linux-kernel - [PATCH v2 0/2] perf: ARM CoreSight PMU support

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Date:   Sun, 15 May 2022 11:30:42 -0500
From:   Besar Wicaksono <bwicaksono@...dia.com>
To:     <robin.murphy@....com>, <catalin.marinas@....com>,
        <will@...nel.org>, <mark.rutland@....com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <sudeep.holla@....com>, <thanu.rangarajan@....com>,
        <Michael.Williams@....com>, <suzuki.poulose@....com>,
        <treding@...dia.com>, <jonathanh@...dia.com>, <vsethi@...dia.com>,
        Besar Wicaksono <bwicaksono@...dia.com>
Subject: [PATCH v2 0/2] perf: ARM CoreSight PMU support

Add driver support for ARM CoreSight PMU device and event attributes for NVIDIA
implementation. The code is based on ARM Coresight PMU architecture and ACPI ARM
Performance Monitoring Unit table (APMT) specification below:
 * ARM Coresight PMU:
        https://developer.arm.com/documentation/ihi0091/latest
 * APMT: https://developer.arm.com/documentation/den0117/latest

Notes:
 * There is a concern on the naming of the PMU device.
   Currently the driver is probing "arm-coresight-pmu" device, however the APMT
   spec supports different kinds of CoreSight PMU based implementation. So it is
   open for discussion if the name can stay or a "generic" name is required.
   Please see the following thread:
   http://lists.infradead.org/pipermail/linux-arm-kernel/2022-May/740485.html

Changes from v1:
 * Remove CPU arch dependency.
 * Remove 32-bit read/write helper function and just use read/writel.
 * Add .is_visible into event attribute to filter out cycle counter event.
 * Update pmiidr matching.
 * Remove read-modify-write on PMCR since the driver only writes to PMCR.E.
 * Assign default cycle event outside the 32-bit PMEVTYPER range.
 * Rework the active event and used counter tracking.

Besar Wicaksono (2):
  perf: coresight_pmu: Add support for ARM CoreSight PMU driver
  perf: coresight_pmu: Add support for NVIDIA SCF and MCF attribute

 arch/arm64/configs/defconfig                  |    1 +
 drivers/perf/Kconfig                          |    2 +
 drivers/perf/Makefile                         |    1 +
 drivers/perf/coresight_pmu/Kconfig            |   11 +
 drivers/perf/coresight_pmu/Makefile           |    7 +
 .../perf/coresight_pmu/arm_coresight_pmu.c    | 1271 +++++++++++++++++
 .../perf/coresight_pmu/arm_coresight_pmu.h    |  171 +++
 .../coresight_pmu/arm_coresight_pmu_nvidia.c  |  292 ++++
 .../coresight_pmu/arm_coresight_pmu_nvidia.h  |   17 +
 9 files changed, 1773 insertions(+)
 create mode 100644 drivers/perf/coresight_pmu/Kconfig
 create mode 100644 drivers/perf/coresight_pmu/Makefile
 create mode 100644 drivers/perf/coresight_pmu/arm_coresight_pmu.c
 create mode 100644 drivers/perf/coresight_pmu/arm_coresight_pmu.h
 create mode 100644 drivers/perf/coresight_pmu/arm_coresight_pmu_nvidia.c
 create mode 100644 drivers/perf/coresight_pmu/arm_coresight_pmu_nvidia.h

-- 
2.17.1