DMEM_CHUNK_SIZE
res = request_free_mem_region(&iomem_resource, DMEM_CHUNK_SIZE * NR_CHUNKS,
ret = nouveau_bo_new_pin(&drm->client, NOUVEAU_GEM_DOMAIN_VRAM, DMEM_CHUNK_SIZE,
NR_CHUNKS * DMEM_CHUNK_SIZE >> 20, is_large ? "THP " : "", pfn_first,
#define DMEM_CHUNK_NPAGES (DMEM_CHUNK_SIZE >> PAGE_SHIFT)