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

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Message-ID: <aW5za171oqq+7dBF@nvidia.com>
Date: Mon, 19 Jan 2026 10:09:47 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: <will@...nel.org>, <robin.murphy@....com>, <bhelgaas@...gle.com>,
	<joro@...tes.org>, <praan@...gle.com>, <baolu.lu@...ux.intel.com>,
	<kevin.tian@...el.com>, <miko.lenczewski@....com>,
	<linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>
Subject: Re: [PATCH RFCv1 2/3] PCI: Allow ATS to be always on for non-CXL
 NVIDIA GPUs

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