linux-kernel - [PATCH v3 11/17] hyper-v: trace vmbus_close

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Date:   Thu,  5 Oct 2017 16:50:38 +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 v3 11/17] hyper-v: trace vmbus_close_internal()

Add tracepoint to CHANNELMSG_CLOSECHANNEL sender.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 drivers/hv/channel.c  |  2 ++
 drivers/hv/hv_trace.h | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 82cb57e2d6bd..f919d9dd984b 100644
--- a/drivers/hv/channel.c
+++ b/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);
 		/*
diff --git a/drivers/hv/hv_trace.h b/drivers/hv/hv_trace.h
index 38fedb803bd8..302bd4e964f0 100644
--- a/drivers/hv/hv_trace.h
+++ b/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
-- 
2.13.6