coresight: etm: perf: Add default sink selection to etm perf
Add default sink selection to the perf trace handling in the etm driver. Uses the select default sink infrastructure to select a sink for the perf session, if no other sink is specified. Signed-off-by: Mike Leach <mike.leach@linaro.org> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-17-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -226,9 +226,6 @@ static void *etm_setup_aux(struct perf_event *event, void **pages,
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sink = coresight_get_enabled_sink(true);
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}
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if (!sink)
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goto err;
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mask = &event_data->mask;
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/*
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@ -253,6 +250,16 @@ static void *etm_setup_aux(struct perf_event *event, void **pages,
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continue;
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}
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/*
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* No sink provided - look for a default sink for one of the
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* devices. At present we only support topology where all CPUs
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* use the same sink [N:1], so only need to find one sink. The
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* coresight_build_path later will remove any CPU that does not
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* attach to the sink, or if we have not found a sink.
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*/
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if (!sink)
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sink = coresight_find_default_sink(csdev);
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/*
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* Building a path doesn't enable it, it simply builds a
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* list of devices from source to sink that can be
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@ -267,6 +274,10 @@ static void *etm_setup_aux(struct perf_event *event, void **pages,
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*etm_event_cpu_path_ptr(event_data, cpu) = path;
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}
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/* no sink found for any CPU - cannot trace */
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if (!sink)
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goto err;
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/* If we don't have any CPUs ready for tracing, abort */
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cpu = cpumask_first(mask);
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if (cpu >= nr_cpu_ids)
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