Messages in this thread | | | Date | Mon, 20 Oct 2008 12:01:22 +0200 | From | Ingo Molnar <> | Subject | Re: [git pull] drm patches for 2.6.27-rc1 |
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* Keith Packard <keithp@keithp.com> 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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