NTB: switchtec: Add link event notifier callback
authorLogan Gunthorpe <logang@deltatee.com>
Thu, 3 Aug 2017 18:19:43 +0000 (12:19 -0600)
committerJon Mason <jdmason@kudzu.us>
Sun, 19 Nov 2017 01:37:11 +0000 (20:37 -0500)
commit48c302dc8f3acc1b0ef56a28569bc6a35b9b0e60
tree5fd88d18529d648ca29527592fa1e51004f17cc0
parentc082b04c9d40f69dacd93a151db114299f5de6eb
NTB: switchtec: Add link event notifier callback

In order for the Switchtec NTB code to handle link change events we
create a notifier callback in the switchtec code which gets called
whenever an appropriate event interrupt occurs.

In order to preserve userspace's ability to follow these events,
we compare the event count with a stored copy from last time we
checked.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Stephen Bates <sbates@raithlin.com>
Reviewed-by: Kurt Schwemmer <kurt.schwemmer@microsemi.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
drivers/pci/switch/switchtec.c
include/linux/switchtec.h