Re: [PATCH 2/5] iommu/amd: Implement DOMAIN_ATTR_GEOMETRY attribute

[Hiroshi Doyu]

From: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Subject: Re: [PATCH 2/5] iommu/amd: Implement DOMAIN_ATTR_GEOMETRY attribute
Date: Thu, 19 Jan 2012 17:27:09 +0100
Message-ID: <201201191727.10176.laurent.pinchart@xxxxxxxxxxxxxxxx>

> Hi Joerg,
> 
> On Thursday 19 January 2012 17:07:39 Joerg Roedel wrote:
> > On Thu, Jan 19, 2012 at 04:46:13PM +0100, Laurent Pinchart wrote:
> > > > +struct iommu_domain_geometry {
> > > > +	u64 aperture_start;	/* First address that can be mapped    */
> > > > +	u64 aperture_end;	/* Last address that can be mapped     */
> > > 
> > > Would it make sense to use a platform-dependent type that represents
> > > physical addresses instead of u64 ?
> > 
> > Well, u64 is a catch-all datatype which should suit all drivers. Is this
> > a problem at ARM?
> 
> No, it's not a problem for ARM, at least to my knowledge. It just struck me as 
> weird, as we have specific data types for other kinds of addresses (such as 
> dma_addr_t).
> 
> > We can also go the more complicated way of introducing an iova_addr_t or
> > something. But if possible I would like to avoid that.

"dma_addr_t" sounds nicer(and makes still sense) to me than a new "iova_addr_t".
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