This patchset fixes the pmu test errors on Atom server like Sierra Forest (SRF) and Clearwater Forest (CWF). On Intel Atom platforms, the PMU events "Instruction Retired" or "Branch Instruction Retired" may be overcounted for some certain instructions, like FAR CALL/JMP, RETF, IRET, VMENTRY/VMEXIT/VMPTRLD and complex SGX/SMX/CSTATE instructions/flows[1]. In details, for the Atom platforms before Sierra Forest (including Sierra Forest), Both 2 events "Instruction Retired" and "Branch Instruction Retired" would be overcounted on these certain instructions, but for Clearwater Forest only "Instruction Retired" event is overcounted on these instructions. As the overcount issue, pmu test would fail to validate the precise count for these 2 events on SRF and CWF. Patches 1-3/5 detects if the platform has this overcount issue, if so relax the precise count validation for these 2 events. Besides it looks more LLC references are needed on SRF/CWF, so adjust the "LLC references" event count range. Tests: * pmu test passes on Intel GNR/SRF/CWF platforms. Ref: [1]https://edc.intel.com/content/www/us/en/design/products-and-solutions/processors-and-chipsets/sierra-forest/xeon-6700-series-processor-with-e-cores-specification-update/errata-details dongsheng (5): x86/pmu: Add helper to detect Intel overcount issues x86/pmu: Relax precise count validation for Intel overcounted platforms x86/pmu: Fix incorrect masking of fixed counters x86/pmu: Handle instruction overcount issue in overflow test x86/pmu: Expand "llc references" upper limit for broader compatibility lib/x86/processor.h | 17 +++++++++ x86/pmu.c | 93 +++++++++++++++++++++++++++++++++++++++------ 2 files changed, 98 insertions(+), 12 deletions(-) base-commit: 525bdb5d65d51a367341f471eb1bcd505d73c51f -- 2.43.0
