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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>
This commit is contained in:
Mike Leach 2020-07-16 11:57:45 -06:00 committed by Greg Kroah-Hartman
parent 24497d387c
commit bbfb8f3e4e
1 changed files with 14 additions and 3 deletions
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17
drivers/hwtracing/coresight/coresight-etm-perf.c
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@ -226,9 +226,6 @@ static void *etm_setup_aux(struct perf_event *event, void **pages,
sink = coresight_get_enabled_sink(true);
}
if (!sink)
goto err;
mask = &event_data->mask;
/*
@ -253,6 +250,16 @@ static void *etm_setup_aux(struct perf_event *event, void **pages,
continue;
}
/*
* No sink provided - look for a default sink for one of the
* devices. At present we only support topology where all CPUs
* use the same sink [N:1], so only need to find one sink. The
* coresight_build_path later will remove any CPU that does not
* attach to the sink, or if we have not found a sink.
*/
if (!sink)
sink = coresight_find_default_sink(csdev);
/*
* Building a path doesn't enable it, it simply builds a
* list of devices from source to sink that can be
@ -267,6 +274,10 @@ static void *etm_setup_aux(struct perf_event *event, void **pages,
*etm_event_cpu_path_ptr(event_data, cpu) = path;
}
/* no sink found for any CPU - cannot trace */
if (!sink)
goto err;
/* If we don't have any CPUs ready for tracing, abort */
cpu = cpumask_first(mask);
if (cpu >= nr_cpu_ids)