725 lines
19 KiB
C
725 lines
19 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) u32 __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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* 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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#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) u32 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 " #type "[] " #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 TP_perf_assign
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#define TP_perf_assign(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 ftrace_event_call *unused, \
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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 & 0xffff))
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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(struct ftrace_event_call *event_call) \
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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_define_common_fields(event_call); \
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if (ret) \
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return ret; \
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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_offsets->item |= (len * sizeof(type)) << 16; \
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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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#ifdef CONFIG_EVENT_PROFILE
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/*
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* Generate the functions needed for tracepoint perf_counter support.
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*
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* NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
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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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*
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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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\
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static void ftrace_profile_##call(proto); \
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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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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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#endif
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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_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_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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\
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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; \
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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 = ftrace_get_offsets_##call(&__data_offsets, args); \
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\
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event = trace_current_buffer_lock_reserve(event_##call.id, \
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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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\
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tstruct \
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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 *ptr) \
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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 *ptr) \
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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), \
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.event = &ftrace_event_type_##call, \
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.raw_init = ftrace_raw_init_event_##call, \
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.regfunc = ftrace_raw_reg_event_##call, \
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.unregfunc = ftrace_raw_unreg_event_##call, \
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.show_format = ftrace_format_##call, \
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.define_fields = ftrace_define_fields_##call, \
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_TRACE_PROFILE_INIT(call) \
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}
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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/*
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* Define the insertion callback to profile events
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*
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* The job is very similar to ftrace_raw_event_<call> except that we don't
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* insert in the ring buffer but in a perf counter.
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*
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* static void ftrace_profile_<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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* extern void perf_tpcounter_event(int, u64, u64, void *, int);
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* struct ftrace_raw_##call *entry;
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* u64 __addr = 0, __count = 1;
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* unsigned long irq_flags;
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* int __entry_size;
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* int __data_size;
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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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* __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
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*
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* // Below we want to get the aligned size by taking into account
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* // the u32 field that will later store the buffer size
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* __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
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* sizeof(u64));
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* __entry_size -= sizeof(u32);
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*
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* do {
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* char raw_data[__entry_size]; <- allocate our sample in the stack
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* struct trace_entry *ent;
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*
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* zero dead bytes from alignment to avoid stack leak to userspace:
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*
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* *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
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* entry = (struct ftrace_raw_<call> *)raw_data;
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* ent = &entry->ent;
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* tracing_generic_entry_update(ent, irq_flags, pc);
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|
* ent->type = event_call->id;
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|
*
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* <tstruct> <- do some jobs with dynamic arrays
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|
*
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* <assign> <- affect our values
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|
*
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|
* perf_tpcounter_event(event_call->id, __addr, __count, entry,
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* __entry_size); <- submit them to perf counter
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* } while (0);
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*
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* }
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*/
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|
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#ifdef CONFIG_EVENT_PROFILE
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|
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#undef __perf_addr
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|
#define __perf_addr(a) __addr = (a)
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|
|
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#undef __perf_count
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|
#define __perf_count(c) __count = (c)
|
|
|
|
#undef TRACE_EVENT
|
|
#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
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|
static void ftrace_profile_##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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extern void perf_tpcounter_event(int, u64, u64, void *, int); \
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struct ftrace_raw_##call *entry; \
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|
u64 __addr = 0, __count = 1; \
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|
unsigned long irq_flags; \
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|
int __entry_size; \
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|
int __data_size; \
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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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|
__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
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|
__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
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|
sizeof(u64)); \
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|
__entry_size -= sizeof(u32); \
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|
\
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|
do { \
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|
char raw_data[__entry_size]; \
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|
struct trace_entry *ent; \
|
|
\
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|
*(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL; \
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|
entry = (struct ftrace_raw_##call *)raw_data; \
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|
ent = &entry->ent; \
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|
tracing_generic_entry_update(ent, irq_flags, pc); \
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|
ent->type = event_call->id; \
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|
\
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|
tstruct \
|
|
\
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|
{ assign; } \
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|
\
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|
perf_tpcounter_event(event_call->id, __addr, __count, entry,\
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|
__entry_size); \
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|
} while (0); \
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|
\
|
|
}
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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|
#endif /* CONFIG_EVENT_PROFILE */
|
|
|
|
#undef _TRACE_PROFILE_INIT
|
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|