linux-kernel - Re: [PATCH] fsldma: add support to 36-bit physical address

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Message-Id: <492E9153-2D3E-4DA2-AD04-4F92C94DB3A7@kernel.crashing.org>
Date:	Wed, 22 Sep 2010 00:41:43 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Timur Tabi <timur.tabi@...il.com>
Cc:	Scott Wood <scottwood@...escale.com>,
	Dan Malek <ppc6dev@...italdans.com>,
	Dan Williams <dan.j.williams@...el.com>,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
	Becky Bruce <beckyb@...nel.crashing.org>
Subject: Re: [PATCH] fsldma: add support to 36-bit physical address


On Sep 21, 2010, at 5:34 PM, Timur Tabi wrote:

> On Tue, Sep 21, 2010 at 5:17 PM, Scott Wood <scottwood@...escale.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--
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