linux-kernel - [PATCH 2/7] firewire: core: add tracepoints events for setting channels of multichannel context

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Date: Mon, 24 Jun 2024 07:08:53 +0900
From: Takashi Sakamoto <o-takashi@...amocchi.jp>
To: linux1394-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 2/7] firewire: core: add tracepoints events for setting channels of multichannel context

It is helpful to trace the channel setting for the multichannel isochronous
context when the core function is requested it by both in-kernel unit
drivers and userspace applications.

This commit adds some tracepoints events for the aim.

Signed-off-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
---
 drivers/firewire/core-iso.c     |  2 ++
 include/trace/events/firewire.h | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c
index ddb999297c72..7ec84de846e6 100644
--- a/drivers/firewire/core-iso.c
+++ b/drivers/firewire/core-iso.c
@@ -177,6 +177,8 @@ EXPORT_SYMBOL(fw_iso_context_start);
 
 int fw_iso_context_set_channels(struct fw_iso_context *ctx, u64 *channels)
 {
+	trace_isoc_inbound_multiple_channels(ctx, *channels);
+
 	return ctx->card->driver->set_iso_channels(ctx, channels);
 }
 
diff --git a/include/trace/events/firewire.h b/include/trace/events/firewire.h
index 0cca1ef841f3..0334e02f9d94 100644
--- a/include/trace/events/firewire.h
+++ b/include/trace/events/firewire.h
@@ -541,6 +541,27 @@ DEFINE_EVENT_CONDITION(isoc_destroy_template, isoc_inbound_multiple_destroy,
 	TP_CONDITION(ctx->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL)
 );
 
+TRACE_EVENT(isoc_inbound_multiple_channels,
+	TP_PROTO(const struct fw_iso_context *ctx, u64 channels),
+	TP_ARGS(ctx, channels),
+	TP_STRUCT__entry(
+		__field(u64, context)
+		__field(u8, card_index)
+		__field(u64, channels)
+	),
+	TP_fast_assign(
+		__entry->context = (uintptr_t)ctx;
+		__entry->card_index = ctx->card->index;
+		__entry->channels = channels;
+	),
+	TP_printk(
+		"context=0x%llx card_index=%u channels=0x%016llx",
+		__entry->context,
+		__entry->card_index,
+		__entry->channels
+	)
+);
+
 #undef QUADLET_SIZE
 
 #endif // _FIREWIRE_TRACE_EVENT_H
-- 
2.43.0