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

[Vince Weaver]

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

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

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@xxxxxxxxxxxxxxx>
+
+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@xxxxxxxxxxxxxxx>
+
+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@xxxxxxxxxxxxxxx>
+
+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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