linux-kernel - [PATCH 2/2] firewire: core: add tracepoints event for asynchronous inbound phy packet

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Date: Tue, 30 Apr 2024 09:14:04 +0900
From: Takashi Sakamoto <o-takashi@...amocchi.jp>
To: linux1394-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] firewire: core: add tracepoints event for asynchronous inbound phy packet

At the former commit, a pair of tracepoints events is added to trace
asynchronous outbound phy packet. This commit adds a tracepoints event
to trace inbound phy packet. It includes transaction status as well as
the content of phy packet.

This is an example for Remote Reply Packet as a response to Remote Access
Packet sent by lsfirewirephy command in linux-firewire-utils:

async_phy_inbound: \
  packet=0xffff955fc02b4e10 generation=1 status=1 timestamp=0x0619 \
  first_quadlet=0x001c8208 second_quadlet=0xffe37df7

Signed-off-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
---
 drivers/firewire/core-transaction.c |  2 ++
 include/trace/events/firewire.h     | 30 +++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index a828b7167d15..d3eefbf23663 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -995,6 +995,8 @@ void fw_core_handle_request(struct fw_card *card, struct fw_packet *p)
 
 	tcode = async_header_get_tcode(p->header);
 	if (tcode_is_link_internal(tcode)) {
+		trace_async_phy_inbound((uintptr_t)p, p->generation, p->ack, p->timestamp,
+					 p->header[1], p->header[2]);
 		fw_cdev_handle_phy_packet(card, p);
 		return;
 	}
diff --git a/include/trace/events/firewire.h b/include/trace/events/firewire.h
index 3ade7d4b9268..db49b9828bd1 100644
--- a/include/trace/events/firewire.h
+++ b/include/trace/events/firewire.h
@@ -254,6 +254,36 @@ TRACE_EVENT(async_phy_outbound_complete,
 	)
 );
 
+TRACE_EVENT(async_phy_inbound,
+	TP_PROTO(u64 packet, unsigned int generation, unsigned int status, unsigned int timestamp, u32 first_quadlet, u32 second_quadlet),
+	TP_ARGS(packet, generation, status, timestamp, first_quadlet, second_quadlet),
+	TP_STRUCT__entry(
+		__field(u64, packet)
+		__field(u8, generation)
+		__field(u8, status)
+		__field(u16, timestamp)
+		__field(u32, first_quadlet)
+		__field(u32, second_quadlet)
+	),
+	TP_fast_assign(
+		__entry->packet = packet;
+		__entry->generation = generation;
+		__entry->status = status;
+		__entry->timestamp = timestamp;
+		__entry->first_quadlet = first_quadlet;
+		__entry->second_quadlet = second_quadlet
+	),
+	TP_printk(
+		"packet=0x%016llx generation=%u status=%u timestamp=0x%04x first_quadlet=0x%08x second_quadlet=0x%08x",
+		__entry->packet,
+		__entry->generation,
+		__entry->status,
+		__entry->timestamp,
+		__entry->first_quadlet,
+		__entry->second_quadlet
+	)
+);
+
 #endif // _FIREWIRE_TRACE_EVENT_H
 
 #include <trace/define_trace.h>
-- 
2.43.0