[PATCH 4/6] trim-mutex-lock

[Chris Wilson]

---
 drivers/gpu/drm/i915/intel_display.c | 69 ++++++++++++++++--------------------
 1 file changed, 30 insertions(+), 39 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 9398c1dec473..459223cc667f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12785,14 +12785,7 @@ static int intel_atomic_prepare_commit(struct drm_device *dev,
 			flush_workqueue(dev_priv->wq);
 	}
 
-	ret = mutex_lock_interruptible(&dev->struct_mutex);
-	if (ret)
-		return ret;
-
-	ret = drm_atomic_helper_prepare_planes(dev, &state->base);
-	mutex_unlock(&dev->struct_mutex);
-
-	return ret;
+	return drm_atomic_helper_prepare_planes(dev, &state->base);
 }
 
 u32 intel_crtc_get_vblank_counter(struct intel_crtc *crtc)
@@ -13190,9 +13183,7 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
 	if (intel_state->modeset)
 		intel_display_power_put(dev_priv, POWER_DOMAIN_MODESET);
 
-	mutex_lock(&dev->struct_mutex);
 	drm_atomic_helper_cleanup_planes(dev, state);
-	mutex_unlock(&dev->struct_mutex);
 
 	drm_atomic_helper_commit_cleanup_done(state);
 
@@ -13333,32 +13324,6 @@ intel_prepare_plane_fb(struct drm_plane *plane,
 	struct drm_i915_gem_object *old_obj = intel_fb_obj(plane->state->fb);
 	int ret;
 
-	if (obj) {
-		if (plane->type == DRM_PLANE_TYPE_CURSOR &&
-		    INTEL_INFO(dev_priv)->cursor_needs_physical) {
-			const int align = intel_cursor_alignment(dev_priv);
-
-			ret = i915_gem_object_attach_phys(obj, align);
-			if (ret) {
-				DRM_DEBUG_KMS("failed to attach phys object\n");
-				return ret;
-			}
-		} else {
-			struct i915_vma *vma;
-
-			vma = intel_pin_and_fence_fb_obj(fb, new_state->rotation);
-			if (IS_ERR(vma)) {
-				DRM_DEBUG_KMS("failed to pin object\n");
-				return PTR_ERR(vma);
-			}
-
-			to_intel_plane_state(new_state)->vma = vma;
-		}
-	}
-
-	if (!obj && !old_obj)
-		return 0;
-
 	if (old_obj) {
 		struct drm_crtc_state *crtc_state =
 			drm_atomic_get_existing_crtc_state(new_state->state,
@@ -13397,6 +13362,31 @@ intel_prepare_plane_fb(struct drm_plane *plane,
 	if (!obj)
 		return 0;
 
+	ret = mutex_lock_interruptible(&dev_priv->drm.struct_mutex);
+	if (ret)
+		return ret;
+
+	i915_gem_object_wait_priority(obj, 0, I915_PRIORITY_DISPLAY);
+
+	if (plane->type == DRM_PLANE_TYPE_CURSOR &&
+	    INTEL_INFO(dev_priv)->cursor_needs_physical) {
+		const int align = intel_cursor_alignment(dev_priv);
+
+		ret = i915_gem_object_attach_phys(obj, align);
+	} else {
+		struct i915_vma *vma;
+
+		vma = intel_pin_and_fence_fb_obj(fb, new_state->rotation);
+		if (!IS_ERR(vma))
+			to_intel_plane_state(new_state)->vma = vma;
+		else
+			ret =  PTR_ERR(vma);
+	}
+
+	mutex_unlock(&dev_priv->drm.struct_mutex);
+	if (ret)
+		return ret;
+
 	if (!new_state->fence) { /* implicit fencing */
 		ret = i915_sw_fence_await_reservation(&intel_state->commit_ready,
 						      obj->resv, NULL,
@@ -13404,8 +13394,6 @@ intel_prepare_plane_fb(struct drm_plane *plane,
 						      GFP_KERNEL);
 		if (ret < 0)
 			return ret;
-
-		i915_gem_object_wait_priority(obj, 0, I915_PRIORITY_DISPLAY);
 	}
 
 	return 0;
@@ -13428,8 +13416,11 @@ intel_cleanup_plane_fb(struct drm_plane *plane,
 
 	/* Should only be called after a successful intel_prepare_plane_fb()! */
 	vma = fetch_and_zero(&to_intel_plane_state(old_state)->vma);
-	if (vma)
+	if (vma) {
+		mutex_lock(&plane->dev->struct_mutex);
 		intel_unpin_fb_vma(vma);
+		mutex_unlock(&plane->dev->struct_mutex);
+	}
 }
 
 int
-- 
2.11.0