PCI/ATS: Add pci_pri_supported() to check device or associated PF
For SR-IOV, the PF PRI is shared between the PF and any associated VFs, and the PRI Capability is allowed for PFs but not for VFs. Searching for the PRI Capability on a VF always fails, even if its associated PF supports PRI. Add pci_pri_supported() to check whether device or its associated PF supports PRI. [bhelgaas: commit log, avoid "!!"] Fixes: b16d0cb9 ("iommu/vt-d: Always enable PASID/PRI PCI capabilities before ATS") Link: https://lore.kernel.org/r/1595543849-19692-1-git-send-email-ashok.raj@intel.com Signed-off-by:Ashok Raj <ashok.raj@intel.com> Signed-off-by:
Bjorn Helgaas <bhelgaas@google.com> Reviewed-by:
Lu Baolu <baolu.lu@linux.intel.com> Acked-by:
Joerg Roedel <jroedel@suse.de> Cc: stable@vger.kernel.org # v4.4+
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1c026a18
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