amdgpu_find_mm_node
nodes = amdgpu_find_mm_node(&abo->tbo.mem, &offset);
src_mm = amdgpu_find_mm_node(src->mem, &src->offset);
dst_mm = amdgpu_find_mm_node(dst->mem, &dst->offset);
mm = amdgpu_find_mm_node(&bo->mem, &offset);