To allow perf tool to identify a specific implementation of a PMU for event alias matching and metric support, expose a per-PMU identifier file. There is no standard format for the identifier string. It just should be unique per HW implementation. Typical methods to retrieve the information for the identifier string can include: - Hardcoding in the driver, matched via DT bindings compat string, ACPI HID, or similar - Directly from DT bindings property - Read from some HW identification register In this series, for the SMMUv3 PMU and HiSi uncore drivers, a HW ID register is read for the identifier. For the imx8 ddr driver, the identifier is hardcoded, matched via DT compat string. Joakim Zhang (2): bindings/perf/imx-ddr: update compatible string perf/imx_ddr: Add system PMU identifier for userspace John Garry (2): drivers/perf: hisi: Add identifier sysfs file perf/smmuv3: Support sysfs identifier file .../devicetree/bindings/perf/fsl-imx-ddr.txt | 3 ++ drivers/perf/arm_smmuv3_pmu.c | 39 ++++++++++++++++ drivers/perf/fsl_imx8_ddr_perf.c | 45 +++++++++++++++++-- drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c | 16 +++++++ drivers/perf/hisilicon/hisi_uncore_hha_pmu.c | 16 +++++++ drivers/perf/hisilicon/hisi_uncore_l3c_pmu.c | 16 +++++++ drivers/perf/hisilicon/hisi_uncore_pmu.c | 10 +++++ drivers/perf/hisilicon/hisi_uncore_pmu.h | 7 +++ 8 files changed, 149 insertions(+), 3 deletions(-) -- 2.26.2
