linux-kernel - Re: PowerPC PCI DMA issues (prefetch/coherency?)

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Date:	Wed, 17 Jun 2009 11:07:30 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	arnd@...db.de, scottwood@...escale.com, chris.pringle@...el.com,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: PowerPC PCI DMA issues (prefetch/coherency?)

On Wed, 2009-06-17 at 09:37 +0900, FUJITA Tomonori wrote:
> 
> dma_cache_sync is supposed to be used only with the buffers that
> dma_alloc_noncoherent() returns. On architecutures that maps
> dma_alloc_noncoherent to dma_alloc_coherent, dma_cache_sync() is
> supposed to be NOP.
> 
Or at least a sync() on powerpc but yeah, I see. We should probably do
that.

Cheers,
Ben.


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