38516ab59f
This patch adds data to be passed to tracepoint callbacks.
The created functions from DECLARE_TRACE() now need a mandatory data
parameter. For example:
DECLARE_TRACE(mytracepoint, int value, value)
Will create the register function:
int register_trace_mytracepoint((void(*)(void *data, int value))probe,
void *data);
As the first argument, all callbacks (probes) must take a (void *data)
parameter. So a callback for the above tracepoint will look like:
void myprobe(void *data, int value)
{
}
The callback may choose to ignore the data parameter.
This change allows callbacks to register a private data pointer along
with the function probe.
void mycallback(void *data, int value);
register_trace_mytracepoint(mycallback, mydata);
Then the mycallback() will receive the "mydata" as the first parameter
before the args.
A more detailed example:
DECLARE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
/* In the C file */
DEFINE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
[...]
trace_mytracepoint(status);
/* In a file registering this tracepoint */
int my_callback(void *data, int status)
{
struct my_struct my_data = data;
[...]
}
[...]
my_data = kmalloc(sizeof(*my_data), GFP_KERNEL);
init_my_data(my_data);
register_trace_mytracepoint(my_callback, my_data);
The same callback can also be registered to the same tracepoint as long
as the data registered is different. Note, the data must also be used
to unregister the callback:
unregister_trace_mytracepoint(my_callback, my_data);
Because of the data parameter, tracepoints declared this way can not have
no args. That is:
DECLARE_TRACE(mytracepoint, TP_PROTO(void), TP_ARGS());
will cause an error.
If no arguments are needed, a new macro can be used instead:
DECLARE_TRACE_NOARGS(mytracepoint);
Since there are no arguments, the proto and args fields are left out.
This is part of a series to make the tracepoint footprint smaller:
text data bss dec hex filename
4913961 1088356 861512 6863829 68bbd5 vmlinux.orig
4914025 1088868 861512 6864405 68be15 vmlinux.class
4918492 1084612 861512 6864616 68bee8 vmlinux.tracepoint
Again, this patch also increases the size of the kernel, but
lays the ground work for decreasing it.
v5: Fixed net/core/drop_monitor.c to handle these updates.
v4: Moved the DECLARE_TRACE() DECLARE_TRACE_NOARGS out of the
#ifdef CONFIG_TRACE_POINTS, since the two are the same in both
cases. The __DECLARE_TRACE() is what changes.
Thanks to Frederic Weisbecker for pointing this out.
v3: Made all register_* functions require data to be passed and
all callbacks to take a void * parameter as its first argument.
This makes the calling functions comply with C standards.
Also added more comments to the modifications of DECLARE_TRACE().
v2: Made the DECLARE_TRACE() have the ability to pass arguments
and added a new DECLARE_TRACE_NOARGS() for tracepoints that
do not need any arguments.
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
812 lines
22 KiB
C
812 lines
22 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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/*
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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 __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 DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(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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\
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static struct ftrace_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 ftrace_event_call \
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__attribute__((__aligned__(4))) event_##name
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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 __cpparg
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#define __cpparg(arg...) arg
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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, __cpparg(proto), __cpparg(args), \
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__cpparg(tstruct), __cpparg(assign), __cpparg(print)) \
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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 __field_ext
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#define __field_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 DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(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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#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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* 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, "%s: ", <call>);
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* if (ret)
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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 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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ftrace_raw_output_id_##call(int event_id, const char *name, \
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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_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, "%s: ", name); \
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if (ret) \
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ret = trace_seq_printf(s, 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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#undef DEFINE_EVENT
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#define DEFINE_EVENT(template, name, proto, args) \
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static notrace enum print_line_t \
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ftrace_raw_output_##name(struct trace_iterator *iter, int flags) \
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{ \
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return ftrace_raw_output_id_##template(event_##name.id, \
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#name, iter, flags); \
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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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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_##template *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, "%s: ", #call); \
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if (ret) \
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ret = trace_seq_printf(s, 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_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
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#define __field(type, item) __field_ext(type, item, FILTER_OTHER)
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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), \
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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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#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 DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
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static int notrace \
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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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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 __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 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 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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#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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#ifdef CONFIG_PERF_EVENTS
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/*
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* Generate the functions needed for tracepoint perf_event 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>(void)
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* {
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* return register_trace_<call>(ftrace_profile_<call>);
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* }
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*
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* static void ftrace_profile_disable_<call>(void)
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* {
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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 DECLARE_EVENT_CLASS
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)
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#undef DEFINE_EVENT
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#define DEFINE_EVENT(template, name, proto, args) \
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\
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static void perf_trace_##name(void *, proto); \
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\
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static notrace int \
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perf_trace_enable_##name(struct ftrace_event_call *unused) \
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{ \
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return register_trace_##name(perf_trace_##name, NULL); \
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} \
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\
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static notrace void \
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perf_trace_disable_##name(struct ftrace_event_call *unused) \
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{ \
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unregister_trace_##name(perf_trace_##name, NULL); \
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}
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#undef DEFINE_EVENT_PRINT
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#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
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DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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#endif /* CONFIG_PERF_EVENTS */
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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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* 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 ftrace_data_offsets_<call> __maybe_unused __data_offsets;
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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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* struct ring_buffer *buffer;
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* unsigned long irq_flags;
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* int __data_size;
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* int pc;
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*
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* local_save_flags(irq_flags);
|
|
* pc = preempt_count();
|
|
*
|
|
* __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
|
|
*
|
|
* event = trace_current_buffer_lock_reserve(&buffer,
|
|
* event_<call>.id,
|
|
* sizeof(*entry) + __data_size,
|
|
* irq_flags, pc);
|
|
* if (!event)
|
|
* return;
|
|
* entry = ring_buffer_event_data(event);
|
|
*
|
|
* { <assign>; } <-- Here we assign the entries by the __field and
|
|
* __array macros.
|
|
*
|
|
* if (!filter_current_check_discard(buffer, event_call, entry, event))
|
|
* trace_current_buffer_unlock_commit(buffer,
|
|
* event, irq_flags, pc);
|
|
* }
|
|
*
|
|
* static int ftrace_raw_reg_event_<call>(struct ftrace_event_call *unused)
|
|
* {
|
|
* return register_trace_<call>(ftrace_raw_event_<call>);
|
|
* }
|
|
*
|
|
* static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
|
|
* {
|
|
* unregister_trace_<call>(ftrace_raw_event_<call>);
|
|
* }
|
|
*
|
|
* static struct trace_event ftrace_event_type_<call> = {
|
|
* .trace = ftrace_raw_output_<call>, <-- stage 2
|
|
* };
|
|
*
|
|
* static const char print_fmt_<call>[] = <TP_printk>;
|
|
*
|
|
* static struct ftrace_event_class __used event_class_<template> = {
|
|
* .system = "<system>",
|
|
* };
|
|
*
|
|
* static struct ftrace_event_call __used
|
|
* __attribute__((__aligned__(4)))
|
|
* __attribute__((section("_ftrace_events"))) event_<call> = {
|
|
* .name = "<call>",
|
|
* .class = event_class_<template>,
|
|
* .raw_init = trace_event_raw_init,
|
|
* .regfunc = ftrace_raw_reg_event_<call>,
|
|
* .unregfunc = ftrace_raw_unreg_event_<call>,
|
|
* .print_fmt = print_fmt_<call>,
|
|
* .define_fields = ftrace_define_fields_<call>,
|
|
* };
|
|
*
|
|
*/
|
|
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
|
|
#define _TRACE_PERF_INIT(call) \
|
|
.perf_event_enable = perf_trace_enable_##call, \
|
|
.perf_event_disable = perf_trace_disable_##call,
|
|
|
|
#else
|
|
#define _TRACE_PERF_INIT(call)
|
|
#endif /* CONFIG_PERF_EVENTS */
|
|
|
|
#undef __entry
|
|
#define __entry entry
|
|
|
|
#undef __field
|
|
#define __field(type, item)
|
|
|
|
#undef __array
|
|
#define __array(type, item, len)
|
|
|
|
#undef __dynamic_array
|
|
#define __dynamic_array(type, item, len) \
|
|
__entry->__data_loc_##item = __data_offsets.item;
|
|
|
|
#undef __string
|
|
#define __string(item, src) __dynamic_array(char, item, -1) \
|
|
|
|
#undef __assign_str
|
|
#define __assign_str(dst, src) \
|
|
strcpy(__get_str(dst), src);
|
|
|
|
#undef TP_fast_assign
|
|
#define TP_fast_assign(args...) args
|
|
|
|
#undef TP_perf_assign
|
|
#define TP_perf_assign(args...)
|
|
|
|
#undef DECLARE_EVENT_CLASS
|
|
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
\
|
|
static notrace void \
|
|
ftrace_raw_event_id_##call(struct ftrace_event_call *event_call, \
|
|
proto) \
|
|
{ \
|
|
struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
|
|
struct ring_buffer_event *event; \
|
|
struct ftrace_raw_##call *entry; \
|
|
struct ring_buffer *buffer; \
|
|
unsigned long irq_flags; \
|
|
int __data_size; \
|
|
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(&buffer, \
|
|
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(buffer, event_call, entry, event)) \
|
|
trace_nowake_buffer_unlock_commit(buffer, \
|
|
event, irq_flags, pc); \
|
|
}
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, call, proto, args) \
|
|
\
|
|
static notrace void ftrace_raw_event_##call(void *__ignore, proto) \
|
|
{ \
|
|
ftrace_raw_event_id_##template(&event_##call, args); \
|
|
} \
|
|
\
|
|
static notrace int \
|
|
ftrace_raw_reg_event_##call(struct ftrace_event_call *unused) \
|
|
{ \
|
|
return register_trace_##call(ftrace_raw_event_##call, NULL); \
|
|
} \
|
|
\
|
|
static notrace void \
|
|
ftrace_raw_unreg_event_##call(struct ftrace_event_call *unused) \
|
|
{ \
|
|
unregister_trace_##call(ftrace_raw_event_##call, NULL); \
|
|
} \
|
|
\
|
|
static struct trace_event ftrace_event_type_##call = { \
|
|
.trace = ftrace_raw_output_##call, \
|
|
};
|
|
|
|
#undef DEFINE_EVENT_PRINT
|
|
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
|
|
DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
#undef __entry
|
|
#define __entry REC
|
|
|
|
#undef __print_flags
|
|
#undef __print_symbolic
|
|
#undef __get_dynamic_array
|
|
#undef __get_str
|
|
|
|
#undef TP_printk
|
|
#define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args)
|
|
|
|
#undef DECLARE_EVENT_CLASS
|
|
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
static const char print_fmt_##call[] = print; \
|
|
static struct ftrace_event_class __used event_class_##call = { \
|
|
.system = __stringify(TRACE_SYSTEM) \
|
|
};
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, call, proto, args) \
|
|
\
|
|
static struct ftrace_event_call __used \
|
|
__attribute__((__aligned__(4))) \
|
|
__attribute__((section("_ftrace_events"))) event_##call = { \
|
|
.name = #call, \
|
|
.class = &event_class_##template, \
|
|
.event = &ftrace_event_type_##call, \
|
|
.raw_init = trace_event_raw_init, \
|
|
.regfunc = ftrace_raw_reg_event_##call, \
|
|
.unregfunc = ftrace_raw_unreg_event_##call, \
|
|
.print_fmt = print_fmt_##template, \
|
|
.define_fields = ftrace_define_fields_##template, \
|
|
_TRACE_PERF_INIT(call) \
|
|
};
|
|
|
|
#undef DEFINE_EVENT_PRINT
|
|
#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
|
|
\
|
|
static const char print_fmt_##call[] = print; \
|
|
\
|
|
static struct ftrace_event_call __used \
|
|
__attribute__((__aligned__(4))) \
|
|
__attribute__((section("_ftrace_events"))) event_##call = { \
|
|
.name = #call, \
|
|
.class = &event_class_##template, \
|
|
.event = &ftrace_event_type_##call, \
|
|
.raw_init = trace_event_raw_init, \
|
|
.regfunc = ftrace_raw_reg_event_##call, \
|
|
.unregfunc = ftrace_raw_unreg_event_##call, \
|
|
.print_fmt = print_fmt_##call, \
|
|
.define_fields = ftrace_define_fields_##template, \
|
|
_TRACE_PERF_INIT(call) \
|
|
}
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/*
|
|
* Define the insertion callback to perf events
|
|
*
|
|
* The job is very similar to ftrace_raw_event_<call> except that we don't
|
|
* insert in the ring buffer but in a perf counter.
|
|
*
|
|
* static void ftrace_perf_<call>(proto)
|
|
* {
|
|
* struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
|
|
* struct ftrace_event_call *event_call = &event_<call>;
|
|
* extern void perf_tp_event(int, u64, u64, void *, int);
|
|
* struct ftrace_raw_##call *entry;
|
|
* struct perf_trace_buf *trace_buf;
|
|
* u64 __addr = 0, __count = 1;
|
|
* unsigned long irq_flags;
|
|
* struct trace_entry *ent;
|
|
* int __entry_size;
|
|
* int __data_size;
|
|
* int __cpu
|
|
* int pc;
|
|
*
|
|
* pc = preempt_count();
|
|
*
|
|
* __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
|
|
*
|
|
* // Below we want to get the aligned size by taking into account
|
|
* // the u32 field that will later store the buffer size
|
|
* __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
|
|
* sizeof(u64));
|
|
* __entry_size -= sizeof(u32);
|
|
*
|
|
* // Protect the non nmi buffer
|
|
* // This also protects the rcu read side
|
|
* local_irq_save(irq_flags);
|
|
* __cpu = smp_processor_id();
|
|
*
|
|
* if (in_nmi())
|
|
* trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
|
|
* else
|
|
* trace_buf = rcu_dereference_sched(perf_trace_buf);
|
|
*
|
|
* if (!trace_buf)
|
|
* goto end;
|
|
*
|
|
* trace_buf = per_cpu_ptr(trace_buf, __cpu);
|
|
*
|
|
* // Avoid recursion from perf that could mess up the buffer
|
|
* if (trace_buf->recursion++)
|
|
* goto end_recursion;
|
|
*
|
|
* raw_data = trace_buf->buf;
|
|
*
|
|
* // Make recursion update visible before entering perf_tp_event
|
|
* // so that we protect from perf recursions.
|
|
*
|
|
* barrier();
|
|
*
|
|
* //zero dead bytes from alignment to avoid stack leak to userspace:
|
|
* *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
|
|
* entry = (struct ftrace_raw_<call> *)raw_data;
|
|
* ent = &entry->ent;
|
|
* tracing_generic_entry_update(ent, irq_flags, pc);
|
|
* ent->type = event_call->id;
|
|
*
|
|
* <tstruct> <- do some jobs with dynamic arrays
|
|
*
|
|
* <assign> <- affect our values
|
|
*
|
|
* perf_tp_event(event_call->id, __addr, __count, entry,
|
|
* __entry_size); <- submit them to perf counter
|
|
*
|
|
* }
|
|
*/
|
|
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
|
|
#undef __entry
|
|
#define __entry entry
|
|
|
|
#undef __get_dynamic_array
|
|
#define __get_dynamic_array(field) \
|
|
((void *)__entry + (__entry->__data_loc_##field & 0xffff))
|
|
|
|
#undef __get_str
|
|
#define __get_str(field) (char *)__get_dynamic_array(field)
|
|
|
|
#undef __perf_addr
|
|
#define __perf_addr(a) __addr = (a)
|
|
|
|
#undef __perf_count
|
|
#define __perf_count(c) __count = (c)
|
|
|
|
#undef DECLARE_EVENT_CLASS
|
|
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
static notrace void \
|
|
perf_trace_templ_##call(struct ftrace_event_call *event_call, \
|
|
proto) \
|
|
{ \
|
|
struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
|
|
struct ftrace_raw_##call *entry; \
|
|
u64 __addr = 0, __count = 1; \
|
|
unsigned long irq_flags; \
|
|
struct pt_regs *__regs; \
|
|
int __entry_size; \
|
|
int __data_size; \
|
|
int rctx; \
|
|
\
|
|
__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
|
|
__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
|
|
sizeof(u64)); \
|
|
__entry_size -= sizeof(u32); \
|
|
\
|
|
if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE, \
|
|
"profile buffer not large enough")) \
|
|
return; \
|
|
entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare( \
|
|
__entry_size, event_call->id, &rctx, &irq_flags); \
|
|
if (!entry) \
|
|
return; \
|
|
tstruct \
|
|
\
|
|
{ assign; } \
|
|
\
|
|
__regs = &__get_cpu_var(perf_trace_regs); \
|
|
perf_fetch_caller_regs(__regs, 2); \
|
|
\
|
|
perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \
|
|
__count, irq_flags, __regs); \
|
|
}
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, call, proto, args) \
|
|
static notrace void perf_trace_##call(void *__ignore, proto) \
|
|
{ \
|
|
struct ftrace_event_call *event_call = &event_##call; \
|
|
\
|
|
perf_trace_templ_##template(event_call, args); \
|
|
}
|
|
|
|
#undef DEFINE_EVENT_PRINT
|
|
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
|
|
DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
#endif /* CONFIG_PERF_EVENTS */
|
|
|
|
#undef _TRACE_PROFILE_INIT
|
|
|