linux-kernel - [PATCH 16/16] hyper-v: trace vmbus_send_tl_connect

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Date:   Wed, 20 Sep 2017 19:22:07 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     devel@...uxdriverproject.org
Cc:     linux-kernel@...r.kernel.org,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH 16/16] hyper-v: trace vmbus_send_tl_connect_request()

Add tracepoint to CHANNELMSG_TL_CONNECT_REQUEST sender.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 drivers/hv/channel.c  |  7 ++++++-
 drivers/hv/hv_trace.h | 20 ++++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 2422ef6f9164..71bdd2bb6647 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -236,13 +236,18 @@ int vmbus_send_tl_connect_request(const uuid_le *shv_guest_servie_id,
 				  const uuid_le *shv_host_servie_id)
 {
 	struct vmbus_channel_tl_connect_request conn_msg;
+	int ret;
 
 	memset(&conn_msg, 0, sizeof(conn_msg));
 	conn_msg.header.msgtype = CHANNELMSG_TL_CONNECT_REQUEST;
 	conn_msg.guest_endpoint_id = *shv_guest_servie_id;
 	conn_msg.host_service_id = *shv_host_servie_id;
 
-	return vmbus_post_msg(&conn_msg, sizeof(conn_msg), true);
+	ret = vmbus_post_msg(&conn_msg, sizeof(conn_msg), true);
+
+	trace_vmbus_send_tl_connect_request(&conn_msg, ret);
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(vmbus_send_tl_connect_request);
 
diff --git a/drivers/hv/hv_trace.h b/drivers/hv/hv_trace.h
index f2c1f45df647..1d7e90fbeaa0 100644
--- a/drivers/hv/hv_trace.h
+++ b/drivers/hv/hv_trace.h
@@ -272,6 +272,26 @@ TRACE_EVENT(vmbus_release_relid,
 		    )
 	);
 
+TRACE_EVENT(vmbus_send_tl_connect_request,
+	    TP_PROTO(const struct vmbus_channel_tl_connect_request *msg,
+		     int ret),
+	    TP_ARGS(msg, ret),
+	    TP_STRUCT__entry(
+		    __array(char, guest_id, 16)
+		    __array(char, host_id, 16)
+		    __field(int, ret)
+		    ),
+	    TP_fast_assign(
+		    memcpy(__entry->guest_id, &msg->guest_endpoint_id.b, 16);
+		    memcpy(__entry->host_id, &msg->host_service_id.b, 16);
+		    __entry->ret = ret;
+		    ),
+	    TP_printk("sending guest_endpoint_id %pUl, host_service_id %pUl, "
+		      "ret %d",
+		      __entry->guest_id, __entry->host_id, __entry->ret
+		    )
+	);
+
 #undef TRACE_INCLUDE_PATH
 #define TRACE_INCLUDE_PATH .
 #undef TRACE_INCLUDE_FILE
-- 
2.13.5