[Intel-gfx] [PATCH 07/15] drm/i915: pass mm.gtt_page_sizes to ppgtt insert_entries

[Chris Wilson]

On Wed, May 31, 2017 at 07:52:02PM +0100, Matthew Auld wrote:
> In preparation for supporting huge-pages for the ppgtt, we need to know
> the details of mm.page_sizes at insertion time, such that we can we can
> easily determine the page sizes we are allowed to use.  This is
> especially true for 64K where we can't just arbitrarily use it, since we
> require aligning/padding the vm space to 2M, which sometimes we can't
> enforce.

I haven't considered the implications yet, but this information should
be available on the vma. In principle, the intent here is to more or less
do vma->vm->insert_entries(vma, flags); Just wondering how practical it
will be to get the relevant bits into the vma. Looks doable at first
glance, and it prevent the issue of having multiple vma cloberring the
obj->mm.page_sizes.gtt.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre