firewire: core: add tracepoints events for flushing completions of isochronous context

It is helpful to trace the flushing completions of isochronous context when
the core function is requested them by both in-kernel unit drivers and
userspace applications.

This commit adds some tracepoints events for the aim.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Takashi Sakamoto <[email protected]>

Author: takaswie

drivers/firewire/core-iso.c

@@ -207,6 +207,10 @@ EXPORT_SYMBOL(fw_iso_context_queue_flush);
 
 int fw_iso_context_flush_completions(struct fw_iso_context *ctx)
 {
+	trace_isoc_outbound_flush_completions(ctx);
+	trace_isoc_inbound_single_flush_completions(ctx);
+	trace_isoc_inbound_multiple_flush_completions(ctx);
+
 	return ctx->card->driver->flush_iso_completions(ctx);
 }
 EXPORT_SYMBOL(fw_iso_context_flush_completions);

drivers/firewire/ohci.c

@@ -43,6 +43,8 @@
 #include "packet-header-definitions.h"
 #include "phy-packet-definitions.h"
 
+#include <trace/events/firewire.h>
+
 #define ohci_info(ohci, f, args...)	dev_info(ohci->card.device, f, ##args)
 #define ohci_notice(ohci, f, args...)	dev_notice(ohci->card.device, f, ##args)
 #define ohci_err(ohci, f, args...)	dev_err(ohci->card.device, f, ##args)

include/trace/events/firewire.h

@@ -706,6 +706,42 @@ DEFINE_EVENT_CONDITION(isoc_flush_template, isoc_inbound_multiple_flush,
 	TP_CONDITION(ctx->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL)
 );
 
+DECLARE_EVENT_CLASS(isoc_flush_completions_template,
+	TP_PROTO(const struct fw_iso_context *ctx),
+	TP_ARGS(ctx),
+	TP_STRUCT__entry(
+		__field(u64, context)
+		__field(u8, card_index)
+	),
+	TP_fast_assign(
+		__entry->context = (uintptr_t)ctx;
+		__entry->card_index = ctx->card->index;
+	),
+	TP_printk(
+		"context=0x%llx card_index=%u",
+		__entry->context,
+		__entry->card_index
+	)
+);
+
+DEFINE_EVENT_CONDITION(isoc_flush_completions_template, isoc_outbound_flush_completions,
+	TP_PROTO(const struct fw_iso_context *ctx),
+	TP_ARGS(ctx),
+	TP_CONDITION(ctx->type == FW_ISO_CONTEXT_TRANSMIT)
+);
+
+DEFINE_EVENT_CONDITION(isoc_flush_completions_template, isoc_inbound_single_flush_completions,
+	TP_PROTO(const struct fw_iso_context *ctx),
+	TP_ARGS(ctx),
+	TP_CONDITION(ctx->type == FW_ISO_CONTEXT_RECEIVE)
+);
+
+DEFINE_EVENT_CONDITION(isoc_flush_completions_template, isoc_inbound_multiple_flush_completions,
+	TP_PROTO(const struct fw_iso_context *ctx),
+	TP_ARGS(ctx),
+	TP_CONDITION(ctx->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL)
+);
+
 #undef QUADLET_SIZE
 
 #endif // _FIREWIRE_TRACE_EVENT_H