echo 1 > /sys/class/scsi_host/host1/enable_r6_writes
SmartPQI-specific disk attribute files in /sys
In the file specifications below, c stands for the number of the appropriate SCSI
controller, b is the bus number, t the target number, and l is the logical unit number
(LUN).
/sys/class/scsi_disk/c:b:t:l/device/raid_level
The raid_level attribute is read-only. This attribute contains the RAID level of
the logical volume.
For example:
$ cat /sys/class/scsi_disk/4:0:0:0/device/raid_level
RAID 0
/sys/class/scsi_disk/c:b:t:l/device/sas_address
The sas_address attribute is read-only. This attribute contains the SAS address of
the device.
For example:
$ cat /sys/class/scsi_disk/1:0:3:0/device/sas_address
0x5001173d028543a2
/sys/class/scsi_disk/c:b:t:l/device/ssd_smart_path_enabled
The ssd_smart_path_enabled attribute is read-only. This attribute is for ioaccel-
enabled volumes. (Ioaccel is an alternative driver submission path that allows the
driver to send I/O requests directly to backend SCSI devices, bypassing the
controller firmware. This results in an increase in performance. This method is
used for HBA disks and for logical volumes comprised of SSDs.) Contains 1 if
ioaccel is enabled for the volume and 0 otherwise.
For example:
$ cat /sys/class/scsi_disk/1:0:3:0/device/ssd_smart_path_enabled
0
/sys/class/scsi_disk/c:b:t:l/device/lunid
The lunid attribute is read-only. This attribute contains the SCSI LUN ID for the
device.
For example:
$ cat /sys/class/scsi_disk/13:1:0:3/device/lunid
0x0300004000000000
/sys/class/scsi_disk/c:b:t:l/device/unique_id
The unique_id attribute is read-only. This attribute contains a 16-byte ID that
uniquely identifies the device within the controller.
For example:
$ cat /sys/class/scsi_disk/13:1:0:3/device/unique_id
600508B1001C6D4723A8E98D704FDB94
/sys/class/scsi_disk/c:b:t:l/device/path_info
The path_info attribute is read-only. This attribute contains the c:b:t:l of the
device along with the device type and whether the device is Active or Inactive. If
the device is an HBA device, path_info will also display the PORT, BOX, and BAY the
device is plugged into.
For example:
$ cat /sys/class/scsi_disk/13:1:0:3/device/path_info
[13:1:0:3] Direct-Access Active
$ cat /sys/class/scsi_disk/12:0:9:0/device/path_info
[12:0:9:0] Direct-Access PORT: C1 BOX: 1 BAY: 14 Inactive
[12:0:9:0] Direct-Access PORT: C0 BOX: 1 BAY: 14 Active
/sys/class/scsi_disk/c:b:t:l/device/raid_bypass_cnt
The raid_bypass_cnt attribute is read-only. This attribute contains the number of
I/O requests that have gone through the ioaccel path for ioaccel-enabled volumes.
See the ssd_smart_path_enabled disk attribute section for details on ioaccel-
enabled volumes.
For example:
$ cat /sys/class/scsi_disk/13:1:0:3/device/raid_bypass_cnt
0x300
/sys/class/scsi_disk/c:b:t:l/device/sas_ncq_prio_enable
The sas_ncq_prio_enable attribute is read/write. This attribute enables SATA NCQ
priority support. This attribute works only when device has NCQ support and
controller firmware can handle IO with NCQ priority attribute.
For example:
$ echo 1 > /sys/class/scsi_disk/13:1:0:3/device/sas_ncq_prio_enable
VERSIONS
The smartpqi driver was added in Linux 4.9.
NOTES
Configuration
To configure a Microchip Smart Storage controller, refer to the User Guide for the
controller, which can be found by searching for the specific controller at
⟨https://www.microchip.com/design-centers/storage⟩.
HISTORY
/sys/class/scsi_host/host*/version was replaced by two sysfs entries:
/sys/class/scsi_host/host*/driver_version
/sys/class/scsi_host/host*/firmware_version
SEE ALSO
cciss(4), hpsa(4), sd(4), st(4), sg(4)
Documentation/ABI/testing/sysfs-bus-pci-devices-cciss in the Linux kernel source tree.