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On AMD APP APUs, to make UTCL2 snoop CPU caches, its not sufficient to rely on xgmi connected flag so add the logic to use is_app_apu to program the PDE_REQUEST_PHYSICAL bit correctly for gfxhub and mmhub both. Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com> Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>