Re: pci_intr_alloc() vs pci_intr_establish() - retry type?

[Mouse <mouse%Rodents-Montreal.ORG@localhost>]

>> This reminds me - how does a driver know if any kind of MSI support
>> is even available?
> it shouldn't need to.

Okay, then I'm missing something.  I've seen hardware where enabling
MSI is something device-specific (a value in a register, typically),
meaning _something_ MD, presumably the driver, has to be involved if
MSI is to be used.

And how can a driver do this without knowing whether it's supported?

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