staging: sync: Refactor sync debug printing

Move driver callbacks to fill strings instead of using seq_files.  This
will allow those values to be used in a future tracepoint patch.

Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Cc: Erik Gilling <konkers@android.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Rob Clark <robclark@gmail.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: dri-devel@lists.freedesktop.org
Cc: Android Kernel Team <kernel-team@android.com>
Signed-off-by: Erik Gilling <konkers@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/sync.c

@@ -847,7 +847,17 @@ static void sync_print_pt(struct seq_file *s, struct sync_pt *pt, bool fence)
 		seq_printf(s, "@%ld.%06ld", tv.tv_sec, tv.tv_usec);
 	}
 
-	if (pt->parent->ops->print_pt) {
+	if (pt->parent->ops->timeline_value_str &&
+	    pt->parent->ops->pt_value_str) {
+		char value[64];
+		pt->parent->ops->pt_value_str(pt, value, sizeof(value));
+		seq_printf(s, ": %s", value);
+		if (fence) {
+			pt->parent->ops->timeline_value_str(pt->parent, value,
+						    sizeof(value));
+			seq_printf(s, " / %s", value);
+		}
+	} else if (pt->parent->ops->print_pt) {
 		seq_printf(s, ": ");
 		pt->parent->ops->print_pt(s, pt);
 	}
@@ -862,7 +872,11 @@ static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
 
 	seq_printf(s, "%s %s", obj->name, obj->ops->driver_name);
 
-	if (obj->ops->print_obj) {
+	if (obj->ops->timeline_value_str) {
+		char value[64];
+		obj->ops->timeline_value_str(obj, value, sizeof(value));
+		seq_printf(s, ": %s", value);
+	} else if (obj->ops->print_obj) {
 		seq_printf(s, ": ");
 		obj->ops->print_obj(s, obj);
 	}

drivers/staging/android/sync.h

@@ -40,14 +40,14 @@ struct sync_fence;
  *			 -1 if a will signabl before b
  * @free_pt:		called before sync_pt is freed
  * @release_obj:	called before sync_timeline is freed
- * @print_obj:		print aditional debug information about sync_timeline.
- *			  should not print a newline
- * @print_pt:		print aditional debug information about sync_pt.
- *			  should not print a newline
+ * @print_obj:		deprecated
+ * @print_pt:		deprecated
  * @fill_driver_data:	write implmentation specific driver data to data.
  *			  should return an error if there is not enough room
  *			  as specified by size.  This information is returned
  *			  to userspace by SYNC_IOC_FENCE_INFO.
+ * @timeline_value_str: fill str with the value of the sync_timeline's counter
+ * @pt_value_str:	fill str with the value of the sync_pt
  */
 struct sync_timeline_ops {
 	const char *driver_name;
@@ -67,15 +67,22 @@ struct sync_timeline_ops {
 	/* optional */
 	void (*release_obj)(struct sync_timeline *sync_timeline);
 
-	/* optional */
+	/* deprecated */
 	void (*print_obj)(struct seq_file *s,
 			  struct sync_timeline *sync_timeline);
 
-	/* optional */
+	/* deprecated */
 	void (*print_pt)(struct seq_file *s, struct sync_pt *sync_pt);
 
 	/* optional */
 	int (*fill_driver_data)(struct sync_pt *syncpt, void *data, int size);
+
+	/* optional */
+	void (*timeline_value_str)(struct sync_timeline *timeline, char *str,
+				   int size);
+
+	/* optional */
+	void (*pt_value_str)(struct sync_pt *pt, char *str, int size);
 };
 
 /**