On 12/02/2008 02:44 PM, Stephen Hemminger wrote:
pci_find_ext_capability would succeed but all access to registers >= 256
would fail if MMCONFIG failed.
Your sentence seems self-contradicting to me. pci_find_ext_capability()
(!= pci_find_capability()) only tries to access registers >= 256, so I
don't see how it would succeed if *all* those accesses are failing.
P.s: you can look back into LKML for Linus discussion about why MMCONFIG
is broken anyway.
I was an active participant in one of those discussions (although it is
possible I missed a later one), so I am quite aware about the
limitations of MMCONFIG. But pci_find_ext_capability() looked to me a
good filter to check about those limitations().
This is not just about pciaer, for instance, it might be that a lot of
the SR-IOV code submitted recently assumes that if the corresponding
extended-capability can be detected, little checking needs to be done
afterwards.
Loic
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