xref: /openbmc/linux/Documentation/ABI/testing/sysfs-bus-pci (revision 738a6396)

What:		/sys/bus/pci/drivers/.../bind
Date:		December 2003
Contact:	linux-pci@vger.kernel.org
Description:
		Writing a device location to this file will cause
		the driver to attempt to bind to the device found at
		this location.	This is useful for overriding default
		bindings.  The format for the location is: DDDD:BB:DD.F.
		That is Domain:Bus:Device.Function and is the same as
		found in /sys/bus/pci/devices/.  For example:
		# echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/bind
		(Note: kernels before 2.6.28 may require echo -n).

What:		/sys/bus/pci/drivers/.../unbind
Date:		December 2003
Contact:	linux-pci@vger.kernel.org
Description:
		Writing a device location to this file will cause the
		driver to attempt to unbind from the device found at
		this location.	This may be useful when overriding default
		bindings.  The format for the location is: DDDD:BB:DD.F.
		That is Domain:Bus:Device.Function and is the same as
		found in /sys/bus/pci/devices/. For example:
		# echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/unbind
		(Note: kernels before 2.6.28 may require echo -n).

What:		/sys/bus/pci/drivers/.../new_id
Date:		December 2003
Contact:	linux-pci@vger.kernel.org
Description:
		Writing a device ID to this file will attempt to
		dynamically add a new device ID to a PCI device driver.
		This may allow the driver to support more hardware than
		was included in the driver's static device ID support
		table at compile time.  The format for the device ID is:
		VVVV DDDD SVVV SDDD CCCC MMMM PPPP.  That is Vendor ID,
		Device ID, Subsystem Vendor ID, Subsystem Device ID,
		Class, Class Mask, and Private Driver Data.  The Vendor ID
		and Device ID fields are required, the rest are optional.
		Upon successfully adding an ID, the driver will probe
		for the device and attempt to bind to it.  For example:
		# echo "8086 10f5" > /sys/bus/pci/drivers/foo/new_id

What:		/sys/bus/pci/drivers/.../remove_id
Date:		February 2009
Contact:	Chris Wright <chrisw@sous-sol.org>
Description:
		Writing a device ID to this file will remove an ID
		that was dynamically added via the new_id sysfs entry.
		The format for the device ID is:
		VVVV DDDD SVVV SDDD CCCC MMMM.	That is Vendor ID, Device
		ID, Subsystem Vendor ID, Subsystem Device ID, Class,
		and Class Mask.  The Vendor ID and Device ID fields are
		required, the rest are optional.  After successfully
		removing an ID, the driver will no longer support the
		device.  This is useful to ensure auto probing won't
		match the driver to the device.  For example:
		# echo "8086 10f5" > /sys/bus/pci/drivers/foo/remove_id

What:		/sys/bus/pci/rescan
Date:		January 2009
Contact:	Linux PCI developers <linux-pci@vger.kernel.org>
Description:
		Writing a non-zero value to this attribute will
		force a rescan of all PCI buses in the system, and
		re-discover previously removed devices.
		Depends on CONFIG_HOTPLUG.

What:		/sys/bus/pci/devices/.../remove
Date:		January 2009
Contact:	Linux PCI developers <linux-pci@vger.kernel.org>
Description:
		Writing a non-zero value to this attribute will
		hot-remove the PCI device and any of its children.
		Depends on CONFIG_HOTPLUG.

What:		/sys/bus/pci/devices/.../rescan
Date:		January 2009
Contact:	Linux PCI developers <linux-pci@vger.kernel.org>
Description:
		Writing a non-zero value to this attribute will
		force a rescan of the device's parent bus and all
		child buses, and re-discover devices removed earlier
		from this part of the device tree.
		Depends on CONFIG_HOTPLUG.

What:		/sys/bus/pci/devices/.../vpd
Date:		February 2008
Contact:	Ben Hutchings <bhutchings@solarflare.com>
Description:
		A file named vpd in a device directory will be a
		binary file containing the Vital Product Data for the
		device.  It should follow the VPD format defined in
		PCI Specification 2.1 or 2.2, but users should consider
		that some devices may have malformatted data.  If the
		underlying VPD has a writable section then the
		corresponding section of this file will be writable.

What:		/sys/bus/pci/devices/.../virtfnN
Date:		March 2009
Contact:	Yu Zhao <yu.zhao@intel.com>
Description:
		This symbolic link appears when hardware supports the SR-IOV
		capability and the Physical Function driver has enabled it.
		The symbolic link points to the PCI device sysfs entry of the
		Virtual Function whose index is N (0...MaxVFs-1).

What:		/sys/bus/pci/devices/.../dep_link
Date:		March 2009
Contact:	Yu Zhao <yu.zhao@intel.com>
Description:
		This symbolic link appears when hardware supports the SR-IOV
		capability and the Physical Function driver has enabled it,
		and this device has vendor specific dependencies with others.
		The symbolic link points to the PCI device sysfs entry of
		Physical Function this device depends on.

What:		/sys/bus/pci/devices/.../physfn
Date:		March 2009
Contact:	Yu Zhao <yu.zhao@intel.com>
Description:
		This symbolic link appears when a device is a Virtual Function.
		The symbolic link points to the PCI device sysfs entry of the
		Physical Function this device associates with.