[igt-dev] [PATCH i-g-t] tests/kms_big_fb: Add over 32k HW stride tests

[Juha-Pekka Heikkila]

On 23.9.2019 15.43, Ville Syrjälä wrote:
> On Mon, Sep 23, 2019 at 01:40:33PM +0300, Juha-Pekka Heikkila wrote:
>> On ICL when using 64bpp formats strides can reach up to
>> 64k. These test try exact maximum HW strides so gtt
>> remapping will not come in play.
>>
>> Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>
>> ---
>>   tests/kms_big_fb.c | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++++
>>   1 file changed, 103 insertions(+)
> 
> I believe all you should need is something like:
> 
> --- a/tests/kms_big_fb.c
> +++ b/tests/kms_big_fb.c
> @@ -161,9 +161,6 @@ static void max_fb_size(data_t *data, int *width, int *height,
>   	uint64_t size;
>   	int i = 0;
>   
> -	*width = data->max_fb_width;
> -	*height = data->max_fb_height;
> -
>   	/* max fence stride is only 8k bytes on gen3 */
>   	if (intel_gen(data->devid) < 4 &&
>   	    format == DRM_FORMAT_XRGB8888)
> @@ -415,8 +412,16 @@ static bool test_pipe(data_t *data)
>   	return ret;
>   }
>   
> -static void test_scanout(data_t *data)
> +static void test_scanout(data_t *data, bool test_max_hw_stride)
>   {
> +	if (test_max_hw_stride) {
> +		data->big_fb_width = BIG;
> +		data->big_fb_height = BIG;
> +	} else {
> +		data->big_fb_width = data->max_fb_width;
> +		data->big_fb_height = data->max_fb_height;
> +	}
> +
>   	max_fb_size(data, &data->big_fb_width, &data->big_fb_height,
>   		    data->format, data->modifier);
>   
> 

Doing test this way will try 'bunch of coordinates pulled out of thin 
air' (as stated in the code :) ) but my version tries the explicit 
maximum limits with idea if that works then any other coordinate would 
work as well.