2 files changed, 30 insertions, 2 deletions
diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index 0062c8935653..55c645616bf6 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -23,6 +23,7 @@
 #include "coresight-priv.h"
 
 static DEFINE_MUTEX(coresight_mutex);
+DEFINE_PER_CPU(struct coresight_device *, csdev_sink);
 
 /**
  * struct coresight_node - elements of a path, from source to sink
@@ -70,6 +71,18 @@ void coresight_remove_cti_ops(void)
 }
 EXPORT_SYMBOL_GPL(coresight_remove_cti_ops);
 
+void coresight_set_percpu_sink(int cpu, struct coresight_device *csdev)
+{
+	per_cpu(csdev_sink, cpu) = csdev;
+}
+EXPORT_SYMBOL_GPL(coresight_set_percpu_sink);
+
+struct coresight_device *coresight_get_percpu_sink(int cpu)
+{
+	return per_cpu(csdev_sink, cpu);
+}
+EXPORT_SYMBOL_GPL(coresight_get_percpu_sink);
+
 static int coresight_id_match(struct device *dev, void *data)
 {
 	int trace_id, i_trace_id;
@@ -784,6 +797,14 @@ static int _coresight_build_path(struct coresight_device *csdev,
 	if (csdev == sink)
 		goto out;
 
+	if (coresight_is_percpu_source(csdev) && coresight_is_percpu_sink(sink) &&
+	    sink == per_cpu(csdev_sink, source_ops(csdev)->cpu_id(csdev))) {
+		if (_coresight_build_path(sink, sink, path) == 0) {
+			found = true;
+			goto out;
+		}
+	}
+
 	/* Not a sink - recursively explore each port found on this element */
 	for (i = 0; i < csdev->pdata->nr_outport; i++) {
 		struct coresight_device *child_dev;
@@ -999,8 +1020,12 @@ coresight_find_default_sink(struct coresight_device *csdev)
 	int depth = 0;
 
 	/* look for a default sink if we have not found for this device */
-	if (!csdev->def_sink)
-		csdev->def_sink = coresight_find_sink(csdev, &depth);
+	if (!csdev->def_sink) {
+		if (coresight_is_percpu_source(csdev))
+			csdev->def_sink = per_cpu(csdev_sink, source_ops(csdev)->cpu_id(csdev));
+		if (!csdev->def_sink)
+			csdev->def_sink = coresight_find_sink(csdev, &depth);
+	}
 	return csdev->def_sink;
 }
 
diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index f5f654ea2994..ff1dd2092ac5 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -232,4 +232,7 @@ coresight_find_csdev_by_fwnode(struct fwnode_handle *r_fwnode);
 void coresight_set_assoc_ectdev_mutex(struct coresight_device *csdev,
 				      struct coresight_device *ect_csdev);
 
+void coresight_set_percpu_sink(int cpu, struct coresight_device *csdev);
+struct coresight_device *coresight_get_percpu_sink(int cpu);
+
 #endif