All PMU architectural events are available to the ETM through
the extended input facility. See the ARM® Architectural
Reference Manual ARMv8 for more information about PMU
The ETM uses four extended external input selectors to access
the PMU events. Each selector can independently select one of the
PMU events, that are then active for the cycles where the relevant
events occur. These selected events can then be accessed by any
of the event registers within the ETM.