selftests/powerpc/pmu: Add interface test for extended reg support
The testcase uses check_extended_regs_support and perf_get_platform_reg_mask function to check if the platform has extended reg support. This will help to check if sampling pmu selftest is enabled or not for a given platform. Signed-off-by:Kajol Jain <kjain@linux.ibm.com> Signed-off-by:
Athira Rajeev <atrajeev@linux.vnet.ibm.com> Signed-off-by:
Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/20250113075858.45137-4-atrajeev@linux.vnet.ibm.com
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