Re: [PATCH RFCv1 2/3] PCI: Allow ATS to be always on for non-CXL NVIDIA GPUs

Nicolin Chen
2026-01-19T18:10:22Z

On Mon, Jan 19, 2026 at 02:00:26PM -0400, Jason Gunthorpe wrote:
> On Fri, Jan 16, 2026 at 08:56:41PM -0800, Nicolin Chen wrote:
> > Some non-CXL NVIDIA GPU devices support non-PASID ATS function when their
> > RIDs are IOMMU bypassed. This is slightly different than the default ATS
> > policy which would only enable ATS on demand: when a non-zero PASID line
> > is enabled in SVA use cases.
>
> Not support, require non-PASID ATS.
>
> I've been describing these devices as pre-CXL, in that they have many
> CXL like properties, including what motivated the prior patch, but do
> not implement the CXL config space.
>
> > +/* Some non-CXL devices support ATS on RID when it is IOMMU-bypassed */
>
> Require not support

I will fix these.

Thanks!
Nicolin