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
12 struct console;
13
14 extern const char linux_banner[];
15 extern const char linux_proc_banner[];
16
17 extern 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
printk_get_level(const char * buffer)21 static 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
printk_skip_level(const char * buffer)33 static 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
printk_skip_headers(const char * buffer)41 static 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
65 int match_devname_and_update_preferred_console(const char *match,
66 const char *name,
67 const short idx);
68
69 extern 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
76 extern void console_verbose(void);
77
78 /* strlen("ratelimit") + 1 */
79 #define DEVKMSG_STR_MAX_SIZE 10
80 extern char devkmsg_log_str[DEVKMSG_STR_MAX_SIZE];
81
82 extern int suppress_printk;
83
84 struct va_format {
85 const char *fmt;
86 va_list *va;
87 };
88
89 /*
90 * FW_BUG
91 * Add this to a message where you are sure the firmware is buggy or behaves
92 * really stupid or out of spec. Be aware that the responsible BIOS developer
93 * should be able to fix this issue or at least get a concrete idea of the
94 * problem by reading your message without the need of looking at the kernel
95 * code.
96 *
97 * Use it for definite and high priority BIOS bugs.
98 *
99 * FW_WARN
100 * Use it for not that clear (e.g. could the kernel messed up things already?)
101 * and medium priority BIOS bugs.
102 *
103 * FW_INFO
104 * Use this one if you want to tell the user or vendor about something
105 * suspicious, but generally harmless related to the firmware.
106 *
107 * Use it for information or very low priority BIOS bugs.
108 */
109 #define FW_BUG "[Firmware Bug]: "
110 #define FW_WARN "[Firmware Warn]: "
111 #define FW_INFO "[Firmware Info]: "
112
113 /*
114 * HW_ERR
115 * Add this to a message for hardware errors, so that user can report
116 * it to hardware vendor instead of LKML or software vendor.
117 */
118 #define HW_ERR "[Hardware Error]: "
119
120 /*
121 * DEPRECATED
122 * Add this to a message whenever you want to warn user space about the use
123 * of a deprecated aspect of an API so they can stop using it
124 */
125 #define DEPRECATED "[Deprecated]: "
126
127 /*
128 * Dummy printk for disabled debugging statements to use whilst maintaining
129 * gcc's format checking.
130 */
131 #define no_printk(fmt, ...) \
132 ({ \
133 if (0) \
134 _printk(fmt, ##__VA_ARGS__); \
135 0; \
136 })
137
138 #ifdef CONFIG_EARLY_PRINTK
139 extern asmlinkage __printf(1, 2)
140 void early_printk(const char *fmt, ...);
141 #else
142 static inline __printf(1, 2) __cold
early_printk(const char * s,...)143 void early_printk(const char *s, ...) { }
144 #endif
145
146 struct dev_printk_info;
147
148 #ifdef CONFIG_PRINTK
149 asmlinkage __printf(4, 0)
150 int vprintk_emit(int facility, int level,
151 const struct dev_printk_info *dev_info,
152 const char *fmt, va_list args);
153
154 asmlinkage __printf(1, 0)
155 int vprintk(const char *fmt, va_list args);
156 __printf(1, 0)
157 int vprintk_deferred(const char *fmt, va_list args);
158
159 asmlinkage __printf(1, 2) __cold
160 int _printk(const char *fmt, ...);
161
162 /*
163 * Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !
164 */
165 __printf(1, 2) __cold int _printk_deferred(const char *fmt, ...);
166
167 extern void __printk_deferred_enter(void);
168 extern void __printk_deferred_exit(void);
169
170 extern void printk_force_console_enter(void);
171 extern void printk_force_console_exit(void);
172
173 /*
174 * The printk_deferred_enter/exit macros are available only as a hack for
175 * some code paths that need to defer all printk console printing. Interrupts
176 * must be disabled for the deferred duration.
177 */
178 #define printk_deferred_enter() __printk_deferred_enter()
179 #define printk_deferred_exit() __printk_deferred_exit()
180
181 /*
182 * Please don't use printk_ratelimit(), because it shares ratelimiting state
183 * with all other unrelated printk_ratelimit() callsites. Instead use
184 * printk_ratelimited() or plain old __ratelimit().
185 */
186 extern int __printk_ratelimit(const char *func);
187 #define printk_ratelimit() __printk_ratelimit(__func__)
188 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
189 unsigned int interval_msec);
190
191 extern int printk_delay_msec;
192 extern int dmesg_restrict;
193
194 extern void wake_up_klogd(void);
195
196 char *log_buf_addr_get(void);
197 u32 log_buf_len_get(void);
198 void log_buf_vmcoreinfo_setup(void);
199 void __init setup_log_buf(int early);
200 __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
201 void dump_stack_print_info(const char *log_lvl);
202 void show_regs_print_info(const char *log_lvl);
203 extern asmlinkage void dump_stack_lvl(const char *log_lvl) __cold;
204 extern asmlinkage void dump_stack(void) __cold;
205 void printk_trigger_flush(void);
206 void console_try_replay_all(void);
207 void printk_legacy_allow_panic_sync(void);
208 extern bool nbcon_device_try_acquire(struct console *con);
209 extern void nbcon_device_release(struct console *con);
210 void nbcon_atomic_flush_unsafe(void);
211 bool pr_flush(int timeout_ms, bool reset_on_progress);
212 #else
213 static inline __printf(1, 0)
vprintk(const char * s,va_list args)214 int vprintk(const char *s, va_list args)
215 {
216 return 0;
217 }
218 static inline __printf(1, 0)
vprintk_deferred(const char * fmt,va_list args)219 int vprintk_deferred(const char *fmt, va_list args)
220 {
221 return 0;
222 }
223 static inline __printf(1, 2) __cold
_printk(const char * s,...)224 int _printk(const char *s, ...)
225 {
226 return 0;
227 }
228 static inline __printf(1, 2) __cold
_printk_deferred(const char * s,...)229 int _printk_deferred(const char *s, ...)
230 {
231 return 0;
232 }
233
printk_deferred_enter(void)234 static inline void printk_deferred_enter(void)
235 {
236 }
237
printk_deferred_exit(void)238 static inline void printk_deferred_exit(void)
239 {
240 }
241
printk_force_console_enter(void)242 static inline void printk_force_console_enter(void)
243 {
244 }
245
printk_force_console_exit(void)246 static inline void printk_force_console_exit(void)
247 {
248 }
249
printk_ratelimit(void)250 static inline int printk_ratelimit(void)
251 {
252 return 0;
253 }
printk_timed_ratelimit(unsigned long * caller_jiffies,unsigned int interval_msec)254 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
255 unsigned int interval_msec)
256 {
257 return false;
258 }
259
wake_up_klogd(void)260 static inline void wake_up_klogd(void)
261 {
262 }
263
log_buf_addr_get(void)264 static inline char *log_buf_addr_get(void)
265 {
266 return NULL;
267 }
268
log_buf_len_get(void)269 static inline u32 log_buf_len_get(void)
270 {
271 return 0;
272 }
273
log_buf_vmcoreinfo_setup(void)274 static inline void log_buf_vmcoreinfo_setup(void)
275 {
276 }
277
setup_log_buf(int early)278 static inline void setup_log_buf(int early)
279 {
280 }
281
dump_stack_set_arch_desc(const char * fmt,...)282 static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
283 {
284 }
285
dump_stack_print_info(const char * log_lvl)286 static inline void dump_stack_print_info(const char *log_lvl)
287 {
288 }
289
show_regs_print_info(const char * log_lvl)290 static inline void show_regs_print_info(const char *log_lvl)
291 {
292 }
293
dump_stack_lvl(const char * log_lvl)294 static inline void dump_stack_lvl(const char *log_lvl)
295 {
296 }
297
dump_stack(void)298 static inline void dump_stack(void)
299 {
300 }
printk_trigger_flush(void)301 static inline void printk_trigger_flush(void)
302 {
303 }
console_try_replay_all(void)304 static inline void console_try_replay_all(void)
305 {
306 }
307
printk_legacy_allow_panic_sync(void)308 static inline void printk_legacy_allow_panic_sync(void)
309 {
310 }
311
nbcon_device_try_acquire(struct console * con)312 static inline bool nbcon_device_try_acquire(struct console *con)
313 {
314 return false;
315 }
316
nbcon_device_release(struct console * con)317 static inline void nbcon_device_release(struct console *con)
318 {
319 }
320
nbcon_atomic_flush_unsafe(void)321 static inline void nbcon_atomic_flush_unsafe(void)
322 {
323 }
324
pr_flush(int timeout_ms,bool reset_on_progress)325 static inline bool pr_flush(int timeout_ms, bool reset_on_progress)
326 {
327 return true;
328 }
329
330 #endif
331
332 #ifdef CONFIG_SMP
333 extern int __printk_cpu_sync_try_get(void);
334 extern void __printk_cpu_sync_wait(void);
335 extern void __printk_cpu_sync_put(void);
336
337 #else
338
339 #define __printk_cpu_sync_try_get() true
340 #define __printk_cpu_sync_wait()
341 #define __printk_cpu_sync_put()
342 #endif /* CONFIG_SMP */
343
344 /**
345 * printk_cpu_sync_get_irqsave() - Disable interrupts and acquire the printk
346 * cpu-reentrant spinning lock.
347 * @flags: Stack-allocated storage for saving local interrupt state,
348 * to be passed to printk_cpu_sync_put_irqrestore().
349 *
350 * If the lock is owned by another CPU, spin until it becomes available.
351 * Interrupts are restored while spinning.
352 *
353 * CAUTION: This function must be used carefully. It does not behave like a
354 * typical lock. Here are important things to watch out for...
355 *
356 * * This function is reentrant on the same CPU. Therefore the calling
357 * code must not assume exclusive access to data if code accessing the
358 * data can run reentrant or within NMI context on the same CPU.
359 *
360 * * If there exists usage of this function from NMI context, it becomes
361 * unsafe to perform any type of locking or spinning to wait for other
362 * CPUs after calling this function from any context. This includes
363 * using spinlocks or any other busy-waiting synchronization methods.
364 */
365 #define printk_cpu_sync_get_irqsave(flags) \
366 for (;;) { \
367 local_irq_save(flags); \
368 if (__printk_cpu_sync_try_get()) \
369 break; \
370 local_irq_restore(flags); \
371 __printk_cpu_sync_wait(); \
372 }
373
374 /**
375 * printk_cpu_sync_put_irqrestore() - Release the printk cpu-reentrant spinning
376 * lock and restore interrupts.
377 * @flags: Caller's saved interrupt state, from printk_cpu_sync_get_irqsave().
378 */
379 #define printk_cpu_sync_put_irqrestore(flags) \
380 do { \
381 __printk_cpu_sync_put(); \
382 local_irq_restore(flags); \
383 } while (0)
384
385 extern int kptr_restrict;
386
387 /**
388 * pr_fmt - used by the pr_*() macros to generate the printk format string
389 * @fmt: format string passed from a pr_*() macro
390 *
391 * This macro can be used to generate a unified format string for pr_*()
392 * macros. A common use is to prefix all pr_*() messages in a file with a common
393 * string. For example, defining this at the top of a source file:
394 *
395 * #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
396 *
397 * would prefix all pr_info, pr_emerg... messages in the file with the module
398 * name.
399 */
400 #ifndef pr_fmt
401 #define pr_fmt(fmt) fmt
402 #endif
403
404 struct module;
405
406 #ifdef CONFIG_PRINTK_INDEX
407 struct pi_entry {
408 const char *fmt;
409 const char *func;
410 const char *file;
411 unsigned int line;
412
413 /*
414 * While printk and pr_* have the level stored in the string at compile
415 * time, some subsystems dynamically add it at runtime through the
416 * format string. For these dynamic cases, we allow the subsystem to
417 * tell us the level at compile time.
418 *
419 * NULL indicates that the level, if any, is stored in fmt.
420 */
421 const char *level;
422
423 /*
424 * The format string used by various subsystem specific printk()
425 * wrappers to prefix the message.
426 *
427 * Note that the static prefix defined by the pr_fmt() macro is stored
428 * directly in the message format (@fmt), not here.
429 */
430 const char *subsys_fmt_prefix;
431 } __packed;
432
433 #define __printk_index_emit(_fmt, _level, _subsys_fmt_prefix) \
434 do { \
435 if (__builtin_constant_p(_fmt) && __builtin_constant_p(_level)) { \
436 /*
437 * We check __builtin_constant_p multiple times here
438 * for the same input because GCC will produce an error
439 * if we try to assign a static variable to fmt if it
440 * is not a constant, even with the outer if statement.
441 */ \
442 static const struct pi_entry _entry \
443 __used = { \
444 .fmt = __builtin_constant_p(_fmt) ? (_fmt) : NULL, \
445 .func = __func__, \
446 .file = __FILE__, \
447 .line = __LINE__, \
448 .level = __builtin_constant_p(_level) ? (_level) : NULL, \
449 .subsys_fmt_prefix = _subsys_fmt_prefix,\
450 }; \
451 static const struct pi_entry *_entry_ptr \
452 __used __section(".printk_index") = &_entry; \
453 } \
454 } while (0)
455
456 #else /* !CONFIG_PRINTK_INDEX */
457 #define __printk_index_emit(...) do {} while (0)
458 #endif /* CONFIG_PRINTK_INDEX */
459
460 /*
461 * Some subsystems have their own custom printk that applies a va_format to a
462 * generic format, for example, to include a device number or other metadata
463 * alongside the format supplied by the caller.
464 *
465 * In order to store these in the way they would be emitted by the printk
466 * infrastructure, the subsystem provides us with the start, fixed string, and
467 * any subsequent text in the format string.
468 *
469 * We take a variable argument list as pr_fmt/dev_fmt/etc are sometimes passed
470 * as multiple arguments (eg: `"%s: ", "blah"`), and we must only take the
471 * first one.
472 *
473 * subsys_fmt_prefix must be known at compile time, or compilation will fail
474 * (since this is a mistake). If fmt or level is not known at compile time, no
475 * index entry will be made (since this can legitimately happen).
476 */
477 #define printk_index_subsys_emit(subsys_fmt_prefix, level, fmt, ...) \
478 __printk_index_emit(fmt, level, subsys_fmt_prefix)
479
480 #define printk_index_wrap(_p_func, _fmt, ...) \
481 ({ \
482 __printk_index_emit(_fmt, NULL, NULL); \
483 _p_func(_fmt, ##__VA_ARGS__); \
484 })
485
486
487 /**
488 * printk - print a kernel message
489 * @fmt: format string
490 *
491 * This is printk(). It can be called from any context. We want it to work.
492 *
493 * If printk indexing is enabled, _printk() is called from printk_index_wrap.
494 * Otherwise, printk is simply #defined to _printk.
495 *
496 * We try to grab the console_lock. If we succeed, it's easy - we log the
497 * output and call the console drivers. If we fail to get the semaphore, we
498 * place the output into the log buffer and return. The current holder of
499 * the console_sem will notice the new output in console_unlock(); and will
500 * send it to the consoles before releasing the lock.
501 *
502 * One effect of this deferred printing is that code which calls printk() and
503 * then changes console_loglevel may break. This is because console_loglevel
504 * is inspected when the actual printing occurs.
505 *
506 * See also:
507 * printf(3)
508 *
509 * See the vsnprintf() documentation for format string extensions over C99.
510 */
511 #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
512 #define printk_deferred(fmt, ...) \
513 printk_index_wrap(_printk_deferred, fmt, ##__VA_ARGS__)
514
515 /**
516 * pr_emerg - Print an emergency-level message
517 * @fmt: format string
518 * @...: arguments for the format string
519 *
520 * This macro expands to a printk with KERN_EMERG loglevel. It uses pr_fmt() to
521 * generate the format string.
522 */
523 #define pr_emerg(fmt, ...) \
524 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
525 /**
526 * pr_alert - Print an alert-level message
527 * @fmt: format string
528 * @...: arguments for the format string
529 *
530 * This macro expands to a printk with KERN_ALERT loglevel. It uses pr_fmt() to
531 * generate the format string.
532 */
533 #define pr_alert(fmt, ...) \
534 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
535 /**
536 * pr_crit - Print a critical-level message
537 * @fmt: format string
538 * @...: arguments for the format string
539 *
540 * This macro expands to a printk with KERN_CRIT loglevel. It uses pr_fmt() to
541 * generate the format string.
542 */
543 #define pr_crit(fmt, ...) \
544 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
545 /**
546 * pr_err - Print an error-level message
547 * @fmt: format string
548 * @...: arguments for the format string
549 *
550 * This macro expands to a printk with KERN_ERR loglevel. It uses pr_fmt() to
551 * generate the format string.
552 */
553 #define pr_err(fmt, ...) \
554 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
555 /**
556 * pr_warn - Print a warning-level message
557 * @fmt: format string
558 * @...: arguments for the format string
559 *
560 * This macro expands to a printk with KERN_WARNING loglevel. It uses pr_fmt()
561 * to generate the format string.
562 */
563 #define pr_warn(fmt, ...) \
564 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
565 /**
566 * pr_notice - Print a notice-level message
567 * @fmt: format string
568 * @...: arguments for the format string
569 *
570 * This macro expands to a printk with KERN_NOTICE loglevel. It uses pr_fmt() to
571 * generate the format string.
572 */
573 #define pr_notice(fmt, ...) \
574 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
575 /**
576 * pr_info - Print an info-level message
577 * @fmt: format string
578 * @...: arguments for the format string
579 *
580 * This macro expands to a printk with KERN_INFO loglevel. It uses pr_fmt() to
581 * generate the format string.
582 */
583 #define pr_info(fmt, ...) \
584 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
585
586 /**
587 * pr_cont - Continues a previous log message in the same line.
588 * @fmt: format string
589 * @...: arguments for the format string
590 *
591 * This macro expands to a printk with KERN_CONT loglevel. It should only be
592 * used when continuing a log message with no newline ('\n') enclosed. Otherwise
593 * it defaults back to KERN_DEFAULT loglevel.
594 */
595 #define pr_cont(fmt, ...) \
596 printk(KERN_CONT fmt, ##__VA_ARGS__)
597
598 /**
599 * pr_devel - Print a debug-level message conditionally
600 * @fmt: format string
601 * @...: arguments for the format string
602 *
603 * This macro expands to a printk with KERN_DEBUG loglevel if DEBUG is
604 * defined. Otherwise it does nothing.
605 *
606 * It uses pr_fmt() to generate the format string.
607 */
608 #ifdef DEBUG
609 #define pr_devel(fmt, ...) \
610 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
611 #else
612 #define pr_devel(fmt, ...) \
613 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
614 #endif
615
616
617 /* If you are writing a driver, please use dev_dbg instead */
618 #if defined(CONFIG_DYNAMIC_DEBUG) || \
619 (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
620 #include <linux/dynamic_debug.h>
621
622 /**
623 * pr_debug - Print a debug-level message conditionally
624 * @fmt: format string
625 * @...: arguments for the format string
626 *
627 * This macro expands to dynamic_pr_debug() if CONFIG_DYNAMIC_DEBUG is
628 * set. Otherwise, if DEBUG is defined, it's equivalent to a printk with
629 * KERN_DEBUG loglevel. If DEBUG is not defined it does nothing.
630 *
631 * It uses pr_fmt() to generate the format string (dynamic_pr_debug() uses
632 * pr_fmt() internally).
633 */
634 #define pr_debug(fmt, ...) \
635 dynamic_pr_debug(fmt, ##__VA_ARGS__)
636 #elif defined(DEBUG)
637 #define pr_debug(fmt, ...) \
638 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
639 #else
640 #define pr_debug(fmt, ...) \
641 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
642 #endif
643
644 /*
645 * Print a one-time message (analogous to WARN_ONCE() et al):
646 */
647
648 #ifdef CONFIG_PRINTK
649 #define printk_once(fmt, ...) \
650 DO_ONCE_LITE(printk, fmt, ##__VA_ARGS__)
651 #define printk_deferred_once(fmt, ...) \
652 DO_ONCE_LITE(printk_deferred, fmt, ##__VA_ARGS__)
653 #else
654 #define printk_once(fmt, ...) \
655 no_printk(fmt, ##__VA_ARGS__)
656 #define printk_deferred_once(fmt, ...) \
657 no_printk(fmt, ##__VA_ARGS__)
658 #endif
659
660 #define pr_emerg_once(fmt, ...) \
661 printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
662 #define pr_alert_once(fmt, ...) \
663 printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
664 #define pr_crit_once(fmt, ...) \
665 printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
666 #define pr_err_once(fmt, ...) \
667 printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
668 #define pr_warn_once(fmt, ...) \
669 printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
670 #define pr_notice_once(fmt, ...) \
671 printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
672 #define pr_info_once(fmt, ...) \
673 printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
674 /* no pr_cont_once, don't do that... */
675
676 #if defined(DEBUG)
677 #define pr_devel_once(fmt, ...) \
678 printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
679 #else
680 #define pr_devel_once(fmt, ...) \
681 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
682 #endif
683
684 /* If you are writing a driver, please use dev_dbg instead */
685 #if defined(DEBUG)
686 #define pr_debug_once(fmt, ...) \
687 printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
688 #else
689 #define pr_debug_once(fmt, ...) \
690 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
691 #endif
692
693 /*
694 * ratelimited messages with local ratelimit_state,
695 * no local ratelimit_state used in the !PRINTK case
696 */
697 #ifdef CONFIG_PRINTK
698 #define printk_ratelimited(fmt, ...) \
699 ({ \
700 static DEFINE_RATELIMIT_STATE(_rs, \
701 DEFAULT_RATELIMIT_INTERVAL, \
702 DEFAULT_RATELIMIT_BURST); \
703 \
704 if (__ratelimit(&_rs)) \
705 printk(fmt, ##__VA_ARGS__); \
706 })
707 #else
708 #define printk_ratelimited(fmt, ...) \
709 no_printk(fmt, ##__VA_ARGS__)
710 #endif
711
712 #define pr_emerg_ratelimited(fmt, ...) \
713 printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
714 #define pr_alert_ratelimited(fmt, ...) \
715 printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
716 #define pr_crit_ratelimited(fmt, ...) \
717 printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
718 #define pr_err_ratelimited(fmt, ...) \
719 printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
720 #define pr_warn_ratelimited(fmt, ...) \
721 printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
722 #define pr_notice_ratelimited(fmt, ...) \
723 printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
724 #define pr_info_ratelimited(fmt, ...) \
725 printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
726 /* no pr_cont_ratelimited, don't do that... */
727
728 #if defined(DEBUG)
729 #define pr_devel_ratelimited(fmt, ...) \
730 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
731 #else
732 #define pr_devel_ratelimited(fmt, ...) \
733 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
734 #endif
735
736 /* If you are writing a driver, please use dev_dbg instead */
737 #if defined(CONFIG_DYNAMIC_DEBUG) || \
738 (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
739 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
740 #define pr_debug_ratelimited(fmt, ...) \
741 do { \
742 static DEFINE_RATELIMIT_STATE(_rs, \
743 DEFAULT_RATELIMIT_INTERVAL, \
744 DEFAULT_RATELIMIT_BURST); \
745 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt)); \
746 if (DYNAMIC_DEBUG_BRANCH(descriptor) && \
747 __ratelimit(&_rs)) \
748 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__); \
749 } while (0)
750 #elif defined(DEBUG)
751 #define pr_debug_ratelimited(fmt, ...) \
752 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
753 #else
754 #define pr_debug_ratelimited(fmt, ...) \
755 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
756 #endif
757
758 extern const struct file_operations kmsg_fops;
759
760 enum {
761 DUMP_PREFIX_NONE,
762 DUMP_PREFIX_ADDRESS,
763 DUMP_PREFIX_OFFSET
764 };
765 extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
766 int groupsize, char *linebuf, size_t linebuflen,
767 bool ascii);
768 #ifdef CONFIG_PRINTK
769 extern void print_hex_dump(const char *level, const char *prefix_str,
770 int prefix_type, int rowsize, int groupsize,
771 const void *buf, size_t len, bool ascii);
772 #else
print_hex_dump(const char * level,const char * prefix_str,int prefix_type,int rowsize,int groupsize,const void * buf,size_t len,bool ascii)773 static inline void print_hex_dump(const char *level, const char *prefix_str,
774 int prefix_type, int rowsize, int groupsize,
775 const void *buf, size_t len, bool ascii)
776 {
777 }
print_hex_dump_bytes(const char * prefix_str,int prefix_type,const void * buf,size_t len)778 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
779 const void *buf, size_t len)
780 {
781 }
782
783 #endif
784
785 #if defined(CONFIG_DYNAMIC_DEBUG) || \
786 (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
787 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
788 groupsize, buf, len, ascii) \
789 dynamic_hex_dump(prefix_str, prefix_type, rowsize, \
790 groupsize, buf, len, ascii)
791 #elif defined(DEBUG)
792 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
793 groupsize, buf, len, ascii) \
794 print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize, \
795 groupsize, buf, len, ascii)
796 #else
print_hex_dump_debug(const char * prefix_str,int prefix_type,int rowsize,int groupsize,const void * buf,size_t len,bool ascii)797 static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
798 int rowsize, int groupsize,
799 const void *buf, size_t len, bool ascii)
800 {
801 }
802 #endif
803
804 /**
805 * print_hex_dump_bytes - shorthand form of print_hex_dump() with default params
806 * @prefix_str: string to prefix each line with;
807 * caller supplies trailing spaces for alignment if desired
808 * @prefix_type: controls whether prefix of an offset, address, or none
809 * is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
810 * @buf: data blob to dump
811 * @len: number of bytes in the @buf
812 *
813 * Calls print_hex_dump(), with log level of KERN_DEBUG,
814 * rowsize of 16, groupsize of 1, and ASCII output included.
815 */
816 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
817 print_hex_dump_debug(prefix_str, prefix_type, 16, 1, buf, len, true)
818
819 #endif
820