coresight: etm-perf: Add support for ETR backend

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Add support for using TMC-ETR as backend for ETM perf tracing.
We use software double buffering at the moment. i.e, the TMC-ETR
uses a separate buffer than the perf ring buffer. The data is
copied to the perf ring buffer once a session completes.

The TMC-ETR would try to match the larger of perf ring buffer
or the ETR buffer size configured via sysfs, scaling down to
a minimum limit of 1MB.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Suzuki K Poulose 2018-09-20 13:17:57 -06:00 • committed by Greg Kroah-Hartman

parent 3d6e893575

commit 22f429f19c

2 changed files with 248 additions and 2 deletions

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248

drivers/hwtracing/coresight/coresight-tmc-etr.c

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2

drivers/hwtracing/coresight/coresight-tmc.h

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