greybus: tracing: define bundle traces

Define a new gb_bundle trace point event class, used to trace events
associated with the bundle abstraction.  Define four basic trace
points for this--creation time, drop of last reference, before
adding it to its interface and when removed when its interface
is destroyed.
Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/bundle.c

@@ -8,6 +8,7 @@
  */
 
 #include "greybus.h"
+#include "greybus_trace.h"
 
 static ssize_t bundle_class_show(struct device *dev,
 				 struct device_attribute *attr, char *buf)
@@ -82,6 +83,8 @@ static void gb_bundle_release(struct device *dev)
 {
 	struct gb_bundle *bundle = to_gb_bundle(dev);
 
+	trace_gb_bundle_release(bundle);
+
 	kfree(bundle->state);
 	kfree(bundle->cport_desc);
 	kfree(bundle);
@@ -136,6 +139,8 @@ struct gb_bundle *gb_bundle_create(struct gb_interface *intf, u8 bundle_id,
 
 	list_add(&bundle->links, &intf->bundles);
 
+	trace_gb_bundle_create(bundle);
+
 	return bundle;
 }
 
@@ -149,6 +154,8 @@ int gb_bundle_add(struct gb_bundle *bundle)
 		return ret;
 	}
 
+	trace_gb_bundle_add(bundle);
+
 	return 0;
 }
 
@@ -157,6 +164,8 @@ int gb_bundle_add(struct gb_bundle *bundle)
  */
 void gb_bundle_destroy(struct gb_bundle *bundle)
 {
+	trace_gb_bundle_destroy(bundle);
+
 	if (device_is_registered(&bundle->dev))
 		device_del(&bundle->dev);
 

drivers/staging/greybus/greybus_trace.h

@@ -16,6 +16,7 @@
 
 struct gb_message;
 struct gb_operation;
+struct gb_bundle;
 struct gb_host_device;
 
 #define gb_bundle_name(message)						\
@@ -161,6 +162,61 @@ DEFINE_OPERATION_EVENT(gb_operation_put_active);
 
 #undef DEFINE_OPERATION_EVENT
 
+DECLARE_EVENT_CLASS(gb_bundle,
+
+	TP_PROTO(struct gb_bundle *bundle),
+
+	TP_ARGS(bundle),
+
+	TP_STRUCT__entry(
+		__field(u8, intf_id)
+		__field(u8, id)
+		__field(u8, class)
+		__field(size_t, num_cports)
+	),
+
+	TP_fast_assign(
+		__entry->intf_id = bundle->intf->interface_id;
+		__entry->id = bundle->id;
+		__entry->class = bundle->class;
+		__entry->num_cports = bundle->num_cports;
+	),
+
+	TP_printk("intf_id=0x%02x id=%02x class=0x%02x num_cports=%zu",
+		  __entry->intf_id, __entry->id, __entry->class,
+		  __entry->num_cports)
+);
+
+#define DEFINE_BUNDLE_EVENT(name)					\
+		DEFINE_EVENT(gb_bundle, name,			\
+				TP_PROTO(struct gb_bundle *bundle), \
+				TP_ARGS(bundle))
+
+/*
+ * Occurs after a new bundle is successfully created.
+ */
+DEFINE_BUNDLE_EVENT(gb_bundle_create);
+
+/*
+ * Occurs when the last reference to a bundle has been dropped,
+ * before its resources are freed.
+ */
+DEFINE_BUNDLE_EVENT(gb_bundle_release);
+
+/*
+ * Occurs when a bundle is added to an interface when the interface
+ * is enabled.
+ */
+DEFINE_BUNDLE_EVENT(gb_bundle_add);
+
+/*
+ * Occurs when a registered bundle gets destroyed, normally at the
+ * time an interface is disabled.
+ */
+DEFINE_BUNDLE_EVENT(gb_bundle_destroy);
+
+#undef DEFINE_BUNDLE_EVENT
+
 DECLARE_EVENT_CLASS(gb_interface,
 
 	TP_PROTO(struct gb_interface *intf),