linux-kernel - Re: [RFC PATCH 1/1] drm/format-helper: Add KUnit tests for drm_fb_xrgb8888_to

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Date:   Mon, 30 May 2022 18:29:03 +0200
From:   José Expósito <jose.exposito89@...il.com>
To:     Maxime Ripard <maxime@...no.tech>, kunit-dev@...glegroups.com
Cc:     javierm@...hat.com, tzimmermann@...e.de,
        maarten.lankhorst@...ux.intel.com, airlied@...ux.ie,
        daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/1] drm/format-helper: Add KUnit tests for
 drm_fb_xrgb8888_to_rgb332()

Hi Maxime,

On Mon, May 30, 2022 at 03:11:58PM +0200, Maxime Ripard wrote:
> 
> Hi,
> 
> On Mon, May 30, 2022 at 12:20:17PM +0200, José Expósito wrote:
> > Test the conversion from XRGB8888 to RGB332.
> > 
> > What is tested?
> > 
> >  - Different values for the X in XRGB8888 to make sure it is ignored
> >  - Different clip values: Single pixel and full and partial buffer
> >  - Well know colors: White, black, red, green, blue, magenta, yellow
> >    and cyan
> >  - Other colors: Randomly picked
> >  - Destination pitch
> > 
> > Suggested-by: Javier Martinez Canillas <javierm@...hat.com>
> > Signed-off-by: José Expósito <jose.exposito89@...il.com>
> 
> It looks mostly good to me, but I think we should Cc
> kunit-dev@...glegroups.com to have their feedback.

Thanks a lot for the quick feedback.

I just cc'ed kunit-dev@...glegroups.com. For anyone joining the
conversation, here is the link to the patch and the cover letter with
some questions:

https://lore.kernel.org/dri-devel/20220530102017.471865-1-jose.exposito89@gmail.com/T/

> 
> > ---
> >  drivers/gpu/drm/Kconfig                  |  12 ++
> >  drivers/gpu/drm/Makefile                 |   3 +
> >  drivers/gpu/drm/drm_format_helper_test.c | 166 +++++++++++++++++++++++
> >  3 files changed, 181 insertions(+)
> >  create mode 100644 drivers/gpu/drm/drm_format_helper_test.c
> > 
> > diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> > index e88c497fa010..d92be6faef15 100644
> > --- a/drivers/gpu/drm/Kconfig
> > +++ b/drivers/gpu/drm/Kconfig
> > @@ -76,6 +76,18 @@ config DRM_KMS_HELPER
> >  	help
> >  	  CRTC helpers for KMS drivers. 
> >  
> > +config DRM_FORMAR_HELPER_TEST
> > +	bool "drm_format_helper tests" if !KUNIT_ALL_TESTS
> > +	depends on DRM && KUNIT=y
> > +	select DRM_KMS_HELPER
> > +	default KUNIT_ALL_TESTS
> > +	help
> > +	  KUnit tests for the drm_format_helper APIs. This option is not
> > +	  useful for distributions or general kernels, but only for kernel
> > +	  developers working on DRM and associated drivers.
> > +
> > +	  If in doubt, say "N".
> > +
> 
> AFAIK, kunit test cases are supposed to have a .kunitconfig too to
> enable the kunit tests easily.
> 
> Maxime

A .kuniconfig example is present in the cover letter. My understanding
from the docs:

https://docs.kernel.org/dev-tools/kunit/run_wrapper.html#create-a-kunitconfig-file

Is that, like the .config file, the .kunitconfig file is not meant to
be included in git, but I'm sure someone else will clarify this point.

Thanks again,
José Expósito