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s390/sclp_early: Get rid of sclp_early_read_info_sccb_valid

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The early sclp detect functions gather the available SCLP facility
information. The sclp_early_read_info_sccb_valid indicates whether the
early sclp request was valid.  However, one external reference to it
checks for particular sclp facility bits and this should be sufficient.
Another occurance is in the sclp_get_ipl_info() function that is called
later.  Because all information are available at the early stage, save
the ipl information when detecting the sclp facilities.  Hence, no more
checks for sclp_early_read_info_sccb_valid are required.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Reviewed-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hendrik Brueckner 2013-12-05 18:46:51 +01:00 committed by Martin Schwidefsky
parent 41932bc1c8
commit 333cce91f3
3 changed files with 16 additions and 23 deletions
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1
drivers/s390/char/sclp.h
View file

@ -183,7 +183,6 @@ extern unsigned long sclp_console_full;
extern u8 sclp_fac84;
extern unsigned long long sclp_rzm;
extern unsigned long long sclp_rnmax;
extern __initdata int sclp_early_read_info_sccb_valid;
/* useful inlines */

2
drivers/s390/char/sclp_cmd.c
View file

@ -455,8 +455,6 @@ static int __init sclp_detect_standby_memory(void)
if (OLDMEM_BASE) /* No standby memory in kdump mode */
return 0;
if (!sclp_early_read_info_sccb_valid)
return 0;
if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
return 0;
rc = -ENOMEM;

36
drivers/s390/char/sclp_early.c
View file

@ -38,8 +38,8 @@ struct read_info_sccb {
static __initdata struct read_info_sccb early_read_info_sccb;
static __initdata char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE);
static unsigned long sclp_hsa_size;
static struct sclp_ipl_info sclp_ipl_info;
__initdata int sclp_early_read_info_sccb_valid;
u64 sclp_facilities;
u8 sclp_fac84;
unsigned long long sclp_rzm;
@ -63,10 +63,9 @@ static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
return rc;
}
static void __init sclp_read_info_early(void)
static int __init sclp_read_info_early(void)
{
int rc;
int i;
int rc, i;
struct read_info_sccb *sccb;
sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
SCLP_CMDW_READ_SCP_INFO};
@ -83,21 +82,19 @@ static void __init sclp_read_info_early(void)
if (rc)
break;
if (sccb->header.response_code == 0x10) {
sclp_early_read_info_sccb_valid = 1;
break;
}
if (sccb->header.response_code == 0x10)
return 0;
if (sccb->header.response_code != 0x1f0)
break;
}
return -EIO;
}
static void __init sclp_facilities_detect(void)
{
struct read_info_sccb *sccb;
sclp_read_info_early();
if (!sclp_early_read_info_sccb_valid)
if (sclp_read_info_early())
return;
sccb = &early_read_info_sccb;
@ -108,6 +105,12 @@ static void __init sclp_facilities_detect(void)
sclp_rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
sclp_rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
sclp_rzm <<= 20;
/* Save IPL information */
sclp_ipl_info.is_valid = 1;
if (sccb->flags & 0x2)
sclp_ipl_info.has_dump = 1;
memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
}
bool __init sclp_has_linemode(void)
@ -146,19 +149,12 @@ unsigned long long sclp_get_rzm(void)
/*
* This function will be called after sclp_facilities_detect(), which gets
* called from early.c code. Therefore the sccb should have valid contents.
* called from early.c code. The sclp_facilities_detect() function retrieves
* and saves the IPL information.
*/
void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
{
struct read_info_sccb *sccb;
if (!sclp_early_read_info_sccb_valid)
return;
sccb = &early_read_info_sccb;
info->is_valid = 1;
if (sccb->flags & 0x2)
info->has_dump = 1;
memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
*info = sclp_ipl_info;
}
static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb)