mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
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>
508 lines
14 KiB
C
508 lines
14 KiB
C
/*
|
|
* Stage 1 of the trace events.
|
|
*
|
|
* Override the macros in <trace/trace_events.h> to include the following:
|
|
*
|
|
* struct trace_event_raw_<call> {
|
|
* struct trace_entry ent;
|
|
* <type> <item>;
|
|
* <type2> <item2>[<len>];
|
|
* [...]
|
|
* };
|
|
*
|
|
* The <type> <item> is created by the __field(type, item) macro or
|
|
* the __array(type2, item2, len) macro.
|
|
* We simply do "type item;", and that will create the fields
|
|
* in the structure.
|
|
*/
|
|
|
|
#include <linux/trace_events.h>
|
|
|
|
#ifndef TRACE_SYSTEM_VAR
|
|
#define TRACE_SYSTEM_VAR TRACE_SYSTEM
|
|
#endif
|
|
|
|
#define __app__(x, y) str__##x##y
|
|
#define __app(x, y) __app__(x, y)
|
|
|
|
#define TRACE_SYSTEM_STRING __app(TRACE_SYSTEM_VAR,__trace_system_name)
|
|
|
|
#define TRACE_MAKE_SYSTEM_STR() \
|
|
static const char TRACE_SYSTEM_STRING[] = \
|
|
__stringify(TRACE_SYSTEM)
|
|
|
|
TRACE_MAKE_SYSTEM_STR();
|
|
|
|
#undef TRACE_DEFINE_ENUM
|
|
#define TRACE_DEFINE_ENUM(a) \
|
|
static struct trace_enum_map __used __initdata \
|
|
__##TRACE_SYSTEM##_##a = \
|
|
{ \
|
|
.system = TRACE_SYSTEM_STRING, \
|
|
.enum_string = #a, \
|
|
.enum_value = a \
|
|
}; \
|
|
static struct trace_enum_map __used \
|
|
__attribute__((section("_ftrace_enum_map"))) \
|
|
*TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
|
|
|
|
/*
|
|
* DECLARE_EVENT_CLASS can be used to add a generic function
|
|
* handlers for events. That is, if all events have the same
|
|
* parameters and just have distinct trace points.
|
|
* Each tracepoint can be defined with DEFINE_EVENT and that
|
|
* will map the DECLARE_EVENT_CLASS to the tracepoint.
|
|
*
|
|
* TRACE_EVENT is a one to one mapping between tracepoint and template.
|
|
*/
|
|
#undef TRACE_EVENT
|
|
#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
|
|
DECLARE_EVENT_CLASS(name, \
|
|
PARAMS(proto), \
|
|
PARAMS(args), \
|
|
PARAMS(tstruct), \
|
|
PARAMS(assign), \
|
|
PARAMS(print)); \
|
|
DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
|
|
|
|
|
|
#undef __field
|
|
#define __field(type, item) type item;
|
|
|
|
#undef __field_ext
|
|
#define __field_ext(type, item, filter_type) type item;
|
|
|
|
#undef __field_struct
|
|
#define __field_struct(type, item) type item;
|
|
|
|
#undef __field_struct_ext
|
|
#define __field_struct_ext(type, item, filter_type) type item;
|
|
|
|
#undef __array
|
|
#define __array(type, item, len) type item[len];
|
|
|
|
#undef __dynamic_array
|
|
#define __dynamic_array(type, item, len) u32 __data_loc_##item;
|
|
|
|
#undef __string
|
|
#define __string(item, src) __dynamic_array(char, item, -1)
|
|
|
|
#undef __bitmask
|
|
#define __bitmask(item, nr_bits) __dynamic_array(char, item, -1)
|
|
|
|
#undef TP_STRUCT__entry
|
|
#define TP_STRUCT__entry(args...) args
|
|
|
|
#undef DECLARE_EVENT_CLASS
|
|
#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
|
|
struct trace_event_raw_##name { \
|
|
struct trace_entry ent; \
|
|
tstruct \
|
|
char __data[0]; \
|
|
}; \
|
|
\
|
|
static struct trace_event_class event_class_##name;
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, name, proto, args) \
|
|
static struct trace_event_call __used \
|
|
__attribute__((__aligned__(4))) event_##name
|
|
|
|
#undef DEFINE_EVENT_FN
|
|
#define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg) \
|
|
DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
|
|
|
|
#undef DEFINE_EVENT_PRINT
|
|
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
|
|
DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
|
|
|
|
/* Callbacks are meaningless to ftrace. */
|
|
#undef TRACE_EVENT_FN
|
|
#define TRACE_EVENT_FN(name, proto, args, tstruct, \
|
|
assign, print, reg, unreg) \
|
|
TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
|
|
PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
|
|
|
|
#undef TRACE_EVENT_FLAGS
|
|
#define TRACE_EVENT_FLAGS(name, value) \
|
|
__TRACE_EVENT_FLAGS(name, value)
|
|
|
|
#undef TRACE_EVENT_PERF_PERM
|
|
#define TRACE_EVENT_PERF_PERM(name, expr...) \
|
|
__TRACE_EVENT_PERF_PERM(name, expr)
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/*
|
|
* Stage 2 of the trace events.
|
|
*
|
|
* Include the following:
|
|
*
|
|
* struct trace_event_data_offsets_<call> {
|
|
* u32 <item1>;
|
|
* u32 <item2>;
|
|
* [...]
|
|
* };
|
|
*
|
|
* The __dynamic_array() macro will create each u32 <item>, this is
|
|
* to keep the offset of each array from the beginning of the event.
|
|
* The size of an array is also encoded, in the higher 16 bits of <item>.
|
|
*/
|
|
|
|
#undef TRACE_DEFINE_ENUM
|
|
#define TRACE_DEFINE_ENUM(a)
|
|
|
|
#undef __field
|
|
#define __field(type, item)
|
|
|
|
#undef __field_ext
|
|
#define __field_ext(type, item, filter_type)
|
|
|
|
#undef __field_struct
|
|
#define __field_struct(type, item)
|
|
|
|
#undef __field_struct_ext
|
|
#define __field_struct_ext(type, item, filter_type)
|
|
|
|
#undef __array
|
|
#define __array(type, item, len)
|
|
|
|
#undef __dynamic_array
|
|
#define __dynamic_array(type, item, len) u32 item;
|
|
|
|
#undef __string
|
|
#define __string(item, src) __dynamic_array(char, item, -1)
|
|
|
|
#undef __bitmask
|
|
#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
|
|
|
|
#undef DECLARE_EVENT_CLASS
|
|
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
struct trace_event_data_offsets_##call { \
|
|
tstruct; \
|
|
};
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, name, proto, args)
|
|
|
|
#undef DEFINE_EVENT_PRINT
|
|
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
|
|
DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
|
|
|
|
#undef TRACE_EVENT_FLAGS
|
|
#define TRACE_EVENT_FLAGS(event, flag)
|
|
|
|
#undef TRACE_EVENT_PERF_PERM
|
|
#define TRACE_EVENT_PERF_PERM(event, expr...)
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
/*
|
|
* Stage 3 of the trace events.
|
|
*
|
|
* Override the macros in <trace/trace_events.h> to include the following:
|
|
*
|
|
* enum print_line_t
|
|
* trace_raw_output_<call>(struct trace_iterator *iter, int flags)
|
|
* {
|
|
* struct trace_seq *s = &iter->seq;
|
|
* struct trace_event_raw_<call> *field; <-- defined in stage 1
|
|
* struct trace_entry *entry;
|
|
* struct trace_seq *p = &iter->tmp_seq;
|
|
* int ret;
|
|
*
|
|
* entry = iter->ent;
|
|
*
|
|
* if (entry->type != event_<call>->event.type) {
|
|
* WARN_ON_ONCE(1);
|
|
* return TRACE_TYPE_UNHANDLED;
|
|
* }
|
|
*
|
|
* field = (typeof(field))entry;
|
|
*
|
|
* trace_seq_init(p);
|
|
* ret = trace_seq_printf(s, "%s: ", <call>);
|
|
* if (ret)
|
|
* ret = trace_seq_printf(s, <TP_printk> "\n");
|
|
* if (!ret)
|
|
* return TRACE_TYPE_PARTIAL_LINE;
|
|
*
|
|
* return TRACE_TYPE_HANDLED;
|
|
* }
|
|
*
|
|
* This is the method used to print the raw event to the trace
|
|
* output format. Note, this is not needed if the data is read
|
|
* in binary.
|
|
*/
|
|
|
|
#undef __entry
|
|
#define __entry field
|
|
|
|
#undef TP_printk
|
|
#define TP_printk(fmt, args...) fmt "\n", args
|
|
|
|
#undef __get_dynamic_array
|
|
#define __get_dynamic_array(field) \
|
|
((void *)__entry + (__entry->__data_loc_##field & 0xffff))
|
|
|
|
#undef __get_dynamic_array_len
|
|
#define __get_dynamic_array_len(field) \
|
|
((__entry->__data_loc_##field >> 16) & 0xffff)
|
|
|
|
#undef __get_str
|
|
#define __get_str(field) (char *)__get_dynamic_array(field)
|
|
|
|
#undef __get_bitmask
|
|
#define __get_bitmask(field) \
|
|
({ \
|
|
void *__bitmask = __get_dynamic_array(field); \
|
|
unsigned int __bitmask_size; \
|
|
__bitmask_size = __get_dynamic_array_len(field); \
|
|
trace_print_bitmask_seq(p, __bitmask, __bitmask_size); \
|
|
})
|
|
|
|
#undef __print_flags
|
|
#define __print_flags(flag, delim, flag_array...) \
|
|
({ \
|
|
static const struct trace_print_flags __flags[] = \
|
|
{ flag_array, { -1, NULL }}; \
|
|
trace_print_flags_seq(p, delim, flag, __flags); \
|
|
})
|
|
|
|
#undef __print_symbolic
|
|
#define __print_symbolic(value, symbol_array...) \
|
|
({ \
|
|
static const struct trace_print_flags symbols[] = \
|
|
{ symbol_array, { -1, NULL }}; \
|
|
trace_print_symbols_seq(p, value, symbols); \
|
|
})
|
|
|
|
#undef __print_symbolic_u64
|
|
#if BITS_PER_LONG == 32
|
|
#define __print_symbolic_u64(value, symbol_array...) \
|
|
({ \
|
|
static const struct trace_print_flags_u64 symbols[] = \
|
|
{ symbol_array, { -1, NULL } }; \
|
|
trace_print_symbols_seq_u64(p, value, symbols); \
|
|
})
|
|
#else
|
|
#define __print_symbolic_u64(value, symbol_array...) \
|
|
__print_symbolic(value, symbol_array)
|
|
#endif
|
|
|
|
#undef __print_hex
|
|
#define __print_hex(buf, buf_len) trace_print_hex_seq(p, buf, buf_len)
|
|
|
|
#undef __print_array
|
|
#define __print_array(array, count, el_size) \
|
|
({ \
|
|
BUILD_BUG_ON(el_size != 1 && el_size != 2 && \
|
|
el_size != 4 && el_size != 8); \
|
|
trace_print_array_seq(p, array, count, el_size); \
|
|
})
|
|
|
|
#undef DECLARE_EVENT_CLASS
|
|
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
static notrace enum print_line_t \
|
|
trace_raw_output_##call(struct trace_iterator *iter, int flags, \
|
|
struct trace_event *trace_event) \
|
|
{ \
|
|
struct trace_seq *s = &iter->seq; \
|
|
struct trace_seq __maybe_unused *p = &iter->tmp_seq; \
|
|
struct trace_event_raw_##call *field; \
|
|
int ret; \
|
|
\
|
|
field = (typeof(field))iter->ent; \
|
|
\
|
|
ret = trace_raw_output_prep(iter, trace_event); \
|
|
if (ret != TRACE_TYPE_HANDLED) \
|
|
return ret; \
|
|
\
|
|
trace_seq_printf(s, print); \
|
|
\
|
|
return trace_handle_return(s); \
|
|
} \
|
|
static struct trace_event_functions trace_event_type_funcs_##call = { \
|
|
.trace = trace_raw_output_##call, \
|
|
};
|
|
|
|
#undef DEFINE_EVENT_PRINT
|
|
#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
|
|
static notrace enum print_line_t \
|
|
trace_raw_output_##call(struct trace_iterator *iter, int flags, \
|
|
struct trace_event *event) \
|
|
{ \
|
|
struct trace_event_raw_##template *field; \
|
|
struct trace_entry *entry; \
|
|
struct trace_seq *p = &iter->tmp_seq; \
|
|
\
|
|
entry = iter->ent; \
|
|
\
|
|
if (entry->type != event_##call.event.type) { \
|
|
WARN_ON_ONCE(1); \
|
|
return TRACE_TYPE_UNHANDLED; \
|
|
} \
|
|
\
|
|
field = (typeof(field))entry; \
|
|
\
|
|
trace_seq_init(p); \
|
|
return trace_output_call(iter, #call, print); \
|
|
} \
|
|
static struct trace_event_functions trace_event_type_funcs_##call = { \
|
|
.trace = trace_raw_output_##call, \
|
|
};
|
|
|
|
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
|
|
|
|
#undef __field_ext
|
|
#define __field_ext(type, item, filter_type) \
|
|
ret = trace_define_field(event_call, #type, #item, \
|
|
offsetof(typeof(field), item), \
|
|
sizeof(field.item), \
|
|
is_signed_type(type), filter_type); \
|
|
if (ret) \
|
|
return ret;
|
|
|
|
#undef __field_struct_ext
|
|
#define __field_struct_ext(type, item, filter_type) \
|
|
ret = trace_define_field(event_call, #type, #item, \
|
|
offsetof(typeof(field), item), \
|
|
sizeof(field.item), \
|
|
0, filter_type); \
|
|
if (ret) \
|
|
return ret;
|
|
|
|
#undef __field
|
|
#define __field(type, item) __field_ext(type, item, FILTER_OTHER)
|
|
|
|
#undef __field_struct
|
|
#define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER)
|
|
|
|
#undef __array
|
|
#define __array(type, item, len) \
|
|
do { \
|
|
char *type_str = #type"["__stringify(len)"]"; \
|
|
BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
|
|
ret = trace_define_field(event_call, type_str, #item, \
|
|
offsetof(typeof(field), item), \
|
|
sizeof(field.item), \
|
|
is_signed_type(type), FILTER_OTHER); \
|
|
if (ret) \
|
|
return ret; \
|
|
} while (0);
|
|
|
|
#undef __dynamic_array
|
|
#define __dynamic_array(type, item, len) \
|
|
ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
|
|
offsetof(typeof(field), __data_loc_##item), \
|
|
sizeof(field.__data_loc_##item), \
|
|
is_signed_type(type), FILTER_OTHER);
|
|
|
|
#undef __string
|
|
#define __string(item, src) __dynamic_array(char, item, -1)
|
|
|
|
#undef __bitmask
|
|
#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
|
|
|
|
#undef DECLARE_EVENT_CLASS
|
|
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
|
|
static int notrace __init \
|
|
trace_event_define_fields_##call(struct trace_event_call *event_call) \
|
|
{ \
|
|
struct trace_event_raw_##call field; \
|
|
int ret; \
|
|
\
|
|
tstruct; \
|
|
\
|
|
return ret; \
|
|
}
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, name, proto, 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)
|
|
|
|
/*
|
|
* remember the offset of each array from the beginning of the event.
|
|
*/
|
|
|
|
#undef __entry
|
|
#define __entry entry
|
|
|
|
#undef __field
|
|
#define __field(type, item)
|
|
|
|
#undef __field_ext
|
|
#define __field_ext(type, item, filter_type)
|
|
|
|
#undef __field_struct
|
|
#define __field_struct(type, item)
|
|
|
|
#undef __field_struct_ext
|
|
#define __field_struct_ext(type, item, filter_type)
|
|
|
|
#undef __array
|
|
#define __array(type, item, len)
|
|
|
|
#undef __dynamic_array
|
|
#define __dynamic_array(type, item, len) \
|
|
__item_length = (len) * sizeof(type); \
|
|
__data_offsets->item = __data_size + \
|
|
offsetof(typeof(*entry), __data); \
|
|
__data_offsets->item |= __item_length << 16; \
|
|
__data_size += __item_length;
|
|
|
|
#undef __string
|
|
#define __string(item, src) __dynamic_array(char, item, \
|
|
strlen((src) ? (const char *)(src) : "(null)") + 1)
|
|
|
|
/*
|
|
* __bitmask_size_in_bytes_raw is the number of bytes needed to hold
|
|
* num_possible_cpus().
|
|
*/
|
|
#define __bitmask_size_in_bytes_raw(nr_bits) \
|
|
(((nr_bits) + 7) / 8)
|
|
|
|
#define __bitmask_size_in_longs(nr_bits) \
|
|
((__bitmask_size_in_bytes_raw(nr_bits) + \
|
|
((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
|
|
|
|
/*
|
|
* __bitmask_size_in_bytes is the number of bytes needed to hold
|
|
* num_possible_cpus() padded out to the nearest long. This is what
|
|
* is saved in the buffer, just to be consistent.
|
|
*/
|
|
#define __bitmask_size_in_bytes(nr_bits) \
|
|
(__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
|
|
|
|
#undef __bitmask
|
|
#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, \
|
|
__bitmask_size_in_longs(nr_bits))
|
|
|
|
#undef DECLARE_EVENT_CLASS
|
|
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
|
|
static inline notrace int trace_event_get_offsets_##call( \
|
|
struct trace_event_data_offsets_##call *__data_offsets, proto) \
|
|
{ \
|
|
int __data_size = 0; \
|
|
int __maybe_unused __item_length; \
|
|
struct trace_event_raw_##call __maybe_unused *entry; \
|
|
\
|
|
tstruct; \
|
|
\
|
|
return __data_size; \
|
|
}
|
|
|
|
#undef DEFINE_EVENT
|
|
#define DEFINE_EVENT(template, name, proto, 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)
|
|
|