+ switch (whandle->type) {
+ case WINSYS_HANDLE_TYPE_SHARED:
+ rsc->bo = vc4_bo_open_name(screen, whandle->handle);
+ break;
+ case WINSYS_HANDLE_TYPE_FD:
+ rsc->bo = vc4_bo_open_dmabuf(screen, whandle->handle);
+ break;
+ default:
+ fprintf(stderr,
+ "Attempt to import unsupported handle type %d\n",
+ whandle->type);
+ }
+
+ if (!rsc->bo)
+ goto fail;
+
+ struct drm_vc4_get_tiling get_tiling = {
+ .handle = rsc->bo->handle,
+ };
+ int ret = vc4_ioctl(screen->fd, DRM_IOCTL_VC4_GET_TILING, &get_tiling);
+
+ if (ret != 0) {
+ whandle->modifier = DRM_FORMAT_MOD_LINEAR;
+ } else if (whandle->modifier == DRM_FORMAT_MOD_INVALID) {
+ whandle->modifier = get_tiling.modifier;
+ } else if (whandle->modifier != get_tiling.modifier) {
+ fprintf(stderr,
+ "Modifier 0x%llx vs. tiling (0x%llx) mismatch\n",
+ (long long)whandle->modifier, get_tiling.modifier);
+ goto fail;
+ }
+
+ switch (whandle->modifier) {
+ case DRM_FORMAT_MOD_LINEAR:
+ rsc->tiled = false;
+ break;
+ case DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED:
+ rsc->tiled = true;
+ break;
+ default:
+ fprintf(stderr,
+ "Attempt to import unsupported modifier 0x%llx\n",
+ (long long)whandle->modifier);
+ goto fail;
+ }
+
+ rsc->vc4_format = get_resource_texture_format(prsc);
+ vc4_setup_slices(rsc, "import");
+
+ if (whandle->offset != 0) {
+ if (rsc->tiled) {
+ fprintf(stderr,
+ "Attempt to import unsupported "
+ "winsys offset %u\n",
+ whandle->offset);
+ goto fail;
+ }
+
+ rsc->slices[0].offset += whandle->offset;
+
+ if (rsc->slices[0].offset + rsc->slices[0].size >
+ rsc->bo->size) {
+ fprintf(stderr, "Attempt to import "
+ "with overflowing offset (%d + %d > %d)\n",
+ whandle->offset,
+ rsc->slices[0].size,
+ rsc->bo->size);
+ goto fail;
+ }
+ }
+
+ if (screen->ro) {
+ /* Make sure that renderonly has a handle to our buffer in the
+ * display's fd, so that a later renderonly_get_handle()
+ * returns correct handles or GEM names.
+ */
+ rsc->scanout =
+ renderonly_create_gpu_import_for_resource(prsc,
+ screen->ro,
+ NULL);
+ if (!rsc->scanout)
+ goto fail;
+ }
+
+ if (rsc->tiled && whandle->stride != slice->stride) {