f2aebaee65
"call" is an argument of macro, but it is also used as a local variable name of function in macro. We should keep this local variable name distinct from any CPP macro parameter name if both are in the same macro scope, although it hasn't caused any problem yet. [ Impact: robustify macro ] Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
532 lines
14 KiB
C
532 lines
14 KiB
C
/*
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* Stage 1 of the trace events.
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*
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* Override the macros in <trace/trace_events.h> to include the following:
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*
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* struct ftrace_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/ftrace_event.h>
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#undef __array
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#define __array(type, item, len) type item[len];
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#undef __field
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#define __field(type, item) type item;
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#undef __string
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#define __string(item, src) unsigned short __str_loc_##item;
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#undef TP_STRUCT__entry
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#define TP_STRUCT__entry(args...) args
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#undef TRACE_EVENT
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#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
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struct ftrace_raw_##name { \
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struct trace_entry ent; \
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tstruct \
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char __str_data[0]; \
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}; \
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static struct ftrace_event_call event_##name
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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 ftrace_str_offsets_<call> {
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* int <str1>;
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* int <str2>;
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* [...]
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* };
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*
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* The __string() macro will create each int <str>, this is to
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* keep the offset of each string from the beggining of the event
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* once we perform the strlen() of the src strings.
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*
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*/
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#undef __array
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#define __array(type, item, len)
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#undef __field
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#define __field(type, item);
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#undef __string
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#define __string(item, src) int item;
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#undef TRACE_EVENT
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#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
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struct ftrace_str_offsets_##call { \
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tstruct; \
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};
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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 <trace/trace_events.h> to include the following:
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*
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* enum print_line_t
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* ftrace_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 ftrace_raw_<call> *field; <-- defined in stage 1
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* struct trace_entry *entry;
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* struct trace_seq *p;
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* int ret;
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*
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* entry = iter->ent;
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*
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* if (entry->type != event_<call>.id) {
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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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* p = get_cpu_var(ftrace_event_seq);
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* ret = trace_seq_printf(s, <TP_printk> "\n");
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* put_cpu();
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* if (!ret)
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* return TRACE_TYPE_PARTIAL_LINE;
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*
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* return TRACE_TYPE_HANDLED;
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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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#undef __entry
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#define __entry field
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#undef TP_printk
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#define TP_printk(fmt, args...) fmt "\n", args
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#undef __get_str
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#define __get_str(field) ((char *)__entry + __entry->__str_loc_##field)
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#undef __print_flags
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#define __print_flags(flag, delim, flag_array...) \
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({ \
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static const struct trace_print_flags flags[] = \
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{ flag_array, { -1, NULL }}; \
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ftrace_print_flags_seq(p, delim, flag, flags); \
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})
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#undef __print_symbolic
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#define __print_symbolic(value, symbol_array...) \
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({ \
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static const struct trace_print_flags symbols[] = \
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{ symbol_array, { -1, NULL }}; \
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ftrace_print_symbols_seq(p, value, symbols); \
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})
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#undef TRACE_EVENT
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#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
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enum print_line_t \
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ftrace_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 ftrace_raw_##call *field; \
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struct trace_entry *entry; \
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struct trace_seq *p; \
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int ret; \
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\
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entry = iter->ent; \
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\
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if (entry->type != event_##call.id) { \
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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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p = &get_cpu_var(ftrace_event_seq); \
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ret = trace_seq_printf(s, #call ": " print); \
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put_cpu(); \
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if (!ret) \
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return TRACE_TYPE_PARTIAL_LINE; \
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\
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return TRACE_TYPE_HANDLED; \
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}
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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/*
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* Setup the showing format of trace point.
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*
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* int
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* ftrace_format_##call(struct trace_seq *s)
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* {
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* struct ftrace_raw_##call field;
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* int ret;
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*
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* ret = trace_seq_printf(s, #type " " #item ";"
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* " offset:%u; size:%u;\n",
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* offsetof(struct ftrace_raw_##call, item),
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* sizeof(field.type));
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*
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* }
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*/
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#undef TP_STRUCT__entry
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#define TP_STRUCT__entry(args...) args
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#undef __field
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#define __field(type, item) \
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ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \
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"offset:%u;\tsize:%u;\n", \
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(unsigned int)offsetof(typeof(field), item), \
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(unsigned int)sizeof(field.item)); \
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if (!ret) \
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return 0;
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#undef __array
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#define __array(type, item, len) \
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ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \
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"offset:%u;\tsize:%u;\n", \
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(unsigned int)offsetof(typeof(field), item), \
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(unsigned int)sizeof(field.item)); \
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if (!ret) \
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return 0;
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#undef __string
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#define __string(item, src) \
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ret = trace_seq_printf(s, "\tfield: __str_loc " #item ";\t" \
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"offset:%u;tsize:%u;\n", \
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(unsigned int)offsetof(typeof(field), \
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__str_loc_##item), \
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(unsigned int)sizeof(field.__str_loc_##item)); \
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if (!ret) \
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return 0;
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#undef __entry
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#define __entry REC
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#undef TP_printk
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#define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
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#undef TP_fast_assign
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#define TP_fast_assign(args...) args
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#undef TRACE_EVENT
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#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
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static int \
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ftrace_format_##call(struct trace_seq *s) \
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{ \
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struct ftrace_raw_##call field __attribute__((unused)); \
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int ret = 0; \
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\
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tstruct; \
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\
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trace_seq_printf(s, "\nprint fmt: " print); \
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\
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return ret; \
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}
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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#undef __field
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#define __field(type, item) \
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ret = trace_define_field(event_call, #type, #item, \
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offsetof(typeof(field), item), \
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sizeof(field.item), is_signed_type(type)); \
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if (ret) \
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return ret;
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#undef __array
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#define __array(type, item, len) \
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BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
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ret = trace_define_field(event_call, #type "[" #len "]", #item, \
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offsetof(typeof(field), item), \
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sizeof(field.item), 0); \
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if (ret) \
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return ret;
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#undef __string
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#define __string(item, src) \
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ret = trace_define_field(event_call, "__str_loc", #item, \
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offsetof(typeof(field), __str_loc_##item), \
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sizeof(field.__str_loc_##item), 0);
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#undef TRACE_EVENT
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#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
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int \
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ftrace_define_fields_##call(void) \
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{ \
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struct ftrace_raw_##call field; \
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struct ftrace_event_call *event_call = &event_##call; \
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int ret; \
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\
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__common_field(int, type, 1); \
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__common_field(unsigned char, flags, 0); \
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__common_field(unsigned char, preempt_count, 0); \
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__common_field(int, pid, 1); \
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__common_field(int, tgid, 1); \
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\
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tstruct; \
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\
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return ret; \
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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 <trace/trace_events.h> to include the following:
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*
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* static void ftrace_event_<call>(proto)
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* {
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* event_trace_printk(_RET_IP_, "<call>: " <fmt>);
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* }
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*
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* static int ftrace_reg_event_<call>(void)
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* {
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* int ret;
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*
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* ret = register_trace_<call>(ftrace_event_<call>);
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* if (!ret)
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* pr_info("event trace: Could not activate trace point "
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* "probe to <call>");
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* return ret;
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* }
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*
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* static void ftrace_unreg_event_<call>(void)
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* {
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* unregister_trace_<call>(ftrace_event_<call>);
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* }
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*
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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 ftrace_event_call event_<call>;
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*
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* static void ftrace_raw_event_<call>(proto)
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* {
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* struct ring_buffer_event *event;
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* struct ftrace_raw_<call> *entry; <-- defined in stage 1
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* unsigned long irq_flags;
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* int pc;
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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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* event = trace_current_buffer_lock_reserve(event_<call>.id,
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* sizeof(struct ftrace_raw_<call>),
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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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* trace_current_buffer_unlock_commit(event, irq_flags, pc);
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* }
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*
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* static int ftrace_raw_reg_event_<call>(void)
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* {
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* int ret;
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*
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* ret = register_trace_<call>(ftrace_raw_event_<call>);
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* if (!ret)
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* pr_info("event trace: Could not activate trace point "
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* "probe to <call>");
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* return ret;
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* }
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*
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* static void ftrace_unreg_event_<call>(void)
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* {
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* unregister_trace_<call>(ftrace_raw_event_<call>);
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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 = ftrace_raw_output_<call>, <-- stage 2
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* };
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*
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* static int ftrace_raw_init_event_<call>(void)
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* {
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* int id;
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*
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* id = register_ftrace_event(&ftrace_event_type_<call>);
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* if (!id)
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* return -ENODEV;
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* event_<call>.id = id;
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* return 0;
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* }
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*
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* static struct ftrace_event_call __used
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* __attribute__((__aligned__(4)))
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* __attribute__((section("_ftrace_events"))) event_<call> = {
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* .name = "<call>",
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* .system = "<system>",
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* .raw_init = ftrace_raw_init_event_<call>,
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* .regfunc = ftrace_reg_event_<call>,
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* .unregfunc = ftrace_unreg_event_<call>,
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* .show_format = ftrace_format_<call>,
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* }
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*
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*/
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#undef TP_FMT
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#define TP_FMT(fmt, args...) fmt "\n", ##args
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#ifdef CONFIG_EVENT_PROFILE
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#define _TRACE_PROFILE(call, proto, args) \
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static void ftrace_profile_##call(proto) \
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{ \
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extern void perf_tpcounter_event(int); \
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perf_tpcounter_event(event_##call.id); \
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} \
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\
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static int ftrace_profile_enable_##call(struct ftrace_event_call *event_call) \
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{ \
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int ret = 0; \
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\
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if (!atomic_inc_return(&event_call->profile_count)) \
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ret = register_trace_##call(ftrace_profile_##call); \
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\
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return ret; \
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} \
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\
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static void ftrace_profile_disable_##call(struct ftrace_event_call *event_call)\
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{ \
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if (atomic_add_negative(-1, &event_call->profile_count)) \
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unregister_trace_##call(ftrace_profile_##call); \
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}
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#define _TRACE_PROFILE_INIT(call) \
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.profile_count = ATOMIC_INIT(-1), \
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.profile_enable = ftrace_profile_enable_##call, \
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.profile_disable = ftrace_profile_disable_##call,
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#else
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#define _TRACE_PROFILE(call, proto, args)
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#define _TRACE_PROFILE_INIT(call)
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#endif
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#undef __entry
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#define __entry entry
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#undef __field
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#define __field(type, item)
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#undef __array
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#define __array(type, item, len)
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#undef __string
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#define __string(item, src) \
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__str_offsets.item = __str_size + \
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offsetof(typeof(*entry), __str_data); \
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__str_size += strlen(src) + 1;
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#undef __assign_str
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#define __assign_str(dst, src) \
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__entry->__str_loc_##dst = __str_offsets.dst; \
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strcpy(__get_str(dst), src);
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#undef TRACE_EVENT
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#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
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_TRACE_PROFILE(call, PARAMS(proto), PARAMS(args)) \
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\
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static struct ftrace_event_call event_##call; \
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\
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static void ftrace_raw_event_##call(proto) \
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{ \
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struct ftrace_str_offsets_##call __maybe_unused __str_offsets; \
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struct ftrace_event_call *event_call = &event_##call; \
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struct ring_buffer_event *event; \
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struct ftrace_raw_##call *entry; \
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unsigned long irq_flags; \
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int __str_size = 0; \
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int pc; \
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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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tstruct; \
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\
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event = trace_current_buffer_lock_reserve(event_##call.id, \
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sizeof(struct ftrace_raw_##call) + __str_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; \
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\
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if (!filter_current_check_discard(event_call, entry, event)) \
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trace_nowake_buffer_unlock_commit(event, irq_flags, pc); \
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} \
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\
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static int ftrace_raw_reg_event_##call(void) \
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{ \
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int ret; \
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\
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ret = register_trace_##call(ftrace_raw_event_##call); \
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if (ret) \
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pr_info("event trace: Could not activate trace point " \
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"probe to " #call "\n"); \
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return ret; \
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} \
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\
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static void ftrace_raw_unreg_event_##call(void) \
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{ \
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unregister_trace_##call(ftrace_raw_event_##call); \
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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 = ftrace_raw_output_##call, \
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}; \
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\
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static int ftrace_raw_init_event_##call(void) \
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{ \
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int id; \
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\
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id = register_ftrace_event(&ftrace_event_type_##call); \
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if (!id) \
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return -ENODEV; \
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event_##call.id = id; \
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INIT_LIST_HEAD(&event_##call.fields); \
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init_preds(&event_##call); \
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return 0; \
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} \
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\
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static struct ftrace_event_call __used \
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__attribute__((__aligned__(4))) \
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__attribute__((section("_ftrace_events"))) event_##call = { \
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.name = #call, \
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.system = __stringify(TRACE_SYSTEM), \
|
|
.event = &ftrace_event_type_##call, \
|
|
.raw_init = ftrace_raw_init_event_##call, \
|
|
.regfunc = ftrace_raw_reg_event_##call, \
|
|
.unregfunc = ftrace_raw_unreg_event_##call, \
|
|
.show_format = ftrace_format_##call, \
|
|
.define_fields = ftrace_define_fields_##call, \
|
|
_TRACE_PROFILE_INIT(call) \
|
|
}
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
#undef _TRACE_PROFILE
|
|
#undef _TRACE_PROFILE_INIT
|
|
|