linux-kernel - RE: [PATCHv4 4/4] iommu: create new api to set valid da range

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Message-ID: <496565EC904933469F292DDA3F1663E602F4936594@dlee06.ent.ti.com>
Date:	Fri, 22 Oct 2010 11:23:34 -0500
From:	"Guzman Lugo, Fernando" <fernando.lugo@...com>
To:	Felipe Contreras <felipe.contreras@...il.com>
CC:	"Hiroshi.DOYU@...ia.com" <Hiroshi.DOYU@...ia.com>,
	"felipe.contreras@...ia.com" <felipe.contreras@...ia.com>,
	"david.cohen@...ia.com" <david.cohen@...ia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: RE: [PATCHv4 4/4] iommu: create new api to set valid da range

 

> -----Original Message-----
> From: Felipe Contreras [mailto:felipe.contreras@...il.com] 
> Sent: Friday, October 22, 2010 4:59 AM
> To: Guzman Lugo, Fernando
> Cc: Hiroshi.DOYU@...ia.com; felipe.contreras@...ia.com; 
> david.cohen@...ia.com; linux-kernel@...r.kernel.org; 
> linux-omap@...r.kernel.org
> Subject: Re: [PATCHv4 4/4] iommu: create new api to set valid da range
> 
> On Wed, Oct 20, 2010 at 7:26 PM, Felipe Contreras 
> <felipe.contreras@...il.com> wrote:
> > On Wed, Oct 20, 2010 at 6:22 PM, Guzman Lugo, Fernando 
> > <fernando.lugo@...com> wrote:
> >>> On Wed, Oct 20, 2010 at 5:48 AM, Fernando Guzman Lugo 
> >>> <x0095840@...com> wrote:
> >>> > Some IOMMUs cannot use the whole 0x0 - 0xFFFFFFFF range.
> >>> > With this new API the valid range can be set.
> >>> >
> >>> > Signed-off-by: Fernando Guzman Lugo <x0095840@...com>
> >>>
> >>> I don't see the point in having an API. It could be done
> >>
> >> Thanks to this api we can make this:
> >>
> >> A new kconfig parameter for DMM size is added. Also DMM is 
> allocated 
> >> in the last part of the IVA MMU capable address.
> >> So that DMM address are far away of shared memory address reducing 
> >> the probability of shared memory corruption.
> >
> > Ok, that's why it's usually a good idea to send a patch 
> that makes use 
> > of the new API.
> 
> Oh, and some more comments: Hiroshi wanted the end address 
> too, but also on the platform data.

I will try that.

> 
> And please use a sensible prefix, like "omap: iommu: ", if you only do
> "iommu: " it can be confused with other parts of the system, 
> specially if you send to lkml.

Sure, I wil take care for that.

Thanks and regards,
Fernando.

> 
> --
> Felipe Contreras
> --
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