coresight tmc etr: Add capabilitiy information
authorSuzuki K Poulose <suzuki.poulose@arm.com>
Wed, 2 Aug 2017 16:22:11 +0000 (10:22 -0600)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 28 Aug 2017 14:05:49 +0000 (16:05 +0200)
commit2884132ae8e4424c2d025deef48d937337e97db7
tree54791dafd8199d7eabcda60b4fd8fd3fca8d0cb2
parent99ac6f120986430993285e3e3f8ecf590d04ba2c
coresight tmc etr: Add capabilitiy information

With new version of TMC ETR, there are differing set of
features supported by the TMC. Add the capability of a
given TMC ETR for making safer decisions at runtime.

The device configuration register of the TMC (DEVID) lists
some of the capabilities. So, we can detect some of them at
probe. However, some of the features (or changes in behavior)
are not advertised and we have to depend on the PID to infer
the features. So we use a static description of the "unadvertised"
capabilities attached to the PID. Combining both, the static
and the dynamic capabilities, we maintain a bitmask of the
available features which can be later checked to take
appropriate actions.

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>
drivers/hwtracing/coresight/coresight-tmc.c
drivers/hwtracing/coresight/coresight-tmc.h