Comment # 24
on bug 90537
from Michel Dänzer
(In reply to Christian König from comment #23) > > How would it break backwards compatibility? > > You would need to allow multiple mappings into the same address space per BO. > > Which is exactly what I've did for amdgpu, but IIRC that would break the > userspace interface because you won't return the mapped address any more > when you try to map it multiple times.... What would that break? It could result in the same BO having several representations in userspace, but (why) is that a problem? > > I'm not sure how not tracking the VA ranges per GEM handle could ever work > > as expected with several GEM handles referencing the same BO. > > Actually it can indeed never work correctly. What we just do all the time is > trying to avoid the case that several GEM handles reference the same BO very > hard. I'm afraid we can't always avoid that though, e.g. when sharing BOs between glamor and the Xorg driver.
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