On Thu, Dec 08, 2005 at 04:13:52PM -0600, Kumar Gala ([email protected]) wrote:
> On Wed, 23 Nov 2005, Jeff Garzik wrote:
>
> > Alan Cox wrote:
> > >>Additionally, current IOAT is memory->memory. I would love to be able
> > >>to convince Intel to add transforms and checksums,
> > >
> > >
> > > Not just transforms but also masks and maybe even merges and textures
> > > would be rather handy 8)
> >
> >
> > Ah yes: I totally forgot to mention XOR.
> >
> > Software RAID would love that.
>
> A number of embedded processors already have HW that does these kinda of
> things. On Freescale PPC processors there have been general purpose DMA
> engines for mem<->mem and more recently and additional crypto engines that
> allow for hashing, XOR, and security.
>
> I'm actually searching for any examples of drivers that deal with the
> issues related to DMA'ng directly two and from user space memory.
>
> I have an ioctl based driver that does copies back and forth between user
> and kernel space and would like to remove that since the crypto engine has
> full scatter/gather capability.
>
> The only significant effort I've come across is Peter Chubb's work for
> user mode drivers which has some code for handling pinning of the user
> space memory and what looks like generation of a scatter list.
Acrypto supports crypto processing directly in userspace pages.
In 2.6 it is quite easy using get_user_pages().
> - kumar
>
> -
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Evgeniy Polyakov
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