linux-kernel - Re: [PATCH] MIPS: DMA: fix coherent alloc in non-coherent systems

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Message-ID: <54528595.8070009@imgtec.com>
Date:	Thu, 30 Oct 2014 11:38:13 -0700
From:	Leonid Yegoshin <Leonid.Yegoshin@...tec.com>
To:	James Hogan <james.hogan@...tec.com>
CC:	<linux-mips@...ux-mips.org>, <nbd@...nwrt.org>, <yanh@...ote.com>,
	<linux-kernel@...r.kernel.org>, <ralf@...ux-mips.org>,
	<alex.smith@...tec.com>, <taohl@...ote.com>, <chenhc@...ote.com>,
	<blogic@...nwrt.org>
Subject: Re: [PATCH] MIPS: DMA: fix coherent alloc in non-coherent systems

On 10/30/2014 03:07 AM, James Hogan wrote:
> Hi Leonid,
>
> On 30/10/14 01:48, Leonid Yegoshin wrote:
>> A default dma_alloc_coherent() fails to alloc a coherent memory on non-coherent
>> systems in case of device->coherent_dma_mask covering the whole memory space.
>>
>> In case of non-coherent systems the coherent memory on MIPS is restricted by
>> size of un-cachable segment and should be located in ZONE_DMA.
> Has this pretty much always been broken?
>
>
Yes, but it can be seen on MIPS32 EVA-based CPUs.
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