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                 switch (buffer[1]) {
  29                 case '0' ... '7':
  30                 case 'd':       /* KERN_DEFAULT */
  31                         return buffer + 2;
  32                 }
  33         }
  34         return buffer;
  35 }
  36
  37 extern int console_printk[];
  38
  39 #define console_loglevel (console_printk[0])
  40 #define default_message_loglevel (console_printk[1])
  41 #define minimum_console_loglevel (console_printk[2])
  42 #define default_console_loglevel (console_printk[3])
  43
  44 static inline void console_silent(void)
  45 {
  46         console_loglevel = 0;
  47 }
  48
  49 static inline void console_verbose(void)
  50 {
  51         if (console_loglevel)
  52                 console_loglevel = 15;
  53 }
  54
  55 struct va_format {
  56         const char *fmt;
  57         va_list *va;
  58 };
  59
  60 /*
  61  * FW_BUG
  62  * Add this to a message where you are sure the firmware is buggy or behaves
  63  * really stupid or out of spec. Be aware that the responsible BIOS developer
  64  * should be able to fix this issue or at least get a concrete idea of the
  65  * problem by reading your message without the need of looking at the kernel
  66  * code.
  67  *
  68  * Use it for definite and high priority BIOS bugs.
  69  *
  70  * FW_WARN
  71  * Use it for not that clear (e.g. could the kernel messed up things already?)
  72  * and medium priority BIOS bugs.
  73  *
  74  * FW_INFO
  75  * Use this one if you want to tell the user or vendor about something
  76  * suspicious, but generally harmless related to the firmware.
  77  *
  78  * Use it for information or very low priority BIOS bugs.
  79  */
  80 #define FW_BUG          "[Firmware Bug]: "
  81 #define FW_WARN         "[Firmware Warn]: "
  82 #define FW_INFO         "[Firmware Info]: "
  83
  84 /*
  85  * HW_ERR
  86  * Add this to a message for hardware errors, so that user can report
  87  * it to hardware vendor instead of LKML or software vendor.
  88  */
  89 #define HW_ERR          "[Hardware Error]: "
  90
  91 /*
  92  * DEPRECATED
  93  * Add this to a message whenever you want to warn user space about the use
  94  * of a deprecated aspect of an API so they can stop using it
  95  */
  96 #define DEPRECATED      "[Deprecated]: "
  97
  98 /*
  99  * Dummy printk for disabled debugging statements to use whilst maintaining
 100  * gcc's format and side-effect checking.
 101  */
 102 static inline __printf(1, 2)
 103 int no_printk(const char *fmt, ...)
 104 {
 105         return 0;
 106 }
 107
 108 #ifdef CONFIG_EARLY_PRINTK
 109 extern asmlinkage __printf(1, 2)
 110 void early_printk(const char *fmt, ...);
 111 void early_vprintk(const char *fmt, va_list ap);
 112 #else
 113 static inline __printf(1, 2) __cold
 114 void early_printk(const char *s, ...) { }
 115 #endif
 116
 117 #ifdef CONFIG_PRINTK
 118 asmlinkage __printf(5, 0)
 119 int vprintk_emit(int facility, int level,
 120                  const char *dict, size_t dictlen,
 121                  const char *fmt, va_list args);
 122
 123 asmlinkage __printf(1, 0)
 124 int vprintk(const char *fmt, va_list args);
 125
 126 asmlinkage __printf(5, 6) __cold
 127 asmlinkage int printk_emit(int facility, int level,
 128                            const char *dict, size_t dictlen,
 129                            const char *fmt, ...);
 130
 131 asmlinkage __printf(1, 2) __cold
 132 int printk(const char *fmt, ...);
 133
 134 /*
 135  * Special printk facility for scheduler use only, _DO_NOT_USE_ !
 136  */
 137 __printf(1, 2) __cold int printk_sched(const char *fmt, ...);
 138
 139 /*
 140  * Please don't use printk_ratelimit(), because it shares ratelimiting state
 141  * with all other unrelated printk_ratelimit() callsites.  Instead use
 142  * printk_ratelimited() or plain old __ratelimit().
 143  */
 144 extern int __printk_ratelimit(const char *func);
 145 #define printk_ratelimit() __printk_ratelimit(__func__)
 146 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 147                                    unsigned int interval_msec);
 148
 149 extern int printk_delay_msec;
 150 extern int dmesg_restrict;
 151 extern int kptr_restrict;
 152
 153 extern void wake_up_klogd(void);
 154
 155 void log_buf_kexec_setup(void);
 156 void __init setup_log_buf(int early);
 157 void dump_stack_set_arch_desc(const char *fmt, ...);
 158 void dump_stack_print_info(const char *log_lvl);
 159 void show_regs_print_info(const char *log_lvl);
 160 #else
 161 static inline __printf(1, 0)
 162 int vprintk(const char *s, va_list args)
 163 {
 164         return 0;
 165 }
 166 static inline __printf(1, 2) __cold
 167 int printk(const char *s, ...)
 168 {
 169         return 0;
 170 }
 171 static inline __printf(1, 2) __cold
 172 int printk_sched(const char *s, ...)
 173 {
 174         return 0;
 175 }
 176 static inline int printk_ratelimit(void)
 177 {
 178         return 0;
 179 }
 180 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
 181                                           unsigned int interval_msec)
 182 {
 183         return false;
 184 }
 185
 186 static inline void wake_up_klogd(void)
 187 {
 188 }
 189
 190 static inline void log_buf_kexec_setup(void)
 191 {
 192 }
 193
 194 static inline void setup_log_buf(int early)
 195 {
 196 }
 197
 198 static inline void dump_stack_set_arch_desc(const char *fmt, ...)
 199 {
 200 }
 201
 202 static inline void dump_stack_print_info(const char *log_lvl)
 203 {
 204 }
 205
 206 static inline void show_regs_print_info(const char *log_lvl)
 207 {
 208 }
 209 #endif
 210
 211 extern asmlinkage void dump_stack(void) __cold;
 212
 213 #ifndef pr_fmt
 214 #define pr_fmt(fmt) fmt
 215 #endif
 216
 217 #define pr_emerg(fmt, ...) \
 218         printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 219 #define pr_alert(fmt, ...) \
 220         printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 221 #define pr_crit(fmt, ...) \
 222         printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 223 #define pr_err(fmt, ...) \
 224         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 225 #define pr_warning(fmt, ...) \
 226         printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 227 #define pr_warn pr_warning
 228 #define pr_notice(fmt, ...) \
 229         printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 230 #define pr_info(fmt, ...) \
 231         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 232 #define pr_cont(fmt, ...) \
 233         printk(KERN_CONT fmt, ##__VA_ARGS__)
 234
 235 /* pr_devel() should produce zero code unless DEBUG is defined */
 236 #ifdef DEBUG
 237 #define pr_devel(fmt, ...) \
 238         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 239 #else
 240 #define pr_devel(fmt, ...) \
 241         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 242 #endif
 243
 244 #include <linux/dynamic_debug.h>
 245
 246 /* If you are writing a driver, please use dev_dbg instead */
 247 #if defined(CONFIG_DYNAMIC_DEBUG)
 248 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
 249 #define pr_debug(fmt, ...) \
 250         dynamic_pr_debug(fmt, ##__VA_ARGS__)
 251 #elif defined(DEBUG)
 252 #define pr_debug(fmt, ...) \
 253         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 254 #else
 255 #define pr_debug(fmt, ...) \
 256         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 257 #endif
 258
 259 /*
 260  * Print a one-time message (analogous to WARN_ONCE() et al):
 261  */
 262
 263 #ifdef CONFIG_PRINTK
 264 #define printk_once(fmt, ...)                                   \
 265 ({                                                              \
 266         static bool __print_once __read_mostly;                 \
 267                                                                 \
 268         if (!__print_once) {                                    \
 269                 __print_once = true;                            \
 270                 printk(fmt, ##__VA_ARGS__);                     \
 271         }                                                       \
 272 })
 273 #else
 274 #define printk_once(fmt, ...)                                   \
 275         no_printk(fmt, ##__VA_ARGS__)
 276 #endif
 277
 278 #define pr_emerg_once(fmt, ...)                                 \
 279         printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 280 #define pr_alert_once(fmt, ...)                                 \
 281         printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 282 #define pr_crit_once(fmt, ...)                                  \
 283         printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 284 #define pr_err_once(fmt, ...)                                   \
 285         printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 286 #define pr_warn_once(fmt, ...)                                  \
 287         printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 288 #define pr_notice_once(fmt, ...)                                \
 289         printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 290 #define pr_info_once(fmt, ...)                                  \
 291         printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 292 #define pr_cont_once(fmt, ...)                                  \
 293         printk_once(KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
 294
 295 #if defined(DEBUG)
 296 #define pr_devel_once(fmt, ...)                                 \
 297         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 298 #else
 299 #define pr_devel_once(fmt, ...)                                 \
 300         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 301 #endif
 302
 303 /* If you are writing a driver, please use dev_dbg instead */
 304 #if defined(DEBUG)
 305 #define pr_debug_once(fmt, ...)                                 \
 306         printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 307 #else
 308 #define pr_debug_once(fmt, ...)                                 \
 309         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 310 #endif
 311
 312 /*
 313  * ratelimited messages with local ratelimit_state,
 314  * no local ratelimit_state used in the !PRINTK case
 315  */
 316 #ifdef CONFIG_PRINTK
 317 #define printk_ratelimited(fmt, ...)                                    \
 318 ({                                                                      \
 319         static DEFINE_RATELIMIT_STATE(_rs,                              \
 320                                       DEFAULT_RATELIMIT_INTERVAL,       \
 321                                       DEFAULT_RATELIMIT_BURST);         \
 322                                                                         \
 323         if (__ratelimit(&_rs))                                          \
 324                 printk(fmt, ##__VA_ARGS__);                             \
 325 })
 326 #else
 327 #define printk_ratelimited(fmt, ...)                                    \
 328         no_printk(fmt, ##__VA_ARGS__)
 329 #endif
 330
 331 #define pr_emerg_ratelimited(fmt, ...)                                  \
 332         printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 333 #define pr_alert_ratelimited(fmt, ...)                                  \
 334         printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 335 #define pr_crit_ratelimited(fmt, ...)                                   \
 336         printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 337 #define pr_err_ratelimited(fmt, ...)                                    \
 338         printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 339 #define pr_warn_ratelimited(fmt, ...)                                   \
 340         printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 341 #define pr_notice_ratelimited(fmt, ...)                                 \
 342         printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 343 #define pr_info_ratelimited(fmt, ...)                                   \
 344         printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 345 /* no pr_cont_ratelimited, don't do that... */
 346
 347 #if defined(DEBUG)
 348 #define pr_devel_ratelimited(fmt, ...)                                  \
 349         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 350 #else
 351 #define pr_devel_ratelimited(fmt, ...)                                  \
 352         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 353 #endif
 354
 355 /* If you are writing a driver, please use dev_dbg instead */
 356 #if defined(CONFIG_DYNAMIC_DEBUG)
 357 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
 358 #define pr_debug_ratelimited(fmt, ...)                                  \
 359 do {                                                                    \
 360         static DEFINE_RATELIMIT_STATE(_rs,                              \
 361                                       DEFAULT_RATELIMIT_INTERVAL,       \
 362                                       DEFAULT_RATELIMIT_BURST);         \
 363         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
 364         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) &&        \
 365             __ratelimit(&_rs))                                          \
 366                 __dynamic_pr_debug(&descriptor, fmt, ##__VA_ARGS__);    \
 367 } while (0)
 368 #elif defined(DEBUG)
 369 #define pr_debug_ratelimited(fmt, ...)                                  \
 370         printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 371 #else
 372 #define pr_debug_ratelimited(fmt, ...) \
 373         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 374 #endif
 375
 376 extern const struct file_operations kmsg_fops;
 377
 378 enum {
 379         DUMP_PREFIX_NONE,
 380         DUMP_PREFIX_ADDRESS,
 381         DUMP_PREFIX_OFFSET
 382 };
 383 extern void hex_dump_to_buffer(const void *buf, size_t len,
 384                                int rowsize, int groupsize,
 385                                char *linebuf, size_t linebuflen, bool ascii);
 386 #ifdef CONFIG_PRINTK
 387 extern void print_hex_dump(const char *level, const char *prefix_str,
 388                            int prefix_type, int rowsize, int groupsize,
 389                            const void *buf, size_t len, bool ascii);
 390 #if defined(CONFIG_DYNAMIC_DEBUG)
 391 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
 392         dynamic_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true)
 393 #else
 394 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 395                                  const void *buf, size_t len);
 396 #endif /* defined(CONFIG_DYNAMIC_DEBUG) */
 397 #else
 398 static inline void print_hex_dump(const char *level, const char *prefix_str,
 399                                   int prefix_type, int rowsize, int groupsize,
 400                                   const void *buf, size_t len, bool ascii)
 401 {
 402 }
 403 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 404                                         const void *buf, size_t len)
 405 {
 406 }
 407
 408 #endif
 409
 410 #if defined(CONFIG_DYNAMIC_DEBUG)
 411 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,  \
 412                              groupsize, buf, len, ascii)        \
 413         dynamic_hex_dump(prefix_str, prefix_type, rowsize,      \
 414                          groupsize, buf, len, ascii)
 415 #else
 416 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,          \
 417                              groupsize, buf, len, ascii)                \
 418         print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize,    \
 419                        groupsize, buf, len, ascii)
 420 #endif /* defined(CONFIG_DYNAMIC_DEBUG) */
 421
 422 #endif