[PATCH v5 2/5] drm/tests: Add test cases for drm_rect_calc_hscale()

[Maíra Canal]

On 4/18/23 20:01, Arthur Grillo wrote:
> Insert parameterized test for the drm_rect_calc_hscale() to ensure
> correctness and prevent future regressions. Besides the test for the
> usual case, tests the exceptions.
> 
> Signed-off-by: Arthur Grillo <arthurgrillo at riseup.net>

Thanks for the quick fix!

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

Best Regards,
- Maíra Canal

> ---
>   drivers/gpu/drm/tests/drm_rect_test.c | 72 +++++++++++++++++++++++++++
>   1 file changed, 72 insertions(+)
> 
> diff --git a/drivers/gpu/drm/tests/drm_rect_test.c b/drivers/gpu/drm/tests/drm_rect_test.c
> index 33584f63be37..aae682ad9ee1 100644
> --- a/drivers/gpu/drm/tests/drm_rect_test.c
> +++ b/drivers/gpu/drm/tests/drm_rect_test.c
> @@ -10,6 +10,7 @@
>   #include <drm/drm_rect.h>
>   
>   #include <linux/string_helpers.h>
> +#include <linux/errno.h>
>   
>   static void drm_rect_compare(struct kunit *test, const struct drm_rect *r,
>   			     const struct drm_rect *expected)
> @@ -343,12 +344,83 @@ static void drm_test_rect_intersect(struct kunit *test)
>   	drm_rect_compare(test, &r1_aux, &params->expected_intersection);
>   }
>   
> +struct drm_rect_scale_case {
> +	const char *name;
> +	struct drm_rect src, dst;
> +	int min_range, max_range;
> +	int expected_scaling_factor;
> +};
> +
> +static const struct drm_rect_scale_case drm_rect_scale_cases[] = {
> +	{
> +		.name = "normal use",
> +		.src = DRM_RECT_INIT(0, 0, 2 << 16, 2 << 16),
> +		.dst = DRM_RECT_INIT(0, 0, 1 << 16, 1 << 16),
> +		.min_range = 0, .max_range = INT_MAX,
> +		.expected_scaling_factor = 2,
> +	},
> +	{
> +		.name = "out of max range",
> +		.src = DRM_RECT_INIT(0, 0, 10 << 16, 10 << 16),
> +		.dst = DRM_RECT_INIT(0, 0, 1 << 16, 1 << 16),
> +		.min_range = 3, .max_range = 5,
> +		.expected_scaling_factor = -ERANGE,
> +	},
> +	{
> +		.name = "out of min range",
> +		.src = DRM_RECT_INIT(0, 0, 2 << 16, 2 << 16),
> +		.dst = DRM_RECT_INIT(0, 0, 1 << 16, 1 << 16),
> +		.min_range = 3, .max_range = 5,
> +		.expected_scaling_factor = -ERANGE,
> +	},
> +	{
> +		.name = "zero dst",
> +		.src = DRM_RECT_INIT(0, 0, 2 << 16, 2 << 16),
> +		.dst = DRM_RECT_INIT(0, 0, 0 << 16, 0 << 16),
> +		.min_range = 0, .max_range = INT_MAX,
> +		.expected_scaling_factor = 0,
> +	},
> +	{
> +		.name = "negative src",
> +		.src = DRM_RECT_INIT(0, 0, -(1 << 16), -(1 << 16)),
> +		.dst = DRM_RECT_INIT(0, 0, 1 << 16, 1 << 16),
> +		.min_range = 0, .max_range = INT_MAX,
> +		.expected_scaling_factor = -EINVAL,
> +	},
> +	{
> +		.name = "negative dst",
> +		.src = DRM_RECT_INIT(0, 0, 1 << 16, 1 << 16),
> +		.dst = DRM_RECT_INIT(0, 0, -(1 << 16), -(1 << 16)),
> +		.min_range = 0, .max_range = INT_MAX,
> +		.expected_scaling_factor = -EINVAL,
> +	},
> +};
> +
> +static void drm_rect_scale_case_desc(const struct drm_rect_scale_case *t, char *desc)
> +{
> +	strscpy(desc, t->name, KUNIT_PARAM_DESC_SIZE);
> +}
> +
> +KUNIT_ARRAY_PARAM(drm_rect_scale, drm_rect_scale_cases, drm_rect_scale_case_desc);
> +
> +static void drm_test_rect_calc_hscale(struct kunit *test)
> +{
> +	const struct drm_rect_scale_case *params = test->param_value;
> +	int scaling_factor;
> +
> +	scaling_factor = drm_rect_calc_hscale(&params->src, &params->dst,
> +					      params->min_range, params->max_range);
> +
> +	KUNIT_EXPECT_EQ(test, scaling_factor, params->expected_scaling_factor);
> +}
> +
>   static struct kunit_case drm_rect_tests[] = {
>   	KUNIT_CASE(drm_test_rect_clip_scaled_div_by_zero),
>   	KUNIT_CASE(drm_test_rect_clip_scaled_not_clipped),
>   	KUNIT_CASE(drm_test_rect_clip_scaled_clipped),
>   	KUNIT_CASE(drm_test_rect_clip_scaled_signed_vs_unsigned),
>   	KUNIT_CASE_PARAM(drm_test_rect_intersect, drm_rect_intersect_gen_params),
> +	KUNIT_CASE_PARAM(drm_test_rect_calc_hscale, drm_rect_scale_gen_params),
>   	{ }
>   };
>