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PCI/ATS: Ensure pci_ats_supported() is PF-aware for VFs

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Update pci_ats_supported() to additionally check the associated PF's
status when called on a VF. This ensures that PF-level quirks and
untrusted status are correctly propagated to VFs, providing a robust
support check that aligns with the kernel's PF-centric ATS configuration
model and is immune to the timing of VF-specific fixups.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Samiullah Khawaja <skhawaja@google.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Pranjal Shrivastava <praan@google.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Pranjal Shrivastava
2026-06-15 23:50:34 +00:00
committed by Joerg Roedel
parent 8cdeaa50ea
commit 4f2cd6091a
1 changed files with 5 additions and 2 deletions
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7
drivers/pci/ats.c
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@@ -40,10 +40,13 @@ void pci_ats_init(struct pci_dev *dev)
*/
bool pci_ats_supported(struct pci_dev *dev)
{
if (!dev->ats_cap)
if (!dev->ats_cap || dev->untrusted)
return false;
return (dev->untrusted == 0);
if (dev->is_virtfn)
return pci_ats_supported(pci_physfn(dev));
return true;
}
EXPORT_SYMBOL_GPL(pci_ats_supported);