mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-26 23:20:58 +07:00
83119ad4a1
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>
117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
/*
|
|
* drivers/s390/char/sclp_info.c
|
|
*
|
|
* Copyright IBM Corp. 2007
|
|
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/string.h>
|
|
#include <asm/sclp.h>
|
|
#include "sclp.h"
|
|
|
|
struct sclp_readinfo_sccb {
|
|
struct sccb_header header; /* 0-7 */
|
|
u16 rnmax; /* 8-9 */
|
|
u8 rnsize; /* 10 */
|
|
u8 _reserved0[24 - 11]; /* 11-23 */
|
|
u8 loadparm[8]; /* 24-31 */
|
|
u8 _reserved1[48 - 32]; /* 32-47 */
|
|
u64 facilities; /* 48-55 */
|
|
u8 _reserved2[91 - 56]; /* 56-90 */
|
|
u8 flags; /* 91 */
|
|
u8 _reserved3[100 - 92]; /* 92-99 */
|
|
u32 rnsize2; /* 100-103 */
|
|
u64 rnmax2; /* 104-111 */
|
|
u8 _reserved4[4096 - 112]; /* 112-4095 */
|
|
} __attribute__((packed, aligned(4096)));
|
|
|
|
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;
|
|
int i;
|
|
struct sclp_readinfo_sccb *sccb;
|
|
sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
|
|
SCLP_CMDW_READ_SCP_INFO};
|
|
|
|
/* Enable service signal subclass mask. */
|
|
__ctl_set_bit(0, 9);
|
|
sccb = &early_readinfo_sccb;
|
|
for (i = 0; i < ARRAY_SIZE(commands); i++) {
|
|
do {
|
|
memset(sccb, 0, sizeof(*sccb));
|
|
sccb->header.length = sizeof(*sccb);
|
|
sccb->header.control_mask[2] = 0x80;
|
|
ret = sclp_service_call(commands[i], sccb);
|
|
} while (ret == -EBUSY);
|
|
|
|
if (ret)
|
|
break;
|
|
__load_psw_mask(PSW_BASE_BITS | PSW_MASK_EXT |
|
|
PSW_MASK_WAIT | PSW_DEFAULT_KEY);
|
|
local_irq_disable();
|
|
/*
|
|
* Contents of the sccb might have changed
|
|
* therefore a barrier is needed.
|
|
*/
|
|
barrier();
|
|
if (sccb->header.response_code == 0x10) {
|
|
early_readinfo_sccb_valid = 1;
|
|
break;
|
|
}
|
|
if (sccb->header.response_code != 0x1f0)
|
|
break;
|
|
}
|
|
/* Disable service signal subclass mask again. */
|
|
__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;
|
|
struct sclp_readinfo_sccb *sccb;
|
|
|
|
if (!early_readinfo_sccb_valid)
|
|
return 0;
|
|
sccb = &early_readinfo_sccb;
|
|
if (sccb->rnsize)
|
|
memsize = sccb->rnsize << 20;
|
|
else
|
|
memsize = sccb->rnsize2 << 20;
|
|
if (sccb->rnmax)
|
|
memsize *= sccb->rnmax;
|
|
else
|
|
memsize *= sccb->rnmax2;
|
|
return memsize;
|
|
}
|
|
|
|
/*
|
|
* This function will be called after sclp_memory_detect(), which gets called
|
|
* early from early.c code. Therefore the sccb should have valid contents.
|
|
*/
|
|
void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
|
|
{
|
|
struct sclp_readinfo_sccb *sccb;
|
|
|
|
if (!early_readinfo_sccb_valid)
|
|
return;
|
|
sccb = &early_readinfo_sccb;
|
|
info->is_valid = 1;
|
|
if (sccb->flags & 0x2)
|
|
info->has_dump = 1;
|
|
memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
|
|
}
|