illumos: manual page: xhci.4d

XHCI(4D) 4D XHCI(4D)

NAME

xhci - Extensible Host Controller Interface Driver

SYNOPSIS

usb@unit-address

DESCRIPTION

The xhci driver supports PCI devices that implement versions 1.0 and 1.1 of
the Extensible Host Controller Interface Specification. These devices
provide support for USB 3.0, USB 2.x, and USB 1.x devices and is integrated
into the broader illumos USB Architecture (USBA).

The xhci driver supports all four USB transfer types: bulk transfers,
control transfers, interrupt transfers, and isochronous transfers.

Administrators do not interact with the xhci driver directly. USB devices
are managed with cfgadm(8). See cfgadm_usb(8) for more information on how
to specifically manage USB devices and how they are laid out in the system.
cfgadm(8) is only used to manage devices at a USB level. For example, a
USB NIC would still be managed with dladm(8) at a networking level.

On some x86 systems USB ports may be routed to either an instance of the
xhci driver or an instance of the ehci(4D) driver. By default, all such
ports are routed to the xhci driver, allowing those devices to operate at
USB 3.x speed by default. This is most common on Intel platforms and
chipsets. While this is controlled with the xhci-reroute property
discussed below, changing it may not be sufficient to change the behavior.
The BIOS or ACPI data for many x86 systems may toggle this automatically.

PROPERTIES

The xhci driver supports the following properties which may be tuned in the
xhci driver's driver.conf(5) file.

xhci-reroute
The xhci-reroute property determines whether or not USB ports are
re-routed to the xhci driver. The default behavior is to route
such ports. To disable this, the property should be set to 0. Any
other value, or the lack of the property, cause the default
behavior to take place.

ARCHITECTURE

The xhci driver is only supported on x86 systems at this time.

FILES