Commit 5fa96c83 authored by Leo Yan's avatar Leo Yan Committed by Suzuki K Poulose
Browse files

coresight: Introduce pause and resume APIs for source 



Introduce APIs for pausing and resuming trace source and export as GPL
symbols.

Signed-off-by: default avatarLeo Yan <leo.yan@arm.com>
Reviewed-by: default avatarMike Leach <mike.leach@linaro.org>
Reviewed-by: default avatarJames Clark <james.clark@linaro.org>
Signed-off-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250401180708.385396-3-leo.yan@arm.com
parent 40f682ae

drivers/hwtracing/coresight/coresight-core.c

+22 −0
Original line number Diff line number Diff line
@@ -392,6 +392,28 @@ void coresight_disable_source(struct coresight_device *csdev, void *data) 
}

EXPORT_SYMBOL_GPL(coresight_disable_source);



void coresight_pause_source(struct coresight_device *csdev)

{

	if (!coresight_is_percpu_source(csdev))

		return;



	if (source_ops(csdev)->pause_perf)

		source_ops(csdev)->pause_perf(csdev);

}

EXPORT_SYMBOL_GPL(coresight_pause_source);



int coresight_resume_source(struct coresight_device *csdev)

{

	if (!coresight_is_percpu_source(csdev))

		return -EOPNOTSUPP;



	if (!source_ops(csdev)->resume_perf)

		return -EOPNOTSUPP;



	return source_ops(csdev)->resume_perf(csdev);

}

EXPORT_SYMBOL_GPL(coresight_resume_source);



/*

 * coresight_disable_path_from : Disable components in the given path beyond

 * @nd in the list. If @nd is NULL, all the components, except the SOURCE are

drivers/hwtracing/coresight/coresight-priv.h

+2 −0
Original line number Diff line number Diff line
@@ -251,5 +251,7 @@ void coresight_add_helper(struct coresight_device *csdev, 
void coresight_set_percpu_sink(int cpu, struct coresight_device *csdev);

struct coresight_device *coresight_get_percpu_sink(int cpu);

void coresight_disable_source(struct coresight_device *csdev, void *data);

void coresight_pause_source(struct coresight_device *csdev);

int coresight_resume_source(struct coresight_device *csdev);



#endif

include/linux/coresight.h

+4 −0
Original line number Diff line number Diff line
@@ -398,6 +398,8 @@ struct coresight_ops_link { 
 *		is associated to.

 * @enable:	enables tracing for a source.

 * @disable:	disables tracing for a source.

 * @resume_perf: resumes tracing for a source in perf session.

 * @pause_perf:	pauses tracing for a source in perf session.

 */

struct coresight_ops_source {

	int (*cpu_id)(struct coresight_device *csdev);
@@ -405,6 +407,8 @@ struct coresight_ops_source { 
		      enum cs_mode mode, struct coresight_path *path);

	void (*disable)(struct coresight_device *csdev,

			struct perf_event *event);

	int (*resume_perf)(struct coresight_device *csdev);

	void (*pause_perf)(struct coresight_device *csdev);

};



/**