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In theory, the options should be arbitrary values and are neutral for any ETM version; so far perf tool uses ETMv3.5/PTM ETMCR config bits except for register's bit definitions, also uses as options. This can introduce confusion, especially if we want to add a new option but the new option is not supported by ETMv3.5/PTM ETMCR. But on the other hand, we cannot change options since these options are generic CoreSight PMU ABI. For easier maintenance and avoid confusion, this patch refines the comment to clarify perf options, and gives out the background info for these bits are coming from ETMv3.5/PTM. Afterwards, we should take these options as general knobs, and if there have any confliction with ETMv3.5/PTM, should consider to define saperate macros for ETMv3.5/PTM ETMCR config bits. Suggested-by: Suzuki K Poulose <suzuki.poulose@arm.com> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Leo Yan <leo.yan@linaro.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20210206150833.42120-2-leo.yan@linaro.org Link: https://lore.kernel.org/r/20210211172038.2483517-2-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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