176 lines
5.2 KiB
Groff
176 lines
5.2 KiB
Groff
.\" Copyright (c) 2009 Alexander Motin <mav@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd April 27, 2010
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.Dt MVS 4
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.Os
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.Sh NAME
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.Nm mvs
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.Nd Marvell Serial ATA Host Controller driver
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device pci"
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.Cd "device scbus"
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.Cd "device mvs"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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mvs_load="YES"
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.Ed
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.Pp
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The following tunables are settable from the
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.Xr loader 8 :
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.Bl -ohang
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.It Va hint.mvs. Ns Ar X Ns Va .msi
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controls Message Signaled Interrupts (MSI) usage by the specified controller.
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.It Va hint.mvs. Ns Ar X Ns Va .ccc
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controls Command Completion Coalescing (CCC) usage by the specified controller.
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Non-zero value enables CCC and defines maximum time (in us), request can wait
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for interrupt.
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CCC reduces number of context switches on systems with many parallel requests,
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but it can decrease disk performance on some workloads due to additional
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command latency.
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.It Va hint.mvs. Ns Ar X Ns Va .cccc
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defines number of completed commands for CCC, which trigger interrupt without
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waiting for specified coalescing timeout.
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.It Va hint.mvs. Ns Ar X Ns Va .pm_level
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controls SATA interface Power Management for the specified channel,
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allowing some power to be saved at the cost of additional command
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latency.
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Possible values:
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.Bl -tag -compact
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.It 0
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interface Power Management is disabled (default);
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.It 1
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device is allowed to initiate PM state change, host is passive;
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.It 4
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driver initiates PARTIAL PM state transition 1ms after port becomes idle;
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.It 5
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driver initiates SLUMBER PM state transition 125ms after port becomes idle.
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.El
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.Pp
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Note that interface Power Management is not compatible with
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device presence detection.
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A manual bus reset is needed on device hot-plug.
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.It Va hint.mvs. Ns Ar X Ns Va .sata_rev
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setting to nonzero value limits maximum SATA revision (speed).
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Values 1, 2 and 3 are respectively 1.5, 3 and 6Gbps.
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.El
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.Sh DESCRIPTION
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This driver provides the
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.Xr CAM 4
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subsystem with native access to the
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.Tn SATA
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ports of several generations (Gen-I/II/IIe) of Marvell SATA controllers.
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Each SATA port found is represented to CAM as a separate bus with one
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target, or, if HBA supports Port Multipliers (Gen-II/IIe), 16 targets.
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Most of the bus-management details are handled by the SATA-specific
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transport of CAM.
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Connected ATA disks are handled by the ATA protocol disk peripheral driver
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.Xr ada 4 .
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ATAPI devices are handled by the SCSI protocol peripheral drivers
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.Xr cd 4 ,
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.Xr da 4 ,
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.Xr sa 4 ,
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etc.
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.Pp
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Driver features include support for Serial ATA and ATAPI devices,
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Port Multipliers (including FIS-based switching, when supported),
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hardware command queues (up to 31 command per port),
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Native Command Queuing, SATA interface Power Management, device hot-plug
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and Message Signaled Interrupts.
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.Pp
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Same hardware is also supported by atamarvell and ataadaptec drivers from
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.Xr ata 4
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subsystem.
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If both drivers are loaded at the same time, this one will be
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given precedence as the more functional of the two.
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.Sh HARDWARE
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The
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.Nm
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driver supports the following controllers:
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.Bl -tag -compact
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.It Gen-I (SATA 1.5Gbps):
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.Bl -bullet -compact
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.It
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88SX5040
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.It
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88SX5041
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.It
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88SX5080
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.It
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88SX5081
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.El
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.It Gen-II (SATA 3Gbps, NCQ, PMP):
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.Bl -bullet -compact
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.It
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88SX6040
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.It
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88SX6041 (including Adaptec 1420SA)
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.It
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88SX6080
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.It
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88SX6081
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.El
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.It Gen-IIe (SATA 3Gbps, NCQ, PMP with FBS):
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.Bl -bullet -compact
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.It
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88SX6042
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.It
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88SX7042 (including Adaptec 1430SA)
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.It
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88F5182 SoC
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.It
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88F6281 SoC
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.It
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MV78100 SoC
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.El
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.El
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Note, that this hardware supports command queueing and FIS-based switching
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only for ATA DMA commands. ATAPI and non-DMA ATA commands executed one by one
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for each port.
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.Pp
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.Sh SEE ALSO
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.Xr ada 4 ,
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.Xr ata 4 ,
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.Xr cam 4 ,
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.Xr cd 4 ,
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.Xr da 4 ,
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.Xr sa 4
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Fx 8.1 .
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.Sh AUTHORS
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.An Alexander Motin Aq mav@FreeBSD.org .
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