[Intel-gfx] [PATCH 10/15] drm/i915: introduce ppgtt page coloring

[Chris Wilson]

On Mon, Mar 06, 2017 at 11:54:09PM +0000, Matthew Auld wrote:
> To enable 64K pages we need to set the intermediate-page-size(IPS) bit
> of the pde, therefore a page table is said to be either operating in 64K
> or 4K mode. To accommodate this vm placement restriction we introduce a
> color for pages and corresponding color_adjust callback. Currently this
> only considers the full 48bit ppgtt case.

Why? That's just an alignment restriction.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre