linux-kernel - Re: [PATCH 2/5] iommu/amd: Implement DOMAIN_ATTR

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Message-ID: <4F219AF2.6070108@freescale.com>
Date:	Thu, 26 Jan 2012 12:26:58 -0600
From:	Scott Wood <scottwood@...escale.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:	Joerg Roedel <joerg.roedel@....com>,
	<iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	David Woodhouse <dwmw2@...radead.org>,
	David Brown <davidb@...eaurora.org>,
	Tony Lindgren <tony@...mide.com>,
	Stuart Yoder <b08248@...il.com>,
	Hiroshi Doyu <hdoyu@...dia.com>
Subject: Re: [PATCH 2/5] iommu/amd: Implement DOMAIN_ATTR_GEOMETRY attribute

On 01/19/2012 10:27 AM, Laurent Pinchart wrote:
> 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).

If we want to be able to expose these attribute structs to userspace via
vfio, we'll want to stick with fixed size types.

-Scott

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