include/linux/printk.h

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