Ubuntu Manpage: mvs — Marvell Serial ATA Host Controller driver

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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