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drm/i915: Mention when we enable the Ironlake iommu workarounds

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The iommu and gfx on Ironlake do not like each other and require a
big hammer to prevent hard machine hangs. In

commit 5c0422878f
Author: Ben Widawsky <ben@bwidawsk.net>
Date:   Mon Oct 17 15:51:55 2011 -0700

    drm/i915: ILK + VT-d workaround

we added the workaround, but never emitted any debug message that it was
active. Doing so should help identify known performance regressions.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2013-12-30 12:16:15 +00:00 committed by Daniel Vetter
parent 3ec2f427e6
commit c0a7f81899
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/i915_gem_gtt.c
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@ -1438,6 +1438,9 @@ static int i915_gmch_probe(struct drm_device *dev,
dev_priv->gtt.base.clear_range = i915_ggtt_clear_range;
dev_priv->gtt.base.insert_entries = i915_ggtt_insert_entries;
if (unlikely(dev_priv->gtt.do_idle_maps))
DRM_INFO("applying Ironlake quirks for intel_iommu\n");
return 0;
}