PCI: Fix enabling of PASID on RC integrated endpoints

Set the eetlp_prefix_path on PCIE_EXP_TYPE_RC_END devices to allow PASID
to be enabled on them.  This fixes IOMMUv2 initialization on AMD Carrizo
APUs.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=201079
Fixes: 7ce3f912ae ("PCI: Enable PASID only if entire path supports End-End TLP prefixes")
Signed-off-by: Felix Kuehling <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index ec784009a36b8d7b694ebb8f0b26a3f3810636f5..201f9e5ff55c0a97e330d9dcf139f8d2cd96bad1 100644 (file)
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2074,6 +2074,7 @@ static void pci_configure_eetlp_prefix(struct pci_dev *dev)
 {
 #ifdef CONFIG_PCI_PASID
        struct pci_dev *bridge;
+       int pcie_type;
        u32 cap;
 
        if (!pci_is_pcie(dev))
@@ -2083,7 +2084,9 @@ static void pci_configure_eetlp_prefix(struct pci_dev *dev)
        if (!(cap & PCI_EXP_DEVCAP2_EE_PREFIX))
                return;
 
-       if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT)
+       pcie_type = pci_pcie_type(dev);
+       if (pcie_type == PCI_EXP_TYPE_ROOT_PORT ||
+           pcie_type == PCI_EXP_TYPE_RC_END)
                dev->eetlp_prefix_path = 1;
        else {
                bridge = pci_upstream_bridge(dev);