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Subjectperf documentation: update Documentation/ABI/testing with missing perf-related files

Add documentation for various files perf_event creates under
/sys/bus/event_source/devices/<dev>/

Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>

diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices b/Documentation/ABI/testing/sysfs-bus-event_source-devices
new file mode 100644
index 0000000..ffa2e4b
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices
@@ -0,0 +1,50 @@
+What: /sys/bus/event_source/devices/<dev>/cpumask
+
+Date: 2012/09/10
+
+Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
+
+Description: This value holds a representative core for each
+ socket in a system. It is meant to help when
+ creating a perf_event event for socket-wide events
+ like uncore and northbridge events.
+
+ The format is a comma separated list of cpu numbers,
+ one for each socket in the system that the PMU in
+ question can run on.
+
+ For example, on a two-socket Sandybridge-EP machine and
+ the cbox0 uncore the value of the file will be:
+ 0,8
+
+
+
+What: /sys/bus/event_source/devices/cpu/rdpmc
+
+Date: 2011/11/20
+
+Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
+
+Description: Indicates whether a CPU allows userspace "rdpmc"
+ instructions (unprivileged reads of the performance
+ counter MSRs).
+
+ You can echo 0 to this value to disable user rdpmc
+ access.
+
+
+
+What: /sys/bus/event_source/devices/<dev>/type
+
+Date: 2013/01/08
+
+Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
+
+Description: This value holds the PMU (Performance Monitor Unit) type
+ value that is passed into the perf_event_open()
+ attr:type field when opening an event.
+
+ The value is a decimal integer.
+
+
+

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