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[S390] sclp: Test facility list before executing a service call.

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Check if a command is available before executing. Saves some
superfluous service calls that won't succeed anyway.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2007-07-10 11:24:10 +02:00 committed by Martin Schwidefsky
parent 05dd25307c
commit 83119ad4a1
5 changed files with 20 additions and 0 deletions
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1
arch/s390/kernel/early.c
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@ -275,6 +275,7 @@ void __init startup_init(void)
sort_main_extable();
setup_lowcore_early();
sclp_readinfo_early();
sclp_facilities_detect();
memsize = sclp_memory_detect();
#ifndef CONFIG_64BIT
/*

5
drivers/s390/char/sclp.h
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@ -79,6 +79,11 @@ struct sccb_header {
u16 response_code;
} __attribute__((packed));
extern u64 sclp_facilities;
#define SCLP_HAS_CHP_INFO (sclp_facilities & 0x8000000000000000ULL)
#define SCLP_HAS_CHP_RECONFIG (sclp_facilities & 0x2000000000000000ULL)
struct gds_subvector {
u8 length;
u8 key;

4
drivers/s390/char/sclp_chp.c
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@ -55,6 +55,8 @@ static int do_configure(sclp_cmdw_t cmd)
struct chp_cfg_data *data;
int rc;
if (!SCLP_HAS_CHP_RECONFIG)
return -EOPNOTSUPP;
/* Prepare sccb. */
data = (struct chp_cfg_data *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!data)
@ -152,6 +154,8 @@ int sclp_chp_read_info(struct sclp_chp_info *info)
struct chp_info_data *data;
int rc;
if (!SCLP_HAS_CHP_INFO)
return -EOPNOTSUPP;
/* Prepare sccb. */
data = (struct chp_info_data *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!data)

9
drivers/s390/char/sclp_info.c
View File

@ -30,6 +30,8 @@ struct sclp_readinfo_sccb {
static struct sclp_readinfo_sccb __initdata early_readinfo_sccb;
static int __initdata early_readinfo_sccb_valid;
u64 sclp_facilities;
void __init sclp_readinfo_early(void)
{
int ret;
@ -70,6 +72,13 @@ void __init sclp_readinfo_early(void)
__ctl_clear_bit(0, 9);
}
void __init sclp_facilities_detect(void)
{
if (!early_readinfo_sccb_valid)
return;
sclp_facilities = early_readinfo_sccb.facilities;
}
unsigned long long __init sclp_memory_detect(void)
{
unsigned long long memsize;

1
include/asm-s390/sclp.h
View File

@ -28,6 +28,7 @@ struct sclp_ipl_info {
};
void sclp_readinfo_early(void);
void sclp_facilities_detect(void);
unsigned long long sclp_memory_detect(void);
int sclp_sdias_blk_count(void);
int sclp_sdias_copy(void *dest, int blk_num, int nr_blks);