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

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Date:	Mon, 20 Oct 2008 12:01:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Keith Packard <keithp@...thp.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Dave Airlie <airlied@...ux.ie>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.sf.net, Andrew Morton <akpm@...ux-foundation.org>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [git pull] drm patches for 2.6.27-rc1


* Keith Packard <keithp@...thp.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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