[PATCH v3] powernv/pci: Add PHB register dump debugfs handle

[Gavin Shan]

On Thu, Jul 28, 2016 at 03:05:03PM +1000, Russell Currey wrote:
>On EEH events the kernel will print a dump of relevant registers.
>If EEH is unavailable (i.e. CONFIG_EEH is disabled, a new platform
>doesn't have EEH support, etc) this information isn't readily available.
>
>Add a new debugfs handler to trigger a PHB register dump, so that this
>information can be made available on demand.
>
>Signed-off-by: Russell Currey <ruscur at russell.cc>
>---

Reviewed-by: Gavin Shan <gwshan at linux.vnet.ibm.com>