[PATCH v2 02/33] drm/tests: Add Kunit Helpers

[Noralf Trønnes]

Den 22.09.2022 16.25, skrev Maxime Ripard:
> 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.
> 
> Signed-off-by: Maxime Ripard <maxime at cerno.tech>
> 
> diff --git a/drivers/gpu/drm/tests/Makefile b/drivers/gpu/drm/tests/Makefile
> index 2d9f49b62ecb..b29ef1085cad 100644
> --- 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
> diff --git a/drivers/gpu/drm/tests/drm_kunit_helpers.c b/drivers/gpu/drm/tests/drm_kunit_helpers.c
> new file mode 100644
> index 000000000000..7ebd620481c1
> --- /dev/null
> +++ b/drivers/gpu/drm/tests/drm_kunit_helpers.c
> @@ -0,0 +1,54 @@
> +#include <drm/drm_drv.h>
> +#include <drm/drm_managed.h>
> +
> +#include <linux/device.h>
> +
> +static const struct drm_mode_config_funcs drm_mode_config_funcs = {
> +};
> +
> +static const struct drm_driver drm_mode_driver = {
> +};
> +
> +static void drm_kunit_free_device(struct drm_device *drm, void *ptr)
> +{
> +	struct device *dev = ptr;
> +
> +	root_device_unregister(dev);
> +}
> +
> +struct drm_device *drm_kunit_device_init(const char *name)
> +{
> +	struct drm_device *drm;
> +	struct device *dev;
> +	int ret;
> +
> +	dev = root_device_register(name);
> +	if (IS_ERR(dev))
> +		return ERR_CAST(dev);
> +
> +	drm = drm_dev_alloc(&drm_mode_driver, dev);

I can't find drm being freed anywhere?
Maybe you could assign it to drm->managed.final_kfree.

Noralf.

> +	if (IS_ERR(drm)) {
> +		root_device_unregister(dev);
> +		return ERR_CAST(drm);
> +	}
> +	drm->mode_config.funcs = &drm_mode_config_funcs;
> +
> +	ret = drmm_add_action_or_reset(drm, drm_kunit_free_device, dev);
> +	if (ret)
> +		goto err_put_device;
> +
> +	ret = drmm_mode_config_init(drm);
> +	if (ret)
> +		return ERR_PTR(ret);
> +
> +	return drm;
> +
> +err_put_device:
> +	drm_dev_put(drm);
> +	return ERR_PTR(ret);
> +}
> +
> +void drm_kunit_device_exit(struct drm_device *drm)
> +{
> +	drm_dev_put(drm);
> +}
> diff --git a/drivers/gpu/drm/tests/drm_kunit_helpers.h b/drivers/gpu/drm/tests/drm_kunit_helpers.h
> new file mode 100644
> index 000000000000..5015a327a8c1
> --- /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 drm_device *drm_kunit_device_init(const char *name);
> +void drm_kunit_device_exit(struct drm_device *drm);
> +
> +#endif // DRM_KUNIT_HELPERS_H_
>