s390/sclp: detect DIRQ facility

Detect the adapter CPU directed interruption facility.
Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/asm/sclp.h

@@ -81,6 +81,7 @@ struct sclp_info {
 	unsigned char has_diag318 : 1;
 	unsigned char has_sipl : 1;
 	unsigned char has_sipl_g2 : 1;
+	unsigned char has_dirq : 1;
 	unsigned int ibc;
 	unsigned int mtid;
 	unsigned int mtid_cp;

drivers/s390/char/sclp.h

@@ -197,7 +197,7 @@ struct read_info_sccb {
 	u32	hmfai;			/* 124-127 */
 	u8	_pad_128[134 - 128];	/* 128-133 */
 	u8	byte_134;			/* 134 */
-	u8	_pad_135;		/* 135 */
+	u8	cpudirq;		/* 135 */
 	u16	cbl;			/* 136-137 */
 	u8	_pad_138[4096 - 138];	/* 138-4095 */
 } __packed __aligned(PAGE_SIZE);

drivers/s390/char/sclp_early.c

@@ -95,6 +95,7 @@ static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb)
 	sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
 
 	sclp.hmfai = sccb->hmfai;
+	sclp.has_dirq = !!(sccb->cpudirq & 0x80);
 }
 
 /*