[igt-dev] [PATCH i-g-t] tests/kms_concurrent: Test for maximum number of planes

[Juha-Pekka Heikkila]

Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>

On 19.3.2020 13.42, Mika Kahola wrote:
> In some cases we ran out of bandwidth when executiong a test.
> An error such as this can be seen on dmesg
> 
> "Bandwidth 16632 MB/s exceeds max available 6553 MB/s (7 active planes)"
> 
> The patch tests first, how many planes the platform can support with
> the given resolution. The actual test is then performed by using the
> calculated maximum number of planes instead of maximum number of planes
> that the platform supports.
> 
> Signed-off-by: Mika Kahola <mika.kahola at intel.com>
> ---
>   tests/kms_concurrent.c | 15 +++++++++------
>   1 file changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/tests/kms_concurrent.c b/tests/kms_concurrent.c
> index 14ca5fab..61137139 100644
> --- a/tests/kms_concurrent.c
> +++ b/tests/kms_concurrent.c
> @@ -196,20 +196,19 @@ prepare_planes(data_t *data, enum pipe pipe, int max_planes,
>   }
>   
>   static void
> -test_plane_position_with_output(data_t *data, enum pipe pipe, igt_output_t *output)
> +test_plane_position_with_output(data_t *data, enum pipe pipe, int max_planes,
> +				igt_output_t *output)
>   {
>   	int i;
>   	int iterations = opt.iterations < 1 ? 1 : opt.iterations;
>   	bool loop_forever = opt.iterations == LOOP_FOREVER ? true : false;
> -	int max_planes = data->display.pipes[pipe].n_planes;
>   
>   	igt_pipe_refresh(&data->display, pipe, true);
>   
>   	i = 0;
>   	while (i < iterations || loop_forever) {
>   		prepare_planes(data, pipe, max_planes, output);
> -		igt_display_commit2(&data->display, COMMIT_ATOMIC);
> -
> +		igt_display_try_commit2(&data->display, COMMIT_ATOMIC);
>   		i++;
>   	}
>   }
> @@ -242,7 +241,7 @@ get_lowres_mode(data_t *data, const drmModeModeInfo *mode_default,
>   	return mode;
>   }
>   
> -static void
> +static int
>   test_resolution_with_output(data_t *data, enum pipe pipe, igt_output_t *output)
>   {
>   	const drmModeModeInfo *mode_hi, *mode_lo;
> @@ -294,6 +293,8 @@ test_resolution_with_output(data_t *data, enum pipe pipe, igt_output_t *output)
>   
>   		i++;
>   	}
> +
> +	return max_planes;
>   }
>   
>   static void
> @@ -301,6 +302,7 @@ run_test(data_t *data, enum pipe pipe, igt_output_t *output)
>   {
>   	int connected_outs;
>   	int n_planes = data->display.pipes[pipe].n_planes;
> +	int max_planes = n_planes;
>   
>   	if (!opt.user_seed)
>   		opt.seed = time(NULL);
> @@ -311,9 +313,10 @@ run_test(data_t *data, enum pipe pipe, igt_output_t *output)
>   			 igt_output_name(output), kmstest_pipe_name(pipe), opt.seed);
>   
>   		test_init(data, pipe, n_planes, output);
> +		max_planes = test_resolution_with_output(data, pipe, output);
>   
>   		igt_fork(child, 1) {
> -			test_plane_position_with_output(data, pipe, output);
> +			test_plane_position_with_output(data, pipe, max_planes, output);
>   		}
>   
>   		test_resolution_with_output(data, pipe, output);
>