[PATCH for-rc] PCI: Fix enabling of PASID on RC integrated endpoints

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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.

Fixes: 7ce3f912ae ("PCI: Enable PASID only if entire path supports End-End TLP prefixes")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=201079
Signed-off-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
---
 drivers/pci/probe.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index ec78400..201f9e5 100644
--- 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);
-- 
2.7.4




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