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tracing: Add '__rel_loc' using trace event macros

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Add '__rel_loc' using trace event macros. These macros are usually
not used in the kernel, except for testing purpose.
This also add "rel_" variant of macros for dynamic_array string,
and bitmask.

Link: https://lkml.kernel.org/r/163757342119.510314.816029622439099016.stgit@devnote2

Cc: Beau Belgrave <beaub@linux.microsoft.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2021-11-22 18:30:21 +09:00 committed by Steven Rostedt (VMware)
parent 05770dd0ad
commit 55de2c0b56
4 changed files with 153 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
include/trace/bpf_probe.h
View File

@ -21,6 +21,22 @@
#undef __get_bitmask
#define __get_bitmask(field) (char *)__get_dynamic_array(field)
#undef __get_rel_dynamic_array
#define __get_rel_dynamic_array(field) \
((void *)(&__entry->__rel_loc_##field) + \
sizeof(__entry->__rel_loc_##field) + \
(__entry->__rel_loc_##field & 0xffff))
#undef __get_rel_dynamic_array_len
#define __get_rel_dynamic_array_len(field) \
((__entry->__rel_loc_##field >> 16) & 0xffff)
#undef __get_rel_str
#define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field))
#undef __get_rel_bitmask
#define __get_rel_bitmask(field) (char *)__get_rel_dynamic_array(field)
#undef __perf_count
#define __perf_count(c) (c)

16
include/trace/perf.h
View File

@ -21,6 +21,22 @@
#undef __get_bitmask
#define __get_bitmask(field) (char *)__get_dynamic_array(field)
#undef __get_rel_dynamic_array
#define __get_rel_dynamic_array(field) \
((void *)(&__entry->__rel_loc_##field) + \
sizeof(__entry->__rel_loc_##field) + \
(__entry->__rel_loc_##field & 0xffff))
#undef __get_rel_dynamic_array_len
#define __get_rel_dynamic_array_len(field) \
((__entry->__rel_loc_##field >> 16) & 0xffff)
#undef __get_rel_str
#define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field))
#undef __get_rel_bitmask
#define __get_rel_bitmask(field) (char *)__get_rel_dynamic_array(field)
#undef __perf_count
#define __perf_count(c) (__count = (c))

120
include/trace/trace_events.h
View File

@ -108,6 +108,18 @@ TRACE_MAKE_SYSTEM_STR();
#undef __bitmask
#define __bitmask(item, nr_bits) __dynamic_array(char, item, -1)
#undef __rel_dynamic_array
#define __rel_dynamic_array(type, item, len) u32 __rel_loc_##item;
#undef __rel_string
#define __rel_string(item, src) __rel_dynamic_array(char, item, -1)
#undef __rel_string_len
#define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1)
#undef __rel_bitmask
#define __rel_bitmask(item, nr_bits) __rel_dynamic_array(char, item, -1)
#undef TP_STRUCT__entry
#define TP_STRUCT__entry(args...) args
@ -200,11 +212,23 @@ TRACE_MAKE_SYSTEM_STR();
#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 __string_len
#define __string_len(item, src, len) __dynamic_array(char, item, -1)
#undef __bitmask
#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
#undef __rel_dynamic_array
#define __rel_dynamic_array(type, item, len) u32 item;
#undef __rel_string
#define __rel_string(item, src) __rel_dynamic_array(char, item, -1)
#undef __rel_string_len
#define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1)
#undef __rel_bitmask
#define __rel_bitmask(item, nr_bits) __rel_dynamic_array(unsigned long, item, -1)
#undef DECLARE_EVENT_CLASS
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
@ -293,6 +317,19 @@ TRACE_MAKE_SYSTEM_STR();
#undef __get_str
#define __get_str(field) ((char *)__get_dynamic_array(field))
#undef __get_rel_dynamic_array
#define __get_rel_dynamic_array(field) \
((void *)(&__entry->__rel_loc_##field) + \
sizeof(__entry->__rel_loc_##field) + \
(__entry->__rel_loc_##field & 0xffff))
#undef __get_rel_dynamic_array_len
#define __get_rel_dynamic_array_len(field) \
((__entry->__rel_loc_##field >> 16) & 0xffff)
#undef __get_rel_str
#define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field))
#undef __get_bitmask
#define __get_bitmask(field) \
({ \
@ -302,6 +339,15 @@ TRACE_MAKE_SYSTEM_STR();
trace_print_bitmask_seq(p, __bitmask, __bitmask_size); \
})
#undef __get_rel_bitmask
#define __get_rel_bitmask(field) \
({ \
void *__bitmask = __get_rel_dynamic_array(field); \
unsigned int __bitmask_size; \
__bitmask_size = __get_rel_dynamic_array_len(field); \
trace_print_bitmask_seq(p, __bitmask, __bitmask_size); \
})
#undef __print_flags
#define __print_flags(flag, delim, flag_array...) \
({ \
@ -471,6 +517,21 @@ static struct trace_event_functions trace_event_type_funcs_##call = { \
#undef __bitmask
#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
#undef __rel_dynamic_array
#define __rel_dynamic_array(_type, _item, _len) { \
.type = "__rel_loc " #_type "[]", .name = #_item, \
.size = 4, .align = 4, \
.is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER },
#undef __rel_string
#define __rel_string(item, src) __rel_dynamic_array(char, item, -1)
#undef __rel_string_len
#define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1)
#undef __rel_bitmask
#define __rel_bitmask(item, nr_bits) __rel_dynamic_array(unsigned long, item, -1)
#undef DECLARE_EVENT_CLASS
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
static struct trace_event_fields trace_event_fields_##call[] = { \
@ -519,6 +580,22 @@ static struct trace_event_fields trace_event_fields_##call[] = { \
#undef __string_len
#define __string_len(item, src, len) __dynamic_array(char, item, (len) + 1)
#undef __rel_dynamic_array
#define __rel_dynamic_array(type, item, len) \
__item_length = (len) * sizeof(type); \
__data_offsets->item = __data_size + \
offsetof(typeof(*entry), __data) - \
offsetof(typeof(*entry), __rel_loc_##item) - \
sizeof(u32); \
__data_offsets->item |= __item_length << 16; \
__data_size += __item_length;
#undef __rel_string
#define __rel_string(item, src) __rel_dynamic_array(char, item, \
strlen((src) ? (const char *)(src) : "(null)") + 1)
#undef __rel_string_len
#define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, (len) + 1)
/*
* __bitmask_size_in_bytes_raw is the number of bytes needed to hold
* num_possible_cpus().
@ -542,6 +619,10 @@ static struct trace_event_fields trace_event_fields_##call[] = { \
#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, \
__bitmask_size_in_longs(nr_bits))
#undef __rel_bitmask
#define __rel_bitmask(item, nr_bits) __rel_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( \
@ -706,6 +787,37 @@ static inline notrace int trace_event_get_offsets_##call( \
#define __assign_bitmask(dst, src, nr_bits) \
memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
#undef __rel_dynamic_array
#define __rel_dynamic_array(type, item, len) \
__entry->__rel_loc_##item = __data_offsets.item;
#undef __rel_string
#define __rel_string(item, src) __rel_dynamic_array(char, item, -1)
#undef __rel_string_len
#define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1)
#undef __assign_rel_str
#define __assign_rel_str(dst, src) \
strcpy(__get_rel_str(dst), (src) ? (const char *)(src) : "(null)");
#undef __assign_rel_str_len
#define __assign_rel_str_len(dst, src, len) \
do { \
memcpy(__get_rel_str(dst), (src), (len)); \
__get_rel_str(dst)[len] = '\0'; \
} while (0)
#undef __rel_bitmask
#define __rel_bitmask(item, nr_bits) __rel_dynamic_array(unsigned long, item, -1)
#undef __get_rel_bitmask
#define __get_rel_bitmask(field) (char *)__get_rel_dynamic_array(field)
#undef __assign_rel_bitmask
#define __assign_rel_bitmask(dst, src, nr_bits) \
memcpy(__get_rel_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
#undef TP_fast_assign
#define TP_fast_assign(args...) args
@ -770,6 +882,10 @@ static inline void ftrace_test_probe_##call(void) \
#undef __get_dynamic_array_len
#undef __get_str
#undef __get_bitmask
#undef __get_rel_dynamic_array
#undef __get_rel_dynamic_array_len
#undef __get_rel_str
#undef __get_rel_bitmask
#undef __print_array
#undef __print_hex_dump

3
kernel/trace/trace.h
View File

@ -83,6 +83,9 @@ enum trace_type {
#undef __dynamic_array
#define __dynamic_array(type, item) type item[];
#undef __rel_dynamic_array
#define __rel_dynamic_array(type, item) type item[];
#undef F_STRUCT
#define F_STRUCT(args...) args