drm/i915: Add plane update/disable tracepoints

Add tracepoints for plane programming. The tracepoints will dump
the frame and scanline counters, so this can be used to verify eg. that
the plane gets reprogrammed at the right time with respect to watermark
programming (if we have appropriate tracepoints for that as well).

v2: Rebase due to legacy cursor changes

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170302171508.1666-16-ville.syrjala@linux.intel.com

4 files changed, 80 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index e0aa686..675c28d 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -783,6 +783,9 @@ static int __intel_get_crtc_scanline(struct intel_crtc *crtc)
 	enum pipe pipe = crtc->pipe;
 	int position, vtotal;
 
+	if (!crtc->active)
+		return -1;
+
 	vtotal = mode->crtc_vtotal;
 	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 		vtotal /= 2;
diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
index 2dbef31..6cb03bd 100644
--- a/drivers/gpu/drm/i915/i915_trace.h
+++ b/drivers/gpu/drm/i915/i915_trace.h
@@ -14,6 +14,62 @@
 #define TRACE_SYSTEM i915
 #define TRACE_INCLUDE_FILE i915_trace
 
+/* plane updates */
+
+TRACE_EVENT(intel_update_plane,
+	    TP_PROTO(struct drm_plane *plane, struct intel_crtc *crtc),
+	    TP_ARGS(plane, crtc),
+
+	    TP_STRUCT__entry(
+			     __field(enum pipe, pipe)
+			     __field(const char *, name)
+			     __field(u32, frame)
+			     __field(u32, scanline)
+			     __array(int, src, 4)
+			     __array(int, dst, 4)
+			     ),
+
+	    TP_fast_assign(
+			   __entry->pipe = crtc->pipe;
+			   __entry->name = plane->name;
+			   __entry->frame = crtc->base.dev->driver->get_vblank_counter(crtc->base.dev,
+										       crtc->pipe);
+			   __entry->scanline = intel_get_crtc_scanline(crtc);
+			   memcpy(__entry->src, &plane->state->src, sizeof(__entry->src));
+			   memcpy(__entry->dst, &plane->state->dst, sizeof(__entry->dst));
+			   ),
+
+	    TP_printk("pipe %c, plane %s, frame=%u, scanline=%u, " DRM_RECT_FP_FMT " -> " DRM_RECT_FMT,
+		      pipe_name(__entry->pipe), __entry->name,
+		      __entry->frame, __entry->scanline,
+		      DRM_RECT_FP_ARG((const struct drm_rect *)__entry->src),
+		      DRM_RECT_ARG((const struct drm_rect *)__entry->dst))
+);
+
+TRACE_EVENT(intel_disable_plane,
+	    TP_PROTO(struct drm_plane *plane, struct intel_crtc *crtc),
+	    TP_ARGS(plane, crtc),
+
+	    TP_STRUCT__entry(
+			     __field(enum pipe, pipe)
+			     __field(const char *, name)
+			     __field(u32, frame)
+			     __field(u32, scanline)
+			     ),
+
+	    TP_fast_assign(
+			   __entry->pipe = crtc->pipe;
+			   __entry->name = plane->name;
+			   __entry->frame = crtc->base.dev->driver->get_vblank_counter(crtc->base.dev,
+										       crtc->pipe);
+			   __entry->scanline = intel_get_crtc_scanline(crtc);
+			   ),
+
+	    TP_printk("pipe %c, plane %s, frame=%u, scanline=%u",
+		      pipe_name(__entry->pipe), __entry->name,
+		      __entry->frame, __entry->scanline)
+);
+
 /* pipe updates */
 
 TRACE_EVENT(i915_pipe_update_start,
diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c b/drivers/gpu/drm/i915/intel_atomic_plane.c
index 1eaf840..cfb4729 100644
--- a/drivers/gpu/drm/i915/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
@@ -231,12 +231,19 @@ static void intel_plane_atomic_update(struct drm_plane *plane,
 		to_intel_plane_state(plane->state);
 	struct drm_crtc *crtc = plane->state->crtc ?: old_state->crtc;
 
-	if (intel_state->base.visible)
+	if (intel_state->base.visible) {
+		trace_intel_update_plane(plane,
+					 to_intel_crtc(crtc));
+
 		intel_plane->update_plane(plane,
 					  to_intel_crtc_state(crtc->state),
 					  intel_state);
-	else
+	} else {
+		trace_intel_disable_plane(plane,
+					  to_intel_crtc(crtc));
+
 		intel_plane->disable_plane(plane, crtc);
+	}
 }
 
 const struct drm_plane_helper_funcs intel_plane_helper_funcs = {
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 1c22f86..72e2c91 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2754,6 +2754,7 @@ intel_find_initial_plane_obj(struct intel_crtc *intel_crtc,
 				to_intel_plane_state(plane_state),
 				false);
 	intel_pre_disable_primary_noatomic(&intel_crtc->base);
+	trace_intel_disable_plane(primary, intel_crtc);
 	intel_plane->disable_plane(primary, &intel_crtc->base);
 
 	return;
@@ -3447,10 +3448,14 @@ static void intel_update_primary_planes(struct drm_device *dev)
 		struct intel_plane_state *plane_state =
 			to_intel_plane_state(plane->base.state);
 
-		if (plane_state->base.visible)
+		if (plane_state->base.visible) {
+			trace_intel_update_plane(&plane->base,
+						 to_intel_crtc(crtc));
+
 			plane->update_plane(&plane->base,
 					    to_intel_crtc_state(crtc->state),
 					    plane_state);
+		}
 	}
 }
 
@@ -13491,12 +13496,15 @@ intel_legacy_cursor_update(struct drm_plane *plane,
 	new_plane_state->fb = old_fb;
 	to_intel_plane_state(new_plane_state)->vma = old_vma;
 
-	if (plane->state->visible)
+	if (plane->state->visible) {
+		trace_intel_update_plane(plane, to_intel_crtc(crtc));
 		intel_plane->update_plane(plane,
 					  to_intel_crtc_state(crtc->state),
 					  to_intel_plane_state(plane->state));
-	else
+	} else {
+		trace_intel_disable_plane(plane, to_intel_crtc(crtc));
 		intel_plane->disable_plane(plane, crtc);
+	}
 
 	intel_cleanup_plane_fb(plane, new_plane_state);
 
@@ -15145,6 +15153,7 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc)
 			if (plane->base.type == DRM_PLANE_TYPE_PRIMARY)
 				continue;
 
+			trace_intel_disable_plane(&plane->base, crtc);
 			plane->disable_plane(&plane->base, &crtc->base);
 		}
 	}