[Intel-gfx] [PATCH 27/29] drm/i915: Allocate overlay registers from stolen memory

[Daniel Vetter]

On Wed, Aug 22, 2012 at 04:45:45PM +0100, Chris Wilson wrote:
> On Mon, 20 Aug 2012 23:17:06 +0200, Daniel Vetter <daniel at ffwll.ch> wrote:
> > On Sat, Aug 11, 2012 at 03:41:26PM +0100, Chris Wilson wrote:
> > > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > 
> > Since most of the overlay-supporting hw uses physical mem for the overlay
> > I think this isn't much worth it: The additional frobbery in
> > attach/detach_phys object is likely more work than we'll anything we'll
> > ever gain from using stolen mem here. Especially since we'll use stolen
> > mem already for the rings.
> 
> In a straw poll of the machines on my desk, non-physical machines outnumber the physical overlay machines. :-p
> 
> However, hooking up the physical to use stolen is also a good idea. Too
> bad, I haven't found a way to detect the base of stolen memory on gen2
> devices without arch specific internals. It worked nicely right up until
> I tried to build i915.ko as a module.

Hm, can't we make a case to EXPORT_GPL that memmap?
-Daniel
-- 
Daniel Vetter
Mail: daniel at ffwll.ch
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