1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __KERNEL_PRINTK__
3 #define __KERNEL_PRINTK__
6 #include <linux/init.h>
7 #include <linux/kern_levels.h>
8 #include <linux/linkage.h>
9 #include <linux/cache.h>
10 #include <linux/ratelimit_types.h>
12 extern const char linux_banner[];
13 extern const char linux_proc_banner[];
15 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
17 #define PRINTK_MAX_SINGLE_HEADER_LEN 2
19 static inline int printk_get_level(const char *buffer)
21 if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
24 case 'c': /* KERN_CONT */
31 static inline const char *printk_skip_level(const char *buffer)
33 if (printk_get_level(buffer))
39 static inline const char *printk_skip_headers(const char *buffer)
41 while (printk_get_level(buffer))
42 buffer = printk_skip_level(buffer);
47 #define CONSOLE_EXT_LOG_MAX 8192
49 /* printk's without a loglevel use this.. */
50 #define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT
52 /* We show everything that is MORE important than this.. */
53 #define CONSOLE_LOGLEVEL_SILENT 0 /* Mum's the word */
54 #define CONSOLE_LOGLEVEL_MIN 1 /* Minimum loglevel we let people use */
55 #define CONSOLE_LOGLEVEL_DEBUG 10 /* issue debug messages */
56 #define CONSOLE_LOGLEVEL_MOTORMOUTH 15 /* You can't shut this one up */
59 * Default used to be hard-coded at 7, quiet used to be hardcoded at 4,
60 * we're now allowing both to be set from kernel config.
62 #define CONSOLE_LOGLEVEL_DEFAULT CONFIG_CONSOLE_LOGLEVEL_DEFAULT
63 #define CONSOLE_LOGLEVEL_QUIET CONFIG_CONSOLE_LOGLEVEL_QUIET
65 extern int console_printk[];
67 #define console_loglevel (console_printk[0])
68 #define default_message_loglevel (console_printk[1])
69 #define minimum_console_loglevel (console_printk[2])
70 #define default_console_loglevel (console_printk[3])
72 static inline void console_verbose(void)
75 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
78 /* strlen("ratelimit") + 1 */
79 #define DEVKMSG_STR_MAX_SIZE 10
80 extern char devkmsg_log_str[];
83 extern int suppress_printk;
92 * Add this to a message where you are sure the firmware is buggy or behaves
93 * really stupid or out of spec. Be aware that the responsible BIOS developer
94 * should be able to fix this issue or at least get a concrete idea of the
95 * problem by reading your message without the need of looking at the kernel
98 * Use it for definite and high priority BIOS bugs.
101 * Use it for not that clear (e.g. could the kernel messed up things already?)
102 * and medium priority BIOS bugs.
105 * Use this one if you want to tell the user or vendor about something
106 * suspicious, but generally harmless related to the firmware.
108 * Use it for information or very low priority BIOS bugs.
110 #define FW_BUG "[Firmware Bug]: "
111 #define FW_WARN "[Firmware Warn]: "
112 #define FW_INFO "[Firmware Info]: "
116 * Add this to a message for hardware errors, so that user can report
117 * it to hardware vendor instead of LKML or software vendor.
119 #define HW_ERR "[Hardware Error]: "
123 * Add this to a message whenever you want to warn user space about the use
124 * of a deprecated aspect of an API so they can stop using it
126 #define DEPRECATED "[Deprecated]: "
129 * Dummy printk for disabled debugging statements to use whilst maintaining
130 * gcc's format checking.
132 #define no_printk(fmt, ...) \
135 printk(fmt, ##__VA_ARGS__); \
139 #ifdef CONFIG_EARLY_PRINTK
140 extern asmlinkage __printf(1, 2)
141 void early_printk(const char *fmt, ...);
143 static inline __printf(1, 2) __cold
144 void early_printk(const char *s, ...) { }
147 #ifdef CONFIG_PRINTK_NMI
148 extern void printk_nmi_enter(void);
149 extern void printk_nmi_exit(void);
150 extern void printk_nmi_direct_enter(void);
151 extern void printk_nmi_direct_exit(void);
153 static inline void printk_nmi_enter(void) { }
154 static inline void printk_nmi_exit(void) { }
155 static inline void printk_nmi_direct_enter(void) { }
156 static inline void printk_nmi_direct_exit(void) { }
157 #endif /* PRINTK_NMI */
159 struct dev_printk_info;
162 asmlinkage __printf(4, 0)
163 int vprintk_emit(int facility, int level,
164 const struct dev_printk_info *dev_info,
165 const char *fmt, va_list args);
167 asmlinkage __printf(1, 0)
168 int vprintk(const char *fmt, va_list args);
170 asmlinkage __printf(1, 2) __cold
171 int printk(const char *fmt, ...);
174 * Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !
176 __printf(1, 2) __cold int printk_deferred(const char *fmt, ...);
179 * Please don't use printk_ratelimit(), because it shares ratelimiting state
180 * with all other unrelated printk_ratelimit() callsites. Instead use
181 * printk_ratelimited() or plain old __ratelimit().
183 extern int __printk_ratelimit(const char *func);
184 #define printk_ratelimit() __printk_ratelimit(__func__)
185 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
186 unsigned int interval_msec);
188 extern int printk_delay_msec;
189 extern int dmesg_restrict;
192 devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, void *buf,
193 size_t *lenp, loff_t *ppos);
195 extern void wake_up_klogd(void);
197 char *log_buf_addr_get(void);
198 u32 log_buf_len_get(void);
199 void log_buf_vmcoreinfo_setup(void);
200 void __init setup_log_buf(int early);
201 __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
202 void dump_stack_print_info(const char *log_lvl);
203 void show_regs_print_info(const char *log_lvl);
204 extern asmlinkage void dump_stack(void) __cold;
205 extern void printk_safe_flush(void);
206 extern void printk_safe_flush_on_panic(void);
208 static inline __printf(1, 0)
209 int vprintk(const char *s, va_list args)
213 static inline __printf(1, 2) __cold
214 int printk(const char *s, ...)
218 static inline __printf(1, 2) __cold
219 int printk_deferred(const char *s, ...)
223 static inline int printk_ratelimit(void)
227 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
228 unsigned int interval_msec)
233 static inline void wake_up_klogd(void)
237 static inline char *log_buf_addr_get(void)
242 static inline u32 log_buf_len_get(void)
247 static inline void log_buf_vmcoreinfo_setup(void)
251 static inline void setup_log_buf(int early)
255 static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
259 static inline void dump_stack_print_info(const char *log_lvl)
263 static inline void show_regs_print_info(const char *log_lvl)
267 static inline void dump_stack(void)
271 static inline void printk_safe_flush(void)
275 static inline void printk_safe_flush_on_panic(void)
281 extern int __printk_cpu_trylock(void);
282 extern void __printk_wait_on_cpu_lock(void);
283 extern void __printk_cpu_unlock(void);
286 * printk_cpu_lock_irqsave() - Acquire the printk cpu-reentrant spinning
287 * lock and disable interrupts.
288 * @flags: Stack-allocated storage for saving local interrupt state,
289 * to be passed to printk_cpu_unlock_irqrestore().
291 * If the lock is owned by another CPU, spin until it becomes available.
292 * Interrupts are restored while spinning.
294 #define printk_cpu_lock_irqsave(flags) \
296 local_irq_save(flags); \
297 if (__printk_cpu_trylock()) \
299 local_irq_restore(flags); \
300 __printk_wait_on_cpu_lock(); \
304 * printk_cpu_unlock_irqrestore() - Release the printk cpu-reentrant spinning
305 * lock and restore interrupts.
306 * @flags: Caller's saved interrupt state, from printk_cpu_lock_irqsave().
308 #define printk_cpu_unlock_irqrestore(flags) \
310 __printk_cpu_unlock(); \
311 local_irq_restore(flags); \
316 #define printk_cpu_lock_irqsave(flags) ((void)flags)
317 #define printk_cpu_unlock_irqrestore(flags) ((void)flags)
319 #endif /* CONFIG_SMP */
321 extern int kptr_restrict;
324 * pr_fmt - used by the pr_*() macros to generate the printk format string
325 * @fmt: format string passed from a pr_*() macro
327 * This macro can be used to generate a unified format string for pr_*()
328 * macros. A common use is to prefix all pr_*() messages in a file with a common
329 * string. For example, defining this at the top of a source file:
331 * #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
333 * would prefix all pr_info, pr_emerg... messages in the file with the module
337 #define pr_fmt(fmt) fmt
341 * pr_emerg - Print an emergency-level message
342 * @fmt: format string
343 * @...: arguments for the format string
345 * This macro expands to a printk with KERN_EMERG loglevel. It uses pr_fmt() to
346 * generate the format string.
348 #define pr_emerg(fmt, ...) \
349 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
351 * pr_alert - Print an alert-level message
352 * @fmt: format string
353 * @...: arguments for the format string
355 * This macro expands to a printk with KERN_ALERT loglevel. It uses pr_fmt() to
356 * generate the format string.
358 #define pr_alert(fmt, ...) \
359 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
361 * pr_crit - Print a critical-level message
362 * @fmt: format string
363 * @...: arguments for the format string
365 * This macro expands to a printk with KERN_CRIT loglevel. It uses pr_fmt() to
366 * generate the format string.
368 #define pr_crit(fmt, ...) \
369 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
371 * pr_err - Print an error-level message
372 * @fmt: format string
373 * @...: arguments for the format string
375 * This macro expands to a printk with KERN_ERR loglevel. It uses pr_fmt() to
376 * generate the format string.
378 #define pr_err(fmt, ...) \
379 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
381 * pr_warn - Print a warning-level message
382 * @fmt: format string
383 * @...: arguments for the format string
385 * This macro expands to a printk with KERN_WARNING loglevel. It uses pr_fmt()
386 * to generate the format string.
388 #define pr_warn(fmt, ...) \
389 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
391 * pr_notice - Print a notice-level message
392 * @fmt: format string
393 * @...: arguments for the format string
395 * This macro expands to a printk with KERN_NOTICE loglevel. It uses pr_fmt() to
396 * generate the format string.
398 #define pr_notice(fmt, ...) \
399 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
401 * pr_info - Print an info-level message
402 * @fmt: format string
403 * @...: arguments for the format string
405 * This macro expands to a printk with KERN_INFO loglevel. It uses pr_fmt() to
406 * generate the format string.
408 #define pr_info(fmt, ...) \
409 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
412 * pr_cont - Continues a previous log message in the same line.
413 * @fmt: format string
414 * @...: arguments for the format string
416 * This macro expands to a printk with KERN_CONT loglevel. It should only be
417 * used when continuing a log message with no newline ('\n') enclosed. Otherwise
418 * it defaults back to KERN_DEFAULT loglevel.
420 #define pr_cont(fmt, ...) \
421 printk(KERN_CONT fmt, ##__VA_ARGS__)
424 * pr_devel - Print a debug-level message conditionally
425 * @fmt: format string
426 * @...: arguments for the format string
428 * This macro expands to a printk with KERN_DEBUG loglevel if DEBUG is
429 * defined. Otherwise it does nothing.
431 * It uses pr_fmt() to generate the format string.
434 #define pr_devel(fmt, ...) \
435 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
437 #define pr_devel(fmt, ...) \
438 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
442 /* If you are writing a driver, please use dev_dbg instead */
443 #if defined(CONFIG_DYNAMIC_DEBUG) || \
444 (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
445 #include <linux/dynamic_debug.h>
448 * pr_debug - Print a debug-level message conditionally
449 * @fmt: format string
450 * @...: arguments for the format string
452 * This macro expands to dynamic_pr_debug() if CONFIG_DYNAMIC_DEBUG is
453 * set. Otherwise, if DEBUG is defined, it's equivalent to a printk with
454 * KERN_DEBUG loglevel. If DEBUG is not defined it does nothing.
456 * It uses pr_fmt() to generate the format string (dynamic_pr_debug() uses
457 * pr_fmt() internally).
459 #define pr_debug(fmt, ...) \
460 dynamic_pr_debug(fmt, ##__VA_ARGS__)
462 #define pr_debug(fmt, ...) \
463 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
465 #define pr_debug(fmt, ...) \
466 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
470 * Print a one-time message (analogous to WARN_ONCE() et al):
474 #define printk_once(fmt, ...) \
476 static bool __section(".data.once") __print_once; \
477 bool __ret_print_once = !__print_once; \
479 if (!__print_once) { \
480 __print_once = true; \
481 printk(fmt, ##__VA_ARGS__); \
483 unlikely(__ret_print_once); \
485 #define printk_deferred_once(fmt, ...) \
487 static bool __section(".data.once") __print_once; \
488 bool __ret_print_once = !__print_once; \
490 if (!__print_once) { \
491 __print_once = true; \
492 printk_deferred(fmt, ##__VA_ARGS__); \
494 unlikely(__ret_print_once); \
497 #define printk_once(fmt, ...) \
498 no_printk(fmt, ##__VA_ARGS__)
499 #define printk_deferred_once(fmt, ...) \
500 no_printk(fmt, ##__VA_ARGS__)
503 #define pr_emerg_once(fmt, ...) \
504 printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
505 #define pr_alert_once(fmt, ...) \
506 printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
507 #define pr_crit_once(fmt, ...) \
508 printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
509 #define pr_err_once(fmt, ...) \
510 printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
511 #define pr_warn_once(fmt, ...) \
512 printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
513 #define pr_notice_once(fmt, ...) \
514 printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
515 #define pr_info_once(fmt, ...) \
516 printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
517 /* no pr_cont_once, don't do that... */
520 #define pr_devel_once(fmt, ...) \
521 printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
523 #define pr_devel_once(fmt, ...) \
524 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
527 /* If you are writing a driver, please use dev_dbg instead */
529 #define pr_debug_once(fmt, ...) \
530 printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
532 #define pr_debug_once(fmt, ...) \
533 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
537 * ratelimited messages with local ratelimit_state,
538 * no local ratelimit_state used in the !PRINTK case
541 #define printk_ratelimited(fmt, ...) \
543 static DEFINE_RATELIMIT_STATE(_rs, \
544 DEFAULT_RATELIMIT_INTERVAL, \
545 DEFAULT_RATELIMIT_BURST); \
547 if (__ratelimit(&_rs)) \
548 printk(fmt, ##__VA_ARGS__); \
551 #define printk_ratelimited(fmt, ...) \
552 no_printk(fmt, ##__VA_ARGS__)
555 #define pr_emerg_ratelimited(fmt, ...) \
556 printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
557 #define pr_alert_ratelimited(fmt, ...) \
558 printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
559 #define pr_crit_ratelimited(fmt, ...) \
560 printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
561 #define pr_err_ratelimited(fmt, ...) \
562 printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
563 #define pr_warn_ratelimited(fmt, ...) \
564 printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
565 #define pr_notice_ratelimited(fmt, ...) \
566 printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
567 #define pr_info_ratelimited(fmt, ...) \
568 printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
569 /* no pr_cont_ratelimited, don't do that... */
572 #define pr_devel_ratelimited(fmt, ...) \
573 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
575 #define pr_devel_ratelimited(fmt, ...) \
576 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
579 /* If you are writing a driver, please use dev_dbg instead */
580 #if defined(CONFIG_DYNAMIC_DEBUG) || \
581 (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
582 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
583 #define pr_debug_ratelimited(fmt, ...) \
585 static DEFINE_RATELIMIT_STATE(_rs, \
586 DEFAULT_RATELIMIT_INTERVAL, \
587 DEFAULT_RATELIMIT_BURST); \
588 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt)); \
589 if (DYNAMIC_DEBUG_BRANCH(descriptor) && \
591 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__); \
594 #define pr_debug_ratelimited(fmt, ...) \
595 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
597 #define pr_debug_ratelimited(fmt, ...) \
598 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
601 extern const struct file_operations kmsg_fops;
608 extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
609 int groupsize, char *linebuf, size_t linebuflen,
612 extern void print_hex_dump(const char *level, const char *prefix_str,
613 int prefix_type, int rowsize, int groupsize,
614 const void *buf, size_t len, bool ascii);
616 static inline void print_hex_dump(const char *level, const char *prefix_str,
617 int prefix_type, int rowsize, int groupsize,
618 const void *buf, size_t len, bool ascii)
621 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
622 const void *buf, size_t len)
628 #if defined(CONFIG_DYNAMIC_DEBUG) || \
629 (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
630 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
631 groupsize, buf, len, ascii) \
632 dynamic_hex_dump(prefix_str, prefix_type, rowsize, \
633 groupsize, buf, len, ascii)
635 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
636 groupsize, buf, len, ascii) \
637 print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize, \
638 groupsize, buf, len, ascii)
640 static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
641 int rowsize, int groupsize,
642 const void *buf, size_t len, bool ascii)
648 * print_hex_dump_bytes - shorthand form of print_hex_dump() with default params
649 * @prefix_str: string to prefix each line with;
650 * caller supplies trailing spaces for alignment if desired
651 * @prefix_type: controls whether prefix of an offset, address, or none
652 * is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
653 * @buf: data blob to dump
654 * @len: number of bytes in the @buf
656 * Calls print_hex_dump(), with log level of KERN_DEBUG,
657 * rowsize of 16, groupsize of 1, and ASCII output included.
659 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
660 print_hex_dump_debug(prefix_str, prefix_type, 16, 1, buf, len, true)