[PATCH v3 11/13] PCI/ATS: Add PRI stubs

[Nicolin Chen <nicolinc@nvidia.com>]

From: Jean-Philippe Brucker <jean-philippe@linaro.org>

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

Link: https://lore.kernel.org/iommu/20201112125519.3987595-8-jean-philippe@linaro.org/
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
[nicolinc: drop stale APIs]
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
 include/linux/pci-ats.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/pci-ats.h b/include/linux/pci-ats.h
index f3723b6861294..07d24c1c3acdb 100644
--- a/include/linux/pci-ats.h
+++ b/include/linux/pci-ats.h
@@ -36,6 +36,11 @@ int pci_reset_pri(struct pci_dev *pdev);
 int pci_prg_resp_pasid_required(struct pci_dev *pdev);
 bool pci_pri_supported(struct pci_dev *pdev);
 #else
+static inline int pci_enable_pri(struct pci_dev *pdev, u32 reqs)
+{ return -ENODEV; }
+static inline void pci_disable_pri(struct pci_dev *pdev) { }
+static inline int pci_reset_pri(struct pci_dev *pdev)
+{ return -ENODEV; }
 static inline bool pci_pri_supported(struct pci_dev *pdev)
 { return false; }
 #endif /* CONFIG_PCI_PRI */
-- 
2.43.0