hyper-v: trace vmbus_onoffer()

Add tracepoint to CHANNELMSG_OFFERCHANNEL handler.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hv/channel_mgmt.c

@@ -813,6 +813,8 @@ static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
 
 	offer = (struct vmbus_channel_offer_channel *)hdr;
 
+	trace_vmbus_onoffer(offer);
+
 	/* Allocate the channel object and save this offer. */
 	newchannel = alloc_channel();
 	if (!newchannel) {

drivers/hv/hv_trace.h

@@ -24,6 +24,43 @@ DEFINE_EVENT(vmbus_hdr_msg, vmbus_on_message,
 	TP_ARGS(hdr)
 );
 
+TRACE_EVENT(vmbus_onoffer,
+	    TP_PROTO(const struct vmbus_channel_offer_channel *offer),
+	    TP_ARGS(offer),
+	    TP_STRUCT__entry(
+		    __field(u32, child_relid)
+		    __field(u8, monitorid)
+		    __field(u16, is_ddc_int)
+		    __field(u32, connection_id)
+		    __array(char, if_type, 16)
+		    __array(char, if_instance, 16)
+		    __field(u16, chn_flags)
+		    __field(u16, mmio_mb)
+		    __field(u16, sub_idx)
+		    ),
+	    TP_fast_assign(__entry->child_relid = offer->child_relid;
+			   __entry->monitorid = offer->monitorid;
+			   __entry->is_ddc_int = offer->is_dedicated_interrupt;
+			   __entry->connection_id = offer->connection_id;
+			   memcpy(__entry->if_type,
+				  &offer->offer.if_type.b, 16);
+			   memcpy(__entry->if_instance,
+				  &offer->offer.if_instance.b, 16);
+			   __entry->chn_flags = offer->offer.chn_flags;
+			   __entry->mmio_mb = offer->offer.mmio_megabytes;
+			   __entry->sub_idx = offer->offer.sub_channel_index;
+		    ),
+	    TP_printk("child_relid 0x%x, monitorid 0x%x, is_dedicated %d, "
+		      "connection_id 0x%x, if_type %pUl, if_instance %pUl, "
+		      "chn_flags 0x%x, mmio_megabytes %d, sub_channel_index %d",
+		      __entry->child_relid, __entry->monitorid,
+		      __entry->is_ddc_int, __entry->connection_id,
+		      __entry->if_type, __entry->if_instance,
+		      __entry->chn_flags, __entry->mmio_mb,
+		      __entry->sub_idx
+		    )
+	);
+
 #undef TRACE_INCLUDE_PATH
 #define TRACE_INCLUDE_PATH .
 #undef TRACE_INCLUDE_FILE