drm/i915: Track page table backing store usage

Account page table backing store against the owning client memory usage
stats.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231107101806.608990-3-tvrtko.ursulin@linux.intel.com

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

@@ -63,6 +63,9 @@ struct drm_i915_gem_object *alloc_pt_lmem(struct i915_address_space *vm, int sz)
 	if (!IS_ERR(obj)) {
 		obj->base.resv = i915_vm_resv_get(vm);
 		obj->shares_resv_from = vm;
+
+		if (vm->fpriv)
+			i915_drm_client_add_object(vm->fpriv->client, obj);
 	}
 
 	return obj;
@@ -84,6 +87,9 @@ struct drm_i915_gem_object *alloc_pt_dma(struct i915_address_space *vm, int sz)
 	if (!IS_ERR(obj)) {
 		obj->base.resv = i915_vm_resv_get(vm);
 		obj->shares_resv_from = vm;
+
+		if (vm->fpriv)
+			i915_drm_client_add_object(vm->fpriv->client, obj);
 	}
 
 	return obj;