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