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My uneducated feeling is with gpuvm trying to be > > common code it could also have gpuvm provide shared common code that > > directly builds page tables in CPU memory using the above framework. > > So, gpuvm is one level up (it doesn't deal at all with any HW > representation), but I guess we could provide helpers for UMA-GPUs, > where preparing the page table on the CPU is a thing, and it could be > that MSM would be interested in using those helpers too. You can make it work like the iommu does where gpuvm gets a "gpu domain" from the driver that is created by using the common code from gpuvm. Then most of the code is common. I think something could be built that works with the framebuffer resident page tables too if they are being accessed over mmio. Jason