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