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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __KERNEL_PRINTK__
3#define __KERNEL_PRINTK__
4
5#include <linux/stdarg.h>
6#include <linux/init.h>
7#include <linux/kern_levels.h>
8#include <linux/linkage.h>
9#include <linux/ratelimit_types.h>
10#include <linux/once_lite.h>
11
12struct console;
13
14extern const char linux_banner[];
15extern const char linux_proc_banner[];
16
17extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
18
19#define PRINTK_MAX_SINGLE_HEADER_LEN 2
20
21static inline int printk_get_level(const char *buffer)
22{
23 if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
24 switch (buffer[1]) {
25 case '0' ... '7':
26 case 'c': /* KERN_CONT */
27 return buffer[1];
28 }
29 }
30 return 0;
31}
32
33static inline const char *printk_skip_level(const char *buffer)
34{
35 if (printk_get_level(buffer))
36 return buffer + 2;
37
38 return buffer;
39}
40
41static inline const char *printk_skip_headers(const char *buffer)
42{
43 while (printk_get_level(buffer))
44 buffer = printk_skip_level(buffer);
45
46 return buffer;
47}
48
49/* printk's without a loglevel use this.. */
50#define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT
51
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 */
57
58/*
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.
61 */
62#define CONSOLE_LOGLEVEL_DEFAULT CONFIG_CONSOLE_LOGLEVEL_DEFAULT
63#define CONSOLE_LOGLEVEL_QUIET CONFIG_CONSOLE_LOGLEVEL_QUIET
64
65int match_devname_and_update_preferred_console(const char *match,
66 const char *name,
67 const short idx);
68
69extern int console_printk[];
70
71#define console_loglevel (console_printk[0])
72#define default_message_loglevel (console_printk[1])
73#define minimum_console_loglevel (console_printk[2])
74#define default_console_loglevel (console_printk[3])
75
76extern void console_verbose(void);
77
78/* strlen("ratelimit") + 1 */
79#define DEVKMSG_STR_MAX_SIZE 10
80extern char devkmsg_log_str[DEVKMSG_STR_MAX_SIZE];
81struct ctl_table;
82
83extern int suppress_printk;
84
85struct va_format {
86 const char *fmt;
87 va_list *va;
88};
89
90/*
91 * FW_BUG
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
96 * code.
97 *
98 * Use it for definite and high priority BIOS bugs.
99 *
100 * FW_WARN
101 * Use it for not that clear (e.g. could the kernel messed up things already?)
102 * and medium priority BIOS bugs.
103 *
104 * FW_INFO
105 * Use this one if you want to tell the user or vendor about something
106 * suspicious, but generally harmless related to the firmware.
107 *
108 * Use it for information or very low priority BIOS bugs.
109 */
110#define FW_BUG "[Firmware Bug]: "
111#define FW_WARN "[Firmware Warn]: "
112#define FW_INFO "[Firmware Info]: "
113
114/*
115 * HW_ERR
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.
118 */
119#define HW_ERR "[Hardware Error]: "
120
121/*
122 * DEPRECATED
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
125 */
126#define DEPRECATED "[Deprecated]: "
127
128/*
129 * Dummy printk for disabled debugging statements to use whilst maintaining
130 * gcc's format checking.
131 */
132#define no_printk(fmt, ...) \
133({ \
134 if (0) \
135 _printk(fmt, ##__VA_ARGS__); \
136 0; \
137})
138
139#ifdef CONFIG_EARLY_PRINTK
140extern asmlinkage __printf(1, 2)
141void early_printk(const char *fmt, ...);
142#else
143static inline __printf(1, 2) __cold
144void early_printk(const char *s, ...) { }
145#endif
146
147struct dev_printk_info;
148
149#ifdef CONFIG_PRINTK
150asmlinkage __printf(4, 0)
151int vprintk_emit(int facility, int level,
152 const struct dev_printk_info *dev_info,
153 const char *fmt, va_list args);
154
155asmlinkage __printf(1, 0)
156int vprintk(const char *fmt, va_list args);
157__printf(1, 0)
158int vprintk_deferred(const char *fmt, va_list args);
159
160asmlinkage __printf(1, 2) __cold
161int _printk(const char *fmt, ...);
162
163/*
164 * Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !
165 */
166__printf(1, 2) __cold int _printk_deferred(const char *fmt, ...);
167
168extern void __printk_deferred_enter(void);
169extern void __printk_deferred_exit(void);
170
171extern void printk_force_console_enter(void);
172extern void printk_force_console_exit(void);
173
174/*
175 * The printk_deferred_enter/exit macros are available only as a hack for
176 * some code paths that need to defer all printk console printing. Interrupts
177 * must be disabled for the deferred duration.
178 */
179#define printk_deferred_enter() __printk_deferred_enter()
180#define printk_deferred_exit() __printk_deferred_exit()
181
182/*
183 * Please don't use printk_ratelimit(), because it shares ratelimiting state
184 * with all other unrelated printk_ratelimit() callsites. Instead use
185 * printk_ratelimited() or plain old __ratelimit().
186 */
187extern int __printk_ratelimit(const char *func);
188#define printk_ratelimit() __printk_ratelimit(__func__)
189extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
190 unsigned int interval_msec);
191
192extern int printk_delay_msec;
193extern int dmesg_restrict;
194
195extern void wake_up_klogd(void);
196
197char *log_buf_addr_get(void);
198u32 log_buf_len_get(void);
199void log_buf_vmcoreinfo_setup(void);
200void __init setup_log_buf(int early);
201__printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
202void dump_stack_print_info(const char *log_lvl);
203void show_regs_print_info(const char *log_lvl);
204extern asmlinkage void dump_stack_lvl(const char *log_lvl) __cold;
205extern asmlinkage void dump_stack(void) __cold;
206void printk_trigger_flush(void);
207void console_try_replay_all(void);
208void printk_legacy_allow_panic_sync(void);
209extern bool nbcon_device_try_acquire(struct console *con);
210extern void nbcon_device_release(struct console *con);
211void nbcon_atomic_flush_unsafe(void);
212bool pr_flush(int timeout_ms, bool reset_on_progress);
213#else
214static inline __printf(1, 0)
215int vprintk(const char *s, va_list args)
216{
217 return 0;
218}
219static inline __printf(1, 0)
220int vprintk_deferred(const char *fmt, va_list args)
221{
222 return 0;
223}
224static inline __printf(1, 2) __cold
225int _printk(const char *s, ...)
226{
227 return 0;
228}
229static inline __printf(1, 2) __cold
230int _printk_deferred(const char *s, ...)
231{
232 return 0;
233}
234
235static inline void printk_deferred_enter(void)
236{
237}
238
239static inline void printk_deferred_exit(void)
240{
241}
242
243static inline void printk_force_console_enter(void)
244{
245}
246
247static inline void printk_force_console_exit(void)
248{
249}
250
251static inline int printk_ratelimit(void)
252{
253 return 0;
254}
255static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
256 unsigned int interval_msec)
257{
258 return false;
259}
260
261static inline void wake_up_klogd(void)
262{
263}
264
265static inline char *log_buf_addr_get(void)
266{
267 return NULL;
268}
269
270static inline u32 log_buf_len_get(void)
271{
272 return 0;
273}
274
275static inline void log_buf_vmcoreinfo_setup(void)
276{
277}
278
279static inline void setup_log_buf(int early)
280{
281}
282
283static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
284{
285}
286
287static inline void dump_stack_print_info(const char *log_lvl)
288{
289}
290
291static inline void show_regs_print_info(const char *log_lvl)
292{
293}
294
295static inline void dump_stack_lvl(const char *log_lvl)
296{
297}
298
299static inline void dump_stack(void)
300{
301}
302static inline void printk_trigger_flush(void)
303{
304}
305static inline void console_try_replay_all(void)
306{
307}
308
309static inline void printk_legacy_allow_panic_sync(void)
310{
311}
312
313static inline bool nbcon_device_try_acquire(struct console *con)
314{
315 return false;
316}
317
318static inline void nbcon_device_release(struct console *con)
319{
320}
321
322static inline void nbcon_atomic_flush_unsafe(void)
323{
324}
325
326static inline bool pr_flush(int timeout_ms, bool reset_on_progress)
327{
328 return true;
329}
330
331#endif
332
333#ifdef CONFIG_SMP
334extern int __printk_cpu_sync_try_get(void);
335extern void __printk_cpu_sync_wait(void);
336extern void __printk_cpu_sync_put(void);
337
338#else
339
340#define __printk_cpu_sync_try_get() true
341#define __printk_cpu_sync_wait()
342#define __printk_cpu_sync_put()
343#endif /* CONFIG_SMP */
344
345/**
346 * printk_cpu_sync_get_irqsave() - Disable interrupts and acquire the printk
347 * cpu-reentrant spinning lock.
348 * @flags: Stack-allocated storage for saving local interrupt state,
349 * to be passed to printk_cpu_sync_put_irqrestore().
350 *
351 * If the lock is owned by another CPU, spin until it becomes available.
352 * Interrupts are restored while spinning.
353 *
354 * CAUTION: This function must be used carefully. It does not behave like a
355 * typical lock. Here are important things to watch out for...
356 *
357 * * This function is reentrant on the same CPU. Therefore the calling
358 * code must not assume exclusive access to data if code accessing the
359 * data can run reentrant or within NMI context on the same CPU.
360 *
361 * * If there exists usage of this function from NMI context, it becomes
362 * unsafe to perform any type of locking or spinning to wait for other
363 * CPUs after calling this function from any context. This includes
364 * using spinlocks or any other busy-waiting synchronization methods.
365 */
366#define printk_cpu_sync_get_irqsave(flags) \
367 for (;;) { \
368 local_irq_save(flags); \
369 if (__printk_cpu_sync_try_get()) \
370 break; \
371 local_irq_restore(flags); \
372 __printk_cpu_sync_wait(); \
373 }
374
375/**
376 * printk_cpu_sync_put_irqrestore() - Release the printk cpu-reentrant spinning
377 * lock and restore interrupts.
378 * @flags: Caller's saved interrupt state, from printk_cpu_sync_get_irqsave().
379 */
380#define printk_cpu_sync_put_irqrestore(flags) \
381 do { \
382 __printk_cpu_sync_put(); \
383 local_irq_restore(flags); \
384 } while (0)
385
386extern int kptr_restrict;
387
388/**
389 * pr_fmt - used by the pr_*() macros to generate the printk format string
390 * @fmt: format string passed from a pr_*() macro
391 *
392 * This macro can be used to generate a unified format string for pr_*()
393 * macros. A common use is to prefix all pr_*() messages in a file with a common
394 * string. For example, defining this at the top of a source file:
395 *
396 * #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
397 *
398 * would prefix all pr_info, pr_emerg... messages in the file with the module
399 * name.
400 */
401#ifndef pr_fmt
402#define pr_fmt(fmt) fmt
403#endif
404
405struct module;
406
407#ifdef CONFIG_PRINTK_INDEX
408struct pi_entry {
409 const char *fmt;
410 const char *func;
411 const char *file;
412 unsigned int line;
413
414 /*
415 * While printk and pr_* have the level stored in the string at compile
416 * time, some subsystems dynamically add it at runtime through the
417 * format string. For these dynamic cases, we allow the subsystem to
418 * tell us the level at compile time.
419 *
420 * NULL indicates that the level, if any, is stored in fmt.
421 */
422 const char *level;
423
424 /*
425 * The format string used by various subsystem specific printk()
426 * wrappers to prefix the message.
427 *
428 * Note that the static prefix defined by the pr_fmt() macro is stored
429 * directly in the message format (@fmt), not here.
430 */
431 const char *subsys_fmt_prefix;
432} __packed;
433
434#define __printk_index_emit(_fmt, _level, _subsys_fmt_prefix) \
435 do { \
436 if (__builtin_constant_p(_fmt) && __builtin_constant_p(_level)) { \
437 /*
438 * We check __builtin_constant_p multiple times here
439 * for the same input because GCC will produce an error
440 * if we try to assign a static variable to fmt if it
441 * is not a constant, even with the outer if statement.
442 */ \
443 static const struct pi_entry _entry \
444 __used = { \
445 .fmt = __builtin_constant_p(_fmt) ? (_fmt) : NULL, \
446 .func = __func__, \
447 .file = __FILE__, \
448 .line = __LINE__, \
449 .level = __builtin_constant_p(_level) ? (_level) : NULL, \
450 .subsys_fmt_prefix = _subsys_fmt_prefix,\
451 }; \
452 static const struct pi_entry *_entry_ptr \
453 __used __section(".printk_index") = &_entry; \
454 } \
455 } while (0)
456
457#else /* !CONFIG_PRINTK_INDEX */
458#define __printk_index_emit(...) do {} while (0)
459#endif /* CONFIG_PRINTK_INDEX */
460
461/*
462 * Some subsystems have their own custom printk that applies a va_format to a
463 * generic format, for example, to include a device number or other metadata
464 * alongside the format supplied by the caller.
465 *
466 * In order to store these in the way they would be emitted by the printk
467 * infrastructure, the subsystem provides us with the start, fixed string, and
468 * any subsequent text in the format string.
469 *
470 * We take a variable argument list as pr_fmt/dev_fmt/etc are sometimes passed
471 * as multiple arguments (eg: `"%s: ", "blah"`), and we must only take the
472 * first one.
473 *
474 * subsys_fmt_prefix must be known at compile time, or compilation will fail
475 * (since this is a mistake). If fmt or level is not known at compile time, no
476 * index entry will be made (since this can legitimately happen).
477 */
478#define printk_index_subsys_emit(subsys_fmt_prefix, level, fmt, ...) \
479 __printk_index_emit(fmt, level, subsys_fmt_prefix)
480
481#define printk_index_wrap(_p_func, _fmt, ...) \
482 ({ \
483 __printk_index_emit(_fmt, NULL, NULL); \
484 _p_func(_fmt, ##__VA_ARGS__); \
485 })
486
487
488/**
489 * printk - print a kernel message
490 * @fmt: format string
491 *
492 * This is printk(). It can be called from any context. We want it to work.
493 *
494 * If printk indexing is enabled, _printk() is called from printk_index_wrap.
495 * Otherwise, printk is simply #defined to _printk.
496 *
497 * We try to grab the console_lock. If we succeed, it's easy - we log the
498 * output and call the console drivers. If we fail to get the semaphore, we
499 * place the output into the log buffer and return. The current holder of
500 * the console_sem will notice the new output in console_unlock(); and will
501 * send it to the consoles before releasing the lock.
502 *
503 * One effect of this deferred printing is that code which calls printk() and
504 * then changes console_loglevel may break. This is because console_loglevel
505 * is inspected when the actual printing occurs.
506 *
507 * See also:
508 * printf(3)
509 *
510 * See the vsnprintf() documentation for format string extensions over C99.
511 */
512#define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
513#define printk_deferred(fmt, ...) \
514 printk_index_wrap(_printk_deferred, fmt, ##__VA_ARGS__)
515
516/**
517 * pr_emerg - Print an emergency-level message
518 * @fmt: format string
519 * @...: arguments for the format string
520 *
521 * This macro expands to a printk with KERN_EMERG loglevel. It uses pr_fmt() to
522 * generate the format string.
523 */
524#define pr_emerg(fmt, ...) \
525 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
526/**
527 * pr_alert - Print an alert-level message
528 * @fmt: format string
529 * @...: arguments for the format string
530 *
531 * This macro expands to a printk with KERN_ALERT loglevel. It uses pr_fmt() to
532 * generate the format string.
533 */
534#define pr_alert(fmt, ...) \
535 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
536/**
537 * pr_crit - Print a critical-level message
538 * @fmt: format string
539 * @...: arguments for the format string
540 *
541 * This macro expands to a printk with KERN_CRIT loglevel. It uses pr_fmt() to
542 * generate the format string.
543 */
544#define pr_crit(fmt, ...) \
545 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
546/**
547 * pr_err - Print an error-level message
548 * @fmt: format string
549 * @...: arguments for the format string
550 *
551 * This macro expands to a printk with KERN_ERR loglevel. It uses pr_fmt() to
552 * generate the format string.
553 */
554#define pr_err(fmt, ...) \
555 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
556/**
557 * pr_warn - Print a warning-level message
558 * @fmt: format string
559 * @...: arguments for the format string
560 *
561 * This macro expands to a printk with KERN_WARNING loglevel. It uses pr_fmt()
562 * to generate the format string.
563 */
564#define pr_warn(fmt, ...) \
565 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
566/**
567 * pr_notice - Print a notice-level message
568 * @fmt: format string
569 * @...: arguments for the format string
570 *
571 * This macro expands to a printk with KERN_NOTICE loglevel. It uses pr_fmt() to
572 * generate the format string.
573 */
574#define pr_notice(fmt, ...) \
575 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
576/**
577 * pr_info - Print an info-level message
578 * @fmt: format string
579 * @...: arguments for the format string
580 *
581 * This macro expands to a printk with KERN_INFO loglevel. It uses pr_fmt() to
582 * generate the format string.
583 */
584#define pr_info(fmt, ...) \
585 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
586
587/**
588 * pr_cont - Continues a previous log message in the same line.
589 * @fmt: format string
590 * @...: arguments for the format string
591 *
592 * This macro expands to a printk with KERN_CONT loglevel. It should only be
593 * used when continuing a log message with no newline ('\n') enclosed. Otherwise
594 * it defaults back to KERN_DEFAULT loglevel.
595 */
596#define pr_cont(fmt, ...) \
597 printk(KERN_CONT fmt, ##__VA_ARGS__)
598
599/**
600 * pr_devel - Print a debug-level message conditionally
601 * @fmt: format string
602 * @...: arguments for the format string
603 *
604 * This macro expands to a printk with KERN_DEBUG loglevel if DEBUG is
605 * defined. Otherwise it does nothing.
606 *
607 * It uses pr_fmt() to generate the format string.
608 */
609#ifdef DEBUG
610#define pr_devel(fmt, ...) \
611 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
612#else
613#define pr_devel(fmt, ...) \
614 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
615#endif
616
617
618/* If you are writing a driver, please use dev_dbg instead */
619#if defined(CONFIG_DYNAMIC_DEBUG) || \
620 (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
621#include <linux/dynamic_debug.h>
622
623/**
624 * pr_debug - Print a debug-level message conditionally
625 * @fmt: format string
626 * @...: arguments for the format string
627 *
628 * This macro expands to dynamic_pr_debug() if CONFIG_DYNAMIC_DEBUG is
629 * set. Otherwise, if DEBUG is defined, it's equivalent to a printk with
630 * KERN_DEBUG loglevel. If DEBUG is not defined it does nothing.
631 *
632 * It uses pr_fmt() to generate the format string (dynamic_pr_debug() uses
633 * pr_fmt() internally).
634 */
635#define pr_debug(fmt, ...) \
636 dynamic_pr_debug(fmt, ##__VA_ARGS__)
637#elif defined(DEBUG)
638#define pr_debug(fmt, ...) \
639 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
640#else
641#define pr_debug(fmt, ...) \
642 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
643#endif
644
645/*
646 * Print a one-time message (analogous to WARN_ONCE() et al):
647 */
648
649#ifdef CONFIG_PRINTK
650#define printk_once(fmt, ...) \
651 DO_ONCE_LITE(printk, fmt, ##__VA_ARGS__)
652#define printk_deferred_once(fmt, ...) \
653 DO_ONCE_LITE(printk_deferred, fmt, ##__VA_ARGS__)
654#else
655#define printk_once(fmt, ...) \
656 no_printk(fmt, ##__VA_ARGS__)
657#define printk_deferred_once(fmt, ...) \
658 no_printk(fmt, ##__VA_ARGS__)
659#endif
660
661#define pr_emerg_once(fmt, ...) \
662 printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
663#define pr_alert_once(fmt, ...) \
664 printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
665#define pr_crit_once(fmt, ...) \
666 printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
667#define pr_err_once(fmt, ...) \
668 printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
669#define pr_warn_once(fmt, ...) \
670 printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
671#define pr_notice_once(fmt, ...) \
672 printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
673#define pr_info_once(fmt, ...) \
674 printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
675/* no pr_cont_once, don't do that... */
676
677#if defined(DEBUG)
678#define pr_devel_once(fmt, ...) \
679 printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
680#else
681#define pr_devel_once(fmt, ...) \
682 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
683#endif
684
685/* If you are writing a driver, please use dev_dbg instead */
686#if defined(DEBUG)
687#define pr_debug_once(fmt, ...) \
688 printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
689#else
690#define pr_debug_once(fmt, ...) \
691 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
692#endif
693
694/*
695 * ratelimited messages with local ratelimit_state,
696 * no local ratelimit_state used in the !PRINTK case
697 */
698#ifdef CONFIG_PRINTK
699#define printk_ratelimited(fmt, ...) \
700({ \
701 static DEFINE_RATELIMIT_STATE(_rs, \
702 DEFAULT_RATELIMIT_INTERVAL, \
703 DEFAULT_RATELIMIT_BURST); \
704 \
705 if (__ratelimit(&_rs)) \
706 printk(fmt, ##__VA_ARGS__); \
707})
708#else
709#define printk_ratelimited(fmt, ...) \
710 no_printk(fmt, ##__VA_ARGS__)
711#endif
712
713#define pr_emerg_ratelimited(fmt, ...) \
714 printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
715#define pr_alert_ratelimited(fmt, ...) \
716 printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
717#define pr_crit_ratelimited(fmt, ...) \
718 printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
719#define pr_err_ratelimited(fmt, ...) \
720 printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
721#define pr_warn_ratelimited(fmt, ...) \
722 printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
723#define pr_notice_ratelimited(fmt, ...) \
724 printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
725#define pr_info_ratelimited(fmt, ...) \
726 printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
727/* no pr_cont_ratelimited, don't do that... */
728
729#if defined(DEBUG)
730#define pr_devel_ratelimited(fmt, ...) \
731 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
732#else
733#define pr_devel_ratelimited(fmt, ...) \
734 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
735#endif
736
737/* If you are writing a driver, please use dev_dbg instead */
738#if defined(CONFIG_DYNAMIC_DEBUG) || \
739 (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
740/* descriptor check is first to prevent flooding with "callbacks suppressed" */
741#define pr_debug_ratelimited(fmt, ...) \
742do { \
743 static DEFINE_RATELIMIT_STATE(_rs, \
744 DEFAULT_RATELIMIT_INTERVAL, \
745 DEFAULT_RATELIMIT_BURST); \
746 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt)); \
747 if (DYNAMIC_DEBUG_BRANCH(descriptor) && \
748 __ratelimit(&_rs)) \
749 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__); \
750} while (0)
751#elif defined(DEBUG)
752#define pr_debug_ratelimited(fmt, ...) \
753 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
754#else
755#define pr_debug_ratelimited(fmt, ...) \
756 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
757#endif
758
759extern const struct file_operations kmsg_fops;
760
761enum {
762 DUMP_PREFIX_NONE,
763 DUMP_PREFIX_ADDRESS,
764 DUMP_PREFIX_OFFSET
765};
766extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
767 int groupsize, char *linebuf, size_t linebuflen,
768 bool ascii);
769#ifdef CONFIG_PRINTK
770extern void print_hex_dump(const char *level, const char *prefix_str,
771 int prefix_type, int rowsize, int groupsize,
772 const void *buf, size_t len, bool ascii);
773#else
774static inline void print_hex_dump(const char *level, const char *prefix_str,
775 int prefix_type, int rowsize, int groupsize,
776 const void *buf, size_t len, bool ascii)
777{
778}
779static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
780 const void *buf, size_t len)
781{
782}
783
784#endif
785
786#if defined(CONFIG_DYNAMIC_DEBUG) || \
787 (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
788#define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
789 groupsize, buf, len, ascii) \
790 dynamic_hex_dump(prefix_str, prefix_type, rowsize, \
791 groupsize, buf, len, ascii)
792#elif defined(DEBUG)
793#define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
794 groupsize, buf, len, ascii) \
795 print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize, \
796 groupsize, buf, len, ascii)
797#else
798static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
799 int rowsize, int groupsize,
800 const void *buf, size_t len, bool ascii)
801{
802}
803#endif
804
805/**
806 * print_hex_dump_bytes - shorthand form of print_hex_dump() with default params
807 * @prefix_str: string to prefix each line with;
808 * caller supplies trailing spaces for alignment if desired
809 * @prefix_type: controls whether prefix of an offset, address, or none
810 * is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
811 * @buf: data blob to dump
812 * @len: number of bytes in the @buf
813 *
814 * Calls print_hex_dump(), with log level of KERN_DEBUG,
815 * rowsize of 16, groupsize of 1, and ASCII output included.
816 */
817#define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
818 print_hex_dump_debug(prefix_str, prefix_type, 16, 1, buf, len, true)
819
820#endif
821

source code of linux/include/linux/printk.h