linux-kernel - Re: IOMMU and graphics cards

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Date:	Tue, 7 Jul 2009 10:54:08 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Dave Airlie <airlied@...il.com>
CC:	Dave Airlie <airlied@...ux.ie>,
	David Woodhouse <dwmw2@...radead.org>,
	Joerg Roedel <joro@...tes.org>,
	Zhenyu Wang <zhenyu.z.wang@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"fujita.tomonori@....ntt.co.jp" <fujita.tomonori@....ntt.co.jp>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	David Miller <davem@...emloft.net>,
	"eric@...olt.net" <eric@...olt.net>
Subject: Re: IOMMU and graphics cards

On Tue, Jul 07, 2009 at 08:00:01AM +1000, Dave Airlie wrote:
> 
> Could you also enumerate any limitations of the IOMMUs on the amount
> of memory they can remap per device if any.

The AMD IOMMU driver in 2.6.31-rcX can map up to 4GB per domain. If the
gfx card has a domain of its own it can use all of the 4GB.
I am not 100% sure about VT-d, but as far as I understood the allocator
it doesn't have that 4GB limitation per domain.

	Joerg

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