selftests/powerpc/pmu/: Add interface test for mmcr1_comb field
The testcase uses event code "0x26880" to verify the settings for different fields in Monitor Mode Control Register 1 (MMCR1). The field include PMCxCOMB. Checks if this field are translated correctly via perf interface to MMCR1 Add selftest for mmcr1 comb field. Signed-off-by:Athira Rajeev <atrajeev@linux.vnet.ibm.com> [mpe: Add error checking, drop GET_MMCR_FIELD, add to .gitignore] Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220127072012.662451-16-kjain@linux.ibm.com
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