s390/sclp: detect cmma

Let's detect the Collaborative-memory-management-interpretation facility,
aka CMM assist, so we can correctly enable cmma later.
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

arch/s390/include/asm/sclp.h

@@ -62,6 +62,7 @@ struct sclp_info {
 	unsigned char has_sief2 : 1;
 	unsigned char has_64bscao : 1;
 	unsigned char has_gpere : 1;
+	unsigned char has_cmma : 1;
 	unsigned int ibc;
 	unsigned int mtid;
 	unsigned int mtid_cp;

drivers/s390/char/sclp_early.c

@@ -115,6 +115,7 @@ static void __init sclp_facilities_detect(struct read_info_sccb *sccb)
 	sclp.has_sprp = !!(sccb->fac84 & 0x02);
 	sclp.has_core_type = !!(sccb->fac84 & 0x01);
 	sclp.has_64bscao = !!(sccb->fac116 & 0x80);
+	sclp.has_cmma = !!(sccb->fac116 & 0x40);
 	sclp.has_esca = !!(sccb->fac116 & 0x08);
 	sclp.has_hvs = !!(sccb->fac119 & 0x80);
 	if (sccb->fac85 & 0x02)