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

From: Benjamin Herrenschmidt
Date: Tue Jun 16 2009 - 21:10:11 EST

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


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