From: Zhang Rui Date: Thu, 4 Feb 2021 16:18:15 +0000 (+0800) Subject: perf/x86/rapl: Only check lower 32bits for RAPL energy counters X-Git-Tag: v5.15.73~12579^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b6f78d3fba7f605f673185d7292d84af7576fdc1;p=platform%2Fkernel%2Flinux-rpi.git perf/x86/rapl: Only check lower 32bits for RAPL energy counters In the RAPL ENERGY_COUNTER MSR, only the lower 32bits represent the energy counter. On previous platforms, the higher 32bits are reverved and always return Zero. But on Intel SapphireRapids platform, the higher 32bits are reused for other purpose and return non-zero value. Thus check the lower 32bits only for these ENERGY_COUTNER MSRs, to make sure the RAPL PMU events are not added erroneously when higher 32bits contain non-zero value. Signed-off-by: Zhang Rui Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Andi Kleen Link: https://lkml.kernel.org/r/20210204161816.12649-2-rui.zhang@intel.com --- diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c index 7dbbeaacd995..7ed25b2ba05f 100644 --- a/arch/x86/events/rapl.c +++ b/arch/x86/events/rapl.c @@ -523,12 +523,15 @@ static bool test_msr(int idx, void *data) return test_bit(idx, (unsigned long *) data); } +/* Only lower 32bits of the MSR represents the energy counter */ +#define RAPL_MSR_MASK 0xFFFFFFFF + static struct perf_msr intel_rapl_msrs[] = { - [PERF_RAPL_PP0] = { MSR_PP0_ENERGY_STATUS, &rapl_events_cores_group, test_msr }, - [PERF_RAPL_PKG] = { MSR_PKG_ENERGY_STATUS, &rapl_events_pkg_group, test_msr }, - [PERF_RAPL_RAM] = { MSR_DRAM_ENERGY_STATUS, &rapl_events_ram_group, test_msr }, - [PERF_RAPL_PP1] = { MSR_PP1_ENERGY_STATUS, &rapl_events_gpu_group, test_msr }, - [PERF_RAPL_PSYS] = { MSR_PLATFORM_ENERGY_STATUS, &rapl_events_psys_group, test_msr }, + [PERF_RAPL_PP0] = { MSR_PP0_ENERGY_STATUS, &rapl_events_cores_group, test_msr, false, RAPL_MSR_MASK }, + [PERF_RAPL_PKG] = { MSR_PKG_ENERGY_STATUS, &rapl_events_pkg_group, test_msr, false, RAPL_MSR_MASK }, + [PERF_RAPL_RAM] = { MSR_DRAM_ENERGY_STATUS, &rapl_events_ram_group, test_msr, false, RAPL_MSR_MASK }, + [PERF_RAPL_PP1] = { MSR_PP1_ENERGY_STATUS, &rapl_events_gpu_group, test_msr, false, RAPL_MSR_MASK }, + [PERF_RAPL_PSYS] = { MSR_PLATFORM_ENERGY_STATUS, &rapl_events_psys_group, test_msr, false, RAPL_MSR_MASK }, }; /*