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TOMOYO Linux Cross Reference
Linux/include/linux/printk.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef __KERNEL_PRINTK__
  3 #define __KERNEL_PRINTK__
  4 
  5 #include <stdarg.h>
  6 #include <linux/init.h>
  7 #include <linux/kern_levels.h>
  8 #include <linux/linkage.h>
  9 #include <linux/cache.h>
 10 
 11 extern const char linux_banner[];
 12 extern const char linux_proc_banner[];
 13 
 14 #define PRINTK_MAX_SINGLE_HEADER_LEN 2
 15 
 16 static inline int printk_get_level(const char *buffer)
 17 {
 18         if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
 19                 switch (buffer[1]) {
 20                 case '' ... '7':
 21                 case 'd':       /* KERN_DEFAULT */
 22                 case 'c':       /* KERN_CONT */
 23                         return buffer[1];
 24                 }
 25         }
 26         return 0;
 27 }
 28 
 29 static inline const char *printk_skip_level(const char *buffer)
 30 {
 31         if (printk_get_level(buffer))
 32                 return buffer + 2;
 33 
 34         return buffer;
 35 }
 36 
 37 static inline const char *printk_skip_headers(const char *buffer)
 38 {
 39         while (printk_get_level(buffer))
 40                 buffer = printk_skip_level(buffer);
 41 
 42         return buffer;
 43 }
 44 
 45 #define CONSOLE_EXT_LOG_MAX     8192
 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 static inline void console_silent(void)
 71 {
 72         console_loglevel = CONSOLE_LOGLEVEL_SILENT;
 73 }
 74 
 75 static inline void console_verbose(void)
 76 {
 77         if (console_loglevel)
 78                 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
 79 }
 80 
 81 /* strlen("ratelimit") + 1 */
 82 #define DEVKMSG_STR_MAX_SIZE 10
 83 extern char devkmsg_log_str[];
 84 struct ctl_table;
 85 
 86 struct va_format {
 87         const char *fmt;
 88         va_list *va;
 89 };
 90 
 91 /*
 92  * FW_BUG
 93  * Add this to a message where you are sure the firmware is buggy or behaves
 94  * really stupid or out of spec. Be aware that the responsible BIOS developer
 95  * should be able to fix this issue or at least get a concrete idea of the
 96  * problem by reading your message without the need of looking at the kernel
 97  * code.
 98  *
 99  * Use it for definite and high priority BIOS bugs.
100  *
101  * FW_WARN
102  * Use it for not that clear (e.g. could the kernel messed up things already?)
103  * and medium priority BIOS bugs.
104  *
105  * FW_INFO
106  * Use this one if you want to tell the user or vendor about something
107  * suspicious, but generally harmless related to the firmware.
108  *
109  * Use it for information or very low priority BIOS bugs.
110  */
111 #define FW_BUG          "[Firmware Bug]: "
112 #define FW_WARN         "[Firmware Warn]: "
113 #define FW_INFO         "[Firmware Info]: "
114 
115 /*
116  * HW_ERR
117  * Add this to a message for hardware errors, so that user can report
118  * it to hardware vendor instead of LKML or software vendor.
119  */
120 #define HW_ERR          "[Hardware Error]: "
121 
122 /*
123  * DEPRECATED
124  * Add this to a message whenever you want to warn user space about the use
125  * of a deprecated aspect of an API so they can stop using it
126  */
127 #define DEPRECATED      "[Deprecated]: "
128 
129 /*
130  * Dummy printk for disabled debugging statements to use whilst maintaining
131  * gcc's format checking.
132  */
133 #define no_printk(fmt, ...)                             \
134 ({                                                      \
135         if (0)                                          \
136                 printk(fmt, ##__VA_ARGS__);             \
137         0;                                              \
138 })
139 
140 #ifdef CONFIG_EARLY_PRINTK
141 extern asmlinkage __printf(1, 2)
142 void early_printk(const char *fmt, ...);
143 #else
144 static inline __printf(1, 2) __cold
145 void early_printk(const char *s, ...) { }
146 #endif
147 
148 #ifdef CONFIG_PRINTK_NMI
149 extern void printk_nmi_enter(void);
150 extern void printk_nmi_exit(void);
151 extern void printk_nmi_direct_enter(void);
152 extern void printk_nmi_direct_exit(void);
153 #else
154 static inline void printk_nmi_enter(void) { }
155 static inline void printk_nmi_exit(void) { }
156 static inline void printk_nmi_direct_enter(void) { }
157 static inline void printk_nmi_direct_exit(void) { }
158 #endif /* PRINTK_NMI */
159 
160 #ifdef CONFIG_PRINTK
161 asmlinkage __printf(5, 0)
162 int vprintk_emit(int facility, int level,
163                  const char *dict, size_t dictlen,
164                  const char *fmt, va_list args);
165 
166 asmlinkage __printf(1, 0)
167 int vprintk(const char *fmt, va_list args);
168 
169 asmlinkage __printf(5, 6) __cold
170 int printk_emit(int facility, int level,
171                 const char *dict, size_t dictlen,
172                 const char *fmt, ...);
173 
174 asmlinkage __printf(1, 2) __cold
175 int printk(const char *fmt, ...);
176 
177 /*
178  * Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !
179  */
180 __printf(1, 2) __cold int printk_deferred(const char *fmt, ...);
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  */
187 extern int __printk_ratelimit(const char *func);
188 #define printk_ratelimit() __printk_ratelimit(__func__)
189 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
190                                    unsigned int interval_msec);
191 
192 extern int printk_delay_msec;
193 extern int dmesg_restrict;
194 
195 extern int
196 devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, void __user *buf,
197                           size_t *lenp, loff_t *ppos);
198 
199 extern void wake_up_klogd(void);
200 
201 char *log_buf_addr_get(void);
202 u32 log_buf_len_get(void);
203 void log_buf_vmcoreinfo_setup(void);
204 void __init setup_log_buf(int early);
205 __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
206 void dump_stack_print_info(const char *log_lvl);
207 void show_regs_print_info(const char *log_lvl);
208 extern asmlinkage void dump_stack(void) __cold;
209 extern void printk_safe_init(void);
210 extern void printk_safe_flush(void);
211 extern void printk_safe_flush_on_panic(void);
212 #else
213 static inline __printf(1, 0)
214 int vprintk(const char *s, va_list args)
215 {
216         return 0;
217 }
218 static inline __printf(1, 2) __cold
219 int printk(const char *s, ...)
220 {
221         return 0;
222 }
223 static inline __printf(1, 2) __cold
224 int printk_deferred(const char *s, ...)
225 {
226         return 0;
227 }
228 static inline int printk_ratelimit(void)
229 {
230         return 0;
231 }
232 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
233                                           unsigned int interval_msec)
234 {
235         return false;
236 }
237 
238 static inline void wake_up_klogd(void)
239 {
240 }
241 
242 static inline char *log_buf_addr_get(void)
243 {
244         return NULL;
245 }
246 
247 static inline u32 log_buf_len_get(void)
248 {
249         return 0;
250 }
251 
252 static inline void log_buf_vmcoreinfo_setup(void)
253 {
254 }
255 
256 static inline void setup_log_buf(int early)
257 {
258 }
259 
260 static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
261 {
262 }
263 
264 static inline void dump_stack_print_info(const char *log_lvl)
265 {
266 }
267 
268 static inline void show_regs_print_info(const char *log_lvl)
269 {
270 }
271 
272 static inline asmlinkage void dump_stack(void)
273 {
274 }
275 
276 static inline void printk_safe_init(void)
277 {
278 }
279 
280 static inline void printk_safe_flush(void)
281 {
282 }
283 
284 static inline void printk_safe_flush_on_panic(void)
285 {
286 }
287 #endif
288 
289 extern int kptr_restrict;
290 
291 #ifndef pr_fmt
292 #define pr_fmt(fmt) fmt
293 #endif
294 
295 /*
296  * These can be used to print at the various log levels.
297  * All of these will print unconditionally, although note that pr_debug()
298  * and other debug macros are compiled out unless either DEBUG is defined
299  * or CONFIG_DYNAMIC_DEBUG is set.
300  */
301 #define pr_emerg(fmt, ...) \
302         printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
303 #define pr_alert(fmt, ...) \
304         printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
305 #define pr_crit(fmt, ...) \
306         printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
307 #define pr_err(fmt, ...) \
308         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
309 #define pr_warning(fmt, ...) \
310         printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
311 #define pr_warn pr_warning
312 #define pr_notice(fmt, ...) \
313         printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
314 #define pr_info(fmt, ...) \
315         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
316 /*
317  * Like KERN_CONT, pr_cont() should only be used when continuing
318  * a line with no newline ('\n') enclosed. Otherwise it defaults
319  * back to KERN_DEFAULT.
320  */
321 #define pr_cont(fmt, ...) \
322         printk(KERN_CONT fmt, ##__VA_ARGS__)
323 
324 /* pr_devel() should produce zero code unless DEBUG is defined */
325 #ifdef DEBUG
326 #define pr_devel(fmt, ...) \
327         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
328 #else
329 #define pr_devel(fmt, ...) \
330         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
331 #endif
332 
333 
334 /* If you are writing a driver, please use dev_dbg instead */
335 #if defined(CONFIG_DYNAMIC_DEBUG)
336 #include <linux/dynamic_debug.h>
337 
338 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
339 #define pr_debug(fmt, ...) \
340         dynamic_pr_debug(fmt, ##__VA_ARGS__)
341 #elif defined(DEBUG)
342 #define pr_debug(fmt, ...) \
343         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
344 #else
345 #define pr_debug(fmt, ...) \
346         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
347 #endif
348 
349 /*
350  * Print a one-time message (analogous to WARN_ONCE() et al):
351  */
352 
353 #ifdef CONFIG_PRINTK
354 #define printk_once(fmt, ...)                                   \
355 ({                                                              \
356         static bool __print_once __read_mostly;                 \
357         bool __ret_print_once = !__print_once;                  \
358                                                                 \
359         if (!__print_once) {                                    \
360                 __print_once = true;                            \
361                 printk(fmt, ##__VA_ARGS__);                     \
362         }                                                       \
363         unlikely(__ret_print_once);                             \
364 })
365 #define printk_deferred_once(fmt, ...)                          \
366 ({                                                              \
367         static bool __print_once __read_mostly;                 \
368         bool __ret_print_once = !__print_once;                  \
369                                                                 \
370         if (!__print_once) {                                    \
371                 __print_once = true;                            \
372                 printk_deferred(fmt, ##__VA_ARGS__);            \
373         }                                                       \
374         unlikely(__ret_print_once);                             \
375 })
376 #else
377 #define printk_once(fmt, ...)                                   \
378         no_printk(fmt, ##__VA_ARGS__)
379 #define printk_deferred_once(fmt, ...)                          \
380         no_printk(fmt, ##__VA_ARGS__)
381 #endif
382 
383 #define pr_emerg_once(fmt, ...)                                 \
384         printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
385 #define pr_alert_once(fmt, ...)                                 \
386         printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
387 #define pr_crit_once(fmt, ...)                                  \
388         printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
389 #define pr_err_once(fmt, ...)                                   \
390         printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
391 #define pr_warn_once(fmt, ...)                                  \
392         printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
393 #define pr_notice_once(fmt, ...)                                \
394         printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
395 #define pr_info_once(fmt, ...)                                  \
396         printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
397 #define pr_cont_once(fmt, ...)                                  \
398         printk_once(KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
399 
400 #if defined(DEBUG)
401 #define pr_devel_once(fmt, ...)                                 \
402         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
403 #else
404 #define pr_devel_once(fmt, ...)                                 \
405         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
406 #endif
407 
408 /* If you are writing a driver, please use dev_dbg instead */
409 #if defined(DEBUG)
410 #define pr_debug_once(fmt, ...)                                 \
411         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
412 #else
413 #define pr_debug_once(fmt, ...)                                 \
414         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
415 #endif
416 
417 /*
418  * ratelimited messages with local ratelimit_state,
419  * no local ratelimit_state used in the !PRINTK case
420  */
421 #ifdef CONFIG_PRINTK
422 #define printk_ratelimited(fmt, ...)                                    \
423 ({                                                                      \
424         static DEFINE_RATELIMIT_STATE(_rs,                              \
425                                       DEFAULT_RATELIMIT_INTERVAL,       \
426                                       DEFAULT_RATELIMIT_BURST);         \
427                                                                         \
428         if (__ratelimit(&_rs))                                          \
429                 printk(fmt, ##__VA_ARGS__);                             \
430 })
431 #else
432 #define printk_ratelimited(fmt, ...)                                    \
433         no_printk(fmt, ##__VA_ARGS__)
434 #endif
435 
436 #define pr_emerg_ratelimited(fmt, ...)                                  \
437         printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
438 #define pr_alert_ratelimited(fmt, ...)                                  \
439         printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
440 #define pr_crit_ratelimited(fmt, ...)                                   \
441         printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
442 #define pr_err_ratelimited(fmt, ...)                                    \
443         printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
444 #define pr_warn_ratelimited(fmt, ...)                                   \
445         printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
446 #define pr_notice_ratelimited(fmt, ...)                                 \
447         printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
448 #define pr_info_ratelimited(fmt, ...)                                   \
449         printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
450 /* no pr_cont_ratelimited, don't do that... */
451 
452 #if defined(DEBUG)
453 #define pr_devel_ratelimited(fmt, ...)                                  \
454         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
455 #else
456 #define pr_devel_ratelimited(fmt, ...)                                  \
457         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
458 #endif
459 
460 /* If you are writing a driver, please use dev_dbg instead */
461 #if defined(CONFIG_DYNAMIC_DEBUG)
462 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
463 #define pr_debug_ratelimited(fmt, ...)                                  \
464 do {                                                                    \
465         static DEFINE_RATELIMIT_STATE(_rs,                              \
466                                       DEFAULT_RATELIMIT_INTERVAL,       \
467                                       DEFAULT_RATELIMIT_BURST);         \
468         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt));         \
469         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) &&        \
470             __ratelimit(&_rs))                                          \
471                 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__);    \
472 } while (0)
473 #elif defined(DEBUG)
474 #define pr_debug_ratelimited(fmt, ...)                                  \
475         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
476 #else
477 #define pr_debug_ratelimited(fmt, ...) \
478         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
479 #endif
480 
481 extern const struct file_operations kmsg_fops;
482 
483 enum {
484         DUMP_PREFIX_NONE,
485         DUMP_PREFIX_ADDRESS,
486         DUMP_PREFIX_OFFSET
487 };
488 extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
489                               int groupsize, char *linebuf, size_t linebuflen,
490                               bool ascii);
491 #ifdef CONFIG_PRINTK
492 extern void print_hex_dump(const char *level, const char *prefix_str,
493                            int prefix_type, int rowsize, int groupsize,
494                            const void *buf, size_t len, bool ascii);
495 #if defined(CONFIG_DYNAMIC_DEBUG)
496 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
497         dynamic_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true)
498 #else
499 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
500                                  const void *buf, size_t len);
501 #endif /* defined(CONFIG_DYNAMIC_DEBUG) */
502 #else
503 static inline void print_hex_dump(const char *level, const char *prefix_str,
504                                   int prefix_type, int rowsize, int groupsize,
505                                   const void *buf, size_t len, bool ascii)
506 {
507 }
508 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
509                                         const void *buf, size_t len)
510 {
511 }
512 
513 #endif
514 
515 #if defined(CONFIG_DYNAMIC_DEBUG)
516 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,  \
517                              groupsize, buf, len, ascii)        \
518         dynamic_hex_dump(prefix_str, prefix_type, rowsize,      \
519                          groupsize, buf, len, ascii)
520 #elif defined(DEBUG)
521 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,          \
522                              groupsize, buf, len, ascii)                \
523         print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize,    \
524                        groupsize, buf, len, ascii)
525 #else
526 static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
527                                         int rowsize, int groupsize,
528                                         const void *buf, size_t len, bool ascii)
529 {
530 }
531 #endif
532 
533 #endif
534 

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