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

Benjamin Herrenschmidt
2009-06-17T01:10:07Z

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.