From bdc80ebe16c82fa589ce9c750e66d2f319123b8f Mon Sep 17 00:00:00 2001
From: Bradley Bolen <bbolen@lexmark.com>
Date: Tue, 3 Aug 2021 11:58:52 -0400
Subject: [PATCH] samples: tracing: Add a sample for tracing_user

The user tracing backend allows one to implement weak symbols to perform
user specific tracing, e.g gpio toggling or spi transactions.  This adds
a qemu sample that just does a simple printk for each of the traced
functions, but could be changed to do whatever function the user
desires.

Signed-off-by: Bradley Bolen <bbolen@lexmark.com>
---
 samples/subsys/tracing/CMakeLists.txt     |  1 +
 samples/subsys/tracing/prj_user.conf      |  2 ++
 samples/subsys/tracing/src/tracing_user.c | 32 +++++++++++++++++++++++
 3 files changed, 35 insertions(+)
 create mode 100644 samples/subsys/tracing/prj_user.conf
 create mode 100644 samples/subsys/tracing/src/tracing_user.c

diff --git a/samples/subsys/tracing/CMakeLists.txt b/samples/subsys/tracing/CMakeLists.txt
index 79e47acc01b..b42587f68a1 100644
--- a/samples/subsys/tracing/CMakeLists.txt
+++ b/samples/subsys/tracing/CMakeLists.txt
@@ -10,3 +10,4 @@ find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(tracing_tests)
 
 target_sources(app PRIVATE src/main.c)
+target_sources_ifdef(CONFIG_TRACING_USER app PRIVATE src/tracing_user.c)
diff --git a/samples/subsys/tracing/prj_user.conf b/samples/subsys/tracing/prj_user.conf
new file mode 100644
index 00000000000..843bd16a8d2
--- /dev/null
+++ b/samples/subsys/tracing/prj_user.conf
@@ -0,0 +1,2 @@
+CONFIG_TRACING=y
+CONFIG_TRACING_USER=y
diff --git a/samples/subsys/tracing/src/tracing_user.c b/samples/subsys/tracing/src/tracing_user.c
new file mode 100644
index 00000000000..a4a5d000442
--- /dev/null
+++ b/samples/subsys/tracing/src/tracing_user.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2020 Lexmark International, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <tracing_user.h>
+
+void sys_trace_thread_switched_in_user(struct k_thread *thread)
+{
+	printk("%s: %p\n", __func__, thread);
+}
+
+void sys_trace_thread_switched_out_user(struct k_thread *thread)
+{
+	printk("%s: %p\n", __func__, thread);
+}
+
+void sys_trace_isr_enter_user(void)
+{
+	printk("%s\n", __func__);
+}
+
+void sys_trace_isr_exit_user(void)
+{
+	printk("%s\n", __func__);
+}
+
+void sys_trace_idle_user(void)
+{
+	printk("%s\n", __func__);
+}