1 files changed, 81 insertions, 9 deletions

diff --git a/drivers/hwtracing/coresight/coresight-sysfs.c b/drivers/hwtracing/coresight/coresight-sysfs.c
index a01c9e54e2ed..d2a6ed8bcc74 100644
--- a/drivers/hwtracing/coresight/coresight-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-sysfs.c
@@ -7,6 +7,7 @@
 #include <linux/device.h>
 #include <linux/idr.h>
 #include <linux/kernel.h>
+#include <linux/property.h>
 
 #include "coresight-priv.h"
 #include "coresight-trace-id.h"
@@ -22,7 +23,7 @@ static DEFINE_IDR(path_idr);
  * When operating Coresight drivers from the sysFS interface, only a single
  * path can exist from a tracer (associated to a CPU) to a sink.
  */
-static DEFINE_PER_CPU(struct list_head *, tracer_path);
+static DEFINE_PER_CPU(struct coresight_path *, tracer_path);
 
 ssize_t coresight_simple_show_pair(struct device *_dev,
 			      struct device_attribute *attr, char *buf)
@@ -53,7 +54,8 @@ ssize_t coresight_simple_show32(struct device *_dev,
 EXPORT_SYMBOL_GPL(coresight_simple_show32);
 
 static int coresight_enable_source_sysfs(struct coresight_device *csdev,
-					 enum cs_mode mode, void *data)
+					 enum cs_mode mode,
+					 struct coresight_path *path)
 {
 	int ret;
 
@@ -64,7 +66,7 @@ static int coresight_enable_source_sysfs(struct coresight_device *csdev,
 	 */
 	lockdep_assert_held(&coresight_mutex);
 	if (coresight_get_mode(csdev) != CS_MODE_SYSFS) {
-		ret = source_ops(csdev)->enable(csdev, data, mode, NULL);
+		ret = source_ops(csdev)->enable(csdev, NULL, mode, path);
 		if (ret)
 			return ret;
 	}
@@ -167,7 +169,7 @@ int coresight_enable_sysfs(struct coresight_device *csdev)
 {
 	int cpu, ret = 0;
 	struct coresight_device *sink;
-	struct list_head *path;
+	struct coresight_path *path;
 	enum coresight_dev_subtype_source subtype;
 	u32 hash;
 
@@ -209,11 +211,15 @@ int coresight_enable_sysfs(struct coresight_device *csdev)
 		goto out;
 	}
 
-	ret = coresight_enable_path(path, CS_MODE_SYSFS, NULL);
+	coresight_path_assign_trace_id(path, CS_MODE_SYSFS);
+	if (!IS_VALID_CS_TRACE_ID(path->trace_id))
+		goto err_path;
+
+	ret = coresight_enable_path(path, CS_MODE_SYSFS);
 	if (ret)
 		goto err_path;
 
-	ret = coresight_enable_source_sysfs(csdev, CS_MODE_SYSFS, NULL);
+	ret = coresight_enable_source_sysfs(csdev, CS_MODE_SYSFS, path);
 	if (ret)
 		goto err_source;
 
@@ -262,7 +268,7 @@ EXPORT_SYMBOL_GPL(coresight_enable_sysfs);
 void coresight_disable_sysfs(struct coresight_device *csdev)
 {
 	int cpu, ret;
-	struct list_head *path = NULL;
+	struct coresight_path *path = NULL;
 	u32 hash;
 
 	mutex_lock(&coresight_mutex);
@@ -366,17 +372,81 @@ static ssize_t enable_source_store(struct device *dev,
 }
 static DEVICE_ATTR_RW(enable_source);
 
+static ssize_t label_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+
+	const char *str;
+	int ret;
+
+	ret = fwnode_property_read_string(dev_fwnode(dev), "label", &str);
+	if (ret == 0)
+		return sysfs_emit(buf, "%s\n", str);
+	else
+		return ret;
+}
+static DEVICE_ATTR_RO(label);
+
+static umode_t label_is_visible(struct kobject *kobj,
+				   struct attribute *attr, int n)
+{
+	struct device *dev = kobj_to_dev(kobj);
+
+	if (attr == &dev_attr_label.attr) {
+		if (fwnode_property_present(dev_fwnode(dev), "label"))
+			return attr->mode;
+		else
+			return 0;
+	}
+
+	return attr->mode;
+}
+
 static struct attribute *coresight_sink_attrs[] = {
 	&dev_attr_enable_sink.attr,
+	&dev_attr_label.attr,
 	NULL,
 };
-ATTRIBUTE_GROUPS(coresight_sink);
+
+static struct attribute_group coresight_sink_group = {
+	.attrs = coresight_sink_attrs,
+	.is_visible = label_is_visible,
+};
+__ATTRIBUTE_GROUPS(coresight_sink);
 
 static struct attribute *coresight_source_attrs[] = {
 	&dev_attr_enable_source.attr,
+	&dev_attr_label.attr,
+	NULL,
+};
+
+static struct attribute_group coresight_source_group = {
+	.attrs = coresight_source_attrs,
+	.is_visible = label_is_visible,
+};
+__ATTRIBUTE_GROUPS(coresight_source);
+
+static struct attribute *coresight_link_attrs[] = {
+	&dev_attr_label.attr,
 	NULL,
 };
-ATTRIBUTE_GROUPS(coresight_source);
+
+static struct attribute_group coresight_link_group = {
+	.attrs = coresight_link_attrs,
+	.is_visible = label_is_visible,
+};
+__ATTRIBUTE_GROUPS(coresight_link);
+
+static struct attribute *coresight_helper_attrs[] = {
+	&dev_attr_label.attr,
+	NULL,
+};
+
+static struct attribute_group coresight_helper_group = {
+	.attrs = coresight_helper_attrs,
+	.is_visible = label_is_visible,
+};
+__ATTRIBUTE_GROUPS(coresight_helper);
 
 const struct device_type coresight_dev_type[] = {
 	[CORESIGHT_DEV_TYPE_SINK] = {
@@ -385,6 +455,7 @@ const struct device_type coresight_dev_type[] = {
 	},
 	[CORESIGHT_DEV_TYPE_LINK] = {
 		.name = "link",
+		.groups = coresight_link_groups,
 	},
 	[CORESIGHT_DEV_TYPE_LINKSINK] = {
 		.name = "linksink",
@@ -396,6 +467,7 @@ const struct device_type coresight_dev_type[] = {
 	},
 	[CORESIGHT_DEV_TYPE_HELPER] = {
 		.name = "helper",
+		.groups = coresight_helper_groups,
 	}
 };
 /* Ensure the enum matches the names and groups */