Re: [git pull] drm patches for 2.6.27-rc1

[Ingo Molnar]

* Keith Packard <keithp@xxxxxxxxxx> wrote:

> On Sun, 2008-10-19 at 00:32 +0200, Ingo Molnar wrote:
> 
> > the _real_ remapping in a graphics aperture happens on the GPU level 
> > anyway, you manage an in-RAM GPU pagetable that just works like an 
> > IOMMU, correct?
> 
> Yes, a one-level linear MMU which uses BIOS-reserved memory.
> 
> So, at least for a prototype, on 64-bit we can just use ioremap_wc and 
> hold the mapping while the driver is open? Is there any huge benefit 
> to using the kernel mapping?

correct. There's no benefit to using the kernel mapping - and we can add 
2MB pages support to ioremap just fine and then you'll benefit from it 
automatically.

	Ingo
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