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ahci.4freebsd

Langue: en

Version: 361755 (ubuntu - 24/10/10)

Section: 4 (Pilotes et protocoles réseau)


BSD mandoc

NAME

ahci - Serial ATA Advanced Host Controller Interface driver

SYNOPSIS

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

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf5:

 ahci_load="YES"
 

The following tunables are settable from the loader:

hint.ahci.X.msi
controls Message Signaled Interrupts (MSI) usage by the specified controller
0
MSI disabled;
1
single MSI vector used, if supported (default);
2
multiple MSI vectors used, if supported;
hint.ahci.X.ccc
controls Command Completion Coalescing (CCC) usage by the specified controller. Non-zero value enables CCC and defines maximum time (in ms), request can wait for interrupt, if there are some more requests present on controller queue. 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.ahcich.X.pm_level
controls SATA interface Power Management for 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;
2
host initiates PARTIAL PM state transition every time port becomes idle;
3
host initiates SLUMBER PM state transition every time port becomes idle.
4
driver initiates PARTIAL PM state transition 1ms after port becomes idle;
5
driver initiates SLUMBER PM state transition 125ms after port becomes idle.

Some controllers, such as ICH8, do not implement modes 2 and 3 with NCQ used. Because of artificial entering latency, performance degradation in modes 4 and 5 is much smaller then in modes 2 and 3.

Note that interface Power Management is not compatible with device presence detection. You will have to reset bus manually on device hot-plug.

hint.ahcich.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 subsystem with native access to the SATA ports of AHCI-compatible controllers. Each SATA port found is represented to CAM as a separate bus with one target, or, if HBA supports Port Multipliers, 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, hardware command queues (up to 32 commands per port), Native Command Queuing, SATA interface Power Management, device hot-plug and Message Signaled Interrupts.

The Port Multiplier FIS Based Switching feature added in the AHCI 1.2 specification, which is required for effective parallel operation of devices behind Port Multipliers, is not yet supported.

AHCI hardware is also supported by ataahci driver 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.

HARDWARE

The driver supports AHCI compatible controllers having PCI class 1 (mass storage), subclass 6 (SATA) and programming interface 1 (AHCI).

SEE ALSO

ada(4), cd(4), da(4), sa(4), scsi(4), ata(4)

HISTORY

The driver first appeared in Fx 8.0 .

AUTHORS

An Alexander Motin Aq mav@FreeBSD.org .
> Je cherche une methode pour verifier si le port 515 est a l'ecoute.
> Cette requete est a envoyer d'une station Solaris vers un serveur NT.
use Net::TCP; $object = new Net::TCP "playstation", 515;
$ok = $object->connect; -- SB in Guide du linuxien pervers