[PATCH 14/17] hyper-v: trace vmbus_negotiate_version()

[kys]

From: Vitaly Kuznetsov <vkuzn...@redhat.com>

Add tracepoint to CHANNELMSG_INITIATE_CONTACT sender.

Signed-off-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
Signed-off-by: K. Y. Srinivasan <k...@microsoft.com>
---
 drivers/hv/connection.c |  3 +++
 drivers/hv/hv_trace.h   | 26 ++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index b06a6b796819..05f413c4fe3b 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -117,6 +117,9 @@ static int vmbus_negotiate_version(struct 
vmbus_channel_msginfo *msginfo,
        ret = vmbus_post_msg(msg,
                             sizeof(struct vmbus_channel_initiate_contact),
                             true);
+
+       trace_vmbus_negotiate_version(msg, ret);
+
        if (ret != 0) {
                spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
                list_del(&msginfo->msglistentry);
diff --git a/drivers/hv/hv_trace.h b/drivers/hv/hv_trace.h
index cd33a52ef27f..f06284d64a8c 100644
--- a/drivers/hv/hv_trace.h
+++ b/drivers/hv/hv_trace.h
@@ -232,6 +232,32 @@ TRACE_EVENT(vmbus_teardown_gpadl,
                    )
        );
 
+TRACE_EVENT(vmbus_negotiate_version,
+           TP_PROTO(const struct vmbus_channel_initiate_contact *msg, int ret),
+           TP_ARGS(msg, ret),
+           TP_STRUCT__entry(
+                   __field(u32, ver)
+                   __field(u32, target_vcpu)
+                   __field(int, ret)
+                   __field(u64, int_page)
+                   __field(u64, mon_page1)
+                   __field(u64, mon_page2)
+                   ),
+           TP_fast_assign(
+                   __entry->ver = msg->vmbus_version_requested;
+                   __entry->target_vcpu = msg->target_vcpu;
+                   __entry->int_page = msg->interrupt_page;
+                   __entry->mon_page1 = msg->monitor_page1;
+                   __entry->mon_page2 = msg->monitor_page2;
+                   __entry->ret = ret;
+                   ),
+           TP_printk("sending vmbus_version_requested %d, target_vcpu 0x%x, "
+                     "pages %llx:%llx:%llx, ret %d",
+                     __entry->ver, __entry->target_vcpu, __entry->int_page,
+                     __entry->mon_page1, __entry->mon_page2, __entry->ret
+                   )
+       );
+
 #undef TRACE_INCLUDE_PATH
 #define TRACE_INCLUDE_PATH .
 #undef TRACE_INCLUDE_FILE
-- 
2.14.1

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