linux-kernel - Re: [PATCH v2 02/33] drm/tests: Add Kunit Helpers

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Message-ID: <3f7000ab-b845-a7e8-f215-02121da779b7@tronnes.org>
Date:   Sat, 24 Sep 2022 19:56:40 +0200
From:   Noralf Trønnes <noralf@...nnes.org>
To:     Maxime Ripard <maxime@...no.tech>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Maxime Ripard <mripard@...nel.org>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Emma Anholt <emma@...olt.net>,
        Karol Herbst <kherbst@...hat.com>,
        Samuel Holland <samuel@...lland.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>, Lyude Paul <lyude@...hat.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     Hans de Goede <hdegoede@...hat.com>, nouveau@...ts.freedesktop.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Phil Elwell <phil@...pberrypi.com>,
        intel-gfx@...ts.freedesktop.org, Dom Cobley <dom@...pberrypi.com>,
        linux-sunxi@...ts.linux.dev,
        Mateusz Kwiatkowski <kfyatek+publicgit@...il.com>,
        dri-devel@...ts.freedesktop.org,
        Noralf Trønnes <noralf@...nnes.org>
Subject: Re: [PATCH v2 02/33] drm/tests: Add Kunit Helpers



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@...no.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_
>