net: qrtr: Add tracepoint support

Add tracepoint support for QRTR with NS as the first candidate. Later on
this can be extended to core QRTR and transport drivers.

The trace_printk() used in NS has been replaced by tracepoints.
Signed-off-by: NManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/trace/events/qrtr.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM qrtr
+
+#if !defined(_TRACE_QRTR_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_QRTR_H
+
+#include <linux/qrtr.h>
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(qrtr_ns_service_announce_new,
+
+	TP_PROTO(__le32 service, __le32 instance, __le32 node, __le32 port),
+
+	TP_ARGS(service, instance, node, port),
+
+	TP_STRUCT__entry(
+		__field(__le32, service)
+		__field(__le32, instance)
+		__field(__le32, node)
+		__field(__le32, port)
+	),
+
+	TP_fast_assign(
+		__entry->service = service;
+		__entry->instance = instance;
+		__entry->node = node;
+		__entry->port = port;
+	),
+
+	TP_printk("advertising new server [%d:%x]@[%d:%d]",
+		  __entry->service, __entry->instance, __entry->node,
+		  __entry->port
+	)
+);
+
+TRACE_EVENT(qrtr_ns_service_announce_del,
+
+	TP_PROTO(__le32 service, __le32 instance, __le32 node, __le32 port),
+
+	TP_ARGS(service, instance, node, port),
+
+	TP_STRUCT__entry(
+		__field(__le32, service)
+		__field(__le32, instance)
+		__field(__le32, node)
+		__field(__le32, port)
+	),
+
+	TP_fast_assign(
+		__entry->service = service;
+		__entry->instance = instance;
+		__entry->node = node;
+		__entry->port = port;
+	),
+
+	TP_printk("advertising removal of server [%d:%x]@[%d:%d]",
+		  __entry->service, __entry->instance, __entry->node,
+		  __entry->port
+	)
+);
+
+TRACE_EVENT(qrtr_ns_server_add,
+
+	TP_PROTO(__le32 service, __le32 instance, __le32 node, __le32 port),
+
+	TP_ARGS(service, instance, node, port),
+
+	TP_STRUCT__entry(
+		__field(__le32, service)
+		__field(__le32, instance)
+		__field(__le32, node)
+		__field(__le32, port)
+	),
+
+	TP_fast_assign(
+		__entry->service = service;
+		__entry->instance = instance;
+		__entry->node = node;
+		__entry->port = port;
+	),
+
+	TP_printk("add server [%d:%x]@[%d:%d]",
+		  __entry->service, __entry->instance, __entry->node,
+		  __entry->port
+	)
+);
+
+TRACE_EVENT(qrtr_ns_message,
+
+	TP_PROTO(const char * const ctrl_pkt_str, __u32 sq_node, __u32 sq_port),
+
+	TP_ARGS(ctrl_pkt_str, sq_node, sq_port),
+
+	TP_STRUCT__entry(
+		__string(ctrl_pkt_str, ctrl_pkt_str)
+		__field(__u32, sq_node)
+		__field(__u32, sq_port)
+	),
+
+	TP_fast_assign(
+		__assign_str(ctrl_pkt_str, ctrl_pkt_str);
+		__entry->sq_node = sq_node;
+		__entry->sq_port = sq_port;
+	),
+
+	TP_printk("%s from %d:%d",
+		  __get_str(ctrl_pkt_str), __entry->sq_node, __entry->sq_port
+	)
+);
+
+#endif /* _TRACE_QRTR_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>

net/qrtr/ns.c

@@ -12,6 +12,9 @@
 
 #include "qrtr.h"
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/qrtr.h>
+
 static RADIX_TREE(nodes, GFP_KERNEL);
 
 static struct {
@@ -105,8 +108,8 @@ static int service_announce_new(struct sockaddr_qrtr *dest,
 	struct msghdr msg = { };
 	struct kvec iv;
 
-	trace_printk("advertising new server [%d:%x]@[%d:%d]\n",
-		     srv->service, srv->instance, srv->node, srv->port);
+	trace_qrtr_ns_service_announce_new(srv->service, srv->instance,
+					   srv->node, srv->port);
 
 	iv.iov_base = &pkt;
 	iv.iov_len = sizeof(pkt);
@@ -132,8 +135,8 @@ static int service_announce_del(struct sockaddr_qrtr *dest,
 	struct kvec iv;
 	int ret;
 
-	trace_printk("advertising removal of server [%d:%x]@[%d:%d]\n",
-		     srv->service, srv->instance, srv->node, srv->port);
+	trace_qrtr_ns_service_announce_del(srv->service, srv->instance,
+					   srv->node, srv->port);
 
 	iv.iov_base = &pkt;
 	iv.iov_len = sizeof(pkt);
@@ -244,8 +247,8 @@ static struct qrtr_server *server_add(unsigned int service,
 
 	radix_tree_insert(&node->servers, port, srv);
 
-	trace_printk("add server [%d:%x]@[%d:%d]\n", srv->service,
-		     srv->instance, srv->node, srv->port);
+	trace_qrtr_ns_server_add(srv->service, srv->instance,
+				 srv->node, srv->port);
 
 	return srv;
 
@@ -633,9 +636,8 @@ static void qrtr_ns_worker(struct work_struct *work)
 		cmd = le32_to_cpu(pkt->cmd);
 		if (cmd < ARRAY_SIZE(qrtr_ctrl_pkt_strings) &&
 		    qrtr_ctrl_pkt_strings[cmd])
-			trace_printk("%s from %d:%d\n",
-				     qrtr_ctrl_pkt_strings[cmd], sq.sq_node,
-				     sq.sq_port);
+			trace_qrtr_ns_message(qrtr_ctrl_pkt_strings[cmd],
+					      sq.sq_node, sq.sq_port);
 
 		ret = 0;
 		switch (cmd) {