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 #define PRINTK_MAX_SINGLE_HEADER_LEN 2
  14
  15 static inline int printk_get_level(const char *buffer)
  16 {
  17         if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
  18                 switch (buffer[1]) {
  19                 case '0' ... '7':
  20                 case 'd':       /* KERN_DEFAULT */
  21                 case 'c':       /* KERN_CONT */
  22                         return buffer[1];
  23                 }
  24         }
  25         return 0;
  26 }
  27
  28 static inline const char *printk_skip_level(const char *buffer)
  29 {
  30         if (printk_get_level(buffer))
  31                 return buffer + 2;
  32
  33         return buffer;
  34 }
  35
  36 static inline const char *printk_skip_headers(const char *buffer)
  37 {
  38         while (printk_get_level(buffer))
  39                 buffer = printk_skip_level(buffer);
  40
  41         return buffer;
  42 }
  43
  44 #define CONSOLE_EXT_LOG_MAX     8192
  45
  46 /* printk's without a loglevel use this.. */
  47 #define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT
  48
  49 /* We show everything that is MORE important than this.. */
  50 #define CONSOLE_LOGLEVEL_SILENT  0 /* Mum's the word */
  51 #define CONSOLE_LOGLEVEL_MIN     1 /* Minimum loglevel we let people use */
  52 #define CONSOLE_LOGLEVEL_QUIET   4 /* Shhh ..., when booted with "quiet" */
  53 #define CONSOLE_LOGLEVEL_DEBUG  10 /* issue debug messages */
  54 #define CONSOLE_LOGLEVEL_MOTORMOUTH 15  /* You can't shut this one up */
  55
  56 /*
  57  * Default used to be hard-coded at 7, we're now allowing it to be set from
  58  * kernel config.
  59  */
  60 #define CONSOLE_LOGLEVEL_DEFAULT CONFIG_CONSOLE_LOGLEVEL_DEFAULT
  61
  62 extern int console_printk[];
  63
  64 #define console_loglevel (console_printk[0])
  65 #define default_message_loglevel (console_printk[1])
  66 #define minimum_console_loglevel (console_printk[2])
  67 #define default_console_loglevel (console_printk[3])
  68
  69 static inline void console_silent(void)
  70 {
  71         console_loglevel = CONSOLE_LOGLEVEL_SILENT;
  72 }
  73
  74 static inline void console_verbose(void)
  75 {
  76         if (console_loglevel)
  77                 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
  78 }
  79
  80 /* strlen("ratelimit") + 1 */
  81 #define DEVKMSG_STR_MAX_SIZE 10
  82 extern char devkmsg_log_str[];
  83 struct ctl_table;
  84
  85 struct va_format {
  86         const char *fmt;
  87         va_list *va;
  88 };
  89
  90 /*
  91  * FW_BUG
  92  * Add this to a message where you are sure the firmware is buggy or behaves
  93  * really stupid or out of spec. Be aware that the responsible BIOS developer
  94  * should be able to fix this issue or at least get a concrete idea of the
  95  * problem by reading your message without the need of looking at the kernel
  96  * code.
  97  *
  98  * Use it for definite and high priority BIOS bugs.
  99  *
 100  * FW_WARN
 101  * Use it for not that clear (e.g. could the kernel messed up things already?)
 102  * and medium priority BIOS bugs.
 103  *
 104  * FW_INFO
 105  * Use this one if you want to tell the user or vendor about something
 106  * suspicious, but generally harmless related to the firmware.
 107  *
 108  * Use it for information or very low priority BIOS bugs.
 109  */
 110 #define FW_BUG          "[Firmware Bug]: "
 111 #define FW_WARN         "[Firmware Warn]: "
 112 #define FW_INFO         "[Firmware Info]: "
 113
 114 /*
 115  * HW_ERR
 116  * Add this to a message for hardware errors, so that user can report
 117  * it to hardware vendor instead of LKML or software vendor.
 118  */
 119 #define HW_ERR          "[Hardware Error]: "
 120
 121 /*
 122  * DEPRECATED
 123  * Add this to a message whenever you want to warn user space about the use
 124  * of a deprecated aspect of an API so they can stop using it
 125  */
 126 #define DEPRECATED      "[Deprecated]: "
 127
 128 /*
 129  * Dummy printk for disabled debugging statements to use whilst maintaining
 130  * gcc's format checking.
 131  */
 132 #define no_printk(fmt, ...)                             \
 133 ({                                                      \
 134         do {                                            \
 135                 if (0)                                  \
 136                         printk(fmt, ##__VA_ARGS__);     \
 137         } while (0);                                    \
 138         0;                                              \
 139 })
 140
 141 #ifdef CONFIG_EARLY_PRINTK
 142 extern asmlinkage __printf(1, 2)
 143 void early_printk(const char *fmt, ...);
 144 #else
 145 static inline __printf(1, 2) __cold
 146 void early_printk(const char *s, ...) { }
 147 #endif
 148
 149 #ifdef CONFIG_PRINTK_NMI
 150 extern void printk_nmi_init(void);
 151 extern void printk_nmi_enter(void);
 152 extern void printk_nmi_exit(void);
 153 extern void printk_nmi_flush(void);
 154 extern void printk_nmi_flush_on_panic(void);
 155 #else
 156 static inline void printk_nmi_init(void) { }
 157 static inline void printk_nmi_enter(void) { }
 158 static inline void printk_nmi_exit(void) { }
 159 static inline void printk_nmi_flush(void) { }
 160 static inline void printk_nmi_flush_on_panic(void) { }
 161 #endif /* PRINTK_NMI */
 162
 163 #ifdef CONFIG_PRINTK
 164 asmlinkage __printf(5, 0)
 165 int vprintk_emit(int facility, int level,
 166                  const char *dict, size_t dictlen,
 167                  const char *fmt, va_list args);
 168
 169 asmlinkage __printf(1, 0)
 170 int vprintk(const char *fmt, va_list args);
 171
 172 asmlinkage __printf(5, 6) __cold
 173 int printk_emit(int facility, int level,
 174                 const char *dict, size_t dictlen,
 175                 const char *fmt, ...);
 176
 177 asmlinkage __printf(1, 2) __cold
 178 int printk(const char *fmt, ...);
 179
 180 /*
 181  * Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !
 182  */
 183 __printf(1, 2) __cold int printk_deferred(const char *fmt, ...);
 184
 185 /*
 186  * Please don't use printk_ratelimit(), because it shares ratelimiting state
 187  * with all other unrelated printk_ratelimit() callsites.  Instead use
 188  * printk_ratelimited() or plain old __ratelimit().
 189  */
 190 extern int __printk_ratelimit(const char *func);
 191 #define printk_ratelimit() __printk_ratelimit(__func__)
 192 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 193                                    unsigned int interval_msec);
 194
 195 extern int printk_delay_msec;
 196 extern int dmesg_restrict;
 197 extern int kptr_restrict;
 198
 199 extern int
 200 devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, void __user *buf,
 201                           size_t *lenp, loff_t *ppos);
 202
 203 extern void wake_up_klogd(void);
 204
 205 char *log_buf_addr_get(void);
 206 u32 log_buf_len_get(void);
 207 void log_buf_kexec_setup(void);
 208 void __init setup_log_buf(int early);
 209 __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
 210 void dump_stack_print_info(const char *log_lvl);
 211 void show_regs_print_info(const char *log_lvl);
 212 #else
 213 static inline __printf(1, 0)
 214 int vprintk(const char *s, va_list args)
 215 {
 216         return 0;
 217 }
 218 static inline __printf(1, 2) __cold
 219 int printk(const char *s, ...)
 220 {
 221         return 0;
 222 }
 223 static inline __printf(1, 2) __cold
 224 int printk_deferred(const char *s, ...)
 225 {
 226         return 0;
 227 }
 228 static inline int printk_ratelimit(void)
 229 {
 230         return 0;
 231 }
 232 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 233                                           unsigned int interval_msec)
 234 {
 235         return false;
 236 }
 237
 238 static inline void wake_up_klogd(void)
 239 {
 240 }
 241
 242 static inline char *log_buf_addr_get(void)
 243 {
 244         return NULL;
 245 }
 246
 247 static inline u32 log_buf_len_get(void)
 248 {
 249         return 0;
 250 }
 251
 252 static inline void log_buf_kexec_setup(void)
 253 {
 254 }
 255
 256 static inline void setup_log_buf(int early)
 257 {
 258 }
 259
 260 static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
 261 {
 262 }
 263
 264 static inline void dump_stack_print_info(const char *log_lvl)
 265 {
 266 }
 267
 268 static inline void show_regs_print_info(const char *log_lvl)
 269 {
 270 }
 271 #endif
 272
 273 extern asmlinkage void dump_stack(void) __cold;
 274
 275 #ifndef pr_fmt
 276 #define pr_fmt(fmt) fmt
 277 #endif
 278
 279 /*
 280  * These can be used to print at the various log levels.
 281  * All of these will print unconditionally, although note that pr_debug()
 282  * and other debug macros are compiled out unless either DEBUG is defined
 283  * or CONFIG_DYNAMIC_DEBUG is set.
 284  */
 285 #define pr_emerg(fmt, ...) \
 286         printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 287 #define pr_alert(fmt, ...) \
 288         printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 289 #define pr_crit(fmt, ...) \
 290         printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 291 #define pr_err(fmt, ...) \
 292         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 293 #define pr_warning(fmt, ...) \
 294         printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 295 #define pr_warn pr_warning
 296 #define pr_notice(fmt, ...) \
 297         printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 298 #define pr_info(fmt, ...) \
 299         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 300 /*
 301  * Like KERN_CONT, pr_cont() should only be used when continuing
 302  * a line with no newline ('\n') enclosed. Otherwise it defaults
 303  * back to KERN_DEFAULT.
 304  */
 305 #define pr_cont(fmt, ...) \
 306         printk(KERN_CONT fmt, ##__VA_ARGS__)
 307
 308 /* pr_devel() should produce zero code unless DEBUG is defined */
 309 #ifdef DEBUG
 310 #define pr_devel(fmt, ...) \
 311         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 312 #else
 313 #define pr_devel(fmt, ...) \
 314         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 315 #endif
 316
 317
 318 /* If you are writing a driver, please use dev_dbg instead */
 319 #if defined(CONFIG_DYNAMIC_DEBUG)
 320 #include <linux/dynamic_debug.h>
 321
 322 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
 323 #define pr_debug(fmt, ...) \
 324         dynamic_pr_debug(fmt, ##__VA_ARGS__)
 325 #elif defined(DEBUG)
 326 #define pr_debug(fmt, ...) \
 327         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 328 #else
 329 #define pr_debug(fmt, ...) \
 330         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 331 #endif
 332
 333 /*
 334  * Print a one-time message (analogous to WARN_ONCE() et al):
 335  */
 336
 337 #ifdef CONFIG_PRINTK
 338 #define printk_once(fmt, ...)                                   \
 339 ({                                                              \
 340         static bool __print_once __read_mostly;                 \
 341         bool __ret_print_once = !__print_once;                  \
 342                                                                 \
 343         if (!__print_once) {                                    \
 344                 __print_once = true;                            \
 345                 printk(fmt, ##__VA_ARGS__);                     \
 346         }                                                       \
 347         unlikely(__ret_print_once);                             \
 348 })
 349 #define printk_deferred_once(fmt, ...)                          \
 350 ({                                                              \
 351         static bool __print_once __read_mostly;                 \
 352         bool __ret_print_once = !__print_once;                  \
 353                                                                 \
 354         if (!__print_once) {                                    \
 355                 __print_once = true;                            \
 356                 printk_deferred(fmt, ##__VA_ARGS__);            \
 357         }                                                       \
 358         unlikely(__ret_print_once);                             \
 359 })
 360 #else
 361 #define printk_once(fmt, ...)                                   \
 362         no_printk(fmt, ##__VA_ARGS__)
 363 #define printk_deferred_once(fmt, ...)                          \
 364         no_printk(fmt, ##__VA_ARGS__)
 365 #endif
 366
 367 #define pr_emerg_once(fmt, ...)                                 \
 368         printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 369 #define pr_alert_once(fmt, ...)                                 \
 370         printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 371 #define pr_crit_once(fmt, ...)                                  \
 372         printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 373 #define pr_err_once(fmt, ...)                                   \
 374         printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 375 #define pr_warn_once(fmt, ...)                                  \
 376         printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 377 #define pr_notice_once(fmt, ...)                                \
 378         printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 379 #define pr_info_once(fmt, ...)                                  \
 380         printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 381 #define pr_cont_once(fmt, ...)                                  \
 382         printk_once(KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
 383
 384 #if defined(DEBUG)
 385 #define pr_devel_once(fmt, ...)                                 \
 386         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 387 #else
 388 #define pr_devel_once(fmt, ...)                                 \
 389         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 390 #endif
 391
 392 /* If you are writing a driver, please use dev_dbg instead */
 393 #if defined(DEBUG)
 394 #define pr_debug_once(fmt, ...)                                 \
 395         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 396 #else
 397 #define pr_debug_once(fmt, ...)                                 \
 398         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 399 #endif
 400
 401 /*
 402  * ratelimited messages with local ratelimit_state,
 403  * no local ratelimit_state used in the !PRINTK case
 404  */
 405 #ifdef CONFIG_PRINTK
 406 #define printk_ratelimited(fmt, ...)                                    \
 407 ({                                                                      \
 408         static DEFINE_RATELIMIT_STATE(_rs,                              \
 409                                       DEFAULT_RATELIMIT_INTERVAL,       \
 410                                       DEFAULT_RATELIMIT_BURST);         \
 411                                                                         \
 412         if (__ratelimit(&_rs))                                          \
 413                 printk(fmt, ##__VA_ARGS__);                             \
 414 })
 415 #else
 416 #define printk_ratelimited(fmt, ...)                                    \
 417         no_printk(fmt, ##__VA_ARGS__)
 418 #endif
 419
 420 #define pr_emerg_ratelimited(fmt, ...)                                  \
 421         printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 422 #define pr_alert_ratelimited(fmt, ...)                                  \
 423         printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 424 #define pr_crit_ratelimited(fmt, ...)                                   \
 425         printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 426 #define pr_err_ratelimited(fmt, ...)                                    \
 427         printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 428 #define pr_warn_ratelimited(fmt, ...)                                   \
 429         printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 430 #define pr_notice_ratelimited(fmt, ...)                                 \
 431         printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 432 #define pr_info_ratelimited(fmt, ...)                                   \
 433         printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 434 /* no pr_cont_ratelimited, don't do that... */
 435
 436 #if defined(DEBUG)
 437 #define pr_devel_ratelimited(fmt, ...)                                  \
 438         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 439 #else
 440 #define pr_devel_ratelimited(fmt, ...)                                  \
 441         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 442 #endif
 443
 444 /* If you are writing a driver, please use dev_dbg instead */
 445 #if defined(CONFIG_DYNAMIC_DEBUG)
 446 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
 447 #define pr_debug_ratelimited(fmt, ...)                                  \
 448 do {                                                                    \
 449         static DEFINE_RATELIMIT_STATE(_rs,                              \
 450                                       DEFAULT_RATELIMIT_INTERVAL,       \
 451                                       DEFAULT_RATELIMIT_BURST);         \
 452         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt));         \
 453         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) &&        \
 454             __ratelimit(&_rs))                                          \
 455                 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__);    \
 456 } while (0)
 457 #elif defined(DEBUG)
 458 #define pr_debug_ratelimited(fmt, ...)                                  \
 459         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 460 #else
 461 #define pr_debug_ratelimited(fmt, ...) \
 462         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 463 #endif
 464
 465 extern const struct file_operations kmsg_fops;
 466
 467 enum {
 468         DUMP_PREFIX_NONE,
 469         DUMP_PREFIX_ADDRESS,
 470         DUMP_PREFIX_OFFSET
 471 };
 472 extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
 473                               int groupsize, char *linebuf, size_t linebuflen,
 474                               bool ascii);
 475 #ifdef CONFIG_PRINTK
 476 extern void print_hex_dump(const char *level, const char *prefix_str,
 477                            int prefix_type, int rowsize, int groupsize,
 478                            const void *buf, size_t len, bool ascii);
 479 #if defined(CONFIG_DYNAMIC_DEBUG)
 480 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
 481         dynamic_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true)
 482 #else
 483 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 484                                  const void *buf, size_t len);
 485 #endif /* defined(CONFIG_DYNAMIC_DEBUG) */
 486 #else
 487 static inline void print_hex_dump(const char *level, const char *prefix_str,
 488                                   int prefix_type, int rowsize, int groupsize,
 489                                   const void *buf, size_t len, bool ascii)
 490 {
 491 }
 492 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 493                                         const void *buf, size_t len)
 494 {
 495 }
 496
 497 #endif
 498
 499 #if defined(CONFIG_DYNAMIC_DEBUG)
 500 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,  \
 501                              groupsize, buf, len, ascii)        \
 502         dynamic_hex_dump(prefix_str, prefix_type, rowsize,      \
 503                          groupsize, buf, len, ascii)
 504 #elif defined(DEBUG)
 505 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,          \
 506                              groupsize, buf, len, ascii)                \
 507         print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize,    \
 508                        groupsize, buf, len, ascii)
 509 #else
 510 static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
 511                                         int rowsize, int groupsize,
 512                                         const void *buf, size_t len, bool ascii)
 513 {
 514 }
 515 #endif
 516
 517 #endif