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.\" Common Development and Distribution License ("CDDL"), version 1.0.
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.\" 1.0 of the CDDL.
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.\" Copyright 2016 Joyent, Inc.
.\"
.Dd January 10, 2020
.Dt XHCI 4D
.Os
.Sh NAME
.Nm xhci
.Nd Extensible Host Controller Interface Driver
.Sh SYNOPSIS
.Sy usb@unit-address
.Sh DESCRIPTION
The
.Nm
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).
.Pp
The
.Nm
driver supports all four USB transfer types:
.Sy bulk transfers ,
.Sy control transfers ,
.Sy interrupt transfers ,
and
.Sy isochronous transfers .
.Pp
Administrators do not interact with the
.Nm
driver directly.
USB devices are managed with
.Xr cfgadm 8 .
See
.Xr cfgadm_usb 8
for more information on how to specifically manage USB devices and how
they are laid out in the system.
.Xr cfgadm 8
is only used to manage devices at a USB level.
For example, a USB NIC would still be managed with
.Xr dladm 8
at a networking level.
.Pp
On some x86 systems USB ports may be routed to either an instance of the
.Nm
driver or an instance of the
.Xr ehci 4D
driver.
By default, all such ports are routed to the
.Nm
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
.Sy 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.
.Sh PROPERTIES
The
.Nm
driver supports the following properties which may be tuned in the
.Nm
driver's
.Xr driver.conf 5
file.
.Bl -tag -width Sy
.It Sy xhci-reroute
The
.Sy xhci-reroute
property determines whether or not USB ports are re-routed to the
.Nm
driver.
The default behavior is to route such ports.
To disable this, the property should be set to
.Sy 0 .
Any other value, or the lack of the property, cause the default behavior
to take place.
.El
.Sh ARCHITECTURE
The
.Nm
driver is only supported on
.Sy x86
systems at this time.
.Sh FILES
.Bl -tag -width Pa
.It Pa /kernel/drv/amd64/xhci
Device driver (x86)
.It Pa /kernel/drv/xhci.conf
Driver configuration file
.El
.Sh SEE ALSO
.Xr ehci 4D ,
.Xr usba 4D ,
.Xr driver.conf 5 ,
.Xr cfgadm 8 ,
.Xr cfgadm_usb 8 ,
.Xr dladm 8