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 #include "stages/stage6_event_callback.h"
   8
   9 #undef __perf_count
  10 #define __perf_count(c) (__count = (c))
  11
  12 #undef __perf_task
  13 #define __perf_task(t)  (__task = (t))
  14
  15 #undef __DECLARE_EVENT_CLASS
  16 #define __DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
  17 static notrace void                                                     \
  18 do_perf_trace_##call(void *__data, proto)                               \
  19 {                                                                       \
  20         struct trace_event_call *event_call = __data;                   \
  21         struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
  22         struct trace_event_raw_##call *entry;                           \
  23         struct pt_regs *__regs;                                         \
  24         u64 __count = 1;                                                \
  25         struct task_struct *__task = NULL;                              \
  26         struct hlist_head *head;                                        \
  27         int __entry_size;                                               \
  28         int __data_size;                                                \
  29         int rctx;                                                       \
  30                                                                         \
  31         __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
  32                                                                         \
  33         head = this_cpu_ptr(event_call->perf_events);                   \
  34         if (!bpf_prog_array_valid(event_call) &&                        \
  35             __builtin_constant_p(!__task) && !__task &&                 \
  36             hlist_empty(head))                                          \
  37                 return;                                                 \
  38                                                                         \
  39         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
  40                              sizeof(u64));                              \
  41         __entry_size -= sizeof(u32);                                    \
  42                                                                         \
  43         entry = perf_trace_buf_alloc(__entry_size, &__regs, &rctx);     \
  44         if (!entry)                                                     \
  45                 return;                                                 \
  46                                                                         \
  47         perf_fetch_caller_regs(__regs);                                 \
  48                                                                         \
  49         tstruct                                                         \
  50                                                                         \
  51         { assign; }                                                     \
  52                                                                         \
  53         perf_trace_run_bpf_submit(entry, __entry_size, rctx,            \
  54                                   event_call, __count, __regs,          \
  55                                   head, __task);                        \
  56 }
  57
  58 /*
  59  * Define unused __count and __task variables to use @args to pass
  60  * arguments to do_perf_trace_##call. This is needed because the
  61  * macros __perf_count and __perf_task introduce the side-effect to
  62  * store copies into those local variables.
  63  */
  64 #undef DECLARE_EVENT_CLASS
  65 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
  66 __DECLARE_EVENT_CLASS(call, PARAMS(proto), PARAMS(args), PARAMS(tstruct), \
  67                       PARAMS(assign), PARAMS(print))                    \
  68 static notrace void                                                     \
  69 perf_trace_##call(void *__data, proto)                                  \
  70 {                                                                       \
  71         u64 __count __attribute__((unused));                            \
  72         struct task_struct *__task __attribute__((unused));             \
  73                                                                         \
  74         do_perf_trace_##call(__data, args);                             \
  75 }
  76
  77 #undef DECLARE_EVENT_SYSCALL_CLASS
  78 #define DECLARE_EVENT_SYSCALL_CLASS(call, proto, args, tstruct, assign, print) \
  79 __DECLARE_EVENT_CLASS(call, PARAMS(proto), PARAMS(args), PARAMS(tstruct), \
  80                       PARAMS(assign), PARAMS(print))                    \
  81 static notrace void                                                     \
  82 perf_trace_##call(void *__data, proto)                                  \
  83 {                                                                       \
  84         u64 __count __attribute__((unused));                            \
  85         struct task_struct *__task __attribute__((unused));             \
  86                                                                         \
  87         might_fault();                                                  \
  88         preempt_disable_notrace();                                      \
  89         do_perf_trace_##call(__data, args);                             \
  90         preempt_enable_notrace();                                       \
  91 }
  92
  93 /*
  94  * This part is compiled out, it is only here as a build time check
  95  * to make sure that if the tracepoint handling changes, the
  96  * perf probe will fail to compile unless it too is updated.
  97  */
  98 #undef DEFINE_EVENT
  99 #define DEFINE_EVENT(template, call, proto, args)                       \
 100 static inline void perf_test_probe_##call(void)                         \
 101 {                                                                       \
 102         check_trace_callback_type_##call(perf_trace_##template);        \
 103 }
 104
 105
 106 #undef DEFINE_EVENT_PRINT
 107 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 108         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 109
 110 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 111
 112 #undef __DECLARE_EVENT_CLASS
 113
 114 #endif /* CONFIG_PERF_EVENTS */