From: David Daney <ddaney@caviumnetworks.com>
To: Kevin Cernekee <cernekee@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Ralf Baechle <ralf@linux-mips.org>,
linux-mips@linux-mips.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] MIPS: DMA: Add plat_extra_sync_for_cpu()
Date: Thu, 09 Sep 2010 11:58:25 -0700 [thread overview]
Message-ID: <4C892E51.9050901@caviumnetworks.com> (raw)
In-Reply-To: <AANLkTikXd9Hf6nX2X0CSi__t5nm60XFcWLAgFtJ+sZZh@mail.gmail.com>
On 09/09/2010 11:35 AM, Kevin Cernekee wrote:
> On Thu, Sep 9, 2010 at 10:34 AM, Thomas Bogendoerfer
> <tsbogend@alpha.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?
>
I am working on patches that use asm-generic/dma-mapping-common.h. This
dispatches all DMA operations via a dma_map_ops vector.
It adds some function call overhead, but makes it easy to mix and match
different implementations.
My main motivation is to integrate the swiotlb.c bounce buffer
management for devices that have small dma_masks.
It is still a work in progress, and is not ready to publish yet.
I foresee a lot of churn in this area in the near future.
David Daney
prev parent reply other threads:[~2010-09-09 18:58 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-08 23:02 [PATCH v2 1/3] MIPS: HIGHMEM DMA on noncoherent MIPS32 processors Kevin Cernekee
2010-09-08 23:02 ` Kevin Cernekee
2010-09-08 23:02 ` [PATCH 2/3] MIPS: Allow UserLocal on MIPS_R1 processors Kevin Cernekee
2010-09-08 23:02 ` Kevin Cernekee
2010-09-09 9:53 ` Ralf Baechle
2010-09-08 23:02 ` [PATCH 3/3] MIPS: DMA: Add plat_extra_sync_for_cpu() Kevin Cernekee
2010-09-08 23:02 ` Kevin Cernekee
2010-09-09 9:34 ` Sergei Shtylyov
2010-09-09 12:39 ` Kevin Cernekee
2011-05-19 13:30 ` Ralf Baechle
2010-09-09 17:10 ` David Daney
2010-09-09 17:34 ` Thomas Bogendoerfer
2010-09-09 18:35 ` Kevin Cernekee
2010-09-09 18:58 ` David Daney [this message]
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