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mvs — Marvell Serial ATA Host Controller driver
To compile this driver into the kernel, place the following lines in your
kernel configuration file:
Alternatively, to load the driver as a module at boot time, place the
following line in loader.conf(5):
The following tunables are settable from the loader(8):
controls Message Signaled Interrupts (MSI) usage by the specified
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.
defines number of completed commands for CCC, which trigger interrupt
without waiting for specified coalescing timeout.
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
4 driver initiates PARTIAL PM state transition 1ms after port
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.
setting to nonzero value limits maximum SATA revision (speed). Values 1,
2 and 3 are respectively 1.5, 3 and 6Gbps.
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
Same hardware is also supported by atamarvell and ataadaptec drivers from
ata(4) subsystem. If both drivers are loaded at the same time, this one
will be given precedence as the more functional of the two.
The mvs driver supports the following controllers:
Gen-I (SATA 1.5Gbps):
Gen-II (SATA 3Gbps, NCQ, PMP):
· 88SX6041 (including Adaptec 1420SA)
Gen-IIe (SATA 3Gbps, NCQ, PMP with FBS):
· 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.
ada(4), ata(4), cam(4), cd(4), da(4), sa(4)
The mvs driver first appeared in FreeBSD 8.1.
Alexander Motin ⟨mav@FreeBSD.org⟩.