[dpdk-dev] [PATCH v3] crypto/ccp: enable IOMMU for CCP

[Somalapuram, Amaranath]

[Public]



-----Original Message-----
From: Thomas Monjalon <thomas at monjalon.net> 
Sent: Friday, May 28, 2021 12:51 PM
To: Somalapuram, Amaranath <Amaranath.Somalapuram at amd.com>
Cc: David Marchand <david.marchand at redhat.com>; dev <dev at dpdk.org>; Akhil Goyal <gakhil at marvell.com>; Kumar, Ravi1 <Ravi1.Kumar at amd.com>; Song, Keesang <Keesang.Song at amd.com>
Subject: Re: [dpdk-dev] [PATCH v3] crypto/ccp: enable IOMMU for CCP

[CAUTION: External Email]

28/05/2021 07:02, Somalapuram, Amaranath:
> From: Thomas Monjalon <thomas at monjalon.net>
> > 27/05/2021 15:24, David Marchand:
> > > On Fri, Dec 25, 2020 at 9:06 AM <asomalap at amd.com> wrote:
> > > > From: Amaranath Somalapuram <Amaranath.Somalapuram at amd.com>
> > > >
> > > > CCP use vdev framework, and vdev framework don’t support IOMMU.
> > > > Adding custom IOMMU support for AMD CCP driver.
> > >
> > > I am currently looking at pci bus patches/cleanups.
> > > I ended up looking at crypto/ccp.
> > > This driver code contains a lot of features duplicated with the pci bus.
> > >
> > > Why is the ccp driver not a PCI driver?
> >
> > Indeed it looks abusing vdev.
> > We should drop all the code duplicating the PCI bus driver.
> > If nothing else is done, it would mean breaking the probing of this 
> > driver.
> >
> > Adding more people in Cc list to have a fix before it is broken, thanks.
>
> Enable IOMMU for vdev was not supported in DPDK.
> I can remove all the duplicating code after I test the CCP with IOMMU.

I think you didn't get it.
It should not be a vdev.
We want to switch the driver to a true PCI device, and remove all the code copied from the PCI bus driver.

We will implement CCP as true PCI device.