diff options
| author | Vasily Gorbik <gor@linux.ibm.com> | 2024-11-21 00:23:48 +0300 |
|---|---|---|
| committer | Alexander Gordeev <agordeev@linux.ibm.com> | 2025-01-26 19:24:01 +0300 |
| commit | d20d8e51338fc39aedf98786a4e9b71d4af4bda7 (patch) | |
| tree | aba7ebf2af9eaa89c6197df6c5d3c610a22897db /arch/s390 | |
| parent | c09f8d0ad673afdfd5d097d95d2026a84fa4926e (diff) | |
| download | linux-d20d8e51338fc39aedf98786a4e9b71d4af4bda7.tar.xz | |
s390/boot: Add bootdebug option to control debug messages
Suppress decompressor debug messages by default, similar to regular
kernel debug messages that require 'DEBUG' or 'dyndbg' to be enabled
(depending on CONFIG_DYNAMIC_DEBUG). Introduce a 'bootdebug' option to
enable printing these messages when needed.
All messages are still stored in the boot ring buffer regardless.
To enable boot debug messages:
bootdebug debug
Or combine with 'earlyprintk' to print them without delay:
bootdebug debug earlyprintk
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>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/boot/ipl_parm.c | 2 | ||||
| -rw-r--r-- | arch/s390/boot/printk.c | 4 | ||||
| -rw-r--r-- | arch/s390/include/asm/boot_data.h | 1 | ||||
| -rw-r--r-- | arch/s390/kernel/early.c | 1 | ||||
| -rw-r--r-- | arch/s390/kernel/setup.c | 10 |
5 files changed, 16 insertions, 2 deletions
diff --git a/arch/s390/boot/ipl_parm.c b/arch/s390/boot/ipl_parm.c index fd4874ab30cb..397046f0c1df 100644 --- a/arch/s390/boot/ipl_parm.c +++ b/arch/s390/boot/ipl_parm.c @@ -317,6 +317,8 @@ void parse_boot_command_line(void) boot_earlyprintk = true; if (!strcmp(param, "debug")) boot_console_loglevel = CONSOLE_LOGLEVEL_DEBUG; + if (!strcmp(param, "bootdebug")) + bootdebug = true; if (!strcmp(param, "quiet")) boot_console_loglevel = CONSOLE_LOGLEVEL_QUIET; if (!strcmp(param, "ignore_loglevel")) diff --git a/arch/s390/boot/printk.c b/arch/s390/boot/printk.c index 7b7203f078c8..4c60245697ab 100644 --- a/arch/s390/boot/printk.c +++ b/arch/s390/boot/printk.c @@ -17,6 +17,7 @@ bool boot_ignore_loglevel; char __bootdata(boot_rb)[PAGE_SIZE * 2]; bool __bootdata(boot_earlyprintk); size_t __bootdata(boot_rb_off); +bool __bootdata(bootdebug); static void boot_rb_add(const char *str, size_t len) { @@ -168,6 +169,9 @@ static void boot_console_earlyprintk(const char *buf) /* always print emergency messages */ if (level > LOGLEVEL_EMERG && !boot_earlyprintk) return; + /* print debug messages only when bootdebug is enabled */ + if (level == LOGLEVEL_DEBUG && !bootdebug) + return; if (boot_ignore_loglevel || level < boot_console_loglevel) sclp_early_printk(printk_skip_level(buf)); } diff --git a/arch/s390/include/asm/boot_data.h b/arch/s390/include/asm/boot_data.h index e7ef7524b847..da5527c50738 100644 --- a/arch/s390/include/asm/boot_data.h +++ b/arch/s390/include/asm/boot_data.h @@ -18,6 +18,7 @@ extern unsigned long early_ipl_comp_list_size; extern char boot_rb[PAGE_SIZE * 2]; extern bool boot_earlyprintk; extern size_t boot_rb_off; +extern bool bootdebug; #define boot_rb_foreach(cb) \ do { \ diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index 62f8f5a750a3..4cdf3bf33052 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -50,6 +50,7 @@ decompressor_handled_param(facilities); decompressor_handled_param(nokaslr); decompressor_handled_param(cmma); decompressor_handled_param(relocate_lowcore); +decompressor_handled_param(bootdebug); #if IS_ENABLED(CONFIG_KVM) decompressor_handled_param(prot_virt); #endif diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index feff1bb9ac2d..dd0979182890 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -160,6 +160,7 @@ struct oldmem_data __bootdata_preserved(oldmem_data); char __bootdata(boot_rb)[PAGE_SIZE * 2]; bool __bootdata(boot_earlyprintk); size_t __bootdata(boot_rb_off); +bool __bootdata(bootdebug); unsigned long __bootdata_preserved(VMALLOC_START); EXPORT_SYMBOL(VMALLOC_START); @@ -882,13 +883,18 @@ static void __init log_component_list(void) } /* - * Print avoiding interpretation of % in buf + * Print avoiding interpretation of % in buf and taking bootdebug option + * into consideration. */ static void __init print_rb_entry(char *buf) { char fmt[] = KERN_SOH "0boot: %s"; + int level = printk_get_level(buf); - fmt[1] = printk_get_level(buf); + if (level == KERN_DEBUG[1] && !bootdebug) + return; + + fmt[1] = level; printk(fmt, printk_skip_level(buf)); } |