1 #ifndef __KERNEL_PRINTK__
2 #define __KERNEL_PRINTK__
5 #include <linux/init.h>
6 #include <linux/kern_levels.h>
7 #include <linux/linkage.h>
8 #include <linux/cache.h>
10 extern const char linux_banner[];
11 extern const char linux_proc_banner[];
13 static inline int printk_get_level(const char *buffer)
15 if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
18 case 'd': /* KERN_DEFAULT */
19 case 'c': /* KERN_CONT */
26 static inline const char *printk_skip_level(const char *buffer)
28 if (printk_get_level(buffer))
34 #define CONSOLE_EXT_LOG_MAX 8192
36 /* printk's without a loglevel use this.. */
37 #define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT
39 /* We show everything that is MORE important than this.. */
40 #define CONSOLE_LOGLEVEL_SILENT 0 /* Mum's the word */
41 #define CONSOLE_LOGLEVEL_MIN 1 /* Minimum loglevel we let people use */
42 #define CONSOLE_LOGLEVEL_QUIET 4 /* Shhh ..., when booted with "quiet" */
43 #define CONSOLE_LOGLEVEL_DEFAULT 7 /* anything MORE serious than KERN_DEBUG */
44 #define CONSOLE_LOGLEVEL_DEBUG 10 /* issue debug messages */
45 #define CONSOLE_LOGLEVEL_MOTORMOUTH 15 /* You can't shut this one up */
47 extern int console_printk[];
49 #define console_loglevel (console_printk[0])
50 #define default_message_loglevel (console_printk[1])
51 #define minimum_console_loglevel (console_printk[2])
52 #define default_console_loglevel (console_printk[3])
54 static inline void console_silent(void)
56 console_loglevel = CONSOLE_LOGLEVEL_SILENT;
59 static inline void console_verbose(void)
62 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
65 /* strlen("ratelimit") + 1 */
66 #define DEVKMSG_STR_MAX_SIZE 10
67 extern char devkmsg_log_str[];
77 * Add this to a message where you are sure the firmware is buggy or behaves
78 * really stupid or out of spec. Be aware that the responsible BIOS developer
79 * should be able to fix this issue or at least get a concrete idea of the
80 * problem by reading your message without the need of looking at the kernel
83 * Use it for definite and high priority BIOS bugs.
86 * Use it for not that clear (e.g. could the kernel messed up things already?)
87 * and medium priority BIOS bugs.
90 * Use this one if you want to tell the user or vendor about something
91 * suspicious, but generally harmless related to the firmware.
93 * Use it for information or very low priority BIOS bugs.
95 #define FW_BUG "[Firmware Bug]: "
96 #define FW_WARN "[Firmware Warn]: "
97 #define FW_INFO "[Firmware Info]: "
101 * Add this to a message for hardware errors, so that user can report
102 * it to hardware vendor instead of LKML or software vendor.
104 #define HW_ERR "[Hardware Error]: "
108 * Add this to a message whenever you want to warn user space about the use
109 * of a deprecated aspect of an API so they can stop using it
111 #define DEPRECATED "[Deprecated]: "
114 * Dummy printk for disabled debugging statements to use whilst maintaining
115 * gcc's format checking.
117 #define no_printk(fmt, ...) \
121 printk(fmt, ##__VA_ARGS__); \
126 #ifdef CONFIG_EARLY_PRINTK
127 extern asmlinkage __printf(1, 2)
128 void early_printk(const char *fmt, ...);
129 extern void printk_kill(void);
131 static inline __printf(1, 2) __cold
132 void early_printk(const char *s, ...) { }
133 static inline void printk_kill(void) { }
136 #ifdef CONFIG_PRINTK_NMI
137 extern void printk_nmi_init(void);
138 extern void printk_nmi_enter(void);
139 extern void printk_nmi_exit(void);
140 extern void printk_nmi_flush(void);
141 extern void printk_nmi_flush_on_panic(void);
143 static inline void printk_nmi_init(void) { }
144 static inline void printk_nmi_enter(void) { }
145 static inline void printk_nmi_exit(void) { }
146 static inline void printk_nmi_flush(void) { }
147 static inline void printk_nmi_flush_on_panic(void) { }
148 #endif /* PRINTK_NMI */
151 asmlinkage __printf(5, 0)
152 int vprintk_emit(int facility, int level,
153 const char *dict, size_t dictlen,
154 const char *fmt, va_list args);
156 asmlinkage __printf(1, 0)
157 int vprintk(const char *fmt, va_list args);
159 asmlinkage __printf(5, 6) __cold
160 int printk_emit(int facility, int level,
161 const char *dict, size_t dictlen,
162 const char *fmt, ...);
164 asmlinkage __printf(1, 2) __cold
165 int printk(const char *fmt, ...);
168 * Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !
170 __printf(1, 2) __cold int printk_deferred(const char *fmt, ...);
173 * Please don't use printk_ratelimit(), because it shares ratelimiting state
174 * with all other unrelated printk_ratelimit() callsites. Instead use
175 * printk_ratelimited() or plain old __ratelimit().
177 extern int __printk_ratelimit(const char *func);
178 #define printk_ratelimit() __printk_ratelimit(__func__)
179 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
180 unsigned int interval_msec);
182 extern int printk_delay_msec;
183 extern int dmesg_restrict;
184 extern int kptr_restrict;
187 devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, void __user *buf,
188 size_t *lenp, loff_t *ppos);
190 extern void wake_up_klogd(void);
192 char *log_buf_addr_get(void);
193 u32 log_buf_len_get(void);
194 void log_buf_kexec_setup(void);
195 void __init setup_log_buf(int early);
196 __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
197 void dump_stack_print_info(const char *log_lvl);
198 void show_regs_print_info(const char *log_lvl);
200 static inline __printf(1, 0)
201 int vprintk(const char *s, va_list args)
205 static inline __printf(1, 2) __cold
206 int printk(const char *s, ...)
210 static inline __printf(1, 2) __cold
211 int printk_deferred(const char *s, ...)
215 static inline int printk_ratelimit(void)
219 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
220 unsigned int interval_msec)
225 static inline void wake_up_klogd(void)
229 static inline char *log_buf_addr_get(void)
234 static inline u32 log_buf_len_get(void)
239 static inline void log_buf_kexec_setup(void)
243 static inline void setup_log_buf(int early)
247 static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
251 static inline void dump_stack_print_info(const char *log_lvl)
255 static inline void show_regs_print_info(const char *log_lvl)
260 extern asmlinkage void dump_stack(void) __cold;
263 #define pr_fmt(fmt) fmt
267 * These can be used to print at the various log levels.
268 * All of these will print unconditionally, although note that pr_debug()
269 * and other debug macros are compiled out unless either DEBUG is defined
270 * or CONFIG_DYNAMIC_DEBUG is set.
272 #define pr_emerg(fmt, ...) \
273 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
274 #define pr_alert(fmt, ...) \
275 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
276 #define pr_crit(fmt, ...) \
277 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
278 #define pr_err(fmt, ...) \
279 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
280 #define pr_warning(fmt, ...) \
281 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
282 #define pr_warn pr_warning
283 #define pr_notice(fmt, ...) \
284 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
285 #define pr_info(fmt, ...) \
286 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
288 * Like KERN_CONT, pr_cont() should only be used when continuing
289 * a line with no newline ('\n') enclosed. Otherwise it defaults
290 * back to KERN_DEFAULT.
292 #define pr_cont(fmt, ...) \
293 printk(KERN_CONT fmt, ##__VA_ARGS__)
295 /* pr_devel() should produce zero code unless DEBUG is defined */
297 #define pr_devel(fmt, ...) \
298 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
300 #define pr_devel(fmt, ...) \
301 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
305 /* If you are writing a driver, please use dev_dbg instead */
306 #if defined(CONFIG_DYNAMIC_DEBUG)
307 #include <linux/dynamic_debug.h>
309 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
310 #define pr_debug(fmt, ...) \
311 dynamic_pr_debug(fmt, ##__VA_ARGS__)
313 #define pr_debug(fmt, ...) \
314 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
316 #define pr_debug(fmt, ...) \
317 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
321 * Print a one-time message (analogous to WARN_ONCE() et al):
325 #define printk_once(fmt, ...) \
327 static bool __print_once __read_mostly; \
328 bool __ret_print_once = !__print_once; \
330 if (!__print_once) { \
331 __print_once = true; \
332 printk(fmt, ##__VA_ARGS__); \
334 unlikely(__ret_print_once); \
336 #define printk_deferred_once(fmt, ...) \
338 static bool __print_once __read_mostly; \
339 bool __ret_print_once = !__print_once; \
341 if (!__print_once) { \
342 __print_once = true; \
343 printk_deferred(fmt, ##__VA_ARGS__); \
345 unlikely(__ret_print_once); \
348 #define printk_once(fmt, ...) \
349 no_printk(fmt, ##__VA_ARGS__)
350 #define printk_deferred_once(fmt, ...) \
351 no_printk(fmt, ##__VA_ARGS__)
354 #define pr_emerg_once(fmt, ...) \
355 printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
356 #define pr_alert_once(fmt, ...) \
357 printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
358 #define pr_crit_once(fmt, ...) \
359 printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
360 #define pr_err_once(fmt, ...) \
361 printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
362 #define pr_warn_once(fmt, ...) \
363 printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
364 #define pr_notice_once(fmt, ...) \
365 printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
366 #define pr_info_once(fmt, ...) \
367 printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
368 #define pr_cont_once(fmt, ...) \
369 printk_once(KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
372 #define pr_devel_once(fmt, ...) \
373 printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
375 #define pr_devel_once(fmt, ...) \
376 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
379 /* If you are writing a driver, please use dev_dbg instead */
381 #define pr_debug_once(fmt, ...) \
382 printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
384 #define pr_debug_once(fmt, ...) \
385 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
389 * ratelimited messages with local ratelimit_state,
390 * no local ratelimit_state used in the !PRINTK case
393 #define printk_ratelimited(fmt, ...) \
395 static DEFINE_RATELIMIT_STATE(_rs, \
396 DEFAULT_RATELIMIT_INTERVAL, \
397 DEFAULT_RATELIMIT_BURST); \
399 if (__ratelimit(&_rs)) \
400 printk(fmt, ##__VA_ARGS__); \
403 #define printk_ratelimited(fmt, ...) \
404 no_printk(fmt, ##__VA_ARGS__)
407 #define pr_emerg_ratelimited(fmt, ...) \
408 printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
409 #define pr_alert_ratelimited(fmt, ...) \
410 printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
411 #define pr_crit_ratelimited(fmt, ...) \
412 printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
413 #define pr_err_ratelimited(fmt, ...) \
414 printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
415 #define pr_warn_ratelimited(fmt, ...) \
416 printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
417 #define pr_notice_ratelimited(fmt, ...) \
418 printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
419 #define pr_info_ratelimited(fmt, ...) \
420 printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
421 /* no pr_cont_ratelimited, don't do that... */
424 #define pr_devel_ratelimited(fmt, ...) \
425 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
427 #define pr_devel_ratelimited(fmt, ...) \
428 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
431 /* If you are writing a driver, please use dev_dbg instead */
432 #if defined(CONFIG_DYNAMIC_DEBUG)
433 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
434 #define pr_debug_ratelimited(fmt, ...) \
436 static DEFINE_RATELIMIT_STATE(_rs, \
437 DEFAULT_RATELIMIT_INTERVAL, \
438 DEFAULT_RATELIMIT_BURST); \
439 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt)); \
440 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \
442 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__); \
445 #define pr_debug_ratelimited(fmt, ...) \
446 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
448 #define pr_debug_ratelimited(fmt, ...) \
449 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
452 extern const struct file_operations kmsg_fops;
459 extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
460 int groupsize, char *linebuf, size_t linebuflen,
463 extern void print_hex_dump(const char *level, const char *prefix_str,
464 int prefix_type, int rowsize, int groupsize,
465 const void *buf, size_t len, bool ascii);
466 #if defined(CONFIG_DYNAMIC_DEBUG)
467 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
468 dynamic_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true)
470 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
471 const void *buf, size_t len);
472 #endif /* defined(CONFIG_DYNAMIC_DEBUG) */
474 static inline void print_hex_dump(const char *level, const char *prefix_str,
475 int prefix_type, int rowsize, int groupsize,
476 const void *buf, size_t len, bool ascii)
479 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
480 const void *buf, size_t len)
486 #if defined(CONFIG_DYNAMIC_DEBUG)
487 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
488 groupsize, buf, len, ascii) \
489 dynamic_hex_dump(prefix_str, prefix_type, rowsize, \
490 groupsize, buf, len, ascii)
492 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
493 groupsize, buf, len, ascii) \
494 print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize, \
495 groupsize, buf, len, ascii)
497 static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
498 int rowsize, int groupsize,
499 const void *buf, size_t len, bool ascii)