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+What: /sys/bus/intel_th/devices/<intel_th_id>-<device><id>/active
+Date: June 2015
+KernelVersion: 4.3
+Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
+Description: (RW) Writes of 1 or 0 enable or disable trace output to this
+ output device. Reads return current status. Requires that the
+ correstponding output port driver be loaded.
+
+What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/port
+Date: June 2015
+KernelVersion: 4.3
+Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
+Description: (RO) Port number, corresponding to this output device on the
+ switch (GTH) or "unassigned" if the corresponding output
+ port driver is not loaded.