linux-kernel - [PATCH] firewire: core: record card index in tracepoints event for self ID sequence

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Date: Fri, 14 Jun 2024 09:42:51 +0900
From: Takashi Sakamoto <o-takashi@...amocchi.jp>
To: linux1394-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH] firewire: core: record card index in tracepoints event for self ID sequence

This patch is for for-next branch.

The selfIDComplete event occurs in the bus managed by one of 1394 OHCI
controller in Linux system, while the existing tracepoints events has
the lack of data about it to distinguish the issued hardware from the
others.

This commit adds card_index member into event structure to store the index
of host controller in use, and prints it.

Signed-off-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
---
 drivers/firewire/core-topology.c | 2 +-
 include/trace/events/firewire.h  | 9 ++++++---
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/firewire/core-topology.c b/drivers/firewire/core-topology.c
index 4a0b273392ab..a347e2f5482c 100644
--- a/drivers/firewire/core-topology.c
+++ b/drivers/firewire/core-topology.c
@@ -140,7 +140,7 @@ static struct fw_node *build_tree(struct fw_card *card, const u32 *sid, int self
 		}
 
 		port_capacity = self_id_sequence_get_port_capacity(quadlet_count);
-		trace_self_id_sequence(self_id_sequence, quadlet_count, generation);
+		trace_self_id_sequence(card->index, self_id_sequence, quadlet_count, generation);
 
 		for (port_index = 0; port_index < port_capacity; ++port_index) {
 			port_status = self_id_sequence_get_port_status(self_id_sequence, quadlet_count,
diff --git a/include/trace/events/firewire.h b/include/trace/events/firewire.h
index 4761b700ff84..ace95d38c6ea 100644
--- a/include/trace/events/firewire.h
+++ b/include/trace/events/firewire.h
@@ -370,14 +370,16 @@ void copy_port_status(u8 *port_status, unsigned int port_capacity, const u32 *se
 		      unsigned int quadlet_count);
 
 TRACE_EVENT(self_id_sequence,
-	TP_PROTO(const u32 *self_id_sequence, unsigned int quadlet_count, unsigned int generation),
-	TP_ARGS(self_id_sequence, quadlet_count, generation),
+	TP_PROTO(unsigned int card_index, const u32 *self_id_sequence, unsigned int quadlet_count, unsigned int generation),
+	TP_ARGS(card_index, self_id_sequence, quadlet_count, generation),
 	TP_STRUCT__entry(
+		__field(u8, card_index)
 		__field(u8, generation)
 		__dynamic_array(u8, port_status, self_id_sequence_get_port_capacity(quadlet_count))
 		__dynamic_array(u32, self_id_sequence, quadlet_count)
 	),
 	TP_fast_assign(
+		__entry->card_index = card_index;
 		__entry->generation = generation;
 		copy_port_status(__get_dynamic_array(port_status), __get_dynamic_array_len(port_status),
 				 self_id_sequence, quadlet_count);
@@ -385,7 +387,8 @@ TRACE_EVENT(self_id_sequence,
 					   __get_dynamic_array_len(self_id_sequence));
 	),
 	TP_printk(
-		"generation=%u phy_id=0x%02x link_active=%s gap_count=%u scode=%u contender=%s power_class=%u initiated_reset=%s port_status=%s self_id_sequence=%s",
+		"card_index=%u generation=%u phy_id=0x%02x link_active=%s gap_count=%u scode=%u contender=%s power_class=%u initiated_reset=%s port_status=%s self_id_sequence=%s",
+		__entry->card_index,
 		__entry->generation,
 		PHY_PACKET_SELF_ID_GET_PHY_ID(__get_dynamic_array(self_id_sequence)),
 		PHY_PACKET_SELF_ID_GET_LINK_ACTIVE(__get_dynamic_array(self_id_sequence)) ? "true" : "false",
-- 
2.43.0