[PATCH 15/16] hyper-v: trace vmbus_release_relid()

[Vitaly Kuznetsov]

Add tracepoint to CHANNELMSG_RELID_RELEASED sender.

Signed-off-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
---
 drivers/hv/channel_mgmt.c |  7 +++++--
 drivers/hv/hv_trace.h     | 16 ++++++++++++++++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 5c39388545f5..ca2dea638bfb 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -373,12 +373,15 @@ static void percpu_channel_deq(void *arg)
 static void vmbus_release_relid(u32 relid)
 {
        struct vmbus_channel_relid_released msg;
+       int ret;
 
        memset(&msg, 0, sizeof(struct vmbus_channel_relid_released));
        msg.child_relid = relid;
        msg.header.msgtype = CHANNELMSG_RELID_RELEASED;
-       vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released),
-                      true);
+       ret = vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released),
+                            true);
+
+       trace_vmbus_release_relid(&msg, ret);
 }
 
 void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid)
diff --git a/drivers/hv/hv_trace.h b/drivers/hv/hv_trace.h
index 70a4ae28e843..f2c1f45df647 100644
--- a/drivers/hv/hv_trace.h
+++ b/drivers/hv/hv_trace.h
@@ -256,6 +256,22 @@ TRACE_EVENT(vmbus_negotiate_version,
                    )
        );
 
+TRACE_EVENT(vmbus_release_relid,
+           TP_PROTO(const struct vmbus_channel_relid_released *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
-- 
2.13.5