Re: [PATCH] PCI/ATS: Allow to enable ATS on VFs even if it is not enabled on PF
From: Joerg Roedel <joro@8bytes.org>
Date: 2023-02-16 10:23:36
Also in:
linux-iommu, linux-pci, lkml
On Wed, Feb 15, 2023 at 02:57:26PM -0600, Bjorn Helgaas wrote:
[+cc Will, Robin, Joerg for arm-smmu-v3 page size question] On Sun, Feb 12, 2023 at 08:14:48PM +0200, Leon Romanovsky wrote:quoted
On Wed, Feb 08, 2023 at 10:43:21AM -0800, Ganapatrao Kulkarni wrote:quoted
As per PCIe specification(section 10.5), If a VF implements an ATS capability, its associated PF must implement an ATS capability. The ATS Capabilities in VFs and their associated PFs are permitted to be enabled independently.
Well, the spec is one thing, existing hardware the other. Have you checked the history of the PF-before-VF requirement before making that change? It is possible that early PASID-capable hardware actually required PF-before-VF enablement of ATS. Regards, Joerg _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel