instrumentation/events/lttng-module/printk.h

   1 #undef TRACE_SYSTEM
   2 #define TRACE_SYSTEM printk
   3
   4 #if !defined(LTTNG_TRACE_PRINTK_H) || defined(TRACE_HEADER_MULTI_READ)
   5 #define LTTNG_TRACE_PRINTK_H
   6
   7 #include <probes/lttng-tracepoint-event.h>
   8 #include <linux/version.h>
   9
  10 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0))
  11
  12 LTTNG_TRACEPOINT_EVENT_MAP(console,
  13
  14         printk_console,
  15
  16         TP_PROTO(const char *text, size_t len),
  17
  18         TP_ARGS(text, len),
  19
  20         TP_FIELDS(
  21                 ctf_sequence_text(char, msg, text, size_t, len)
  22         )
  23 )
  24
  25 #elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0))
  26
  27 LTTNG_TRACEPOINT_EVENT_MAP(console,
  28
  29         printk_console,
  30
  31         TP_PROTO(const char *log_buf, unsigned start, unsigned end,
  32                  unsigned log_buf_len),
  33
  34         TP_ARGS(log_buf, start, end, log_buf_len),
  35
  36         TP_FIELDS(
  37                 ctf_sequence_text(char, msg, log_buf + start,
  38                         size_t, end - start)
  39         )
  40 )
  41
  42 #else /* (LINUX_VERSION_CODE < KERNEL_VERSION(3,5,0)) */
  43
  44 LTTNG_TRACEPOINT_EVENT_MAP(console,
  45
  46         printk_console,
  47
  48         TP_PROTO(const char *log_buf, unsigned start, unsigned end,
  49                  unsigned log_buf_len),
  50
  51         TP_ARGS(log_buf, start, end, log_buf_len),
  52
  53         TP_FIELDS(
  54                 /*
  55                  * printk buffer is gathered from two segments on older kernels.
  56                  */
  57                 ctf_sequence_text(char, msg1,
  58                         log_buf + (start & (log_buf_len - 1)),
  59                         size_t, (start & (log_buf_len - 1)) > (end & (log_buf_len - 1))
  60                                 ? log_buf_len - (start & (log_buf_len - 1))
  61                                 : end - start)
  62                 ctf_sequence_text(char, msg2,
  63                         log_buf,
  64                         size_t, (start & (log_buf_len - 1)) > (end & (log_buf_len - 1))
  65                                 ? end & (log_buf_len - 1)
  66                                 : 0)
  67         )
  68 )
  69
  70 #endif
  71
  72 #endif /* LTTNG_TRACE_PRINTK_H */
  73
  74 /* This part must be outside protection */
  75 #include <probes/define_trace.h>