[igt-dev] [PATCH i-g-t] [RFC] tests/kms_prime: Aligned pitch to 64 byte for Intel platforms

[Surendrakumar Upadhyay, TejaskumarX]

> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of
> Srinivas, Vidya
> Sent: 31 May 2021 20:18
> To: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Cc: igt-dev at lists.freedesktop.org; intel-gfx at lists.freedesktop.org; Lin,
> Charlton <charlton.lin at intel.com>
> Subject: Re: [Intel-gfx] [igt-dev] [PATCH i-g-t] [RFC] tests/kms_prime: Aligned
> pitch to 64 byte for Intel platforms
> 
> Hello Ville,
> 
> Thank you very much.
> Before reaching our i915's i915_gem_dumb_create, it goes to
> vgem_gem_dumb_create for kms_prime.
> 
> The pitch gets calculated there and it is not 64 byte aligned. Due to this,
> intel_framebuffer_init reports "pitch must be 64 byte aligned"
> and framebuffer creation fails. I tried submitting vgem patch where 64 byte
> alignment can be done in vgem_gem_dumb_create and that also passes. But
> we did not get approval yet as few of them felt, vgem is generic and other
> platforms might fail if we do 64 byte alignment there.
> 
> Kindly suggest. Thanks a lot.
> 
> Regards
> Vidya
> 
> -----Original Message-----
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Sent: Monday, May 31, 2021 7:48 PM
> To: Srinivas, Vidya <vidya.srinivas at intel.com>
> Cc: intel-gfx at lists.freedesktop.org; igt-dev at lists.freedesktop.org; Lin,
> Charlton <charlton.lin at intel.com>
> Subject: Re: [igt-dev] [PATCH i-g-t] [RFC] tests/kms_prime: Aligned pitch to 64
> byte for Intel platforms
> 
> On Fri, May 28, 2021 at 10:04:03AM +0530, Vidya Srinivas wrote:
> > For Intel platforms, pitch needs to be 64 byte aligned.
> > Kernel code vgem_gem_dumb_create which is platform generic code
> doesnt
> > do the alignment. This causes frame buffer creation to fail on Intel
> > platforms where the pitch is not 64 byte aligned.
> >
> > tests: test run on Intel platforms with panel resolution 1366x768
> >
> > Signed-off-by: Vidya Srinivas <vidya.srinivas at intel.com>
> > ---
> >  tests/kms_prime.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/tests/kms_prime.c b/tests/kms_prime.c index
> > 8cb2ca2a9dc3..fdc941fe8100 100644
> > --- a/tests/kms_prime.c
> > +++ b/tests/kms_prime.c
> > @@ -51,6 +51,8 @@ static struct {
> >  	{ .r = 1.0, .g = 0.0, .b = 0.0, .color = 0xffff0000 },  };
> >
> > +bool check_platform;
> > +
> >  IGT_TEST_DESCRIPTION("Prime tests, focusing on KMS side");
> >
> >  static bool has_prime_import(int fd)
> > @@ -101,7 +103,7 @@ static void prepare_scratch(int exporter_fd, struct
> dumb_bo *scratch,
> >  	scratch->bpp = 32;
> >
> >  	scratch->handle = kmstest_dumb_create(exporter_fd,
> > -			scratch->width,
> > +			check_platform? ALIGN(scratch->width, 64): scratch-
> >width,
> 
> The dumb_create ioctl already does this for us.

I915_dumb_create does it for us but "vgem_gem_dumb_create" does not do 64 ALIGN. And kms_prime is using "vgem_gem_dumb_create" never call i915 dumb_create() as the IGT creates buffer through VGEM driver, see below IGT snippet :

/* ANY = anything that is not VGEM */
                first_fd = __drm_open_driver_another(0, DRIVER_ANY | DRIVER_VGEM);
                igt_require(first_fd >= 0);

                second_fd = __drm_open_driver_another(1, DRIVER_ANY | DRIVER_VGEM);

Thanks,
Tejas
> 
> >  			scratch->height,
> >  			scratch->bpp,
> >  			&scratch->pitch,
> > @@ -262,6 +264,7 @@ igt_main
> >
> >  		/* ANY = anything that is not VGEM */
> >  		first_fd = __drm_open_driver_another(0, DRIVER_ANY |
> DRIVER_VGEM);
> > +		check_platform = is_i915_device(first_fd);
> >  		igt_require(first_fd >= 0);
> >
> >  		second_fd = __drm_open_driver_another(1, DRIVER_ANY |
> DRIVER_VGEM);
> > --
> > 2.7.4
> >
> > _______________________________________________
> > igt-dev mailing list
> > igt-dev at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/igt-dev
> 
> --
> Ville Syrjälä
> Intel
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