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s390/boot: Dump message ring buffer on crash with bootdebug

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Dump the boot message ring buffer when a crash occurs during boot, but
only if bootdebug is enabled. This helps assist in analyzing boot-time
issues by providing additional debugging information.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2024-11-20 20:30:10 +01:00 committed by Alexander Gordeev
parent b79015ae63
commit b2a992a55f
3 changed files with 21 additions and 0 deletions
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1
arch/s390/boot/boot.h
View File

@ -76,6 +76,7 @@ int __printf(1, 2) boot_printk(const char *fmt, ...);
void print_stacktrace(unsigned long sp);
void error(char *m);
int get_random(unsigned long limit, unsigned long *value);
void boot_rb_dump(void);
#ifndef boot_fmt
#define boot_fmt(fmt) fmt

2
arch/s390/boot/pgm_check_info.c
View File

@ -37,6 +37,8 @@ void print_pgm_check_info(void)
unsigned long *gpregs = (unsigned long *)get_lowcore()->gpregs_save_area;
struct psw_bits *psw = &psw_bits(get_lowcore()->psw_save_area);
if (bootdebug)
boot_rb_dump();
boot_emerg("Linux version %s\n", kernel_version);
if (!is_prot_virt_guest() && early_command_line[0])
boot_emerg("Kernel command line: %s\n", early_command_line);

18
arch/s390/boot/printk.c
View File

@ -32,6 +32,24 @@ static void boot_rb_add(const char *str, size_t len)
boot_rb_off += len + 1;
}
static void print_rb_entry(const char *str)
{
sclp_early_printk(printk_skip_level(str));
}
static bool debug_messages_printed(void)
{
return boot_earlyprintk && (boot_ignore_loglevel || boot_console_loglevel > LOGLEVEL_DEBUG);
}
void boot_rb_dump(void)
{
if (debug_messages_printed())
return;
sclp_early_printk("Boot messages ring buffer:\n");
boot_rb_foreach(print_rb_entry);
}
const char hex_asc[] = "0123456789abcdef";
static char *as_hex(char *dst, unsigned long val, int pad)