linux-kernel - Re: [PATCHv6 4/4] omap: iommu - create new api to set valid da range

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Message-ID: <AANLkTimNeDCH4jvP1QM785oNdua+GzwmtUA+OKzmO5aX@mail.gmail.com>
Date:	Tue, 14 Dec 2010 12:59:44 -0600
From:	"Guzman Lugo, Fernando" <fernando.lugo@...com>
To:	Felipe Contreras <felipe.contreras@...il.com>
Cc:	Hiroshi.DOYU@...ia.com, linux@....linux.org.uk, h-kanigeri2@...com,
	felipe.contreras@...ia.com, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	tony@...mide.com, "Guzman Lugo, Fernando" <x0095840@...com>
Subject: Re: [PATCHv6 4/4] omap: iommu - create new api to set valid da range

On Tue, Dec 14, 2010 at 9:08 AM, Felipe Contreras
<felipe.contreras@...il.com> wrote:
> On Tue, Dec 14, 2010 at 3:07 PM, Fernando Guzman Lugo
> <fernando.lugo@...com> wrote:
>> From: Guzman Lugo, Fernando <x0095840@...com>
>>
>> Some IOMMUs cannot use the whole 0x0 - 0xFFFFFFFF rage.
>> With this new API the valid range can be set.
>>
>> Signed-off-by: Fernando Guzman Lugo <x0095840@...com>
>> Acked-by: Hiroshi DOYU <Hiroshi.DOYU@...ia.com>
>
> I still don't see where this API is being used.

you can find it here:

http://marc.info/?l=linux-kernel&m=128805403014740&w=2

I will add it to the iommu migration set once all the dependencies are merged.

>
> Also, the point of using platform data was to add it to omap3_devices
> in omap-iommu.c, see[1]. I thought the platform data start/end would
> move to struct iommu, and iommu_set_da_range would change the
> start/end on struct iommu, but that would only be necessary if the
> platform data doesn't match that.

it is not clear for me. do you mean having default start/end in
platform data then when iommu_get is call pass them to start/end in
struct iommu and the new api change start/end in struct iommu?

Please let me know if that is correct.

Regards,
Fernando.

>
> If there's no sensible platform data default, then there's no point in
> using platform data, as the platform is not the limiting factor, but
> the DSP SW.
>
> [1] http://article.gmane.org/gmane.linux.kernel/1051268
>
> --
> Felipe Contreras
>
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