After some further discussion, Don has come around to agreeing that
we cannot assume anything about devices which do not include an ACS
capability. Patch 1 of this series is therefore the same as sent
before. We have figured out though that some vendors are indicating
that they don't support peer-to-peer by providing an ACS capability
that is zero'd (ie. no capabilities). This makes sense as ACS is
largely for allowing control of peer-to-peer features and almost all
of the individual capabilities are optional for multifunction
devices that do not support peer-to-peer. This also simplifies our
flags filtering. I'm hoping we'll soon have some quirks for devices
that do not support peer-to-peer, but also do not provide an ACS
capability. Thanks,
Alex
---
Alex Williamson (2):
pci: Fix flaw in pci_acs_enabled()
pci: Differentiate ACS controllable from enabled
drivers/pci/pci.c | 68 +++++++++++++++++++++++++++++++++++++++++------------
1 file changed, 52 insertions(+), 16 deletions(-)
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