linux-kernel - [PATCH v17 8/9] Documentation: trace: Add documentation for TPDM and TPDA

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Message-ID: <20230117145708.16739-9-quic_jinlmao@quicinc.com>
Date:   Tue, 17 Jan 2023 06:57:07 -0800
From:   Mao Jinlong <quic_jinlmao@...cinc.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        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>
CC:     Mao Jinlong <quic_jinlmao@...cinc.com>,
        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>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        Tao Zhang <quic_taozha@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Hao Zhang <quic_hazha@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <andersson@...nel.org>
Subject: [PATCH v17 8/9] Documentation: trace: Add documentation for TPDM and TPDA

Add documentation for the TPDM and TPDA under trace/coresight.

Signed-off-by: Mao Jinlong <quic_jinlmao@...cinc.com>
---
 .../trace/coresight/coresight-tpda.rst        | 52 +++++++++++++++++++
 .../trace/coresight/coresight-tpdm.rst        | 43 +++++++++++++++
 2 files changed, 95 insertions(+)
 create mode 100644 Documentation/trace/coresight/coresight-tpda.rst
 create mode 100644 Documentation/trace/coresight/coresight-tpdm.rst

diff --git a/Documentation/trace/coresight/coresight-tpda.rst b/Documentation/trace/coresight/coresight-tpda.rst
new file mode 100644
index 000000000000..350dad4eda47
--- /dev/null
+++ b/Documentation/trace/coresight/coresight-tpda.rst
@@ -0,0 +1,52 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==============================
+The trace performance monitoring and diagnostics aggregator(TPDA).
+==============================
+
+    :Author:   Jinlong Mao <quic_jinlmao@...cinc.com>
+    :Date:     January 2023
+
+Hardware Description
+--------------------
+
+TPDA - The trace performance monitoring and diagnostics aggregator or
+TPDA in short serves as an arbitration and packetization engine for the
+performance monitoring and diagnostics network specification.
+The primary use case of the TPDA is to provide packetization, funneling
+and timestamping of Monitor data.
+
+
+Sysfs files and directories
+---------------------------
+Root: ``/sys/bus/coresight/devices/tpda<N>``
+
+Config details
+---------------------------
+
+The tpdm and tpda nodes should be observed at the coresight path
+"/sys/bus/coresight/devices".
+e.g.
+/sys/bus/coresight/devices # ls -l | grep tpd
+tpda0 -> ../../../devices/platform/soc@...004000.tpda/tpda0
+tpdm0 -> ../../../devices/platform/soc@...c08000.mm.tpdm/tpdm0
+
+We can use the commands are similar to the below to validate TPDMs.
+Enable coresight sink first. The port of tpda which is connected to
+the tpdm will be enabled after commands below.
+
+echo 1 > /sys/bus/coresight/devices/tmc_etf0/enable_sink
+echo 1 > /sys/bus/coresight/devices/tpdm0/enable_source
+echo 1 > /sys/bus/coresight/devices/tpdm0/integration_test
+echo 2 > /sys/bus/coresight/devices/tpdm0/integration_test
+
+The test data will be collected in the coresight sink which is enabled.
+If rwp register of the sink is keeping updating when do
+integration_test (by cat tmc_etf0/mgmt/rwp), it means there is data
+generated from TPDM to sink.
+
+There must be a tpda between tpdm and the sink. When there are some
+other trace event hw components in the same HW block with tpdm, tpdm
+and these hw components will connect to the coresight funnel. When
+there is only tpdm trace hw in the HW block, tpdm will connect to
+tpda directly.
diff --git a/Documentation/trace/coresight/coresight-tpdm.rst b/Documentation/trace/coresight/coresight-tpdm.rst
new file mode 100644
index 000000000000..4ba40b0db550
--- /dev/null
+++ b/Documentation/trace/coresight/coresight-tpdm.rst
@@ -0,0 +1,43 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==============================
+Trace performance monitoring and diagnostics monitor(TPDM).
+==============================
+
+    :Author:   Jinlong Mao <quic_jinlmao@...cinc.com>
+    :Date:     January 2023
+
+Hardware Description
+--------------------
+TPDM - The trace performance monitoring and diagnostics monitor or TPDM in
+short serves as data collection component for various dataset types.
+The primary use case of the TPDM is to collect data from different data
+sources and send it to a TPDA for packetization, timestamping and funneling.
+
+Sysfs files and directories
+---------------------------
+Root: ``/sys/bus/coresight/devices/tpdm<N>``
+
+----
+
+:File:            ``enable_source`` (RW)
+:Notes:
+    - > 0 : enable the datasets of TPDM.
+
+    - = 0 : disable the datasets of TPDM.
+
+:Syntax:
+    ``echo 1 > enable_source``
+
+----
+
+:File:            ``integration_test`` (wo)
+:Notes:
+    Integration test will generate test data for tpdm.
+
+:Syntax:
+    ``echo value > integration_test``
+
+    value -  1 or 2.
+
+----
-- 
2.39.0