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 /* strlen("ratelimit") + 1 */
  65 #define DEVKMSG_STR_MAX_SIZE 10
  66 extern char devkmsg_log_str[];
  67 struct ctl_table;
  68
  69 struct va_format {
  70         const char *fmt;
  71         va_list *va;
  72 };
  73
  74 /*
  75  * FW_BUG
  76  * Add this to a message where you are sure the firmware is buggy or behaves
  77  * really stupid or out of spec. Be aware that the responsible BIOS developer
  78  * should be able to fix this issue or at least get a concrete idea of the
  79  * problem by reading your message without the need of looking at the kernel
  80  * code.
  81  *
  82  * Use it for definite and high priority BIOS bugs.
  83  *
  84  * FW_WARN
  85  * Use it for not that clear (e.g. could the kernel messed up things already?)
  86  * and medium priority BIOS bugs.
  87  *
  88  * FW_INFO
  89  * Use this one if you want to tell the user or vendor about something
  90  * suspicious, but generally harmless related to the firmware.
  91  *
  92  * Use it for information or very low priority BIOS bugs.
  93  */
  94 #define FW_BUG          "[Firmware Bug]: "
  95 #define FW_WARN         "[Firmware Warn]: "
  96 #define FW_INFO         "[Firmware Info]: "
  97
  98 /*
  99  * HW_ERR
 100  * Add this to a message for hardware errors, so that user can report
 101  * it to hardware vendor instead of LKML or software vendor.
 102  */
 103 #define HW_ERR          "[Hardware Error]: "
 104
 105 /*
 106  * DEPRECATED
 107  * Add this to a message whenever you want to warn user space about the use
 108  * of a deprecated aspect of an API so they can stop using it
 109  */
 110 #define DEPRECATED      "[Deprecated]: "
 111
 112 /*
 113  * Dummy printk for disabled debugging statements to use whilst maintaining
 114  * gcc's format checking.
 115  */
 116 #define no_printk(fmt, ...)                             \
 117 ({                                                      \
 118         do {                                            \
 119                 if (0)                                  \
 120                         printk(fmt, ##__VA_ARGS__);     \
 121         } while (0);                                    \
 122         0;                                              \
 123 })
 124
 125 #ifdef CONFIG_EARLY_PRINTK
 126 extern asmlinkage __printf(1, 2)
 127 void early_printk(const char *fmt, ...);
 128 #else
 129 static inline __printf(1, 2) __cold
 130 void early_printk(const char *s, ...) { }
 131 #endif
 132
 133 #ifdef CONFIG_PRINTK_NMI
 134 extern void printk_nmi_init(void);
 135 extern void printk_nmi_enter(void);
 136 extern void printk_nmi_exit(void);
 137 extern void printk_nmi_flush(void);
 138 extern void printk_nmi_flush_on_panic(void);
 139 #else
 140 static inline void printk_nmi_init(void) { }
 141 static inline void printk_nmi_enter(void) { }
 142 static inline void printk_nmi_exit(void) { }
 143 static inline void printk_nmi_flush(void) { }
 144 static inline void printk_nmi_flush_on_panic(void) { }
 145 #endif /* PRINTK_NMI */
 146
 147 #ifdef CONFIG_PRINTK
 148 asmlinkage __printf(5, 0)
 149 int vprintk_emit(int facility, int level,
 150                  const char *dict, size_t dictlen,
 151                  const char *fmt, va_list args);
 152
 153 asmlinkage __printf(1, 0)
 154 int vprintk(const char *fmt, va_list args);
 155
 156 asmlinkage __printf(5, 6) __cold
 157 int printk_emit(int facility, int level,
 158                 const char *dict, size_t dictlen,
 159                 const char *fmt, ...);
 160
 161 asmlinkage __printf(1, 2) __cold
 162 int printk(const char *fmt, ...);
 163
 164 /*
 165  * Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !
 166  */
 167 __printf(1, 2) __cold int printk_deferred(const char *fmt, ...);
 168
 169 /*
 170  * Please don't use printk_ratelimit(), because it shares ratelimiting state
 171  * with all other unrelated printk_ratelimit() callsites.  Instead use
 172  * printk_ratelimited() or plain old __ratelimit().
 173  */
 174 extern int __printk_ratelimit(const char *func);
 175 #define printk_ratelimit() __printk_ratelimit(__func__)
 176 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 177                                    unsigned int interval_msec);
 178
 179 extern int printk_delay_msec;
 180 extern int dmesg_restrict;
 181 extern int kptr_restrict;
 182
 183 extern int
 184 devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, void __user *buf,
 185                           size_t *lenp, loff_t *ppos);
 186
 187 extern void wake_up_klogd(void);
 188
 189 char *log_buf_addr_get(void);
 190 u32 log_buf_len_get(void);
 191 void log_buf_kexec_setup(void);
 192 void __init setup_log_buf(int early);
 193 __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
 194 void dump_stack_print_info(const char *log_lvl);
 195 void show_regs_print_info(const char *log_lvl);
 196 #else
 197 static inline __printf(1, 0)
 198 int vprintk(const char *s, va_list args)
 199 {
 200         return 0;
 201 }
 202 static inline __printf(1, 2) __cold
 203 int printk(const char *s, ...)
 204 {
 205         return 0;
 206 }
 207 static inline __printf(1, 2) __cold
 208 int printk_deferred(const char *s, ...)
 209 {
 210         return 0;
 211 }
 212 static inline int printk_ratelimit(void)
 213 {
 214         return 0;
 215 }
 216 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 217                                           unsigned int interval_msec)
 218 {
 219         return false;
 220 }
 221
 222 static inline void wake_up_klogd(void)
 223 {
 224 }
 225
 226 static inline char *log_buf_addr_get(void)
 227 {
 228         return NULL;
 229 }
 230
 231 static inline u32 log_buf_len_get(void)
 232 {
 233         return 0;
 234 }
 235
 236 static inline void log_buf_kexec_setup(void)
 237 {
 238 }
 239
 240 static inline void setup_log_buf(int early)
 241 {
 242 }
 243
 244 static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
 245 {
 246 }
 247
 248 static inline void dump_stack_print_info(const char *log_lvl)
 249 {
 250 }
 251
 252 static inline void show_regs_print_info(const char *log_lvl)
 253 {
 254 }
 255 #endif
 256
 257 extern asmlinkage void dump_stack(void) __cold;
 258
 259 #ifndef pr_fmt
 260 #define pr_fmt(fmt) fmt
 261 #endif
 262
 263 /*
 264  * These can be used to print at the various log levels.
 265  * All of these will print unconditionally, although note that pr_debug()
 266  * and other debug macros are compiled out unless either DEBUG is defined
 267  * or CONFIG_DYNAMIC_DEBUG is set.
 268  */
 269
 270 #ifdef CONFIG_PRINTK
 271
 272 asmlinkage __printf(1, 2) __cold void __pr_emerg(const char *fmt, ...);
 273 asmlinkage __printf(1, 2) __cold void __pr_alert(const char *fmt, ...);
 274 asmlinkage __printf(1, 2) __cold void __pr_crit(const char *fmt, ...);
 275 asmlinkage __printf(1, 2) __cold void __pr_err(const char *fmt, ...);
 276 asmlinkage __printf(1, 2) __cold void __pr_warn(const char *fmt, ...);
 277 asmlinkage __printf(1, 2) __cold void __pr_notice(const char *fmt, ...);
 278 asmlinkage __printf(1, 2) __cold void __pr_info(const char *fmt, ...);
 279
 280 #define pr_emerg(fmt, ...)      __pr_emerg(pr_fmt(fmt), ##__VA_ARGS__)
 281 #define pr_alert(fmt, ...)      __pr_alert(pr_fmt(fmt), ##__VA_ARGS__)
 282 #define pr_crit(fmt, ...)       __pr_crit(pr_fmt(fmt), ##__VA_ARGS__)
 283 #define pr_err(fmt, ...)        __pr_err(pr_fmt(fmt), ##__VA_ARGS__)
 284 #define pr_warn(fmt, ...)       __pr_warn(pr_fmt(fmt), ##__VA_ARGS__)
 285 #define pr_notice(fmt, ...)     __pr_notice(pr_fmt(fmt), ##__VA_ARGS__)
 286 #define pr_info(fmt, ...)       __pr_info(pr_fmt(fmt), ##__VA_ARGS__)
 287
 288 #else
 289
 290 #define pr_emerg(fmt, ...)      printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 291 #define pr_alert(fmt, ...)      printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 292 #define pr_crit(fmt, ...)       printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 293 #define pr_err(fmt, ...)        printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 294 #define pr_warn(fmt, ...)       printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 295 #define pr_notice(fmt, ...)     printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 296 #define pr_info(fmt, ...)       printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 297
 298 #endif
 299
 300 #define pr_warning pr_warn
 301
 302 /*
 303  * Like KERN_CONT, pr_cont() should only be used when continuing
 304  * a line with no newline ('\n') enclosed. Otherwise it defaults
 305  * back to KERN_DEFAULT.
 306  */
 307 #define pr_cont(fmt, ...) \
 308         printk(KERN_CONT fmt, ##__VA_ARGS__)
 309
 310 /* pr_devel() should produce zero code unless DEBUG is defined */
 311 #ifdef DEBUG
 312 #define pr_devel(fmt, ...) \
 313         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 314 #else
 315 #define pr_devel(fmt, ...) \
 316         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 317 #endif
 318
 319
 320 /* If you are writing a driver, please use dev_dbg instead */
 321 #if defined(CONFIG_DYNAMIC_DEBUG)
 322 #include <linux/dynamic_debug.h>
 323
 324 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
 325 #define pr_debug(fmt, ...) \
 326         dynamic_pr_debug(fmt, ##__VA_ARGS__)
 327 #elif defined(DEBUG)
 328 #define pr_debug(fmt, ...) \
 329         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 330 #else
 331 #define pr_debug(fmt, ...) \
 332         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 333 #endif
 334
 335 /*
 336  * Print a one-time message (analogous to WARN_ONCE() et al):
 337  */
 338
 339 #ifdef CONFIG_PRINTK
 340 #define printk_once(fmt, ...)                                   \
 341 ({                                                              \
 342         static bool __print_once __read_mostly;                 \
 343         bool __ret_print_once = !__print_once;                  \
 344                                                                 \
 345         if (!__print_once) {                                    \
 346                 __print_once = true;                            \
 347                 printk(fmt, ##__VA_ARGS__);                     \
 348         }                                                       \
 349         unlikely(__ret_print_once);                             \
 350 })
 351 #define printk_deferred_once(fmt, ...)                          \
 352 ({                                                              \
 353         static bool __print_once __read_mostly;                 \
 354         bool __ret_print_once = !__print_once;                  \
 355                                                                 \
 356         if (!__print_once) {                                    \
 357                 __print_once = true;                            \
 358                 printk_deferred(fmt, ##__VA_ARGS__);            \
 359         }                                                       \
 360         unlikely(__ret_print_once);                             \
 361 })
 362 #else
 363 #define printk_once(fmt, ...)                                   \
 364         no_printk(fmt, ##__VA_ARGS__)
 365 #define printk_deferred_once(fmt, ...)                          \
 366         no_printk(fmt, ##__VA_ARGS__)
 367 #endif
 368
 369 #define pr_emerg_once(fmt, ...)                                 \
 370         printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 371 #define pr_alert_once(fmt, ...)                                 \
 372         printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 373 #define pr_crit_once(fmt, ...)                                  \
 374         printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 375 #define pr_err_once(fmt, ...)                                   \
 376         printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 377 #define pr_warn_once(fmt, ...)                                  \
 378         printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 379 #define pr_notice_once(fmt, ...)                                \
 380         printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 381 #define pr_info_once(fmt, ...)                                  \
 382         printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 383 #define pr_cont_once(fmt, ...)                                  \
 384         printk_once(KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
 385
 386 #if defined(DEBUG)
 387 #define pr_devel_once(fmt, ...)                                 \
 388         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 389 #else
 390 #define pr_devel_once(fmt, ...)                                 \
 391         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 392 #endif
 393
 394 /* If you are writing a driver, please use dev_dbg instead */
 395 #if defined(DEBUG)
 396 #define pr_debug_once(fmt, ...)                                 \
 397         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 398 #else
 399 #define pr_debug_once(fmt, ...)                                 \
 400         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 401 #endif
 402
 403 /*
 404  * ratelimited messages with local ratelimit_state,
 405  * no local ratelimit_state used in the !PRINTK case
 406  */
 407 #ifdef CONFIG_PRINTK
 408 #define printk_ratelimited(fmt, ...)                                    \
 409 ({                                                                      \
 410         static DEFINE_RATELIMIT_STATE(_rs,                              \
 411                                       DEFAULT_RATELIMIT_INTERVAL,       \
 412                                       DEFAULT_RATELIMIT_BURST);         \
 413                                                                         \
 414         if (__ratelimit(&_rs))                                          \
 415                 printk(fmt, ##__VA_ARGS__);                             \
 416 })
 417 #else
 418 #define printk_ratelimited(fmt, ...)                                    \
 419         no_printk(fmt, ##__VA_ARGS__)
 420 #endif
 421
 422 #define pr_emerg_ratelimited(fmt, ...)                                  \
 423         printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 424 #define pr_alert_ratelimited(fmt, ...)                                  \
 425         printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 426 #define pr_crit_ratelimited(fmt, ...)                                   \
 427         printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 428 #define pr_err_ratelimited(fmt, ...)                                    \
 429         printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 430 #define pr_warn_ratelimited(fmt, ...)                                   \
 431         printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 432 #define pr_notice_ratelimited(fmt, ...)                                 \
 433         printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 434 #define pr_info_ratelimited(fmt, ...)                                   \
 435         printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 436 /* no pr_cont_ratelimited, don't do that... */
 437
 438 #if defined(DEBUG)
 439 #define pr_devel_ratelimited(fmt, ...)                                  \
 440         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 441 #else
 442 #define pr_devel_ratelimited(fmt, ...)                                  \
 443         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 444 #endif
 445
 446 /* If you are writing a driver, please use dev_dbg instead */
 447 #if defined(CONFIG_DYNAMIC_DEBUG)
 448 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
 449 #define pr_debug_ratelimited(fmt, ...)                                  \
 450 do {                                                                    \
 451         static DEFINE_RATELIMIT_STATE(_rs,                              \
 452                                       DEFAULT_RATELIMIT_INTERVAL,       \
 453                                       DEFAULT_RATELIMIT_BURST);         \
 454         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt));         \
 455         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) &&        \
 456             __ratelimit(&_rs))                                          \
 457                 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__);    \
 458 } while (0)
 459 #elif defined(DEBUG)
 460 #define pr_debug_ratelimited(fmt, ...)                                  \
 461         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 462 #else
 463 #define pr_debug_ratelimited(fmt, ...) \
 464         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 465 #endif
 466
 467 extern const struct file_operations kmsg_fops;
 468
 469 enum {
 470         DUMP_PREFIX_NONE,
 471         DUMP_PREFIX_ADDRESS,
 472         DUMP_PREFIX_OFFSET
 473 };
 474 extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
 475                               int groupsize, char *linebuf, size_t linebuflen,
 476                               bool ascii);
 477 #ifdef CONFIG_PRINTK
 478 extern void print_hex_dump(const char *level, const char *prefix_str,
 479                            int prefix_type, int rowsize, int groupsize,
 480                            const void *buf, size_t len, bool ascii);
 481 #if defined(CONFIG_DYNAMIC_DEBUG)
 482 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
 483         dynamic_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true)
 484 #else
 485 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 486                                  const void *buf, size_t len);
 487 #endif /* defined(CONFIG_DYNAMIC_DEBUG) */
 488 #else
 489 static inline void print_hex_dump(const char *level, const char *prefix_str,
 490                                   int prefix_type, int rowsize, int groupsize,
 491                                   const void *buf, size_t len, bool ascii)
 492 {
 493 }
 494 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 495                                         const void *buf, size_t len)
 496 {
 497 }
 498
 499 #endif
 500
 501 #if defined(CONFIG_DYNAMIC_DEBUG)
 502 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,  \
 503                              groupsize, buf, len, ascii)        \
 504         dynamic_hex_dump(prefix_str, prefix_type, rowsize,      \
 505                          groupsize, buf, len, ascii)
 506 #elif defined(DEBUG)
 507 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,          \
 508                              groupsize, buf, len, ascii)                \
 509         print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize,    \
 510                        groupsize, buf, len, ascii)
 511 #else
 512 static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
 513                                         int rowsize, int groupsize,
 514                                         const void *buf, size_t len, bool ascii)
 515 {
 516 }
 517 #endif
 518
 519 #endif