Performance monitoring unit

The DSP subsystem has the PMU (Performance Monitoring Unit) with counters to track hardware events (called PMU events). The HAP PMU framework exposes a set of APIs to read these PMU counters configured with specified PMU events. PMU events are Hexagon DSP architecture specific and the most common PMU events are briefly described in the Hexagon DSP architecture documentation. The itrace library's header file itrace_dsp_events_pmu.h provides a complete list of all available public PMU events alongside their descriptions.

NOTE:

• aDSP and cDSP DCVS relies on a set of PMU events to monitor DSP statistics and make necessary decisions. Using these HAP APIs to register PMU events results in DCVS no longer being able to track these events. This might lead DCVS to making incorrect decisions.
• HAP PMU APIs only work on debug-enabled devices.

The HAP PMU APIs are not accessible from unsigned PD.

Supported chipsets

SM8250 and beyond

Framework APIs

Header file: HAP_user_pmu.h