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drm/i915: Use topdown allocation for PPGTT PDEs on gen6/7

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It was always the intention to do the topdown allocation for context
objects (Chris' idea originally). Unfortunately, I never managed to land
the patch, but someone else did, so now we can use it.

As a reminder, hardware contexts never need to be in the precious GTT
aperture space - which is what is what happens with the normal bottom up
allocation we do today. Doing a top down allocation increases the odds
that the HW contexts can get out of the way, especially with per FD
contexts as is done in full PPGTT

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2014-05-06 22:21:30 -07:00 committed by Daniel Vetter
parent fd7f8ccea8
commit 3e8b5ae9b0
1 changed files with 1 additions and 2 deletions
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3
drivers/gpu/drm/i915/i915_gem_gtt.c
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@ -1035,8 +1035,7 @@ alloc:
&ppgtt->node, GEN6_PD_SIZE,
GEN6_PD_ALIGN, 0,
0, dev_priv->gtt.base.total,
DRM_MM_SEARCH_DEFAULT,
DRM_MM_CREATE_DEFAULT);
DRM_MM_TOPDOWN);
if (ret == -ENOSPC && !retried) {
ret = i915_gem_evict_something(dev, &dev_priv->gtt.base,
GEN6_PD_SIZE, GEN6_PD_ALIGN,