53 lines
2.0 KiB
ReStructuredText
53 lines
2.0 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0
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=================================================================
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The trace performance monitoring and diagnostics aggregator(TPDA)
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=================================================================
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:Author: Jinlong Mao <quic_jinlmao@quicinc.com>
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:Date: January 2023
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Hardware Description
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--------------------
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TPDA - The trace performance monitoring and diagnostics aggregator or
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TPDA in short serves as an arbitration and packetization engine for the
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performance monitoring and diagnostics network specification.
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The primary use case of the TPDA is to provide packetization, funneling
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and timestamping of Monitor data.
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Sysfs files and directories
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---------------------------
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Root: ``/sys/bus/coresight/devices/tpda<N>``
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Config details
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---------------------------
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The tpdm and tpda nodes should be observed at the coresight path
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"/sys/bus/coresight/devices".
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e.g.
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/sys/bus/coresight/devices # ls -l | grep tpd
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tpda0 -> ../../../devices/platform/soc@0/6004000.tpda/tpda0
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tpdm0 -> ../../../devices/platform/soc@0/6c08000.mm.tpdm/tpdm0
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We can use the commands are similar to the below to validate TPDMs.
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Enable coresight sink first. The port of tpda which is connected to
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the tpdm will be enabled after commands below.
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echo 1 > /sys/bus/coresight/devices/tmc_etf0/enable_sink
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echo 1 > /sys/bus/coresight/devices/tpdm0/enable_source
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echo 1 > /sys/bus/coresight/devices/tpdm0/integration_test
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echo 2 > /sys/bus/coresight/devices/tpdm0/integration_test
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The test data will be collected in the coresight sink which is enabled.
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If rwp register of the sink is keeping updating when do
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integration_test (by cat tmc_etf0/mgmt/rwp), it means there is data
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generated from TPDM to sink.
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There must be a tpda between tpdm and the sink. When there are some
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other trace event hw components in the same HW block with tpdm, tpdm
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and these hw components will connect to the coresight funnel. When
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there is only tpdm trace hw in the HW block, tpdm will connect to
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tpda directly.
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