The SMMUv3 driver, which may be built without CONFIG_PCI, will soon gain
PASID support.  Partially revert commit c6e9aefbf9db ("PCI/ATS: Remove
unused PRI and PASID stubs") to re-introduce the PASID stubs, and avoid
adding more #ifdefs to the SMMU driver.

Acked-by: Bjorn Helgaas <>
Reviewed-by: Eric Auger <>
Reviewed-by: Jonathan Cameron <>
Signed-off-by: Jean-Philippe Brucker <>
 include/linux/pci-ats.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/pci-ats.h b/include/linux/pci-ats.h
index 5d62e78946a3..d08f0869f121 100644
--- a/include/linux/pci-ats.h
+++ b/include/linux/pci-ats.h
@@ -33,6 +33,9 @@ void pci_disable_pasid(struct pci_dev *pdev);
 int pci_pasid_features(struct pci_dev *pdev);
 int pci_max_pasids(struct pci_dev *pdev);
 #else /* CONFIG_PCI_PASID */
+static inline int pci_enable_pasid(struct pci_dev *pdev, int features)
+{ return -EINVAL; }
+static inline void pci_disable_pasid(struct pci_dev *pdev) { }
 static inline int pci_pasid_features(struct pci_dev *pdev)
 { return -EINVAL; }
 static inline int pci_max_pasids(struct pci_dev *pdev)

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