linux-kernel - Re: [PATCH 1/9] xen: make sure swiotlb allocation is physically contigious

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Message-Id: <20090511122557D.fujita.tomonori@lab.ntt.co.jp>
Date:	Mon, 11 May 2009 12:40:33 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	jeremy@...p.org
Cc:	mingo@...e.hu, fujita.tomonori@....ntt.co.jp, x86@...nel.org,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	jeremy.fitzhardinge@...rix.com
Subject: Re: [PATCH 1/9] xen: make sure swiotlb allocation is physically
 contigious

On Thu,  7 May 2009 17:17:14 -0700
Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Impact: make swiotlb allocation suitable for Xen
> 
> When allocating the swiotlb buffer under Xen, make sure the memory is
> physically contiguous so that its really suitable for DMA.
> 
> Do this by allocating the memory as usual, but then call a Xen
> function to rearrange the underlying pages to be physically
> contiguous.
> 
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> Reviewed-by: "H. Peter Anvin" <hpa@...or.com>
> Cc: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> ---
>  arch/x86/kernel/pci-swiotlb.c |   10 ----------
>  arch/x86/xen/Makefile         |    1 +
>  arch/x86/xen/pci-swiotlb.c    |   27 +++++++++++++++++++++++++++
>  drivers/pci/xen-iommu.c       |   16 ++++++++++++++++
>  include/xen/swiotlb.h         |    6 ++++++
>  5 files changed, 50 insertions(+), 10 deletions(-)
>  create mode 100644 arch/x86/xen/pci-swiotlb.c
>  create mode 100644 include/xen/swiotlb.h

Acked-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
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