RE: [PATCH v2] IA64 Compilation Error Fix for Intel IOMMU Identity Mapping Support
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- To: "Yu, Fenghua" <fenghua.yu@xxxxxxxxx>
- Subject: RE: [PATCH v2] IA64 Compilation Error Fix for Intel IOMMU Identity Mapping Support
- From: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
- Date: Fri, 26 Jun 2009 19:21:28 +0100
- Cc: "'FUJITA Tomonori'" <fujita.tomonori@xxxxxxxxxxxxx>, "'chrisw@xxxxxxxxxx'" <chrisw@xxxxxxxxxx>, "'torvalds@xxxxxxxxxxxxxxxxxxxx'" <torvalds@xxxxxxxxxxxxxxxxxxxx>, "'akpm@xxxxxxxxxxxxxxxxxxxx'" <akpm@xxxxxxxxxxxxxxxxxxxx>, "Luck, Tony" <tony.luck@xxxxxxxxx>, "'linux-kernel@xxxxxxxxxxxxxxx'" <linux-kernel@xxxxxxxxxxxxxxx>, "'iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx'" <iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx>, "'linux-ia64@xxxxxxxxxxxxxxx'" <linux-ia64@xxxxxxxxxxxxxxx>
- In-reply-to: <A6AD88C3F2289247BE726C37303E1EB8B0216BF5@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- List-id: <linux-ia64.vger.kernel.org>
- References: <20090625003841.GA12226@xxxxxxxxxxxxxxxxxxxxx> <20090625095643F.fujita.tomonori@xxxxxxxxxxxxx> <20090625041605.GA9330@xxxxxxxxxxxxxxxxxxxxx> <20090625134827W.fujita.tomonori@xxxxxxxxxxxxx> <1245913886.17089.91.camel@xxxxxxxxxxxxxxxxxxxxx> <1245966743.30355.42.camel@xxxxxxxxxxxxxxxxxxxxx> <A6AD88C3F2289247BE726C37303E1EB8B0216BF5@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
On Thu, 2009-06-25 at 14:56 -0700, Yu, Fenghua wrote:
>
> >(Fenghua, why are we doing the whole setup per pci dev anyway -- why
> not
> >set up the page tables once and point all devices at the same page
> >tables?)
> >
>
> That's what the ia64 fix patch does...the first pci device set up the
> page table. Then all following pci devices use that page table by
> setting up the context mapping.
I've sorted that out separately -- it's not necessarily part of this
fix, although it _would_ be nice to have it in 2.6.31, since your
original 1:1 mapping patch is quite slow (and takes quite a lot of
memory) without it.
This time, I _am_ going to let it bake in linux-next for a while first
though.
Until Linus pulls the IA64 build fix from the real iommu-2.6.git tree,
I've put this into git://git.infradead.org/~dwmw2/iommu-pt.git
--
David Woodhouse Open Source Technology Centre
David.Woodhouse@xxxxxxxxx Intel Corporation
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