diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 99ef5edb9859c4be4e67b0e054a19426cebca4f4..dbea50a0a45996d79b098bf51e166d40ad00a19f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1828,7 +1828,8 @@ struct drm_i915_file_private {
 #define I915_NEED_GFX_HWS(dev)	(INTEL_INFO(dev)->need_gfx_hws)
 
 #define HAS_HW_CONTEXTS(dev)	(INTEL_INFO(dev)->gen >= 6)
-#define HAS_ALIASING_PPGTT(dev)	(INTEL_INFO(dev)->gen >=6 && !IS_VALLEYVIEW(dev))
+#define HAS_ALIASING_PPGTT(dev)	(INTEL_INFO(dev)->gen >= 6 && !IS_VALLEYVIEW(dev))
+#define USES_ALIASING_PPGTT(dev) intel_enable_ppgtt(dev, false)
 
 #define HAS_OVERLAY(dev)		(INTEL_INFO(dev)->has_overlay)
 #define OVERLAY_NEEDS_PHYSICAL(dev)	(INTEL_INFO(dev)->overlay_needs_physical)
@@ -2272,6 +2273,25 @@ static inline void i915_gem_chipset_flush(struct drm_device *dev)
 	if (INTEL_INFO(dev)->gen < 6)
 		intel_gtt_chipset_flush();
 }
+int i915_gem_init_ppgtt(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt);
+static inline bool intel_enable_ppgtt(struct drm_device *dev, bool full)
+{
+	if (i915_enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
+		return false;
+
+	BUG_ON(full);
+
+#ifdef CONFIG_INTEL_IOMMU
+	/* Disable ppgtt on SNB if VT-d is on. */
+	if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped) {
+		DRM_INFO("Disabling PPGTT because VT-d is on\n");
+		return false;
+	}
+#endif
+
+	return HAS_ALIASING_PPGTT(dev);
+}
+
 
 
 /* i915_gem_evict.c */
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index fdeed684bf5cbe25715e5d7940a2a03bd83befd8..c69fa2c72c1501dfc9acca2c6bf678480fed26a8 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -888,8 +888,7 @@ static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
 	return ret;
 }
 
-static int i915_gem_init_ppgtt(struct drm_device *dev,
-			       struct i915_hw_ppgtt *ppgtt)
+int i915_gem_init_ppgtt(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int ret = 0;
@@ -1397,21 +1396,6 @@ void i915_gem_setup_global_gtt(struct drm_device *dev,
 	ggtt_vm->clear_range(ggtt_vm, end / PAGE_SIZE - 1, 1, true);
 }
 
-static bool
-intel_enable_ppgtt(struct drm_device *dev)
-{
-	if (i915_enable_ppgtt >= 0)
-		return i915_enable_ppgtt;
-
-#ifdef CONFIG_INTEL_IOMMU
-	/* Disable ppgtt on SNB if VT-d is on. */
-	if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped)
-		return false;
-#endif
-
-	return true;
-}
-
 void i915_gem_init_global_gtt(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -1421,7 +1405,7 @@ void i915_gem_init_global_gtt(struct drm_device *dev)
 	mappable_size = dev_priv->gtt.mappable_end;
 
 	i915_gem_setup_global_gtt(dev, 0, mappable_size, gtt_size);
-	if (intel_enable_ppgtt(dev) && HAS_ALIASING_PPGTT(dev)) {
+	if (USES_ALIASING_PPGTT(dev)) {
 		struct i915_hw_ppgtt *ppgtt;
 		int ret;