Re: can device drivers return non-ram via vm_ops->nopage?

[Arjan van de Ven]

On Sun, 2004-03-21 at 00:54, Russell King wrote:
> On Sat, Mar 20, 2004 at 02:45:18PM -0800, William Lee Irwin III wrote:
> > Is there any possibility of an extension to remap_area_pages() that
> > could resolve this? I can't say I fully understood and/or remember
> > the issue with it that you pointed out.
> 
> The issues are:
> 
> 1. ALSA wants to mmap the buffer used to transfer data to/from the
>    card into user space.  This buffer may be direct-mapped RAM,
>    memory allocated via dma_alloc_coherent(), an on-device buffer,
>    or anything else.


fwiw an ideal DRI/DRM driver would do the same with the video cards
ringbuffer so the problem isn't unique to alsa, it's a generic issue.

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