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Date:   Thu, 4 Feb 2021 08:51:23 -0400
From:   Jason Gunthorpe <jgg@nvidia.com>
To:     Alexey Kardashevskiy <aik@ozlabs.ru>
CC:     Max Gurtovoy <mgurtovoy@nvidia.com>,
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On Thu, Feb 04, 2021 at 12:05:22PM +1100, Alexey Kardashevskiy wrote:

> It is system firmware (==bios) which puts stuff in the device tree. The
> stuff is:
> 1. emulated pci devices (custom pci bridges), one per nvlink, emulated by
> the firmware, the driver is "ibmnpu" and it is a part on the nvidia driver;
> these are basically config space proxies to the cpu's side of nvlink.
> 2. interconnect information - which of 6 gpus nvlinks connected to which
> nvlink on the cpu side, and memory ranges.

So what is this vfio_nvlink driver supposed to be bound to? 

The "emulated pci devices"?

A real GPU function?

A real nvswitch function?

Something else?

Jason