xe_vram_region_io_start
resource_size_t tile_io_start = xe_vram_region_io_start(tile_vram);
tile_offset = tile_io_start - xe_vram_region_io_start(xe->mem.vram);
phys_addr_t phys = cursor.start + xe_vram_region_io_start(tile->mem.vram);
resource_size_t xe_vram_region_io_start(const struct xe_vram_region *vram);