[dpdk-dev] [PATCH v4 0/4] Enable hotplug in vfio

[Jeff Guo <jia.guo@intel.com>]

As we may know that the process of hotplug is different between igb_uio
and vfio. For igb_uio, it could use uevent notification and memory
failure handle mechanism for hot-unplug. But for vfio, when device is be
hot-unplugged, the uevent can not be detected immediately, because of the
vfio kernel module will use a special mechanism to guaranty the pci
device would not be deleted until the user space release the resources,
so it will use another req notifier event at first to notify user space
to release resources for hotplug.

This patch will add a new interrupt type of req notifier in eal interrupt,
and add the new interrupt handler in pci device to handle the req device
event. When the req notifier be detected, it can trigger the device event
callback process to process for hot-unplug. With this mechanism, hotplug
could be enable in vfio.

patchset history:
v4->v3:
add some part of uninitialize for req handler.

v3->v2:
change some commit log and coding style and typo.

v2->v1:
change the rte_dev_event_callback_prcess from internal to external api
for bus or app usage.
change some code logic.

Jeff Guo (4):
  eal: add a new req notifier to eal interrupt
  eal: modify device event callback process func
  pci: add req handler field to generic pci device
  vfio: enable vfio hotplug by req notifier handler

 app/test-pmd/testpmd.c                             |   4 +-
 drivers/bus/pci/linux/pci_vfio.c                   | 122 +++++++++++++++++++++
 drivers/bus/pci/pci_common.c                       |  10 ++
 drivers/bus/pci/rte_bus_pci.h                      |   1 +
 lib/librte_eal/bsdapp/eal/eal_dev.c                |   8 ++
 lib/librte_eal/common/eal_common_dev.c             |   5 +-
 lib/librte_eal/common/eal_private.h                |  12 --
 lib/librte_eal/common/include/rte_dev.h            |  18 ++-
 lib/librte_eal/common/include/rte_eal_interrupts.h |   1 +
 lib/librte_eal/linuxapp/eal/eal_dev.c              |   2 +-
 lib/librte_eal/linuxapp/eal/eal_interrupts.c       |  71 ++++++++++++
 lib/librte_eal/rte_eal_version.map                 |   1 +
 12 files changed, 237 insertions(+), 18 deletions(-)

-- 
2.7.4