linux-kernel - Re: [PATCHv3 00/11] staging tidspbridge: iommu migration

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Date:	Tue, 12 Oct 2010 14:20:59 +0300
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	"Guzman Lugo, Fernando" <fernando.lugo@...com>
Cc:	"gregkh@...e.de" <gregkh@...e.de>,
	"felipe.contreras@...ia.com" <felipe.contreras@...ia.com>,
	"ameya.palande@...ia.com" <ameya.palande@...ia.com>,
	"Menon, Nishanth" <nm@...com>,
	"Hiroshi.DOYU@...ia.com" <Hiroshi.DOYU@...ia.com>,
	"ohad@...ery.com" <ohad@...ery.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [PATCHv3 00/11] staging tidspbridge: iommu migration

On Mon, Oct 11, 2010 at 6:03 PM, Guzman Lugo, Fernando
<fernando.lugo@...com> wrote:
>> On Tue, Oct 5, 2010 at 11:35 PM, Fernando Guzman Lugo
>> <x0095840@...com> wrote:
>> > This set of patches remove the dspbridge custom mmu
>> implementation and
>> > use iommu module instead.
>>
>> I have tried this, it works for simple tests, but not real use-cases.
>> I applied all your iommu patches. How did you test this?
>
> Have you applied:
>
> - "scatterlist: define SG chain for arm architecture"
> - "iovmm: replace __iounmap with omap_iounmap"
> - "iovmm: add superpages support to fixed da address"
> - "iovmm: IVA2 MMU range is from 0x11000000 to 0xFFFFFFFF"
> - "iovmm: no gap checking for fixed address"

Yes.

> Also make sure your baseline have this patch:
>
> - "omap:iommu-load cam register before flushing the entry"

Huh? That's not even in v2.6.36-rc7, in which baseline is this
supposed to be in? Anyway, I'll try adding that.

> What kind of error are you getting?

Node allocation failing IIRC.

> I don't have a complete framework to test MM testcases at this moment

See:
http://felipec.wordpress.com/2010/10/08/my-arm-development-notes/

I even prepared a tarball so you just need to extract it on your
device. It's not difficult to test this with GStreamer, and I don't
see how you can be confident that they indeed work without testing
some real use-cases. Anyway, I'll try that missing patch.

Cheers.

-- 
Felipe Contreras
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