include/linux/printk.h

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