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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>
This commit is contained in:
Michael Mueller 2014-03-15 18:16:26 +01:00 committed by Christian Borntraeger
parent 4953919fee
commit 570126d370
2 changed files with 12 additions and 1 deletions
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1
arch/s390/include/asm/sclp.h
View File

@ -66,5 +66,6 @@ int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode);
unsigned long sclp_get_hsa_size(void);
void sclp_early_detect(void);
int sclp_has_siif(void);
unsigned int sclp_get_ibc(void);
#endif /* _ASM_S390_SCLP_H */

12
drivers/s390/char/sclp_early.c
View File

@ -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