Commit 4211bfce authored Feb 01, 2021 by Suzuki K Poulose Committed by Greg Kroah-Hartman Feb 04, 2021

coresight: etm4x: Expose trcdevarch via sysfs

Expose the TRCDEVARCH register via the sysfs for component
detection. Given that the TRCIDR1 may not completely identify
the ETM component and instead need to use TRCDEVARCH, expose
this via sysfs for tools to use it for identification.

Link: https://lore.kernel.org/r/20210110224850.1880240-21-suzuki.poulose@arm.com

Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20210201181351.1475223-23-mathieu.poirier@linaro.org

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 8b94db1e

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

+8 −0

Original line number	Diff line number	Diff line
		@@ -371,6 +371,14 @@ Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
		Description: (Read) Print the content of the Device ID Register
		(0xFC8). The value is taken directly from the HW.

		What: /sys/bus/coresight/devices/etm<N>/mgmt/trcdevarch
		Date: January 2021
		KernelVersion: 5.12
		Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
		Description: (Read) Print the content of the Device Architecture Register
		(offset 0xFBC). The value is taken directly read
		from the HW.

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

drivers/hwtracing/coresight/coresight-etm4x-sysfs.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -2442,6 +2442,7 @@ static struct attribute *coresight_etmv4_mgmt_attrs[] = {
		coresight_etm4x_reg(trcoslsr, TRCOSLSR),
		coresight_etm4x_reg(trcconfig, TRCCONFIGR),
		coresight_etm4x_reg(trctraceid, TRCTRACEIDR),
		coresight_etm4x_reg(trcdevarch, TRCDEVARCH),
		NULL,
		};