linux-kernel - Re: [RFC] arm: DMA-API contiguous cacheable memory

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Message-ID: <20150519220936.GL2067@n2100.arm.linux.org.uk>
Date:	Tue, 19 May 2015 23:09:36 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Lorenzo Nava <lorenx4@...il.com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] arm: DMA-API contiguous cacheable memory

On Wed, May 20, 2015 at 12:05:54AM +0200, Lorenzo Nava wrote:
> Maybe my interpretation of dma_alloc_coherent() is not correct, and
> the coherency can be managed using the dma_sync_single_for_* functions
> and it doesn't require hardware mechanism.

dma_sync_single_for_* are only for use with the streaming DMA API,
where you must have already mapped the buffer using one of the
dma_map_* functions.  Anything other than that is abusing the API.

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