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

[Jeff Garzik]

David Woodhouse wrote:
> On Sun, 2004-03-21 at 17:34 -0500, Jeff Garzik wrote:
>
> > Tell driver writers to call a standard platform function with a 
> > {dma|mmio|pio|vmalloc} handle+size+len for {dma|mmio|pio|vmalloc} mmap 
> > setup, and {fault|nopage} handler.  ;-)  IMO they shouldn't have to care 
> > about the details.
>
>
> Don't let drivers see the {fault|nopage} handler. On most arches it can
> probably continue to be nopage(); other arches may use the
> newly-proposed fault() or perhaps just put all the PTEs in place up
> front. The driver shouldn't be given an opportunity to care.

If that's possible within the MM APIs... certainly.  Have a standard 
struct vm_operations_struct for dma, dma s/g, mmio, ... I presume?

	Jeff



-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/