1 files changed, 21 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
index ab8d76dfaa80..6615fda0abfb 100644
--- a/Documentation/ABI/testing/sysfs-bus-pci
+++ b/Documentation/ABI/testing/sysfs-bus-pci
@@ -250,3 +250,24 @@ Description:
                 valid.  For example, writing a 2 to this file when sriov_numvfs
                 is not 0 and not 2 already will return an error. Writing a 10
                 when the value of sriov_totalvfs is 8 will return an error.
+
+What:           /sys/bus/pci/devices/.../driver_override
+Date:           April 2014
+Contact:        Alex Williamson <alex.williamson@redhat.com>
+Description:
+                This file allows the driver for a device to be specified which
+                will override standard static and dynamic ID matching.  When
+                specified, only a driver with a name matching the value written
+                to driver_override will have an opportunity to bind to the
+                device.  The override is specified by writing a string to the
+                driver_override file (echo pci-stub > driver_override) and
+                may be cleared with an empty string (echo > driver_override).
+                This returns the device to standard matching rules binding.
+                Writing to driver_override does not automatically unbind the
+                device from its current driver or make any attempt to
+                automatically load the specified driver.  If no driver with a
+                matching name is currently loaded in the kernel, the device
+                will not bind to any driver.  This also allows devices to
+                opt-out of driver binding using a driver_override name such as
+                "none".  Only a single driver may be specified in the override,
+                there is no support for parsing delimiters.