linux-kernel - Re: [PATCH] arm: dma-mapping: move consistent_init to early

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Date:	Mon, 20 Dec 2010 15:22:02 -0800
From:	Saravana Kannan <skannan@...eaurora.org>
To:	Saravana Kannan <skannan@...eaurora.org>
CC:	Catalin Marinas <catalin.marinas@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	dwalker@...eaurora.org, linux-arm-msm@...r.kernel.org,
	Nicolas Pitre <nico@...vell.com>, linux-kernel@...r.kernel.org,
	Jeff Ohlstein <johlstei@...eaurora.org>,
	Tejun Heo <tj@...nel.org>, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm: dma-mapping: move consistent_init to      early_initcall

On 12/17/10 15:14, Saravana Kannan wrote:
> Catalin Marinas wrote:
>>> Russell,
>>>
>>> I agree with your point about using an API for purpose and not property.
>>> But I read Catalin's proposal as, let's treat secure domain as another
>>> DMA
>>> "device". If we make a conscious agreement to do that, then using the
>>> DMA
>>> API for secure domain would be "using it for its purpose" and we will
>>> make
>>> an effort to not break it with future updates. Of course, if we don't
>>> agree on that proposal, then we can't use the DMA API for secure domain
>>> stuff.
>>
>> If there is no better proposal, I'm for such extension to the DMA API.
>>  From the kernel perspecitve, the secure side is just another entity
>> that accesses the RAM directly. It's not a physically separate device
>> indeed but from a direct memory access perspective it can be treated
>> as any other device.
>>
>> In the DMA API we can fall back to the non-coherent ops when a NULL
>> struct device is passed. I assume in your code you already pass a NULL
>> device to dma_alloc_coherent().
>
> Russell,
>
> Would the extension of the DMA API as described above be acceptable to
> you? If not, can you please suggest an alternative that's acceptable to
> you?

Ping...

-Saravana

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