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Date:   Mon, 26 Sep 2022 11:36:12 +0200
From:   Maxime Ripard <maxime@cerno.tech>
To:     Noralf =?utf-8?Q?Tr=C3=B8nnes?= <noralf@tronnes.org>
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Subject: Re: [PATCH v2 02/33] drm/tests: Add Kunit Helpers
Message-ID: <20220926093612.wvbou2srbo3uinar@houat>
References: <20220728-rpi-analog-tv-properties-v2-0-f733a0ed9f90@cerno.tech>
 <20220728-rpi-analog-tv-properties-v2-2-f733a0ed9f90@cerno.tech>
 <3f7000ab-b845-a7e8-f215-02121da779b7@tronnes.org>
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Hi Noralf,

On Sat, Sep 24, 2022 at 08:06:17PM +0200, Noralf Tr=F8nnes wrote:
> Den 24.09.2022 19.56, skrev Noralf Tr=F8nnes:
> >=20
> >=20
> > 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@cerno.tech>
> >>
> >> diff --git a/drivers/gpu/drm/tests/Makefile b/drivers/gpu/drm/tests/Ma=
kefile
> >> 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) +=3D \
> >>  	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/d=
rm/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 =3D {
> >> +};
> >> +
> >> +static const struct drm_driver drm_mode_driver =3D {
> >> +};
> >> +
> >> +static void drm_kunit_free_device(struct drm_device *drm, void *ptr)
> >> +{
> >> +	struct device *dev =3D 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 =3D root_device_register(name);
> >> +	if (IS_ERR(dev))
> >> +		return ERR_CAST(dev);
> >> +
> >> +	drm =3D drm_dev_alloc(&drm_mode_driver, dev);
> >=20
> > I can't find drm being freed anywhere?
> > Maybe you could assign it to drm->managed.final_kfree.

There's a drm_dev_put in the test_exit hook which should free it.

> Perhaps a better solution would be to use devm_drm_dev_alloc() and
> unregister the root device on exit. That avoids reaching into the drm
> managed internals and it looks more like a regular driver.

But yeah, this is a good idea, I'll do it.

Maxime

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