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

It is helpful to trace the flushing 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

@@ -197,6 +197,10 @@ EXPORT_SYMBOL(fw_iso_context_queue);
 
 void fw_iso_context_queue_flush(struct fw_iso_context *ctx)
 {
+	trace_isoc_outbound_flush(ctx);
+	trace_isoc_inbound_single_flush(ctx);
+	trace_isoc_inbound_multiple_flush(ctx);
+
 	ctx->card->driver->flush_queue_iso(ctx);
 }
 EXPORT_SYMBOL(fw_iso_context_queue_flush);

include/trace/events/firewire.h

@@ -670,6 +670,42 @@ DEFINE_EVENT_CONDITION(isoc_stop_template, isoc_inbound_multiple_stop,
 	TP_CONDITION(ctx->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL)
 );
 
+DECLARE_EVENT_CLASS(isoc_flush_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_template, isoc_outbound_flush,
+	TP_PROTO(const struct fw_iso_context *ctx),
+	TP_ARGS(ctx),
+	TP_CONDITION(ctx->type == FW_ISO_CONTEXT_TRANSMIT)
+);
+
+DEFINE_EVENT_CONDITION(isoc_flush_template, isoc_inbound_single_flush,
+	TP_PROTO(const struct fw_iso_context *ctx),
+	TP_ARGS(ctx),
+	TP_CONDITION(ctx->type == FW_ISO_CONTEXT_RECEIVE)
+);
+
+DEFINE_EVENT_CONDITION(isoc_flush_template, isoc_inbound_multiple_flush,
+	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