X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=probes%2Flttng-ftrace.c;h=fe1bfd6652ab837a0911b566b3c5dc6759d28043;hb=27e6eda75df97483d07d61ba731bbc428e2161f9;hp=d8523198e08db3edabe4276a1eb734ff7b1ce012;hpb=156a3977f8fa114924d7bbd2bd04c94fd2ac0649;p=lttng-modules.git

diff --git a/probes/lttng-ftrace.c b/probes/lttng-ftrace.c
index d8523198..fe1bfd66 100644
--- a/probes/lttng-ftrace.c
+++ b/probes/lttng-ftrace.c
@@ -1,23 +1,10 @@
-/*
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
  * probes/lttng-ftrace.c
  *
  * LTTng function tracer integration module.
  *
  * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
@@ -39,6 +26,45 @@
 #include <wrapper/vmalloc.h>
 #include <lttng-tracer.h>
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0))
+static
+void lttng_ftrace_handler(unsigned long ip, unsigned long parent_ip,
+		struct trace_array *tr, struct ftrace_probe_ops *ops,
+		void *data)
+{
+	struct lttng_event *event = data;
+	struct lttng_probe_ctx lttng_probe_ctx = {
+		.event = event,
+		.interruptible = !irqs_disabled(),
+	};
+	struct lttng_channel *chan = event->chan;
+	struct lib_ring_buffer_ctx ctx;
+	struct {
+		unsigned long ip;
+		unsigned long parent_ip;
+	} payload;
+	int ret;
+
+	if (unlikely(!READ_ONCE(chan->session->active)))
+		return;
+	if (unlikely(!READ_ONCE(chan->enabled)))
+		return;
+	if (unlikely(!READ_ONCE(event->enabled)))
+		return;
+
+	lib_ring_buffer_ctx_init(&ctx, chan->chan, &lttng_probe_ctx,
+				 sizeof(payload), lttng_alignof(payload), -1);
+	ret = chan->ops->event_reserve(&ctx, event->id);
+	if (ret < 0)
+		return;
+	payload.ip = ip;
+	payload.parent_ip = parent_ip;
+	lib_ring_buffer_align_ctx(&ctx, lttng_alignof(payload));
+	chan->ops->event_write(&ctx, &payload, sizeof(payload));
+	chan->ops->event_commit(&ctx);
+	return;
+}
+#else
 static
 void lttng_ftrace_handler(unsigned long ip, unsigned long parent_ip, void **data)
 {
@@ -55,11 +81,11 @@ void lttng_ftrace_handler(unsigned long ip, unsigned long parent_ip, void **data
 	} payload;
 	int ret;
 
-	if (unlikely(!ACCESS_ONCE(chan->session->active)))
+	if (unlikely(!READ_ONCE(chan->session->active)))
 		return;
-	if (unlikely(!ACCESS_ONCE(chan->enabled)))
+	if (unlikely(!READ_ONCE(chan->enabled)))
 		return;
-	if (unlikely(!ACCESS_ONCE(event->enabled)))
+	if (unlikely(!READ_ONCE(event->enabled)))
 		return;
 
 	lib_ring_buffer_ctx_init(&ctx, chan->chan, &lttng_probe_ctx,
@@ -74,6 +100,7 @@ void lttng_ftrace_handler(unsigned long ip, unsigned long parent_ip, void **data
 	chan->ops->event_commit(&ctx);
 	return;
 }
+#endif
 
 /*
  * Create event description
@@ -201,8 +228,8 @@ void lttng_ftrace_exit(void)
 module_exit(lttng_ftrace_exit)
 
 MODULE_LICENSE("GPL and additional rights");
-MODULE_AUTHOR("Mathieu Desnoyers");
-MODULE_DESCRIPTION("Linux Trace Toolkit Ftrace Support");
+MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
+MODULE_DESCRIPTION("LTTng ftrace probes");
 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
 	__stringify(LTTNG_MODULES_MINOR_VERSION) "."
 	__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)