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_count
  24 #define __perf_count(c) (__count = (c))
  25
  26 #undef __perf_task
  27 #define __perf_task(t)  (__task = (t))
  28
  29 #undef DECLARE_EVENT_CLASS
  30 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
  31 static notrace void                                                     \
  32 perf_trace_##call(void *__data, proto)                                  \
  33 {                                                                       \
  34         struct trace_event_call *event_call = __data;                   \
  35         struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
  36         struct trace_event_raw_##call *entry;                           \
  37         struct bpf_prog *prog = event_call->prog;                       \
  38         struct pt_regs *__regs;                                         \
  39         u64 __count = 1;                                                \
  40         struct task_struct *__task = NULL;                              \
  41         struct hlist_head *head;                                        \
  42         int __entry_size;                                               \
  43         int __data_size;                                                \
  44         int rctx;                                                       \
  45                                                                         \
  46         __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
  47                                                                         \
  48         head = this_cpu_ptr(event_call->perf_events);                   \
  49         if (!prog && __builtin_constant_p(!__task) && !__task &&        \
  50                                 hlist_empty(head))                      \
  51                 return;                                                 \
  52                                                                         \
  53         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
  54                              sizeof(u64));                              \
  55         __entry_size -= sizeof(u32);                                    \
  56                                                                         \
  57         entry = perf_trace_buf_alloc(__entry_size, &__regs, &rctx);     \
  58         if (!entry)                                                     \
  59                 return;                                                 \
  60                                                                         \
  61         perf_fetch_caller_regs(__regs);                                 \
  62                                                                         \
  63         tstruct                                                         \
  64                                                                         \
  65         { assign; }                                                     \
  66                                                                         \
  67         perf_trace_run_bpf_submit(entry, __entry_size, rctx,            \
  68                                   event_call, __count, __regs,          \
  69                                   head, __task);                        \
  70 }
  71
  72 /*
  73  * This part is compiled out, it is only here as a build time check
  74  * to make sure that if the tracepoint handling changes, the
  75  * perf probe will fail to compile unless it too is updated.
  76  */
  77 #undef DEFINE_EVENT
  78 #define DEFINE_EVENT(template, call, proto, args)                       \
  79 static inline void perf_test_probe_##call(void)                         \
  80 {                                                                       \
  81         check_trace_callback_type_##call(perf_trace_##template);        \
  82 }
  83
  84
  85 #undef DEFINE_EVENT_PRINT
  86 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
  87         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  88
  89 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  90 #endif /* CONFIG_PERF_EVENTS */