hyper-v: trace vmbus_close_internal()

Add tracepoint to CHANNELMSG_CLOSECHANNEL sender.
Signed-off-by: NVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: NK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hv/channel.c

@@ -591,6 +591,8 @@ static int vmbus_close_internal(struct vmbus_channel *channel)
 	ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel),
 			     true);
 
+	trace_vmbus_close_internal(msg, ret);
+
 	if (ret) {
 		pr_err("Close failed: close post msg return is %d\n", ret);
 		/*

drivers/hv/hv_trace.h

@@ -157,6 +157,21 @@ TRACE_EVENT(vmbus_open,
 		    )
 	);
 
+TRACE_EVENT(vmbus_close_internal,
+	    TP_PROTO(const struct vmbus_channel_close_channel *msg, int ret),
+	    TP_ARGS(msg, ret),
+	    TP_STRUCT__entry(
+		    __field(u32, child_relid)
+		    __field(int, ret)
+		    ),
+	    TP_fast_assign(
+		    __entry->child_relid = msg->child_relid;
+		    __entry->ret = ret;
+		    ),
+	    TP_printk("sending child_relid 0x%x, ret %d", __entry->child_relid,
+		    __entry->ret)
+	);
+
 #undef TRACE_INCLUDE_PATH
 #define TRACE_INCLUDE_PATH .
 #undef TRACE_INCLUDE_FILE