[igt-dev] [PATCH V5 i-g-t] tests/kms_flip: Skip VBlank tests in modules without VBlank

[Ville Syrjälä]

On Sat, Mar 16, 2019 at 11:00:23AM -0300, Rodrigo Siqueira wrote:
> The kms_flip test relies on VBlank support, and this situation may
> exclude some virtual drivers to take advantage of this set of tests.
> This commit adds a mechanism that checks if a module has VBlank. If the
> target module has VBlank support, kms_flip will run all the VBlank
> tests; otherwise, the VBlank tests will be skipped. Additionally, this
> commit improves the test coverage by checks if the function
> drmWaitVBlank() returns EOPNOTSUPP (i.e., no VBlank support).
> 
> V4: Replace DRM_VBLANK_ABSOLUTE by DRM_VBLANK_RELATIVE and
> DRM_VBLANK_NEXTONMISS
> 
> V3: Add documentation (Daniel Vetter)
> 
> V2: Add new branch coverage to check if VBlank is enabled or not and
> update commit message
> 
> V1: Chris Wilson
>   - Change function name from igt_there_is_vblank to kms_has_vblank
>   - Move vblank function check from igt_aux to igt_kms
>   - Utilizes memset in dummy_vbl variable
>   - Directly return the result of drmWaitVBlank()
> 
> Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo at gmail.com>
> ---
>  lib/igt_kms.c    | 20 ++++++++++++++++++++
>  lib/igt_kms.h    |  2 ++
>  tests/kms_flip.c | 22 ++++++++++++++++++++++
>  3 files changed, 44 insertions(+)
> 
> diff --git a/lib/igt_kms.c b/lib/igt_kms.c
> index e1eacc1e..1d2d7188 100644
> --- a/lib/igt_kms.c
> +++ b/lib/igt_kms.c
> @@ -1655,6 +1655,26 @@ void igt_assert_plane_visible(int fd, enum pipe pipe, bool visibility)
>  	igt_assert_eq(visible, visibility);
>  }
>  
> +/**
> + * kms_has_vblank:
> + * @fd: DRM fd
> + *
> + * Get the VBlank errno after an attempt to call drmWaitVBlank(). This
> + * function is useful for checking if a driver has support or not for VBlank.
> + *
> + * Returns: true if target driver has VBlank support, otherwise return false.
> + */
> +bool kms_has_vblank(int fd)
> +{
> +	drmVBlank dummy_vbl;
> +
> +	memset(&dummy_vbl, 0, sizeof(drmVBlank));
> +	dummy_vbl.request.type = DRM_VBLANK_RELATIVE | DRM_VBLANK_NEXTONMISS;

Why the NEXTONMISS?

> +
> +	drmWaitVBlank(fd, &dummy_vbl);
> +	return (errno != EOPNOTSUPP);
> +}
> +
>  /*
>   * A small modeset API
>   */
> diff --git a/lib/igt_kms.h b/lib/igt_kms.h
> index 407f3d64..1cc15eea 100644
> --- a/lib/igt_kms.h
> +++ b/lib/igt_kms.h
> @@ -230,6 +230,8 @@ void kmstest_wait_for_pageflip(int fd);
>  unsigned int kmstest_get_vblank(int fd, int pipe, unsigned int flags);
>  void igt_assert_plane_visible(int fd, enum pipe pipe, bool visibility);
>  
> +bool kms_has_vblank(int fd);
> +
>  /*
>   * A small modeset API
>   */
> diff --git a/tests/kms_flip.c b/tests/kms_flip.c
> index dfa5a69e..614efc5b 100755
> --- a/tests/kms_flip.c
> +++ b/tests/kms_flip.c
> @@ -71,6 +71,7 @@
>  #define TEST_SUSPEND		(1 << 26)
>  #define TEST_BO_TOOBIG		(1 << 28)
>  
> +#define TEST_NO_VBLANK		(1 << 29)
>  #define TEST_BASIC		(1 << 30)
>  
>  #define EVENT_FLIP		(1 << 0)
> @@ -126,6 +127,18 @@ struct event_state {
>  	int seq_step;
>  };
>  
> +static bool vblank_dependence(int flags)
> +{
> +	int vblank_flags = TEST_VBLANK | TEST_VBLANK_BLOCK |
> +			   TEST_VBLANK_ABSOLUTE | TEST_VBLANK_EXPIRED_SEQ |
> +			   TEST_CHECK_TS | TEST_VBLANK_RACE;
> +
> +	if (flags & vblank_flags)
> +		return true;
> +
> +	return false;
> +}
> +
>  static float timeval_float(const struct timeval *tv)
>  {
>  	return tv->tv_sec + tv->tv_usec / 1000000.0f;
> @@ -1177,6 +1190,7 @@ static void run_test_on_crtc_set(struct test_output *o, int *crtc_idxs,
>  	unsigned bo_size = 0;
>  	uint64_t tiling;
>  	int i;
> +	int vblank = true;
>  
>  	switch (crtc_count) {
>  	case RUN_TEST:
> @@ -1260,6 +1274,14 @@ static void run_test_on_crtc_set(struct test_output *o, int *crtc_idxs,
>  	}
>  	igt_assert(fb_is_bound(o, o->fb_ids[0]));
>  
> +	vblank = kms_has_vblank(drm_fd);
> +	if (!vblank) {
> +		if (vblank_dependence(o->flags))
> +			igt_require_f(vblank, "There is no VBlank\n");
> +		else
> +			o->flags |= TEST_NO_VBLANK;
> +	}
> +
>  	/* quiescent the hw a bit so ensure we don't miss a single frame */
>  	if (o->flags & TEST_CHECK_TS)
>  		calibrate_ts(o, crtc_idxs[0]);
> -- 
> 2.21.0
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-- 
Ville Syrjälä
Intel