include/trace/perf.h

   1
   2 #undef TRACE_SYSTEM_VAR
   3
   4 #ifdef CONFIG_PERF_EVENTS
   5
   6 #undef __entry
   7 #define __entry entry
   8
   9 #undef __get_dynamic_array
  10 #define __get_dynamic_array(field)      \
  11                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
  12
  13 #undef __get_dynamic_array_len
  14 #define __get_dynamic_array_len(field)  \
  15                 ((__entry->__data_loc_##field >> 16) & 0xffff)
  16
  17 #undef __get_str
  18 #define __get_str(field) (char *)__get_dynamic_array(field)
  19
  20 #undef __get_bitmask
  21 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
  22
  23 #undef __perf_addr
  24 #define __perf_addr(a)  (__addr = (a))
  25
  26 #undef __perf_count
  27 #define __perf_count(c) (__count = (c))
  28
  29 #undef __perf_task
  30 #define __perf_task(t)  (__task = (t))
  31
  32 #undef DECLARE_EVENT_CLASS
  33 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
  34 static notrace void                                                     \
  35 perf_trace_##call(void *__data, proto)                                  \
  36 {                                                                       \
  37         struct trace_event_call *event_call = __data;                   \
  38         struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
  39         struct trace_event_raw_##call *entry;                           \
  40         struct pt_regs *__regs;                                         \
  41         u64 __addr = 0, __count = 1;                                    \
  42         struct task_struct *__task = NULL;                              \
  43         struct hlist_head *head;                                        \
  44         int __entry_size;                                               \
  45         int __data_size;                                                \
  46         int rctx;                                                       \
  47                                                                         \
  48         __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
  49                                                                         \
  50         head = this_cpu_ptr(event_call->perf_events);                   \
  51         if (__builtin_constant_p(!__task) && !__task &&                 \
  52                                 hlist_empty(head))                      \
  53                 return;                                                 \
  54                                                                         \
  55         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
  56                              sizeof(u64));                              \
  57         __entry_size -= sizeof(u32);                                    \
  58                                                                         \
  59         entry = perf_trace_buf_prepare(__entry_size,                    \
  60                         event_call->event.type, &__regs, &rctx);        \
  61         if (!entry)                                                     \
  62                 return;                                                 \
  63                                                                         \
  64         perf_fetch_caller_regs(__regs);                                 \
  65                                                                         \
  66         tstruct                                                         \
  67                                                                         \
  68         { assign; }                                                     \
  69                                                                         \
  70         perf_trace_buf_submit(entry, __entry_size, rctx, __addr,        \
  71                 __count, __regs, head, __task);                         \
  72 }
  73
  74 /*
  75  * This part is compiled out, it is only here as a build time check
  76  * to make sure that if the tracepoint handling changes, the
  77  * perf probe will fail to compile unless it too is updated.
  78  */
  79 #undef DEFINE_EVENT
  80 #define DEFINE_EVENT(template, call, proto, args)                       \
  81 static inline void perf_test_probe_##call(void)                         \
  82 {                                                                       \
  83         check_trace_callback_type_##call(perf_trace_##template);        \
  84 }
  85
  86
  87 #undef DEFINE_EVENT_PRINT
  88 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
  89         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  90
  91 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  92 #endif /* CONFIG_PERF_EVENTS */