linux-kernel - Re: [PATCH 3/3] MIPS: DMA: Add plat_extra_sync_for

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Date:	Thu, 9 Sep 2010 11:35:08 -0700
From:	Kevin Cernekee <cernekee@...il.com>
To:	Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:	David Daney <ddaney@...iumnetworks.com>,
	Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] MIPS: DMA: Add plat_extra_sync_for_cpu()

On Thu, Sep 9, 2010 at 10:34 AM, Thomas Bogendoerfer
<tsbogend@...ha.franken.de> wrote:
> looks like this is doing what the non_coherent_r10000 case does. So IMHO

My code is not currently in the tree, but I have 3 different hooks for
3 different processor types.  The generic __dma_sync() workaround used
on R10K is not sufficient.

> either which make non_coheren check more generic or could use the new
> plat_sync thingie for IP28 and other non coherent r10k boxes.

That is a good idea.  One thing I'd like to do is continue sharing the
same R10K code for IP27 / IP28 / IP32 / SNI_RM, and move all of it out
of dma-default.c .  Do you have any suggestions on how to define the
plat_* handlers on a per-cpu-type basis instead of making 4 identical
copies of the R10K workaround?
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