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-rw-r--r--include/asm-generic/vmlinux.lds.h5
-rw-r--r--include/linux/ftrace_event.h2
-rw-r--r--include/linux/tracepoint.h8
-rw-r--r--include/trace/ftrace.h22
-rw-r--r--kernel/trace/trace.c26
-rw-r--r--kernel/trace/trace.h2
-rw-r--r--kernel/trace/trace_events.c119
7 files changed, 178 insertions, 6 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index ac78910d7416..f8e8b34dc427 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -124,7 +124,10 @@
#define FTRACE_EVENTS() . = ALIGN(8); \
VMLINUX_SYMBOL(__start_ftrace_events) = .; \
*(_ftrace_events) \
- VMLINUX_SYMBOL(__stop_ftrace_events) = .;
+ VMLINUX_SYMBOL(__stop_ftrace_events) = .; \
+ VMLINUX_SYMBOL(__start_ftrace_enum_maps) = .; \
+ *(_ftrace_enum_map) \
+ VMLINUX_SYMBOL(__stop_ftrace_enum_maps) = .;
#else
#define FTRACE_EVENTS()
#endif
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index 62b8fac7ded5..112cf49d9576 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -285,7 +285,7 @@ struct ftrace_event_call {
struct tracepoint *tp;
};
struct trace_event event;
- const char *print_fmt;
+ char *print_fmt;
struct event_filter *filter;
void *mod;
void *data;
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index c72851328ca9..a5f7f3ecafa3 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -36,6 +36,12 @@ struct tracepoint {
struct tracepoint_func __rcu *funcs;
};
+struct trace_enum_map {
+ const char *system;
+ const char *enum_string;
+ unsigned long enum_value;
+};
+
extern int
tracepoint_probe_register(struct tracepoint *tp, void *probe, void *data);
extern int
@@ -87,6 +93,8 @@ extern void syscall_unregfunc(void);
#define PARAMS(args...) args
+#define TRACE_DEFINE_ENUM(x)
+
#endif /* _LINUX_TRACEPOINT_H */
/*
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 2f9b95b6d3fb..37d4b10b111d 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -33,6 +33,19 @@
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
@@ -136,6 +149,9 @@ TRACE_MAKE_SYSTEM_STR();
* 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)
@@ -553,7 +569,7 @@ static inline notrace int ftrace_get_offsets_##call( \
* .trace = ftrace_raw_output_<call>, <-- stage 2
* };
*
- * static const char print_fmt_<call>[] = <TP_printk>;
+ * static char print_fmt_<call>[] = <TP_printk>;
*
* static struct ftrace_event_class __used event_class_<template> = {
* .system = "<system>",
@@ -704,7 +720,7 @@ static inline void ftrace_test_probe_##call(void) \
#undef DECLARE_EVENT_CLASS
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
_TRACE_PERF_PROTO(call, PARAMS(proto)); \
-static const char print_fmt_##call[] = print; \
+static char print_fmt_##call[] = print; \
static struct ftrace_event_class __used __refdata event_class_##call = { \
.system = TRACE_SYSTEM_STRING, \
.define_fields = ftrace_define_fields_##call, \
@@ -733,7 +749,7 @@ __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
#undef DEFINE_EVENT_PRINT
#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
\
-static const char print_fmt_##call[] = print; \
+static char print_fmt_##call[] = print; \
\
static struct ftrace_event_call __used event_##call = { \
.class = &event_class_##template, \
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 62c6506d663f..ebf49649534c 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3908,6 +3908,20 @@ static const struct file_operations tracing_saved_cmdlines_size_fops = {
.write = tracing_saved_cmdlines_size_write,
};
+static void
+trace_insert_enum_map(struct trace_enum_map **start, struct trace_enum_map **stop)
+{
+ struct trace_enum_map **map;
+ int len = stop - start;
+
+ if (len <= 0)
+ return;
+
+ map = start;
+
+ trace_event_enum_update(map, len);
+}
+
static ssize_t
tracing_set_trace_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
@@ -6542,6 +6556,14 @@ struct dentry *tracing_init_dentry(void)
return tr->dir;
}
+extern struct trace_enum_map *__start_ftrace_enum_maps[];
+extern struct trace_enum_map *__stop_ftrace_enum_maps[];
+
+static void __init trace_enum_init(void)
+{
+ trace_insert_enum_map(__start_ftrace_enum_maps, __stop_ftrace_enum_maps);
+}
+
static __init int tracer_init_debugfs(void)
{
struct dentry *d_tracer;
@@ -6566,6 +6588,8 @@ static __init int tracer_init_debugfs(void)
trace_create_file("saved_cmdlines_size", 0644, d_tracer,
NULL, &tracing_saved_cmdlines_size_fops);
+ trace_enum_init();
+
#ifdef CONFIG_DYNAMIC_FTRACE
trace_create_file("dyn_ftrace_total_info", 0444, d_tracer,
&ftrace_update_tot_cnt, &tracing_dyn_info_fops);
@@ -6888,7 +6912,7 @@ void __init trace_init(void)
tracepoint_printk = 0;
}
tracer_alloc_buffers();
- trace_event_init();
+ trace_event_init();
}
__init static int clear_boot_tracer(void)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index dd8205a35760..b48d4b08f691 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1309,8 +1309,10 @@ static inline void init_ftrace_syscalls(void) { }
#ifdef CONFIG_EVENT_TRACING
void trace_event_init(void);
+void trace_event_enum_update(struct trace_enum_map **map, int len);
#else
static inline void __init trace_event_init(void) { }
+static inlin void trace_event_enum_update(struct trace_enum_map **map, int len) { }
#endif
extern struct trace_iterator *tracepoint_print_iter;
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index db54dda10ccc..fc58c50fbf01 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1704,6 +1704,125 @@ __register_event(struct ftrace_event_call *call, struct module *mod)
return 0;
}
+static char *enum_replace(char *ptr, struct trace_enum_map *map, int len)
+{
+ int rlen;
+ int elen;
+
+ /* Find the length of the enum value as a string */
+ elen = snprintf(ptr, 0, "%ld", map->enum_value);
+ /* Make sure there's enough room to replace the string with the value */
+ if (len < elen)
+ return NULL;
+
+ snprintf(ptr, elen + 1, "%ld", map->enum_value);
+
+ /* Get the rest of the string of ptr */
+ rlen = strlen(ptr + len);
+ memmove(ptr + elen, ptr + len, rlen);
+ /* Make sure we end the new string */
+ ptr[elen + rlen] = 0;
+
+ return ptr + elen;
+}
+
+static void update_event_printk(struct ftrace_event_call *call,
+ struct trace_enum_map *map)
+{
+ char *ptr;
+ int quote = 0;
+ int len = strlen(map->enum_string);
+
+ for (ptr = call->print_fmt; *ptr; ptr++) {
+ if (*ptr == '\\') {
+ ptr++;
+ /* paranoid */
+ if (!*ptr)
+ break;
+ continue;
+ }
+ if (*ptr == '"') {
+ quote ^= 1;
+ continue;
+ }
+ if (quote)
+ continue;
+ if (isdigit(*ptr)) {
+ /* skip numbers */
+ do {
+ ptr++;
+ /* Check for alpha chars like ULL */
+ } while (isalnum(*ptr));
+ /*
+ * A number must have some kind of delimiter after
+ * it, and we can ignore that too.
+ */
+ continue;
+ }
+ if (isalpha(*ptr) || *ptr == '_') {
+ if (strncmp(map->enum_string, ptr, len) == 0 &&
+ !isalnum(ptr[len]) && ptr[len] != '_') {
+ ptr = enum_replace(ptr, map, len);
+ /* Hmm, enum string smaller than value */
+ if (WARN_ON_ONCE(!ptr))
+ return;
+ /*
+ * No need to decrement here, as enum_replace()
+ * returns the pointer to the character passed
+ * the enum, and two enums can not be placed
+ * back to back without something in between.
+ * We can skip that something in between.
+ */
+ continue;
+ }
+ skip_more:
+ do {
+ ptr++;
+ } while (isalnum(*ptr) || *ptr == '_');
+ /*
+ * If what comes after this variable is a '.' or
+ * '->' then we can continue to ignore that string.
+ */
+ if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) {
+ ptr += *ptr == '.' ? 1 : 2;
+ goto skip_more;
+ }
+ /*
+ * Once again, we can skip the delimiter that came
+ * after the string.
+ */
+ continue;
+ }
+ }
+}
+
+void trace_event_enum_update(struct trace_enum_map **map, int len)
+{
+ struct ftrace_event_call *call, *p;
+ const char *last_system = NULL;
+ int last_i;
+ int i;
+
+ down_write(&trace_event_sem);
+ list_for_each_entry_safe(call, p, &ftrace_events, list) {
+ /* events are usually grouped together with systems */
+ if (!last_system || call->class->system != last_system) {
+ last_i = 0;
+ last_system = call->class->system;
+ }
+
+ for (i = last_i; i < len; i++) {
+ if (call->class->system == map[i]->system) {
+ /* Save the first system if need be */
+ if (!last_i)
+ last_i = i;
+ update_event_printk(call, map[i]);
+ }
+ }
+ }
+ up_write(&trace_event_sem);
+}
+
static struct ftrace_event_file *
trace_create_new_event(struct ftrace_event_call *call,
struct trace_array *tr)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-19 02:41:16 +0000