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

[Takashi S. <o-t...@sa...>]

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-t...@sa...>
---
 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