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drm/i915: Access to snooped system memory through the GTT is incoherent

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We ignore all the user requests to handle flushing to the GTT domain if
the user requests such on a snoopable bo, and as such access through the
GTT to such pages remains incoherent. The specs even warn that such
behaviour is undefined - a strong reason never to do so.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-12-16 12:43:36 +00:00 committed by Daniel Vetter
parent 3f8c65d604
commit eb119bd612
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/i915/i915_gem.c
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@ -1341,6 +1341,12 @@ int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
trace_i915_gem_object_fault(obj, page_offset, true, write);
/* Access to snoopable pages through the GTT is incoherent. */
if (obj->cache_level != I915_CACHE_NONE && !HAS_LLC(dev)) {
ret = -EINVAL;
goto unlock;
}
/* Now bind it into the GTT if needed */
ret = i915_gem_object_pin(obj, 0, true, false);
if (ret)