linux-kernel - RE: [PATCH 5/5] iommu: Add DOMAIN_ATTR

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Message-ID: <C5ECD7A89D1DC44195F34B25E172658D3792D4@039-SN2MPN1-013.039d.mgd.msft.net>
Date:	Tue, 5 Feb 2013 17:15:45 +0000
From:	Sethi Varun-B16395 <B16395@...escale.com>
To:	Joerg Roedel <joro@...tes.org>
CC:	Stuart Yoder <b08248@...il.com>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Wood Scott-B07421 <B07421@...escale.com>
Subject: RE: [PATCH 5/5] iommu: Add DOMAIN_ATTR_WINDOWS domain attribute



> -----Original Message-----
> From: Joerg Roedel [mailto:joro@...tes.org]
> Sent: Tuesday, February 05, 2013 6:36 PM
> To: Sethi Varun-B16395
> Cc: Stuart Yoder; iommu@...ts.linux-foundation.org; linux-
> kernel@...r.kernel.org; Wood Scott-B07421
> Subject: Re: [PATCH 5/5] iommu: Add DOMAIN_ATTR_WINDOWS domain attribute
> 
> On Tue, Feb 05, 2013 at 10:52:03AM +0000, Sethi Varun-B16395 wrote:
> > DOMAIN_ATTR_PAMU_ENABLE is required to enable a particular DMA window.
> > My point is about the domain geometry, which is incomplete in case of
> > PAMU without the number of subwindows. Geometry parameters are used
> > for initializing the PAMU window settings. Individual subwindows can
> > only be enabled, once the PAMU window has been initialized using the
> > geometry settings.
> 
> I understand that. What you do is:
> 
> 	/* Set geometry */
> 	set_attr(domain, DOMAIN_ATTR_GEOMETRY);
> 
> 	/* Set number of PAMU subwindows */
> 	set_attr(domain, DOMAIN_ATTR_WINDOWS);
> 
> 	/* Commit changes to hardware and enable the window */
> 	set_attr(domain, DOMAIN_ATTR_PAMU_ENABLE);
> 
> And I don't see any problem with that. The domain_attr interface was
> introduced to cope with device specifics, we don't change global
> interface data structures for that.
> 
> 
[Sethi Varun-B16395] But, then it would be mandatory to set the DOMAIN_ATTR_WINDOWS attribute in case of PAMU. I guess that it would be implementation specific. I am fine with the API.

-Varun

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