Line data Source code
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 : extern const char linux_banner[];
13 : extern const char linux_proc_banner[];
14 :
15 : extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
16 :
17 : #define PRINTK_MAX_SINGLE_HEADER_LEN 2
18 :
19 : static inline int printk_get_level(const char *buffer)
20 : {
21 3430 : if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
22 1502 : switch (buffer[1]) {
23 : case '0' ... '7':
24 : case 'c': /* KERN_CONT */
25 : return buffer[1];
26 : }
27 : }
28 : return 0;
29 : }
30 :
31 : static inline const char *printk_skip_level(const char *buffer)
32 : {
33 : if (printk_get_level(buffer))
34 : return buffer + 2;
35 :
36 : return buffer;
37 : }
38 :
39 : static inline const char *printk_skip_headers(const char *buffer)
40 : {
41 : while (printk_get_level(buffer))
42 : buffer = printk_skip_level(buffer);
43 :
44 : return buffer;
45 : }
46 :
47 : /* printk's without a loglevel use this.. */
48 : #define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT
49 :
50 : /* We show everything that is MORE important than this.. */
51 : #define CONSOLE_LOGLEVEL_SILENT 0 /* Mum's the word */
52 : #define CONSOLE_LOGLEVEL_MIN 1 /* Minimum loglevel we let people use */
53 : #define CONSOLE_LOGLEVEL_DEBUG 10 /* issue debug messages */
54 : #define CONSOLE_LOGLEVEL_MOTORMOUTH 15 /* You can't shut this one up */
55 :
56 : /*
57 : * Default used to be hard-coded at 7, quiet used to be hardcoded at 4,
58 : * we're now allowing both to be set from kernel config.
59 : */
60 : #define CONSOLE_LOGLEVEL_DEFAULT CONFIG_CONSOLE_LOGLEVEL_DEFAULT
61 : #define CONSOLE_LOGLEVEL_QUIET CONFIG_CONSOLE_LOGLEVEL_QUIET
62 :
63 : extern int console_printk[];
64 :
65 : #define console_loglevel (console_printk[0])
66 : #define default_message_loglevel (console_printk[1])
67 : #define minimum_console_loglevel (console_printk[2])
68 : #define default_console_loglevel (console_printk[3])
69 :
70 : extern void console_verbose(void);
71 :
72 : /* strlen("ratelimit") + 1 */
73 : #define DEVKMSG_STR_MAX_SIZE 10
74 : extern char devkmsg_log_str[];
75 : struct ctl_table;
76 :
77 : extern int suppress_printk;
78 :
79 : struct va_format {
80 : const char *fmt;
81 : va_list *va;
82 : };
83 :
84 : /*
85 : * FW_BUG
86 : * Add this to a message where you are sure the firmware is buggy or behaves
87 : * really stupid or out of spec. Be aware that the responsible BIOS developer
88 : * should be able to fix this issue or at least get a concrete idea of the
89 : * problem by reading your message without the need of looking at the kernel
90 : * code.
91 : *
92 : * Use it for definite and high priority BIOS bugs.
93 : *
94 : * FW_WARN
95 : * Use it for not that clear (e.g. could the kernel messed up things already?)
96 : * and medium priority BIOS bugs.
97 : *
98 : * FW_INFO
99 : * Use this one if you want to tell the user or vendor about something
100 : * suspicious, but generally harmless related to the firmware.
101 : *
102 : * Use it for information or very low priority BIOS bugs.
103 : */
104 : #define FW_BUG "[Firmware Bug]: "
105 : #define FW_WARN "[Firmware Warn]: "
106 : #define FW_INFO "[Firmware Info]: "
107 :
108 : /*
109 : * HW_ERR
110 : * Add this to a message for hardware errors, so that user can report
111 : * it to hardware vendor instead of LKML or software vendor.
112 : */
113 : #define HW_ERR "[Hardware Error]: "
114 :
115 : /*
116 : * DEPRECATED
117 : * Add this to a message whenever you want to warn user space about the use
118 : * of a deprecated aspect of an API so they can stop using it
119 : */
120 : #define DEPRECATED "[Deprecated]: "
121 :
122 : /*
123 : * Dummy printk for disabled debugging statements to use whilst maintaining
124 : * gcc's format checking.
125 : */
126 : #define no_printk(fmt, ...) \
127 : ({ \
128 : if (0) \
129 : printk(fmt, ##__VA_ARGS__); \
130 : 0; \
131 : })
132 :
133 : #ifdef CONFIG_EARLY_PRINTK
134 : extern asmlinkage __printf(1, 2)
135 : void early_printk(const char *fmt, ...);
136 : #else
137 : static inline __printf(1, 2) __cold
138 : void early_printk(const char *s, ...) { }
139 : #endif
140 :
141 : struct dev_printk_info;
142 :
143 : #ifdef CONFIG_PRINTK
144 : asmlinkage __printf(4, 0)
145 : int vprintk_emit(int facility, int level,
146 : const struct dev_printk_info *dev_info,
147 : const char *fmt, va_list args);
148 :
149 : asmlinkage __printf(1, 0)
150 : int vprintk(const char *fmt, va_list args);
151 :
152 : asmlinkage __printf(1, 2) __cold
153 : int _printk(const char *fmt, ...);
154 :
155 : /*
156 : * Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !
157 : */
158 : __printf(1, 2) __cold int _printk_deferred(const char *fmt, ...);
159 :
160 : extern void __printk_safe_enter(void);
161 : extern void __printk_safe_exit(void);
162 : /*
163 : * The printk_deferred_enter/exit macros are available only as a hack for
164 : * some code paths that need to defer all printk console printing. Interrupts
165 : * must be disabled for the deferred duration.
166 : */
167 : #define printk_deferred_enter __printk_safe_enter
168 : #define printk_deferred_exit __printk_safe_exit
169 :
170 : /*
171 : * Please don't use printk_ratelimit(), because it shares ratelimiting state
172 : * with all other unrelated printk_ratelimit() callsites. Instead use
173 : * printk_ratelimited() or plain old __ratelimit().
174 : */
175 : extern int __printk_ratelimit(const char *func);
176 : #define printk_ratelimit() __printk_ratelimit(__func__)
177 : extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
178 : unsigned int interval_msec);
179 :
180 : extern int printk_delay_msec;
181 : extern int dmesg_restrict;
182 :
183 : extern void wake_up_klogd(void);
184 :
185 : char *log_buf_addr_get(void);
186 : u32 log_buf_len_get(void);
187 : void log_buf_vmcoreinfo_setup(void);
188 : void __init setup_log_buf(int early);
189 : __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
190 : void dump_stack_print_info(const char *log_lvl);
191 : void show_regs_print_info(const char *log_lvl);
192 : extern asmlinkage void dump_stack_lvl(const char *log_lvl) __cold;
193 : extern asmlinkage void dump_stack(void) __cold;
194 : void printk_trigger_flush(void);
195 : #else
196 : static inline __printf(1, 0)
197 : int vprintk(const char *s, va_list args)
198 : {
199 : return 0;
200 : }
201 : static inline __printf(1, 2) __cold
202 : int _printk(const char *s, ...)
203 : {
204 : return 0;
205 : }
206 : static inline __printf(1, 2) __cold
207 : int _printk_deferred(const char *s, ...)
208 : {
209 : return 0;
210 : }
211 :
212 : static inline void printk_deferred_enter(void)
213 : {
214 : }
215 :
216 : static inline void printk_deferred_exit(void)
217 : {
218 : }
219 :
220 : static inline int printk_ratelimit(void)
221 : {
222 : return 0;
223 : }
224 : static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
225 : unsigned int interval_msec)
226 : {
227 : return false;
228 : }
229 :
230 : static inline void wake_up_klogd(void)
231 : {
232 : }
233 :
234 : static inline char *log_buf_addr_get(void)
235 : {
236 : return NULL;
237 : }
238 :
239 : static inline u32 log_buf_len_get(void)
240 : {
241 : return 0;
242 : }
243 :
244 : static inline void log_buf_vmcoreinfo_setup(void)
245 : {
246 : }
247 :
248 : static inline void setup_log_buf(int early)
249 : {
250 : }
251 :
252 : static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
253 : {
254 : }
255 :
256 : static inline void dump_stack_print_info(const char *log_lvl)
257 : {
258 : }
259 :
260 : static inline void show_regs_print_info(const char *log_lvl)
261 : {
262 : }
263 :
264 : static inline void dump_stack_lvl(const char *log_lvl)
265 : {
266 : }
267 :
268 : static inline void dump_stack(void)
269 : {
270 : }
271 : static inline void printk_trigger_flush(void)
272 : {
273 : }
274 : #endif
275 :
276 : #ifdef CONFIG_SMP
277 : extern int __printk_cpu_sync_try_get(void);
278 : extern void __printk_cpu_sync_wait(void);
279 : extern void __printk_cpu_sync_put(void);
280 :
281 : #else
282 :
283 : #define __printk_cpu_sync_try_get() true
284 : #define __printk_cpu_sync_wait()
285 : #define __printk_cpu_sync_put()
286 : #endif /* CONFIG_SMP */
287 :
288 : /**
289 : * printk_cpu_sync_get_irqsave() - Disable interrupts and acquire the printk
290 : * cpu-reentrant spinning lock.
291 : * @flags: Stack-allocated storage for saving local interrupt state,
292 : * to be passed to printk_cpu_sync_put_irqrestore().
293 : *
294 : * If the lock is owned by another CPU, spin until it becomes available.
295 : * Interrupts are restored while spinning.
296 : *
297 : * CAUTION: This function must be used carefully. It does not behave like a
298 : * typical lock. Here are important things to watch out for...
299 : *
300 : * * This function is reentrant on the same CPU. Therefore the calling
301 : * code must not assume exclusive access to data if code accessing the
302 : * data can run reentrant or within NMI context on the same CPU.
303 : *
304 : * * If there exists usage of this function from NMI context, it becomes
305 : * unsafe to perform any type of locking or spinning to wait for other
306 : * CPUs after calling this function from any context. This includes
307 : * using spinlocks or any other busy-waiting synchronization methods.
308 : */
309 : #define printk_cpu_sync_get_irqsave(flags) \
310 : for (;;) { \
311 : local_irq_save(flags); \
312 : if (__printk_cpu_sync_try_get()) \
313 : break; \
314 : local_irq_restore(flags); \
315 : __printk_cpu_sync_wait(); \
316 : }
317 :
318 : /**
319 : * printk_cpu_sync_put_irqrestore() - Release the printk cpu-reentrant spinning
320 : * lock and restore interrupts.
321 : * @flags: Caller's saved interrupt state, from printk_cpu_sync_get_irqsave().
322 : */
323 : #define printk_cpu_sync_put_irqrestore(flags) \
324 : do { \
325 : __printk_cpu_sync_put(); \
326 : local_irq_restore(flags); \
327 : } while (0)
328 :
329 : extern int kptr_restrict;
330 :
331 : /**
332 : * pr_fmt - used by the pr_*() macros to generate the printk format string
333 : * @fmt: format string passed from a pr_*() macro
334 : *
335 : * This macro can be used to generate a unified format string for pr_*()
336 : * macros. A common use is to prefix all pr_*() messages in a file with a common
337 : * string. For example, defining this at the top of a source file:
338 : *
339 : * #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
340 : *
341 : * would prefix all pr_info, pr_emerg... messages in the file with the module
342 : * name.
343 : */
344 : #ifndef pr_fmt
345 : #define pr_fmt(fmt) fmt
346 : #endif
347 :
348 : struct module;
349 :
350 : #ifdef CONFIG_PRINTK_INDEX
351 : struct pi_entry {
352 : const char *fmt;
353 : const char *func;
354 : const char *file;
355 : unsigned int line;
356 :
357 : /*
358 : * While printk and pr_* have the level stored in the string at compile
359 : * time, some subsystems dynamically add it at runtime through the
360 : * format string. For these dynamic cases, we allow the subsystem to
361 : * tell us the level at compile time.
362 : *
363 : * NULL indicates that the level, if any, is stored in fmt.
364 : */
365 : const char *level;
366 :
367 : /*
368 : * The format string used by various subsystem specific printk()
369 : * wrappers to prefix the message.
370 : *
371 : * Note that the static prefix defined by the pr_fmt() macro is stored
372 : * directly in the message format (@fmt), not here.
373 : */
374 : const char *subsys_fmt_prefix;
375 : } __packed;
376 :
377 : #define __printk_index_emit(_fmt, _level, _subsys_fmt_prefix) \
378 : do { \
379 : if (__builtin_constant_p(_fmt) && __builtin_constant_p(_level)) { \
380 : /*
381 : * We check __builtin_constant_p multiple times here
382 : * for the same input because GCC will produce an error
383 : * if we try to assign a static variable to fmt if it
384 : * is not a constant, even with the outer if statement.
385 : */ \
386 : static const struct pi_entry _entry \
387 : __used = { \
388 : .fmt = __builtin_constant_p(_fmt) ? (_fmt) : NULL, \
389 : .func = __func__, \
390 : .file = __FILE__, \
391 : .line = __LINE__, \
392 : .level = __builtin_constant_p(_level) ? (_level) : NULL, \
393 : .subsys_fmt_prefix = _subsys_fmt_prefix,\
394 : }; \
395 : static const struct pi_entry *_entry_ptr \
396 : __used __section(".printk_index") = &_entry; \
397 : } \
398 : } while (0)
399 :
400 : #else /* !CONFIG_PRINTK_INDEX */
401 : #define __printk_index_emit(...) do {} while (0)
402 : #endif /* CONFIG_PRINTK_INDEX */
403 :
404 : /*
405 : * Some subsystems have their own custom printk that applies a va_format to a
406 : * generic format, for example, to include a device number or other metadata
407 : * alongside the format supplied by the caller.
408 : *
409 : * In order to store these in the way they would be emitted by the printk
410 : * infrastructure, the subsystem provides us with the start, fixed string, and
411 : * any subsequent text in the format string.
412 : *
413 : * We take a variable argument list as pr_fmt/dev_fmt/etc are sometimes passed
414 : * as multiple arguments (eg: `"%s: ", "blah"`), and we must only take the
415 : * first one.
416 : *
417 : * subsys_fmt_prefix must be known at compile time, or compilation will fail
418 : * (since this is a mistake). If fmt or level is not known at compile time, no
419 : * index entry will be made (since this can legitimately happen).
420 : */
421 : #define printk_index_subsys_emit(subsys_fmt_prefix, level, fmt, ...) \
422 : __printk_index_emit(fmt, level, subsys_fmt_prefix)
423 :
424 : #define printk_index_wrap(_p_func, _fmt, ...) \
425 : ({ \
426 : __printk_index_emit(_fmt, NULL, NULL); \
427 : _p_func(_fmt, ##__VA_ARGS__); \
428 : })
429 :
430 :
431 : /**
432 : * printk - print a kernel message
433 : * @fmt: format string
434 : *
435 : * This is printk(). It can be called from any context. We want it to work.
436 : *
437 : * If printk indexing is enabled, _printk() is called from printk_index_wrap.
438 : * Otherwise, printk is simply #defined to _printk.
439 : *
440 : * We try to grab the console_lock. If we succeed, it's easy - we log the
441 : * output and call the console drivers. If we fail to get the semaphore, we
442 : * place the output into the log buffer and return. The current holder of
443 : * the console_sem will notice the new output in console_unlock(); and will
444 : * send it to the consoles before releasing the lock.
445 : *
446 : * One effect of this deferred printing is that code which calls printk() and
447 : * then changes console_loglevel may break. This is because console_loglevel
448 : * is inspected when the actual printing occurs.
449 : *
450 : * See also:
451 : * printf(3)
452 : *
453 : * See the vsnprintf() documentation for format string extensions over C99.
454 : */
455 : #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
456 : #define printk_deferred(fmt, ...) \
457 : printk_index_wrap(_printk_deferred, fmt, ##__VA_ARGS__)
458 :
459 : /**
460 : * pr_emerg - Print an emergency-level message
461 : * @fmt: format string
462 : * @...: arguments for the format string
463 : *
464 : * This macro expands to a printk with KERN_EMERG loglevel. It uses pr_fmt() to
465 : * generate the format string.
466 : */
467 : #define pr_emerg(fmt, ...) \
468 : printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
469 : /**
470 : * pr_alert - Print an alert-level message
471 : * @fmt: format string
472 : * @...: arguments for the format string
473 : *
474 : * This macro expands to a printk with KERN_ALERT loglevel. It uses pr_fmt() to
475 : * generate the format string.
476 : */
477 : #define pr_alert(fmt, ...) \
478 : printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
479 : /**
480 : * pr_crit - Print a critical-level message
481 : * @fmt: format string
482 : * @...: arguments for the format string
483 : *
484 : * This macro expands to a printk with KERN_CRIT loglevel. It uses pr_fmt() to
485 : * generate the format string.
486 : */
487 : #define pr_crit(fmt, ...) \
488 : printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
489 : /**
490 : * pr_err - Print an error-level message
491 : * @fmt: format string
492 : * @...: arguments for the format string
493 : *
494 : * This macro expands to a printk with KERN_ERR loglevel. It uses pr_fmt() to
495 : * generate the format string.
496 : */
497 : #define pr_err(fmt, ...) \
498 : printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
499 : /**
500 : * pr_warn - Print a warning-level message
501 : * @fmt: format string
502 : * @...: arguments for the format string
503 : *
504 : * This macro expands to a printk with KERN_WARNING loglevel. It uses pr_fmt()
505 : * to generate the format string.
506 : */
507 : #define pr_warn(fmt, ...) \
508 : printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
509 : /**
510 : * pr_notice - Print a notice-level message
511 : * @fmt: format string
512 : * @...: arguments for the format string
513 : *
514 : * This macro expands to a printk with KERN_NOTICE loglevel. It uses pr_fmt() to
515 : * generate the format string.
516 : */
517 : #define pr_notice(fmt, ...) \
518 : printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
519 : /**
520 : * pr_info - Print an info-level message
521 : * @fmt: format string
522 : * @...: arguments for the format string
523 : *
524 : * This macro expands to a printk with KERN_INFO loglevel. It uses pr_fmt() to
525 : * generate the format string.
526 : */
527 : #define pr_info(fmt, ...) \
528 : printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
529 :
530 : /**
531 : * pr_cont - Continues a previous log message in the same line.
532 : * @fmt: format string
533 : * @...: arguments for the format string
534 : *
535 : * This macro expands to a printk with KERN_CONT loglevel. It should only be
536 : * used when continuing a log message with no newline ('\n') enclosed. Otherwise
537 : * it defaults back to KERN_DEFAULT loglevel.
538 : */
539 : #define pr_cont(fmt, ...) \
540 : printk(KERN_CONT fmt, ##__VA_ARGS__)
541 :
542 : /**
543 : * pr_devel - Print a debug-level message conditionally
544 : * @fmt: format string
545 : * @...: arguments for the format string
546 : *
547 : * This macro expands to a printk with KERN_DEBUG loglevel if DEBUG is
548 : * defined. Otherwise it does nothing.
549 : *
550 : * It uses pr_fmt() to generate the format string.
551 : */
552 : #ifdef DEBUG
553 : #define pr_devel(fmt, ...) \
554 : printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
555 : #else
556 : #define pr_devel(fmt, ...) \
557 : no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
558 : #endif
559 :
560 :
561 : /* If you are writing a driver, please use dev_dbg instead */
562 : #if defined(CONFIG_DYNAMIC_DEBUG) || \
563 : (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
564 : #include <linux/dynamic_debug.h>
565 :
566 : /**
567 : * pr_debug - Print a debug-level message conditionally
568 : * @fmt: format string
569 : * @...: arguments for the format string
570 : *
571 : * This macro expands to dynamic_pr_debug() if CONFIG_DYNAMIC_DEBUG is
572 : * set. Otherwise, if DEBUG is defined, it's equivalent to a printk with
573 : * KERN_DEBUG loglevel. If DEBUG is not defined it does nothing.
574 : *
575 : * It uses pr_fmt() to generate the format string (dynamic_pr_debug() uses
576 : * pr_fmt() internally).
577 : */
578 : #define pr_debug(fmt, ...) \
579 : dynamic_pr_debug(fmt, ##__VA_ARGS__)
580 : #elif defined(DEBUG)
581 : #define pr_debug(fmt, ...) \
582 : printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
583 : #else
584 : #define pr_debug(fmt, ...) \
585 : no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
586 : #endif
587 :
588 : /*
589 : * Print a one-time message (analogous to WARN_ONCE() et al):
590 : */
591 :
592 : #ifdef CONFIG_PRINTK
593 : #define printk_once(fmt, ...) \
594 : DO_ONCE_LITE(printk, fmt, ##__VA_ARGS__)
595 : #define printk_deferred_once(fmt, ...) \
596 : DO_ONCE_LITE(printk_deferred, fmt, ##__VA_ARGS__)
597 : #else
598 : #define printk_once(fmt, ...) \
599 : no_printk(fmt, ##__VA_ARGS__)
600 : #define printk_deferred_once(fmt, ...) \
601 : no_printk(fmt, ##__VA_ARGS__)
602 : #endif
603 :
604 : #define pr_emerg_once(fmt, ...) \
605 : printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
606 : #define pr_alert_once(fmt, ...) \
607 : printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
608 : #define pr_crit_once(fmt, ...) \
609 : printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
610 : #define pr_err_once(fmt, ...) \
611 : printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
612 : #define pr_warn_once(fmt, ...) \
613 : printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
614 : #define pr_notice_once(fmt, ...) \
615 : printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
616 : #define pr_info_once(fmt, ...) \
617 : printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
618 : /* no pr_cont_once, don't do that... */
619 :
620 : #if defined(DEBUG)
621 : #define pr_devel_once(fmt, ...) \
622 : printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
623 : #else
624 : #define pr_devel_once(fmt, ...) \
625 : no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
626 : #endif
627 :
628 : /* If you are writing a driver, please use dev_dbg instead */
629 : #if defined(DEBUG)
630 : #define pr_debug_once(fmt, ...) \
631 : printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
632 : #else
633 : #define pr_debug_once(fmt, ...) \
634 : no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
635 : #endif
636 :
637 : /*
638 : * ratelimited messages with local ratelimit_state,
639 : * no local ratelimit_state used in the !PRINTK case
640 : */
641 : #ifdef CONFIG_PRINTK
642 : #define printk_ratelimited(fmt, ...) \
643 : ({ \
644 : static DEFINE_RATELIMIT_STATE(_rs, \
645 : DEFAULT_RATELIMIT_INTERVAL, \
646 : DEFAULT_RATELIMIT_BURST); \
647 : \
648 : if (__ratelimit(&_rs)) \
649 : printk(fmt, ##__VA_ARGS__); \
650 : })
651 : #else
652 : #define printk_ratelimited(fmt, ...) \
653 : no_printk(fmt, ##__VA_ARGS__)
654 : #endif
655 :
656 : #define pr_emerg_ratelimited(fmt, ...) \
657 : printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
658 : #define pr_alert_ratelimited(fmt, ...) \
659 : printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
660 : #define pr_crit_ratelimited(fmt, ...) \
661 : printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
662 : #define pr_err_ratelimited(fmt, ...) \
663 : printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
664 : #define pr_warn_ratelimited(fmt, ...) \
665 : printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
666 : #define pr_notice_ratelimited(fmt, ...) \
667 : printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
668 : #define pr_info_ratelimited(fmt, ...) \
669 : printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
670 : /* no pr_cont_ratelimited, don't do that... */
671 :
672 : #if defined(DEBUG)
673 : #define pr_devel_ratelimited(fmt, ...) \
674 : printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
675 : #else
676 : #define pr_devel_ratelimited(fmt, ...) \
677 : no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
678 : #endif
679 :
680 : /* If you are writing a driver, please use dev_dbg instead */
681 : #if defined(CONFIG_DYNAMIC_DEBUG) || \
682 : (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
683 : /* descriptor check is first to prevent flooding with "callbacks suppressed" */
684 : #define pr_debug_ratelimited(fmt, ...) \
685 : do { \
686 : static DEFINE_RATELIMIT_STATE(_rs, \
687 : DEFAULT_RATELIMIT_INTERVAL, \
688 : DEFAULT_RATELIMIT_BURST); \
689 : DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt)); \
690 : if (DYNAMIC_DEBUG_BRANCH(descriptor) && \
691 : __ratelimit(&_rs)) \
692 : __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__); \
693 : } while (0)
694 : #elif defined(DEBUG)
695 : #define pr_debug_ratelimited(fmt, ...) \
696 : printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
697 : #else
698 : #define pr_debug_ratelimited(fmt, ...) \
699 : no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
700 : #endif
701 :
702 : extern const struct file_operations kmsg_fops;
703 :
704 : enum {
705 : DUMP_PREFIX_NONE,
706 : DUMP_PREFIX_ADDRESS,
707 : DUMP_PREFIX_OFFSET
708 : };
709 : extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
710 : int groupsize, char *linebuf, size_t linebuflen,
711 : bool ascii);
712 : #ifdef CONFIG_PRINTK
713 : extern void print_hex_dump(const char *level, const char *prefix_str,
714 : int prefix_type, int rowsize, int groupsize,
715 : const void *buf, size_t len, bool ascii);
716 : #else
717 : static inline void print_hex_dump(const char *level, const char *prefix_str,
718 : int prefix_type, int rowsize, int groupsize,
719 : const void *buf, size_t len, bool ascii)
720 : {
721 : }
722 : static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
723 : const void *buf, size_t len)
724 : {
725 : }
726 :
727 : #endif
728 :
729 : #if defined(CONFIG_DYNAMIC_DEBUG) || \
730 : (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
731 : #define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
732 : groupsize, buf, len, ascii) \
733 : dynamic_hex_dump(prefix_str, prefix_type, rowsize, \
734 : groupsize, buf, len, ascii)
735 : #elif defined(DEBUG)
736 : #define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
737 : groupsize, buf, len, ascii) \
738 : print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize, \
739 : groupsize, buf, len, ascii)
740 : #else
741 : static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
742 : int rowsize, int groupsize,
743 : const void *buf, size_t len, bool ascii)
744 : {
745 : }
746 : #endif
747 :
748 : /**
749 : * print_hex_dump_bytes - shorthand form of print_hex_dump() with default params
750 : * @prefix_str: string to prefix each line with;
751 : * caller supplies trailing spaces for alignment if desired
752 : * @prefix_type: controls whether prefix of an offset, address, or none
753 : * is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
754 : * @buf: data blob to dump
755 : * @len: number of bytes in the @buf
756 : *
757 : * Calls print_hex_dump(), with log level of KERN_DEBUG,
758 : * rowsize of 16, groupsize of 1, and ASCII output included.
759 : */
760 : #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
761 : print_hex_dump_debug(prefix_str, prefix_type, 16, 1, buf, len, true)
762 :
763 : #endif
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