Linux kernel mirror (for testing)
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linux
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
11extern const char linux_banner[];
12extern const char linux_proc_banner[];
13
14#define PRINTK_MAX_SINGLE_HEADER_LEN 2
15
16static inline int printk_get_level(const char *buffer)
17{
18 if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
19 switch (buffer[1]) {
20 case '0' ... '7':
21 case 'd': /* KERN_DEFAULT */
22 case 'c': /* KERN_CONT */
23 return buffer[1];
24 }
25 }
26 return 0;
27}
28
29static 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
37static 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
63extern 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
70static inline void console_silent(void)
71{
72 console_loglevel = CONSOLE_LOGLEVEL_SILENT;
73}
74
75static 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
83extern char devkmsg_log_str[];
84struct ctl_table;
85
86struct 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
141extern asmlinkage __printf(1, 2)
142void early_printk(const char *fmt, ...);
143#else
144static inline __printf(1, 2) __cold
145void early_printk(const char *s, ...) { }
146#endif
147
148#ifdef CONFIG_PRINTK_NMI
149extern void printk_nmi_enter(void);
150extern void printk_nmi_exit(void);
151#else
152static inline void printk_nmi_enter(void) { }
153static inline void printk_nmi_exit(void) { }
154#endif /* PRINTK_NMI */
155
156#ifdef CONFIG_PRINTK
157asmlinkage __printf(5, 0)
158int vprintk_emit(int facility, int level,
159 const char *dict, size_t dictlen,
160 const char *fmt, va_list args);
161
162asmlinkage __printf(1, 0)
163int vprintk(const char *fmt, va_list args);
164
165asmlinkage __printf(5, 6) __cold
166int printk_emit(int facility, int level,
167 const char *dict, size_t dictlen,
168 const char *fmt, ...);
169
170asmlinkage __printf(1, 2) __cold
171int 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 */
183extern int __printk_ratelimit(const char *func);
184#define printk_ratelimit() __printk_ratelimit(__func__)
185extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
186 unsigned int interval_msec);
187
188extern int printk_delay_msec;
189extern int dmesg_restrict;
190
191extern int
192devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, void __user *buf,
193 size_t *lenp, loff_t *ppos);
194
195extern void wake_up_klogd(void);
196
197char *log_buf_addr_get(void);
198u32 log_buf_len_get(void);
199void log_buf_vmcoreinfo_setup(void);
200void __init setup_log_buf(int early);
201__printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
202void dump_stack_print_info(const char *log_lvl);
203void show_regs_print_info(const char *log_lvl);
204extern void printk_safe_init(void);
205extern void printk_safe_flush(void);
206extern void printk_safe_flush_on_panic(void);
207#else
208static inline __printf(1, 0)
209int vprintk(const char *s, va_list args)
210{
211 return 0;
212}
213static inline __printf(1, 2) __cold
214int printk(const char *s, ...)
215{
216 return 0;
217}
218static inline __printf(1, 2) __cold
219int printk_deferred(const char *s, ...)
220{
221 return 0;
222}
223static inline int printk_ratelimit(void)
224{
225 return 0;
226}
227static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
228 unsigned int interval_msec)
229{
230 return false;
231}
232
233static inline void wake_up_klogd(void)
234{
235}
236
237static inline char *log_buf_addr_get(void)
238{
239 return NULL;
240}
241
242static inline u32 log_buf_len_get(void)
243{
244 return 0;
245}
246
247static inline void log_buf_vmcoreinfo_setup(void)
248{
249}
250
251static inline void setup_log_buf(int early)
252{
253}
254
255static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
256{
257}
258
259static inline void dump_stack_print_info(const char *log_lvl)
260{
261}
262
263static inline void show_regs_print_info(const char *log_lvl)
264{
265}
266
267static inline void printk_safe_init(void)
268{
269}
270
271static inline void printk_safe_flush(void)
272{
273}
274
275static inline void printk_safe_flush_on_panic(void)
276{
277}
278#endif
279
280extern int kptr_restrict;
281
282extern 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, ...) \
457do { \
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
474extern const struct file_operations kmsg_fops;
475
476enum {
477 DUMP_PREFIX_NONE,
478 DUMP_PREFIX_ADDRESS,
479 DUMP_PREFIX_OFFSET
480};
481extern 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
485extern 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
492extern 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
496static 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}
501static 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
519static 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