[Intel-gfx] pin OABUFFER to GGTT

[Chris Wilson]

On Tue, Jul 01, 2014 at 04:24:56PM +0000, Mateo Lozano, Oscar wrote:
> Submitting again (this time copying the mailing list correctly):
> 
> The bo_pin ioctl has been discarded in GEN6+ with this patch:
> 
>     drm/i915: Reject the pin ioctl on gen6+
>     
>     Especially with ppgtt this kinda stopped making sense. And if we
>     indeed need this to hack around an issue, we need something that also
>     works for non-root.
>     
>     Signed-off-by: Daniel Vetter daniel.vetter at ffwll.ch
> 
> The thing is, the performance team used this call to pin the OABUFFER to GGTT and then mapping it to userspace. This OABUFFER cannot be in PPGTT because: "When each context has its own Per Process GTT, this field should be always set to GGTT." (BSpec dixit).
> 
> Can we re-enable it? or should we find an alternative for this case?

EXEC_OBJECT_NEEDS_GTT?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre