diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index b0cef4db2413..bc8935d3e5da 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -355,6 +355,12 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 	return 0;
 }
 
+/* combine single writes by using store-block insn */
+void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
+{
+       zpci_memcpy_toio(to, from, count);
+}
+
 /* Create a virtual mapping cookie for a PCI BAR */
 void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max)
 {