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On volta the GPU determines whether to do L3 allocation for a mapping by checking bit 36 of the physical address. So if a mapping should allocate lines in the L3 this bit must be set. However, when the physical addresses for 64GB of RAM uses the 36th bit resulting in a conflict. Thus, add support for disabling l3 support for SKUs having 64GB of physical memory. Bug 3486025 Signed-off-by: Debarshi Dutta <ddutta@nvidia.com> Change-Id: Ic540e754274cf1d9e6625493962699d21509e540 Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2661548 Reviewed-by: Brad Griffis <bgriffis@nvidia.com> Reviewed-by: Bibek Basu <bbasu@nvidia.com> Tested-by: Brad Griffis <bgriffis@nvidia.com> GVS: Gerrit_Virtual_Submit