diff options
| author | Vasily Gorbik <gor@linux.ibm.com> | 2024-11-20 20:30:10 +0100 |
|---|---|---|
| committer | Alexander Gordeev <agordeev@linux.ibm.com> | 2025-01-26 17:24:01 +0100 |
| commit | b2a992a55fb60395d1ab9a4d4b2ea3783e3b7ad9 (patch) | |
| tree | d52538b2f5ed430b5721e63ff105cbf4041c1dc9 | |
| parent | b79015ae63d3c91f06ab78b6f06abba94fd88e12 (diff) | |
s390/boot: Dump message ring buffer on crash with bootdebug
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>
| -rw-r--r-- | arch/s390/boot/boot.h | 1 | ||||
| -rw-r--r-- | arch/s390/boot/pgm_check_info.c | 2 | ||||
| -rw-r--r-- | arch/s390/boot/printk.c | 18 |
3 files changed, 21 insertions, 0 deletions
diff --git a/arch/s390/boot/boot.h b/arch/s390/boot/boot.h index 688fa75f8651..0cfa84a42ec1 100644 --- a/arch/s390/boot/boot.h +++ b/arch/s390/boot/boot.h @@ -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 diff --git a/arch/s390/boot/pgm_check_info.c b/arch/s390/boot/pgm_check_info.c index e8a728c3db05..633f11600aab 100644 --- a/arch/s390/boot/pgm_check_info.c +++ b/arch/s390/boot/pgm_check_info.c @@ -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); diff --git a/arch/s390/boot/printk.c b/arch/s390/boot/printk.c index 092114e46937..abfa05cf9562 100644 --- a/arch/s390/boot/printk.c +++ b/arch/s390/boot/printk.c @@ -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) |