PCI: document SR-IOV sysfs entries

Reviewed-by: Randy Dunlap <rdunlap@xenotime.net>
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
index 3d29793..d175a2a 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-pci
+++ b/Documentation/ABI/testing/sysfs-bus-pci
@@ -68,3 +68,30 @@ Description:
                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.