Roland Dreier <[email protected]> writes:
> > > - In spec hardware does not require MSI to generate interrupts
> > > Which leaves enabling MSI optional.
> >
> > Actually at least the Qlogic/Pathscale PCI Express ipath adapters
> > cannot generate INTx interrupts -- they definitely do require MSI to
> > operate.
>
> Oh yeah... when I first found out about this, I rechecked the PCI
> Express spec and found that in fact legacy INTx interrupts are
> optional. So the ipath adapters that require MSI do conform to the
> spec.
Hmm...
I find in section 6.1:
> In addition to PCI INTx compatible interrupt emulation, PCI Express
> requires support of MSI or MSI-X or both.
Which suggests that INTx support is required.
I do not find any wording that suggest the opposite.
I do see it stated that it is intended to EOL support for INTx at
some point.
Where did you see it mentioned that INTx was optional?
I do see it clearly stating that MSI is the preferred mechanism from
pci express.
Eric
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