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s390/sclp: add detection of IPL-complete-control facility

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The presence of the IPL-complete-control facility can be derived
from the hypervisor's SCLP info response.

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Alexander Egorenkov 2021-09-03 09:39:48 +02:00 committed by Heiko Carstens
parent af2d861d4c
commit 1b553839e1
2 changed files with 4 additions and 1 deletions
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1
arch/s390/include/asm/sclp.h
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@ -87,6 +87,7 @@ struct sclp_info {
unsigned char has_diag318 : 1;
unsigned char has_sipl : 1;
unsigned char has_dirq : 1;
unsigned char has_iplcc : 1;
unsigned int ibc;
unsigned int mtid;
unsigned int mtid_cp;

4
drivers/s390/char/sclp_early.c
View File

@ -49,8 +49,10 @@ static void __init sclp_early_facilities_detect(void)
S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
if (sccb->fac91 & 0x40)
S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST;
if (sccb->cpuoff > 134)
if (sccb->cpuoff > 134) {
sclp.has_diag318 = !!(sccb->byte_134 & 0x80);
sclp.has_iplcc = !!(sccb->byte_134 & 0x02);
}
if (sccb->cpuoff > 137)
sclp.has_sipl = !!(sccb->cbl & 0x4000);
sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;