Re: [PATCH V3] PCI: Enable PASID when End-to-End TLP is supported by all bridges

[Sinan Kaya]

On 9/26/2018 12:22 PM, Raj, Ashok wrote:
> > pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap);
> > +	if (!(cap & PCI_EXP_DEVCAP2_E2ETLP))
> > +		return;
> Forgot to notice this.. I'm not sure if the same enforcement is
> required for devices that are RCIEP. The spec isn't clear about calling
> any excemption. Although it should be simple for devices to expose
> e2etlp support, but if they don't that should be ok, since there are
> nothing between itself and the root port.
>
> We are seeking help from our SIG reps, but thought I'll ask here as well
> if there are other opinions.

This patch actually broke the integrated endpoints like you were mentioning.
It was fixed by a follow up patch from nvidia guys.

https://github.com/torvalds/linux/commit/9d27e39d309c93025ae6aa97236af15bef2a5f1f#diff-a7f0acd715e991df5dfb450d2b9abebc