Add script to run kunit-tests for evdi module

Run ./ci/run_kunit to execute unit tests for evdi module

Jenkinsfile

@@ -84,6 +84,13 @@ pipeline {
                 }
             }
         }
+        stage ('Run KUnit tests') {
+            steps {
+                sh '''#!/usr/bin/env bash
+                [ -d tmp/linux ] && (cd tmp/linux; git checkout -f master; git reset --hard origin/master)
+                ./ci/run_kunit'''
+            }
+        }
         stage ('Build against released kernels') {
             steps {
                 sh '''#!/usr/bin/env bash

ci/run_kunit

@@ -0,0 +1,44 @@
+#! /usr/bin/env bash
+# Copyright (c) 2024 DisplayLink (UK) Ltd.
+
+set -e
+set -u
+
+clone_linux()
+{
+  echo "Clone linux repository"
+  local linux_mirror="https://oauth2:glpat-jeZZawHtkoZ3xLHWGCJQ@gitlab/ppd_posix/linux.git"
+  if curl -k --output /dev/null --silent --head --fail "$linux_mirror"; then
+    git -c http.sslVerify=false clone --depth 1 "$linux_mirror"
+    (cd linux; git config http.sslVerify false)
+  else
+    git clone --depth 1 https://github.com/torvalds/linux
+  fi
+}
+
+patch_linux_with_evdi_module()
+{
+  local EVDI_REPO_DIR="$1"
+  local LINUX_DIR="$2"
+
+  [ -f "$LINUX_DIR/drivers/gpu/drm/evdi/Kconfig" ] && return
+
+  (cd "$LINUX_DIR"
+  ln -s -T "${EVDI_REPO_DIR}"/module drivers/gpu/drm/evdi
+  echo -e "\nsource \"drivers/gpu/drm/evdi/Kconfig\"" >> drivers/gpu/drm/Kconfig
+  echo "obj-\$(CONFIG_DRM_EVDI) += evdi/" >> drivers/gpu/drm/Makefile
+
+  make ARCH=um mrproper)
+}
+
+EVDI_REPO_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")/.."; pwd)
+LINUX_DIR=$EVDI_REPO_DIR/tmp/linux
+mkdir -p "$EVDI_REPO_DIR/tmp"
+[ -d "${EVDI_REPO_DIR}"/tmp/linux ] || (cd "$EVDI_REPO_DIR/tmp"; clone_linux)
+
+patch_linux_with_evdi_module "$EVDI_REPO_DIR" "$LINUX_DIR"
+
+echo "Run kunit tests for evdi module"
+(cd "${LINUX_DIR}"
+./tools/testing/kunit/kunit.py run --kunitconfig=drivers/gpu/drm/evdi/tests/.kunitconfig)
+

ci/run_style_check

@@ -24,7 +24,7 @@ result=0
 ./checkpatch.pl --terse --no-tree --ignore NEW_TYPEDEFS -f ./library/*
 result=$((result || $?))
 
-./checkpatch.pl --terse --no-tree --ignore LINUX_VERSION_CODE,PREFER_PR_LEVEL -f ./module/*
+find ./module -type f -exec ./checkpatch.pl --terse --no-tree --ignore LINUX_VERSION_CODE,PREFER_PR_LEVEL -f {} +
 result=$((result || $?))
 
 rm "${files[@]}"

module/Kconfig

@@ -20,3 +20,14 @@ config DRM_EVDI
 		retrieve contents (as a frame buffer) that system renders on it.
 		Say M/Y to add support for these devices via DRM/KMS interfaces.
 
+config DRM_EVDI_KUNIT_TEST
+	tristate "KUnit tests for evdi" if !KUNIT_ALL_TESTS
+		depends on DRM_EVDI && KUNIT
+		default KUNIT_ALL_TESTS
+	help
+		KUnit tests for evdi DRM module.
+		This option is useful for kernel developers.
+		Please remember to provide tests for code you add.
+
+		If in doubt, say "N".
+

module/Makefile

@@ -49,11 +49,11 @@ ifneq ($(KERNELRELEASE),)
 
 # inside kbuild
 # Note: this can be removed once it is in kernel tree and Kconfig is properly used
-CONFIG_DRM_EVDI := m
 ccflags-y := -isystem include/uapi/drm $(CFLAGS) $(EL8FLAG) $(EL9FLAG) $(RPIFLAG)
 evdi-y := evdi_platform_drv.o evdi_platform_dev.o evdi_sysfs.o evdi_modeset.o evdi_connector.o evdi_encoder.o evdi_drm_drv.o evdi_fb.o evdi_gem.o evdi_painter.o evdi_params.o evdi_cursor.o evdi_debug.o evdi_i2c.o
 evdi-$(CONFIG_COMPAT) += evdi_ioc32.o
 obj-$(CONFIG_DRM_EVDI) := evdi.o
+obj-y += tests/
 
 else
 

module/tests/.kunitconfig

@@ -0,0 +1,8 @@
+CONFIG_KUNIT=y
+
+CONFIG_DRM=y
+CONFIG_MODULES=y
+CONFIG_DRM_EVDI=y
+
+CONFIG_DRM_KUNIT_TEST=y
+CONFIG_DRM_EVDI_KUNIT_TEST=y

module/tests/Makefile

@@ -0,0 +1,4 @@
+
+ccflags-$(CONFIG_DRM_EVDI_KUNIT_TEST) += -I $(srctree)/$(src)/..
+obj-$(CONFIG_DRM_EVDI_KUNIT_TEST) += evdi_test.o
+

module/tests/evdi_test.c

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2024 DisplayLink (UK) Ltd.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License v2. See the file COPYING in the main directory of this archive for
+ * more details.
+ */
+
+
+#include <kunit/test.h>
+#include <kunit/device.h>
+#include "evdi_drm_drv.h"
+
+static void test_evdi_create_drm_device(struct kunit *test)
+{
+  struct device* parent = kunit_device_register(test, "/dev/card1");
+  struct drm_device* dev = evdi_drm_device_create(parent);
+
+  KUNIT_EXPECT_NOT_NULL(test, dev);
+
+  evdi_drm_device_remove(dev);
+
+  kunit_device_unregister(test, parent);
+}
+
+static struct kunit_case evdi_test_cases[] = {
+	KUNIT_CASE(test_evdi_create_drm_device),
+	{}
+};
+
+static struct kunit_suite evdi_test_suite = {
+	.name = "drm_evdi_tests",
+	.test_cases = evdi_test_cases,
+};
+
+kunit_test_suite(evdi_test_suite);
+
+MODULE_LICENSE("GPL");