Adding an API to deal with runtime PM (and anything else)
that might be required by a tracer before and after it is
to be used by the Perf framework.
Signed-off-by: Mathieu Poirier <mathieu.poir...@linaro.org>
---
drivers/hwtracing/coresight/coresight-etm3x.c | 12 ++++++++++++
include/linux/coresight.h | 5 +++++
2 files changed, 17 insertions(+)
diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c
b/drivers/hwtracing/coresight/coresight-etm3x.c
index f565554744fe..9b4c0359ca29 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -459,6 +459,16 @@ static int etm_trace_id(struct coresight_device *csdev)
return etm_get_trace_id(drvdata);
}
+static int perf_etm_start(struct coresight_device *csdev)
+{
+ return pm_runtime_get_sync(csdev->dev.parent);
+}
+
+static int perf_etm_stop(struct coresight_device *csdev)
+{
+ return pm_runtime_put(csdev->dev.parent);
+}
+
static void *perf_etm_get_config(struct coresight_device *csdev,
struct perf_event *event)
{
@@ -625,6 +635,8 @@ static void sysfs_etm_disable(struct coresight_device
*csdev)
static const struct coresight_ops_source etm_source_ops = {
.cpu_id = etm_cpu_id,
.trace_id = etm_trace_id,
+ .perf_start = perf_etm_start,
+ .perf_stop = perf_etm_stop,
.perf_get_config = perf_etm_get_config,
.perf_set_config = perf_etm_set_config,
.perf_enable = perf_etm_enable,
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index b853d722346b..0601da01eeb2 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -209,6 +209,9 @@ struct coresight_ops_link {
* is associated to.
* @trace_id: returns the value of the component's trace ID as known
to the HW.
+ * @perf_start: operations to be done before a tracer can be
used.
+ * @perf_stop: operations to be done when a tracer is
+ * no longer needed.
* @perf_get_config: builds the ETM configuration after event' specifics.
* @perf_set_config: associate a tracer with a configuration..
* @perf_enable: enables tracing for a source, from Perf.
@@ -219,6 +222,8 @@ struct coresight_ops_link {
struct coresight_ops_source {
int (*cpu_id)(struct coresight_device *csdev);
int (*trace_id)(struct coresight_device *csdev);
+ int (*perf_start)(struct coresight_device *csdev);
+ int (*perf_stop)(struct coresight_device *csdev);
void *(*perf_get_config)(struct coresight_device *csdev,
struct perf_event *event);
void (*perf_set_config)(struct coresight_device *csdev, void *config);
--
1.9.1
--
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