LXR linux/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)  \
  32static notrace void                                                     \
  33perf_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 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 (!bpf_prog_array_valid(event_call) &&                        \
  50            __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)                       \
  80static 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 */
  92