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

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Date:	Tue, 24 Aug 2010 11:31:30 -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 5:09 AM
> 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 Fri, Jul 2, 2010 at 9:39 PM, Guzman Lugo, Fernando 
> <fernando.lugo@...com> wrote:
> > I think, it would be good if we get rid of DMMPOOL size, if 
> the liked list grow up as it is needed, there is no memory 
> penalty of have all the possible iommu addresses valid 
> (11000000 - FFFFFFFF). The reservation will only fail when 
> there is no memory. If a software restriction is needed we 
> could define a start and end addresses for iommu module 
> (maybe as a parameter when the iommu handle for iva2 is got) 
> and that boundaries can be taking in account at the moment of 
> reserve the memory.
> 
> What happened to this?
> 
> IIUC what you are proposing is to remove the DMM pool 
> completely, that makes sense to me. However, is it really 
> needed to finish the iommu migration to do this?
> 
> > I think the reserve/unreserved dspbridge api can disappear 
> and just return the da address in the map function.
> 
> This is something I've proposed before, so I agree :)

Yeah, that is how it will be. I have been busy with other stuffs, but now
I have finish a version with all dmm module removed and reserve/unreserve
Api removed as well. But because a the big # of patches merge in dspbrdge
I have to rebase them to the latest, I hope finish this week and send
Them again next week.

Regards,
Fernando.

> 
> --
> Felipe Contreras
> --
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