instrumentation/events/lttng-module/printk.h

   1 #undef TRACE_SYSTEM
   2 #define TRACE_SYSTEM printk
   3
   4 #if !defined(_TRACE_PRINTK_H) || defined(TRACE_HEADER_MULTI_READ)
   5 #define _TRACE_PRINTK_H
   6
   7 #include <linux/tracepoint.h>
   8 #include <linux/version.h>
   9
  10 #define MSG_TRACE_MAX_LEN       2048
  11
  12 TRACE_EVENT_CONDITION(console,
  13         TP_PROTO(const char *log_buf, unsigned start, unsigned end,
  14                  unsigned log_buf_len),
  15
  16         TP_ARGS(log_buf, start, end, log_buf_len),
  17
  18         TP_CONDITION(start != end),
  19
  20         TP_STRUCT__entry(
  21                 __dynamic_array_text(char, msg,
  22                         min_t(unsigned, end - start, MSG_TRACE_MAX_LEN) + 1)
  23         ),
  24
  25         TP_fast_assign(
  26                 tp_memcpy_dyn(msg,
  27                         ({
  28                                 char lmsg[MSG_TRACE_MAX_LEN + 1];
  29
  30                                 if ((end - start) > MSG_TRACE_MAX_LEN)
  31                                         start = end - MSG_TRACE_MAX_LEN;
  32
  33 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,5,0))
  34                                 if ((start & (log_buf_len - 1)) >
  35                                         (end & (log_buf_len - 1))) {
  36                                         memcpy(lmsg,
  37                                                 log_buf +
  38                                                 (start & (log_buf_len - 1)),
  39                                                 log_buf_len -
  40                                                 (start & (log_buf_len - 1)));
  41                                         memcpy(lmsg + log_buf_len -
  42                                                 (start & (log_buf_len - 1)),
  43                                                 log_buf,
  44                                                 end & (log_buf_len - 1));
  45                                 } else
  46                                         memcpy(lmsg,
  47                                                 log_buf +
  48                                                 (start & (log_buf_len - 1)),
  49                                                 end - start);
  50 #else
  51                                 memcpy(lmsg, log_buf + start, end - start);
  52 #endif
  53                                 lmsg[end - start] = 0;
  54                                 lmsg;
  55                         })
  56                 )
  57         ),
  58
  59         TP_printk("%s", __get_str(msg))
  60 )
  61 #endif /* _TRACE_PRINTK_H */
  62
  63 /* This part must be outside protection */
  64 #include "../../../probes/define_trace.h"