s390/sclp: add sclp_get_ibc function

The patch adds functionality to retrieve the IBC configuration
by means of function sclp_get_ibc().

Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/s390/char/sclp_early.c b/drivers/s390/char/sclp_early.c
index b57fe0efb422..1918d9dff45d 100644
--- a/drivers/s390/char/sclp_early.c
+++ b/drivers/s390/char/sclp_early.c
@@ -27,7 +27,9 @@ struct read_info_sccb {
         u8      loadparm[8];            /* 24-31 */
         u8      _reserved1[48 - 32];    /* 32-47 */
         u64     facilities;             /* 48-55 */
-        u8      _reserved2[84 - 56];    /* 56-83 */
+        u8      _reserved2a[76 - 56];   /* 56-75 */
+        u32     ibc;                    /* 76-79 */
+        u8      _reserved2b[84 - 80];   /* 80-83 */
         u8      fac84;                  /* 84 */
         u8      fac85;                  /* 85 */
         u8      _reserved3[91 - 86];    /* 86-90 */
@@ -47,6 +49,7 @@ static unsigned long sclp_hsa_size;
 static unsigned int sclp_max_cpu;
 static struct sclp_ipl_info sclp_ipl_info;
 static unsigned char sclp_siif;
+static u32 sclp_ibc;
 
 u64 sclp_facilities;
 u8 sclp_fac84;
@@ -111,6 +114,7 @@ static void __init sclp_facilities_detect(struct read_info_sccb *sccb)
         sclp_rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
         sclp_rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
         sclp_rzm <<= 20;
+        sclp_ibc = sccb->ibc;
 
         if (!sccb->hcpua) {
                 if (MACHINE_IS_VM)
@@ -168,6 +172,12 @@ int sclp_has_siif(void)
 }
 EXPORT_SYMBOL(sclp_has_siif);
 
+unsigned int sclp_get_ibc(void)
+{
+        return sclp_ibc;
+}
+EXPORT_SYMBOL(sclp_get_ibc);
+
 /*
  * This function will be called after sclp_facilities_detect(), which gets
  * called from early.c code. The sclp_facilities_detect() function retrieves