linux-kernel - Re: [PATCH v1 0/3] Add support to configure Coresight Dummy subunit

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Message-ID: <0db33881-7978-41c9-45e3-63dc2ed7be4f@arm.com>
Date:   Thu, 16 Mar 2023 10:55:27 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Hao Zhang <quic_hazha@...cinc.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Konrad Dybcio <konradybcio@...il.com>,
        Mike Leach <mike.leach@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Jonathan Corbet <corbet@....net>
Cc:     Leo Yan <leo.yan@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Jinlong Mao <quic_jinlmao@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        Tao Zhang <quic_taozha@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <andersson@...nel.org>,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v1 0/3] Add support to configure Coresight Dummy subunit

On 16/03/2023 03:20, Hao Zhang wrote:
> Introduction of Coresight Dummy subunit
> The Coresight Dummy subunit is for Coresight Dummy component, there are some
> specific Coresight devices that HLOS don't have permission to access. Such as

What is HLOS ?

> some TPDMs, they would be configured in NON-HLOS side, but it's necessary to

What is NON-HLOS ?

> build Coresight path for it to debug. So there need driver to register dummy
> devices as Coresight devices.

Build a path for who to debug ? If this is used by some privileged
software, shouldn't that do all of the work ?

Suzuki

> 
> Commit link:
> https://git.codelinaro.org/clo/linux-kernel/coresight/-/tree/coresight-dummy
> 
> Hao Zhang (3):
>    Coresight: Add coresight dummy driver
>    dt-bindings: arm: Add Coresight Dummy Trace YAML schema
>    Documentation: trace: Add documentation for Coresight Dummy Trace
> 
>   .../bindings/arm/qcom,coresight-dummy.yaml    | 129 +++++++++++++
>   .../trace/coresight/coresight-dummy.rst       |  58 ++++++
>   drivers/hwtracing/coresight/Kconfig           |  11 ++
>   drivers/hwtracing/coresight/Makefile          |   1 +
>   drivers/hwtracing/coresight/coresight-dummy.c | 176 ++++++++++++++++++
>   5 files changed, 375 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/arm/qcom,coresight-dummy.yaml
>   create mode 100644 Documentation/trace/coresight/coresight-dummy.rst
>   create mode 100644 drivers/hwtracing/coresight/coresight-dummy.c
>