[PATCH V8 i-g-t] tests/kms_flip: Skip VBlank tests in modules without VBlank

[PATCH V8 i-g-t] tests/kms_flip: Skip VBlank tests in modules without VBlank

[Rodrigo Siqueira]

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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).

V7: Changes since V6
 - Skip TEST_DPMS with TEST_MODESET and TEST_EBUSY if the device does
   not support vblank

V6: Set errno to zero before call drmWaitVBlank() (Chris Wilson)

V5: Drop the DRM_VBLANK_NEXTONMISS (Chris Wilson)

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@gmail.com>
---
 lib/igt_kms.c    | 21 +++++++++++++++++++++
 lib/igt_kms.h    |  2 ++
 tests/kms_flip.c | 24 +++++++++++++++++++++++-
 3 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index d7d711a7..8a465f67 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -1673,6 +1673,27 @@ void igt_assert_plane_visible(int fd, enum pipe pipe, int plane_index, bool visi
 	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;
+
+	errno = 0;
+	drmWaitVBlank(fd, &dummy_vbl);
+	return (errno != EOPNOTSUPP);
+}
+
 /*
  * A small modeset API
  */
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 4ac28131..5b5cf274 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -229,6 +229,8 @@ 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, int plane_index, 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 d7c1f9cf..2a158d97 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 | TEST_EBUSY;
+
+	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;
@@ -494,7 +507,7 @@ static void check_state(const struct test_output *o, const struct event_state *e
 	/* check only valid if no modeset happens in between, that increments by
 	 * (1 << 23) on each step. This bounding matches the one in
 	 * DRM_IOCTL_WAIT_VBLANK. */
-	if (!(o->flags & (TEST_DPMS | TEST_MODESET)))
+	if (!(o->flags & (TEST_DPMS | TEST_MODESET | TEST_NO_VBLANK)))
 		igt_assert_f(es->current_seq - (es->last_seq + o->seq_step) <= 1UL << 23,
 			     "unexpected %s seq %u, should be >= %u\n",
 			     es->name, es->current_seq, es->last_seq + o->seq_step);
@@ -1176,6 +1189,7 @@ static void run_test_on_crtc_set(struct test_output *o, int *crtc_idxs,
 	unsigned bo_size = 0;
 	uint64_t tiling;
 	int i;
+	bool vblank = true;
 
 	switch (crtc_count) {
 	case RUN_TEST:
@@ -1259,6 +1273,14 @@ 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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Re: [PATCH V8 i-g-t] tests/kms_flip: Skip VBlank tests in modules without VBlank

[Ser, Simon]

On Tue, 2019-06-04 at 23:30 -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).
> 
> V7: Changes since V6
>  - Skip TEST_DPMS with TEST_MODESET and TEST_EBUSY if the device does
>    not support vblank

Hmm, I'm not sure I understand this line. If I'm reading this correctly
it refers to this line:

    if (!(o->flags & (TEST_DPMS | TEST_MODESET | TEST_NO_VBLANK)))

So the check was previously skipped on TEST_DPMS and TEST_MODESET. It's
now skipped on TEST_NO_VBLANK too. So I'm a little confused with the
changelog line: should it say "skip seq number checking it the device
doesn't support vblank"?

Am I missing something?

Apart from this, the patch itself looks good to me.

> V6: Set errno to zero before call drmWaitVBlank() (Chris Wilson)
> 
> V5: Drop the DRM_VBLANK_NEXTONMISS (Chris Wilson)
> 
> 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@gmail.com>
> ---
>  lib/igt_kms.c    | 21 +++++++++++++++++++++
>  lib/igt_kms.h    |  2 ++
>  tests/kms_flip.c | 24 +++++++++++++++++++++++-
>  3 files changed, 46 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/igt_kms.c b/lib/igt_kms.c
> index d7d711a7..8a465f67 100644
> --- a/lib/igt_kms.c
> +++ b/lib/igt_kms.c
> @@ -1673,6 +1673,27 @@ void igt_assert_plane_visible(int fd, enum pipe pipe, int plane_index, bool visi
>  	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;
> +
> +	errno = 0;
> +	drmWaitVBlank(fd, &dummy_vbl);
> +	return (errno != EOPNOTSUPP);
> +}
> +
>  /*
>   * A small modeset API
>   */
> diff --git a/lib/igt_kms.h b/lib/igt_kms.h
> index 4ac28131..5b5cf274 100644
> --- a/lib/igt_kms.h
> +++ b/lib/igt_kms.h
> @@ -229,6 +229,8 @@ 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, int plane_index, 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 d7c1f9cf..2a158d97 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 | TEST_EBUSY;
> +
> +	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;
> @@ -494,7 +507,7 @@ static void check_state(const struct test_output *o, const struct event_state *e
>  	/* check only valid if no modeset happens in between, that increments by
>  	 * (1 << 23) on each step. This bounding matches the one in
>  	 * DRM_IOCTL_WAIT_VBLANK. */
> -	if (!(o->flags & (TEST_DPMS | TEST_MODESET)))
> +	if (!(o->flags & (TEST_DPMS | TEST_MODESET | TEST_NO_VBLANK)))
>  		igt_assert_f(es->current_seq - (es->last_seq + o->seq_step) <= 1UL << 23,
>  			     "unexpected %s seq %u, should be >= %u\n",
>  			     es->name, es->current_seq, es->last_seq + o->seq_step);
> @@ -1176,6 +1189,7 @@ static void run_test_on_crtc_set(struct test_output *o, int *crtc_idxs,
>  	unsigned bo_size = 0;
>  	uint64_t tiling;
>  	int i;
> +	bool vblank = true;
>  
>  	switch (crtc_count) {
>  	case RUN_TEST:
> @@ -1259,6 +1273,14 @@ 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]);
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Re: [PATCH V8 i-g-t] tests/kms_flip: Skip VBlank tests in modules without VBlank

[Rodrigo Siqueira]

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On 06/06, Ser, Simon wrote:
> On Tue, 2019-06-04 at 23:30 -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).
> > 
> > V7: Changes since V6
> >  - Skip TEST_DPMS with TEST_MODESET and TEST_EBUSY if the device does
> >    not support vblank
> 
> Hmm, I'm not sure I understand this line. If I'm reading this correctly
> it refers to this line:
> 
>     if (!(o->flags & (TEST_DPMS | TEST_MODESET | TEST_NO_VBLANK)))
> 
> So the check was previously skipped on TEST_DPMS and TEST_MODESET. It's
> now skipped on TEST_NO_VBLANK too. So I'm a little confused with the
> changelog line: should it say "skip seq number checking it the device
> doesn't support vblank"?
> 
> Am I missing something?
> 
> Apart from this, the patch itself looks good to me.

Hi Simon,

Thank you for your review.

About the changelog message, I'll update it to:

  Skip seq number checking and busy flip if the device doesn't support vblank

Can I add your Reviewed-by before applying this patch?
 
> > V6: Set errno to zero before call drmWaitVBlank() (Chris Wilson)
> > 
> > V5: Drop the DRM_VBLANK_NEXTONMISS (Chris Wilson)
> > 
> > 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@gmail.com>
> > ---
> >  lib/igt_kms.c    | 21 +++++++++++++++++++++
> >  lib/igt_kms.h    |  2 ++
> >  tests/kms_flip.c | 24 +++++++++++++++++++++++-
> >  3 files changed, 46 insertions(+), 1 deletion(-)
> > 
> > diff --git a/lib/igt_kms.c b/lib/igt_kms.c
> > index d7d711a7..8a465f67 100644
> > --- a/lib/igt_kms.c
> > +++ b/lib/igt_kms.c
> > @@ -1673,6 +1673,27 @@ void igt_assert_plane_visible(int fd, enum pipe pipe, int plane_index, bool visi
> >  	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;
> > +
> > +	errno = 0;
> > +	drmWaitVBlank(fd, &dummy_vbl);
> > +	return (errno != EOPNOTSUPP);
> > +}
> > +
> >  /*
> >   * A small modeset API
> >   */
> > diff --git a/lib/igt_kms.h b/lib/igt_kms.h
> > index 4ac28131..5b5cf274 100644
> > --- a/lib/igt_kms.h
> > +++ b/lib/igt_kms.h
> > @@ -229,6 +229,8 @@ 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, int plane_index, 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 d7c1f9cf..2a158d97 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 | TEST_EBUSY;
> > +
> > +	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;
> > @@ -494,7 +507,7 @@ static void check_state(const struct test_output *o, const struct event_state *e
> >  	/* check only valid if no modeset happens in between, that increments by
> >  	 * (1 << 23) on each step. This bounding matches the one in
> >  	 * DRM_IOCTL_WAIT_VBLANK. */
> > -	if (!(o->flags & (TEST_DPMS | TEST_MODESET)))
> > +	if (!(o->flags & (TEST_DPMS | TEST_MODESET | TEST_NO_VBLANK)))
> >  		igt_assert_f(es->current_seq - (es->last_seq + o->seq_step) <= 1UL << 23,
> >  			     "unexpected %s seq %u, should be >= %u\n",
> >  			     es->name, es->current_seq, es->last_seq + o->seq_step);
> > @@ -1176,6 +1189,7 @@ static void run_test_on_crtc_set(struct test_output *o, int *crtc_idxs,
> >  	unsigned bo_size = 0;
> >  	uint64_t tiling;
> >  	int i;
> > +	bool vblank = true;
> >  
> >  	switch (crtc_count) {
> >  	case RUN_TEST:
> > @@ -1259,6 +1273,14 @@ 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]);

-- 
Rodrigo Siqueira
https://siqueira.tech

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Re: [PATCH V8 i-g-t] tests/kms_flip: Skip VBlank tests in modules without VBlank

[Ser, Simon]

On Thu, 2019-06-06 at 12:28 -0300, Rodrigo Siqueira wrote:
> On 06/06, Ser, Simon wrote:
> > On Tue, 2019-06-04 at 23:30 -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).
> > > 
> > > V7: Changes since V6
> > >  - Skip TEST_DPMS with TEST_MODESET and TEST_EBUSY if the device does
> > >    not support vblank
> > 
> > Hmm, I'm not sure I understand this line. If I'm reading this correctly
> > it refers to this line:
> > 
> >     if (!(o->flags & (TEST_DPMS | TEST_MODESET | TEST_NO_VBLANK)))
> > 
> > So the check was previously skipped on TEST_DPMS and TEST_MODESET. It's
> > now skipped on TEST_NO_VBLANK too. So I'm a little confused with the
> > changelog line: should it say "skip seq number checking it the device
> > doesn't support vblank"?
> > 
> > Am I missing something?
> > 
> > Apart from this, the patch itself looks good to me.
> 
> Hi Simon,
> 
> Thank you for your review.
> 
> About the changelog message, I'll update it to:
> 
>   Skip seq number checking and busy flip if the device doesn't support vblank
> 
> Can I add your Reviewed-by before applying this patch?

Yes!

Reviewed-by: Simon Ser <simon.ser@intel.com>

> > > V6: Set errno to zero before call drmWaitVBlank() (Chris Wilson)
> > > 
> > > V5: Drop the DRM_VBLANK_NEXTONMISS (Chris Wilson)
> > > 
> > > 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@gmail.com>
> > > ---
> > >  lib/igt_kms.c    | 21 +++++++++++++++++++++
> > >  lib/igt_kms.h    |  2 ++
> > >  tests/kms_flip.c | 24 +++++++++++++++++++++++-
> > >  3 files changed, 46 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/lib/igt_kms.c b/lib/igt_kms.c
> > > index d7d711a7..8a465f67 100644
> > > --- a/lib/igt_kms.c
> > > +++ b/lib/igt_kms.c
> > > @@ -1673,6 +1673,27 @@ void igt_assert_plane_visible(int fd, enum pipe pipe, int plane_index, bool visi
> > >  	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;
> > > +
> > > +	errno = 0;
> > > +	drmWaitVBlank(fd, &dummy_vbl);
> > > +	return (errno != EOPNOTSUPP);
> > > +}
> > > +
> > >  /*
> > >   * A small modeset API
> > >   */
> > > diff --git a/lib/igt_kms.h b/lib/igt_kms.h
> > > index 4ac28131..5b5cf274 100644
> > > --- a/lib/igt_kms.h
> > > +++ b/lib/igt_kms.h
> > > @@ -229,6 +229,8 @@ 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, int plane_index, 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 d7c1f9cf..2a158d97 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 | TEST_EBUSY;
> > > +
> > > +	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;
> > > @@ -494,7 +507,7 @@ static void check_state(const struct test_output *o, const struct event_state *e
> > >  	/* check only valid if no modeset happens in between, that increments by
> > >  	 * (1 << 23) on each step. This bounding matches the one in
> > >  	 * DRM_IOCTL_WAIT_VBLANK. */
> > > -	if (!(o->flags & (TEST_DPMS | TEST_MODESET)))
> > > +	if (!(o->flags & (TEST_DPMS | TEST_MODESET | TEST_NO_VBLANK)))
> > >  		igt_assert_f(es->current_seq - (es->last_seq + o->seq_step) <= 1UL << 23,
> > >  			     "unexpected %s seq %u, should be >= %u\n",
> > >  			     es->name, es->current_seq, es->last_seq + o->seq_step);
> > > @@ -1176,6 +1189,7 @@ static void run_test_on_crtc_set(struct test_output *o, int *crtc_idxs,
> > >  	unsigned bo_size = 0;
> > >  	uint64_t tiling;
> > >  	int i;
> > > +	bool vblank = true;
> > >  
> > >  	switch (crtc_count) {
> > >  	case RUN_TEST:
> > > @@ -1259,6 +1273,14 @@ 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]);
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