drm/i915: Add frontbuffer tracking tracepoints

Add some tracpoints for frontbuffer tracking so we can
try to figure out what's going on.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210414022309.30898-2-ville.syrjala@linux.intel.comAcked-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/intel_frontbuffer.c

@@ -58,6 +58,7 @@
 #include "display/intel_dp.h"
 
 #include "i915_drv.h"
+#include "i915_trace.h"
 #include "intel_display_types.h"
 #include "intel_fbc.h"
 #include "intel_frontbuffer.h"
@@ -87,6 +88,8 @@ static void frontbuffer_flush(struct drm_i915_private *i915,
 	if (!frontbuffer_bits)
 		return;
 
+	trace_intel_frontbuffer_flush(frontbuffer_bits, origin);
+
 	might_sleep();
 	intel_edp_drrs_flush(i915, frontbuffer_bits);
 	intel_psr_flush(i915, frontbuffer_bits, origin);
@@ -173,6 +176,8 @@ void __intel_fb_invalidate(struct intel_frontbuffer *front,
 		spin_unlock(&i915->fb_tracking.lock);
 	}
 
+	trace_intel_frontbuffer_invalidate(frontbuffer_bits, origin);
+
 	might_sleep();
 	intel_psr_invalidate(i915, frontbuffer_bits, origin);
 	intel_edp_drrs_invalidate(i915, frontbuffer_bits);

drivers/gpu/drm/i915/i915_trace.h

@@ -475,6 +475,44 @@ TRACE_EVENT(intel_pipe_update_end,
 		      __entry->scanline)
 );
 
+/* frontbuffer tracking */
+
+TRACE_EVENT(intel_frontbuffer_invalidate,
+	    TP_PROTO(unsigned int frontbuffer_bits, unsigned int origin),
+	    TP_ARGS(frontbuffer_bits, origin),
+
+	    TP_STRUCT__entry(
+			     __field(unsigned int, frontbuffer_bits)
+			     __field(unsigned int, origin)
+			     ),
+
+	    TP_fast_assign(
+			   __entry->frontbuffer_bits = frontbuffer_bits;
+			   __entry->origin = origin;
+			   ),
+
+	    TP_printk("frontbuffer_bits=0x%08x, origin=%u",
+		      __entry->frontbuffer_bits, __entry->origin)
+);
+
+TRACE_EVENT(intel_frontbuffer_flush,
+	    TP_PROTO(unsigned int frontbuffer_bits, unsigned int origin),
+	    TP_ARGS(frontbuffer_bits, origin),
+
+	    TP_STRUCT__entry(
+			     __field(unsigned int, frontbuffer_bits)
+			     __field(unsigned int, origin)
+			     ),
+
+	    TP_fast_assign(
+			   __entry->frontbuffer_bits = frontbuffer_bits;
+			   __entry->origin = origin;
+			   ),
+
+	    TP_printk("frontbuffer_bits=0x%08x, origin=%u",
+		      __entry->frontbuffer_bits, __entry->origin)
+);
+
 /* object tracking */
 
 TRACE_EVENT(i915_gem_object_create,