linux/arch/s390/boot/pgm_check_info.c
Vasily Gorbik 724dc336b7 s390/startup: add pgm check info printing
Try to print out startup pgm check info including exact linux kernel
version, pgm interruption code and ilc, psw and general registers. Like
the following:

Linux version 5.3.0-rc7-07282-ge7b4d41d61bd-dirty (gor@tuxmaker) #3 SMP PREEMPT Thu Sep 5 16:07:34 CEST 2019
Kernel fault: interruption code 0005 ilc:2
PSW : 0000000180000000 0000000000012e52
      R:0 T:0 IO:0 EX:0 Key:0 M:0 W:0 P:0 AS:0 CC:0 PM:0 RI:0 EA:3
GPRS: 0000000000000000 00ffffffffffffff 0000000000000000 0000000000019a58
      000000000000bf68 0000000000000000 0000000000000000 0000000000000000
      0000000000000000 0000000000000000 000000000001a041 0000000000000000
      0000000004c9c000 0000000000010070 0000000000012e42 000000000000beb0

This info makes it apparent that kernel startup failed and might help
to understand what went wrong without actual standalone dump.

Printing code runs on its own stack of 1 page (at unused 0x5000), which
should be sufficient for sclp_early_printk usage (typical stack usage
observed has been around 512 bytes).

The code has pgm check recursion prevention, despite pgm check info
printing failure (follow on pgm check) or success it restores original
faulty psw and gprs and does disabled wait.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2019-09-13 12:17:37 +02:00

91 lines
2.3 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/string.h>
#include <asm/lowcore.h>
#include <asm/sclp.h>
#include "boot.h"
const char hex_asc[] = "0123456789abcdef";
#define add_val_as_hex(dst, val) \
__add_val_as_hex(dst, (const unsigned char *)&val, sizeof(val))
static char *__add_val_as_hex(char *dst, const unsigned char *src, size_t count)
{
while (count--)
dst = hex_byte_pack(dst, *src++);
return dst;
}
static char *add_str(char *dst, char *src)
{
strcpy(dst, src);
return dst + strlen(dst);
}
void print_pgm_check_info(void)
{
struct psw_bits *psw = &psw_bits(S390_lowcore.psw_save_area);
unsigned short ilc = S390_lowcore.pgm_ilc >> 1;
char buf[256];
int row, col;
char *p;
add_str(buf, "Linux version ");
strlcat(buf, kernel_version, sizeof(buf));
sclp_early_printk(buf);
p = add_str(buf, "Kernel fault: interruption code ");
p = add_val_as_hex(buf + strlen(buf), S390_lowcore.pgm_code);
p = add_str(p, " ilc:");
*p++ = hex_asc_lo(ilc);
add_str(p, "\n");
sclp_early_printk(buf);
p = add_str(buf, "PSW : ");
p = add_val_as_hex(p, S390_lowcore.psw_save_area.mask);
p = add_str(p, " ");
p = add_val_as_hex(p, S390_lowcore.psw_save_area.addr);
add_str(p, "\n");
sclp_early_printk(buf);
p = add_str(buf, " R:");
*p++ = hex_asc_lo(psw->per);
p = add_str(p, " T:");
*p++ = hex_asc_lo(psw->dat);
p = add_str(p, " IO:");
*p++ = hex_asc_lo(psw->io);
p = add_str(p, " EX:");
*p++ = hex_asc_lo(psw->ext);
p = add_str(p, " Key:");
*p++ = hex_asc_lo(psw->key);
p = add_str(p, " M:");
*p++ = hex_asc_lo(psw->mcheck);
p = add_str(p, " W:");
*p++ = hex_asc_lo(psw->wait);
p = add_str(p, " P:");
*p++ = hex_asc_lo(psw->pstate);
p = add_str(p, " AS:");
*p++ = hex_asc_lo(psw->as);
p = add_str(p, " CC:");
*p++ = hex_asc_lo(psw->cc);
p = add_str(p, " PM:");
*p++ = hex_asc_lo(psw->pm);
p = add_str(p, " RI:");
*p++ = hex_asc_lo(psw->ri);
p = add_str(p, " EA:");
*p++ = hex_asc_lo(psw->eaba);
add_str(p, "\n");
sclp_early_printk(buf);
for (row = 0; row < 4; row++) {
p = add_str(buf, row == 0 ? "GPRS:" : " ");
for (col = 0; col < 4; col++) {
p = add_str(p, " ");
p = add_val_as_hex(p, S390_lowcore.gpregs_save_area[row * 4 + col]);
}
add_str(p, "\n");
sclp_early_printk(buf);
}
}