mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Vasily Gorbik](/assets/img/avatar_default.png)
To enable early online memory detection sclp_early_read_info has been moved to sclp_early_core.c. sclp_info_sccb has been made a part of .boot.data, which allows to reuse it later during early kernel startup and make sclp_early_read_info call just once. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
156 lines
4 KiB
C
156 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* SCLP early driver
|
|
*
|
|
* Copyright IBM Corp. 2013
|
|
*/
|
|
|
|
#define KMSG_COMPONENT "sclp_early"
|
|
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
|
|
|
#include <linux/errno.h>
|
|
#include <asm/ctl_reg.h>
|
|
#include <asm/sclp.h>
|
|
#include <asm/ipl.h>
|
|
#include "sclp_sdias.h"
|
|
#include "sclp.h"
|
|
|
|
static struct sclp_ipl_info sclp_ipl_info;
|
|
|
|
struct sclp_info sclp;
|
|
EXPORT_SYMBOL(sclp);
|
|
|
|
static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb)
|
|
{
|
|
struct sclp_core_entry *cpue;
|
|
u16 boot_cpu_address, cpu;
|
|
|
|
if (sclp_early_get_info(sccb))
|
|
return;
|
|
|
|
sclp.facilities = sccb->facilities;
|
|
sclp.has_sprp = !!(sccb->fac84 & 0x02);
|
|
sclp.has_core_type = !!(sccb->fac84 & 0x01);
|
|
sclp.has_gsls = !!(sccb->fac85 & 0x80);
|
|
sclp.has_64bscao = !!(sccb->fac116 & 0x80);
|
|
sclp.has_cmma = !!(sccb->fac116 & 0x40);
|
|
sclp.has_esca = !!(sccb->fac116 & 0x08);
|
|
sclp.has_pfmfi = !!(sccb->fac117 & 0x40);
|
|
sclp.has_ibs = !!(sccb->fac117 & 0x20);
|
|
sclp.has_gisaf = !!(sccb->fac118 & 0x08);
|
|
sclp.has_hvs = !!(sccb->fac119 & 0x80);
|
|
sclp.has_kss = !!(sccb->fac98 & 0x01);
|
|
if (sccb->fac85 & 0x02)
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
|
|
if (sccb->fac91 & 0x40)
|
|
S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST;
|
|
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->hamaxpow && sccb->hamaxpow < 64)
|
|
sclp.hamax = (1UL << sccb->hamaxpow) - 1;
|
|
else
|
|
sclp.hamax = U64_MAX;
|
|
|
|
if (!sccb->hcpua) {
|
|
if (MACHINE_IS_VM)
|
|
sclp.max_cores = 64;
|
|
else
|
|
sclp.max_cores = sccb->ncpurl;
|
|
} else {
|
|
sclp.max_cores = sccb->hcpua + 1;
|
|
}
|
|
|
|
boot_cpu_address = stap();
|
|
cpue = (void *)sccb + sccb->cpuoff;
|
|
for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
|
|
if (boot_cpu_address != cpue->core_id)
|
|
continue;
|
|
sclp.has_siif = cpue->siif;
|
|
sclp.has_sigpif = cpue->sigpif;
|
|
sclp.has_sief2 = cpue->sief2;
|
|
sclp.has_gpere = cpue->gpere;
|
|
sclp.has_ib = cpue->ib;
|
|
sclp.has_cei = cpue->cei;
|
|
sclp.has_skey = cpue->skey;
|
|
break;
|
|
}
|
|
|
|
/* Save IPL information */
|
|
sclp_ipl_info.is_valid = 1;
|
|
if (sccb->fac91 & 0x2)
|
|
sclp_ipl_info.has_dump = 1;
|
|
memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
|
|
|
|
if (sccb->hsa_size)
|
|
sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE;
|
|
sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
|
|
sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
|
|
sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
|
|
|
|
sclp.hmfai = sccb->hmfai;
|
|
}
|
|
|
|
/*
|
|
* This function will be called after sclp_early_facilities_detect(), which gets
|
|
* called from early.c code. The sclp_early_facilities_detect() function retrieves
|
|
* and saves the IPL information.
|
|
*/
|
|
void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)
|
|
{
|
|
*info = sclp_ipl_info;
|
|
}
|
|
|
|
static struct sclp_core_info sclp_early_core_info __initdata;
|
|
static int sclp_early_core_info_valid __initdata;
|
|
|
|
static void __init sclp_early_init_core_info(struct read_cpu_info_sccb *sccb)
|
|
{
|
|
if (!SCLP_HAS_CPU_INFO)
|
|
return;
|
|
memset(sccb, 0, sizeof(*sccb));
|
|
sccb->header.length = sizeof(*sccb);
|
|
if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb))
|
|
return;
|
|
if (sccb->header.response_code != 0x0010)
|
|
return;
|
|
sclp_fill_core_info(&sclp_early_core_info, sccb);
|
|
sclp_early_core_info_valid = 1;
|
|
}
|
|
|
|
int __init sclp_early_get_core_info(struct sclp_core_info *info)
|
|
{
|
|
if (!sclp_early_core_info_valid)
|
|
return -EIO;
|
|
*info = sclp_early_core_info;
|
|
return 0;
|
|
}
|
|
|
|
static void __init sclp_early_console_detect(struct init_sccb *sccb)
|
|
{
|
|
if (sccb->header.response_code != 0x20)
|
|
return;
|
|
|
|
if (sclp_early_con_check_vt220(sccb))
|
|
sclp.has_vt220 = 1;
|
|
|
|
if (sclp_early_con_check_linemode(sccb))
|
|
sclp.has_linemode = 1;
|
|
}
|
|
|
|
void __init sclp_early_detect(void)
|
|
{
|
|
void *sccb = &sclp_early_sccb;
|
|
|
|
sclp_early_facilities_detect(sccb);
|
|
sclp_early_init_core_info(sccb);
|
|
|
|
/*
|
|
* Turn off SCLP event notifications. Also save remote masks in the
|
|
* sccb. These are sufficient to detect sclp console capabilities.
|
|
*/
|
|
sclp_early_set_event_mask(sccb, 0, 0);
|
|
sclp_early_console_detect(sccb);
|
|
}
|