@@ -258,7 +258,8 @@
#define FTRACE_EVENTS() \
. = ALIGN(8); \
BOUNDED_SECTION(_ftrace_events) \
- BOUNDED_SECTION_BY(_ftrace_eval_map, _ftrace_eval_maps)
+ BOUNDED_SECTION_BY(_ftrace_eval_map, _ftrace_eval_maps) \
+ BOUNDED_SECTION(_ftrace_sym_defs)
#else
#define FTRACE_EVENTS()
#endif
@@ -524,6 +524,8 @@ struct module {
unsigned int num_trace_events;
struct trace_eval_map **trace_evals;
unsigned int num_trace_evals;
+ struct trace_sym_def **trace_sym_defs;
+ unsigned int num_trace_sym_defs;
#endif
#ifdef CONFIG_FTRACE_MCOUNT_RECORD
unsigned int num_ftrace_callsites;
@@ -27,6 +27,13 @@ const char *trace_print_flags_seq(struct trace_seq *p, const char *delim,
const char *trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
const struct trace_print_flags *symbol_array);
+const char *trace_print_sym_seq(struct trace_seq *p, unsigned long long val,
+ const char *(*lookup)(unsigned long long val));
+const char *trace_sym_lookup(const struct trace_sym_entry *list,
+ size_t len, unsigned long long value);
+void trace_sym_show(struct seq_file *m,
+ const struct trace_sym_entry *list, size_t len);
+
#if BITS_PER_LONG == 32
const char *trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
unsigned long long flags,
@@ -31,6 +31,24 @@ struct trace_eval_map {
unsigned long eval_value;
};
+struct trace_sym_def {
+ const char *system;
+ const char *symbol_id;
+ /* may return NULL, called under rcu_read_lock() */
+ const char * (*lookup)(unsigned long long);
+ /*
+ * Must print the list: ', { val, "name"}, ...'
+ * with no trailing comma, but with the leading ', '
+ * to simplify things:
+ */
+ void (*show)(struct seq_file *);
+};
+
+struct trace_sym_entry {
+ unsigned long long value;
+ const char *name;
+};
+
#define TRACEPOINT_DEFAULT_PRIO 10
extern struct srcu_struct tracepoint_srcu;
@@ -109,6 +127,8 @@ extern void syscall_unregfunc(void);
#define TRACE_DEFINE_ENUM(x)
#define TRACE_DEFINE_SIZEOF(x)
+#define TRACE_DEFINE_SYM_FNS(...)
+#define TRACE_DEFINE_SYM_LIST(...)
#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
@@ -23,6 +23,61 @@ TRACE_MAKE_SYSTEM_STR();
__section("_ftrace_eval_map") \
*TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
+/*
+ * Define a symbol for __print_sym by giving lookup and
+ * show functions. See &struct trace_sym_def.
+ */
+#undef TRACE_DEFINE_SYM_FNS
+#define TRACE_DEFINE_SYM_FNS(_symbol_id, _lookup, _show) \
+ _TRACE_DEFINE_SYM_FNS(TRACE_SYSTEM, _symbol_id, _lookup, _show)
+#define _TRACE_DEFINE_SYM_FNS(_system, _symbol_id, _lookup, _show) \
+ __TRACE_DEFINE_SYM_FNS(_system, _symbol_id, _lookup, _show)
+#define __TRACE_DEFINE_SYM_FNS(_system, _symbol_id, _lookup, _show) \
+ ___TRACE_DEFINE_SYM_FNS(_system ## _ ## _symbol_id, _symbol_id, \
+ _lookup, _show)
+#define ___TRACE_DEFINE_SYM_FNS(_name, _symbol_id, _lookup, _show) \
+ static struct trace_sym_def \
+ __trace_sym_def_ ## _name = { \
+ .system = TRACE_SYSTEM_STRING, \
+ .symbol_id = #_symbol_id, \
+ .lookup = _lookup, \
+ .show = _show, \
+ }; \
+ static struct trace_sym_def \
+ __section("_ftrace_sym_defs") \
+ *__trace_sym_def_p_ ## _name = &__trace_sym_def_ ## _name
+
+/*
+ * Define a symbol for __print_sym by giving lookup and
+ * show functions. See &struct trace_sym_def.
+ */
+#undef TRACE_DEFINE_SYM_LIST
+#define TRACE_DEFINE_SYM_LIST(_symbol_id, ...) \
+ _TRACE_DEFINE_SYM_LIST(TRACE_SYSTEM, _symbol_id, __VA_ARGS__)
+#define _TRACE_DEFINE_SYM_LIST(_system, _symbol_id, ...) \
+ __TRACE_DEFINE_SYM_LIST(_system, _symbol_id, __VA_ARGS__)
+#define __TRACE_DEFINE_SYM_LIST(_system, _symbol_id, ...) \
+ ___TRACE_DEFINE_SYM_LIST(_system ## _ ## _symbol_id, _symbol_id,\
+ __VA_ARGS__)
+#define ___TRACE_DEFINE_SYM_LIST(_name, _symbol_id, ...) \
+ static struct trace_sym_entry \
+ __trace_sym_list_ ## _name[] = { __VA_ARGS__ }; \
+ static const char * \
+ __trace_sym_lookup_ ## _name(unsigned long long value) \
+ { \
+ return trace_sym_lookup(__trace_sym_list_ ## _name, \
+ ARRAY_SIZE(__trace_sym_list_ ## _name), value); \
+ } \
+ static void \
+ __trace_sym_show_ ## _name(struct seq_file *m) \
+ { \
+ trace_sym_show(m, __trace_sym_list_ ## _name, \
+ ARRAY_SIZE(__trace_sym_list_ ## _name)); \
+ } \
+ ___TRACE_DEFINE_SYM_FNS(_name, _symbol_id, \
+ __trace_sym_lookup_ ## _name, \
+ __trace_sym_show_ ## _name)
+
#undef TRACE_DEFINE_SIZEOF
#define TRACE_DEFINE_SIZEOF(a) \
static struct trace_eval_map __used __initdata \
@@ -5,6 +5,12 @@
#undef TRACE_DEFINE_ENUM
#define TRACE_DEFINE_ENUM(a)
+#undef TRACE_DEFINE_SYM_FNS
+#define TRACE_DEFINE_SYM_FNS(_symbol_id, _lookup, _show)
+
+#undef TRACE_DEFINE_SYM_LIST
+#define TRACE_DEFINE_SYM_LIST(_symbol_id, ...)
+
#undef TRACE_DEFINE_SIZEOF
#define TRACE_DEFINE_SIZEOF(a)
@@ -79,6 +79,15 @@
trace_print_symbols_seq(p, value, symbols); \
})
+#undef __print_sym
+#define __print_sym(value, symbol_id) \
+ ___print_sym(TRACE_SYSTEM, value, symbol_id)
+#define ___print_sym(sys, value, symbol_id) \
+ ____print_sym(sys, value, symbol_id)
+#define ____print_sym(sys, value, symbol_id) \
+ trace_print_sym_seq(p, value, \
+ __trace_sym_def_p_ ## sys ## _ ## symbol_id->lookup)
+
#undef __print_flags_u64
#undef __print_symbolic_u64
#if BITS_PER_LONG == 32
@@ -25,6 +25,9 @@
#undef __print_hex_dump
#undef __get_buf
+#undef __print_sym
+#define __print_sym(value, symbol_id) __print_sym(value:symbol_id)
+
/*
* The below is not executed in the kernel. It is only what is
* displayed in the print format for userspace to parse.
@@ -2179,6 +2179,9 @@ static int find_module_sections(struct module *mod, struct load_info *info)
mod->trace_evals = section_objs(info, "_ftrace_eval_map",
sizeof(*mod->trace_evals),
&mod->num_trace_evals);
+ mod->trace_sym_defs = section_objs(info, "_ftrace_sym_defs",
+ sizeof(*mod->trace_sym_defs),
+ &mod->num_trace_sym_defs);
#endif
#ifdef CONFIG_TRACING
mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt",
@@ -1570,6 +1570,100 @@ static void *f_next(struct seq_file *m, void *v, loff_t *pos)
return node;
}
+extern struct trace_sym_def *__start_ftrace_sym_defs[];
+extern struct trace_sym_def *__stop_ftrace_sym_defs[];
+
+/* note: @name is not NUL-terminated */
+static void show_sym_list(struct seq_file *m, struct trace_event_call *call,
+ const char *name, unsigned int name_len)
+{
+ struct trace_sym_def **sym_defs;
+ unsigned int n_sym_defs, i;
+
+ if ((call->flags & TRACE_EVENT_FL_DYNAMIC) || !call->module) {
+ sym_defs = __start_ftrace_sym_defs;
+ n_sym_defs = __stop_ftrace_sym_defs - __start_ftrace_sym_defs;
+#ifdef CONFIG_MODULES
+ } else {
+ struct module *mod = call->module;
+
+ sym_defs = mod->trace_sym_defs;
+ n_sym_defs = mod->num_trace_sym_defs;
+#endif /* CONFIG_MODULES */
+ }
+
+ for (i = 0; i < n_sym_defs; i++) {
+ unsigned int sym_len;
+
+ if (!sym_defs[i])
+ continue;
+ if (sym_defs[i]->system != call->class->system)
+ continue;
+ sym_len = strlen(sym_defs[i]->symbol_id);
+ if (name_len != sym_len)
+ continue;
+ if (strncmp(sym_defs[i]->symbol_id, name, sym_len))
+ continue;
+ if (sym_defs[i]->show)
+ sym_defs[i]->show(m);
+ break;
+ }
+}
+
+static void show_print_fmt(struct seq_file *m, struct trace_event_call *call)
+{
+ char *ptr = call->print_fmt;
+ bool in_print_sym = false;
+ int quote = 0;
+
+ seq_puts(m, "\nprint fmt: ");
+ while (*ptr) {
+ if (*ptr == '\\') {
+ seq_putc(m, *ptr);
+ ptr++;
+ /* paranoid */
+ if (!*ptr)
+ break;
+ goto next;
+ }
+ if (*ptr == '"') {
+ quote ^= 1;
+ goto next;
+ }
+ if (quote)
+ goto next;
+
+ if (in_print_sym && *ptr != ':')
+ goto next;
+
+ if (in_print_sym && *ptr == ':') {
+ const char *name;
+
+ ptr++;
+ name = ptr;
+ /* skip the name */
+ while (*ptr && *ptr != ')')
+ ptr++;
+ /* and show the actual list inline now */
+ show_sym_list(m, call, name, ptr - name);
+ in_print_sym = false;
+ continue;
+ }
+
+ if (strncmp(ptr, "__print_sym(", 12) == 0) {
+ ptr += 12;
+ seq_puts(m, "__print_symbolic(");
+ in_print_sym = true;
+ continue;
+ }
+next:
+ seq_putc(m, *ptr);
+ ptr++;
+ }
+
+ seq_putc(m, '\n');
+}
+
static int f_show(struct seq_file *m, void *v)
{
struct trace_event_call *call = event_file_data(m->private);
@@ -1588,8 +1682,7 @@ static int f_show(struct seq_file *m, void *v)
return 0;
case FORMAT_PRINTFMT:
- seq_printf(m, "\nprint fmt: %s\n",
- call->print_fmt);
+ show_print_fmt(m, call);
return 0;
}
@@ -124,6 +124,51 @@ trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
}
EXPORT_SYMBOL(trace_print_symbols_seq);
+const char *trace_sym_lookup(const struct trace_sym_entry *list,
+ size_t len, unsigned long long value)
+{
+ size_t i;
+
+ for (i = 0; i < len; i++) {
+ if (list[i].value == value)
+ return list[i].name;
+ }
+ return NULL;
+}
+EXPORT_SYMBOL(trace_sym_lookup);
+
+void trace_sym_show(struct seq_file *m,
+ const struct trace_sym_entry *list, size_t len)
+{
+ size_t i;
+
+ for (i = 0; i < len; i++)
+ seq_printf(m, ", { %lld, \"%s\" }",
+ list[i].value, list[i].name);
+}
+EXPORT_SYMBOL(trace_sym_show);
+
+const char *
+trace_print_sym_seq(struct trace_seq *p, unsigned long long val,
+ const char *(*lookup)(unsigned long long val))
+{
+ const char *ret = trace_seq_buffer_ptr(p);
+ const char *name;
+
+ rcu_read_lock();
+ name = lookup(val);
+ if (name)
+ trace_seq_puts(p, name);
+ else
+ trace_seq_printf(p, "0x%llx", val);
+ rcu_read_unlock();
+
+ trace_seq_putc(p, 0);
+
+ return ret;
+}
+EXPORT_SYMBOL(trace_print_sym_seq);
+
#if BITS_PER_LONG == 32
const char *
trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,