drm: Change create block to reserve node

With the previous patch we no longer actually create a node, we simply
find the correct hole and occupy it. This very well could have been
squashed with the last patch, but since I already had David's review, I
figured it's easiest to keep it distinct.

Also update the users in i915. Conveniently this is the only user of the
interface.

CC: David Airlie <airlied@linux.ie>
CC: <dri-devel@lists.freedesktop.org>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Acked-by: David Airlie <airlied@linux.ie>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/drm_mm.c

@@ -147,27 +147,27 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
 	}
 }
 
-int drm_mm_create_block(struct drm_mm *mm, struct drm_mm_node *node,
-			unsigned long start, unsigned long size)
+int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node)
 {
 	struct drm_mm_node *hole;
-	unsigned long end = start + size;
+	unsigned long end = node->start + node->size;
 	unsigned long hole_start;
 	unsigned long hole_end;
 
+	BUG_ON(node == NULL);
+
+	/* Find the relevant hole to add our node to */
 	drm_mm_for_each_hole(hole, mm, hole_start, hole_end) {
-		if (hole_start > start || hole_end < end)
+		if (hole_start > node->start || hole_end < end)
 			continue;
 
-		node->start = start;
-		node->size = size;
 		node->mm = mm;
 		node->allocated = 1;
 
 		INIT_LIST_HEAD(&node->hole_stack);
 		list_add(&node->node_list, &hole->node_list);
 
-		if (start == hole_start) {
+		if (node->start == hole_start) {
 			hole->hole_follows = 0;
 			list_del_init(&hole->hole_stack);
 		}
@@ -181,10 +181,11 @@ int drm_mm_create_block(struct drm_mm *mm, struct drm_mm_node *node,
 		return 0;
 	}
 
-	WARN(1, "no hole found for block 0x%lx + 0x%lx\n", start, size);
+	WARN(1, "no hole found for node 0x%lx + 0x%lx\n",
+	     node->start, node->size);
 	return -ENOSPC;
 }
-EXPORT_SYMBOL(drm_mm_create_block);
+EXPORT_SYMBOL(drm_mm_reserve_node);
 
 struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *hole_node,
 					     unsigned long size,

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -640,10 +640,10 @@ void i915_gem_setup_global_gtt(struct drm_device *dev,
 				  obj->gtt_offset);
 			continue;
 		}
-		ret = drm_mm_create_block(&dev_priv->mm.gtt_space,
-					  obj->gtt_space,
-					  obj->gtt_offset,
-					  obj->base.size);
+		obj->gtt_space->start = obj->gtt_offset;
+		obj->gtt_space->size = obj->base.size;
+		ret = drm_mm_reserve_node(&dev_priv->mm.gtt_space,
+					  obj->gtt_space);
 		if (ret) {
 			DRM_DEBUG_KMS("Reservation failed\n");
 			kfree(obj->gtt_space);

drivers/gpu/drm/i915/i915_gem_stolen.c

@@ -349,8 +349,9 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
 	if (!stolen)
 		return NULL;
 
-	ret = drm_mm_create_block(&dev_priv->mm.stolen, stolen, stolen_offset,
-				  size);
+	stolen->start = stolen_offset;
+	stolen->size = size;
+	ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
 	if (ret) {
 		DRM_DEBUG_KMS("failed to allocate stolen space\n");
 		kfree(stolen);
@@ -380,9 +381,10 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
 			goto unref_out;
 		}
 
-		ret = drm_mm_create_block(&dev_priv->mm.gtt_space,
-					  obj->gtt_space,
-					  gtt_offset, size);
+		obj->gtt_space->start = gtt_offset;
+		obj->gtt_space->size = size;
+		ret = drm_mm_reserve_node(&dev_priv->mm.gtt_space,
+					  obj->gtt_space);
 		if (ret) {
 			DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
 			goto free_out;

include/drm/drm_mm.h

@@ -138,10 +138,7 @@ static inline unsigned long drm_mm_hole_node_end(struct drm_mm_node *hole_node)
 /*
  * Basic range manager support (drm_mm.c)
  */
-extern int drm_mm_create_block(struct drm_mm *mm,
-			       struct drm_mm_node *node,
-			       unsigned long start,
-			       unsigned long size);
+extern int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node);
 extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
 						    unsigned long size,
 						    unsigned alignment,