[PATCH v2 0/4] perf drivers: Add sysfs identifier file

[John Garry <john.garry@huawei.com>]

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(-)

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2.26.2