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
   8 extern const char linux_banner[];
   9 extern const char linux_proc_banner[];
  10
  11 static inline int printk_get_level(const char *buffer)
  12 {
  13         if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
  14                 switch (buffer[1]) {
  15                 case '0' ... '7':
  16                 case 'd':       /* KERN_DEFAULT */
  17                         return buffer[1];
  18                 }
  19         }
  20         return 0;
  21 }
  22
  23 static inline const char *printk_skip_level(const char *buffer)
  24 {
  25         if (printk_get_level(buffer)) {
  26                 switch (buffer[1]) {
  27                 case '0' ... '7':
  28                 case 'd':       /* KERN_DEFAULT */
  29                         return buffer + 2;
  30                 }
  31         }
  32         return buffer;
  33 }
  34
  35 extern int console_printk[];
  36
  37 #define console_loglevel (console_printk[0])
  38 #define default_message_loglevel (console_printk[1])
  39 #define minimum_console_loglevel (console_printk[2])
  40 #define default_console_loglevel (console_printk[3])
  41
  42 static inline void console_silent(void)
  43 {
  44         console_loglevel = 0;
  45 }
  46
  47 static inline void console_verbose(void)
  48 {
  49         if (console_loglevel)
  50                 console_loglevel = 15;
  51 }
  52
  53 struct va_format {
  54         const char *fmt;
  55         va_list *va;
  56 };
  57
  58 /*
  59  * FW_BUG
  60  * Add this to a message where you are sure the firmware is buggy or behaves
  61  * really stupid or out of spec. Be aware that the responsible BIOS developer
  62  * should be able to fix this issue or at least get a concrete idea of the
  63  * problem by reading your message without the need of looking at the kernel
  64  * code.
  65  *
  66  * Use it for definite and high priority BIOS bugs.
  67  *
  68  * FW_WARN
  69  * Use it for not that clear (e.g. could the kernel messed up things already?)
  70  * and medium priority BIOS bugs.
  71  *
  72  * FW_INFO
  73  * Use this one if you want to tell the user or vendor about something
  74  * suspicious, but generally harmless related to the firmware.
  75  *
  76  * Use it for information or very low priority BIOS bugs.
  77  */
  78 #define FW_BUG          "[Firmware Bug]: "
  79 #define FW_WARN         "[Firmware Warn]: "
  80 #define FW_INFO         "[Firmware Info]: "
  81
  82 /*
  83  * HW_ERR
  84  * Add this to a message for hardware errors, so that user can report
  85  * it to hardware vendor instead of LKML or software vendor.
  86  */
  87 #define HW_ERR          "[Hardware Error]: "
  88
  89 /*
  90  * Dummy printk for disabled debugging statements to use whilst maintaining
  91  * gcc's format and side-effect checking.
  92  */
  93 static inline __printf(1, 2)
  94 int no_printk(const char *fmt, ...)
  95 {
  96         return 0;
  97 }
  98
  99 #ifdef CONFIG_EARLY_PRINTK
 100 extern asmlinkage __printf(1, 2)
 101 void early_printk(const char *fmt, ...);
 102 void early_vprintk(const char *fmt, va_list ap);
 103 #else
 104 static inline __printf(1, 2) __cold
 105 void early_printk(const char *s, ...) { }
 106 #endif
 107
 108 #ifdef CONFIG_PRINTK
 109 asmlinkage __printf(5, 0)
 110 int vprintk_emit(int facility, int level,
 111                  const char *dict, size_t dictlen,
 112                  const char *fmt, va_list args);
 113
 114 asmlinkage __printf(1, 0)
 115 int vprintk(const char *fmt, va_list args);
 116
 117 asmlinkage __printf(5, 6) __cold
 118 asmlinkage int printk_emit(int facility, int level,
 119                            const char *dict, size_t dictlen,
 120                            const char *fmt, ...);
 121
 122 asmlinkage __printf(1, 2) __cold
 123 int printk(const char *fmt, ...);
 124
 125 /*
 126  * Special printk facility for scheduler use only, _DO_NOT_USE_ !
 127  */
 128 __printf(1, 2) __cold int printk_sched(const char *fmt, ...);
 129
 130 /*
 131  * Please don't use printk_ratelimit(), because it shares ratelimiting state
 132  * with all other unrelated printk_ratelimit() callsites.  Instead use
 133  * printk_ratelimited() or plain old __ratelimit().
 134  */
 135 extern int __printk_ratelimit(const char *func);
 136 #define printk_ratelimit() __printk_ratelimit(__func__)
 137 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 138                                    unsigned int interval_msec);
 139
 140 extern int printk_delay_msec;
 141 extern int dmesg_restrict;
 142 extern int kptr_restrict;
 143
 144 extern void wake_up_klogd(void);
 145
 146 void log_buf_kexec_setup(void);
 147 void __init setup_log_buf(int early);
 148 void dump_stack_print_info(const char *log_lvl);
 149 #else
 150 static inline __printf(1, 0)
 151 int vprintk(const char *s, va_list args)
 152 {
 153         return 0;
 154 }
 155 static inline __printf(1, 2) __cold
 156 int printk(const char *s, ...)
 157 {
 158         return 0;
 159 }
 160 static inline __printf(1, 2) __cold
 161 int printk_sched(const char *s, ...)
 162 {
 163         return 0;
 164 }
 165 static inline int printk_ratelimit(void)
 166 {
 167         return 0;
 168 }
 169 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 170                                           unsigned int interval_msec)
 171 {
 172         return false;
 173 }
 174
 175 static inline void wake_up_klogd(void)
 176 {
 177 }
 178
 179 static inline void log_buf_kexec_setup(void)
 180 {
 181 }
 182
 183 static inline void setup_log_buf(int early)
 184 {
 185 }
 186
 187 static inline void dump_stack_print_info(const char *log_lvl)
 188 {
 189 }
 190 #endif
 191
 192 extern void dump_stack(void) __cold;
 193
 194 #ifndef pr_fmt
 195 #define pr_fmt(fmt) fmt
 196 #endif
 197
 198 #define pr_emerg(fmt, ...) \
 199         printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 200 #define pr_alert(fmt, ...) \
 201         printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 202 #define pr_crit(fmt, ...) \
 203         printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 204 #define pr_err(fmt, ...) \
 205         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 206 #define pr_warning(fmt, ...) \
 207         printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 208 #define pr_warn pr_warning
 209 #define pr_notice(fmt, ...) \
 210         printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 211 #define pr_info(fmt, ...) \
 212         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 213 #define pr_cont(fmt, ...) \
 214         printk(KERN_CONT fmt, ##__VA_ARGS__)
 215
 216 /* pr_devel() should produce zero code unless DEBUG is defined */
 217 #ifdef DEBUG
 218 #define pr_devel(fmt, ...) \
 219         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 220 #else
 221 #define pr_devel(fmt, ...) \
 222         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 223 #endif
 224
 225 /* If you are writing a driver, please use dev_dbg instead */
 226 #if defined(CONFIG_DYNAMIC_DEBUG)
 227 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
 228 #define pr_debug(fmt, ...) \
 229         dynamic_pr_debug(fmt, ##__VA_ARGS__)
 230 #elif defined(DEBUG)
 231 #define pr_debug(fmt, ...) \
 232         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 233 #else
 234 #define pr_debug(fmt, ...) \
 235         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 236 #endif
 237
 238 /*
 239  * Print a one-time message (analogous to WARN_ONCE() et al):
 240  */
 241
 242 #ifdef CONFIG_PRINTK
 243 #define printk_once(fmt, ...)                   \
 244 ({                                              \
 245         static bool __print_once;               \
 246                                                 \
 247         if (!__print_once) {                    \
 248                 __print_once = true;            \
 249                 printk(fmt, ##__VA_ARGS__);     \
 250         }                                       \
 251 })
 252 #else
 253 #define printk_once(fmt, ...)                   \
 254         no_printk(fmt, ##__VA_ARGS__)
 255 #endif
 256
 257 #define pr_emerg_once(fmt, ...)                                 \
 258         printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 259 #define pr_alert_once(fmt, ...)                                 \
 260         printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 261 #define pr_crit_once(fmt, ...)                                  \
 262         printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 263 #define pr_err_once(fmt, ...)                                   \
 264         printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 265 #define pr_warn_once(fmt, ...)                                  \
 266         printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 267 #define pr_notice_once(fmt, ...)                                \
 268         printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 269 #define pr_info_once(fmt, ...)                                  \
 270         printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 271 #define pr_cont_once(fmt, ...)                                  \
 272         printk_once(KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
 273
 274 #if defined(DEBUG)
 275 #define pr_devel_once(fmt, ...)                                 \
 276         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 277 #else
 278 #define pr_devel_once(fmt, ...)                                 \
 279         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 280 #endif
 281
 282 /* If you are writing a driver, please use dev_dbg instead */
 283 #if defined(DEBUG)
 284 #define pr_debug_once(fmt, ...)                                 \
 285         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 286 #else
 287 #define pr_debug_once(fmt, ...)                                 \
 288         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 289 #endif
 290
 291 /*
 292  * ratelimited messages with local ratelimit_state,
 293  * no local ratelimit_state used in the !PRINTK case
 294  */
 295 #ifdef CONFIG_PRINTK
 296 #define printk_ratelimited(fmt, ...)                                    \
 297 ({                                                                      \
 298         static DEFINE_RATELIMIT_STATE(_rs,                              \
 299                                       DEFAULT_RATELIMIT_INTERVAL,       \
 300                                       DEFAULT_RATELIMIT_BURST);         \
 301                                                                         \
 302         if (__ratelimit(&_rs))                                          \
 303                 printk(fmt, ##__VA_ARGS__);                             \
 304 })
 305 #else
 306 #define printk_ratelimited(fmt, ...)                                    \
 307         no_printk(fmt, ##__VA_ARGS__)
 308 #endif
 309
 310 #define pr_emerg_ratelimited(fmt, ...)                                  \
 311         printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 312 #define pr_alert_ratelimited(fmt, ...)                                  \
 313         printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 314 #define pr_crit_ratelimited(fmt, ...)                                   \
 315         printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 316 #define pr_err_ratelimited(fmt, ...)                                    \
 317         printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 318 #define pr_warn_ratelimited(fmt, ...)                                   \
 319         printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 320 #define pr_notice_ratelimited(fmt, ...)                                 \
 321         printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 322 #define pr_info_ratelimited(fmt, ...)                                   \
 323         printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 324 /* no pr_cont_ratelimited, don't do that... */
 325
 326 #if defined(DEBUG)
 327 #define pr_devel_ratelimited(fmt, ...)                                  \
 328         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 329 #else
 330 #define pr_devel_ratelimited(fmt, ...)                                  \
 331         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 332 #endif
 333
 334 /* If you are writing a driver, please use dev_dbg instead */
 335 #if defined(DEBUG)
 336 #define pr_debug_ratelimited(fmt, ...)                                  \
 337         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 338 #else
 339 #define pr_debug_ratelimited(fmt, ...) \
 340         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 341 #endif
 342
 343 extern const struct file_operations kmsg_fops;
 344
 345 enum {
 346         DUMP_PREFIX_NONE,
 347         DUMP_PREFIX_ADDRESS,
 348         DUMP_PREFIX_OFFSET
 349 };
 350 extern void hex_dump_to_buffer(const void *buf, size_t len,
 351                                int rowsize, int groupsize,
 352                                char *linebuf, size_t linebuflen, bool ascii);
 353 #ifdef CONFIG_PRINTK
 354 extern void print_hex_dump(const char *level, const char *prefix_str,
 355                            int prefix_type, int rowsize, int groupsize,
 356                            const void *buf, size_t len, bool ascii);
 357 #if defined(CONFIG_DYNAMIC_DEBUG)
 358 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
 359         dynamic_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true)
 360 #else
 361 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 362                                  const void *buf, size_t len);
 363 #endif /* defined(CONFIG_DYNAMIC_DEBUG) */
 364 #else
 365 static inline void print_hex_dump(const char *level, const char *prefix_str,
 366                                   int prefix_type, int rowsize, int groupsize,
 367                                   const void *buf, size_t len, bool ascii)
 368 {
 369 }
 370 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 371                                         const void *buf, size_t len)
 372 {
 373 }
 374
 375 #endif
 376
 377 #if defined(CONFIG_DYNAMIC_DEBUG)
 378 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,  \
 379                              groupsize, buf, len, ascii)        \
 380         dynamic_hex_dump(prefix_str, prefix_type, rowsize,      \
 381                          groupsize, buf, len, ascii)
 382 #else
 383 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,          \
 384                              groupsize, buf, len, ascii)                \
 385         print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize,    \
 386                        groupsize, buf, len, ascii)
 387 #endif /* defined(CONFIG_DYNAMIC_DEBUG) */
 388
 389 #endif