linux-kernel - [PATCH v3 1/5] tracepoint: Support iterating over tracepoints on modules

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Message-Id: <172397777800.286558.14554748203446214056.stgit@devnote2>
Date: Sun, 18 Aug 2024 19:42:58 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	don <zds100@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	mhiramat@...nel.org
Subject: [PATCH v3 1/5] tracepoint: Support iterating over tracepoints on modules

From: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Add for_each_module_tracepoint() for iterating over tracepoints
on modules. This is similar to the for_each_kernel_tracepoint()
but only for the tracepoints on modules (not including kernel
built-in tracepoints).

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
 Changes in v3:
  - Add kerneldoc for for_each_module_tracepoint.
---
 include/linux/tracepoint.h |    7 +++++++
 kernel/tracepoint.c        |   21 +++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 6be396bb4297..837fcf8ec0d5 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -64,6 +64,8 @@ struct tp_module {
 bool trace_module_has_bad_taint(struct module *mod);
 extern int register_tracepoint_module_notifier(struct notifier_block *nb);
 extern int unregister_tracepoint_module_notifier(struct notifier_block *nb);
+void for_each_module_tracepoint(void (*fct)(struct tracepoint *, void *),
+				void *priv);
 #else
 static inline bool trace_module_has_bad_taint(struct module *mod)
 {
@@ -79,6 +81,11 @@ int unregister_tracepoint_module_notifier(struct notifier_block *nb)
 {
 	return 0;
 }
+static inline
+void for_each_module_tracepoint(void (*fct)(struct tracepoint *, void *),
+				void *priv)
+{
+}
 #endif /* CONFIG_MODULES */
 
 /*
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index 8d1507dd0724..bed4aad36d92 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -735,6 +735,27 @@ static __init int init_tracepoints(void)
 	return ret;
 }
 __initcall(init_tracepoints);
+
+/**
+ * for_each_module_tracepoint - iteration on all tracepoints in all modules
+ * @fct: callback
+ * @priv: private data
+ */
+void for_each_module_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
+				void *priv)
+{
+	struct tp_module *tp_mod;
+	struct module *mod;
+
+	mutex_lock(&tracepoint_module_list_mutex);
+	list_for_each_entry(tp_mod, &tracepoint_module_list, list) {
+		mod = tp_mod->mod;
+		for_each_tracepoint_range(mod->tracepoints_ptrs,
+			mod->tracepoints_ptrs + mod->num_tracepoints,
+			fct, priv);
+	}
+	mutex_unlock(&tracepoint_module_list_mutex);
+}
 #endif /* CONFIG_MODULES */
 
 /**