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Subject: Re: [PATCH] fsldma: add support to 36-bit physical address
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From: Kumar Gala <galak@kernel.crashing.org>
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Date: Wed, 22 Sep 2010 00:41:43 -0500
Cc: Scott Wood <scottwood@freescale.com>, Dan Malek <ppc6dev@digitaldans.com>,
        Dan Williams <dan.j.williams@intel.com>,
        linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
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        Becky Bruce <beckyb@kernel.crashing.org>
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To: Timur Tabi <timur.tabi@gmail.com>
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On Sep 21, 2010, at 5:34 PM, Timur Tabi wrote:

> On Tue, Sep 21, 2010 at 5:17 PM, Scott Wood <scottwood@freescale.com> wrote:
> 
>> It needs to be the actual device that is performing the DMA -- the
>> platform may need to do things such as IOMMU manipulation where
>> knowing the device matters.
> 
> Ok, this all makes sense.  So it appears that the patch is valid, at
> least in theory.  I would like to see some testing of it, but I
> realize that may be too difficult.  There's no easy way to force an
> allocation above 4GB.

I think the patch is pretty safe w/o testing.  However I agree we need a better solution to testing 36-bit addressing.

- k