From: Jonathan Cameron <jonathan.cameron@huawei.com>
To: Nicolin Chen <nicolinc@nvidia.com>
Cc: <jgg@nvidia.com>, <will@kernel.org>, <robin.murphy@arm.com>,
<bhelgaas@google.com>, <joro@8bytes.org>, <praan@google.com>,
<baolu.lu@linux.intel.com>, <kevin.tian@intel.com>,
<miko.lenczewski@arm.com>, <linux-arm-kernel@lists.infradead.org>,
<iommu@lists.linux.dev>, <linux-kernel@vger.kernel.org>,
<linux-pci@vger.kernel.org>, <dan.j.williams@intel.com>,
<vsethi@nvidia.com>, <linux-cxl@vger.kernel.org>
Subject: Re: [PATCH v3 2/3] PCI: Allow ATS to be always on for pre-CXL devices
Date: Mon, 9 Mar 2026 11:50:07 +0000 [thread overview]
Message-ID: <20260309115007.00005442@huawei.com> (raw)
In-Reply-To: <c715b10b49d50eea5429454108d4221c1a78efaf.1772833963.git.nicolinc@nvidia.com>
On Fri, 6 Mar 2026 15:41:16 -0800
Nicolin Chen <nicolinc@nvidia.com> wrote:
> Some NVIDIA GPU/NIC devices, although don't implement the CXL config space,
> they have many CXL-like properties. Call this kind "pre-CXL".
>
> Similar to CXL.cache capaiblity, these pre-CXL devices also require the ATS
> function even when their RIDs are IOMMU bypassed, i.e. keep ATS "always on"
> v.s. "on demand" when a non-zero PASID line gets enabled in SVA use cases.
>
> Introduce pci_dev_specific_ats_always_on() quirk function to scan a list of
> IDs for these device. Then, include it pci_ats_always_on().
>
> Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Seems like a reasonably tidy quirk.
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
next prev parent reply other threads:[~2026-03-09 11:50 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-06 23:41 [PATCH v3 0/3] Allow ATS to be always on for certain ATS-capable devices Nicolin Chen
2026-03-06 23:41 ` [PATCH v3 1/3] PCI: Allow ATS to be always on for CXL.cache capable devices Nicolin Chen
2026-03-08 20:49 ` Nirmoy Das
2026-03-08 20:53 ` Nirmoy Das
2026-03-09 11:48 ` Jonathan Cameron
2026-03-26 21:38 ` Bjorn Helgaas
2026-03-26 21:51 ` Jason Gunthorpe
2026-03-06 23:41 ` [PATCH v3 2/3] PCI: Allow ATS to be always on for pre-CXL devices Nicolin Chen
2026-03-08 20:50 ` Nirmoy Das
2026-03-08 20:54 ` Nirmoy Das
2026-03-09 11:50 ` Jonathan Cameron [this message]
2026-03-06 23:41 ` [PATCH v3 3/3] iommu/arm-smmu-v3: Allow ATS to be always on Nicolin Chen
2026-03-08 20:52 ` Nirmoy Das
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