linux-kernel - [PATCH v2 2/8] coresight: Introduce pause and resume APIs for source

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Message-Id: <20250310104919.58816-3-leo.yan@arm.com>
Date: Mon, 10 Mar 2025 10:49:13 +0000
From: Leo Yan <leo.yan@....com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
	Mike Leach <mike.leach@...aro.org>,
	James Clark <james.clark@...aro.org>,
	Jonathan Corbet <corbet@....net>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	coresight@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Leo Yan <leo.yan@....com>
Subject: [PATCH v2 2/8] coresight: Introduce pause and resume APIs for source

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

Signed-off-by: Leo Yan <leo.yan@....com>
---
 drivers/hwtracing/coresight/coresight-core.c | 20 ++++++++++++++++++++
 drivers/hwtracing/coresight/coresight-priv.h |  2 ++
 include/linux/coresight.h                    |  4 ++++
 3 files changed, 26 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index 0a9380350fb5..eb7b83a7bfa2 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -365,6 +365,26 @@ 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 (!csdev || !coresight_is_percpu_source(csdev))
+		return;
+
+	if (source_ops(csdev)->pause)
+		source_ops(csdev)->pause(csdev);
+}
+EXPORT_SYMBOL_GPL(coresight_pause_source);
+
+void coresight_resume_source(struct coresight_device *csdev)
+{
+	if (!csdev || !coresight_is_percpu_source(csdev))
+		return;
+
+	if (source_ops(csdev)->resume)
+		source_ops(csdev)->resume(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 76403530f33e..a9f14c075e91 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -247,5 +247,7 @@ 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);
+void coresight_resume_source(struct coresight_device *csdev);
 
 #endif
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 17276965ff1d..703e1b8dbe22 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -385,6 +385,8 @@ struct coresight_ops_link {
  *		is associated to.
  * @enable:	enables tracing for a source.
  * @disable:	disables tracing for a source.
+ * @resume:	resumes tracing for a source.
+ * @pause:	pauses tracing for a source.
  */
 struct coresight_ops_source {
 	int (*cpu_id)(struct coresight_device *csdev);
@@ -392,6 +394,8 @@ struct coresight_ops_source {
 		      enum cs_mode mode, struct coresight_trace_id_map *id_map);
 	void (*disable)(struct coresight_device *csdev,
 			struct perf_event *event);
+	int (*resume)(struct coresight_device *csdev);
+	void (*pause)(struct coresight_device *csdev);
 };
 
 /**
-- 
2.34.1