On Tue, 11 Mar 2025 at 17:05, Leo Yan leo.yan@arm.com wrote:
Introduce APIs for pausing and resuming trace source and export as GPL symbols.
Signed-off-by: Leo Yan leo.yan@arm.com
drivers/hwtracing/coresight/coresight-core.c | 22 ++++++++++++++++++++ drivers/hwtracing/coresight/coresight-priv.h | 2 ++ include/linux/coresight.h | 4 ++++ 3 files changed, 28 insertions(+)
diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c index fb43ef6a3b1f..d4c3000608f2 100644 --- a/drivers/hwtracing/coresight/coresight-core.c +++ b/drivers/hwtracing/coresight/coresight-core.c @@ -367,6 +367,28 @@ 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
diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h index 82644aff8d2b..2d9baa9d8228 100644 --- a/drivers/hwtracing/coresight/coresight-priv.h +++ b/drivers/hwtracing/coresight/coresight-priv.h @@ -249,5 +249,7 @@ 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 diff --git a/include/linux/coresight.h b/include/linux/coresight.h index d79a242b271d..c95c72e07e02 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -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);};
/**
2.34.1
Reviewed-by: Mike Leach mike.leach@linaro.org