diff options
author | Mathieu Poirier <mathieu.poirier@linaro.org> | 2019-02-05 16:24:58 -0700 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-08 12:27:36 +0100 |
commit | b5390f4b5e0b75634c7f08c88e97b5fe0e833599 (patch) | |
tree | f3b616f8a999bcb187b48bd7f25379df492775a0 /drivers/hwtracing/coresight/coresight-etm-perf.c | |
parent | 988036f9d322cbd787d8f6a776dbe903d05bae22 (diff) |
coresight: Use event attributes for sink selection
This patch uses the information conveyed by perf_event::attr::config2
to select a sink to use for the session. That way a sink can easily be
selected to be used by more than one source, something that isn't currently
possible with the sysfs implementation.
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-etm-perf.c')
-rw-r--r-- | drivers/hwtracing/coresight/coresight-etm-perf.c | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c index cdbdb28dc175..8c88bf0a1e5f 100644 --- a/drivers/hwtracing/coresight/coresight-etm-perf.c +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c @@ -31,11 +31,14 @@ static DEFINE_PER_CPU(struct coresight_device *, csdev_src); PMU_FORMAT_ATTR(cycacc, "config:" __stringify(ETM_OPT_CYCACC)); PMU_FORMAT_ATTR(timestamp, "config:" __stringify(ETM_OPT_TS)); PMU_FORMAT_ATTR(retstack, "config:" __stringify(ETM_OPT_RETSTK)); +/* Sink ID - same for all ETMs */ +PMU_FORMAT_ATTR(sinkid, "config2:0-31"); static struct attribute *etm_config_formats_attr[] = { &format_attr_cycacc.attr, &format_attr_timestamp.attr, &format_attr_retstack.attr, + &format_attr_sinkid.attr, NULL, }; @@ -191,6 +194,7 @@ static void etm_free_aux(void *data) static void *etm_setup_aux(struct perf_event *event, void **pages, int nr_pages, bool overwrite) { + u32 id; int cpu = event->cpu; cpumask_t *mask; struct coresight_device *sink; @@ -201,18 +205,14 @@ static void *etm_setup_aux(struct perf_event *event, void **pages, return NULL; INIT_WORK(&event_data->work, free_event_data); - /* - * In theory nothing prevent tracers in a trace session from being - * associated with different sinks, nor having a sink per tracer. But - * until we have HW with this kind of topology we need to assume tracers - * in a trace session are using the same sink. Therefore go through - * the coresight bus and pick the first enabled sink. - * - * When operated from sysFS users are responsible to enable the sink - * while from perf, the perf tools will do it based on the choice made - * on the cmd line. As such the "enable_sink" flag in sysFS is reset. - */ - sink = coresight_get_enabled_sink(true); + /* First get the selected sink from user space. */ + if (event->attr.config2) { + id = (u32)event->attr.config2; + sink = coresight_get_sink_by_id(id); + } else { + sink = coresight_get_enabled_sink(true); + } + if (!sink || !sink_ops(sink)->alloc_buffer) goto err; |