The mentioned modification makes sense.
But was this change already brought upstream?
And if so you you please share the commit (or backport) that does apply cleanly 
to the focal master-next tree?

** Changed in: ubuntu-z-systems
       Status: New => Incomplete

** Changed in: ubuntu-z-systems
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1874056

Title:
  [UBUNTU 20.04] s390x/pci: enumerate pci functions per physical adapter

Status in Ubuntu on IBM z Systems:
  Incomplete
Status in linux package in Ubuntu:
  New

Bug description:
  Today, the enumeration of PCI functions on s390x does not reflect
  which functions belongs to which physical adapter.

  Layout of a PCI function address on Linux:
  0000:00:00.0
  <root complex>:<bus>:<device>.<function>

  On s390x, each function is presented as individual root complex today,
  e.g.:

  PCHID 0100 VF1 0000:00:00.0
  PCHID 0100 VF23 0001:00:00.0
  PCHID 0200 VF1 0002:00:00.0
  OCHID 0100 VF17 0003:00:00.0

  On other platforms, the addresses correctly reflect the actual HW
  configuration. Some device drivers (mlx5 for Mellanox adapters) group
  functions of one physical adapter by checking which PCI functions have
  identical values for <root complex>:<bus>:<device>. We need to use the
  same enumeration scheme to achieve this functionality on s390x.

  In this case, the two physical functions of a Mellanox adapter need to
  get function number 0 and 1, and all virtual functions need to use the
  same <root complex>:<bus> numbers with function/device numbers
  counting up.

  Required result (example with 4 VFs per PF):

  PCHID 0100 PF 0 0000:00:00.0
  PCHID 0100 PF 1 0000:00:00.1
  PCHID 0100 PF 0 VF 0 0000:00:00.2
  PCHID 0100 PF 0 VF 1 0000:00:00.3
  PCHID 0100 PF 0 VF 2 0000:00:00.4
  PCHID 0100 PF 0 VF 3 0000:00:00.5
  PCHID 0100 PF 1 VF 0 0000:00:00.6
  PCHID 0100 PF 1 VF 1 0000:00:00.7
  PCHID 0100 PF 1 VF 2 0000:00:00.8
  PCHID 0100 PF 1 VF 3 0000:00:00.9

  PCHID 0200 PF 0 0001:00:00.0

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