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

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Date:   Mon, 9 May 2022 10:28:44 +0100
From:   Will Deacon <will@...nel.org>
To:     Besar Wicaksono <bwicaksono@...dia.com>
Cc:     catalin.marinas@....com, mark.rutland@....com,
        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
Subject: Re: [PATCH 0/2] perf: ARM CoreSight PMU support

On Sun, May 08, 2022 at 07:28:08PM -0500, Besar Wicaksono wrote:
> 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
> 
> 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            |   10 +
>  drivers/perf/coresight_pmu/Makefile           |    7 +
>  .../perf/coresight_pmu/arm_coresight_pmu.c    | 1317 +++++++++++++++++
>  .../perf/coresight_pmu/arm_coresight_pmu.h    |  147 ++
>  .../coresight_pmu/arm_coresight_pmu_nvidia.c  |  300 ++++
>  .../coresight_pmu/arm_coresight_pmu_nvidia.h  |   17 +
>  9 files changed, 1802 insertions(+)

How does this interact with all the stuff we have under
drivers/hwtracing/coresight/?

Will