[PATCH] Xen PCIbackend support for slot and bus reset (v3).

[konrad@kernel.org]

These patches had been posted in the past and had been reworked
to address reviews. The original concerns with the patches was
the complex logic of doing an workqueue (or thread) that would
do the FLR/bus/slot reset outside the PCI lock. That idea proved
buggy. The other idea of usurping the 'reset' SysFS didn't work
either - as the the generic code will complain loudly about this.

The best so far mechanism is to use the 'xl' toolstack usage
of 'do_flr' and make that work in Xen pciback.

 Documentation/ABI/testing/sysfs-driver-pciback |   95 ++++++++++++++
 drivers/xen/xen-pciback/pci_stub.c             |  163 +++++++++++++++++++-----
 drivers/xen/xen-pciback/xenbus.c               |    2 +-
 3 files changed, 224 insertions(+), 36 deletions(-)

Konrad Rzeszutek Wilk (7):
      xen-pciback: Document the various parameters and attributes in SysFS
      xen/pciback: Don't deadlock when unbinding.
      xen/pciback: Move the FLR code to a function.
      xen/pciback: Implement PCI reset slot or bus with 'do_flr' SysFS attribute
      xen/pciback: Include the domain id if removing the device whilst still in use
      xen/pciback: Print out the domain owning the device.
      xen/pciback: Remove tons of dereferences