1 #ifndef __KERNEL_PRINTK__ 2 #define __KERNEL_PRINTK__ 3 4 #include <linux/init.h> 5 #include <linux/kern_levels.h> 6 7 extern const char linux_banner[]; 8 extern const char linux_proc_banner[]; 9 10 static inline int printk_get_level(const char *buffer) 11 { 12 if (buffer[0] == KERN_SOH_ASCII && buffer[1]) { 13 switch (buffer[1]) { 14 case '0' ... '7': 15 case 'd': /* KERN_DEFAULT */ 16 return buffer[1]; 17 } 18 } 19 return 0; 20 } 21 22 static inline const char *printk_skip_level(const char *buffer) 23 { 24 if (printk_get_level(buffer)) { 25 switch (buffer[1]) { 26 case '0' ... '7': 27 case 'd': /* KERN_DEFAULT */ 28 return buffer + 2; 29 } 30 } 31 return buffer; 32 } 33 34 extern int console_printk[]; 35 36 #define console_loglevel (console_printk[0]) 37 #define default_message_loglevel (console_printk[1]) 38 #define minimum_console_loglevel (console_printk[2]) 39 #define default_console_loglevel (console_printk[3]) 40 41 static inline void console_silent(void) 42 { 43 console_loglevel = 0; 44 } 45 46 static inline void console_verbose(void) 47 { 48 if (console_loglevel) 49 console_loglevel = 15; 50 } 51 52 struct va_format { 53 const char *fmt; 54 va_list *va; 55 }; 56 57 /* 58 * FW_BUG 59 * Add this to a message where you are sure the firmware is buggy or behaves 60 * really stupid or out of spec. Be aware that the responsible BIOS developer 61 * should be able to fix this issue or at least get a concrete idea of the 62 * problem by reading your message without the need of looking at the kernel 63 * code. 64 * 65 * Use it for definite and high priority BIOS bugs. 66 * 67 * FW_WARN 68 * Use it for not that clear (e.g. could the kernel messed up things already?) 69 * and medium priority BIOS bugs. 70 * 71 * FW_INFO 72 * Use this one if you want to tell the user or vendor about something 73 * suspicious, but generally harmless related to the firmware. 74 * 75 * Use it for information or very low priority BIOS bugs. 76 */ 77 #define FW_BUG "[Firmware Bug]: " 78 #define FW_WARN "[Firmware Warn]: " 79 #define FW_INFO "[Firmware Info]: " 80 81 /* 82 * HW_ERR 83 * Add this to a message for hardware errors, so that user can report 84 * it to hardware vendor instead of LKML or software vendor. 85 */ 86 #define HW_ERR "[Hardware Error]: " 87 88 /* 89 * Dummy printk for disabled debugging statements to use whilst maintaining 90 * gcc's format and side-effect checking. 91 */ 92 static inline __printf(1, 2) 93 int no_printk(const char *fmt, ...) 94 { 95 return 0; 96 } 97 98 extern asmlinkage __printf(1, 2) 99 void early_printk(const char *fmt, ...); 100 101 extern int printk_needs_cpu(int cpu); 102 extern void printk_tick(void); 103 104 #ifdef CONFIG_PRINTK 105 asmlinkage __printf(5, 0) 106 int vprintk_emit(int facility, int level, 107 const char *dict, size_t dictlen, 108 const char *fmt, va_list args); 109 110 asmlinkage __printf(1, 0) 111 int vprintk(const char *fmt, va_list args); 112 113 asmlinkage __printf(5, 6) __cold 114 asmlinkage int printk_emit(int facility, int level, 115 const char *dict, size_t dictlen, 116 const char *fmt, ...); 117 118 asmlinkage __printf(1, 2) __cold 119 int printk(const char *fmt, ...); 120 121 /* 122 * Special printk facility for scheduler use only, _DO_NOT_USE_ ! 123 */ 124 __printf(1, 2) __cold int printk_sched(const char *fmt, ...); 125 126 /* 127 * Please don't use printk_ratelimit(), because it shares ratelimiting state 128 * with all other unrelated printk_ratelimit() callsites. Instead use 129 * printk_ratelimited() or plain old __ratelimit(). 130 */ 131 extern int __printk_ratelimit(const char *func); 132 #define printk_ratelimit() __printk_ratelimit(__func__) 133 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, 134 unsigned int interval_msec); 135 136 extern int printk_delay_msec; 137 extern int dmesg_restrict; 138 extern int kptr_restrict; 139 140 void log_buf_kexec_setup(void); 141 void __init setup_log_buf(int early); 142 #else 143 static inline __printf(1, 0) 144 int vprintk(const char *s, va_list args) 145 { 146 return 0; 147 } 148 static inline __printf(1, 2) __cold 149 int printk(const char *s, ...) 150 { 151 return 0; 152 } 153 static inline __printf(1, 2) __cold 154 int printk_sched(const char *s, ...) 155 { 156 return 0; 157 } 158 static inline int printk_ratelimit(void) 159 { 160 return 0; 161 } 162 static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, 163 unsigned int interval_msec) 164 { 165 return false; 166 } 167 168 static inline void log_buf_kexec_setup(void) 169 { 170 } 171 172 static inline void setup_log_buf(int early) 173 { 174 } 175 #endif 176 177 extern void dump_stack(void) __cold; 178 179 #ifndef pr_fmt 180 #define pr_fmt(fmt) fmt 181 #endif 182 183 #define pr_emerg(fmt, ...) \ 184 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 185 #define pr_alert(fmt, ...) \ 186 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 187 #define pr_crit(fmt, ...) \ 188 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 189 #define pr_err(fmt, ...) \ 190 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 191 #define pr_warning(fmt, ...) \ 192 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 193 #define pr_warn pr_warning 194 #define pr_notice(fmt, ...) \ 195 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 196 #define pr_info(fmt, ...) \ 197 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 198 #define pr_cont(fmt, ...) \ 199 printk(KERN_CONT fmt, ##__VA_ARGS__) 200 201 /* pr_devel() should produce zero code unless DEBUG is defined */ 202 #ifdef DEBUG 203 #define pr_devel(fmt, ...) \ 204 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 205 #else 206 #define pr_devel(fmt, ...) \ 207 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 208 #endif 209 210 /* If you are writing a driver, please use dev_dbg instead */ 211 #if defined(CONFIG_DYNAMIC_DEBUG) 212 /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */ 213 #define pr_debug(fmt, ...) \ 214 dynamic_pr_debug(fmt, ##__VA_ARGS__) 215 #elif defined(DEBUG) 216 #define pr_debug(fmt, ...) \ 217 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 218 #else 219 #define pr_debug(fmt, ...) \ 220 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 221 #endif 222 223 /* 224 * Print a one-time message (analogous to WARN_ONCE() et al): 225 */ 226 227 #ifdef CONFIG_PRINTK 228 #define printk_once(fmt, ...) \ 229 ({ \ 230 static bool __print_once; \ 231 \ 232 if (!__print_once) { \ 233 __print_once = true; \ 234 printk(fmt, ##__VA_ARGS__); \ 235 } \ 236 }) 237 #else 238 #define printk_once(fmt, ...) \ 239 no_printk(fmt, ##__VA_ARGS__) 240 #endif 241 242 #define pr_emerg_once(fmt, ...) \ 243 printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 244 #define pr_alert_once(fmt, ...) \ 245 printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 246 #define pr_crit_once(fmt, ...) \ 247 printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 248 #define pr_err_once(fmt, ...) \ 249 printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 250 #define pr_warn_once(fmt, ...) \ 251 printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 252 #define pr_notice_once(fmt, ...) \ 253 printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 254 #define pr_info_once(fmt, ...) \ 255 printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 256 #define pr_cont_once(fmt, ...) \ 257 printk_once(KERN_CONT pr_fmt(fmt), ##__VA_ARGS__) 258 /* If you are writing a driver, please use dev_dbg instead */ 259 #if defined(DEBUG) 260 #define pr_debug_once(fmt, ...) \ 261 printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 262 #else 263 #define pr_debug_once(fmt, ...) \ 264 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 265 #endif 266 267 /* 268 * ratelimited messages with local ratelimit_state, 269 * no local ratelimit_state used in the !PRINTK case 270 */ 271 #ifdef CONFIG_PRINTK 272 #define printk_ratelimited(fmt, ...) \ 273 ({ \ 274 static DEFINE_RATELIMIT_STATE(_rs, \ 275 DEFAULT_RATELIMIT_INTERVAL, \ 276 DEFAULT_RATELIMIT_BURST); \ 277 \ 278 if (__ratelimit(&_rs)) \ 279 printk(fmt, ##__VA_ARGS__); \ 280 }) 281 #else 282 #define printk_ratelimited(fmt, ...) \ 283 no_printk(fmt, ##__VA_ARGS__) 284 #endif 285 286 #define pr_emerg_ratelimited(fmt, ...) \ 287 printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) 288 #define pr_alert_ratelimited(fmt, ...) \ 289 printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) 290 #define pr_crit_ratelimited(fmt, ...) \ 291 printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) 292 #define pr_err_ratelimited(fmt, ...) \ 293 printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 294 #define pr_warn_ratelimited(fmt, ...) \ 295 printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) 296 #define pr_notice_ratelimited(fmt, ...) \ 297 printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) 298 #define pr_info_ratelimited(fmt, ...) \ 299 printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 300 /* no pr_cont_ratelimited, don't do that... */ 301 /* If you are writing a driver, please use dev_dbg instead */ 302 #if defined(DEBUG) 303 #define pr_debug_ratelimited(fmt, ...) \ 304 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 305 #else 306 #define pr_debug_ratelimited(fmt, ...) \ 307 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 308 #endif 309 310 extern const struct file_operations kmsg_fops; 311 312 enum { 313 DUMP_PREFIX_NONE, 314 DUMP_PREFIX_ADDRESS, 315 DUMP_PREFIX_OFFSET 316 }; 317 extern void hex_dump_to_buffer(const void *buf, size_t len, 318 int rowsize, int groupsize, 319 char *linebuf, size_t linebuflen, bool ascii); 320 #ifdef CONFIG_PRINTK 321 extern void print_hex_dump(const char *level, const char *prefix_str, 322 int prefix_type, int rowsize, int groupsize, 323 const void *buf, size_t len, bool ascii); 324 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, 325 const void *buf, size_t len); 326 #else 327 static inline void print_hex_dump(const char *level, const char *prefix_str, 328 int prefix_type, int rowsize, int groupsize, 329 const void *buf, size_t len, bool ascii) 330 { 331 } 332 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type, 333 const void *buf, size_t len) 334 { 335 } 336 337 #endif 338 339 #endif 340