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Re: [PATCH][MIPS] add DMA declare coherent memory support

To: Thomas Bogendoerfer <>
Subject: Re: [PATCH][MIPS] add DMA declare coherent memory support
From: Yuasa Yoichi <>
Date: Fri, 5 Jun 2009 12:03:01 +0900
Cc: Ralf Baechle <>, linux-mips <>
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2009/6/4 Thomas Bogendoerfer <>:
> On Thu, Jun 04, 2009 at 12:16:04AM +0900, Yoichi Yuasa wrote:
>> Signed-off-by: Yoichi Yuasa <>
> a little bit more description what this is all about would be quite
> helpful. I also see a problem as there is at least one MIPS machine
> (SGI IP28), which doesn't support coherent memory (at least not without
> playing dirty games with the memory controller, which in return makes
> the machine slow).

Some drivers require dma_declare_coherent_memory() (eg.
It is used to driver's local memory allocation with dma_alloc_coherent().


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