From baf556e423385c116217e143fe352d2b062a10e3 Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime@cerno.tech>
Date: Mon, 14 Nov 2022 14:00:21 +0100
Subject: [PATCH] drm/tests: Add Kunit Helpers
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As the number of kunit tests in KMS grows further, we start to have
multiple test suites that, for example, need to register a mock DRM
driver to interact with the KMS function they are supposed to test.
Let's add a file meant to provide those kind of helpers to avoid
duplication.
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Tested-by: Mateusz Kwiatkowski <kfyatek+publicgit@gmail.com>
Link: https://lore.kernel.org/r/20220728-rpi-analog-tv-properties-v9-2-24b168e5bcd5@cerno.tech
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
drivers/gpu/drm/tests/Makefile | 1 +
drivers/gpu/drm/tests/drm_kunit_helpers.c | 64 +++++++++++++++++++++++
drivers/gpu/drm/tests/drm_kunit_helpers.h | 9 ++++
3 files changed, 74 insertions(+)
create mode 100644 drivers/gpu/drm/tests/drm_kunit_helpers.c
create mode 100644 drivers/gpu/drm/tests/drm_kunit_helpers.h
--- a/drivers/gpu/drm/tests/Makefile
+++ b/drivers/gpu/drm/tests/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_DRM_KUNIT_TEST) += \
drm_format_helper_test.o \
drm_format_test.o \
drm_framebuffer_test.o \
+ drm_kunit_helpers.o \
drm_mm_test.o \
drm_plane_helper_test.o \
drm_rect_test.o
--- /dev/null
+++ b/drivers/gpu/drm/tests/drm_kunit_helpers.c
@@ -0,0 +1,64 @@
+#include <drm/drm_drv.h>
+#include <drm/drm_managed.h>
+
+#include <kunit/resource.h>
+
+#include <linux/device.h>
+
+struct kunit_dev {
+ struct drm_device base;
+};
+
+static const struct drm_mode_config_funcs drm_mode_config_funcs = {
+};
+
+static int dev_init(struct kunit_resource *res, void *ptr)
+{
+ char *name = ptr;
+ struct device *dev;
+
+ dev = root_device_register(name);
+ if (IS_ERR(dev))
+ return PTR_ERR(dev);
+
+ res->data = dev;
+ return 0;
+}
+
+static void dev_free(struct kunit_resource *res)
+{
+ struct device *dev = res->data;
+
+ root_device_unregister(dev);
+}
+
+struct drm_device *drm_kunit_device_init(struct kunit *test, u32 features, char *name)
+{
+ struct kunit_dev *kdev;
+ struct drm_device *drm;
+ struct drm_driver *driver;
+ struct device *dev;
+ int ret;
+
+ dev = kunit_alloc_resource(test, dev_init, dev_free, GFP_KERNEL, name);
+ if (!dev)
+ return ERR_PTR(-ENOMEM);
+
+ driver = kunit_kzalloc(test, sizeof(*driver), GFP_KERNEL);
+ if (!driver)
+ return ERR_PTR(-ENOMEM);
+
+ driver->driver_features = features;
+ kdev = devm_drm_dev_alloc(dev, driver, struct kunit_dev, base);
+ if (IS_ERR(kdev))
+ return ERR_CAST(kdev);
+
+ drm = &kdev->base;
+ drm->mode_config.funcs = &drm_mode_config_funcs;
+
+ ret = drmm_mode_config_init(drm);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return drm;
+}
--- /dev/null
+++ b/drivers/gpu/drm/tests/drm_kunit_helpers.h
@@ -0,0 +1,9 @@
+#ifndef DRM_KUNIT_HELPERS_H_
+#define DRM_KUNIT_HELPERS_H_
+
+struct drm_device;
+struct kunit;
+
+struct drm_device *drm_kunit_device_init(struct kunit *test, u32 features, char *name);
+
+#endif // DRM_KUNIT_HELPERS_H_