s390/pci: inform when missing required facilities

when we're missing the necessary machine facilities zPCI can not function. Until now it would silently fail to be initialized, add an informational print. Signed-off-by: Niklas Schnelle <[email protected]> Signed-off-by: Heiko Carstens <[email protected]>
ambv · Nov 18, 2020 · da78693 · da78693
1 parent ab177c5
commit da78693
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
@@ -851,8 +851,10 @@ static int __init pci_base_init(void)
 	if (!s390_pci_probe)
 		return 0;
 
-	if (!test_facility(69) || !test_facility(71))
+	if (!test_facility(69) || !test_facility(71)) {
+		pr_info("PCI is not supported because CPU facilities 69 or 71 are not available\n");
 		return 0;
+	}
 
 	if (test_facility(153) && !s390_pci_no_mio) {
 		static_branch_enable(&have_mio);