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   1 /*
   2  * Stage 2 of the trace events.
   3  *
   4  * Override the macros in <trace/trace_event_types.h> to include the following:
   5  *
   6  * enum print_line_t
   7  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
   8  * {
   9  *      struct trace_seq *s = &iter->seq;
  10  *      struct ftrace_raw_<call> *field; <-- defined in stage 1
  11  *      struct trace_entry *entry;
  12  *      int ret;
  13  *
  14  *      entry = iter->ent;
  15  *
  16  *      if (entry->type != event_<call>.id) {
  17  *              WARN_ON_ONCE(1);
  18  *              return TRACE_TYPE_UNHANDLED;
  19  *      }
  20  *
  21  *      field = (typeof(field))entry;
  22  *
  23  *      ret = trace_seq_printf(s, <TP_printk> "\n");
  24  *      if (!ret)
  25  *              return TRACE_TYPE_PARTIAL_LINE;
  26  *
  27  *      return TRACE_TYPE_HANDLED;
  28  * }
  29  *
  30  * This is the method used to print the raw event to the trace
  31  * output format. Note, this is not needed if the data is read
  32  * in binary.
  33  */
  34
  35 #undef __entry
  36 #define __entry field
  37
  38 #undef TP_printk
  39 #define TP_printk(fmt, args...) fmt "\n", args
  40
  41 #undef TRACE_EVENT
  42 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
  43 enum print_line_t                                                       \
  44 ftrace_raw_output_##call(struct trace_iterator *iter, int flags)        \
  45 {                                                                       \
  46         struct trace_seq *s = &iter->seq;                               \
  47         struct ftrace_raw_##call *field;                                \
  48         struct trace_entry *entry;                                      \
  49         int ret;                                                        \
  50                                                                         \
  51         entry = iter->ent;                                              \
  52                                                                         \
  53         if (entry->type != event_##call.id) {                           \
  54                 WARN_ON_ONCE(1);                                        \
  55                 return TRACE_TYPE_UNHANDLED;                            \
  56         }                                                               \
  57                                                                         \
  58         field = (typeof(field))entry;                                   \
  59                                                                         \
  60         ret = trace_seq_printf(s, #call ": " print);                    \
  61         if (!ret)                                                       \
  62                 return TRACE_TYPE_PARTIAL_LINE;                         \
  63                                                                         \
  64         return TRACE_TYPE_HANDLED;                                      \
  65 }
  66
  67 #include <trace/trace_event_types.h>
  68
  69 /*
  70  * Setup the showing format of trace point.
  71  *
  72  * int
  73  * ftrace_format_##call(struct trace_seq *s)
  74  * {
  75  *      struct ftrace_raw_##call field;
  76  *      int ret;
  77  *
  78  *      ret = trace_seq_printf(s, #type " " #item ";"
  79  *                             " offset:%u; size:%u;\n",
  80  *                             offsetof(struct ftrace_raw_##call, item),
  81  *                             sizeof(field.type));
  82  *
  83  * }
  84  */
  85
  86 #undef TP_STRUCT__entry
  87 #define TP_STRUCT__entry(args...) args
  88
  89 #undef __field
  90 #define __field(type, item)                                     \
  91         ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"      \
  92                                "offset:%u;\tsize:%u;\n",                \
  93                                (unsigned int)offsetof(typeof(field), item), \
  94                                (unsigned int)sizeof(field.item));       \
  95         if (!ret)                                                       \
  96                 return 0;
  97
  98 #undef __array
  99 #define __array(type, item, len)                                                \
 100         ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t"    \
 101                                "offset:%u;\tsize:%u;\n",                \
 102                                (unsigned int)offsetof(typeof(field), item), \
 103                                (unsigned int)sizeof(field.item));       \
 104         if (!ret)                                                       \
 105                 return 0;
 106
 107 #undef __entry
 108 #define __entry REC
 109
 110 #undef TP_printk
 111 #define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
 112
 113 #undef TP_fast_assign
 114 #define TP_fast_assign(args...) args
 115
 116 #undef TRACE_EVENT
 117 #define TRACE_EVENT(call, proto, args, tstruct, func, print)            \
 118 static int                                                              \
 119 ftrace_format_##call(struct trace_seq *s)                               \
 120 {                                                                       \
 121         struct ftrace_raw_##call field;                                 \
 122         int ret;                                                        \
 123                                                                         \
 124         tstruct;                                                        \
 125                                                                         \
 126         trace_seq_printf(s, "\nprint fmt: " print);                     \
 127                                                                         \
 128         return ret;                                                     \
 129 }
 130
 131 #include <trace/trace_event_types.h>
 132
 133 #undef __field
 134 #define __field(type, item)                                             \
 135         ret = trace_define_field(event_call, #type, #item,              \
 136                                  offsetof(typeof(field), item),         \
 137                                  sizeof(field.item));                   \
 138         if (ret)                                                        \
 139                 return ret;
 140
 141 #undef __array
 142 #define __array(type, item, len)                                        \
 143         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
 144                                  offsetof(typeof(field), item),         \
 145                                  sizeof(field.item));                   \
 146         if (ret)                                                        \
 147                 return ret;
 148
 149 #undef TRACE_EVENT
 150 #define TRACE_EVENT(call, proto, args, tstruct, func, print)            \
 151 int                                                                     \
 152 ftrace_define_fields_##call(void)                                       \
 153 {                                                                       \
 154         struct ftrace_raw_##call field;                                 \
 155         struct ftrace_event_call *event_call = &event_##call;           \
 156         int ret;                                                        \
 157                                                                         \
 158         __common_field(unsigned char, type);                            \
 159         __common_field(unsigned char, flags);                           \
 160         __common_field(unsigned char, preempt_count);                   \
 161         __common_field(int, pid);                                       \
 162         __common_field(int, tgid);                                      \
 163                                                                         \
 164         tstruct;                                                        \
 165                                                                         \
 166         return ret;                                                     \
 167 }
 168
 169 #include <trace/trace_event_types.h>