+ PERF_CODE (\r
+ AsciiSPrint (PerfToken, sizeof(PerfToken), "S%04xB%02xD%02xF%01x", Segment, SourceId.Bits.Bus, SourceId.Bits.Device, SourceId.Bits.Function);\r
+ Identifier = (Segment << 16) | SourceId.Uint16;\r
+ PERF_START_EX (gImageHandle, PerfToken, "IntelVTD", 0, Identifier);\r
+ );\r
+\r