NAME

mvs —

Marvell Serial ATA Host Controller driver

SYNOPSIS

To compile this driver into the kernel, place the following lines in your kernel configuration file:

device pci
device scbus
device mvs

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

mvs_load="YES"

The following tunables are settable from the loader(8):

hint.mvs.X.msi

controls Message Signaled Interrupts (MSI) usage by the specified controller.

hint.mvs.X.ccc

controls Command Completion Coalescing (CCC) usage by the specified controller. Non-zero value enables CCC and defines maximum time (in us), request can wait for interrupt. CCC reduces number of context switches on systems with many parallel requests, but it can decrease disk performance on some workloads due to additional command latency.

hint.mvs.X.cccc

defines number of completed commands for CCC, which trigger interrupt without waiting for specified coalescing timeout.

hint.mvsch.X.pm_level

controls SATA interface Power Management for the specified channel, allowing some power to be saved at the cost of additional command latency. Possible values:

0: interface Power Management is disabled (default);
1: device is allowed to initiate PM state change, host is passive;
4: driver initiates PARTIAL PM state transition 1ms after port becomes idle;
5: driver initiates SLUMBER PM state transition 125ms after port becomes idle.

Note that interface Power Management is not compatible with device presence detection. A manual bus reset is needed on device hot-plug.

hint.mvsch.X.sata_rev

setting to nonzero value limits maximum SATA revision (speed). Values 1, 2 and 3 are respectively 1.5, 3 and 6Gbps.

DESCRIPTION

This driver provides the CAM(4) subsystem with native access to the SATA ports of several generations (Gen-I/II/IIe) of Marvell SATA controllers. Each SATA port found is represented to CAM as a separate bus with one target, or, if HBA supports Port Multipliers (Gen-II/IIe), 16 targets. Most of the bus-management details are handled by the SATA-specific transport of CAM. Connected ATA disks are handled by the ATA protocol disk peripheral driver ada(4). ATAPI devices are handled by the SCSI protocol peripheral drivers cd(4), da(4), sa(4), etc.

Driver features include support for Serial ATA and ATAPI devices, Port Multipliers (including FIS-based switching, when supported), hardware command queues (up to 31 command per port), Native Command Queuing, SATA interface Power Management, device hot-plug and Message Signaled Interrupts.

HARDWARE

The mvs driver supports the following controllers:

Gen-I (SATA 1.5Gbps):

88SX5040
88SX5041
88SX5080
88SX5081

Gen-II (SATA 3Gbps, NCQ, PMP):

88SX6040
88SX6041 (including Adaptec 1420SA)
88SX6080
88SX6081

Gen-IIe (SATA 3Gbps, NCQ, PMP with FBS):

88SX6042
88SX7042 (including Adaptec 1430SA)
88F5182 SoC
88F6281 SoC
MV78100 SoC

Note, that this hardware supports command queueing and FIS-based switching only for ATA DMA commands. ATAPI and non-DMA ATA commands executed one by one for each port.

HISTORY

The mvs driver first appeared in FreeBSD 8.1.

AUTHORS

Alexander Motin <mav@FreeBSD.org>