2 files changed, 29 insertions, 0 deletions

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index a406beb10dd0..739b3fe1e0fb 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -185,6 +185,8 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
         ret = vmbus_post_msg(open_msg,
                              sizeof(struct vmbus_channel_open_channel), true);
 
+        trace_vmbus_open(open_msg, ret);
+
         if (ret != 0) {
                 err = ret;
                 goto error_clean_msglist;
diff --git a/drivers/hv/hv_trace.h b/drivers/hv/hv_trace.h
index 566ac0f2fe56..38fedb803bd8 100644
--- a/drivers/hv/hv_trace.h
+++ b/drivers/hv/hv_trace.h
@@ -130,6 +130,33 @@ TRACE_EVENT(vmbus_request_offers,
             TP_printk("sending ret %d", __entry->ret)
         );
 
+TRACE_EVENT(vmbus_open,
+            TP_PROTO(const struct vmbus_channel_open_channel *msg, int ret),
+            TP_ARGS(msg, ret),
+            TP_STRUCT__entry(
+                    __field(u32, child_relid)
+                    __field(u32, openid)
+                    __field(u32, gpadlhandle)
+                    __field(u32, target_vp)
+                    __field(u32, offset)
+                    __field(int, ret)
+                    ),
+            TP_fast_assign(
+                    __entry->child_relid = msg->child_relid;
+                    __entry->openid = msg->openid;
+                    __entry->gpadlhandle = msg->ringbuffer_gpadlhandle;
+                    __entry->target_vp = msg->target_vp;
+                    __entry->offset = msg->downstream_ringbuffer_pageoffset;
+                    __entry->ret = ret;
+                    ),
+            TP_printk("sending child_relid 0x%x, openid %d, "
+                      "gpadlhandle 0x%x, target_vp 0x%x, offset 0x%x, ret %d",
+                      __entry->child_relid,  __entry->openid,
+                      __entry->gpadlhandle, __entry->target_vp,
+                      __entry->offset, __entry->ret
+                    )
+        );
+
 #undef TRACE_INCLUDE_PATH
 #define TRACE_INCLUDE_PATH .
 #undef TRACE_INCLUDE_FILE