drm/i915/selftests/perf: watch out for stolen objects

Stolen memory is allocated at creation, returning -ENOSPC if we run out
space.

Closes: https://gitlab.freedesktop.org/drm/intel/issues/1424Signed-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/20200323110301.38806-1-matthew.auld@intel.com

drivers/gpu/drm/i915/selftests/intel_memory_region.c

@@ -594,8 +594,11 @@ create_region_for_mapping(struct intel_memory_region *mr, u64 size, u32 type,
 	void *addr;
 
 	obj = i915_gem_object_create_region(mr, size, 0);
-	if (IS_ERR(obj))
+	if (IS_ERR(obj)) {
+		if (PTR_ERR(obj) == -ENOSPC) /* Stolen memory */
+			return ERR_PTR(-ENODEV);
 		return obj;
+	}
 
 	addr = i915_gem_object_pin_map(obj, type);
 	if (IS_ERR(addr)) {