linux-kernel - Re: [RFC 2/6] omap: iovmm: generic iommu api migration

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Date:	Wed, 8 Jun 2011 12:46:52 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	"Ohad Ben-Cohen" <ohad@...ery.com>
Cc:	linux-media@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Hiroshi.DOYU@...ia.com, arnd@...db.de, davidb@...eaurora.org,
	Joerg.Roedel@....com
Subject: Re: [RFC 2/6] omap: iovmm: generic iommu api migration

Hi Ohad,

On Tuesday 07 June 2011 15:46:26 Ohad Ben-Cohen wrote:
> On Tue, Jun 7, 2011 at 2:26 PM, Laurent Pinchart wrote:
> >> Right now we have a BUG_ON if pa is unaligned, but that can be changed
> >> if needed (do we want it to handle offsets ?).
> > 
> > At least for the OMAP3 ISP we need to, as video buffers don't necessarily
> > start on page boundaries.
> 
> Where do you take care of those potential offsets today ? Or do you
> simply ignore the offsets and map the entire page ?

Here http://marc.info/?l=linux-omap&m=130693502326513&w=2 :-)

> Seems like omap's iommu (mostly) rejects unaligned pa addresses, see:
> 
> 4abb761749abfb4ec403e4054f9dae2ee604e54f "omap iommu: Reject unaligned
> addresses at setting page table entry"
> 
> (this doesn't seem to cover 4KB entries though, only large pages,
> sections and super sections)
> 
> > A separate patch is indeed needed, yes. As you're already working on
> > iommu it might be simpler if you add it to your tree.
> 
> Sure, i'll send it.

-- 
Regards,

Laurent Pinchart
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