Commit 01f96b81 authored Aug 16, 2025 by Mao Jinlong Committed by Suzuki K Poulose Sep 23, 2025

coresight: Add label sysfs node support



For some coresight components like CTI and TPDM, there could be
numerous of them. From the node name, we can only get the type and
register address of the component. We can't identify the HW or the
system the component belongs to. Add label sysfs node support for
showing the intuitive name of the device.

Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
Reviewed-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250816072529.3716968-3-quic_jinlmao@quicinc.com

parent 1ad38ef4

Documentation/ABI/testing/sysfs-bus-coresight-devices-cti

+6 −0

Original line number	Diff line number	Diff line
		@@ -239,3 +239,9 @@ Date: March 2020
		KernelVersion: 5.7
		Contact: Mike Leach or Mathieu Poirier
		Description: (Write) Clear all channel / trigger programming.

		What: /sys/bus/coresight/devices/<cti-name>/label
		Date: Aug 2025
		KernelVersion 6.18
		Contact: Mao Jinlong <quic_jinlmao@quicinc.com>
		Description: (Read) Show hardware context information of device.

Documentation/ABI/testing/sysfs-bus-coresight-devices-dummy-source

+6 −0

Original line number	Diff line number	Diff line
		@@ -13,3 +13,9 @@ KernelVersion: 6.14
		Contact: Mao Jinlong <quic_jinlmao@quicinc.com>
		Description: (R) Show the trace ID that will appear in the trace stream
		coming from this trace entity.

		What: /sys/bus/coresight/devices/dummy_source<N>/label
		Date: Aug 2025
		KernelVersion 6.18
		Contact: Mao Jinlong <quic_jinlmao@quicinc.com>
		Description: (Read) Show hardware context information of device.

Documentation/ABI/testing/sysfs-bus-coresight-devices-etb10

+6 −0

Original line number	Diff line number	Diff line
		@@ -19,6 +19,12 @@ Description: (RW) Disables write access to the Trace RAM by stopping the
		into the Trace RAM following the trigger event is equal to the
		value stored in this register+1 (from ARM ETB-TRM).

		What: /sys/bus/coresight/devices/<memory_map>.etb/label
		Date: Aug 2025
		KernelVersion 6.18
		Contact: Mao Jinlong <quic_jinlmao@quicinc.com>
		Description: (Read) Show hardware context information of device.

		What: /sys/bus/coresight/devices/<memory_map>.etb/mgmt/rdp
		Date: March 2016
		KernelVersion: 4.7

Documentation/ABI/testing/sysfs-bus-coresight-devices-etm3x

+6 −0

Original line number	Diff line number	Diff line
		@@ -251,6 +251,12 @@ KernelVersion: 4.4
		Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
		Description: (RO) Holds the cpu number this tracer is affined to.

		What: /sys/bus/coresight/devices/<memory_map>.[etm\|ptm]/label
		Date: Aug 2025
		KernelVersion 6.18
		Contact: Mao Jinlong <quic_jinlmao@quicinc.com>
		Description: (Read) Show hardware context information of device.

		What: /sys/bus/coresight/devices/<memory_map>.[etm\|ptm]/mgmt/etmccr
		Date: September 2015
		KernelVersion: 4.4

Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x

+6 −0

Original line number	Diff line number	Diff line
		@@ -329,6 +329,12 @@ Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
		Description: (RW) Access the selected single show PE comparator control
		register.

		What: /sys/bus/coresight/devices/etm<N>/label
		Date: Aug 2025
		KernelVersion 6.18
		Contact: Mao Jinlong <quic_jinlmao@quicinc.com>
		Description: (Read) Show hardware context information of device.

		What: /sys/bus/coresight/devices/etm<N>/mgmt/trcoslsr
		Date: April 2015
		KernelVersion: 4.01