linux-kernel - Re: [PATCH v2 1/4] drm/tests: helpers: Add helper for drm_display_mode_from_cea

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Message-ID: <20241016-poised-athletic-adder-ef2998@houat>
Date: Wed, 16 Oct 2024 11:35:13 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Jinjie Ruan <ruanjinjie@...wei.com>
Cc: maarten.lankhorst@...ux.intel.com, tzimmermann@...e.de, 
	airlied@...il.com, simona@...ll.ch, christian.koenig@....com, ray.huang@....com, 
	dmitry.baryshkov@...aro.org, dave.stevenson@...pberrypi.com, mcanal@...lia.com, 
	quic_jjohnson@...cinc.com, skhan@...uxfoundation.org, davidgow@...gle.com, 
	karolina.stolarek@...el.com, Arunpravin.PaneerSelvam@....com, 
	thomas.hellstrom@...ux.intel.com, asomalap@....com, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] drm/tests: helpers: Add helper for
 drm_display_mode_from_cea_vic()

On Mon, Oct 14, 2024 at 08:52:01PM GMT, Jinjie Ruan wrote:
> As Maxime suggested, add a new helper
> drm_kunit_helper_display_mode_from_cea_vic(), it can replace
> the direct call of drm_display_mode_from_cea_vic(), and it will
> help solving the `mode` memory leaks.
> 
> Suggested-by: Maxime Ripard <mripard@...nel.org>
> Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
> ---
>  drivers/gpu/drm/tests/drm_kunit_helpers.c | 40 +++++++++++++++++++++++
>  include/drm/drm_kunit_helpers.h           |  6 ++++
>  2 files changed, 46 insertions(+)
> 
> diff --git a/drivers/gpu/drm/tests/drm_kunit_helpers.c b/drivers/gpu/drm/tests/drm_kunit_helpers.c
> index aa62719dab0e..dc70bafcd394 100644
> --- a/drivers/gpu/drm/tests/drm_kunit_helpers.c
> +++ b/drivers/gpu/drm/tests/drm_kunit_helpers.c
> @@ -311,6 +311,46 @@ drm_kunit_helper_create_crtc(struct kunit *test,
>  }
>  EXPORT_SYMBOL_GPL(drm_kunit_helper_create_crtc);
>  
> +static void kunit_action_drm_mode_destroy(void *ptr)
> +{
> +	struct drm_display_mode *mode = ptr;
> +
> +	drm_mode_destroy(NULL, mode);
> +}
> +
> +/**
> + * drm_kunit_helper_display_mode_from_cea_vic() - return a mode for CEA VIC
> +						  for a KUnit test
> + * @test: The test context object
> + * @dev: DRM device
> + * @video_code: CEA VIC of the mode
> + *
> + * Creates a new mode matching the specified CEA VIC for a KUnit test.
> + *
> + * Resources will be cleaned up automatically.
> + *
> + * Returns: A new drm_display_mode on success or NULL on failure
> + */
> +struct drm_display_mode *
> +drm_kunit_helper_display_mode_from_cea_vic(struct kunit *test,
> +					   struct drm_device *dev,
> +					   u8 video_code)
> +{
> +	struct drm_display_mode *mode;
> +	int ret;
> +
> +	mode = drm_display_mode_from_cea_vic(dev, video_code);
> +
> +	ret = kunit_add_action_or_reset(test,
> +					kunit_action_drm_mode_destroy,
> +					mode);
> +	if (ret)
> +		return NULL;
> +
> +	return mode;
> +}
> +EXPORT_SYMBOL_GPL(drm_kunit_helper_display_mode_from_cea_vic);
> +

I think you can drop the "helper" name there, it's usually reserved for
blanket implementation of DRM hooks. This one isn't a hook, so just
calling it drm_kunit_display_mode_from_cea_vic makes a bit more sense to
me.

>  MODULE_AUTHOR("Maxime Ripard <maxime@...no.tech>");
>  MODULE_DESCRIPTION("KUnit test suite helper functions");
>  MODULE_LICENSE("GPL");
> diff --git a/include/drm/drm_kunit_helpers.h b/include/drm/drm_kunit_helpers.h
> index e7cc17ee4934..1e7fd4be550c 100644
> --- a/include/drm/drm_kunit_helpers.h
> +++ b/include/drm/drm_kunit_helpers.h
> @@ -4,6 +4,7 @@
>  #define DRM_KUNIT_HELPERS_H_
>  
>  #include <drm/drm_drv.h>
> +#include <drm/drm_edid.h>
>
>  #include <linux/device.h>
>  
> @@ -120,4 +121,9 @@ drm_kunit_helper_create_crtc(struct kunit *test,
>  			     const struct drm_crtc_funcs *funcs,
>  			     const struct drm_crtc_helper_funcs *helper_funcs);
>  
> +struct drm_display_mode *
> +drm_kunit_helper_display_mode_from_cea_vic(struct kunit *test,
> +					   struct drm_device *dev,
> +					   u8 video_code);

It's not clear to me what you need the drm_edid header, you just return
a drm_display_mode pointer so you can just forward declare the structure

Once fixed
Acked-by: Maxime Ripard <mripard@...nel.org>

Maxime

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