From: Sebastian Ott <sebott@linux.ibm.com>
Date: Tue, 12 Feb 2019 12:37:50 +0100
Subject: s390/sclp: detect DIRQ facility
Git-commit: 0a9fddfaa8ea0f66564329ce89390c8dd38b2df0
Patch-mainline: v5.2-rc1
References: jsc#SLE-5789 FATE#327042 bsc#1134730 LTC#173388

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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 arch/s390/include/asm/sclp.h   |    1 +
 drivers/s390/char/sclp_early.c |    4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

--- a/arch/s390/include/asm/sclp.h
+++ b/arch/s390/include/asm/sclp.h
@@ -78,6 +78,7 @@ struct sclp_info {
 	unsigned char has_kss : 1;
 	unsigned char has_gisaf : 1;
 	unsigned char has_diag318 : 1;
+	unsigned char has_dirq : 1;
 	unsigned int ibc;
 	unsigned int mtid;
 	unsigned int mtid_cp;
--- a/drivers/s390/char/sclp_early.c
+++ b/drivers/s390/char/sclp_early.c
@@ -55,7 +55,8 @@ struct read_info_sccb {
 	u32	hmfai;			/* 124-127 */
 	u8	_pad_128[134 - 128];	/* 128-133 */
 	u8	byte_134;			/* 134 */
-	u8	_pad_135[4096 - 135];	/* 135-4095 */
+	u8      cpudirq;                /* 135 */
+	u8	_pad_136[4096 - 136];	/* 136-4095 */
 } __packed __aligned(PAGE_SIZE);
 
 static struct sclp_ipl_info sclp_ipl_info;
@@ -155,6 +156,7 @@ static void __init sclp_early_facilities
 	sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
 
 	sclp.hmfai = sccb->hmfai;
+	sclp.has_dirq = !!(sccb->cpudirq & 0x80);
 }
 
 /*