summaryrefslogtreecommitdiffstats
path: root/Documentation/ABI/testing/sysfs-bus-pci
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/ABI/testing/sysfs-bus-pci')
-rw-r--r--Documentation/ABI/testing/sysfs-bus-pci21
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.