drm/i915/gen7: Re-enable full-ppgtt for ivb & hsw
After much hair pulling, resort to preallocating the ppGTT entries on init to circumvent the apparent lack of PD invalidate following the write to PP_DCLV upon switching mm between contexts (and here the same context after binding new objects). However, the details of that PP_DCLV invalidate are still unknown, and it appears we need to reload the mm twice to cover over a timing issue. Worrying. Fixes: 3dc007fe ("drm/i915/gtt: Downgrade gen7 (ivb, byt, hsw) back to aliasing-ppgtt") Signed-off-by:Chris Wilson <chris@chris-wilson.co.uk> Acked-by:
Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191129201328.1398583-1-chris@chris-wilson.co.uk
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