selftests/powerpc/pmu: Add utility functions to post process the mmap buffer
Add couple of basic utility functions to post process the mmap buffer. It includes function to read the total number of samples present in the mmap buffer and function to get the address of the first sample. Add function "get_intr_regs" which will return pointer to interrupt registers present in the sample, incase sample type PERF_SAMPLE_REGS_INTR is set. Add functions "get_reg_value" which can be used to read any interrupt register value from a given sample. Signed-off-by:Kajol Jain <kjain@linux.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220127072012.662451-5-kjain@linux.ibm.com
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