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SubjectRe: DMA API issues
At Mon, 21 Jun 2004 20:26:39 -0700 (PDT),
Linus Torvalds wrote:
>
> On Mon, 21 Jun 2004, Linus Torvalds wrote:
> >
> > The argument at some point was that some architectures may not even _have_
> > a "struct page" for DMA memory, since it's not "normal" memory (ie "slow
> > memory" on m68k). However, I thought we all agreed that such a "struct
> > page" could be furnished if that architecture wants so support mmap'ing.
>
> .. which is not to say that we shouldn't have a "pci_mmap_pages()" thing
> _too_. Pretty clearly the easiest interface often is to just map the pages
> at mmap() time, and then we should just have a helper function to do that.
>
> I thought we did one already, but hey, maybe not.

I don't think we have such.

Russell has once proposed a similar one (but not pci-specific), and I
believe it makes sense for many drivers. We can hide the
architecture-specific cache handling inside the helper function, too.


Takashi
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