drm/amdgpu: meld together VM fragment and huge page handling
This optimizes the generating of PTEs by walking the hierarchy only once for a range and making changes as necessary. It allows for both huge (2MB) as well giant (1GB) pages to be used on Vega and Raven. Signed-off-by: NChristian König <christian.koenig@amd.com> Reviewed-by: NFelix Kuehling <Felix.Kuehling@amd.com> Reviewed-by: NHuang Rui <ray.huang@amd.com> Acked-by: NJunwei Zhang <Jerry.Zhang@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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