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coresight: etm4x: Expose trcdevarch via sysfs

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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>
This commit is contained in:
Suzuki K Poulose 2021-02-01 11:13:42 -07:00 committed by Greg Kroah-Hartman
parent 8b94db1eda
commit 4211bfce1e
2 changed files with 9 additions and 0 deletions
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8
Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
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@ -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

1
drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
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@ -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,
};