Re: PCI IO ECS access is no longer possible for AMD family 17h

[Pali Rohár]

Hello Rostyslav, you sent an email addressed to me, but you forgot to
put my email address into recipients. So I have not received it.
But luckily, today I found your email by a chance in lkml archive:
https://lore.kernel.org/lkml/CAJDH93uE+foFfRAXVJ48-PYvEUsbpEu_-BVoG-5HsDG66yY7AQ@xxxxxxxxxxxxxx/

On Monday 03 March 2025 10:21:25 Rostyslav Khudolii wrote:
> Hi,
> 
> > Rostyslav, I would like to ask you, do you have patches / updates for
> > enabling the EnableCf8ExtCfg bit for AMD 17h+ family? I could try to
> > adjust my lspci changes for new machines.
> 
> Pali, sorry for the late reply. Do I understand correctly, that even
> though you have access to the ECS via
> the MMCFG you still want the legacy (direct IO) to work for the
> debugging purposes? I can prepare a
> simple patch that will allow you to do so if that's the case.

Yes, I would like to get access to ECS via CF8/CFC direct IO for
debugging purposes, even though MMCFG is enabled and used.

If you can send me a simple patch or any sample / idea how to do it,
I would be very happy. I was not able to figure out how to enable ECS
over CF8/CFC.

Pali