~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-4.15-rc3 ] ~ [ linux-4.14.5 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.68 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.105 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.47 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.87 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.51 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.96 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.27.62 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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_QUIET   4 /* Shhh ..., when booted with "quiet" */
 54 #define CONSOLE_LOGLEVEL_DEBUG  10 /* issue debug messages */
 55 #define CONSOLE_LOGLEVEL_MOTORMOUTH 15  /* You can't shut this one up */
 56 
 57 /*
 58  * Default used to be hard-coded at 7, we're now allowing it to be set from
 59  * kernel config.
 60  */
 61 #define CONSOLE_LOGLEVEL_DEFAULT CONFIG_CONSOLE_LOGLEVEL_DEFAULT
 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 #else
152 static inline void printk_nmi_enter(void) { }
153 static inline void printk_nmi_exit(void) { }
154 #endif /* PRINTK_NMI */
155 
156 #ifdef CONFIG_PRINTK
157 asmlinkage __printf(5, 0)
158 int vprintk_emit(int facility, int level,
159                  const char *dict, size_t dictlen,
160                  const char *fmt, va_list args);
161 
162 asmlinkage __printf(1, 0)
163 int vprintk(const char *fmt, va_list args);
164 
165 asmlinkage __printf(5, 6) __cold
166 int printk_emit(int facility, int level,
167                 const char *dict, size_t dictlen,
168                 const char *fmt, ...);
169 
170 asmlinkage __printf(1, 2) __cold
171 int printk(const char *fmt, ...);
172 
173 /*
174  * Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !
175  */
176 __printf(1, 2) __cold int printk_deferred(const char *fmt, ...);
177 
178 /*
179  * Please don't use printk_ratelimit(), because it shares ratelimiting state
180  * with all other unrelated printk_ratelimit() callsites.  Instead use
181  * printk_ratelimited() or plain old __ratelimit().
182  */
183 extern int __printk_ratelimit(const char *func);
184 #define printk_ratelimit() __printk_ratelimit(__func__)
185 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
186                                    unsigned int interval_msec);
187 
188 extern int printk_delay_msec;
189 extern int dmesg_restrict;
190 
191 extern int
192 devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, void __user *buf,
193                           size_t *lenp, loff_t *ppos);
194 
195 extern void wake_up_klogd(void);
196 
197 char *log_buf_addr_get(void);
198 u32 log_buf_len_get(void);
199 void log_buf_vmcoreinfo_setup(void);
200 void __init setup_log_buf(int early);
201 __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
202 void dump_stack_print_info(const char *log_lvl);
203 void show_regs_print_info(const char *log_lvl);
204 extern void printk_safe_init(void);
205 extern void printk_safe_flush(void);
206 extern void printk_safe_flush_on_panic(void);
207 #else
208 static inline __printf(1, 0)
209 int vprintk(const char *s, va_list args)
210 {
211         return 0;
212 }
213 static inline __printf(1, 2) __cold
214 int printk(const char *s, ...)
215 {
216         return 0;
217 }
218 static inline __printf(1, 2) __cold
219 int printk_deferred(const char *s, ...)
220 {
221         return 0;
222 }
223 static inline int printk_ratelimit(void)
224 {
225         return 0;
226 }
227 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
228                                           unsigned int interval_msec)
229 {
230         return false;
231 }
232 
233 static inline void wake_up_klogd(void)
234 {
235 }
236 
237 static inline char *log_buf_addr_get(void)
238 {
239         return NULL;
240 }
241 
242 static inline u32 log_buf_len_get(void)
243 {
244         return 0;
245 }
246 
247 static inline void log_buf_vmcoreinfo_setup(void)
248 {
249 }
250 
251 static inline void setup_log_buf(int early)
252 {
253 }
254 
255 static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
256 {
257 }
258 
259 static inline void dump_stack_print_info(const char *log_lvl)
260 {
261 }
262 
263 static inline void show_regs_print_info(const char *log_lvl)
264 {
265 }
266 
267 static inline void printk_safe_init(void)
268 {
269 }
270 
271 static inline void printk_safe_flush(void)
272 {
273 }
274 
275 static inline void printk_safe_flush_on_panic(void)
276 {
277 }
278 #endif
279 
280 extern int kptr_restrict;
281 
282 extern asmlinkage void dump_stack(void) __cold;
283 
284 #ifndef pr_fmt
285 #define pr_fmt(fmt) fmt
286 #endif
287 
288 /*
289  * These can be used to print at the various log levels.
290  * All of these will print unconditionally, although note that pr_debug()
291  * and other debug macros are compiled out unless either DEBUG is defined
292  * or CONFIG_DYNAMIC_DEBUG is set.
293  */
294 #define pr_emerg(fmt, ...) \
295         printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
296 #define pr_alert(fmt, ...) \
297         printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
298 #define pr_crit(fmt, ...) \
299         printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
300 #define pr_err(fmt, ...) \
301         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
302 #define pr_warning(fmt, ...) \
303         printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
304 #define pr_warn pr_warning
305 #define pr_notice(fmt, ...) \
306         printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
307 #define pr_info(fmt, ...) \
308         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
309 /*
310  * Like KERN_CONT, pr_cont() should only be used when continuing
311  * a line with no newline ('\n') enclosed. Otherwise it defaults
312  * back to KERN_DEFAULT.
313  */
314 #define pr_cont(fmt, ...) \
315         printk(KERN_CONT fmt, ##__VA_ARGS__)
316 
317 /* pr_devel() should produce zero code unless DEBUG is defined */
318 #ifdef DEBUG
319 #define pr_devel(fmt, ...) \
320         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
321 #else
322 #define pr_devel(fmt, ...) \
323         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
324 #endif
325 
326 
327 /* If you are writing a driver, please use dev_dbg instead */
328 #if defined(CONFIG_DYNAMIC_DEBUG)
329 #include <linux/dynamic_debug.h>
330 
331 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
332 #define pr_debug(fmt, ...) \
333         dynamic_pr_debug(fmt, ##__VA_ARGS__)
334 #elif defined(DEBUG)
335 #define pr_debug(fmt, ...) \
336         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
337 #else
338 #define pr_debug(fmt, ...) \
339         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
340 #endif
341 
342 /*
343  * Print a one-time message (analogous to WARN_ONCE() et al):
344  */
345 
346 #ifdef CONFIG_PRINTK
347 #define printk_once(fmt, ...)                                   \
348 ({                                                              \
349         static bool __print_once __read_mostly;                 \
350         bool __ret_print_once = !__print_once;                  \
351                                                                 \
352         if (!__print_once) {                                    \
353                 __print_once = true;                            \
354                 printk(fmt, ##__VA_ARGS__);                     \
355         }                                                       \
356         unlikely(__ret_print_once);                             \
357 })
358 #define printk_deferred_once(fmt, ...)                          \
359 ({                                                              \
360         static bool __print_once __read_mostly;                 \
361         bool __ret_print_once = !__print_once;                  \
362                                                                 \
363         if (!__print_once) {                                    \
364                 __print_once = true;                            \
365                 printk_deferred(fmt, ##__VA_ARGS__);            \
366         }                                                       \
367         unlikely(__ret_print_once);                             \
368 })
369 #else
370 #define printk_once(fmt, ...)                                   \
371         no_printk(fmt, ##__VA_ARGS__)
372 #define printk_deferred_once(fmt, ...)                          \
373         no_printk(fmt, ##__VA_ARGS__)
374 #endif
375 
376 #define pr_emerg_once(fmt, ...)                                 \
377         printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
378 #define pr_alert_once(fmt, ...)                                 \
379         printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
380 #define pr_crit_once(fmt, ...)                                  \
381         printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
382 #define pr_err_once(fmt, ...)                                   \
383         printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
384 #define pr_warn_once(fmt, ...)                                  \
385         printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
386 #define pr_notice_once(fmt, ...)                                \
387         printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
388 #define pr_info_once(fmt, ...)                                  \
389         printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
390 #define pr_cont_once(fmt, ...)                                  \
391         printk_once(KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
392 
393 #if defined(DEBUG)
394 #define pr_devel_once(fmt, ...)                                 \
395         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
396 #else
397 #define pr_devel_once(fmt, ...)                                 \
398         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
399 #endif
400 
401 /* If you are writing a driver, please use dev_dbg instead */
402 #if defined(DEBUG)
403 #define pr_debug_once(fmt, ...)                                 \
404         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
405 #else
406 #define pr_debug_once(fmt, ...)                                 \
407         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
408 #endif
409 
410 /*
411  * ratelimited messages with local ratelimit_state,
412  * no local ratelimit_state used in the !PRINTK case
413  */
414 #ifdef CONFIG_PRINTK
415 #define printk_ratelimited(fmt, ...)                                    \
416 ({                                                                      \
417         static DEFINE_RATELIMIT_STATE(_rs,                              \
418                                       DEFAULT_RATELIMIT_INTERVAL,       \
419                                       DEFAULT_RATELIMIT_BURST);         \
420                                                                         \
421         if (__ratelimit(&_rs))                                          \
422                 printk(fmt, ##__VA_ARGS__);                             \
423 })
424 #else
425 #define printk_ratelimited(fmt, ...)                                    \
426         no_printk(fmt, ##__VA_ARGS__)
427 #endif
428 
429 #define pr_emerg_ratelimited(fmt, ...)                                  \
430         printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
431 #define pr_alert_ratelimited(fmt, ...)                                  \
432         printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
433 #define pr_crit_ratelimited(fmt, ...)                                   \
434         printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
435 #define pr_err_ratelimited(fmt, ...)                                    \
436         printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
437 #define pr_warn_ratelimited(fmt, ...)                                   \
438         printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
439 #define pr_notice_ratelimited(fmt, ...)                                 \
440         printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
441 #define pr_info_ratelimited(fmt, ...)                                   \
442         printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
443 /* no pr_cont_ratelimited, don't do that... */
444 
445 #if defined(DEBUG)
446 #define pr_devel_ratelimited(fmt, ...)                                  \
447         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
448 #else
449 #define pr_devel_ratelimited(fmt, ...)                                  \
450         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
451 #endif
452 
453 /* If you are writing a driver, please use dev_dbg instead */
454 #if defined(CONFIG_DYNAMIC_DEBUG)
455 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
456 #define pr_debug_ratelimited(fmt, ...)                                  \
457 do {                                                                    \
458         static DEFINE_RATELIMIT_STATE(_rs,                              \
459                                       DEFAULT_RATELIMIT_INTERVAL,       \
460                                       DEFAULT_RATELIMIT_BURST);         \
461         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt));         \
462         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) &&        \
463             __ratelimit(&_rs))                                          \
464                 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__);    \
465 } while (0)
466 #elif defined(DEBUG)
467 #define pr_debug_ratelimited(fmt, ...)                                  \
468         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
469 #else
470 #define pr_debug_ratelimited(fmt, ...) \
471         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
472 #endif
473 
474 extern const struct file_operations kmsg_fops;
475 
476 enum {
477         DUMP_PREFIX_NONE,
478         DUMP_PREFIX_ADDRESS,
479         DUMP_PREFIX_OFFSET
480 };
481 extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
482                               int groupsize, char *linebuf, size_t linebuflen,
483                               bool ascii);
484 #ifdef CONFIG_PRINTK
485 extern void print_hex_dump(const char *level, const char *prefix_str,
486                            int prefix_type, int rowsize, int groupsize,
487                            const void *buf, size_t len, bool ascii);
488 #if defined(CONFIG_DYNAMIC_DEBUG)
489 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
490         dynamic_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true)
491 #else
492 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
493                                  const void *buf, size_t len);
494 #endif /* defined(CONFIG_DYNAMIC_DEBUG) */
495 #else
496 static inline void print_hex_dump(const char *level, const char *prefix_str,
497                                   int prefix_type, int rowsize, int groupsize,
498                                   const void *buf, size_t len, bool ascii)
499 {
500 }
501 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
502                                         const void *buf, size_t len)
503 {
504 }
505 
506 #endif
507 
508 #if defined(CONFIG_DYNAMIC_DEBUG)
509 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,  \
510                              groupsize, buf, len, ascii)        \
511         dynamic_hex_dump(prefix_str, prefix_type, rowsize,      \
512                          groupsize, buf, len, ascii)
513 #elif defined(DEBUG)
514 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,          \
515                              groupsize, buf, len, ascii)                \
516         print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize,    \
517                        groupsize, buf, len, ascii)
518 #else
519 static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
520                                         int rowsize, int groupsize,
521                                         const void *buf, size_t len, bool ascii)
522 {
523 }
524 #endif
525 
526 #endif
527 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp