drm/i915: Split insertion/binding of an object into the VM

Split the insertion into the address space's range manager and binding
of that object into the GTT to simplify the code flow when pinning a
VMA.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1470324762-2545-9-git-send-email-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_gem.c

@@ -2961,7 +2961,7 @@ static bool i915_gem_valid_gtt_space(struct i915_vma *vma,
  * @flags: mask of PIN_* flags to use
  */
 static struct i915_vma *
-i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj,
+i915_gem_object_insert_into_vm(struct drm_i915_gem_object *obj,
 			       struct i915_address_space *vm,
 			       const struct i915_ggtt_view *ggtt_view,
 			       u64 size,
@@ -3092,19 +3092,12 @@ i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj,
 	}
 	GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, obj->cache_level));
 
-	trace_i915_vma_bind(vma, flags);
-	ret = i915_vma_bind(vma, obj->cache_level, flags);
-	if (ret)
-		goto err_remove_node;
-
 	list_move_tail(&obj->global_list, &dev_priv->mm.bound_list);
 	list_move_tail(&vma->vm_link, &vm->inactive_list);
 	obj->bind_count++;
 
 	return vma;
 
-err_remove_node:
-	drm_mm_remove_node(&vma->node);
 err_vma:
 	vma = ERR_PTR(ret);
 err_unpin:
@@ -3764,17 +3757,17 @@ i915_gem_object_do_pin(struct drm_i915_gem_object *obj,
 		}
 	}
 
-	bound = vma ? vma->bound : 0;
 	if (vma == NULL || !drm_mm_node_allocated(&vma->node)) {
-		vma = i915_gem_object_bind_to_vm(obj, vm, ggtt_view,
+		vma = i915_gem_object_insert_into_vm(obj, vm, ggtt_view,
 						     size, alignment, flags);
 		if (IS_ERR(vma))
 			return PTR_ERR(vma);
-	} else {
+	}
+
+	bound = vma->bound;
 	ret = i915_vma_bind(vma, obj->cache_level, flags);
 	if (ret)
 		return ret;
-	}
 
 	if (ggtt_view && ggtt_view->type == I915_GGTT_VIEW_NORMAL &&
 	    (bound ^ vma->bound) & GLOBAL_BIND) {
@@ -3782,6 +3775,8 @@ i915_gem_object_do_pin(struct drm_i915_gem_object *obj,
 		WARN_ON(flags & PIN_MAPPABLE && !obj->map_and_fenceable);
 	}
 
+	GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
+
 	vma->pin_count++;
 	return 0;
 }