mirror of
https://github.com/edk2-porting/linux-next.git
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d0ee8f4a1f
The name "ftrace" really refers to the function hook infrastructure. It is not about the trace_events. The function ftrace_get_offsets_##call() is used to find the offset into dynamically allocated trace event fields for printing. It has nothing to do with function tracing. Rename it. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
509 lines
14 KiB
C
509 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 trace_event_raw_<call> {
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* struct trace_entry ent;
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* <type> <item>;
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* <type2> <item2>[<len>];
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* [...]
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* };
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*
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* The <type> <item> is created by the __field(type, item) macro or
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* the __array(type2, item2, len) macro.
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* We simply do "type item;", and that will create the fields
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* in the structure.
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*/
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#include <linux/trace_events.h>
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#ifndef TRACE_SYSTEM_VAR
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#define TRACE_SYSTEM_VAR TRACE_SYSTEM
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#endif
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#define __app__(x, y) str__##x##y
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#define __app(x, y) __app__(x, y)
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#define TRACE_SYSTEM_STRING __app(TRACE_SYSTEM_VAR,__trace_system_name)
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#define TRACE_MAKE_SYSTEM_STR() \
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static const char TRACE_SYSTEM_STRING[] = \
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__stringify(TRACE_SYSTEM)
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TRACE_MAKE_SYSTEM_STR();
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#undef TRACE_DEFINE_ENUM
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#define TRACE_DEFINE_ENUM(a) \
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static struct trace_enum_map __used __initdata \
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__##TRACE_SYSTEM##_##a = \
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{ \
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.system = TRACE_SYSTEM_STRING, \
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.enum_string = #a, \
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.enum_value = a \
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}; \
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static struct trace_enum_map __used \
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__attribute__((section("_ftrace_enum_map"))) \
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*TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
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/*
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* DECLARE_EVENT_CLASS can be used to add a generic function
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* handlers for events. That is, if all events have the same
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* parameters and just have distinct trace points.
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* Each tracepoint can be defined with DEFINE_EVENT and that
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* will map the DECLARE_EVENT_CLASS to the tracepoint.
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*
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* TRACE_EVENT is a one to one mapping between tracepoint and template.
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*/
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#undef TRACE_EVENT
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#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
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DECLARE_EVENT_CLASS(name, \
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PARAMS(proto), \
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PARAMS(args), \
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PARAMS(tstruct), \
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PARAMS(assign), \
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PARAMS(print)); \
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DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
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#undef __field
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#define __field(type, item) type item;
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#undef __field_ext
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#define __field_ext(type, item, filter_type) type item;
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#undef __field_struct
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#define __field_struct(type, item) type item;
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#undef __field_struct_ext
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#define __field_struct_ext(type, item, filter_type) 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 __bitmask
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#define __bitmask(item, nr_bits) __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 DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
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struct trace_event_raw_##name { \
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struct trace_entry ent; \
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tstruct \
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char __data[0]; \
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}; \
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\
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static struct trace_event_class event_class_##name;
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#undef DEFINE_EVENT
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#define DEFINE_EVENT(template, name, proto, args) \
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static struct trace_event_call __used \
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__attribute__((__aligned__(4))) event_##name
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#undef DEFINE_EVENT_FN
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#define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg) \
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DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
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#undef DEFINE_EVENT_PRINT
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#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
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DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
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/* Callbacks are meaningless to ftrace. */
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#undef TRACE_EVENT_FN
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#define TRACE_EVENT_FN(name, proto, args, tstruct, \
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assign, print, reg, unreg) \
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TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
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PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
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#undef TRACE_EVENT_FLAGS
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#define TRACE_EVENT_FLAGS(name, value) \
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__TRACE_EVENT_FLAGS(name, value)
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#undef TRACE_EVENT_PERF_PERM
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#define TRACE_EVENT_PERF_PERM(name, expr...) \
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__TRACE_EVENT_PERF_PERM(name, expr)
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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/*
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* Stage 2 of the trace events.
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*
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* Include the following:
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*
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* struct trace_event_data_offsets_<call> {
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* u32 <item1>;
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* u32 <item2>;
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* [...]
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* };
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*
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* The __dynamic_array() macro will create each u32 <item>, this is
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* to keep the offset of each array from the beginning of the event.
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* The size of an array is also encoded, in the higher 16 bits of <item>.
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*/
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#undef TRACE_DEFINE_ENUM
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#define TRACE_DEFINE_ENUM(a)
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#undef __field
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#define __field(type, item)
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#undef __field_ext
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#define __field_ext(type, item, filter_type)
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#undef __field_struct
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#define __field_struct(type, item)
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#undef __field_struct_ext
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#define __field_struct_ext(type, item, filter_type)
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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 __bitmask
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#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
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#undef DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
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struct trace_event_data_offsets_##call { \
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tstruct; \
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};
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#undef DEFINE_EVENT
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#define DEFINE_EVENT(template, name, proto, args)
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#undef DEFINE_EVENT_PRINT
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#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
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DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
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#undef TRACE_EVENT_FLAGS
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#define TRACE_EVENT_FLAGS(event, flag)
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#undef TRACE_EVENT_PERF_PERM
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#define TRACE_EVENT_PERF_PERM(event, expr...)
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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/*
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* Stage 3 of the trace events.
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*
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* Override the macros in <trace/trace_events.h> to include the following:
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*
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* enum print_line_t
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* trace_raw_output_<call>(struct trace_iterator *iter, int flags)
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* {
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* struct trace_seq *s = &iter->seq;
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* struct trace_event_raw_<call> *field; <-- defined in stage 1
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* struct trace_entry *entry;
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* struct trace_seq *p = &iter->tmp_seq;
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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>->event.type) {
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* WARN_ON_ONCE(1);
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* return TRACE_TYPE_UNHANDLED;
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* }
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*
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* field = (typeof(field))entry;
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*
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* trace_seq_init(p);
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* ret = trace_seq_printf(s, "%s: ", <call>);
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* if (ret)
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* ret = trace_seq_printf(s, <TP_printk> "\n");
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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_dynamic_array_len
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#define __get_dynamic_array_len(field) \
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((__entry->__data_loc_##field >> 16) & 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 __get_bitmask
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#define __get_bitmask(field) \
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({ \
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void *__bitmask = __get_dynamic_array(field); \
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unsigned int __bitmask_size; \
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__bitmask_size = __get_dynamic_array_len(field); \
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trace_print_bitmask_seq(p, __bitmask, __bitmask_size); \
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})
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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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trace_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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trace_print_symbols_seq(p, value, symbols); \
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})
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#undef __print_symbolic_u64
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#if BITS_PER_LONG == 32
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#define __print_symbolic_u64(value, symbol_array...) \
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({ \
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static const struct trace_print_flags_u64 symbols[] = \
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{ symbol_array, { -1, NULL } }; \
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trace_print_symbols_seq_u64(p, value, symbols); \
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})
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#else
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#define __print_symbolic_u64(value, symbol_array...) \
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__print_symbolic(value, symbol_array)
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#endif
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#undef __print_hex
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#define __print_hex(buf, buf_len) trace_print_hex_seq(p, buf, buf_len)
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#undef __print_array
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#define __print_array(array, count, el_size) \
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({ \
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BUILD_BUG_ON(el_size != 1 && el_size != 2 && \
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el_size != 4 && el_size != 8); \
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trace_print_array_seq(p, array, count, el_size); \
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})
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#undef DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
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static notrace enum print_line_t \
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trace_raw_output_##call(struct trace_iterator *iter, int flags, \
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struct trace_event *trace_event) \
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{ \
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struct trace_seq *s = &iter->seq; \
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struct trace_seq __maybe_unused *p = &iter->tmp_seq; \
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struct trace_event_raw_##call *field; \
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int ret; \
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\
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field = (typeof(field))iter->ent; \
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\
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ret = trace_raw_output_prep(iter, trace_event); \
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if (ret != TRACE_TYPE_HANDLED) \
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return ret; \
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\
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trace_seq_printf(s, print); \
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\
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return trace_handle_return(s); \
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} \
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static struct trace_event_functions trace_event_type_funcs_##call = { \
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.trace = trace_raw_output_##call, \
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};
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#undef DEFINE_EVENT_PRINT
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#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
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static notrace enum print_line_t \
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trace_raw_output_##call(struct trace_iterator *iter, int flags, \
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struct trace_event *event) \
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{ \
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struct trace_event_raw_##template *field; \
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struct trace_entry *entry; \
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struct trace_seq *p = &iter->tmp_seq; \
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\
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entry = iter->ent; \
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\
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if (entry->type != event_##call.event.type) { \
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WARN_ON_ONCE(1); \
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return TRACE_TYPE_UNHANDLED; \
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} \
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\
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field = (typeof(field))entry; \
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\
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trace_seq_init(p); \
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return trace_output_call(iter, #call, print); \
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} \
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static struct trace_event_functions trace_event_type_funcs_##call = { \
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.trace = trace_raw_output_##call, \
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};
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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#undef __field_ext
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#define __field_ext(type, item, filter_type) \
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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), \
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is_signed_type(type), filter_type); \
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if (ret) \
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return ret;
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#undef __field_struct_ext
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#define __field_struct_ext(type, item, filter_type) \
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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), \
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0, filter_type); \
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if (ret) \
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return ret;
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#undef __field
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#define __field(type, item) __field_ext(type, item, FILTER_OTHER)
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#undef __field_struct
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#define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER)
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#undef __array
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#define __array(type, item, len) \
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do { \
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char *type_str = #type"["__stringify(len)"]"; \
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BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
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ret = trace_define_field(event_call, type_str, #item, \
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offsetof(typeof(field), item), \
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sizeof(field.item), \
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is_signed_type(type), FILTER_OTHER); \
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if (ret) \
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return ret; \
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} while (0);
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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), \
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is_signed_type(type), FILTER_OTHER);
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#undef __string
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#define __string(item, src) __dynamic_array(char, item, -1)
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#undef __bitmask
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#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
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#undef DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
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static int notrace __init \
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trace_event_define_fields_##call(struct trace_event_call *event_call) \
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{ \
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struct trace_event_raw_##call field; \
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int 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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#undef DEFINE_EVENT
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#define DEFINE_EVENT(template, name, proto, args)
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#undef DEFINE_EVENT_PRINT
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#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
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DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
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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 __field_ext
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#define __field_ext(type, item, filter_type)
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#undef __field_struct
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#define __field_struct(type, item)
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#undef __field_struct_ext
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#define __field_struct_ext(type, item, filter_type)
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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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__item_length = (len) * sizeof(type); \
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__data_offsets->item = __data_size + \
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offsetof(typeof(*entry), __data); \
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__data_offsets->item |= __item_length << 16; \
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__data_size += __item_length;
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#undef __string
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#define __string(item, src) __dynamic_array(char, item, \
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strlen((src) ? (const char *)(src) : "(null)") + 1)
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/*
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* __bitmask_size_in_bytes_raw is the number of bytes needed to hold
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* num_possible_cpus().
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*/
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#define __bitmask_size_in_bytes_raw(nr_bits) \
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(((nr_bits) + 7) / 8)
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#define __bitmask_size_in_longs(nr_bits) \
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((__bitmask_size_in_bytes_raw(nr_bits) + \
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((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
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/*
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* __bitmask_size_in_bytes is the number of bytes needed to hold
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* num_possible_cpus() padded out to the nearest long. This is what
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* is saved in the buffer, just to be consistent.
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*/
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#define __bitmask_size_in_bytes(nr_bits) \
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(__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
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#undef __bitmask
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#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, \
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__bitmask_size_in_longs(nr_bits))
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#undef DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
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static inline notrace int trace_event_get_offsets_##call( \
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struct trace_event_data_offsets_##call *__data_offsets, proto) \
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{ \
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int __data_size = 0; \
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int __maybe_unused __item_length; \
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struct trace_event_raw_##call __maybe_unused *entry; \
|
|
\
|
|
tstruct; \
|
|
\
|
|
return __data_size; \
|
|
}
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|
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|
#undef DEFINE_EVENT
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|
#define DEFINE_EVENT(template, name, proto, args)
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|
|
|
#undef DEFINE_EVENT_PRINT
|
|
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
|
|
DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
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|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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|
|