Re: [PATCH 2/4 v2] PCI: support ARI capability

[Roland Dreier <rdreier@cisco.com>]

 > ARI is an independent PCI Express extended capability. Multi-function
 > devices supporting this capability may use it to track dependency
 > between different functions and assign function group numbers to
 > these functions.

 > Another reason to keep this separated with SR-IOV is that after ARI
 > is enabled, PCI Express Endpoint may have non-zero slot number
 > (device number), which is different from traditional PCI Express
 > Endpoint.

OK, I guess.  Although I still don't see why we need a user-visible
option to control ARI independent of SR-IOV.  When would a user want to
enable CONFIG_PCI_ARI=y but not select CONFIG_PCI_IOV?  (Also, by the
way, why PCI_IOV instead of PCI_SR_IOV -- I assume in the future we may
have PCI_MR_IOV, and matching the PCI terminology is probably easier for
people to understand).

 - R.