include/linux/printk.h

   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 static inline int printk_get_level(const char *buffer)
  14 {
  15         if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
  16                 switch (buffer[1]) {
  17                 case '0' ... '7':
  18                 case 'd':       /* KERN_DEFAULT */
  19                         return buffer[1];
  20                 }
  21         }
  22         return 0;
  23 }
  24
  25 static inline const char *printk_skip_level(const char *buffer)
  26 {
  27         if (printk_get_level(buffer))
  28                 return buffer + 2;
  29
  30         return buffer;
  31 }
  32
  33 #define CONSOLE_EXT_LOG_MAX     8192
  34
  35 /* printk's without a loglevel use this.. */
  36 #define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT
  37
  38 /* We show everything that is MORE important than this.. */
  39 #define CONSOLE_LOGLEVEL_SILENT  0 /* Mum's the word */
  40 #define CONSOLE_LOGLEVEL_MIN     1 /* Minimum loglevel we let people use */
  41 #define CONSOLE_LOGLEVEL_QUIET   4 /* Shhh ..., when booted with "quiet" */
  42 #define CONSOLE_LOGLEVEL_DEFAULT 7 /* anything MORE serious than KERN_DEBUG */
  43 #define CONSOLE_LOGLEVEL_DEBUG  10 /* issue debug messages */
  44 #define CONSOLE_LOGLEVEL_MOTORMOUTH 15  /* You can't shut this one up */
  45
  46 extern int console_printk[];
  47
  48 #define console_loglevel (console_printk[0])
  49 #define default_message_loglevel (console_printk[1])
  50 #define minimum_console_loglevel (console_printk[2])
  51 #define default_console_loglevel (console_printk[3])
  52
  53 static inline void console_silent(void)
  54 {
  55         console_loglevel = CONSOLE_LOGLEVEL_SILENT;
  56 }
  57
  58 static inline void console_verbose(void)
  59 {
  60         if (console_loglevel)
  61                 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
  62 }
  63
  64 struct va_format {
  65         const char *fmt;
  66         va_list *va;
  67 };
  68
  69 /*
  70  * FW_BUG
  71  * Add this to a message where you are sure the firmware is buggy or behaves
  72  * really stupid or out of spec. Be aware that the responsible BIOS developer
  73  * should be able to fix this issue or at least get a concrete idea of the
  74  * problem by reading your message without the need of looking at the kernel
  75  * code.
  76  *
  77  * Use it for definite and high priority BIOS bugs.
  78  *
  79  * FW_WARN
  80  * Use it for not that clear (e.g. could the kernel messed up things already?)
  81  * and medium priority BIOS bugs.
  82  *
  83  * FW_INFO
  84  * Use this one if you want to tell the user or vendor about something
  85  * suspicious, but generally harmless related to the firmware.
  86  *
  87  * Use it for information or very low priority BIOS bugs.
  88  */
  89 #define FW_BUG          "[Firmware Bug]: "
  90 #define FW_WARN         "[Firmware Warn]: "
  91 #define FW_INFO         "[Firmware Info]: "
  92
  93 /*
  94  * HW_ERR
  95  * Add this to a message for hardware errors, so that user can report
  96  * it to hardware vendor instead of LKML or software vendor.
  97  */
  98 #define HW_ERR          "[Hardware Error]: "
  99
 100 /*
 101  * DEPRECATED
 102  * Add this to a message whenever you want to warn user space about the use
 103  * of a deprecated aspect of an API so they can stop using it
 104  */
 105 #define DEPRECATED      "[Deprecated]: "
 106
 107 /*
 108  * Dummy printk for disabled debugging statements to use whilst maintaining
 109  * gcc's format checking.
 110  */
 111 #define no_printk(fmt, ...)                     \
 112 do {                                            \
 113         if (0)                                  \
 114                 printk(fmt, ##__VA_ARGS__);     \
 115 } while (0)
 116
 117 #ifdef CONFIG_EARLY_PRINTK
 118 extern asmlinkage __printf(1, 2)
 119 void early_printk(const char *fmt, ...);
 120 #else
 121 static inline __printf(1, 2) __cold
 122 void early_printk(const char *s, ...) { }
 123 #endif
 124
 125 #ifdef CONFIG_PRINTK_NMI
 126 extern void printk_nmi_init(void);
 127 extern void printk_nmi_enter(void);
 128 extern void printk_nmi_exit(void);
 129 extern void printk_nmi_flush(void);
 130 extern void printk_nmi_flush_on_panic(void);
 131 #else
 132 static inline void printk_nmi_init(void) { }
 133 static inline void printk_nmi_enter(void) { }
 134 static inline void printk_nmi_exit(void) { }
 135 static inline void printk_nmi_flush(void) { }
 136 static inline void printk_nmi_flush_on_panic(void) { }
 137 #endif /* PRINTK_NMI */
 138
 139 #ifdef CONFIG_PRINTK
 140 asmlinkage __printf(5, 0)
 141 int vprintk_emit(int facility, int level,
 142                  const char *dict, size_t dictlen,
 143                  const char *fmt, va_list args);
 144
 145 asmlinkage __printf(1, 0)
 146 int vprintk(const char *fmt, va_list args);
 147
 148 asmlinkage __printf(5, 6) __cold
 149 int printk_emit(int facility, int level,
 150                 const char *dict, size_t dictlen,
 151                 const char *fmt, ...);
 152
 153 asmlinkage __printf(1, 2) __cold
 154 int printk(const char *fmt, ...);
 155
 156 /*
 157  * Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !
 158  */
 159 __printf(1, 2) __cold int printk_deferred(const char *fmt, ...);
 160
 161 /*
 162  * Please don't use printk_ratelimit(), because it shares ratelimiting state
 163  * with all other unrelated printk_ratelimit() callsites.  Instead use
 164  * printk_ratelimited() or plain old __ratelimit().
 165  */
 166 extern int __printk_ratelimit(const char *func);
 167 #define printk_ratelimit() __printk_ratelimit(__func__)
 168 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 169                                    unsigned int interval_msec);
 170
 171 extern int printk_delay_msec;
 172 extern int dmesg_restrict;
 173 extern int kptr_restrict;
 174
 175 extern void wake_up_klogd(void);
 176
 177 char *log_buf_addr_get(void);
 178 u32 log_buf_len_get(void);
 179 void log_buf_kexec_setup(void);
 180 void __init setup_log_buf(int early);
 181 __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
 182 void dump_stack_print_info(const char *log_lvl);
 183 void show_regs_print_info(const char *log_lvl);
 184 #else
 185 static inline __printf(1, 0)
 186 int vprintk(const char *s, va_list args)
 187 {
 188         return 0;
 189 }
 190 static inline __printf(1, 2) __cold
 191 int printk(const char *s, ...)
 192 {
 193         return 0;
 194 }
 195 static inline __printf(1, 2) __cold
 196 int printk_deferred(const char *s, ...)
 197 {
 198         return 0;
 199 }
 200 static inline int printk_ratelimit(void)
 201 {
 202         return 0;
 203 }
 204 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 205                                           unsigned int interval_msec)
 206 {
 207         return false;
 208 }
 209
 210 static inline void wake_up_klogd(void)
 211 {
 212 }
 213
 214 static inline char *log_buf_addr_get(void)
 215 {
 216         return NULL;
 217 }
 218
 219 static inline u32 log_buf_len_get(void)
 220 {
 221         return 0;
 222 }
 223
 224 static inline void log_buf_kexec_setup(void)
 225 {
 226 }
 227
 228 static inline void setup_log_buf(int early)
 229 {
 230 }
 231
 232 static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
 233 {
 234 }
 235
 236 static inline void dump_stack_print_info(const char *log_lvl)
 237 {
 238 }
 239
 240 static inline void show_regs_print_info(const char *log_lvl)
 241 {
 242 }
 243 #endif
 244
 245 extern asmlinkage void dump_stack(void) __cold;
 246
 247 #ifndef pr_fmt
 248 #define pr_fmt(fmt) fmt
 249 #endif
 250
 251 /*
 252  * These can be used to print at the various log levels.
 253  * All of these will print unconditionally, although note that pr_debug()
 254  * and other debug macros are compiled out unless either DEBUG is defined
 255  * or CONFIG_DYNAMIC_DEBUG is set.
 256  */
 257 #define pr_emerg(fmt, ...) \
 258         printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 259 #define pr_alert(fmt, ...) \
 260         printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 261 #define pr_crit(fmt, ...) \
 262         printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 263 #define pr_err(fmt, ...) \
 264         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 265 #define pr_warning(fmt, ...) \
 266         printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 267 #define pr_warn pr_warning
 268 #define pr_notice(fmt, ...) \
 269         printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 270 #define pr_info(fmt, ...) \
 271         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 272 /*
 273  * Like KERN_CONT, pr_cont() should only be used when continuing
 274  * a line with no newline ('\n') enclosed. Otherwise it defaults
 275  * back to KERN_DEFAULT.
 276  */
 277 #define pr_cont(fmt, ...) \
 278         printk(KERN_CONT fmt, ##__VA_ARGS__)
 279
 280 /* pr_devel() should produce zero code unless DEBUG is defined */
 281 #ifdef DEBUG
 282 #define pr_devel(fmt, ...) \
 283         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 284 #else
 285 #define pr_devel(fmt, ...) \
 286         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 287 #endif
 288
 289 #include <linux/dynamic_debug.h>
 290
 291 /* If you are writing a driver, please use dev_dbg instead */
 292 #if defined(CONFIG_DYNAMIC_DEBUG)
 293 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
 294 #define pr_debug(fmt, ...) \
 295         dynamic_pr_debug(fmt, ##__VA_ARGS__)
 296 #elif defined(DEBUG)
 297 #define pr_debug(fmt, ...) \
 298         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 299 #else
 300 #define pr_debug(fmt, ...) \
 301         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 302 #endif
 303
 304 /*
 305  * Print a one-time message (analogous to WARN_ONCE() et al):
 306  */
 307
 308 #ifdef CONFIG_PRINTK
 309 #define printk_once(fmt, ...)                                   \
 310 ({                                                              \
 311         static bool __print_once __read_mostly;                 \
 312                                                                 \
 313         if (!__print_once) {                                    \
 314                 __print_once = true;                            \
 315                 printk(fmt, ##__VA_ARGS__);                     \
 316         }                                                       \
 317 })
 318 #define printk_deferred_once(fmt, ...)                          \
 319 ({                                                              \
 320         static bool __print_once __read_mostly;                 \
 321                                                                 \
 322         if (!__print_once) {                                    \
 323                 __print_once = true;                            \
 324                 printk_deferred(fmt, ##__VA_ARGS__);            \
 325         }                                                       \
 326 })
 327 #else
 328 #define printk_once(fmt, ...)                                   \
 329         no_printk(fmt, ##__VA_ARGS__)
 330 #define printk_deferred_once(fmt, ...)                          \
 331         no_printk(fmt, ##__VA_ARGS__)
 332 #endif
 333
 334 #define pr_emerg_once(fmt, ...)                                 \
 335         printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 336 #define pr_alert_once(fmt, ...)                                 \
 337         printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 338 #define pr_crit_once(fmt, ...)                                  \
 339         printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 340 #define pr_err_once(fmt, ...)                                   \
 341         printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 342 #define pr_warn_once(fmt, ...)                                  \
 343         printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 344 #define pr_notice_once(fmt, ...)                                \
 345         printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 346 #define pr_info_once(fmt, ...)                                  \
 347         printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 348 #define pr_cont_once(fmt, ...)                                  \
 349         printk_once(KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
 350
 351 #if defined(DEBUG)
 352 #define pr_devel_once(fmt, ...)                                 \
 353         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 354 #else
 355 #define pr_devel_once(fmt, ...)                                 \
 356         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 357 #endif
 358
 359 /* If you are writing a driver, please use dev_dbg instead */
 360 #if defined(DEBUG)
 361 #define pr_debug_once(fmt, ...)                                 \
 362         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 363 #else
 364 #define pr_debug_once(fmt, ...)                                 \
 365         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 366 #endif
 367
 368 /*
 369  * ratelimited messages with local ratelimit_state,
 370  * no local ratelimit_state used in the !PRINTK case
 371  */
 372 #ifdef CONFIG_PRINTK
 373 #define printk_ratelimited(fmt, ...)                                    \
 374 ({                                                                      \
 375         static DEFINE_RATELIMIT_STATE(_rs,                              \
 376                                       DEFAULT_RATELIMIT_INTERVAL,       \
 377                                       DEFAULT_RATELIMIT_BURST);         \
 378                                                                         \
 379         if (__ratelimit(&_rs))                                          \
 380                 printk(fmt, ##__VA_ARGS__);                             \
 381 })
 382 #else
 383 #define printk_ratelimited(fmt, ...)                                    \
 384         no_printk(fmt, ##__VA_ARGS__)
 385 #endif
 386
 387 #define pr_emerg_ratelimited(fmt, ...)                                  \
 388         printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 389 #define pr_alert_ratelimited(fmt, ...)                                  \
 390         printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 391 #define pr_crit_ratelimited(fmt, ...)                                   \
 392         printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 393 #define pr_err_ratelimited(fmt, ...)                                    \
 394         printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 395 #define pr_warn_ratelimited(fmt, ...)                                   \
 396         printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 397 #define pr_notice_ratelimited(fmt, ...)                                 \
 398         printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 399 #define pr_info_ratelimited(fmt, ...)                                   \
 400         printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 401 /* no pr_cont_ratelimited, don't do that... */
 402
 403 #if defined(DEBUG)
 404 #define pr_devel_ratelimited(fmt, ...)                                  \
 405         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 406 #else
 407 #define pr_devel_ratelimited(fmt, ...)                                  \
 408         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 409 #endif
 410
 411 /* If you are writing a driver, please use dev_dbg instead */
 412 #if defined(CONFIG_DYNAMIC_DEBUG)
 413 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
 414 #define pr_debug_ratelimited(fmt, ...)                                  \
 415 do {                                                                    \
 416         static DEFINE_RATELIMIT_STATE(_rs,                              \
 417                                       DEFAULT_RATELIMIT_INTERVAL,       \
 418                                       DEFAULT_RATELIMIT_BURST);         \
 419         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt));         \
 420         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) &&        \
 421             __ratelimit(&_rs))                                          \
 422                 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__);    \
 423 } while (0)
 424 #elif defined(DEBUG)
 425 #define pr_debug_ratelimited(fmt, ...)                                  \
 426         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 427 #else
 428 #define pr_debug_ratelimited(fmt, ...) \
 429         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 430 #endif
 431
 432 extern const struct file_operations kmsg_fops;
 433
 434 enum {
 435         DUMP_PREFIX_NONE,
 436         DUMP_PREFIX_ADDRESS,
 437         DUMP_PREFIX_OFFSET
 438 };
 439 extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
 440                               int groupsize, char *linebuf, size_t linebuflen,
 441                               bool ascii);
 442 #ifdef CONFIG_PRINTK
 443 extern void print_hex_dump(const char *level, const char *prefix_str,
 444                            int prefix_type, int rowsize, int groupsize,
 445                            const void *buf, size_t len, bool ascii);
 446 #if defined(CONFIG_DYNAMIC_DEBUG)
 447 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
 448         dynamic_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true)
 449 #else
 450 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 451                                  const void *buf, size_t len);
 452 #endif /* defined(CONFIG_DYNAMIC_DEBUG) */
 453 #else
 454 static inline void print_hex_dump(const char *level, const char *prefix_str,
 455                                   int prefix_type, int rowsize, int groupsize,
 456                                   const void *buf, size_t len, bool ascii)
 457 {
 458 }
 459 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 460                                         const void *buf, size_t len)
 461 {
 462 }
 463
 464 #endif
 465
 466 #if defined(CONFIG_DYNAMIC_DEBUG)
 467 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,  \
 468                              groupsize, buf, len, ascii)        \
 469         dynamic_hex_dump(prefix_str, prefix_type, rowsize,      \
 470                          groupsize, buf, len, ascii)
 471 #elif defined(DEBUG)
 472 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,          \
 473                              groupsize, buf, len, ascii)                \
 474         print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize,    \
 475                        groupsize, buf, len, ascii)
 476 #else
 477 static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
 478                                         int rowsize, int groupsize,
 479                                         const void *buf, size_t len, bool ascii)
 480 {
 481 }
 482 #endif
 483
 484 #endif