include/trace/perf.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #undef TRACE_SYSTEM_VAR
   4
   5 #ifdef CONFIG_PERF_EVENTS
   6
   7 #undef __entry
   8 #define __entry entry
   9
  10 #undef __get_dynamic_array
  11 #define __get_dynamic_array(field)      \
  12                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
  13
  14 #undef __get_dynamic_array_len
  15 #define __get_dynamic_array_len(field)  \
  16                 ((__entry->__data_loc_##field >> 16) & 0xffff)
  17
  18 #undef __get_str
  19 #define __get_str(field) ((char *)__get_dynamic_array(field))
  20
  21 #undef __get_bitmask
  22 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
  23
  24 #undef __perf_count
  25 #define __perf_count(c) (__count = (c))
  26
  27 #undef __perf_task
  28 #define __perf_task(t)  (__task = (t))
  29
  30 #undef DECLARE_EVENT_CLASS
  31 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
  32 static notrace void                                                     \
  33 perf_trace_##call(void *__data, proto)                                  \
  34 {                                                                       \
  35         struct trace_event_call *event_call = __data;                   \
  36         struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
  37         struct trace_event_raw_##call *entry;                           \
  38         struct bpf_prog *prog = event_call->prog;                       \
  39         struct pt_regs *__regs;                                         \
  40         u64 __count = 1;                                                \
  41         struct task_struct *__task = NULL;                              \
  42         struct hlist_head *head;                                        \
  43         int __entry_size;                                               \
  44         int __data_size;                                                \
  45         int rctx;                                                       \
  46                                                                         \
  47         __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
  48                                                                         \
  49         head = this_cpu_ptr(event_call->perf_events);                   \
  50         if (!prog && __builtin_constant_p(!__task) && !__task &&        \
  51                                 hlist_empty(head))                      \
  52                 return;                                                 \
  53                                                                         \
  54         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
  55                              sizeof(u64));                              \
  56         __entry_size -= sizeof(u32);                                    \
  57                                                                         \
  58         entry = perf_trace_buf_alloc(__entry_size, &__regs, &rctx);     \
  59         if (!entry)                                                     \
  60                 return;                                                 \
  61                                                                         \
  62         perf_fetch_caller_regs(__regs);                                 \
  63                                                                         \
  64         tstruct                                                         \
  65                                                                         \
  66         { assign; }                                                     \
  67                                                                         \
  68         perf_trace_run_bpf_submit(entry, __entry_size, rctx,            \
  69                                   event_call, __count, __regs,          \
  70                                   head, __task);                        \
  71 }
  72
  73 /*
  74  * This part is compiled out, it is only here as a build time check
  75  * to make sure that if the tracepoint handling changes, the
  76  * perf probe will fail to compile unless it too is updated.
  77  */
  78 #undef DEFINE_EVENT
  79 #define DEFINE_EVENT(template, call, proto, args)                       \
  80 static inline void perf_test_probe_##call(void)                         \
  81 {                                                                       \
  82         check_trace_callback_type_##call(perf_trace_##template);        \
  83 }
  84
  85
  86 #undef DEFINE_EVENT_PRINT
  87 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
  88         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  89
  90 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  91 #endif /* CONFIG_PERF_EVENTS */