470 lines
14 KiB
C
470 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Stage 1 of the trace events.
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*
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* Override the macros in the event tracepoint header <trace/events/XXX.h>
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* to include the following:
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*
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* struct trace_event_raw_<call> {
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* struct trace_entry ent;
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* <type> <item>;
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* <type2> <item2>[<len>];
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* [...]
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* };
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*
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* The <type> <item> is created by the __field(type, item) macro or
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* the __array(type2, item2, len) macro.
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* We simply do "type item;", and that will create the fields
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* in the structure.
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*/
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#include <linux/trace_events.h>
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#ifndef TRACE_SYSTEM_VAR
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#define TRACE_SYSTEM_VAR TRACE_SYSTEM
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#endif
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#include "stages/init.h"
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/*
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* DECLARE_EVENT_CLASS can be used to add a generic function
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* handlers for events. That is, if all events have the same
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* parameters and just have distinct trace points.
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* Each tracepoint can be defined with DEFINE_EVENT and that
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* will map the DECLARE_EVENT_CLASS to the tracepoint.
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*
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* TRACE_EVENT is a one to one mapping between tracepoint and template.
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*/
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#undef TRACE_EVENT
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#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
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DECLARE_EVENT_CLASS(name, \
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PARAMS(proto), \
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PARAMS(args), \
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PARAMS(tstruct), \
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PARAMS(assign), \
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PARAMS(print)); \
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DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
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#include "stages/stage1_struct_define.h"
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#undef DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
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struct trace_event_raw_##name { \
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struct trace_entry ent; \
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tstruct \
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char __data[]; \
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}; \
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\
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static struct trace_event_class event_class_##name;
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#undef DEFINE_EVENT
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#define DEFINE_EVENT(template, name, proto, args) \
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static struct trace_event_call __used \
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__attribute__((__aligned__(4))) event_##name
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#undef DEFINE_EVENT_FN
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#define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg) \
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DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
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#undef DEFINE_EVENT_PRINT
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#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
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DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
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/* Callbacks are meaningless to ftrace. */
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#undef TRACE_EVENT_FN
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#define TRACE_EVENT_FN(name, proto, args, tstruct, \
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assign, print, reg, unreg) \
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TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
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PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
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#undef TRACE_EVENT_FN_COND
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#define TRACE_EVENT_FN_COND(name, proto, args, cond, tstruct, \
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assign, print, reg, unreg) \
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TRACE_EVENT_CONDITION(name, PARAMS(proto), PARAMS(args), PARAMS(cond), \
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PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
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#undef TRACE_EVENT_FLAGS
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#define TRACE_EVENT_FLAGS(name, value) \
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__TRACE_EVENT_FLAGS(name, value)
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#undef TRACE_EVENT_PERF_PERM
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#define TRACE_EVENT_PERF_PERM(name, expr...) \
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__TRACE_EVENT_PERF_PERM(name, expr)
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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/*
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* Stage 2 of the trace events.
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*
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* Include the following:
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*
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* struct trace_event_data_offsets_<call> {
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* u32 <item1>;
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* u32 <item2>;
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* [...]
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* };
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*
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* The __dynamic_array() macro will create each u32 <item>, this is
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* to keep the offset of each array from the beginning of the event.
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* The size of an array is also encoded, in the higher 16 bits of <item>.
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*/
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#include "stages/stage2_data_offsets.h"
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#undef DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
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struct trace_event_data_offsets_##call { \
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tstruct; \
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};
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#undef DEFINE_EVENT
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#define DEFINE_EVENT(template, name, proto, args)
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#undef DEFINE_EVENT_PRINT
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#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
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#undef TRACE_EVENT_FLAGS
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#define TRACE_EVENT_FLAGS(event, flag)
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#undef TRACE_EVENT_PERF_PERM
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#define TRACE_EVENT_PERF_PERM(event, expr...)
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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/*
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* Stage 3 of the trace events.
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*
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* Override the macros in the event tracepoint header <trace/events/XXX.h>
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* to include the following:
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*
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* enum print_line_t
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* trace_raw_output_<call>(struct trace_iterator *iter, int flags)
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* {
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* struct trace_seq *s = &iter->seq;
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* struct trace_event_raw_<call> *field; <-- defined in stage 1
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* struct trace_seq *p = &iter->tmp_seq;
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*
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* -------(for event)-------
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*
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* struct trace_entry *entry;
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*
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* entry = iter->ent;
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*
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* if (entry->type != event_<call>->event.type) {
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* WARN_ON_ONCE(1);
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* return TRACE_TYPE_UNHANDLED;
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* }
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*
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* field = (typeof(field))entry;
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*
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* trace_seq_init(p);
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* return trace_output_call(iter, <call>, <TP_printk> "\n");
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*
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* ------(or, for event class)------
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*
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* int ret;
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*
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* field = (typeof(field))iter->ent;
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*
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* ret = trace_raw_output_prep(iter, trace_event);
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* if (ret != TRACE_TYPE_HANDLED)
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* return ret;
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*
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* trace_event_printf(iter, <TP_printk> "\n");
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*
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* return trace_handle_return(s);
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* -------
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* }
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*
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* This is the method used to print the raw event to the trace
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* output format. Note, this is not needed if the data is read
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* in binary.
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*/
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#include "stages/stage3_trace_output.h"
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#undef DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
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static notrace enum print_line_t \
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trace_raw_output_##call(struct trace_iterator *iter, int flags, \
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struct trace_event *trace_event) \
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{ \
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struct trace_seq *s = &iter->seq; \
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struct trace_seq __maybe_unused *p = &iter->tmp_seq; \
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struct trace_event_raw_##call *field; \
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int ret; \
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\
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field = (typeof(field))iter->ent; \
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\
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ret = trace_raw_output_prep(iter, trace_event); \
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if (ret != TRACE_TYPE_HANDLED) \
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return ret; \
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\
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trace_event_printf(iter, print); \
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\
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return trace_handle_return(s); \
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} \
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static struct trace_event_functions trace_event_type_funcs_##call = { \
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.trace = trace_raw_output_##call, \
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};
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#undef DEFINE_EVENT_PRINT
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#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
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static notrace enum print_line_t \
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trace_raw_output_##call(struct trace_iterator *iter, int flags, \
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struct trace_event *event) \
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{ \
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struct trace_event_raw_##template *field; \
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struct trace_entry *entry; \
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struct trace_seq *p = &iter->tmp_seq; \
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\
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entry = iter->ent; \
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\
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if (entry->type != event_##call.event.type) { \
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WARN_ON_ONCE(1); \
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return TRACE_TYPE_UNHANDLED; \
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} \
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\
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field = (typeof(field))entry; \
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\
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trace_seq_init(p); \
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return trace_output_call(iter, #call, print); \
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} \
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static struct trace_event_functions trace_event_type_funcs_##call = { \
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.trace = trace_raw_output_##call, \
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};
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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#include "stages/stage4_event_fields.h"
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#undef DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
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static struct trace_event_fields trace_event_fields_##call[] = { \
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tstruct \
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{} };
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#undef DEFINE_EVENT_PRINT
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#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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#include "stages/stage5_get_offsets.h"
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#undef DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
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static inline notrace int trace_event_get_offsets_##call( \
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struct trace_event_data_offsets_##call *__data_offsets, proto) \
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{ \
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int __data_size = 0; \
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int __maybe_unused __item_length; \
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struct trace_event_raw_##call __maybe_unused *entry; \
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\
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tstruct; \
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\
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return __data_size; \
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}
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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/*
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* Stage 4 of the trace events.
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*
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* Override the macros in the event tracepoint header <trace/events/XXX.h>
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* to include the following:
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*
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* For those macros defined with TRACE_EVENT:
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*
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* static struct trace_event_call event_<call>;
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*
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* static void trace_event_raw_event_<call>(void *__data, proto)
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* {
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* struct trace_event_file *trace_file = __data;
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* struct trace_event_call *event_call = trace_file->event_call;
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* struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
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* unsigned long eflags = trace_file->flags;
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* enum event_trigger_type __tt = ETT_NONE;
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* struct ring_buffer_event *event;
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* struct trace_event_raw_<call> *entry; <-- defined in stage 1
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* struct trace_buffer *buffer;
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* unsigned long irq_flags;
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* int __data_size;
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* int pc;
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*
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* if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
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* if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
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* event_triggers_call(trace_file, NULL);
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* if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
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* return;
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* }
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*
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* local_save_flags(irq_flags);
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* pc = preempt_count();
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*
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* __data_size = trace_event_get_offsets_<call>(&__data_offsets, args);
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*
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* event = trace_event_buffer_lock_reserve(&buffer, trace_file,
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* event_<call>->event.type,
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* sizeof(*entry) + __data_size,
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* irq_flags, pc);
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* if (!event)
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* return;
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* entry = ring_buffer_event_data(event);
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*
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* { <assign>; } <-- Here we assign the entries by the __field and
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* __array macros.
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*
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* if (eflags & EVENT_FILE_FL_TRIGGER_COND)
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* __tt = event_triggers_call(trace_file, entry);
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*
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* if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT,
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* &trace_file->flags))
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* ring_buffer_discard_commit(buffer, event);
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* else if (!filter_check_discard(trace_file, entry, buffer, event))
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* trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
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*
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* if (__tt)
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* event_triggers_post_call(trace_file, __tt);
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* }
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*
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* static struct trace_event ftrace_event_type_<call> = {
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* .trace = trace_raw_output_<call>, <-- stage 2
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* };
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*
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* static char print_fmt_<call>[] = <TP_printk>;
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*
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* static struct trace_event_class __used event_class_<template> = {
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* .system = "<system>",
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* .fields_array = trace_event_fields_<call>,
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* .fields = LIST_HEAD_INIT(event_class_##call.fields),
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* .raw_init = trace_event_raw_init,
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* .probe = trace_event_raw_event_##call,
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* .reg = trace_event_reg,
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* };
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*
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* static struct trace_event_call event_<call> = {
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* .class = event_class_<template>,
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* {
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* .tp = &__tracepoint_<call>,
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* },
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* .event = &ftrace_event_type_<call>,
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* .print_fmt = print_fmt_<call>,
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* .flags = TRACE_EVENT_FL_TRACEPOINT,
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* };
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* // its only safe to use pointers when doing linker tricks to
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* // create an array.
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* static struct trace_event_call __used
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* __section("_ftrace_events") *__event_<call> = &event_<call>;
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*
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*/
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#ifdef CONFIG_PERF_EVENTS
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#define _TRACE_PERF_PROTO(call, proto) \
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static notrace void \
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perf_trace_##call(void *__data, proto);
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#define _TRACE_PERF_INIT(call) \
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.perf_probe = perf_trace_##call,
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#else
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#define _TRACE_PERF_PROTO(call, proto)
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#define _TRACE_PERF_INIT(call)
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#endif /* CONFIG_PERF_EVENTS */
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#include "stages/stage6_event_callback.h"
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#undef DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
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\
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static notrace void \
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trace_event_raw_event_##call(void *__data, proto) \
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{ \
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struct trace_event_file *trace_file = __data; \
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struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
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struct trace_event_buffer fbuffer; \
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struct trace_event_raw_##call *entry; \
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int __data_size; \
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\
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if (trace_trigger_soft_disabled(trace_file)) \
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return; \
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\
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__data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
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\
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entry = trace_event_buffer_reserve(&fbuffer, trace_file, \
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sizeof(*entry) + __data_size); \
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\
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if (!entry) \
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return; \
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\
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tstruct \
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\
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{ assign; } \
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\
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trace_event_buffer_commit(&fbuffer); \
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}
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/*
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* The ftrace_test_probe is compiled out, it is only here as a build time check
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* to make sure that if the tracepoint handling changes, the ftrace probe will
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* fail to compile unless it too is updated.
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*/
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#undef DEFINE_EVENT
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#define DEFINE_EVENT(template, call, proto, args) \
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static inline void ftrace_test_probe_##call(void) \
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{ \
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check_trace_callback_type_##call(trace_event_raw_event_##template); \
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}
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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#include "stages/stage7_class_define.h"
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#undef DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
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_TRACE_PERF_PROTO(call, PARAMS(proto)); \
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static char print_fmt_##call[] = print; \
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static struct trace_event_class __used __refdata event_class_##call = { \
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.system = TRACE_SYSTEM_STRING, \
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.fields_array = trace_event_fields_##call, \
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.fields = LIST_HEAD_INIT(event_class_##call.fields),\
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.raw_init = trace_event_raw_init, \
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.probe = trace_event_raw_event_##call, \
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.reg = trace_event_reg, \
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_TRACE_PERF_INIT(call) \
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};
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#undef DEFINE_EVENT
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#define DEFINE_EVENT(template, call, proto, args) \
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\
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static struct trace_event_call __used event_##call = { \
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.class = &event_class_##template, \
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{ \
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.tp = &__tracepoint_##call, \
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}, \
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.event.funcs = &trace_event_type_funcs_##template, \
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.print_fmt = print_fmt_##template, \
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.flags = TRACE_EVENT_FL_TRACEPOINT, \
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}; \
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static struct trace_event_call __used \
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__section("_ftrace_events") *__event_##call = &event_##call
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#undef DEFINE_EVENT_PRINT
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#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
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\
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static char print_fmt_##call[] = print; \
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\
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static struct trace_event_call __used event_##call = { \
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.class = &event_class_##template, \
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{ \
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.tp = &__tracepoint_##call, \
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}, \
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.event.funcs = &trace_event_type_funcs_##call, \
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.print_fmt = print_fmt_##call, \
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.flags = TRACE_EVENT_FL_TRACEPOINT, \
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}; \
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static struct trace_event_call __used \
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__section("_ftrace_events") *__event_##call = &event_##call
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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