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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 -- Sent by an employee of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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