linux-kernel - Re: [PATCH RFC 1/8] arm: make SWIOTLB available

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Message-ID: <alpine.DEB.2.02.1308021250050.4893@kaball.uk.xensource.com>
Date:	Fri, 2 Aug 2013 12:59:00 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	<xen-devel@...ts.xensource.com>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <Ian.Campbell@...rix.com>,
	<will.deacon@....com>, <linux@....linux.org.uk>
Subject: Re: [PATCH RFC 1/8] arm: make SWIOTLB available

On Wed, 31 Jul 2013, Konrad Rzeszutek Wilk wrote:
> Stefano Stabellini <stefano.stabellini@...citrix.com> wrote:
> >Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> >CC: will.deacon@....com
> >CC: linux@....linux.org.uk
> >---
> > arch/arm/Kconfig                   |    7 +++++++
> > arch/arm/include/asm/dma-mapping.h |   24 ++++++++++++++++++++++++
> > 2 files changed, 31 insertions(+), 0 deletions(-)
> >
> >diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> >index ba412e0..05125ab 100644
> >--- a/arch/arm/Kconfig
> >+++ b/arch/arm/Kconfig
> >@@ -1832,6 +1832,13 @@ config CC_STACKPROTECTOR
> > 	  neutralized via a kernel panic.
> > 	  This feature requires gcc version 4.2 or above.
> > 
> >+config SWIOTLB
> >+	def_bool y
> >+	select NEED_SG_DMA_LENGTH
> >+
> >+config IOMMU_HELPER
> >+	def_bool SWIOTLB
> >+
> 
> Could you explain the purpose of these two a bit more please? 

SWIOTLB is not available on arm at the moment.
We need to make it available, otherwise SWIOTLB_XEN won't be able to
select it.

Similarly, IOMMU_HELPER is another lib Kconfig symbol needed by SWIOTLB
to compile.
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