PCI: Allow numa_node override via sysfs

[pandora-kernel.git] / Documentation / ABI / testing / sysfs-bus-pci

diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
index ee6c040..b3bc50f 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-pci
+++ b/Documentation/ABI/testing/sysfs-bus-pci
@@ -281,3 +281,16 @@ Description:
                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.
+
+What:          /sys/bus/pci/devices/.../numa_node
+Date:          Oct 2014
+Contact:       Prarit Bhargava <prarit@redhat.com>
+Description:
+               This file contains the NUMA node to which the PCI device is
+               attached, or -1 if the node is unknown.  The initial value
+               comes from an ACPI _PXM method or a similar firmware
+               source.  If that is missing or incorrect, this file can be
+               written to override the node.  In that case, please report
+               a firmware bug to the system vendor.  Writing to this file
+               taints the kernel with TAINT_FIRMWARE_WORKAROUND, which
+               reduces the supportability of your system.