[RFC 00/11] opencapi: enable card reset and link retraining

[Frederic Barrat]

This is the linux part of the work to use the PCI hotplug framework to
control an opencapi card so that it can be reset and re-read after
flashing a new FPGA image.

It needs support in skiboot:
http://patchwork.ozlabs.org/project/skiboot/list/?series=114803
On an old skiboot, it will do nothing.

A virtual PCI slot is created for the opencapi adapter, and its state
can be controlled through the pnv-php hotplug driver:

  echo 0|1 > /sys/bus/pci/slots/OPENCAPI-<...>/power

Note that the power to the card is not really turned off, as the card
needs to stay on to be flashed with a new image. Instead the card is
placed in reset.

The first part of the series mostly deals with the pci/ioda state, as
the devices can now go away and the state needs to be cleaned up.

The second part is modifications to the hotplug driver on powernv, so
that a virtual slot is created for the opencapi adapters found in the
device tree



Frederic Barrat (11):
  powerpc/powernv/ioda: Fix ref count for devices with their own PE
  powerpc/powernv/ioda: Protect PE list
  powerpc/powernv/ioda: set up PE on opencapi device when enabling
  powerpc/powernv/ioda: Release opencapi device
  powerpc/powernv/ioda: Find opencapi slot for a device node
  pci/hotplug/pnv-php: Remove erroneous warning
  pci/hotplug/pnv-php: Improve error msg on power state change failure
  pci/hotplug/pnv-php: Register opencapi slots
  pci/hotplug/pnv-php: Relax check when disabling slot
  pci/hotplug/pnv-php: Wrap warnings in macro
  ocxl: Add PCI hotplug dependency to Kconfig

 arch/powerpc/include/asm/pnv-pci.h        |   1 +
 arch/powerpc/platforms/powernv/pci-ioda.c | 106 ++++++++++++++--------
 arch/powerpc/platforms/powernv/pci.c      |  10 +-
 drivers/misc/ocxl/Kconfig                 |   1 +
 drivers/pci/hotplug/pnv_php.c             |  66 ++++++++------
 5 files changed, 115 insertions(+), 69 deletions(-)

-- 
2.21.0