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[v4,12/13] PCI/ATS: Add PASID stubs

Message ID 20191219163033.2608177-13-jean-philippe@linaro.org
State Accepted
Commit 5a4549fd790500d7db94b7d2af6d60cee42110c3
Headers show
Series [v4,01/13] iommu/arm-smmu-v3: Drop __GFP_ZERO flag from DMA allocation | expand

Commit Message

Jean-Philippe Brucker Dec. 19, 2019, 4:30 p.m. UTC 
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 <bhelgaas@google.com>

Reviewed-by: Eric Auger <eric.auger@redhat.com>

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>

---
 include/linux/pci-ats.h | 3 +++
 1 file changed, 3 insertions(+)

-- 
2.24.1
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Patch

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)