drm/amd/display: performance profiling instrumentation

Signed-off-by: Tony Cheng <tony.cheng@amd.com>
Reviewed-by: Yongqiang Sun <yongqiang.sun@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dm_services.h

@@ -372,6 +372,13 @@ bool dm_dmcu_set_pipe(struct dc_context *ctx, unsigned int controller_id);
 
 unsigned long long dm_get_timestamp(struct dc_context *ctx);
 
+/*
+ * performance tracing
+ */
+void dm_perf_trace_timestamp(const char *func_name, unsigned int line);
+#define PERF_TRACE()	dm_perf_trace_timestamp(__func__, __LINE__)
+
+
 /*
  * Debug and verification hooks
  */