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 __get_rel_dynamic_array
  25 #define __get_rel_dynamic_array(field)  \
  26                 ((void *)(&__entry->__rel_loc_##field) +        \
  27                  sizeof(__entry->__rel_loc_##field) +           \
  28                  (__entry->__rel_loc_##field & 0xffff))
  29
  30 #undef __get_rel_dynamic_array_len
  31 #define __get_rel_dynamic_array_len(field)      \
  32                 ((__entry->__rel_loc_##field >> 16) & 0xffff)
  33
  34 #undef __get_rel_str
  35 #define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field))
  36
  37 #undef __get_rel_bitmask
  38 #define __get_rel_bitmask(field) (char *)__get_rel_dynamic_array(field)
  39
  40 #undef __perf_count
  41 #define __perf_count(c) (__count = (c))
  42
  43 #undef __perf_task
  44 #define __perf_task(t)  (__task = (t))
  45
  46 #undef DECLARE_EVENT_CLASS
  47 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
  48 static notrace void                                                     \
  49 perf_trace_##call(void *__data, proto)                                  \
  50 {                                                                       \
  51         struct trace_event_call *event_call = __data;                   \
  52         struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
  53         struct trace_event_raw_##call *entry;                           \
  54         struct pt_regs *__regs;                                         \
  55         u64 __count = 1;                                                \
  56         struct task_struct *__task = NULL;                              \
  57         struct hlist_head *head;                                        \
  58         int __entry_size;                                               \
  59         int __data_size;                                                \
  60         int rctx;                                                       \
  61                                                                         \
  62         __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
  63                                                                         \
  64         head = this_cpu_ptr(event_call->perf_events);                   \
  65         if (!bpf_prog_array_valid(event_call) &&                        \
  66             __builtin_constant_p(!__task) && !__task &&                 \
  67             hlist_empty(head))                                          \
  68                 return;                                                 \
  69                                                                         \
  70         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
  71                              sizeof(u64));                              \
  72         __entry_size -= sizeof(u32);                                    \
  73                                                                         \
  74         entry = perf_trace_buf_alloc(__entry_size, &__regs, &rctx);     \
  75         if (!entry)                                                     \
  76                 return;                                                 \
  77                                                                         \
  78         perf_fetch_caller_regs(__regs);                                 \
  79                                                                         \
  80         tstruct                                                         \
  81                                                                         \
  82         { assign; }                                                     \
  83                                                                         \
  84         perf_trace_run_bpf_submit(entry, __entry_size, rctx,            \
  85                                   event_call, __count, __regs,          \
  86                                   head, __task);                        \
  87 }
  88
  89 /*
  90  * This part is compiled out, it is only here as a build time check
  91  * to make sure that if the tracepoint handling changes, the
  92  * perf probe will fail to compile unless it too is updated.
  93  */
  94 #undef DEFINE_EVENT
  95 #define DEFINE_EVENT(template, call, proto, args)                       \
  96 static inline void perf_test_probe_##call(void)                         \
  97 {                                                                       \
  98         check_trace_callback_type_##call(perf_trace_##template);        \
  99 }
 100
 101
 102 #undef DEFINE_EVENT_PRINT
 103 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 104         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 105
 106 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 107 #endif /* CONFIG_PERF_EVENTS */