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