linux-kernel - Re: [RFC 0/6] iommu: generic api migration and grouping

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Message-ID: <20110607075221.GB4407@amd.com>
Date:	Tue, 7 Jun 2011 09:52:21 +0200
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	Ohad Ben-Cohen <ohad@...ery.com>
CC:	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"laurent.pinchart@...asonboard.com" 
	<laurent.pinchart@...asonboard.com>,
	"Hiroshi.DOYU@...ia.com" <Hiroshi.DOYU@...ia.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"davidb@...eaurora.org" <davidb@...eaurora.org>,
	Omar Ramirez Luna <omar.ramirez@...com>
Subject: Re: [RFC 0/6] iommu: generic api migration and grouping

On Mon, Jun 06, 2011 at 04:09:33PM -0400, Ohad Ben-Cohen wrote:
> On Mon, Jun 6, 2011 at 10:20 PM, Roedel, Joerg <Joerg.Roedel@....com> wrote:
> > Well, it certainly makes sense to have a single implementation for this.
> > But I want to hide this complexity to the user of the IOMMU-API. The
> > best choice is to put this into the layer between the IOMMU-API and the
> > backend implementation.
> 
> I agree.
> 
> The IOMMU API should take physically contiguous regions from the user,
> split them up according to page-sizes (/alignment requirements)
> supported by the hardware, and then tell the underlying implementation
> what to map where.

Yup. Btw, is there any IOMMU hardware which supports non-natural
alignment? In this case we need to expose these requirements somehow.

Regards,

	Joerg

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