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1 #ifndef __KERNEL_PRINTK__
2 #define __KERNEL_PRINTK__
3
4 #include <stdarg.h>
5 #include <linux/init.h>
6 #include <linux/kern_levels.h>
7 #include <linux/linkage.h>
8 #include <linux/cache.h>
9
10 extern const char linux_banner[];
11 extern const char linux_proc_banner[];
12
13 #define PRINTK_MAX_SINGLE_HEADER_LEN 2
14
15 static inline int printk_get_level(const char *buffer)
16 {
17 if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
18 switch (buffer[1]) {
19 case '0' ... '7':
20 case 'd': /* KERN_DEFAULT */
21 case 'c': /* KERN_CONT */
22 return buffer[1];
23 }
24 }
25 return 0;
26 }
27
28 static inline const char *printk_skip_level(const char *buffer)
29 {
30 if (printk_get_level(buffer))
31 return buffer + 2;
32
33 return buffer;
34 }
35
36 static inline const char *printk_skip_headers(const char *buffer)
37 {
38 while (printk_get_level(buffer))
39 buffer = printk_skip_level(buffer);
40
41 return buffer;
42 }
43
44 #define CONSOLE_EXT_LOG_MAX 8192
45
46 /* printk's without a loglevel use this.. */
47 #define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT
48
49 /* We show everything that is MORE important than this.. */
50 #define CONSOLE_LOGLEVEL_SILENT 0 /* Mum's the word */
51 #define CONSOLE_LOGLEVEL_MIN 1 /* Minimum loglevel we let people use */
52 #define CONSOLE_LOGLEVEL_QUIET 4 /* Shhh ..., when booted with "quiet" */
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, we're now allowing it to be set from
58 * kernel config.
59 */
60 #define CONSOLE_LOGLEVEL_DEFAULT CONFIG_CONSOLE_LOGLEVEL_DEFAULT
61
62 extern int console_printk[];
63
64 #define console_loglevel (console_printk[0])
65 #define default_message_loglevel (console_printk[1])
66 #define minimum_console_loglevel (console_printk[2])
67 #define default_console_loglevel (console_printk[3])
68
69 static inline void console_silent(void)
70 {
71 console_loglevel = CONSOLE_LOGLEVEL_SILENT;
72 }
73
74 static inline void console_verbose(void)
75 {
76 if (console_loglevel)
77 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
78 }
79
80 /* strlen("ratelimit") + 1 */
81 #define DEVKMSG_STR_MAX_SIZE 10
82 extern char devkmsg_log_str[];
83 struct ctl_table;
84
85 struct 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 do { \
135 if (0) \
136 printk(fmt, ##__VA_ARGS__); \
137 } while (0); \
138 0; \
139 })
140
141 #ifdef CONFIG_EARLY_PRINTK
142 extern asmlinkage __printf(1, 2)
143 void early_printk(const char *fmt, ...);
144 #else
145 static inline __printf(1, 2) __cold
146 void early_printk(const char *s, ...) { }
147 #endif
148
149 #ifdef CONFIG_PRINTK_NMI
150 extern void printk_nmi_enter(void);
151 extern void printk_nmi_exit(void);
152 #else
153 static inline void printk_nmi_enter(void) { }
154 static inline void printk_nmi_exit(void) { }
155 #endif /* PRINTK_NMI */
156
157 #ifdef CONFIG_PRINTK
158 asmlinkage __printf(5, 0)
159 int vprintk_emit(int facility, int level,
160 const char *dict, size_t dictlen,
161 const char *fmt, va_list args);
162
163 asmlinkage __printf(1, 0)
164 int vprintk(const char *fmt, va_list args);
165
166 asmlinkage __printf(5, 6) __cold
167 int printk_emit(int facility, int level,
168 const char *dict, size_t dictlen,
169 const char *fmt, ...);
170
171 asmlinkage __printf(1, 2) __cold
172 int printk(const char *fmt, ...);
173
174 /*
175 * Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !
176 */
177 __printf(1, 2) __cold int printk_deferred(const char *fmt, ...);
178
179 /*
180 * Please don't use printk_ratelimit(), because it shares ratelimiting state
181 * with all other unrelated printk_ratelimit() callsites. Instead use
182 * printk_ratelimited() or plain old __ratelimit().
183 */
184 extern int __printk_ratelimit(const char *func);
185 #define printk_ratelimit() __printk_ratelimit(__func__)
186 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
187 unsigned int interval_msec);
188
189 extern int printk_delay_msec;
190 extern int dmesg_restrict;
191 extern int kptr_restrict;
192
193 extern int
194 devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, void __user *buf,
195 size_t *lenp, loff_t *ppos);
196
197 extern void wake_up_klogd(void);
198
199 char *log_buf_addr_get(void);
200 u32 log_buf_len_get(void);
201 void log_buf_vmcoreinfo_setup(void);
202 void __init setup_log_buf(int early);
203 __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
204 void dump_stack_print_info(const char *log_lvl);
205 void show_regs_print_info(const char *log_lvl);
206 extern void printk_safe_init(void);
207 extern void printk_safe_flush(void);
208 extern void printk_safe_flush_on_panic(void);
209 #else
210 static inline __printf(1, 0)
211 int vprintk(const char *s, va_list args)
212 {
213 return 0;
214 }
215 static inline __printf(1, 2) __cold
216 int printk(const char *s, ...)
217 {
218 return 0;
219 }
220 static inline __printf(1, 2) __cold
221 int printk_deferred(const char *s, ...)
222 {
223 return 0;
224 }
225 static inline int printk_ratelimit(void)
226 {
227 return 0;
228 }
229 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
230 unsigned int interval_msec)
231 {
232 return false;
233 }
234
235 static inline void wake_up_klogd(void)
236 {
237 }
238
239 static inline char *log_buf_addr_get(void)
240 {
241 return NULL;
242 }
243
244 static inline u32 log_buf_len_get(void)
245 {
246 return 0;
247 }
248
249 static inline void log_buf_vmcoreinfo_setup(void)
250 {
251 }
252
253 static inline void setup_log_buf(int early)
254 {
255 }
256
257 static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
258 {
259 }
260
261 static inline void dump_stack_print_info(const char *log_lvl)
262 {
263 }
264
265 static inline void show_regs_print_info(const char *log_lvl)
266 {
267 }
268
269 static inline void printk_safe_init(void)
270 {
271 }
272
273 static inline void printk_safe_flush(void)
274 {
275 }
276
277 static inline void printk_safe_flush_on_panic(void)
278 {
279 }
280 #endif
281
282 extern asmlinkage void dump_stack(void) __cold;
283
284 #ifndef pr_fmt
285 #define pr_fmt(fmt) fmt
286 #endif
287
288 #if defined(__KMSG_CHECKER) && defined(KMSG_COMPONENT)
289
290 /* generate magic string for scripts/kmsg-doc to parse */
291 #define pr_printk_hash(level, format, ...) \
292 __KMSG_PRINT(level _FMT_ format _ARGS_ __VA_ARGS__ _END_)
293
294 #elif defined(CONFIG_KMSG_IDS) && defined(KMSG_COMPONENT)
295
296 /* format element '%pj' prints the six digit jhash of a string */
297 #define _pr_printk_hash(pfx, fmt, ...) \
298 printk(pfx fmt, pfx fmt + __builtin_strlen(pfx), ##__VA_ARGS__)
299 #define pr_printk_hash(level, format, ...) \
300 _pr_printk_hash(level KMSG_COMPONENT ".%pj: ", format, ##__VA_ARGS__)
301
302 #else /* !defined(CONFIG_KMSG_IDS) */
303
304 #define pr_printk_hash(level, format, ...) \
305 printk(level pr_fmt(format), ##__VA_ARGS__)
306
307 #endif
308
309 /*
310 * These can be used to print at the various log levels.
311 * All of these will print unconditionally, although note that pr_debug()
312 * and other debug macros are compiled out unless either DEBUG is defined
313 * or CONFIG_DYNAMIC_DEBUG is set.
314 */
315 #define pr_emerg(fmt, ...) \
316 pr_printk_hash(KERN_EMERG, fmt, ##__VA_ARGS__)
317 #define pr_alert(fmt, ...) \
318 pr_printk_hash(KERN_ALERT, fmt, ##__VA_ARGS__)
319 #define pr_crit(fmt, ...) \
320 pr_printk_hash(KERN_CRIT, fmt, ##__VA_ARGS__)
321 #define pr_err(fmt, ...) \
322 pr_printk_hash(KERN_ERR, fmt, ##__VA_ARGS__)
323 #define pr_warning(fmt, ...) \
324 pr_printk_hash(KERN_WARNING, fmt, ##__VA_ARGS__)
325 #define pr_warn pr_warning
326 #define pr_notice(fmt, ...) \
327 pr_printk_hash(KERN_NOTICE, fmt, ##__VA_ARGS__)
328 #define pr_info(fmt, ...) \
329 pr_printk_hash(KERN_INFO, fmt, ##__VA_ARGS__)
330 /*
331 * Like KERN_CONT, pr_cont() should only be used when continuing
332 * a line with no newline ('\n') enclosed. Otherwise it defaults
333 * back to KERN_DEFAULT.
334 */
335 #define pr_cont(fmt, ...) \
336 printk(KERN_CONT fmt, ##__VA_ARGS__)
337
338 /* pr_devel() should produce zero code unless DEBUG is defined */
339 #ifdef DEBUG
340 #define pr_devel(fmt, ...) \
341 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
342 #else
343 #define pr_devel(fmt, ...) \
344 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
345 #endif
346
347
348 /* If you are writing a driver, please use dev_dbg instead */
349 #if defined(CONFIG_DYNAMIC_DEBUG)
350 #include <linux/dynamic_debug.h>
351
352 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
353 #define pr_debug(fmt, ...) \
354 dynamic_pr_debug(fmt, ##__VA_ARGS__)
355 #elif defined(DEBUG)
356 #define pr_debug(fmt, ...) \
357 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
358 #else
359 #define pr_debug(fmt, ...) \
360 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
361 #endif
362
363 /*
364 * Print a one-time message (analogous to WARN_ONCE() et al):
365 */
366
367 #ifdef CONFIG_PRINTK
368 #define printk_once(fmt, ...) \
369 ({ \
370 static bool __print_once __read_mostly; \
371 bool __ret_print_once = !__print_once; \
372 \
373 if (!__print_once) { \
374 __print_once = true; \
375 printk(fmt, ##__VA_ARGS__); \
376 } \
377 unlikely(__ret_print_once); \
378 })
379 #define printk_deferred_once(fmt, ...) \
380 ({ \
381 static bool __print_once __read_mostly; \
382 bool __ret_print_once = !__print_once; \
383 \
384 if (!__print_once) { \
385 __print_once = true; \
386 printk_deferred(fmt, ##__VA_ARGS__); \
387 } \
388 unlikely(__ret_print_once); \
389 })
390 #else
391 #define printk_once(fmt, ...) \
392 no_printk(fmt, ##__VA_ARGS__)
393 #define printk_deferred_once(fmt, ...) \
394 no_printk(fmt, ##__VA_ARGS__)
395 #endif
396
397 #define pr_emerg_once(fmt, ...) \
398 printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
399 #define pr_alert_once(fmt, ...) \
400 printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
401 #define pr_crit_once(fmt, ...) \
402 printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
403 #define pr_err_once(fmt, ...) \
404 printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
405 #define pr_warn_once(fmt, ...) \
406 printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
407 #define pr_notice_once(fmt, ...) \
408 printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
409 #define pr_info_once(fmt, ...) \
410 printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
411 #define pr_cont_once(fmt, ...) \
412 printk_once(KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
413
414 #if defined(DEBUG)
415 #define pr_devel_once(fmt, ...) \
416 printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
417 #else
418 #define pr_devel_once(fmt, ...) \
419 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
420 #endif
421
422 /* If you are writing a driver, please use dev_dbg instead */
423 #if defined(DEBUG)
424 #define pr_debug_once(fmt, ...) \
425 printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
426 #else
427 #define pr_debug_once(fmt, ...) \
428 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
429 #endif
430
431 /*
432 * ratelimited messages with local ratelimit_state,
433 * no local ratelimit_state used in the !PRINTK case
434 */
435 #ifdef CONFIG_PRINTK
436 #define printk_ratelimited(fmt, ...) \
437 ({ \
438 static DEFINE_RATELIMIT_STATE(_rs, \
439 DEFAULT_RATELIMIT_INTERVAL, \
440 DEFAULT_RATELIMIT_BURST); \
441 \
442 if (__ratelimit(&_rs)) \
443 printk(fmt, ##__VA_ARGS__); \
444 })
445 #else
446 #define printk_ratelimited(fmt, ...) \
447 no_printk(fmt, ##__VA_ARGS__)
448 #endif
449
450 #define pr_emerg_ratelimited(fmt, ...) \
451 printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
452 #define pr_alert_ratelimited(fmt, ...) \
453 printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
454 #define pr_crit_ratelimited(fmt, ...) \
455 printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
456 #define pr_err_ratelimited(fmt, ...) \
457 printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
458 #define pr_warn_ratelimited(fmt, ...) \
459 printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
460 #define pr_notice_ratelimited(fmt, ...) \
461 printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
462 #define pr_info_ratelimited(fmt, ...) \
463 printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
464 /* no pr_cont_ratelimited, don't do that... */
465
466 #if defined(DEBUG)
467 #define pr_devel_ratelimited(fmt, ...) \
468 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
469 #else
470 #define pr_devel_ratelimited(fmt, ...) \
471 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
472 #endif
473
474 /* If you are writing a driver, please use dev_dbg instead */
475 #if defined(CONFIG_DYNAMIC_DEBUG)
476 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
477 #define pr_debug_ratelimited(fmt, ...) \
478 do { \
479 static DEFINE_RATELIMIT_STATE(_rs, \
480 DEFAULT_RATELIMIT_INTERVAL, \
481 DEFAULT_RATELIMIT_BURST); \
482 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt)); \
483 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \
484 __ratelimit(&_rs)) \
485 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__); \
486 } while (0)
487 #elif defined(DEBUG)
488 #define pr_debug_ratelimited(fmt, ...) \
489 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
490 #else
491 #define pr_debug_ratelimited(fmt, ...) \
492 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
493 #endif
494
495 extern const struct file_operations kmsg_fops;
496
497 enum {
498 DUMP_PREFIX_NONE,
499 DUMP_PREFIX_ADDRESS,
500 DUMP_PREFIX_OFFSET
501 };
502 extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
503 int groupsize, char *linebuf, size_t linebuflen,
504 bool ascii);
505 #ifdef CONFIG_PRINTK
506 extern void print_hex_dump(const char *level, const char *prefix_str,
507 int prefix_type, int rowsize, int groupsize,
508 const void *buf, size_t len, bool ascii);
509 #if defined(CONFIG_DYNAMIC_DEBUG)
510 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
511 dynamic_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true)
512 #else
513 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
514 const void *buf, size_t len);
515 #endif /* defined(CONFIG_DYNAMIC_DEBUG) */
516 #else
517 static inline void print_hex_dump(const char *level, const char *prefix_str,
518 int prefix_type, int rowsize, int groupsize,
519 const void *buf, size_t len, bool ascii)
520 {
521 }
522 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
523 const void *buf, size_t len)
524 {
525 }
526
527 #endif
528
529 #if defined(CONFIG_DYNAMIC_DEBUG)
530 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
531 groupsize, buf, len, ascii) \
532 dynamic_hex_dump(prefix_str, prefix_type, rowsize, \
533 groupsize, buf, len, ascii)
534 #elif defined(DEBUG)
535 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
536 groupsize, buf, len, ascii) \
537 print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize, \
538 groupsize, buf, len, ascii)
539 #else
540 static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
541 int rowsize, int groupsize,
542 const void *buf, size_t len, bool ascii)
543 {
544 }
545 #endif
546
547 #endif