From 3099491f3eccd8e16e69400890ae63562282574e Mon Sep 17 00:00:00 2001
From: Mathieu Choplain <mathieu.choplain@st.com>
Date: Mon, 15 Jul 2024 12:29:50 +0200
Subject: [PATCH] tests: dma/chan_blen_transfer: relocate TX and RX buffers

This commit places the chan_blen_transfer DMA test's TX and RX buffers
in a separate file that gets entirely relocated. This ensures that the
buffers reside in the correct memory, without breaking other things
due to relocation of test data/code.

Fixes #75676.

Signed-off-by: Mathieu Choplain <mathieu.choplain@st.com>
---
 tests/drivers/dma/chan_blen_transfer/CMakeLists.txt  |  4 +++-
 .../dma/chan_blen_transfer/src/test_buffers.c        | 12 ++++++++++++
 .../dma/chan_blen_transfer/src/test_buffers.h        | 12 ++++++++++++
 tests/drivers/dma/chan_blen_transfer/src/test_dma.c  |  5 +----
 4 files changed, 28 insertions(+), 5 deletions(-)
 create mode 100644 tests/drivers/dma/chan_blen_transfer/src/test_buffers.c
 create mode 100644 tests/drivers/dma/chan_blen_transfer/src/test_buffers.h

diff --git a/tests/drivers/dma/chan_blen_transfer/CMakeLists.txt b/tests/drivers/dma/chan_blen_transfer/CMakeLists.txt
index 7683c4ebce2..bc85cc0f830 100644
--- a/tests/drivers/dma/chan_blen_transfer/CMakeLists.txt
+++ b/tests/drivers/dma/chan_blen_transfer/CMakeLists.txt
@@ -7,4 +7,6 @@ project(chan_blen_transfer)
 FILE(GLOB app_sources src/*.c)
 target_sources(app PRIVATE ${app_sources})
 
-zephyr_code_relocate(FILES src/test_dma.c LOCATION ${CONFIG_DMA_LOOP_TRANSFER_RELOCATE_SECTION}_RODATA_BSS)
+if (CONFIG_DMA_LOOP_TRANSFER_RELOCATE_SECTION)
+  zephyr_code_relocate(FILES src/test_buffers.c LOCATION ${CONFIG_DMA_LOOP_TRANSFER_RELOCATE_SECTION})
+endif()
diff --git a/tests/drivers/dma/chan_blen_transfer/src/test_buffers.c b/tests/drivers/dma/chan_blen_transfer/src/test_buffers.c
new file mode 100644
index 00000000000..3ec893f15c3
--- /dev/null
+++ b/tests/drivers/dma/chan_blen_transfer/src/test_buffers.c
@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2024 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+
+#include "test_buffers.h"
+
+__aligned(32) char tx_data[TEST_BUF_SIZE] = "It is harder to be kind than to be wise........";
+__aligned(32) char rx_data[TEST_BUF_SIZE] = { 0 };
diff --git a/tests/drivers/dma/chan_blen_transfer/src/test_buffers.h b/tests/drivers/dma/chan_blen_transfer/src/test_buffers.h
new file mode 100644
index 00000000000..d69bf914fdc
--- /dev/null
+++ b/tests/drivers/dma/chan_blen_transfer/src/test_buffers.h
@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2024 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdint.h>
+
+#define TEST_BUF_SIZE (48)
+
+extern char tx_data[TEST_BUF_SIZE];
+extern char rx_data[TEST_BUF_SIZE];
diff --git a/tests/drivers/dma/chan_blen_transfer/src/test_dma.c b/tests/drivers/dma/chan_blen_transfer/src/test_dma.c
index 054bb6b89b9..d5b2b7f7ad8 100644
--- a/tests/drivers/dma/chan_blen_transfer/src/test_dma.c
+++ b/tests/drivers/dma/chan_blen_transfer/src/test_dma.c
@@ -20,10 +20,7 @@
 #include <zephyr/drivers/dma.h>
 #include <zephyr/ztest.h>
 
-#define RX_BUFF_SIZE (48)
-
-static __aligned(32) char tx_data[] = "It is harder to be kind than to be wise........";
-static __aligned(32) char rx_data[RX_BUFF_SIZE] = { 0 };
+#include "test_buffers.h"
 
 static void test_done(const struct device *dma_dev, void *arg,
 		      uint32_t id, int status)