This erratum is found when system hang reported by internal benchmarking team while they were trying ThunderX2 PMU uncore events along with cpu/memory intensive applications like stream, SPECjbb, SPECInt, etc. The workaround is to disable event multiplexing. The current Perf core does not provide any provision to PMUs to disable event multiplexing. In first patch, adding PMU capability to disable event multiplexing in perf core. In second patch, setting the capability to disable for the ThunderX2 UNCORE PMUs. Ganapatrao Prabhakerrao Kulkarni (2): perf/core: Adding capability to disable PMUs event multiplexing Thunderx2, uncore: Add workaround for ThunderX2 erratum 221 Documentation/admin-guide/perf/thunderx2-pmu.rst | 9 +++++++++ drivers/perf/thunderx2_pmu.c | 3 ++- include/linux/perf_event.h | 1 + kernel/events/core.c | 8 ++++++++ 4 files changed, 20 insertions(+), 1 deletion(-) -- 2.17.1
