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-rw-r--r--include/trace/ftrace.h340
1 files changed, 273 insertions, 67 deletions
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index cc0d9667e18..d1b3de9c1a7 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -18,6 +18,26 @@
#include <linux/ftrace_event.h>
+/*
+ * 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;
@@ -36,15 +56,21 @@
#undef TP_STRUCT__entry
#define TP_STRUCT__entry(args...) args
-#undef TRACE_EVENT
-#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
- struct ftrace_raw_##name { \
- struct trace_entry ent; \
- tstruct \
- char __data[0]; \
- }; \
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
+ struct ftrace_raw_##name { \
+ struct trace_entry ent; \
+ tstruct \
+ char __data[0]; \
+ };
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(template, name, proto, args) \
static struct ftrace_event_call event_##name
+#undef DEFINE_EVENT_PRINT
+#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
+ DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
+
#undef __cpparg
#define __cpparg(arg...) arg
@@ -89,12 +115,19 @@
#undef __string
#define __string(item, src) __dynamic_array(char, item, -1)
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
struct ftrace_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))
+
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
/*
@@ -120,9 +153,10 @@
#undef __field
#define __field(type, item) \
ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \
- "offset:%u;\tsize:%u;\n", \
+ "offset:%u;\tsize:%u;\tsigned:%u;\n", \
(unsigned int)offsetof(typeof(field), item), \
- (unsigned int)sizeof(field.item)); \
+ (unsigned int)sizeof(field.item), \
+ (unsigned int)is_signed_type(type)); \
if (!ret) \
return 0;
@@ -132,19 +166,21 @@
#undef __array
#define __array(type, item, len) \
ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \
- "offset:%u;\tsize:%u;\n", \
+ "offset:%u;\tsize:%u;\tsigned:%u;\n", \
(unsigned int)offsetof(typeof(field), item), \
- (unsigned int)sizeof(field.item)); \
+ (unsigned int)sizeof(field.item), \
+ (unsigned int)is_signed_type(type)); \
if (!ret) \
return 0;
#undef __dynamic_array
#define __dynamic_array(type, item, len) \
ret = trace_seq_printf(s, "\tfield:__data_loc " #type "[] " #item ";\t"\
- "offset:%u;\tsize:%u;\n", \
+ "offset:%u;\tsize:%u;\tsigned:%u;\n", \
(unsigned int)offsetof(typeof(field), \
__data_loc_##item), \
- (unsigned int)sizeof(field.__data_loc_##item)); \
+ (unsigned int)sizeof(field.__data_loc_##item), \
+ (unsigned int)is_signed_type(type)); \
if (!ret) \
return 0;
@@ -159,7 +195,7 @@
#undef __get_str
#undef TP_printk
-#define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
+#define TP_printk(fmt, args...) "\"%s\", %s\n", fmt, __stringify(args)
#undef TP_fast_assign
#define TP_fast_assign(args...) args
@@ -167,17 +203,50 @@
#undef TP_perf_assign
#define TP_perf_assign(args...)
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
static int \
-ftrace_format_##call(struct ftrace_event_call *unused, \
- struct trace_seq *s) \
+ftrace_format_setup_##call(struct ftrace_event_call *unused, \
+ struct trace_seq *s) \
{ \
struct ftrace_raw_##call field __attribute__((unused)); \
int ret = 0; \
\
tstruct; \
\
+ return ret; \
+} \
+ \
+static int \
+ftrace_format_##call(struct ftrace_event_call *unused, \
+ struct trace_seq *s) \
+{ \
+ int ret = 0; \
+ \
+ ret = ftrace_format_setup_##call(unused, s); \
+ if (!ret) \
+ return ret; \
+ \
+ ret = trace_seq_printf(s, "\nprint fmt: " print); \
+ \
+ 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) \
+static int \
+ftrace_format_##name(struct ftrace_event_call *unused, \
+ struct trace_seq *s) \
+{ \
+ int ret = 0; \
+ \
+ ret = ftrace_format_setup_##template(unused, s); \
+ if (!ret) \
+ return ret; \
+ \
trace_seq_printf(s, "\nprint fmt: " print); \
\
return ret; \
@@ -252,10 +321,11 @@ ftrace_format_##call(struct ftrace_event_call *unused, \
ftrace_print_symbols_seq(p, value, symbols); \
})
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
static enum print_line_t \
-ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
+ftrace_raw_output_id_##call(int event_id, const char *name, \
+ struct trace_iterator *iter, int flags) \
{ \
struct trace_seq *s = &iter->seq; \
struct ftrace_raw_##call *field; \
@@ -265,6 +335,47 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
\
entry = iter->ent; \
\
+ if (entry->type != event_id) { \
+ WARN_ON_ONCE(1); \
+ return TRACE_TYPE_UNHANDLED; \
+ } \
+ \
+ field = (typeof(field))entry; \
+ \
+ p = &get_cpu_var(ftrace_event_seq); \
+ trace_seq_init(p); \
+ ret = trace_seq_printf(s, "%s: ", name); \
+ if (ret) \
+ ret = trace_seq_printf(s, print); \
+ put_cpu(); \
+ if (!ret) \
+ return TRACE_TYPE_PARTIAL_LINE; \
+ \
+ return TRACE_TYPE_HANDLED; \
+}
+
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(template, name, proto, args) \
+static enum print_line_t \
+ftrace_raw_output_##name(struct trace_iterator *iter, int flags) \
+{ \
+ return ftrace_raw_output_id_##template(event_##name.id, \
+ #name, iter, flags); \
+}
+
+#undef DEFINE_EVENT_PRINT
+#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
+static enum print_line_t \
+ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
+{ \
+ struct trace_seq *s = &iter->seq; \
+ struct ftrace_raw_##template *field; \
+ struct trace_entry *entry; \
+ struct trace_seq *p; \
+ int ret; \
+ \
+ entry = iter->ent; \
+ \
if (entry->type != event_##call.id) { \
WARN_ON_ONCE(1); \
return TRACE_TYPE_UNHANDLED; \
@@ -274,14 +385,16 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
\
p = &get_cpu_var(ftrace_event_seq); \
trace_seq_init(p); \
- ret = trace_seq_printf(s, #call ": " print); \
+ ret = trace_seq_printf(s, "%s: ", #call); \
+ if (ret) \
+ ret = trace_seq_printf(s, print); \
put_cpu(); \
if (!ret) \
return TRACE_TYPE_PARTIAL_LINE; \
\
return TRACE_TYPE_HANDLED; \
}
-
+
#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
#undef __field_ext
@@ -315,8 +428,8 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
#undef __string
#define __string(item, src) __dynamic_array(char, item, -1)
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
static int \
ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
{ \
@@ -332,6 +445,13 @@ ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
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)
/*
@@ -358,10 +478,10 @@ ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
__data_size += (len) * sizeof(type);
#undef __string
-#define __string(item, src) __dynamic_array(char, item, strlen(src) + 1) \
+#define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
static inline int ftrace_get_offsets_##call( \
struct ftrace_data_offsets_##call *__data_offsets, proto) \
{ \
@@ -373,6 +493,13 @@ static inline int ftrace_get_offsets_##call( \
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)
#ifdef CONFIG_EVENT_PROFILE
@@ -394,21 +521,28 @@ static inline int ftrace_get_offsets_##call( \
*
*/
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)
+
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(template, name, proto, args) \
\
-static void ftrace_profile_##call(proto); \
+static void ftrace_profile_##name(proto); \
\
-static int ftrace_profile_enable_##call(void) \
+static int ftrace_profile_enable_##name(struct ftrace_event_call *unused)\
{ \
- return register_trace_##call(ftrace_profile_##call); \
+ return register_trace_##name(ftrace_profile_##name); \
} \
\
-static void ftrace_profile_disable_##call(void) \
+static void ftrace_profile_disable_##name(struct ftrace_event_call *unused)\
{ \
- unregister_trace_##call(ftrace_profile_##call); \
+ unregister_trace_##name(ftrace_profile_##name); \
}
+#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
@@ -423,7 +557,7 @@ static void ftrace_profile_disable_##call(void) \
* event_trace_printk(_RET_IP_, "<call>: " <fmt>);
* }
*
- * static int ftrace_reg_event_<call>(void)
+ * static int ftrace_reg_event_<call>(struct ftrace_event_call *unused)
* {
* int ret;
*
@@ -434,7 +568,7 @@ static void ftrace_profile_disable_##call(void) \
* return ret;
* }
*
- * static void ftrace_unreg_event_<call>(void)
+ * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
* {
* unregister_trace_<call>(ftrace_event_<call>);
* }
@@ -469,7 +603,7 @@ static void ftrace_profile_disable_##call(void) \
* trace_current_buffer_unlock_commit(buffer, event, irq_flags, pc);
* }
*
- * static int ftrace_raw_reg_event_<call>(void)
+ * static int ftrace_raw_reg_event_<call>(struct ftrace_event_call *unused)
* {
* int ret;
*
@@ -480,7 +614,7 @@ static void ftrace_profile_disable_##call(void) \
* return ret;
* }
*
- * static void ftrace_unreg_event_<call>(void)
+ * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
* {
* unregister_trace_<call>(ftrace_raw_event_<call>);
* }
@@ -489,7 +623,7 @@ static void ftrace_profile_disable_##call(void) \
* .trace = ftrace_raw_output_<call>, <-- stage 2
* };
*
- * static int ftrace_raw_init_event_<call>(void)
+ * static int ftrace_raw_init_event_<call>(struct ftrace_event_call *unused)
* {
* int id;
*
@@ -547,15 +681,13 @@ static void ftrace_profile_disable_##call(void) \
#define __assign_str(dst, src) \
strcpy(__get_str(dst), src);
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
\
-static struct ftrace_event_call event_##call; \
- \
-static void ftrace_raw_event_##call(proto) \
+static void ftrace_raw_event_id_##call(struct ftrace_event_call *event_call, \
+ proto) \
{ \
struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
- struct ftrace_event_call *event_call = &event_##call; \
struct ring_buffer_event *event; \
struct ftrace_raw_##call *entry; \
struct ring_buffer *buffer; \
@@ -569,7 +701,7 @@ static void ftrace_raw_event_##call(proto) \
__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
\
event = trace_current_buffer_lock_reserve(&buffer, \
- event_##call.id, \
+ event_call->id, \
sizeof(*entry) + __data_size, \
irq_flags, pc); \
if (!event) \
@@ -584,9 +716,17 @@ static void ftrace_raw_event_##call(proto) \
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 void ftrace_raw_event_##call(proto) \
+{ \
+ ftrace_raw_event_id_##template(&event_##call, args); \
} \
\
-static int ftrace_raw_reg_event_##call(void *ptr) \
+static int ftrace_raw_reg_event_##call(struct ftrace_event_call *unused)\
{ \
int ret; \
\
@@ -597,7 +737,7 @@ static int ftrace_raw_reg_event_##call(void *ptr) \
return ret; \
} \
\
-static void ftrace_raw_unreg_event_##call(void *ptr) \
+static void ftrace_raw_unreg_event_##call(struct ftrace_event_call *unused)\
{ \
unregister_trace_##call(ftrace_raw_event_##call); \
} \
@@ -606,7 +746,7 @@ static struct trace_event ftrace_event_type_##call = { \
.trace = ftrace_raw_output_##call, \
}; \
\
-static int ftrace_raw_init_event_##call(void) \
+static int ftrace_raw_init_event_##call(struct ftrace_event_call *unused)\
{ \
int id; \
\
@@ -616,7 +756,36 @@ static int ftrace_raw_init_event_##call(void) \
event_##call.id = id; \
INIT_LIST_HEAD(&event_##call.fields); \
return 0; \
-} \
+}
+
+#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 DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)
+
+#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, \
+ .system = __stringify(TRACE_SYSTEM), \
+ .event = &ftrace_event_type_##call, \
+ .raw_init = ftrace_raw_init_event_##call, \
+ .regfunc = ftrace_raw_reg_event_##call, \
+ .unregfunc = ftrace_raw_unreg_event_##call, \
+ .show_format = ftrace_format_##template, \
+ .define_fields = ftrace_define_fields_##template, \
+ _TRACE_PROFILE_INIT(call) \
+}
+
+#undef DEFINE_EVENT_PRINT
+#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
\
static struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
@@ -628,7 +797,7 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
.regfunc = ftrace_raw_reg_event_##call, \
.unregfunc = ftrace_raw_unreg_event_##call, \
.show_format = ftrace_format_##call, \
- .define_fields = ftrace_define_fields_##call, \
+ .define_fields = ftrace_define_fields_##template, \
_TRACE_PROFILE_INIT(call) \
}
@@ -646,6 +815,7 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
* 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;
@@ -670,14 +840,25 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
* __cpu = smp_processor_id();
*
* if (in_nmi())
- * raw_data = rcu_dereference(trace_profile_buf_nmi);
+ * trace_buf = rcu_dereference(perf_trace_buf_nmi);
* else
- * raw_data = rcu_dereference(trace_profile_buf);
+ * trace_buf = rcu_dereference(perf_trace_buf);
*
- * if (!raw_data)
+ * if (!trace_buf)
* goto end;
*
- * raw_data = per_cpu_ptr(raw_data, __cpu);
+ * 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;
@@ -704,21 +885,26 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
#undef __perf_count
#define __perf_count(c) __count = (c)
-#undef TRACE_EVENT
-#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
-static void ftrace_profile_##call(proto) \
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
+static void \
+ftrace_profile_templ_##call(struct ftrace_event_call *event_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); \
+ extern int perf_swevent_get_recursion_context(void); \
+ extern void perf_swevent_put_recursion_context(int rctx); \
+ extern void perf_tp_event(int, u64, u64, void *, int); \
struct ftrace_raw_##call *entry; \
u64 __addr = 0, __count = 1; \
unsigned long irq_flags; \
struct trace_entry *ent; \
int __entry_size; \
int __data_size; \
+ char *trace_buf; \
char *raw_data; \
int __cpu; \
+ int rctx; \
int pc; \
\
pc = preempt_count(); \
@@ -733,17 +919,22 @@ static void ftrace_profile_##call(proto) \
return; \
\
local_irq_save(irq_flags); \
+ \
+ rctx = perf_swevent_get_recursion_context(); \
+ if (rctx < 0) \
+ goto end_recursion; \
+ \
__cpu = smp_processor_id(); \
\
if (in_nmi()) \
- raw_data = rcu_dereference(trace_profile_buf_nmi); \
+ trace_buf = rcu_dereference(perf_trace_buf_nmi); \
else \
- raw_data = rcu_dereference(trace_profile_buf); \
+ trace_buf = rcu_dereference(perf_trace_buf); \
\
- if (!raw_data) \
+ if (!trace_buf) \
goto end; \
\
- raw_data = per_cpu_ptr(raw_data, __cpu); \
+ raw_data = per_cpu_ptr(trace_buf, __cpu); \
\
*(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL; \
entry = (struct ftrace_raw_##call *)raw_data; \
@@ -759,10 +950,25 @@ static void ftrace_profile_##call(proto) \
__entry_size); \
\
end: \
+ perf_swevent_put_recursion_context(rctx); \
+end_recursion: \
local_irq_restore(irq_flags); \
\
}
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(template, call, proto, args) \
+static void ftrace_profile_##call(proto) \
+{ \
+ struct ftrace_event_call *event_call = &event_##call; \
+ \
+ ftrace_profile_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_EVENT_PROFILE */