man/man4/mps.4

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.\" Copyright (c) 2010 Spectra Logic Corporation
.\" Copyright (c) 2014 LSI Corp
.\" Copyright (c) 2016 Avago Technologies
.\" Copyright (c) 2016 Broadcom Ltd.
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.\" mps driver man page.
.\"
.\" Author: Ken Merry <ken@FreeBSD.org>
.\" Author: Stephen McConnell <slm@FreeBSD.org>
.\"
.\" $Id: //depot/SpectraBSD/head/share/man/man4/mps.4#6 $
.\" $FreeBSD$
.\"
.Dd July 5, 2016
.Dt MPS 4
.Os
.Sh NAME
.Nm mps
.Nd "LSI Fusion-MPT 2 IT/IR 6Gb/s Serial Attached SCSI/SATA driver"
.Sh SYNOPSIS
To compile this driver into the kernel, place these lines in the kernel
configuration file:
.Bd -ragged -offset indent
.Cd "device pci"
.Cd "device scbus"
.Cd "device mps"
.Ed
.Pp
The driver can be loaded as a module at boot time by placing this line in
.Xr loader.conf 5 :
.Bd -literal -offset indent
mps_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
driver provides support for Broadcom Ltd./Avago Tech (LSI)
Fusion-MPT 2 IT/IR
.Tn SAS
controllers and WarpDrive solid state storage cards.
.Sh HARDWARE
These controllers are supported by the
.Nm
driver:
.Pp
.Bl -bullet -compact
.It
Broadcom Ltd./Avago Tech (LSI) SAS 2004 (4 Port SAS)
.It
Broadcom Ltd./Avago Tech (LSI) SAS 2008 (8 Port SAS)
.It
Broadcom Ltd./Avago Tech (LSI) SAS 2108 (8 Port SAS)
.It
Broadcom Ltd./Avago Tech (LSI) SAS 2116 (16 Port SAS)
.It
Broadcom Ltd./Avago Tech (LSI) SAS 2208 (8 Port SAS)
.It
Broadcom Ltd./Avago Tech (LSI) SAS 2308 (8 Port SAS)
.It
Broadcom Ltd./Avago Tech (LSI) SSS6200 Solid State Storage
.It
Intel Integrated RAID Module RMS25JB040
.It
Intel Integrated RAID Module RMS25JB080
.It
Intel Integrated RAID Module RMS25KB040
.It
Intel Integrated RAID Module RMS25KB080
.El
.Sh CONFIGURATION
.Pp
In all tunable descriptions below, X represents the adapter number.
.Pp
To disable MSI interrupts for all
.Nm
driver instances, set this tunable value in
.Xr loader.conf 5 :
.Bd -literal -offset indent
hw.mps.disable_msi=1
.Ed
.Pp
To disable MSI interrupts for a specific
.Nm
driver instance, set this tunable value in
.Xr loader.conf 5 :
.Bd -literal -offset indent
dev.mps.X.disable_msi=1
.Ed
.Pp
To disable MSI-X interrupts for all
.Nm
driver instances, set this tunable value in
.Xr loader.conf 5 :
.Bd -literal -offset indent
hw.mps.disable_msix=1
.Ed
.Pp
To disable MSI-X interrupts for a specific
.Nm
driver instance, set this tunable value in
.Xr loader.conf 5 :
.Bd -literal -offset indent
dev.mps.X.disable_msix=1
.Ed
.Pp
To set the maximum number of DMA chains allocated for all adapters, set this
tunable in
.Xr loader.conf 5 :
.Bd -literal -offset indent
hw.mps.max_chains=NNNN
.Ed
.Pp
To set the maximum number of DMA chains allocated for a specific adapter,
set this tunable in
.Xr loader.conf 5 :
.Bd -literal -offset indent
dev.mps.X.max_chains=NNNN
.Ed
.Pp
The default max_chains value is 2048.
.Pp
The current number of free chain frames is stored in the
dev.mps.X.chain_free
.Xr sysctl 8
variable.
.Pp
The lowest number of free chain frames seen since boot is stored in the
dev.mps.X.chain_free_lowwater
.Xr sysctl 8
variable.
.Pp
The number of times that chain frame allocations have failed since boot is
stored in the
dev.mps.X.chain_alloc_fail
.Xr sysctl 8
variable.
This can be used to determine whether the max_chains tunable should be
increased to help performance.
.Pp
The current number of active I/O commands is shown in the
dev.mps.X.io_cmds_active
.Xr sysctl 8
variable.
.Ed
.Pp
To set the maximum number of pages that will be used per I/O for all adapters,
set this tunable in
.Xr loader.conf 5 :
.Bd -literal -offset indent
hw.mps.max_io_pages=NNNN
.Ed
.Pp
To set the maximum number of pages that will be used per I/O for a specific
adapter, set this tunable in
.Xr loader.conf 5 :
.Bd -literal -offset indent
dev.mps.X.max_io_pages=NNNN
.Ed
.Pp
The default max_io_pages value is -1, meaning that the maximum I/O size that
will be used per I/O will be calculated using the IOCFacts values stored in
the controller.
The lowest value that the driver will use for max_io_pages is 1, otherwise
IOCFacts will be used to calculate the maximum I/O size.
The smaller I/O size calculated from either max_io_pages or IOCFacts will be the
maximum I/O size used by the driver.
.Pp
The highest number of active I/O commands seen since boot is stored in the
dev.mps.X.io_cmds_highwater
.Xr sysctl 8
variable.
.Pp
Devices can be excluded from
.Nm
control for all adapters by setting this tunable in
.Xr loader.conf 5 :
.Bd -literal -offset indent
hw.mps.exclude_ids=Y
.Ed
.Pp
Y represents the target ID of the device.
If more than one device is to be excluded, target IDs are separated by commas.
.Pp
Devices can be excluded from
.Nm
control for a specific adapter by setting this tunable in
.Xr loader.conf 5 :
.Bd -literal -offset indent
dev.mps.X.exclude_ids=Y
.Ed
.Pp
Y represents the target ID of the device.
If more than one device is to be excluded, target IDs are separated by commas.
.Pp
The adapter can issue the
.Sy StartStopUnit
SCSI command to SATA direct-access devices during shutdown.
This allows the device to quiesce powering down.
To control this feature for all adapters, set the
.Bd -literal -offset indent
hw.mps.enable_ssu
.Ed
.Pp
tunable in
.Xr loader.conf 5
to one of these values:
.Bl -tag -width 6n -offset indent
.It 0
Do not send SSU to either HDDs or SSDs.
.It 1
Send SSU to SSDs, but not to HDDs.
This is the default value.
.It 2
Send SSU to HDDs, but not to SSDs.
.It 3
Send SSU to both HDDs and SSDs.
.El
.Pp
To control the feature for a specific adapter, set this tunable value in
.Xr loader.conf 5 :
.Bd -literal -offset indent
dev.mps.X.enable_ssu
.Ed
.Pp
The same set of values are valid when setting this tunable for all adapters.
.Pp
SATA disks that take several seconds to spin up and fail the SATA Identify
command might not be discovered by the driver.
This problem can sometimes be overcome by increasing the value of the spinup
wait time in
.Xr loader.conf 5
with the
.Bd -literal -offset indent
hw.mps.spinup_wait_time=NNNN
.Ed
.Pp
tunable.
NNNN represents the number of seconds to wait for SATA devices to spin up when
the device fails the initial SATA Identify command.
.Pp
Spinup wait times can be set for specific adapters in
.Xr loader.conf 5 :
with the
.Bd -literal -offset indent
dev.mps.X.spinup_wait_time=NNNN
.Ed
.Pp
tunable.
NNNN is the number of seconds to wait for SATA devices to spin up when they fail
the initial SATA Identify command.
.Sh DEBUGGING
To enable debugging prints from the
.Nm
driver, set the
.Bd -literal -offset indent
hw.mps.X.debug_level
.Ed
.Pp
tunable, either in
.Xr loader.conf 5
or by using
.Xr sysctl 8 .
These bits have the described effects:
.Bd -literal -offset indent
0x0001 Enable informational prints (set by default).
0x0002 Enable prints for driver faults (set by default).
0x0004 Enable prints for controller events.
0x0008 Enable prints for controller logging.
0x0010 Enable prints for tracing recovery operations.
0x0020 Enable prints for parameter errors and programming bugs.
0x0040 Enable prints for system initialization operations.
0x0080 Enable prints for more detailed information.
0x0100 Enable prints for user-generated commands (IOCTL).
0x0200 Enable prints for device mapping.
0x0400 Enable prints for tracing through driver functions.
.Ed
.Sh SEE ALSO
.Xr cam 4 ,
.Xr cd 4 ,
.Xr ch 4 ,
.Xr da 4 ,
.Xr mpr 4 ,
.Xr mpt 4 ,
.Xr pci 4 ,
.Xr sa 4 ,
.Xr scsi 4 ,
.Xr targ 4 ,
.Xr loader.conf 5 ,
.Xr sysctl 8
.Sh HISTORY
The
.Nm
driver first appeared in FreeBSD 9.3.
.Sh AUTHORS
The
.Nm
driver was originally written by
.An -nosplit
.An Scott Long Aq Mt scottl@FreeBSD.org .
It has been improved and tested by LSI Corporation,
Avago Technologies (formally LSI), and Broadcom Ltd. (formally Avago).
.Pp
This man page was written by
.An Ken Merry Aq Mt ken@FreeBSD.org
with additional input from
.An Stephen McConnell Aq Mt slm@FreeBSD.org .