6ff9a64d2a
By moving the macro that creates the print format code above the
defining of the event macro helpers (__get_str, __print_symbolic,
and __get_dynamic_array), we get a little cleaner print format.
Instead of:
(char *)((void *)REC + REC->__data_loc_name)
we get:
__get_str(name)
Instead of:
({ static const struct trace_print_flags symbols[] = { { HI_SOFTIRQ, "HI" }, {
we get:
__print_symbolic(REC->vec, { HI_SOFTIRQ, "HI" }, {
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
592 lines
15 KiB
C
592 lines
15 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 __field
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#define __field(type, item) type item;
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#undef __array
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#define __array(type, item, len) type item[len];
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#undef __dynamic_array
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#define __dynamic_array(type, item, len) unsigned short __data_loc_##item;
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#undef __string
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#define __string(item, src) __dynamic_array(char, item, -1)
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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 __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_data_offsets_<call> {
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* int <item1>;
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* int <item2>;
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* [...]
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* };
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*
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* The __dynamic_array() macro will create each int <item>, this is
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* to keep the offset of each array from the beginning of the event.
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*/
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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 __dynamic_array
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#define __dynamic_array(type, item, len) int item;
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#undef __string
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#define __string(item, src) __dynamic_array(char, item, -1)
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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_data_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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* 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 __dynamic_array
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#define __dynamic_array(type, item, len) \
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ret = trace_seq_printf(s, "\tfield:__data_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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__data_loc_##item), \
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(unsigned int)sizeof(field.__data_loc_##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) __dynamic_array(char, item, -1)
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#undef __entry
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#define __entry REC
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#undef __print_symbolic
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#undef __get_dynamic_array
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#undef __get_str
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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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/*
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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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* trace_seq_init(p);
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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_dynamic_array
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#define __get_dynamic_array(field) \
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((void *)__entry + __entry->__data_loc_##field)
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#undef __get_str
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#define __get_str(field) (char *)__get_dynamic_array(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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trace_seq_init(p); \
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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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#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 __dynamic_array
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#define __dynamic_array(type, item, len) \
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ret = trace_define_field(event_call, "__data_loc" "[" #type "]", #item,\
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offsetof(typeof(field), __data_loc_##item), \
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sizeof(field.__data_loc_##item), 0);
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#undef __string
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#define __string(item, src) __dynamic_array(char, item, -1)
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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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* remember the offset of each array from the beginning of the event.
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*/
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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 __dynamic_array
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#define __dynamic_array(type, item, len) \
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__data_offsets->item = __data_size + \
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offsetof(typeof(*entry), __data); \
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__data_size += (len) * sizeof(type);
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#undef __string
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#define __string(item, src) __dynamic_array(char, item, strlen(src) + 1) \
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#undef TRACE_EVENT
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#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
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static inline int ftrace_get_offsets_##call( \
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struct ftrace_data_offsets_##call *__data_offsets, proto) \
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{ \
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int __data_size = 0; \
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struct ftrace_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 <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 __dynamic_array
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#define __dynamic_array(type, item, len) \
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__entry->__data_loc_##item = __data_offsets.item;
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#undef __string
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#define __string(item, src) __dynamic_array(char, item, -1) \
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#undef __assign_str
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#define __assign_str(dst, src) \
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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_data_offsets_##call __maybe_unused __data_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 __data_size; \
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|
int pc; \
|
|
\
|
|
local_save_flags(irq_flags); \
|
|
pc = preempt_count(); \
|
|
\
|
|
__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
|
|
\
|
|
event = trace_current_buffer_lock_reserve(event_##call.id, \
|
|
sizeof(*entry) + __data_size, \
|
|
irq_flags, pc); \
|
|
if (!event) \
|
|
return; \
|
|
entry = ring_buffer_event_data(event); \
|
|
\
|
|
\
|
|
tstruct \
|
|
\
|
|
{ assign; } \
|
|
\
|
|
if (!filter_current_check_discard(event_call, entry, event)) \
|
|
trace_nowake_buffer_unlock_commit(event, irq_flags, pc); \
|
|
} \
|
|
\
|
|
static int ftrace_raw_reg_event_##call(void) \
|
|
{ \
|
|
int ret; \
|
|
\
|
|
ret = register_trace_##call(ftrace_raw_event_##call); \
|
|
if (ret) \
|
|
pr_info("event trace: Could not activate trace point " \
|
|
"probe to " #call "\n"); \
|
|
return ret; \
|
|
} \
|
|
\
|
|
static void ftrace_raw_unreg_event_##call(void) \
|
|
{ \
|
|
unregister_trace_##call(ftrace_raw_event_##call); \
|
|
} \
|
|
\
|
|
static struct trace_event ftrace_event_type_##call = { \
|
|
.trace = ftrace_raw_output_##call, \
|
|
}; \
|
|
\
|
|
static int ftrace_raw_init_event_##call(void) \
|
|
{ \
|
|
int id; \
|
|
\
|
|
id = register_ftrace_event(&ftrace_event_type_##call); \
|
|
if (!id) \
|
|
return -ENODEV; \
|
|
event_##call.id = id; \
|
|
INIT_LIST_HEAD(&event_##call.fields); \
|
|
init_preds(&event_##call); \
|
|
return 0; \
|
|
} \
|
|
\
|
|
static struct ftrace_event_call __used \
|
|
__attribute__((__aligned__(4))) \
|
|
__attribute__((section("_ftrace_events"))) event_##call = { \
|
|
.name = #call, \
|
|
.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
|
|
|