[Intel-gfx] [PATCH i-g-t 1/3] lib/igt_fb: Allow specifiying object tiling when creating frame buffers

Ville Syrjälä ville.syrjala at linux.intel.com
Fri Oct 16 05:29:15 PDT 2015

On Fri, Oct 16, 2015 at 01:19:35PM +0100, Tvrtko Ursulin wrote:
> Hi,
> On 16/10/15 13:03, Ville Syrjälä wrote:
> > On Fri, Oct 16, 2015 at 11:59:47AM +0100, Tvrtko Ursulin wrote:
> >> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> >>
> >> Currently object tiling is inferred from the frame buffer modifier
> >> and only for legacy X scanout.
> >>
> >> It is useful to support overriding this selection for certain tests
> >> so add the capability.
> >
> > So you want to set up the object tiling differently from the fb
> > tiling? Why is that? And don't we reject it in the kernel? If we don't
> > need a fence for scanout (ie. FBC or gen2/3) we could allow it I
> > suppose, but not sure it it really helps with anything.
> Hm, yes and no. Only different in a sense that currently igt_fb leaves 
> object tiling at linear regardless of the fb modifier tiling. (Apart for 
> the legacy X where it requires that they match.)
> I needed a way of having Y tiled fb modifier and Y tiled object to hit a 
> warning in i915_gem_object_get_fence when only the rotated view exists.

Is there a problem of just doing what X tiled did also for Y tiled?

> Patch series is probably to invasive anyway, especially I did not spend 
> any time evaluating if 2/3 is safe. So hopefully Vivek can refine his 
> version of the testcase which would then be completely confined to 
> kms_rotation_crc.
> Regards,
> Tvrtko

Ville Syrjälä
Intel OTC

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