Re: [PATCH 4/9] drm/i915: Introduce intel_prepare_cursor_plane()

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On 11/24/2014 09:53 PM, Matt Roper wrote:
Primary and sprite planes have already been refactored to include a
'prepare' step which handles all the commit-time operations that could
fail (i.e., pinning buffers and such).  Refactor the cursor commit in a
similar manner.

For simplicity and consistency with other plane types, we also switch to
using intel_pin_and_fence_fb_obj() to perform our pinning for
non-physical cursors.  This will allow us to more easily migrate the
code into the atomic 'begin' handler in a plane-agnostic manner in a
future patchset.

Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
  drivers/gpu/drm/i915/intel_display.c | 114 ++++++++++++++---------------------
  1 file changed, 44 insertions(+), 70 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 17788f8..ff94e43 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11899,19 +11899,51 @@ intel_check_cursor_plane(struct drm_plane *plane,
  }

  static int
+intel_prepare_cursor_plane(struct drm_plane *plane,
+			   struct intel_plane_state *state)
+{
+	struct drm_device *dev = plane->dev;
+	struct drm_framebuffer *fb = state->fb;
+	struct intel_crtc *intel_crtc = to_intel_crtc(state->crtc);
+	struct drm_i915_gem_object *obj = intel_fb_obj(fb);
+	struct drm_i915_gem_object *old_obj = intel_fb_obj(plane->fb);
+	enum pipe pipe = intel_crtc->pipe;
+	int ret = 0;
+
+	if (old_obj != obj) {
+		/* we only need to pin inside GTT if cursor is non-phy */
+		mutex_lock(&dev->struct_mutex);
+		if (!INTEL_INFO(dev)->cursor_needs_physical) {
+			if (obj)
+				ret = intel_pin_and_fence_fb_obj(plane, fb, NULL);
+			if (ret == 0)
+				i915_gem_track_fb(intel_crtc->cursor_bo, obj,
+						  INTEL_FRONTBUFFER_CURSOR(pipe));

Shouldn't the frontbuffer bits be updated in the else case too? At least they were, prior to this patch.

+		} else {
+			int align = IS_I830(dev) ? 16 * 1024 : 256;
+			if (obj)
+				ret = i915_gem_object_attach_phys(obj, align);
+			if (ret)
+				DRM_DEBUG_KMS("failed to attach phys object\n");
+		}
+		mutex_unlock(&dev->struct_mutex);
+	}
+
+	return ret;
+}
+
+static void
  intel_commit_cursor_plane(struct drm_plane *plane,
  			  struct intel_plane_state *state)
  {
  	struct drm_crtc *crtc = state->crtc;
  	struct drm_device *dev = crtc->dev;
-	struct drm_i915_private *dev_priv = dev->dev_private;
  	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
  	struct intel_plane *intel_plane = to_intel_plane(plane);
  	struct drm_i915_gem_object *obj = intel_fb_obj(state->fb);
  	enum pipe pipe = intel_crtc->pipe;
  	unsigned old_width;
  	uint32_t addr;
-	int ret;

  	crtc->cursor_x = state->orig_dst.x1;
  	crtc->cursor_y = state->orig_dst.y1;
@@ -11929,75 +11961,18 @@ intel_commit_cursor_plane(struct drm_plane *plane,
  	if (intel_crtc->cursor_bo == obj)
  		goto update;

-	/* if we want to turn off the cursor ignore width and height */
-	if (!obj) {
-		DRM_DEBUG_KMS("cursor off\n");
+	if (!obj)
  		addr = 0;
-		mutex_lock(&dev->struct_mutex);
-		goto finish;
-	}
-
-	/* we only need to pin inside GTT if cursor is non-phy */
-	mutex_lock(&dev->struct_mutex);
-	if (!INTEL_INFO(dev)->cursor_needs_physical) {
-		unsigned alignment;
-
-		/*
-		 * Global gtt pte registers are special registers which actually
-		 * forward writes to a chunk of system memory. Which means that
-		 * there is no risk that the register values disappear as soon
-		 * as we call intel_runtime_pm_put(), so it is correct to wrap
-		 * only the pin/unpin/fence and not more.
-		 */
-		intel_runtime_pm_get(dev_priv);
-
-		/* Note that the w/a also requires 2 PTE of padding following
-		 * the bo. We currently fill all unused PTE with the shadow
-		 * page and so we should always have valid PTE following the
-		 * cursor preventing the VT-d warning.
-		 */
-		alignment = 0;
-		if (need_vtd_wa(dev))
-			alignment = 64*1024;
-
-		ret = i915_gem_object_pin_to_display_plane(obj, alignment, NULL);
-		if (ret) {
-			DRM_DEBUG_KMS("failed to move cursor bo into the GTT\n");
-			intel_runtime_pm_put(dev_priv);
-			goto fail_locked;
-		}
-
-		ret = i915_gem_object_put_fence(obj);
-		if (ret) {
-			DRM_DEBUG_KMS("failed to release fence for cursor");
-			intel_runtime_pm_put(dev_priv);
-			goto fail_unpin;
-		}
-
+	else if (!INTEL_INFO(dev)->cursor_needs_physical)
  		addr = i915_gem_obj_ggtt_offset(obj);
-
-		intel_runtime_pm_put(dev_priv);
-
-	} else {
-		int align = IS_I830(dev) ? 16 * 1024 : 256;
-		ret = i915_gem_object_attach_phys(obj, align);
-		if (ret) {
-			DRM_DEBUG_KMS("failed to attach phys object\n");
-			goto fail_locked;
-		}
+	else
  		addr = obj->phys_handle->busaddr;
-	}

-finish:
  	if (intel_crtc->cursor_bo) {
  		if (!INTEL_INFO(dev)->cursor_needs_physical)
  			i915_gem_object_unpin_from_display_plane(intel_crtc->cursor_bo);

This is now being called without holding dev->struct_mutex. I don't know if that is necessary or not.


Ander

  	}

-	i915_gem_track_fb(intel_crtc->cursor_bo, obj,
-			  INTEL_FRONTBUFFER_CURSOR(pipe));
-	mutex_unlock(&dev->struct_mutex);
-
  	intel_crtc->cursor_addr = addr;
  	intel_crtc->cursor_bo = obj;
  update:
@@ -12013,13 +11988,6 @@ update:

  		intel_frontbuffer_flip(dev, INTEL_FRONTBUFFER_CURSOR(pipe));
  	}
-
-	return 0;
-fail_unpin:
-	i915_gem_object_unpin_from_display_plane(obj);
-fail_locked:
-	mutex_unlock(&dev->struct_mutex);
-	return ret;
  }

  static int
@@ -12060,7 +12028,13 @@ intel_cursor_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
  	if (ret)
  		return ret;

-	return intel_commit_cursor_plane(plane, &state);
+	ret = intel_prepare_cursor_plane(plane, &state);
+	if (ret)
+		return ret;
+
+	intel_commit_cursor_plane(plane, &state);
+
+	return 0;
  }

  static const struct drm_plane_funcs intel_cursor_plane_funcs = {


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