PCI: Fix enabling of PASID on RC integrated endpoints (9d27e39d) · Commits · 戴 / test

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: ("PCI: Enable PASID only if entire path supports End-End TLP prefixes") Signed-off-by:

Felix Kuehling <Felix.Kuehling@amd.com> Signed-off-by:

Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/probe.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -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);

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