[Intel-gfx] [PATCH 1/5] drm/i915: Assert that the partial VMA fits within the object

[Chris Wilson]

When creating a partial VMA assert that it first fits with the parent
object, and that if it covers the whole of the parent a normal view was
created instead.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_vma.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index cfec4222b04e..3229f37eabea 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -95,8 +95,13 @@ __i915_vma_create(struct drm_i915_gem_object *obj,
 	if (view) {
 		vma->ggtt_view = *view;
 		if (view->type == I915_GGTT_VIEW_PARTIAL) {
+			GEM_BUG_ON(range_overflows_t(u64,
+						     view->params.partial.offset,
+						     view->params.partial.size,
+						     obj->base.size >> PAGE_SHIFT));
 			vma->size = view->params.partial.size;
 			vma->size <<= PAGE_SHIFT;
+			GEM_BUG_ON(vma->size >= obj->base.size);
 		} else if (view->type == I915_GGTT_VIEW_ROTATED) {
 			vma->size =
 				intel_rotation_info_size(&view->params.rotated);
-- 
2.11.0