linux-kernel - [PATCH 2/2] firewire: ohci: add tracepoints event for hardIRQ event

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Date: Tue, 25 Jun 2024 12:18:06 +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: ohci: add tracepoints event for hardIRQ event

1394 OHCI hardware triggers PCI interrupts to notify any events to
software. Current driver for the hardware is programmed by the typical
way to utilize top- and bottom- halves, thus it has a timing gap to handle
the notification in softIRQ (tasklet).

This commit adds a tracepoint event for the hardIRQ event. The comparison
of the tracepoint event to tracepoints events in firewire subsystem is
helpful to diagnose the timing gap.

Signed-off-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
---
 drivers/firewire/ohci.c              |  1 +
 include/trace/events/firewire_ohci.h | 33 +++++++++++++++++++++++++++-
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 07adb4ddd444..df16a8f4ee7f 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -2185,6 +2185,7 @@ static irqreturn_t irq_handler(int irq, void *data)
 	 */
 	reg_write(ohci, OHCI1394_IntEventClear,
 		  event & ~(OHCI1394_busReset | OHCI1394_postedWriteErr));
+	trace_irqs(ohci->card.index, event);
 	log_irqs(ohci, event);
 	// The flag is masked again at bus_reset_work() scheduled by selfID event.
 	if (event & OHCI1394_busReset)
diff --git a/include/trace/events/firewire_ohci.h b/include/trace/events/firewire_ohci.h
index 67fa3c1c8f6d..483aeeb033af 100644
--- a/include/trace/events/firewire_ohci.h
+++ b/include/trace/events/firewire_ohci.h
@@ -9,7 +9,38 @@
 
 #include <linux/tracepoint.h>
 
-// Placeholder for future use.
+TRACE_EVENT(irqs,
+	TP_PROTO(unsigned int card_index, u32 events),
+	TP_ARGS(card_index, events),
+	TP_STRUCT__entry(
+		__field(u8, card_index)
+		__field(u32, events)
+	),
+	TP_fast_assign(
+		__entry->card_index = card_index;
+		__entry->events = events;
+	),
+	TP_printk(
+		"card_index=%u events=%s",
+		__entry->card_index,
+		__print_flags(__entry->events, "|",
+			{ OHCI1394_selfIDComplete,	"selfIDComplete" },
+			{ OHCI1394_RQPkt,		"RQPkt" },
+			{ OHCI1394_RSPkt,		"RSPkt" },
+			{ OHCI1394_reqTxComplete,	"reqTxComplete" },
+			{ OHCI1394_respTxComplete,	"respTxComplete" },
+			{ OHCI1394_isochRx,		"isochRx" },
+			{ OHCI1394_isochTx,		"isochTx" },
+			{ OHCI1394_postedWriteErr,	"postedWriteErr" },
+			{ OHCI1394_cycleTooLong,	"cycleTooLong" },
+			{ OHCI1394_cycle64Seconds,	"cycle64Seconds" },
+			{ OHCI1394_cycleInconsistent,	"cycleInconsistent" },
+			{ OHCI1394_regAccessFail,	"regAccessFail" },
+			{ OHCI1394_unrecoverableError,	"unrecoverableError" },
+			{ OHCI1394_busReset,		"busReset" }
+		)
+	)
+);
 
 #endif // _FIREWIRE_OHCI_TRACE_EVENT_H
 
-- 
2.43.0