s390/ap: add debug possibility for AP messages

This patch introduces two dynamic debug hexdump
invocation possibilities to be able to a) dump an
AP message immediately before it goes into the
firmware queue and b) dump a fresh from the
firmware queue received AP message.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

drivers/s390/crypto/ap_queue.c

@@ -136,6 +136,8 @@ static struct ap_queue_status ap_sm_recv(struct ap_queue *aq)
 
 	switch (status.response_code) {
 	case AP_RESPONSE_NORMAL:
+		print_hex_dump_debug("aprpl: ", DUMP_PREFIX_ADDRESS, 16, 1,
+				     aq->reply->msg, aq->reply->len, false);
 		aq->queue_count = max_t(int, 0, aq->queue_count - 1);
 		if (!status.queue_empty && !aq->queue_count)
 			aq->queue_count++;
@@ -246,6 +248,8 @@ static enum ap_sm_wait ap_sm_write(struct ap_queue *aq)
 
 	/* Start the next request on the queue. */
 	ap_msg = list_entry(aq->requestq.next, struct ap_message, list);
+	print_hex_dump_debug("apreq: ", DUMP_PREFIX_ADDRESS, 16, 1,
+			     ap_msg->msg, ap_msg->len, false);
 	status = __ap_send(qid, ap_msg->psmid,
 			   ap_msg->msg, ap_msg->len,
 			   ap_msg->flags & AP_MSG_FLAG_SPECIAL);