From 5d7107c72796df3be2ba574f1cf6eca75c60d5ef Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Fri, 26 May 2023 10:58:23 +0100 Subject: perf: CXL Performance Monitoring Unit driver CXL rev 3.0 introduces a standard performance monitoring hardware block to CXL. Instances are discovered using CXL Register Locator DVSEC entries. Each CXL component may have multiple PMUs. This initial driver supports a subset of types of counter. It supports counters that are either fixed or configurable, but requires that they support the ability to freeze and write value whilst frozen. Development done with QEMU model which will be posted shortly. Example: $ perf stat -a -e cxl_pmu_mem0.0/h2d_req_snpcur/ -e cxl_pmu_mem0.0/h2d_req_snpdata/ -e cxl_pmu_mem0.0/clock_ticks/ sleep 1 Performance counter stats for 'system wide': 96,757,023,244,321 cxl_pmu_mem0.0/h2d_req_snpcur/ 96,757,023,244,365 cxl_pmu_mem0.0/h2d_req_snpdata/ 193,514,046,488,653 cxl_pmu_mem0.0/clock_ticks/ 1.090539600 seconds time elapsed Reviewed-by: Dave Jiang Reviewed-by: Kan Liang Signed-off-by: Jonathan Cameron Link: https://lore.kernel.org/r/20230526095824.16336-5-Jonathan.Cameron@huawei.com Signed-off-by: Dan Williams --- drivers/perf/Makefile | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/perf/Makefile') diff --git a/drivers/perf/Makefile b/drivers/perf/Makefile index dabc859540ce..f1d7ce9da275 100644 --- a/drivers/perf/Makefile +++ b/drivers/perf/Makefile @@ -24,3 +24,4 @@ obj-$(CONFIG_APPLE_M1_CPU_PMU) += apple_m1_cpu_pmu.o obj-$(CONFIG_ALIBABA_UNCORE_DRW_PMU) += alibaba_uncore_drw_pmu.o obj-$(CONFIG_ARM_CORESIGHT_PMU_ARCH_SYSTEM_PMU) += arm_cspmu/ obj-$(CONFIG_MESON_DDR_PMU) += amlogic/ +obj-$(CONFIG_CXL_PMU) += cxl_pmu.o -- cgit v1.2.3