[PATCH 0/6] Ancillary bus implementation and SOF multi-client support

[Jason Gunthorpe]

On Thu, Oct 01, 2020 at 02:55:26PM +0200, gregkh at linuxfoundation.org wrote:
> I agree, but with just one user (in a very odd way I do have to say,
> more on that on the review of that specific patch), it's hard to judge
> if this is useful are not, right?

I agree with you completely, this SOF usage is quite weird and not
what I think is representative. I never imagined this stuff would be
used inside a single driver in a single subsystem. It was imagined for
cross-subsystem sharing.

> So, what happened to at least the Intel SOF driver usage?  That was the
> original user of this bus (before it was renamed), surely that patchset
> should be floating around somewhere in Intel, right?

The first user was irdma (the New Intel RDMA driver):

https://lore.kernel.org/linux-rdma/20200520070415.3392210-1-jeffrey.t.kirsher@intel.com/

(look at patch 1, search for virtbus)

I kicked it off when I said I was sick of RDMA RoCE drivers
re-implementing the driver core register/unregister and module
management to share a PCI device between netdev and RDMA.

This has been going on for almost two years now. I did not think it
would be so hard.

Jason