| XHCI(4D) | Devices | XHCI(4D) |
xhci — Extensible
Host Controller Interface Driver
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.
The xhci driver supports the following
properties which may be tuned in the xhci driver's
driver.conf(5) file.
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.The xhci driver is only supported on
x86 systems
at this time.
ehci(4D), usba(4D), driver.conf(5), cfgadm(8), cfgadm_usb(8), dladm(8)
| January 10, 2020 | OmniOS |