On 5/1/2024 9:02 PM, Sean Christopherson wrote: > On Wed, May 01, 2024, Manali Shukla wrote: >> PMU event filter test fails on zen4 architecture because of >> unavailability of family and model check for zen4 in use_amd_pmu(). >> So, add family and model check for zen4 architecture in use_amd_pmu(). > > Is there a less ugly way to detect that 0xc2,0 == "branch instructions > retired"? > E.g. can we instead check for v2 PMU support, or are there no guarantees going > forward? Pivoting on FMS is so painful :-(
We have confirmed with the hardware team that 0xc2,0 == "branch instructions retired" is always true going forward, we intend to maintain backward compatibility for branch instruction retired. Since event 0xc2 is supported on all currently released F17h+ processors as branch instructions retired, we can check for "family >= 0x17" for all Zen and its successors instead of checking them individually in pmu_event_filter_test.c. - Manali
