On 08/11/23 13:36, 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
>
> v3:
> - Use include way of testing static functions (Arthur)
>
> Signed-off-by: Harry Wentland <harry.wentland@xxxxxxx>
> Cc: Arthur Grillo <arthurgrillo@xxxxxxxxxx>
> ---
> drivers/gpu/drm/vkms/Kconfig | 5 ++
> drivers/gpu/drm/vkms/tests/.kunitconfig | 4 ++
> drivers/gpu/drm/vkms/tests/vkms_color_tests.c | 62 +++++++++++++++++++
> drivers/gpu/drm/vkms/vkms_composer.c | 8 ++-
> 4 files changed, 77 insertions(+), 2 deletions(-)
> create mode 100644 drivers/gpu/drm/vkms/tests/.kunitconfig
> create mode 100644 drivers/gpu/drm/vkms/tests/vkms_color_tests.c
>
> diff --git a/drivers/gpu/drm/vkms/Kconfig b/drivers/gpu/drm/vkms/Kconfig
> index b9ecdebecb0b..c1f8b343ff0e 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/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/vkms_color_tests.c b/drivers/gpu/drm/vkms/tests/vkms_color_tests.c
> new file mode 100644
> index 000000000000..b995114cf6b8
> --- /dev/null
> +++ b/drivers/gpu/drm/vkms/tests/vkms_color_tests.c
> @@ -0,0 +1,62 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +
> +#include <kunit/test.h>
> +
> +#include <drm/drm_fixed.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..6f942896036e 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)
Now you don't need to remove the static keyword.
> {
> 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)
DITTO
Best Regards,
~Arthur Grillo
> {
> s64 color_channel_fp = drm_int2fixp(channel_value);
>
> @@ -429,3 +429,7 @@ int vkms_set_crc_source(struct drm_crtc *crtc, const char *src_name)
>
> return ret;
> }
> +
> +#ifdef CONFIG_DRM_VKMS_KUNIT_TESTS
> +#include "tests/vkms_color_tests.c"
> +#endif
