linux-kernel - RE: [PATCH v3 1/1] PCI: Add translated request only flag for pci_enable

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Message-ID: <BN9PR11MB5276FA24C99DB1E268211ACF8CDA9@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Mon, 6 Feb 2023 04:28:15 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>,
        Bjorn Helgaas <helgaas@...nel.org>
CC:     Baolu Lu <baolu.lu@...ux.intel.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rodel, Jorg" <jroedel@...e.de>,
        Matt Fagnani <matt.fagnani@...l.net>,
        Christian König <christian.koenig@....com>,
        Vasant Hegde <vasant.hegde@....com>,
        "Zhu, Tony" <tony.zhu@...el.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Alex Williamson" <alex.williamson@...hat.com>
Subject: RE: [PATCH v3 1/1] PCI: Add translated request only flag for
 pci_enable_pasid()

> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Saturday, February 4, 2023 2:53 AM
>
> The AMD defect is some BIOS's on some of their SOC's don't report ACS
> for the MFD, even though it does presumably implement ACS.
> 

If that is the case looks AMD driver should implement a pci quirk so
pci_dev_specific_acs_enabled() can correctly report to meet pci
core requirement.