include/instrumentation/events/printk.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 #undef TRACE_SYSTEM
   3 #define TRACE_SYSTEM printk
   4
   5 #if !defined(LTTNG_TRACE_PRINTK_H) || defined(TRACE_HEADER_MULTI_READ)
   6 #define LTTNG_TRACE_PRINTK_H
   7
   8 #include <lttng/tracepoint-event.h>
   9 #include <linux/version.h>
  10
  11 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0))
  12
  13 LTTNG_TRACEPOINT_EVENT_MAP(console,
  14
  15         printk_console,
  16
  17         TP_PROTO(const char *text, size_t len),
  18
  19         TP_ARGS(text, len),
  20
  21         TP_FIELDS(
  22                 ctf_sequence_text(char, msg, text, size_t, len)
  23         )
  24 )
  25
  26 #elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0))
  27
  28 LTTNG_TRACEPOINT_EVENT_MAP(console,
  29
  30         printk_console,
  31
  32         TP_PROTO(const char *log_buf, unsigned start, unsigned end,
  33                  unsigned log_buf_len),
  34
  35         TP_ARGS(log_buf, start, end, log_buf_len),
  36
  37         TP_FIELDS(
  38                 ctf_sequence_text(char, msg, log_buf + start,
  39                         size_t, end - start)
  40         )
  41 )
  42
  43 #else /* (LINUX_VERSION_CODE < KERNEL_VERSION(3,5,0)) */
  44
  45 LTTNG_TRACEPOINT_EVENT_MAP(console,
  46
  47         printk_console,
  48
  49         TP_PROTO(const char *log_buf, unsigned start, unsigned end,
  50                  unsigned log_buf_len),
  51
  52         TP_ARGS(log_buf, start, end, log_buf_len),
  53
  54         TP_FIELDS(
  55                 /*
  56                  * printk buffer is gathered from two segments on older kernels.
  57                  */
  58                 ctf_sequence_text(char, msg1,
  59                         log_buf + (start & (log_buf_len - 1)),
  60                         size_t, (start & (log_buf_len - 1)) > (end & (log_buf_len - 1))
  61                                 ? log_buf_len - (start & (log_buf_len - 1))
  62                                 : end - start)
  63                 ctf_sequence_text(char, msg2,
  64                         log_buf,
  65                         size_t, (start & (log_buf_len - 1)) > (end & (log_buf_len - 1))
  66                                 ? end & (log_buf_len - 1)
  67                                 : 0)
  68         )
  69 )
  70
  71 #endif
  72
  73 #endif /* LTTNG_TRACE_PRINTK_H */
  74
  75 /* This part must be outside protection */
  76 #include <lttng/define_trace.h>