drm/i915: Stop putting GGTT VMA at the head of the list

Multiple GGTT VMAs per object will be introduced in the near future which will
make it impossible to guarantee normal GGTT view is at the head of the list.

Purpose of this patch is to break this assumption straight away so any
potential hidden assumptions in the code base can be bisected to this
simple patch.

For: VIZ-4544
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Suggested-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_gem.c

@@ -5303,11 +5303,13 @@ i915_gem_shrinker_oom(struct notifier_block *nb, unsigned long event, void *ptr)
 
 struct i915_vma *i915_gem_obj_to_ggtt(struct drm_i915_gem_object *obj)
 {
+	struct i915_address_space *ggtt = i915_obj_to_ggtt(obj);
 	struct i915_vma *vma;
 
-	vma = list_first_entry(&obj->vma_list, typeof(*vma), vma_link);
-	if (vma->vm != i915_obj_to_ggtt(obj))
-		return NULL;
+	list_for_each_entry(vma, &obj->vma_list, vma_link) {
+		if (vma->vm == ggtt)
+			return vma;
+	}
 
-	return vma;
+	return NULL;
 }

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -2202,13 +2202,9 @@ static struct i915_vma *__i915_gem_vma_create(struct drm_i915_gem_object *obj,
 		BUG();
 	}
 
-	/* Keep GGTT vmas first to make debug easier */
-	if (i915_is_ggtt(vm))
-		list_add(&vma->vma_link, &obj->vma_list);
-	else {
-		list_add_tail(&vma->vma_link, &obj->vma_list);
+	list_add_tail(&vma->vma_link, &obj->vma_list);
+	if (!i915_is_ggtt(vm))
 		i915_ppgtt_get(i915_vm_to_ppgtt(vm));
-	}
 
 	return vma;
 }