Thomas Huth <th...@redhat.com> writes:
> On 16/07/2019 15.06, Markus Armbruster wrote:
[...]
>> 2. We want a way to Kconfig the PCI devices that work, i.e. only the
>> ones that support MSI or MSI-X.
>>
>> I don't like calling devices without any MSI capability "classic" or
>> "conventional devices". I'd rather call them "MSI-capable" or
>> "MSI/MSI-X devices".
>
> But you still need a config switch that you can set to enable the
> non-MSI devices ... what's so wrong with "conventional" if that's even
> the wording from the PCI SIG?
PCI Express Base Specification, rev. 3.0, section Terms and
Acronyms:
conventional PCI Behavior or features that conform to the PCI
Local Bus Specification.
In other words, "conventional PCI" is non-Express PCI.
A PCI Express device *must* support MSI or MSI-X. See PCI Express Base
Specification, rev. 3.0, section 7.7. MSI and MSI-X Capability
Structures.
A "conventional" PCI device *may* support MSI or MSI-X. See PCI Local
Bus Specification Revision 3.0 section 6.8. Message Signaled
Interrupts.
Conflating MSI-capable with conventional vs. Express is therefore wrong.
[...]
