linux-kernel - [RFC PATCH 09/13] firewire: core: add support for Linux kernel tracepoints

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Date: Thu, 18 Apr 2024 18:22:59 +0900
From: Takashi Sakamoto <o-takashi@...amocchi.jp>
To: linux1394-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org
Subject: [RFC PATCH 09/13] firewire: core: add support for Linux kernel tracepoints

The Linux Kernel Tracepoints framework is enough useful to trace
packet data inbound to and outbound from core.

This commit adds firewire subsystem to use the framework.

Signed-off-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
---
 drivers/firewire/Makefile |  5 ++++-
 drivers/firewire/trace.c  |  5 +++++
 drivers/firewire/trace.h  | 17 +++++++++++++++++
 3 files changed, 26 insertions(+), 1 deletion(-)
 create mode 100644 drivers/firewire/trace.c
 create mode 100644 drivers/firewire/trace.h

diff --git a/drivers/firewire/Makefile b/drivers/firewire/Makefile
index bbde29a0fba6..92376e045805 100644
--- a/drivers/firewire/Makefile
+++ b/drivers/firewire/Makefile
@@ -3,12 +3,15 @@
 # Makefile for the Linux IEEE 1394 implementation
 #
 
-firewire-core-y += core-card.o core-cdev.o core-device.o \
+firewire-core-y += trace.o core-card.o core-cdev.o core-device.o \
                    core-iso.o core-topology.o core-transaction.o
 firewire-ohci-y += ohci.o
 firewire-sbp2-y += sbp2.o
 firewire-net-y  += net.o
 
+# Let "include/trace/define_trace.h" find the header.
+CFLAGS_trace.o := -I$(src)
+
 obj-$(CONFIG_FIREWIRE)      += firewire-core.o
 obj-$(CONFIG_FIREWIRE_OHCI) += firewire-ohci.o
 obj-$(CONFIG_FIREWIRE_SBP2) += firewire-sbp2.o
diff --git a/drivers/firewire/trace.c b/drivers/firewire/trace.c
new file mode 100644
index 000000000000..ffe427764a90
--- /dev/null
+++ b/drivers/firewire/trace.c
@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// Copyright (c) 2024 Takashi Sakamoto
+
+#define CREATE_TRACE_POINTS
+#include "trace.h"
diff --git a/drivers/firewire/trace.h b/drivers/firewire/trace.h
new file mode 100644
index 000000000000..d36a10460301
--- /dev/null
+++ b/drivers/firewire/trace.h
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// Copyright (c) 2024 Takashi Sakamoto
+
+#define TRACE_SYSTEM	firewire
+
+#if !defined(_FIREWIRE_TRACE_EVENT_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _FIREWIRE_TRACE_EVENT_H
+
+#include <linux/tracepoint.h>
+
+// Placeholder for future use.
+
+#endif // _FIREWIRE_TRACE_EVENT_H
+
+#define TRACE_INCLUDE_PATH	.
+#define TRACE_INCLUDE_FILE	trace
+#include <trace/define_trace.h>
-- 
2.43.0