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Date: Mon, 26 Feb 2024 09:24:38 -0300
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Subject: Re: [PATCH v7 03/36] drm/tests: Add helper to create mock plane
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To: Maxime Ripard <mripard@kernel.org>,
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
 Thomas Zimmermann <tzimmermann@suse.de>, David Airlie <airlied@gmail.com>,
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 Sandy Huang <hjc@rock-chips.com>, =?UTF-8?Q?Heiko_St=C3=BCbner?=
 <heiko@sntech.de>, Chen-Yu Tsai <wens@csie.org>,
 Jernej Skrabec <jernej.skrabec@gmail.com>,
 Samuel Holland <samuel@sholland.org>
Cc: Hans Verkuil <hverkuil@xs4all.nl>,
 Sebastian Wick <sebastian.wick@redhat.com>,
 =?UTF-8?B?VmlsbGUgU3lyasOkbMOk?= <ville.syrjala@linux.intel.com>,
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References: <20240222-kms-hdmi-connector-state-v7-0-8f4af575fce2@kernel.org>
 <20240222-kms-hdmi-connector-state-v7-3-8f4af575fce2@kernel.org>
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On 2/22/24 15:13, Maxime Ripard wrote:
> We're going to need a full-blown, functional, KMS device to test more
> components of the atomic modesetting infrastructure.
> 
> Let's add a new helper to create a dumb, mocked, primary plane. By
> default, it will create a linear XRGB8888 plane, using the default
> helpers.
> 
> Signed-off-by: Maxime Ripard <mripard@kernel.org>

Reviewed-by: Maíra Canal <mcanal@igalia.com>

Best Regards,
- Maíra

> ---
>   drivers/gpu/drm/tests/drm_kunit_helpers.c | 85 +++++++++++++++++++++++++++++++
>   include/drm/drm_kunit_helpers.h           | 11 ++++
>   2 files changed, 96 insertions(+)
> 
> diff --git a/drivers/gpu/drm/tests/drm_kunit_helpers.c b/drivers/gpu/drm/tests/drm_kunit_helpers.c
> index 4fb11b938bc1..32dc8354641a 100644
> --- a/drivers/gpu/drm/tests/drm_kunit_helpers.c
> +++ b/drivers/gpu/drm/tests/drm_kunit_helpers.c
> @@ -3,6 +3,7 @@
>   #include <drm/drm_atomic.h>
>   #include <drm/drm_atomic_helper.h>
>   #include <drm/drm_drv.h>
> +#include <drm/drm_fourcc.h>
>   #include <drm/drm_kunit_helpers.h>
>   #include <drm/drm_managed.h>
>   
> @@ -164,5 +165,89 @@ drm_kunit_helper_atomic_state_alloc(struct kunit *test,
>   }
>   EXPORT_SYMBOL_GPL(drm_kunit_helper_atomic_state_alloc);
>   
> +static const uint32_t default_plane_formats[] = {
> +	DRM_FORMAT_XRGB8888,
> +};
> +
> +static const uint64_t default_plane_modifiers[] = {
> +	DRM_FORMAT_MOD_LINEAR,
> +	DRM_FORMAT_MOD_INVALID
> +};
> +
> +static const struct drm_plane_helper_funcs default_plane_helper_funcs = {
> +};
> +
> +static const struct drm_plane_funcs default_plane_funcs = {
> +	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
> +	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
> +	.reset			= drm_atomic_helper_plane_reset,
> +};
> +
> +/**
> + * drm_kunit_helper_create_primary_plane - Creates a mock primary plane for a KUnit test
> + * @test: The test context object
> + * @drm: The device to alloc the plane for
> + * @funcs: Callbacks for the new plane. Optional.
> + * @helper_funcs: Helpers callbacks for the new plane. Optional.
> + * @formats: array of supported formats (DRM_FORMAT\_\*). Optional.
> + * @num_formats: number of elements in @formats
> + * @modifiers: array of struct drm_format modifiers terminated by
> + *             DRM_FORMAT_MOD_INVALID. Optional.
> + *
> + * This allocates and initializes a mock struct &drm_plane meant to be
> + * part of a mock device for a KUnit test.
> + *
> + * Resources will be cleaned up automatically.
> + *
> + * @funcs will default to the default helpers implementations.
> + * @helper_funcs will default to an empty implementation. @formats will
> + * default to XRGB8888 only. @modifiers will default to a linear
> + * modifier only.
> + *
> + * Returns:
> + * A pointer to the new plane, or an ERR_PTR() otherwise.
> + */
> +struct drm_plane *
> +drm_kunit_helper_create_primary_plane(struct kunit *test,
> +				      struct drm_device *drm,
> +				      const struct drm_plane_funcs *funcs,
> +				      const struct drm_plane_helper_funcs *helper_funcs,
> +				      const uint32_t *formats,
> +				      unsigned int num_formats,
> +				      const uint64_t *modifiers)
> +{
> +	struct drm_plane *plane;
> +
> +	if (!funcs)
> +		funcs = &default_plane_funcs;
> +
> +	if (!helper_funcs)
> +		helper_funcs = &default_plane_helper_funcs;
> +
> +	if (!formats || !num_formats) {
> +		formats = default_plane_formats;
> +		num_formats = ARRAY_SIZE(default_plane_formats);
> +	}
> +
> +	if (!modifiers)
> +		modifiers = default_plane_modifiers;
> +
> +	plane = __drmm_universal_plane_alloc(drm,
> +					     sizeof(struct drm_plane), 0,
> +					     0,
> +					     funcs,
> +					     formats,
> +					     num_formats,
> +					     default_plane_modifiers,
> +					     DRM_PLANE_TYPE_PRIMARY,
> +					     NULL);
> +	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, plane);
> +
> +	drm_plane_helper_add(plane, helper_funcs);
> +
> +	return plane;
> +}
> +EXPORT_SYMBOL_GPL(drm_kunit_helper_create_primary_plane);
> +
>   MODULE_AUTHOR("Maxime Ripard <maxime@cerno.tech>");
>   MODULE_LICENSE("GPL");
> diff --git a/include/drm/drm_kunit_helpers.h b/include/drm/drm_kunit_helpers.h
> index 3ae19892229d..38667d624aa8 100644
> --- a/include/drm/drm_kunit_helpers.h
> +++ b/include/drm/drm_kunit_helpers.h
> @@ -10,6 +10,8 @@
>   #include <kunit/test.h>
>   
>   struct drm_device;
> +struct drm_plane_funcs;
> +struct drm_plane_helper_funcs;
>   struct kunit;
>   
>   struct device *drm_kunit_helper_alloc_device(struct kunit *test);
> @@ -99,4 +101,13 @@ drm_kunit_helper_atomic_state_alloc(struct kunit *test,
>   				    struct drm_device *drm,
>   				    struct drm_modeset_acquire_ctx *ctx);
>   
> +struct drm_plane *
> +drm_kunit_helper_create_primary_plane(struct kunit *test,
> +				      struct drm_device *drm,
> +				      const struct drm_plane_funcs *funcs,
> +				      const struct drm_plane_helper_funcs *helper_funcs,
> +				      const uint32_t *formats,
> +				      unsigned int num_formats,
> +				      const uint64_t *modifiers);
> +
>   #endif // DRM_KUNIT_HELPERS_H_
>