On 19/10/23 18:21, Harry Wentland wrote:
> Debugging LUT math is much easier when we can unit test
> it. Add kunit functionality to VKMS and add tests for
> - get_lut_index
> - lerp_u16
>
> Signed-off-by: Harry Wentland <harry.wentland@xxxxxxx>
> Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Pekka Paalanen <pekka.paalanen@xxxxxxxxxxxxx>
> Cc: Simon Ser <contact@xxxxxxxxxxx>
> Cc: Harry Wentland <harry.wentland@xxxxxxx>
> Cc: Melissa Wen <mwen@xxxxxxxxxx>
> Cc: Jonas Ådahl <jadahl@xxxxxxxxxx>
> Cc: Sebastian Wick <sebastian.wick@xxxxxxxxxx>
> Cc: Shashank Sharma <shashank.sharma@xxxxxxx>
> Cc: Alexander Goins <agoins@xxxxxxxxxx>
> Cc: Joshua Ashton <joshua@xxxxxxxxx>
> Cc: Michel Dänzer <mdaenzer@xxxxxxxxxx>
> Cc: Aleix Pol <aleixpol@xxxxxxx>
> Cc: Xaver Hugl <xaver.hugl@xxxxxxxxx>
> Cc: Victoria Brekenfeld <victoria@xxxxxxxxxxxx>
> Cc: Sima <daniel@xxxxxxxx>
> Cc: Uma Shankar <uma.shankar@xxxxxxxxx>
> Cc: Naseer Ahmed <quic_naseer@xxxxxxxxxxx>
> Cc: Christopher Braga <quic_cbraga@xxxxxxxxxxx>
> Cc: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
> Cc: Arthur Grillo <arthurgrillo@xxxxxxxxxx>
> Cc: Hector Martin <marcan@xxxxxxxxx>
> Cc: Liviu Dudau <Liviu.Dudau@xxxxxxx>
> Cc: Sasha McIntosh <sashamcintosh@xxxxxxxxxx>
> ---
> drivers/gpu/drm/vkms/Kconfig | 5 ++
> drivers/gpu/drm/vkms/Makefile | 2 +
> drivers/gpu/drm/vkms/tests/.kunitconfig | 4 ++
> drivers/gpu/drm/vkms/tests/Makefile | 4 ++
> drivers/gpu/drm/vkms/tests/vkms_color_tests.c | 64 +++++++++++++++++++
> drivers/gpu/drm/vkms/vkms_composer.c | 4 +-
> drivers/gpu/drm/vkms/vkms_composer.h | 11 ++++
> 7 files changed, 92 insertions(+), 2 deletions(-)
> create mode 100644 drivers/gpu/drm/vkms/tests/.kunitconfig
> create mode 100644 drivers/gpu/drm/vkms/tests/Makefile
> create mode 100644 drivers/gpu/drm/vkms/tests/vkms_color_tests.c
> create mode 100644 drivers/gpu/drm/vkms/vkms_composer.h
>
> diff --git a/drivers/gpu/drm/vkms/Kconfig b/drivers/gpu/drm/vkms/Kconfig
> index 1816562381a2..372cc5fa92f1 100644
> --- a/drivers/gpu/drm/vkms/Kconfig
> +++ b/drivers/gpu/drm/vkms/Kconfig
> @@ -13,3 +13,8 @@ config DRM_VKMS
> a VKMS.
>
> If M is selected the module will be called vkms.
> +
> +config DRM_VKMS_KUNIT_TESTS
> + tristate "Tests for VKMS" if !KUNIT_ALL_TESTS
> + depends on DRM_VKMS && KUNIT
> + default KUNIT_ALL_TESTS
> diff --git a/drivers/gpu/drm/vkms/Makefile b/drivers/gpu/drm/vkms/Makefile
> index 1b28a6a32948..d3440f228f46 100644
> --- a/drivers/gpu/drm/vkms/Makefile
> +++ b/drivers/gpu/drm/vkms/Makefile
> @@ -9,3 +9,5 @@ vkms-y := \
> vkms_writeback.o
>
> obj-$(CONFIG_DRM_VKMS) += vkms.o
> +
> +obj-y += tests/
> \ No newline at end of file
> diff --git a/drivers/gpu/drm/vkms/tests/.kunitconfig b/drivers/gpu/drm/vkms/tests/.kunitconfig
> new file mode 100644
> index 000000000000..70e378228cbd
> --- /dev/null
> +++ b/drivers/gpu/drm/vkms/tests/.kunitconfig
> @@ -0,0 +1,4 @@
> +CONFIG_KUNIT=y
> +CONFIG_DRM=y
> +CONFIG_DRM_VKMS=y
> +CONFIG_DRM_VKMS_KUNIT_TESTS=y
> diff --git a/drivers/gpu/drm/vkms/tests/Makefile b/drivers/gpu/drm/vkms/tests/Makefile
> new file mode 100644
> index 000000000000..761465332ff2
> --- /dev/null
> +++ b/drivers/gpu/drm/vkms/tests/Makefile
> @@ -0,0 +1,4 @@
> +# SPDX-License-Identifier: GPL-2.0+
> +
> +obj-$(CONFIG_DRM_VKMS_KUNIT_TESTS) += \
> + vkms_color_tests.o
> \ No newline at end of file
> diff --git a/drivers/gpu/drm/vkms/tests/vkms_color_tests.c b/drivers/gpu/drm/vkms/tests/vkms_color_tests.c
> new file mode 100644
> index 000000000000..843b2e1d607e
> --- /dev/null
> +++ b/drivers/gpu/drm/vkms/tests/vkms_color_tests.c
> @@ -0,0 +1,64 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +
> +#include <kunit/test.h>
> +
> +#include <drm/drm_fixed.h>
> +
> +#include "../vkms_composer.h"
> +
> +#define TEST_LUT_SIZE 16
> +
> +static struct drm_color_lut test_linear_array[TEST_LUT_SIZE] = {
> + { 0x0, 0x0, 0x0, 0 },
> + { 0x1111, 0x1111, 0x1111, 0 },
> + { 0x2222, 0x2222, 0x2222, 0 },
> + { 0x3333, 0x3333, 0x3333, 0 },
> + { 0x4444, 0x4444, 0x4444, 0 },
> + { 0x5555, 0x5555, 0x5555, 0 },
> + { 0x6666, 0x6666, 0x6666, 0 },
> + { 0x7777, 0x7777, 0x7777, 0 },
> + { 0x8888, 0x8888, 0x8888, 0 },
> + { 0x9999, 0x9999, 0x9999, 0 },
> + { 0xaaaa, 0xaaaa, 0xaaaa, 0 },
> + { 0xbbbb, 0xbbbb, 0xbbbb, 0 },
> + { 0xcccc, 0xcccc, 0xcccc, 0 },
> + { 0xdddd, 0xdddd, 0xdddd, 0 },
> + { 0xeeee, 0xeeee, 0xeeee, 0 },
> + { 0xffff, 0xffff, 0xffff, 0 },
> +};
> +
> +const struct vkms_color_lut test_linear_lut = {
> + .base = test_linear_array,
> + .lut_length = TEST_LUT_SIZE,
> + .channel_value2index_ratio = 0xf000fll
> +};
> +
> +
> +static void vkms_color_test_get_lut_index(struct kunit *test)
> +{
> + int i;
> +
> + KUNIT_EXPECT_EQ(test, drm_fixp2int(get_lut_index(&test_linear_lut, test_linear_array[0].red)), 0);
> +
> + for (i = 0; i < TEST_LUT_SIZE; i++)
> + KUNIT_EXPECT_EQ(test, drm_fixp2int_ceil(get_lut_index(&test_linear_lut, test_linear_array[i].red)), i);
> +}
> +
> +static void vkms_color_test_lerp(struct kunit *test)
> +{
> + KUNIT_EXPECT_EQ(test, lerp_u16(0x0, 0x10, 0x80000000), 0x8);
> +}
> +
> +static struct kunit_case vkms_color_test_cases[] = {
> + KUNIT_CASE(vkms_color_test_get_lut_index),
> + KUNIT_CASE(vkms_color_test_lerp),
> + {}
> +};
> +
> +static struct kunit_suite vkms_color_test_suite = {
> + .name = "vkms-color",
> + .test_cases = vkms_color_test_cases,
> +};
> +kunit_test_suite(vkms_color_test_suite);
> +
> +MODULE_LICENSE("GPL");
> \ No newline at end of file
> diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c
> index 3c99fb8b54e2..a0a3a6fd2926 100644
> --- a/drivers/gpu/drm/vkms/vkms_composer.c
> +++ b/drivers/gpu/drm/vkms/vkms_composer.c
> @@ -91,7 +91,7 @@ static void fill_background(const struct pixel_argb_u16 *background_color,
> }
>
> // lerp(a, b, t) = a + (b - a) * t
> -static u16 lerp_u16(u16 a, u16 b, s64 t)
> +u16 lerp_u16(u16 a, u16 b, s64 t)
> {
> s64 a_fp = drm_int2fixp(a);
> s64 b_fp = drm_int2fixp(b);
> @@ -101,7 +101,7 @@ static u16 lerp_u16(u16 a, u16 b, s64 t)
> return drm_fixp2int(a_fp + delta);
> }
>
> -static s64 get_lut_index(const struct vkms_color_lut *lut, u16 channel_value)
> +s64 get_lut_index(const struct vkms_color_lut *lut, u16 channel_value)
> {
> s64 color_channel_fp = drm_int2fixp(channel_value);
>
> diff --git a/drivers/gpu/drm/vkms/vkms_composer.h b/drivers/gpu/drm/vkms/vkms_composer.h
> new file mode 100644
> index 000000000000..11c5de9cc961
> --- /dev/null
> +++ b/drivers/gpu/drm/vkms/vkms_composer.h
> @@ -0,0 +1,11 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +
> +#ifndef _VKMS_COMPOSER_H_
> +#define _VKMS_COMPOSER_H_
> +
> +#include "vkms_drv.h"
> +
> +s64 get_lut_index(const struct vkms_color_lut *lut, u16 channel_value);
> +u16 lerp_u16(u16 a, u16 b, s64 t);
Not that exposing these functions is inherently wrong, but it might be
better to follow the documentation's suggestion for testing static
functions[0].
[0]: https://www.kernel.org/doc/html/latest/dev-tools/kunit/usage.html#testing-static-functions
Best Regards,
~Arthur Grillo
> +
> +#endif /* _VKMS_COMPOSER_H_ */
> \ No newline at end of file
