diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 468d2a0..3f70178 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1427,8 +1427,8 @@ static void i915_kick_out_firmware_fb(struct drm_i915_private *dev_priv)
 		return;
 
 	ap->ranges[0].base = dev_priv->gtt.mappable_base;
-	ap->ranges[0].size =
-		dev_priv->mm.gtt->gtt_mappable_entries << PAGE_SHIFT;
+	ap->ranges[0].size = dev_priv->gtt.mappable_end - dev_priv->gtt.start;
+
 	primary =
 		pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
 
@@ -1542,7 +1542,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 		goto put_gmch;
 	}
 
-	aperture_size = dev_priv->mm.gtt->gtt_mappable_entries << PAGE_SHIFT;
+	aperture_size = dev_priv->gtt.mappable_end;
 
 	dev_priv->gtt.mappable =
 		io_mapping_create_wc(dev_priv->gtt.mappable_base,
@@ -1699,7 +1699,7 @@ int i915_driver_unload(struct drm_device *dev)
 	if (dev_priv->mm.gtt_mtrr >= 0) {
 		mtrr_del(dev_priv->mm.gtt_mtrr,
 			 dev_priv->gtt.mappable_base,
-			 dev_priv->mm.gtt->gtt_mappable_entries * PAGE_SIZE);
+			 dev_priv->gtt.mappable_end);
 		dev_priv->mm.gtt_mtrr = -1;
 	}
 
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 8f74f3e..9265c0c 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -149,6 +149,7 @@ int
 i915_gem_init_ioctl(struct drm_device *dev, void *data,
 		    struct drm_file *file)
 {
+	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_i915_gem_init *args = data;
 
 	if (drm_core_check_feature(dev, DRIVER_MODESET))
@@ -165,6 +166,7 @@ i915_gem_init_ioctl(struct drm_device *dev, void *data,
 	mutex_lock(&dev->struct_mutex);
 	i915_gem_setup_global_gtt(dev, args->gtt_start, args->gtt_end,
 				  args->gtt_end);
+	dev_priv->gtt.mappable_end = args->gtt_end;
 	mutex_unlock(&dev->struct_mutex);
 
 	return 0;
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 0b89305..0f0db02 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -557,7 +557,6 @@ void i915_gem_setup_global_gtt(struct drm_device *dev,
 	}
 
 	dev_priv->gtt.start = start;
-	dev_priv->gtt.mappable_end = mappable_end;
 	dev_priv->gtt.total = end - start;
 
 	/* Clear any non-preallocated blocks */
@@ -596,7 +595,7 @@ void i915_gem_init_global_gtt(struct drm_device *dev)
 	int ret;
 
 	gtt_size = dev_priv->mm.gtt->gtt_total_entries << PAGE_SHIFT;
-	mappable_size = dev_priv->mm.gtt->gtt_mappable_entries << PAGE_SHIFT;
+	mappable_size = dev_priv->gtt.mappable_end;
 
 	if (intel_enable_ppgtt(dev) && HAS_ALIASING_PPGTT(dev)) {
 		/* PPGTT pdes are stolen from global gtt ptes, so shrink the
@@ -692,6 +691,7 @@ int i915_gem_gtt_init(struct drm_device *dev)
 	int ret;
 
 	dev_priv->gtt.mappable_base = pci_resource_start(dev->pdev, 2);
+	dev_priv->gtt.mappable_end = pci_resource_len(dev->pdev, 2);
 
 	/* On modern platforms we need not worry ourself with the legacy
 	 * hostbridge query stuff. Skip it entirely
@@ -735,14 +735,13 @@ int i915_gem_gtt_init(struct drm_device *dev)
 	else
 		dev_priv->mm.gtt->stolen_size = gen7_get_stolen_size(snb_gmch_ctl);
 
-	dev_priv->mm.gtt->gtt_mappable_entries = pci_resource_len(dev->pdev, 2) >> PAGE_SHIFT;
 	/* 64/512MB is the current min/max we actually know of, but this is just a
 	 * coarse sanity check.
 	 */
-	if ((dev_priv->mm.gtt->gtt_mappable_entries >> 8) < 64 ||
-	    dev_priv->mm.gtt->gtt_mappable_entries > dev_priv->mm.gtt->gtt_total_entries) {
-		DRM_ERROR("Unknown GMADR entries (%d)\n",
-			  dev_priv->mm.gtt->gtt_mappable_entries);
+	if ((dev_priv->gtt.mappable_end < (64<<20) ||
+	    (dev_priv->gtt.mappable_end > (512<<20)))) {
+		DRM_ERROR("Unknown GMADR size (%lx)\n",
+			  dev_priv->gtt.mappable_end);
 		ret = -ENXIO;
 		goto err_out;
 	}
@@ -764,7 +763,7 @@ int i915_gem_gtt_init(struct drm_device *dev)
 
 	/* GMADR is the PCI aperture used by SW to access tiled GFX surfaces in a linear fashion. */
 	DRM_INFO("Memory usable by graphics device = %dM\n", dev_priv->mm.gtt->gtt_total_entries >> 8);
-	DRM_DEBUG_DRIVER("GMADR size = %dM\n", dev_priv->mm.gtt->gtt_mappable_entries >> 8);
+	DRM_DEBUG_DRIVER("GMADR size = %ldM\n", dev_priv->gtt.mappable_end >> 20);
 	DRM_DEBUG_DRIVER("GTT stolen size = %dM\n", dev_priv->mm.gtt->stolen_size >> 20);
 
 	return 0;
diff --git a/drivers/gpu/drm/i915/intel_fb.c b/drivers/gpu/drm/i915/intel_fb.c
index ce02af8..ce5f544 100644
--- a/drivers/gpu/drm/i915/intel_fb.c
+++ b/drivers/gpu/drm/i915/intel_fb.c
@@ -135,8 +135,7 @@ static int intelfb_create(struct intel_fbdev *ifbdev,
 		goto out_unpin;
 	}
 	info->apertures->ranges[0].base = dev->mode_config.fb_base;
-	info->apertures->ranges[0].size =
-		dev_priv->mm.gtt->gtt_mappable_entries << PAGE_SHIFT;
+	info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
 
 	info->fix.smem_start = dev->mode_config.fb_base + obj->gtt_offset;
 	info->fix.smem_len = size;
