Samsung PM991 NVME does not work on LX2160A system (Solidrun Honeycomb)

[Christoph Hellwig]

On Mon, Mar 20, 2023 at 11:11:00AM -0500, Bjorn Helgaas wrote:
> > The problem is that I am unable to use Samsung PM991 NVME there.
> > It is 2242 card so probably also DRAMless. Kernel says:
> > 
> > nvme 0004:01:00.0: Adding to iommu group 4
> > nvme nvme0: pci function 0004:01:00.0
> > nvme nvme0: missing or invalid SUBNQN field.
> > nvme nvme0: 1/0/0 default/read/poll queues
> > nvme 0004:01:00.0: VPD access failed.  This is likely a firmware bug on this device.  Contact the card vendor for a firmware update

I have no idea who even does the PCI vpd accesses here, but either
way there's not much we can do from the nvme driver side.

> > The SUBNQN part can be handled by adding quirk in nvme/core.c file
> > but that does not change situation. It also does not appear when
> > used in x86-64 system.

Although this suggests something is fishy with the config space
implementation for this particular hardware, and NVMe just happens
to trip it.