drm/i915: remove intel_gtt structure

With the probe call in our dispatch table, we can now cut away the
last three remaining members in the intel_gtt shared struct and so
remove it completely.

v2: Rebased on top of Daniel's series

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
[danvet: bikeshed commit message a bit.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.h

@@ -406,6 +406,7 @@ struct i915_gtt {
 				   unsigned int pg_start,
 				   enum i915_cache_level cache_level);
 };
+#define gtt_total_entries(gtt) ((gtt).total >> PAGE_SHIFT)
 
 #define I915_PPGTT_PD_ENTRIES 512
 #define I915_PPGTT_PT_ENTRIES 1024
@@ -696,8 +697,6 @@ struct intel_l3_parity {
 };
 
 struct i915_gem_mm {
-	/** Bridge to intel-gtt-ko */
-	struct intel_gtt *gtt;
 	/** Memory allocator for GTT stolen memory */
 	struct drm_mm stolen;
 	/** Memory allocator for GTT */

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -182,7 +182,8 @@ static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
 	/* ppgtt PDEs reside in the global gtt pagetable, which has 512*1024
 	 * entries. For aliasing ppgtt support we just steal them at the end for
 	 * now. */
-	first_pd_entry_in_global_pt = dev_priv->mm.gtt->gtt_total_entries - I915_PPGTT_PD_ENTRIES;
+	first_pd_entry_in_global_pt =
+		gtt_total_entries(dev_priv->gtt) - I915_PPGTT_PD_ENTRIES;
 
 	ppgtt->num_pd_entries = I915_PPGTT_PD_ENTRIES;
 	ppgtt->clear_range = gen6_ppgtt_clear_range;
@@ -473,7 +474,7 @@ static void gen6_ggtt_clear_range(struct drm_device *dev,
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	gtt_pte_t scratch_pte;
 	gtt_pte_t __iomem *gtt_base = (gtt_pte_t __iomem *) dev_priv->gtt.gsm + first_entry;
-	const int max_entries = dev_priv->mm.gtt->gtt_total_entries - first_entry;
+	const int max_entries = gtt_total_entries(dev_priv->gtt) - first_entry;
 	int i;
 
 	if (WARN(num_entries > max_entries,
@@ -634,7 +635,7 @@ void i915_gem_init_global_gtt(struct drm_device *dev)
 	unsigned long gtt_size, mappable_size;
 	int ret;
 
-	gtt_size = dev_priv->mm.gtt->gtt_total_entries << PAGE_SHIFT;
+	gtt_size = dev_priv->gtt.total;
 	mappable_size = dev_priv->gtt.mappable_end;
 
 	if (intel_enable_ppgtt(dev) && HAS_ALIASING_PPGTT(dev)) {
@@ -778,7 +779,6 @@ void gen6_gmch_remove(struct drm_device *dev)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	iounmap(dev_priv->gtt.gsm);
 	teardown_scratch_page(dev_priv->dev);
-	kfree(dev_priv->mm.gtt);
 }
 
 static int i915_gmch_probe(struct drm_device *dev,
@@ -788,22 +788,13 @@ static int i915_gmch_probe(struct drm_device *dev,
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int ret;
 
-	/* This is a temporary hack to make the code cleaner in
-	 * i915_gem_gtt_init. I promise it will go away very shortly. */
-	kfree(dev_priv->mm.gtt);
-
 	ret = intel_gmch_probe(dev_priv->bridge_dev, dev_priv->dev->pdev, NULL);
 	if (!ret) {
 		DRM_ERROR("failed to set up gmch\n");
 		return -EIO;
 	}
 
-	dev_priv->mm.gtt = intel_gtt_get();
-	if (!dev_priv->mm.gtt) {
-		DRM_ERROR("Failed to initialize GTT\n");
-		intel_gmch_remove();
-		return -ENODEV;
-	}
+	intel_gtt_get(gtt_total, stolen);
 
 	dev_priv->gtt.do_idle_maps = needs_idle_maps(dev_priv->dev);
 	dev_priv->gtt.gtt_clear_range = i915_ggtt_clear_range;
@@ -824,10 +815,6 @@ int i915_gem_gtt_init(struct drm_device *dev)
 	unsigned long gtt_size;
 	int ret;
 
-	dev_priv->mm.gtt = kzalloc(sizeof(*dev_priv->mm.gtt), GFP_KERNEL);
-	if (!dev_priv->mm.gtt)
-		return -ENOMEM;
-
 	gtt->mappable_base = pci_resource_start(dev->pdev, 2);
 	gtt->mappable_end = pci_resource_len(dev->pdev, 2);
 
@@ -841,13 +828,8 @@ int i915_gem_gtt_init(struct drm_device *dev)
 
 	ret = dev_priv->gtt.gtt_probe(dev, &dev_priv->gtt.total,
 				     &dev_priv->gtt.stolen_size);
-	if (ret) {
-		kfree(dev_priv->mm.gtt);
+	if (ret)
 		return ret;
-	}
-
-	dev_priv->mm.gtt->gtt_total_entries = dev_priv->gtt.total >> PAGE_SHIFT;
-	dev_priv->mm.gtt->stolen_size = dev_priv->gtt.stolen_size;
 
 	gtt_size = (dev_priv->gtt.total >> PAGE_SHIFT) * sizeof(gtt_pte_t);
 

drivers/gpu/drm/i915/i915_gem_stolen.c

@@ -187,11 +187,11 @@ int i915_gem_init_stolen(struct drm_device *dev)
 	if (dev_priv->mm.stolen_base == 0)
 		return 0;
 
-	DRM_DEBUG_KMS("found %d bytes of stolen memory at %08lx\n",
-		      dev_priv->mm.gtt->stolen_size, dev_priv->mm.stolen_base);
+	DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
+		      dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);
 
 	/* Basic memrange allocator for stolen space */
-	drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->mm.gtt->stolen_size);
+	drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size);
 
 	return 0;
 }
@@ -205,7 +205,7 @@ i915_pages_create_for_stolen(struct drm_device *dev,
 	struct scatterlist *sg;
 
 	DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
-	BUG_ON(offset > dev_priv->mm.gtt->stolen_size - size);
+	BUG_ON(offset > dev_priv->gtt.stolen_size - size);
 
 	/* We hide that we have no struct page backing our stolen object
 	 * by wrapping the contiguous physical allocation with a fake