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
   9 extern const char linux_banner[];
  10 extern const char linux_proc_banner[];
  11
  12 static inline int printk_get_level(const char *buffer)
  13 {
  14         if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
  15                 switch (buffer[1]) {
  16                 case '0' ... '7':
  17                 case 'd':       /* KERN_DEFAULT */
  18                         return buffer[1];
  19                 }
  20         }
  21         return 0;
  22 }
  23
  24 static inline const char *printk_skip_level(const char *buffer)
  25 {
  26         if (printk_get_level(buffer)) {
  27                 switch (buffer[1]) {
  28                 case '0' ... '7':
  29                 case 'd':       /* KERN_DEFAULT */
  30                         return buffer + 2;
  31                 }
  32         }
  33         return buffer;
  34 }
  35
  36 extern int console_printk[];
  37
  38 #define console_loglevel (console_printk[0])
  39 #define default_message_loglevel (console_printk[1])
  40 #define minimum_console_loglevel (console_printk[2])
  41 #define default_console_loglevel (console_printk[3])
  42
  43 static inline void console_silent(void)
  44 {
  45         console_loglevel = 0;
  46 }
  47
  48 static inline void console_verbose(void)
  49 {
  50         if (console_loglevel)
  51                 console_loglevel = 15;
  52 }
  53
  54 struct va_format {
  55         const char *fmt;
  56         va_list *va;
  57 };
  58
  59 /*
  60  * FW_BUG
  61  * Add this to a message where you are sure the firmware is buggy or behaves
  62  * really stupid or out of spec. Be aware that the responsible BIOS developer
  63  * should be able to fix this issue or at least get a concrete idea of the
  64  * problem by reading your message without the need of looking at the kernel
  65  * code.
  66  *
  67  * Use it for definite and high priority BIOS bugs.
  68  *
  69  * FW_WARN
  70  * Use it for not that clear (e.g. could the kernel messed up things already?)
  71  * and medium priority BIOS bugs.
  72  *
  73  * FW_INFO
  74  * Use this one if you want to tell the user or vendor about something
  75  * suspicious, but generally harmless related to the firmware.
  76  *
  77  * Use it for information or very low priority BIOS bugs.
  78  */
  79 #define FW_BUG          "[Firmware Bug]: "
  80 #define FW_WARN         "[Firmware Warn]: "
  81 #define FW_INFO         "[Firmware Info]: "
  82
  83 /*
  84  * HW_ERR
  85  * Add this to a message for hardware errors, so that user can report
  86  * it to hardware vendor instead of LKML or software vendor.
  87  */
  88 #define HW_ERR          "[Hardware Error]: "
  89
  90 /*
  91  * Dummy printk for disabled debugging statements to use whilst maintaining
  92  * gcc's format and side-effect checking.
  93  */
  94 static inline __printf(1, 2)
  95 int no_printk(const char *fmt, ...)
  96 {
  97         return 0;
  98 }
  99
 100 #ifdef CONFIG_EARLY_PRINTK
 101 extern asmlinkage __printf(1, 2)
 102 void early_printk(const char *fmt, ...);
 103 void early_vprintk(const char *fmt, va_list ap);
 104 #else
 105 static inline __printf(1, 2) __cold
 106 void early_printk(const char *s, ...) { }
 107 #endif
 108
 109 #ifdef CONFIG_PRINTK
 110 asmlinkage __printf(5, 0)
 111 int vprintk_emit(int facility, int level,
 112                  const char *dict, size_t dictlen,
 113                  const char *fmt, va_list args);
 114
 115 asmlinkage __printf(1, 0)
 116 int vprintk(const char *fmt, va_list args);
 117
 118 asmlinkage __printf(5, 6) __cold
 119 asmlinkage int printk_emit(int facility, int level,
 120                            const char *dict, size_t dictlen,
 121                            const char *fmt, ...);
 122
 123 asmlinkage __printf(1, 2) __cold
 124 int printk(const char *fmt, ...);
 125
 126 /*
 127  * Special printk facility for scheduler use only, _DO_NOT_USE_ !
 128  */
 129 __printf(1, 2) __cold int printk_sched(const char *fmt, ...);
 130
 131 /*
 132  * Please don't use printk_ratelimit(), because it shares ratelimiting state
 133  * with all other unrelated printk_ratelimit() callsites.  Instead use
 134  * printk_ratelimited() or plain old __ratelimit().
 135  */
 136 extern int __printk_ratelimit(const char *func);
 137 #define printk_ratelimit() __printk_ratelimit(__func__)
 138 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 139                                    unsigned int interval_msec);
 140
 141 extern int printk_delay_msec;
 142 extern int dmesg_restrict;
 143 extern int kptr_restrict;
 144
 145 extern void wake_up_klogd(void);
 146
 147 void log_buf_kexec_setup(void);
 148 void __init setup_log_buf(int early);
 149 void dump_stack_set_arch_desc(const char *fmt, ...);
 150 void dump_stack_print_info(const char *log_lvl);
 151 void show_regs_print_info(const char *log_lvl);
 152 #else
 153 static inline __printf(1, 0)
 154 int vprintk(const char *s, va_list args)
 155 {
 156         return 0;
 157 }
 158 static inline __printf(1, 2) __cold
 159 int printk(const char *s, ...)
 160 {
 161         return 0;
 162 }
 163 static inline __printf(1, 2) __cold
 164 int printk_sched(const char *s, ...)
 165 {
 166         return 0;
 167 }
 168 static inline int printk_ratelimit(void)
 169 {
 170         return 0;
 171 }
 172 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 173                                           unsigned int interval_msec)
 174 {
 175         return false;
 176 }
 177
 178 static inline void wake_up_klogd(void)
 179 {
 180 }
 181
 182 static inline void log_buf_kexec_setup(void)
 183 {
 184 }
 185
 186 static inline void setup_log_buf(int early)
 187 {
 188 }
 189
 190 static inline void dump_stack_set_arch_desc(const char *fmt, ...)
 191 {
 192 }
 193
 194 static inline void dump_stack_print_info(const char *log_lvl)
 195 {
 196 }
 197
 198 static inline void show_regs_print_info(const char *log_lvl)
 199 {
 200 }
 201 #endif
 202
 203 extern asmlinkage void dump_stack(void) __cold;
 204
 205 #ifndef pr_fmt
 206 #define pr_fmt(fmt) fmt
 207 #endif
 208
 209 #define pr_emerg(fmt, ...) \
 210         printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 211 #define pr_alert(fmt, ...) \
 212         printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 213 #define pr_crit(fmt, ...) \
 214         printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 215 #define pr_err(fmt, ...) \
 216         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 217 #define pr_warning(fmt, ...) \
 218         printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 219 #define pr_warn pr_warning
 220 #define pr_notice(fmt, ...) \
 221         printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 222 #define pr_info(fmt, ...) \
 223         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 224 #define pr_cont(fmt, ...) \
 225         printk(KERN_CONT fmt, ##__VA_ARGS__)
 226
 227 /* pr_devel() should produce zero code unless DEBUG is defined */
 228 #ifdef DEBUG
 229 #define pr_devel(fmt, ...) \
 230         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 231 #else
 232 #define pr_devel(fmt, ...) \
 233         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 234 #endif
 235
 236 /* If you are writing a driver, please use dev_dbg instead */
 237 #if defined(CONFIG_DYNAMIC_DEBUG)
 238 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
 239 #define pr_debug(fmt, ...) \
 240         dynamic_pr_debug(fmt, ##__VA_ARGS__)
 241 #elif defined(DEBUG)
 242 #define pr_debug(fmt, ...) \
 243         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 244 #else
 245 #define pr_debug(fmt, ...) \
 246         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 247 #endif
 248
 249 /*
 250  * Print a one-time message (analogous to WARN_ONCE() et al):
 251  */
 252
 253 #ifdef CONFIG_PRINTK
 254 #define printk_once(fmt, ...)                   \
 255 ({                                              \
 256         static bool __print_once;               \
 257                                                 \
 258         if (!__print_once) {                    \
 259                 __print_once = true;            \
 260                 printk(fmt, ##__VA_ARGS__);     \
 261         }                                       \
 262 })
 263 #else
 264 #define printk_once(fmt, ...)                   \
 265         no_printk(fmt, ##__VA_ARGS__)
 266 #endif
 267
 268 #define pr_emerg_once(fmt, ...)                                 \
 269         printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 270 #define pr_alert_once(fmt, ...)                                 \
 271         printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 272 #define pr_crit_once(fmt, ...)                                  \
 273         printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 274 #define pr_err_once(fmt, ...)                                   \
 275         printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 276 #define pr_warn_once(fmt, ...)                                  \
 277         printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 278 #define pr_notice_once(fmt, ...)                                \
 279         printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 280 #define pr_info_once(fmt, ...)                                  \
 281         printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 282 #define pr_cont_once(fmt, ...)                                  \
 283         printk_once(KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
 284
 285 #if defined(DEBUG)
 286 #define pr_devel_once(fmt, ...)                                 \
 287         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 288 #else
 289 #define pr_devel_once(fmt, ...)                                 \
 290         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 291 #endif
 292
 293 /* If you are writing a driver, please use dev_dbg instead */
 294 #if defined(DEBUG)
 295 #define pr_debug_once(fmt, ...)                                 \
 296         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 297 #else
 298 #define pr_debug_once(fmt, ...)                                 \
 299         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 300 #endif
 301
 302 /*
 303  * ratelimited messages with local ratelimit_state,
 304  * no local ratelimit_state used in the !PRINTK case
 305  */
 306 #ifdef CONFIG_PRINTK
 307 #define printk_ratelimited(fmt, ...)                                    \
 308 ({                                                                      \
 309         static DEFINE_RATELIMIT_STATE(_rs,                              \
 310                                       DEFAULT_RATELIMIT_INTERVAL,       \
 311                                       DEFAULT_RATELIMIT_BURST);         \
 312                                                                         \
 313         if (__ratelimit(&_rs))                                          \
 314                 printk(fmt, ##__VA_ARGS__);                             \
 315 })
 316 #else
 317 #define printk_ratelimited(fmt, ...)                                    \
 318         no_printk(fmt, ##__VA_ARGS__)
 319 #endif
 320
 321 #define pr_emerg_ratelimited(fmt, ...)                                  \
 322         printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 323 #define pr_alert_ratelimited(fmt, ...)                                  \
 324         printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 325 #define pr_crit_ratelimited(fmt, ...)                                   \
 326         printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 327 #define pr_err_ratelimited(fmt, ...)                                    \
 328         printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 329 #define pr_warn_ratelimited(fmt, ...)                                   \
 330         printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 331 #define pr_notice_ratelimited(fmt, ...)                                 \
 332         printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 333 #define pr_info_ratelimited(fmt, ...)                                   \
 334         printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 335 /* no pr_cont_ratelimited, don't do that... */
 336
 337 #if defined(DEBUG)
 338 #define pr_devel_ratelimited(fmt, ...)                                  \
 339         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 340 #else
 341 #define pr_devel_ratelimited(fmt, ...)                                  \
 342         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 343 #endif
 344
 345 /* If you are writing a driver, please use dev_dbg instead */
 346 #if defined(DEBUG)
 347 #define pr_debug_ratelimited(fmt, ...)                                  \
 348         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 349 #else
 350 #define pr_debug_ratelimited(fmt, ...) \
 351         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 352 #endif
 353
 354 extern const struct file_operations kmsg_fops;
 355
 356 enum {
 357         DUMP_PREFIX_NONE,
 358         DUMP_PREFIX_ADDRESS,
 359         DUMP_PREFIX_OFFSET
 360 };
 361 extern void hex_dump_to_buffer(const void *buf, size_t len,
 362                                int rowsize, int groupsize,
 363                                char *linebuf, size_t linebuflen, bool ascii);
 364 #ifdef CONFIG_PRINTK
 365 extern 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 #if defined(CONFIG_DYNAMIC_DEBUG)
 369 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
 370         dynamic_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true)
 371 #else
 372 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 373                                  const void *buf, size_t len);
 374 #endif /* defined(CONFIG_DYNAMIC_DEBUG) */
 375 #else
 376 static inline void print_hex_dump(const char *level, const char *prefix_str,
 377                                   int prefix_type, int rowsize, int groupsize,
 378                                   const void *buf, size_t len, bool ascii)
 379 {
 380 }
 381 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 382                                         const void *buf, size_t len)
 383 {
 384 }
 385
 386 #endif
 387
 388 #if defined(CONFIG_DYNAMIC_DEBUG)
 389 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,  \
 390                              groupsize, buf, len, ascii)        \
 391         dynamic_hex_dump(prefix_str, prefix_type, rowsize,      \
 392                          groupsize, buf, len, ascii)
 393 #else
 394 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,          \
 395                              groupsize, buf, len, ascii)                \
 396         print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize,    \
 397                        groupsize, buf, len, ascii)
 398 #endif /* defined(CONFIG_DYNAMIC_DEBUG) */
 399
 400 #endif