linux-kernel - RE: [PATCH 8/9] dspbridge: add map support for big buffers

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Date:	Tue, 24 Aug 2010 14:05:13 -0500
From:	"Guzman Lugo, Fernando" <fernando.lugo@...com>
To:	Felipe Contreras <felipe.contreras@...il.com>
CC:	"Kanigeri, Hari" <h-kanigeri2@...com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ohad@...ery.com" <ohad@...ery.com>,
	"hiroshi.doyu@...ia.com" <hiroshi.doyu@...ia.com>,
	"ameya.palande@...ia.com" <ameya.palande@...ia.com>,
	"felipe.contreras@...ia.com" <felipe.contreras@...ia.com>
Subject: RE: [PATCH 8/9] dspbridge: add map support for big buffers

 

> -----Original Message-----
> From: Felipe Contreras [mailto:felipe.contreras@...il.com] 
> Sent: Tuesday, August 24, 2010 1:55 PM
> To: Guzman Lugo, Fernando
> Cc: Kanigeri, Hari; linux-omap@...r.kernel.org; 
> linux-kernel@...r.kernel.org; ohad@...ery.com; 
> hiroshi.doyu@...ia.com; ameya.palande@...ia.com; 
> felipe.contreras@...ia.com
> Subject: Re: [PATCH 8/9] dspbridge: add map support for big buffers
> 
> On Tue, Aug 24, 2010 at 9:44 PM, Guzman Lugo, Fernando 
> <fernando.lugo@...com> wrote:
> >> However, I still have the question about the dependency on iommu; 
> >> AFAICS the DMM removal doesn't depend on the migration to iommu, 
> >> which AFAIK has been stalled for some time.
> >
> > Yeah, DMM removal does not depend on iommu migration. 
> However, After 
> > the changes for iommu migration the DMM module is not 
> Needed anymore, 
> > so it is better to remove it too.
> 
> Yes, but there are two options:
> 
> a) 1. Migrate to iommu, 2. Remove DMM
> 
> or:
> 
> b) 1. Remove DMM, 2. Migrate to iommu
> 
> I've heard there are some problems regarding DMM, and since 
> you say you have already done the changes, and since iommu 
> migration is not yet ready AFAIK, it might make sense to go 
> for option b).
> 
> Anyway, thanks for the clarification :)

But DMM is used in this momment, it is after the IOMMU migration
When DMM is not needed anymore. So we need to go for option a).

Regards,
Fernando.

> 
> --
> Felipe Contreras
> --
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