On Thu, Sep 26, 2019 at 09:45:00AM -0700, Jeff Kirsher wrote:

From: Tony Nguyen <anthony.l.nguyen@intel.com>

The RDMA block does not advertise on the PCI bus or any other bus.

Huh?  How do you "know" where it is then?  Isn't is usually assigned to
a PCI device?

Thus the ice driver needs to provide access to the RDMA hardware block
via a virtual bus; utilize a multi-function device to provide this access.

This patch initializes the driver to support RDMA as well as creates
and registers a multi-function device for the RDMA driver to register to.
At this point the driver is fully initialized to register a platform
driver, however, can not yet register as the ops have not been
implemented.

We refer to the interaction of this platform device as Inter-Driver
Communication (IDC); where the platform device is referred to as the peer
device and the platform driver is referred to as the peer driver.

Again, no platform devices, unless it REALLY IS a platform device (i.e.
you are using device tree or platform data to find it.)  Is that what
you are doing here?

confused,

greg k-h