firewire: core: add tracepoints events for asynchronous outbound response

In a view of core transaction service, the asynchronous outbound response
consists of two stages; initiation and completion.

This commit adds a pair of events for the asynchronous outbound response.
The following example is for asynchronous write quadlet request as IEC
61883-1 FCP response to node 0xffc1.

async_response_outbound_initiate: \
  transaction=0xffff89fa08cf16c0 generation=4 scode=2 dst_id=0xffc1 \
  tlabel=25 tcode=2 src_id=0xffc0 rcode=0 \
  header={0xffc16420,0xffc00000,0x0,0x0} data={}
async_response_outbound_complete: \
  transaction=0xffff89fa08cf16c0 generation=4 scode=2 status=1 \
  timestamp=0x0000

Link: https://lore.kernel.org/r/20240429043218.609398-6-o-takashi@sakamocchi.jpSigned-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>

drivers/firewire/core-transaction.c

@@ -668,6 +668,9 @@ static void free_response_callback(struct fw_packet *packet,
 {
 	struct fw_request *request = container_of(packet, struct fw_request, response);
 
+	trace_async_response_outbound_complete((uintptr_t)request, packet->generation,
+					       packet->speed, status, packet->timestamp);
+
 	// Decrease the reference count since not at in-flight.
 	fw_request_put(request);
 
@@ -850,6 +853,9 @@ static struct fw_request *allocate_request(struct fw_card *card,
 void fw_send_response(struct fw_card *card,
 		      struct fw_request *request, int rcode)
 {
+	u32 *data = NULL;
+	unsigned int data_length = 0;
+
 	/* unified transaction or broadcast transaction: don't respond */
 	if (request->ack != ACK_PENDING ||
 	    HEADER_DESTINATION_IS_BROADCAST(request->request_header)) {
@@ -857,17 +863,20 @@ void fw_send_response(struct fw_card *card,
 		return;
 	}
 
-	if (rcode == RCODE_COMPLETE)
-		fw_fill_response(&request->response, request->request_header,
-				 rcode, request->data,
-				 fw_get_response_length(request));
-	else
-		fw_fill_response(&request->response, request->request_header,
-				 rcode, NULL, 0);
+	if (rcode == RCODE_COMPLETE) {
+		data = request->data;
+		data_length = fw_get_response_length(request);
+	}
+
+	fw_fill_response(&request->response, request->request_header, rcode, data, data_length);
 
 	// Increase the reference count so that the object is kept during in-flight.
 	fw_request_get(request);
 
+	trace_async_response_outbound_initiate((uintptr_t)request, request->response.generation,
+					       request->response.speed, request->response.header,
+					       data, data ? data_length / 4 : 0);
+
 	card->driver->send_response(card, &request->response);
 }
 EXPORT_SYMBOL(fw_send_response);

include/trace/events/firewire.h

@@ -174,6 +174,30 @@ DEFINE_EVENT_PRINT(async_inbound_template, async_request_inbound,
 	)
 );
 
+DEFINE_EVENT_PRINT(async_outbound_initiate_template, async_response_outbound_initiate,
+	TP_PROTO(u64 transaction, unsigned int generation, unsigned int scode, const u32 *header, const u32 *data, unsigned int data_count),
+	TP_ARGS(transaction, generation, scode, header, data, data_count),
+	TP_printk(
+		"transaction=0x%llx generation=%u scode=%u dst_id=0x%04x tlabel=%u tcode=%u src_id=0x%04x rcode=%u header=%s data=%s",
+		__entry->transaction,
+		__entry->generation,
+		__entry->scode,
+		ASYNC_HEADER_GET_DESTINATION(__entry->header),
+		ASYNC_HEADER_GET_TLABEL(__entry->header),
+		ASYNC_HEADER_GET_TCODE(__entry->header),
+		ASYNC_HEADER_GET_SOURCE(__entry->header),
+		ASYNC_HEADER_GET_RCODE(__entry->header),
+		__print_array(__entry->header, ASYNC_HEADER_QUADLET_COUNT, QUADLET_SIZE),
+		__print_array(__get_dynamic_array(data),
+			      __get_dynamic_array_len(data) / QUADLET_SIZE, QUADLET_SIZE)
+	)
+);
+
+DEFINE_EVENT(async_outbound_complete_template, async_response_outbound_complete,
+	TP_PROTO(u64 transaction, unsigned int generation, unsigned int scode, unsigned int status, unsigned int timestamp),
+	TP_ARGS(transaction, generation, scode, status, timestamp)
+);
+
 #undef ASYNC_HEADER_GET_DESTINATION
 #undef ASYNC_HEADER_GET_TLABEL
 #undef ASYNC_HEADER_GET_TCODE