From: Zhengjun Xing <zhengjun.xing@xxxxxxxxxxxxxxx> The user recently report a perf issue in the ICX platform, when test by perf event “uncore_imc_x/cas_count_write”,the write bandwidth is always very small (only 0.38MB/s), it is caused by the wrong "umask" for the "cas_count_write" event. When double-checking, find "cas_count_read" also is wrong. The public document for ICX uncore: https://www.intel.com/content/www/us/en/develop/download/3rd-gen-intel-xeon-processor-scalable-uncore-pm.html On page 142, Table 2-143, defines Unit Masks for CAS_COUNT: RD b00001111 WR b00110000 So Corrected both "cas_count_read" and "cas_count_write" for ICX. Old settings: hswep_uncore_imc_events INTEL_UNCORE_EVENT_DESC(cas_count_read, "event=0x04,umask=0x03") INTEL_UNCORE_EVENT_DESC(cas_count_write, "event=0x04,umask=0x0c") New settings: snr_uncore_imc_events INTEL_UNCORE_EVENT_DESC(cas_count_read, "event=0x04,umask=0x0f") INTEL_UNCORE_EVENT_DESC(cas_count_write, "event=0x04,umask=0x30"), Fixes: 2b3b76b5ec67 ("perf/x86/intel/uncore: Add Ice Lake server uncore support") Reviewed-by: Adrian Hunter <adrian.hunter@xxxxxxxxx> Signed-off-by: Zhengjun Xing <zhengjun.xing@xxxxxxxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx --- Change log: v3: * Add change log v2: * Add stable tag arch/x86/events/intel/uncore_snbep.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c index 5ddc0f30db6f..a6fd8eb410a9 100644 --- a/arch/x86/events/intel/uncore_snbep.c +++ b/arch/x86/events/intel/uncore_snbep.c @@ -5468,7 +5468,7 @@ static struct intel_uncore_type icx_uncore_imc = { .fixed_ctr_bits = 48, .fixed_ctr = SNR_IMC_MMIO_PMON_FIXED_CTR, .fixed_ctl = SNR_IMC_MMIO_PMON_FIXED_CTL, - .event_descs = hswep_uncore_imc_events, + .event_descs = snr_uncore_imc_events, .perf_ctr = SNR_IMC_MMIO_PMON_CTR0, .event_ctl = SNR_IMC_MMIO_PMON_CTL0, .event_mask = SNBEP_PMON_RAW_EVENT_MASK, -- 2.25.1
