[Bug 289748] ahci driver not attached on New supermicro board H13SSW in at least 14.3 and CURRENT

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289748

Andriy Gapon <avg@FreeBSD.org> changed:

           What    |Removed                     |Added
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             Status|New                         |Open
                 CC|                            |avg@FreeBSD.org,
                   |                            |jhb@FreeBSD.org

--- Comment #8 from Andriy Gapon <avg@FreeBSD.org> ---
Regarding potential code improvements.

It seems that ahci_pci code uses some low level accesses for MSI-X information.
Those probably originate from early days of MSI-X support in FreeBSD.
I think that, e.g., a function like ahci_pci_read_msix_bars() could be replaced
with or re-implemented in terms of standard pci bus methods like
pci_msix_table_bar.
But that's a minor point.

I think that a failure to allocate one of those BARs should not translate to a
failure to attach.
It should simply disable MSI-X for the device and proceed with other interrupt
modes.

BTW, I wonder if pci_msix_table_bar_method and pci_msix_pba_bar_method, or even
pci_read_cap before them, could do some verification of the MSI-X BARs.

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