This series adds support for the trace performance monitoring and diagnostics hardware (TPDM and TPDA). It is composed of two major elements. a) Changes for original coresight framework to support for TPDM and TPDA. b) Add driver code for TPDM and TPDA.
Introduction of changes for original coresight framework Support TPDM as new coresight source. Since only STM and ETM are supported as coresight source originally. TPDM is a newly added coresight source. We need to change the original way of saving coresight path to support more types source for coresight driver. The following patch is to add support more coresight sources. coresight: core: Use IDR for non-cpu bound sources' paths.
Introduction of TPDM and TPDA TPDM - The trace performance monitoring and diagnostics monitor or TPDM in short serves as data collection component for various dataset types specified in the QPMDA(Qualcomm performance monitoring and diagnostics architecture) spec. 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. Coresight: Add coresight TPDM source driver dt-bindings: arm: Adds CoreSight TPDM hardware definitions coresight-tpdm: Add DSB dataset support coresight-tpdm: Add integration test support
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 as specified in the QPMDA (Qualcomm performance monitoring and diagnostics architecture) specification. The primary use case of the TPDA is to provide packetization, funneling and timestamping of Monitor data as specified in the QPMDA specification. The following patch is to add driver for TPDA. Coresight: Add TPDA link driver dt-bindings: arm: Adds CoreSight TPDA hardware definitions
The last patch of this series is a device tree modification, which add the TPDM and TPDA configuration to device tree for validating. ARM: dts: msm: Add tpdm mm/prng for sm8250
Once this series patches are applied properly, 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@0/6004000.tpda/tpda0 tpdm0 -> ../../../devices/platform/soc@0/6c08000.mm.tpdm/tpdm0
We can use the commands are similar to the below to validate TPDMs. Enable coresight sink first.
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.
+---------------+ +-------------+ | tpdm@6c08000 | |tpdm@684C000 | +-------|-------+ +------|------+ | | +-------|-------+ | | funnel@6c0b000| | +-------|-------+ | | | +-------|-------+ | |funnel@6c2d000 | | +-------|-------+ | | | | +---------------+ | +----- tpda@6004000 -----------+ +-------|-------+ | +-------|-------+ |funnel@6005000 | +---------------+
This patch series depends on patch series: "[v5,00/14] coresight: Add new API to allocate trace source ID values" https://patchwork.kernel.org/project/linux-arm-kernel/cover/20221101163103.1...
"arm64: dts: qcom: sm8250: Add coresight components" https://patchwork.kernel.org/project/linux-arm-msm/patch/20221114091251.1393...
Changes from V14: 1. coresight-tpda: Add more comments in trace id function. 2. qcom,coresight-tpdm.yaml: Add more comments in description. 3. Push "arm64: dts: qcom: sm8250: Add coresight components" out this series.
Mao Jinlong (8): coresight: core: Use IDR for non-cpu bound sources' paths. Coresight: Add coresight TPDM source driver dt-bindings: arm: Adds CoreSight TPDM hardware coresight-tpdm: Add DSB dataset support coresight-tpdm: Add integration test support Coresight: Add TPDA link driver dt-bindings: arm: Adds CoreSight TPDA hardware definitions arm64: dts: qcom: sm8250: Add tpdm mm/prng
.../testing/sysfs-bus-coresight-devices-tpdm | 13 + .../bindings/arm/qcom,coresight-tpda.yaml | 129 +++++++++ .../bindings/arm/qcom,coresight-tpdm.yaml | 93 +++++++ MAINTAINERS | 1 + arch/arm64/boot/dts/qcom/sm8250.dtsi | 173 ++++++++++++ drivers/hwtracing/coresight/Kconfig | 23 ++ drivers/hwtracing/coresight/Makefile | 2 + drivers/hwtracing/coresight/coresight-core.c | 42 ++- drivers/hwtracing/coresight/coresight-tpda.c | 211 ++++++++++++++ drivers/hwtracing/coresight/coresight-tpda.h | 35 +++ drivers/hwtracing/coresight/coresight-tpdm.c | 259 ++++++++++++++++++ drivers/hwtracing/coresight/coresight-tpdm.h | 62 +++++ include/linux/coresight.h | 1 + 13 files changed, 1032 insertions(+), 12 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm create mode 100644 Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml create mode 100644 Documentation/devicetree/bindings/arm/qcom,coresight-tpdm.yaml create mode 100644 drivers/hwtracing/coresight/coresight-tpda.c create mode 100644 drivers/hwtracing/coresight/coresight-tpda.h create mode 100644 drivers/hwtracing/coresight/coresight-tpdm.c create mode 100644 drivers/hwtracing/coresight/coresight-tpdm.h