[igt-dev] [PATCH i-g-t] tests/i915/kms_flip_tiling: Handle lost flip event

[Govindapillai, Vinod]

On Fri, 2022-01-21 at 17:07 +0200, Juha-Pekka Heikkila wrote:
> If test fails to receive flip event within 50ms time period
> running test as well as all following subtests will fail.
> Fix actually failing test to be only one to be flagged and
> following subtests will not be affected by previous failure.
> 
> Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>

Looks good to me.

Reviewed-by: Vinod Govindapillai <vinod.govindapillai at intel.com>

> ---
>  tests/i915/kms_flip_tiling.c | 40 ++++++++++++++++++++++++++++++++
> ----
>  1 file changed, 36 insertions(+), 4 deletions(-)
> 
> diff --git a/tests/i915/kms_flip_tiling.c
> b/tests/i915/kms_flip_tiling.c
> index 913657993..ba9ff46ed 100644
> --- a/tests/i915/kms_flip_tiling.c
> +++ b/tests/i915/kms_flip_tiling.c
> @@ -39,7 +39,9 @@ typedef struct {
>  	int gen;
>  	uint32_t testformat;
>  	struct igt_fb fb[2];
> +	struct igt_fb old_fb[2];
>  	igt_pipe_crc_t *pipe_crc;
> +	bool flipevent_in_queue; // if test fails may need to handle
> rogue event
>  } data_t;
>  
>  static void pipe_crc_free(data_t *data)
> @@ -71,12 +73,13 @@ static int try_commit(igt_display_t *display)
>  static void
>  test_flip_tiling(data_t *data, enum pipe pipe, igt_output_t *output,
> uint64_t modifier[2])
>  {
> -	struct igt_fb old_fb[2] = { data->fb[0], data->fb[1] };
>  	drmModeModeInfo *mode;
>  	igt_plane_t *primary;
>  	igt_crc_t reference_crc, crc;
>  	int fb_id, ret;
>  
> +	memcpy(&data->old_fb, &data->fb, sizeof(data->fb));
> +
>  	mode = igt_output_get_mode(output);
>  
>  	primary = igt_output_get_plane(output, 0);
> @@ -117,14 +120,16 @@ test_flip_tiling(data_t *data, enum pipe pipe,
> igt_output_t *output, uint64_t mo
>  	 */
>  	igt_require(ret == 0);
>  
> +	data->flipevent_in_queue = true;
>  	kmstest_wait_for_pageflip(data->drm_fd);
> +	data->flipevent_in_queue = false;
>  
>  	/* Get a crc and compare with the reference. */
>  	igt_pipe_crc_get_current(data->drm_fd, data->pipe_crc, &crc);
>  	igt_assert_crc_equal(&reference_crc, &crc);
>  
> -	igt_remove_fb(data->drm_fd, &old_fb[0]);
> -	igt_remove_fb(data->drm_fd, &old_fb[1]);
> +	igt_remove_fb(data->drm_fd, &data->old_fb[0]);
> +	igt_remove_fb(data->drm_fd, &data->old_fb[1]);
>  }
>  
>  static void test_cleanup(data_t *data, enum pipe pipe, igt_output_t
> *output)
> @@ -141,7 +146,31 @@ static void test_cleanup(data_t *data, enum pipe
> pipe, igt_output_t *output)
>  	igt_remove_fb(data->drm_fd, &data->fb[1]);
>  }
>  
> -static data_t data;
> +static void handle_lost_event(data_t *data) {
> +	// wait for max 5 seconds in case hit swapping or similar in
> progress.
> +	drmEventContext evctx = { .version = 2 };
> +	struct timeval timeout = { .tv_sec = 5};
> +	fd_set fds;
> +	int ret;
> +
> +	FD_ZERO(&fds);
> +	FD_SET(data->drm_fd, &fds);
> +	do {
> +		errno = 0;
> +		ret = select(data->drm_fd + 1, &fds, NULL, NULL,
> &timeout);
> +	} while (ret < 0 && errno == EINTR);
> +
> +	// TODO: if still failed may need to reset/restart everything
> to
> +	// avoid consecutive tests failing.
> +
> +	igt_assert(drmHandleEvent(data->drm_fd, &evctx) == 0);
> +
> +	data->flipevent_in_queue = false;
> +	igt_remove_fb(data->drm_fd, &data->old_fb[0]);
> +	igt_remove_fb(data->drm_fd, &data->old_fb[1]);
> +}
> +
> +static data_t data = {};
>  igt_output_t *output;
>  
>  igt_main
> @@ -189,6 +218,9 @@ igt_main
>  						      igt_fb_modifier_n
> ame(modifier[0]),
>  						      igt_fb_modifier_n
> ame(modifier[1]))
>  						test_flip_tiling(&data,
> pipe, output, modifier);
> +
> +					if (data.flipevent_in_queue)
> +						handle_lost_event(&data
> );
>  				}
>  			}
>  			test_cleanup(&data, pipe, output);
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