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MVS(4)		       FreeBSD Kernel Interfaces Manual			MVS(4)

     mvs -- Marvell Serial ATA Host Controller driver

     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):


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

     controls Message Signaled Interrupts (MSI)	usage by the specified con-

     controls Command Completion Coalescing (CCC) usage	by the specified con-
     troller.  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 perfor-
     mance 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, al-
     lowing 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	pas-
	   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	pres-
     ence 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 Inter-

     The mvs driver supports the following controllers:

     Gen-I (SATA 1.5Gbps):
	   o   88SX5040
	   o   88SX5041
	   o   88SX5080
	   o   88SX5081

     Gen-II (SATA 3Gbps, NCQ, PMP):
	   o   88SX6040
	   o   88SX6041	(including Adaptec 1420SA)
	   o   88SX6080
	   o   88SX6081

     Gen-IIe (SATA 3Gbps, NCQ, PMP with	FBS):
	   o   88SX6042
	   o   88SX7042	(including Adaptec 1430SA)
	   o   88F5182 SoC
	   o   88F6281 SoC
	   o   MV78100 SoC

     Note, that	this hardware supports command queueing	and FIS-based switch-
     ing 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 <>

FreeBSD	13.0			March 23, 2015			  FreeBSD 13.0


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