1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __KERNEL_PRINTK__ 3 #define __KERNEL_PRINTK__ 4 5 #include <stdarg.h> 6 #include <linux/init.h> 7 #include <linux/kern_levels.h> 8 #include <linux/linkage.h> 9 #include <linux/cache.h> 10 11 extern const char linux_banner[]; 12 extern const char linux_proc_banner[]; 13 14 #define PRINTK_MAX_SINGLE_HEADER_LEN 2 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 case 'c': /* KERN_CONT */ 23 return buffer[1]; 24 } 25 } 26 return 0; 27 } 28 29 static inline const char *printk_skip_level(const char *buffer) 30 { 31 if (printk_get_level(buffer)) 32 return buffer + 2; 33 34 return buffer; 35 } 36 37 static inline const char *printk_skip_headers(const char *buffer) 38 { 39 while (printk_get_level(buffer)) 40 buffer = printk_skip_level(buffer); 41 42 return buffer; 43 } 44 45 #define CONSOLE_EXT_LOG_MAX 8192 46 47 /* printk's without a loglevel use this.. */ 48 #define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT 49 50 /* We show everything that is MORE important than this.. */ 51 #define CONSOLE_LOGLEVEL_SILENT 0 /* Mum's the word */ 52 #define CONSOLE_LOGLEVEL_MIN 1 /* Minimum loglevel we let people use */ 53 #define CONSOLE_LOGLEVEL_QUIET 4 /* Shhh ..., when booted with "quiet" */ 54 #define CONSOLE_LOGLEVEL_DEBUG 10 /* issue debug messages */ 55 #define CONSOLE_LOGLEVEL_MOTORMOUTH 15 /* You can't shut this one up */ 56 57 /* 58 * Default used to be hard-coded at 7, we're now allowing it to be set from 59 * kernel config. 60 */ 61 #define CONSOLE_LOGLEVEL_DEFAULT CONFIG_CONSOLE_LOGLEVEL_DEFAULT 62 63 extern int console_printk[]; 64 65 #define console_loglevel (console_printk[0]) 66 #define default_message_loglevel (console_printk[1]) 67 #define minimum_console_loglevel (console_printk[2]) 68 #define default_console_loglevel (console_printk[3]) 69 70 static inline void console_silent(void) 71 { 72 console_loglevel = CONSOLE_LOGLEVEL_SILENT; 73 } 74 75 static inline void console_verbose(void) 76 { 77 if (console_loglevel) 78 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH; 79 } 80 81 /* strlen("ratelimit") + 1 */ 82 #define DEVKMSG_STR_MAX_SIZE 10 83 extern char devkmsg_log_str[]; 84 struct ctl_table; 85 86 struct va_format { 87 const char *fmt; 88 va_list *va; 89 }; 90 91 /* 92 * FW_BUG 93 * Add this to a message where you are sure the firmware is buggy or behaves 94 * really stupid or out of spec. Be aware that the responsible BIOS developer 95 * should be able to fix this issue or at least get a concrete idea of the 96 * problem by reading your message without the need of looking at the kernel 97 * code. 98 * 99 * Use it for definite and high priority BIOS bugs. 100 * 101 * FW_WARN 102 * Use it for not that clear (e.g. could the kernel messed up things already?) 103 * and medium priority BIOS bugs. 104 * 105 * FW_INFO 106 * Use this one if you want to tell the user or vendor about something 107 * suspicious, but generally harmless related to the firmware. 108 * 109 * Use it for information or very low priority BIOS bugs. 110 */ 111 #define FW_BUG "[Firmware Bug]: " 112 #define FW_WARN "[Firmware Warn]: " 113 #define FW_INFO "[Firmware Info]: " 114 115 /* 116 * HW_ERR 117 * Add this to a message for hardware errors, so that user can report 118 * it to hardware vendor instead of LKML or software vendor. 119 */ 120 #define HW_ERR "[Hardware Error]: " 121 122 /* 123 * DEPRECATED 124 * Add this to a message whenever you want to warn user space about the use 125 * of a deprecated aspect of an API so they can stop using it 126 */ 127 #define DEPRECATED "[Deprecated]: " 128 129 /* 130 * Dummy printk for disabled debugging statements to use whilst maintaining 131 * gcc's format checking. 132 */ 133 #define no_printk(fmt, ...) \ 134 ({ \ 135 do { \ 136 if (0) \ 137 printk(fmt, ##__VA_ARGS__); \ 138 } while (0); \ 139 0; \ 140 }) 141 142 #ifdef CONFIG_EARLY_PRINTK 143 extern asmlinkage __printf(1, 2) 144 void early_printk(const char *fmt, ...); 145 #else 146 static inline __printf(1, 2) __cold 147 void early_printk(const char *s, ...) { } 148 #endif 149 150 #ifdef CONFIG_PRINTK_NMI 151 extern void printk_nmi_enter(void); 152 extern void printk_nmi_exit(void); 153 #else 154 static inline void printk_nmi_enter(void) { } 155 static inline void printk_nmi_exit(void) { } 156 #endif /* PRINTK_NMI */ 157 158 #ifdef CONFIG_PRINTK 159 asmlinkage __printf(5, 0) 160 int vprintk_emit(int facility, int level, 161 const char *dict, size_t dictlen, 162 const char *fmt, va_list args); 163 164 asmlinkage __printf(1, 0) 165 int vprintk(const char *fmt, va_list args); 166 167 asmlinkage __printf(5, 6) __cold 168 int printk_emit(int facility, int level, 169 const char *dict, size_t dictlen, 170 const char *fmt, ...); 171 172 asmlinkage __printf(1, 2) __cold 173 int printk(const char *fmt, ...); 174 175 /* 176 * Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ ! 177 */ 178 __printf(1, 2) __cold int printk_deferred(const char *fmt, ...); 179 180 /* 181 * Please don't use printk_ratelimit(), because it shares ratelimiting state 182 * with all other unrelated printk_ratelimit() callsites. Instead use 183 * printk_ratelimited() or plain old __ratelimit(). 184 */ 185 extern int __printk_ratelimit(const char *func); 186 #define printk_ratelimit() __printk_ratelimit(__func__) 187 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, 188 unsigned int interval_msec); 189 190 extern int printk_delay_msec; 191 extern int dmesg_restrict; 192 extern int kptr_restrict; 193 194 extern int 195 devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, void __user *buf, 196 size_t *lenp, loff_t *ppos); 197 198 extern void wake_up_klogd(void); 199 200 char *log_buf_addr_get(void); 201 u32 log_buf_len_get(void); 202 void log_buf_vmcoreinfo_setup(void); 203 void __init setup_log_buf(int early); 204 __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...); 205 void dump_stack_print_info(const char *log_lvl); 206 void show_regs_print_info(const char *log_lvl); 207 extern void printk_safe_init(void); 208 extern void printk_safe_flush(void); 209 extern void printk_safe_flush_on_panic(void); 210 #else 211 static inline __printf(1, 0) 212 int vprintk(const char *s, va_list args) 213 { 214 return 0; 215 } 216 static inline __printf(1, 2) __cold 217 int printk(const char *s, ...) 218 { 219 return 0; 220 } 221 static inline __printf(1, 2) __cold 222 int printk_deferred(const char *s, ...) 223 { 224 return 0; 225 } 226 static inline int printk_ratelimit(void) 227 { 228 return 0; 229 } 230 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, 231 unsigned int interval_msec) 232 { 233 return false; 234 } 235 236 static inline void wake_up_klogd(void) 237 { 238 } 239 240 static inline char *log_buf_addr_get(void) 241 { 242 return NULL; 243 } 244 245 static inline u32 log_buf_len_get(void) 246 { 247 return 0; 248 } 249 250 static inline void log_buf_vmcoreinfo_setup(void) 251 { 252 } 253 254 static inline void setup_log_buf(int early) 255 { 256 } 257 258 static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...) 259 { 260 } 261 262 static inline void dump_stack_print_info(const char *log_lvl) 263 { 264 } 265 266 static inline void show_regs_print_info(const char *log_lvl) 267 { 268 } 269 270 static inline void printk_safe_init(void) 271 { 272 } 273 274 static inline void printk_safe_flush(void) 275 { 276 } 277 278 static inline void printk_safe_flush_on_panic(void) 279 { 280 } 281 #endif 282 283 extern asmlinkage void dump_stack(void) __cold; 284 285 #ifndef pr_fmt 286 #define pr_fmt(fmt) fmt 287 #endif 288 289 /* 290 * These can be used to print at the various log levels. 291 * All of these will print unconditionally, although note that pr_debug() 292 * and other debug macros are compiled out unless either DEBUG is defined 293 * or CONFIG_DYNAMIC_DEBUG is set. 294 */ 295 #define pr_emerg(fmt, ...) \ 296 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 297 #define pr_alert(fmt, ...) \ 298 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 299 #define pr_crit(fmt, ...) \ 300 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 301 #define pr_err(fmt, ...) \ 302 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 303 #define pr_warning(fmt, ...) \ 304 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 305 #define pr_warn pr_warning 306 #define pr_notice(fmt, ...) \ 307 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 308 #define pr_info(fmt, ...) \ 309 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 310 /* 311 * Like KERN_CONT, pr_cont() should only be used when continuing 312 * a line with no newline ('\n') enclosed. Otherwise it defaults 313 * back to KERN_DEFAULT. 314 */ 315 #define pr_cont(fmt, ...) \ 316 printk(KERN_CONT fmt, ##__VA_ARGS__) 317 318 /* pr_devel() should produce zero code unless DEBUG is defined */ 319 #ifdef DEBUG 320 #define pr_devel(fmt, ...) \ 321 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 322 #else 323 #define pr_devel(fmt, ...) \ 324 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 325 #endif 326 327 328 /* If you are writing a driver, please use dev_dbg instead */ 329 #if defined(CONFIG_DYNAMIC_DEBUG) 330 #include <linux/dynamic_debug.h> 331 332 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */ 333 #define pr_debug(fmt, ...) \ 334 dynamic_pr_debug(fmt, ##__VA_ARGS__) 335 #elif defined(DEBUG) 336 #define pr_debug(fmt, ...) \ 337 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 338 #else 339 #define pr_debug(fmt, ...) \ 340 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 341 #endif 342 343 /* 344 * Print a one-time message (analogous to WARN_ONCE() et al): 345 */ 346 347 #ifdef CONFIG_PRINTK 348 #define printk_once(fmt, ...) \ 349 ({ \ 350 static bool __print_once __read_mostly; \ 351 bool __ret_print_once = !__print_once; \ 352 \ 353 if (!__print_once) { \ 354 __print_once = true; \ 355 printk(fmt, ##__VA_ARGS__); \ 356 } \ 357 unlikely(__ret_print_once); \ 358 }) 359 #define printk_deferred_once(fmt, ...) \ 360 ({ \ 361 static bool __print_once __read_mostly; \ 362 bool __ret_print_once = !__print_once; \ 363 \ 364 if (!__print_once) { \ 365 __print_once = true; \ 366 printk_deferred(fmt, ##__VA_ARGS__); \ 367 } \ 368 unlikely(__ret_print_once); \ 369 }) 370 #else 371 #define printk_once(fmt, ...) \ 372 no_printk(fmt, ##__VA_ARGS__) 373 #define printk_deferred_once(fmt, ...) \ 374 no_printk(fmt, ##__VA_ARGS__) 375 #endif 376 377 #define pr_emerg_once(fmt, ...) \ 378 printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 379 #define pr_alert_once(fmt, ...) \ 380 printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 381 #define pr_crit_once(fmt, ...) \ 382 printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 383 #define pr_err_once(fmt, ...) \ 384 printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 385 #define pr_warn_once(fmt, ...) \ 386 printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 387 #define pr_notice_once(fmt, ...) \ 388 printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 389 #define pr_info_once(fmt, ...) \ 390 printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 391 #define pr_cont_once(fmt, ...) \ 392 printk_once(KERN_CONT pr_fmt(fmt), ##__VA_ARGS__) 393 394 #if defined(DEBUG) 395 #define pr_devel_once(fmt, ...) \ 396 printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 397 #else 398 #define pr_devel_once(fmt, ...) \ 399 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 400 #endif 401 402 /* If you are writing a driver, please use dev_dbg instead */ 403 #if defined(DEBUG) 404 #define pr_debug_once(fmt, ...) \ 405 printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 406 #else 407 #define pr_debug_once(fmt, ...) \ 408 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 409 #endif 410 411 /* 412 * ratelimited messages with local ratelimit_state, 413 * no local ratelimit_state used in the !PRINTK case 414 */ 415 #ifdef CONFIG_PRINTK 416 #define printk_ratelimited(fmt, ...) \ 417 ({ \ 418 static DEFINE_RATELIMIT_STATE(_rs, \ 419 DEFAULT_RATELIMIT_INTERVAL, \ 420 DEFAULT_RATELIMIT_BURST); \ 421 \ 422 if (__ratelimit(&_rs)) \ 423 printk(fmt, ##__VA_ARGS__); \ 424 }) 425 #else 426 #define printk_ratelimited(fmt, ...) \ 427 no_printk(fmt, ##__VA_ARGS__) 428 #endif 429 430 #define pr_emerg_ratelimited(fmt, ...) \ 431 printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 432 #define pr_alert_ratelimited(fmt, ...) \ 433 printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 434 #define pr_crit_ratelimited(fmt, ...) \ 435 printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 436 #define pr_err_ratelimited(fmt, ...) \ 437 printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 438 #define pr_warn_ratelimited(fmt, ...) \ 439 printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 440 #define pr_notice_ratelimited(fmt, ...) \ 441 printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 442 #define pr_info_ratelimited(fmt, ...) \ 443 printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 444 /* no pr_cont_ratelimited, don't do that... */ 445 446 #if defined(DEBUG) 447 #define pr_devel_ratelimited(fmt, ...) \ 448 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 449 #else 450 #define pr_devel_ratelimited(fmt, ...) \ 451 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 452 #endif 453 454 /* If you are writing a driver, please use dev_dbg instead */ 455 #if defined(CONFIG_DYNAMIC_DEBUG) 456 /* descriptor check is first to prevent flooding with "callbacks suppressed" */ 457 #define pr_debug_ratelimited(fmt, ...) \ 458 do { \ 459 static DEFINE_RATELIMIT_STATE(_rs, \ 460 DEFAULT_RATELIMIT_INTERVAL, \ 461 DEFAULT_RATELIMIT_BURST); \ 462 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt)); \ 463 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \ 464 __ratelimit(&_rs)) \ 465 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__); \ 466 } while (0) 467 #elif defined(DEBUG) 468 #define pr_debug_ratelimited(fmt, ...) \ 469 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 470 #else 471 #define pr_debug_ratelimited(fmt, ...) \ 472 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 473 #endif 474 475 extern const struct file_operations kmsg_fops; 476 477 enum { 478 DUMP_PREFIX_NONE, 479 DUMP_PREFIX_ADDRESS, 480 DUMP_PREFIX_OFFSET 481 }; 482 extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, 483 int groupsize, char *linebuf, size_t linebuflen, 484 bool ascii); 485 #ifdef CONFIG_PRINTK 486 extern void print_hex_dump(const char *level, const char *prefix_str, 487 int prefix_type, int rowsize, int groupsize, 488 const void *buf, size_t len, bool ascii); 489 #if defined(CONFIG_DYNAMIC_DEBUG) 490 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \ 491 dynamic_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true) 492 #else 493 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, 494 const void *buf, size_t len); 495 #endif /* defined(CONFIG_DYNAMIC_DEBUG) */ 496 #else 497 static inline void print_hex_dump(const char *level, const char *prefix_str, 498 int prefix_type, int rowsize, int groupsize, 499 const void *buf, size_t len, bool ascii) 500 { 501 } 502 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type, 503 const void *buf, size_t len) 504 { 505 } 506 507 #endif 508 509 #if defined(CONFIG_DYNAMIC_DEBUG) 510 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \ 511 groupsize, buf, len, ascii) \ 512 dynamic_hex_dump(prefix_str, prefix_type, rowsize, \ 513 groupsize, buf, len, ascii) 514 #elif defined(DEBUG) 515 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \ 516 groupsize, buf, len, ascii) \ 517 print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize, \ 518 groupsize, buf, len, ascii) 519 #else 520 static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type, 521 int rowsize, int groupsize, 522 const void *buf, size_t len, bool ascii) 523 { 524 } 525 #endif 526 527 #endif 528