drm/i915: don't allocate the ring in stolen if we lack aperture

Since we have no way access it from the CPU. For such cases just
fallback to internal objects.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20191029095856.25431-6-matthew.auld@intel.com

drivers/gpu/drm/i915/gt/intel_ring.c

@@ -108,7 +108,9 @@ static struct i915_vma *create_ring_vma(struct i915_ggtt *ggtt, int size)
 	struct drm_i915_gem_object *obj;
 	struct i915_vma *vma;
 
-	obj = i915_gem_object_create_stolen(i915, size);
+	obj = ERR_PTR(-ENODEV);
+	if (i915_ggtt_has_aperture(ggtt))
+		obj = i915_gem_object_create_stolen(i915, size);
 	if (IS_ERR(obj))
 		obj = i915_gem_object_create_internal(i915, size);
 	if (IS_ERR(obj))