[PATCH v1 05/11] coresight: Save activated path into source device

[Leo Yan]

For a source device, save activated path into the coresight_device
structure.

This will be used by sequential changes for controlling the path during
CPU idle.

Signed-off-by: Leo Yan <leo.yan at arm.com>
---
 drivers/hwtracing/coresight/coresight-core.c | 10 ++++++++++
 include/linux/coresight.h                    |  3 +++
 2 files changed, 13 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index 7ab7321ca8d5..8f565bb3c535 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -495,6 +495,12 @@ static void coresight_disable_path_from(struct coresight_path *path,
 
 void coresight_disable_path(struct coresight_path *path)
 {
+	struct coresight_device *source;
+
+	source = coresight_get_source(path);
+	if (coresight_is_percpu_source(source))
+		source->path = NULL;
+
 	coresight_disable_path_from(path, NULL);
 }
 EXPORT_SYMBOL_GPL(coresight_disable_path);
@@ -577,6 +583,10 @@ int coresight_enable_path(struct coresight_path *path, enum cs_mode mode,
 		}
 	}
 
+	source = coresight_get_source(path);
+	if (coresight_is_percpu_source(source))
+		source->path = path;
+
 out:
 	return ret;
 err_disable_helpers:
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 64cee4040daa..cd9709a36b9c 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -265,6 +265,7 @@ struct coresight_trace_id_map {
  *		CS_MODE_SYSFS. Otherwise it must be accessed from inside the
  *		spinlock.
  * @orphan:	true if the component has connections that haven't been linked.
+ * @path:	activated path pointer (only used for source device).
  * @sysfs_sink_activated: 'true' when a sink has been selected for use via sysfs
  *		by writing a 1 to the 'enable_sink' file.  A sink can be
  *		activated but not yet enabled.  Enabling for a _sink_ happens
@@ -291,6 +292,8 @@ struct coresight_device {
 	local_t	mode;
 	int refcnt;
 	bool orphan;
+	/* activated path (for source only) */
+	struct coresight_path *path;
 	/* sink specific fields */
 	bool sysfs_sink_activated;
 	struct dev_ext_attribute *ea;
-- 
2.34.1