coresight-etm3x: Support context-ID tracing when PID namespace is enabled

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The Coresight ETM drivers already support context-ID tracing, but it won't
work when PID namespace is enabled. This is because when using PID
namespace a process id (ie. VPID) seen from the current namespace differs
from the id (ie. PID) seen by kernel.

So when users write the process id seen by themselves to ETM, there needs
to be a translation from VPID to PID, as such ETM drivers will write the
PID into the Context ID register correctly.

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Chunyan Zhang 2015-07-31 09:37:27 -06:00 • committed by Greg Kroah-Hartman

parent 722102274a

commit a440617e0d

2 changed files with 14 additions and 5 deletions

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3

drivers/hwtracing/coresight/coresight-etm.h

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16

drivers/hwtracing/coresight/coresight-etm3x.c

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