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include/trace/perf.h 2.57 KB
b24413180   Greg Kroah-Hartman   License cleanup: ...
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  /* SPDX-License-Identifier: GPL-2.0 */
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  #undef TRACE_SYSTEM_VAR
  
  #ifdef CONFIG_PERF_EVENTS
  
  #undef __entry
  #define __entry entry
  
  #undef __get_dynamic_array
  #define __get_dynamic_array(field)	\
  		((void *)__entry + (__entry->__data_loc_##field & 0xffff))
  
  #undef __get_dynamic_array_len
  #define __get_dynamic_array_len(field)	\
  		((__entry->__data_loc_##field >> 16) & 0xffff)
  
  #undef __get_str
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  #define __get_str(field) ((char *)__get_dynamic_array(field))
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  #undef __get_bitmask
  #define __get_bitmask(field) (char *)__get_dynamic_array(field)
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  #undef __perf_count
  #define __perf_count(c)	(__count = (c))
  
  #undef __perf_task
  #define __perf_task(t)	(__task = (t))
  
  #undef DECLARE_EVENT_CLASS
  #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
  static notrace void							\
  perf_trace_##call(void *__data, proto)					\
  {									\
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  	struct trace_event_call *event_call = __data;			\
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  	struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
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  	struct trace_event_raw_##call *entry;				\
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  	struct pt_regs *__regs;						\
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  	u64 __count = 1;						\
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  	struct task_struct *__task = NULL;				\
  	struct hlist_head *head;					\
  	int __entry_size;						\
  	int __data_size;						\
  	int rctx;							\
  									\
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  	__data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
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  									\
  	head = this_cpu_ptr(event_call->perf_events);			\
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  	if (!bpf_prog_array_valid(event_call) &&			\
  	    __builtin_constant_p(!__task) && !__task &&			\
  	    hlist_empty(head))						\
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  		return;							\
  									\
  	__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
  			     sizeof(u64));				\
  	__entry_size -= sizeof(u32);					\
  									\
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  	entry = perf_trace_buf_alloc(__entry_size, &__regs, &rctx);	\
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  	if (!entry)							\
  		return;							\
  									\
  	perf_fetch_caller_regs(__regs);					\
  									\
  	tstruct								\
  									\
  	{ assign; }							\
  									\
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  	perf_trace_run_bpf_submit(entry, __entry_size, rctx,		\
  				  event_call, __count, __regs,		\
  				  head, __task);			\
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  }
  
  /*
   * This part is compiled out, it is only here as a build time check
   * to make sure that if the tracepoint handling changes, the
   * perf probe will fail to compile unless it too is updated.
   */
  #undef DEFINE_EVENT
  #define DEFINE_EVENT(template, call, proto, args)			\
  static inline void perf_test_probe_##call(void)				\
  {									\
  	check_trace_callback_type_##call(perf_trace_##template);	\
  }
  
  
  #undef DEFINE_EVENT_PRINT
  #define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
  	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  
  #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  #endif /* CONFIG_PERF_EVENTS */