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

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Date:	Mon, 6 Jun 2011 17:35:57 +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 11:15:30AM -0400, Ohad Ben-Cohen wrote:

> This is insufficient; users need somehow to tell what page sizes are
> supported by the underlying hardware (we can't assume host page-sizes,
> and we want to use bigger pages whenever possible, to relax the TLB
> pressure).
/
What does the IOMMU-API user need this info for? On the x86 IOMMUs these
details are handled transparently by the IOMMU driver.

	Joerg

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