drm/i915: extract hw ppgtt setup/cleanup code
At the moment only cosmetics, but being able to initialize/cleanup arbitrary ppgtt address spaces paves the way to have more than one of them ... Just in case we ever get around to implementing real per-process address spaces. Note that in that case another vfunc for ppgtt would be beneficial though. But that can wait until the code grows a second place which initializes ppgtts. Reviewed-by: NDamien Lespiau <damien.lespiau@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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