Re: DMA API issues

[David Brownell]

James Bottomley wrote:
> On Fri, 2004-06-18 at 14:44, Ian Molton wrote:
>
> > > For example, if usbaudio uses usb_buffer_alloc to stream data,
> > > that eliminates dma bouncing.  That's dma_alloc_coherent at
> > > its core ... it should allocate from that 32K region.
> >
> > Agreed.
>
>
> There are complications to this: not all platforms can access PCI memory
> directly.  That's why ioremap and memcpy_toio and friends exist.  What
> should happen on these platforms?

I'm not following you.  This isn't using the PCI DMA calls.
These dots don't connect:  different hardware needs different
solutions.  How would those calls make dma_alloc_coherent work?

- Dave

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