On Tue, 11 Mar 2025 at 17:05, Leo Yan <leo.yan@xxxxxxx> wrote:
>
> Introduce APIs for pausing and resuming trace source and export as GPL
> symbols.
>
> Signed-off-by: Leo Yan <leo.yan@xxxxxxx>
> ---
> 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@xxxxxxxxxx>
--
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK
