[Intel-gfx] [PATCH 1/2] drm/i915/gtt: Enable full-ppgtt by default everywhere

[Chris Wilson]

Quoting Chris Wilson (2018-06-18 11:10:23)
> We should we have all the kinks worked out and full-ppgtt now works
> reliably on gen7 (Ivybridge, Valleyview/Baytrail and Haswell). If we can
> let userspace have full control over their own ppgtt, it makes softpinning
> far more effective, in turn making GPU dispatch far more efficient and
> more secure (due to better mm segregation). On the other hand, switching
> over to a different GTT for every client does incur noticeable overhead.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
> Cc: Matthew Auld <matthew.william.auld at gmail.com>
> Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Jason Ekstrand <jason.ekstrand at intel.com>
> Cc: Kenneth Graunke <kenneth at whitecape.org>
> ---
> 
> This has been run through piglit for ivb/vlv/hsw locally and hsw on
> kernel's CI, but we would like at least one ack from Mesa as well. If
> it's possible to run it through the full gamut of your testing, that
> would be great.

The patches applies to drm-tip, and requires fixes in drm-tip for at
least one GPU hang full-ppgtt caused in piglit.
-Chris