[PATCH v9 4/4] PCI: hisi: blacklist hip06/hip07 controllers behind SMMUv3
From: helgaas@kernel.org (Bjorn Helgaas)
Date: 2017-10-10 10:51:57
Also in:
linux-acpi, linux-iommu, linux-pci
On Fri, Oct 06, 2017 at 03:04:50PM +0100, Shameer Kolothum wrote:
The HiSilicon erratum 161010801 describes the limitation of HiSilicon platforms hip06/hip07 to support the SMMUv3 mappings for MSI transactions. PCIe controller on these platforms has to differentiate the MSI payload against other DMA payload and has to modify the MSI payload. This basically makes it difficult for this platforms to have a SMMU translation for MSI. In order to workaround this, ARM SMMUv3 driver requires a quirk to treat the MSI regions separately. Such a quirk is currently missing for DT based systems and therefore we need to blacklist the hip06/hip07 PCIe controllers. Signed-off-by: Shameer Kolothum <redacted>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
quoted hunk ↗ jump to hunk
--- drivers/pci/dwc/pcie-hisi.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)diff --git a/drivers/pci/dwc/pcie-hisi.c b/drivers/pci/dwc/pcie-hisi.c index a201791..6800747 100644 --- a/drivers/pci/dwc/pcie-hisi.c +++ b/drivers/pci/dwc/pcie-hisi.c@@ -270,6 +270,12 @@ static int hisi_pcie_probe(struct platform_device *pdev) struct resource *reg; int ret; + if ((IS_BUILTIN(CONFIG_ARM_SMMU_V3)) && + of_property_read_bool(dev->of_node, "iommu-map")) { + dev_warn(dev, "HiSilicon erratum 161010801: blacklisting PCIe controllers behind SMMUv3\n"); + return -ENODEV; + } + hisi_pcie = devm_kzalloc(dev, sizeof(*hisi_pcie), GFP_KERNEL); if (!hisi_pcie) return -ENOMEM;@@ -340,6 +346,12 @@ static int hisi_pcie_almost_ecam_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct pci_ecam_ops *ops; + if ((IS_BUILTIN(CONFIG_ARM_SMMU_V3)) && + of_property_read_bool(dev->of_node, "iommu-map")) { + dev_warn(dev, "HiSilicon erratum 161010801: blacklisting PCIe controllers behind SMMUv3\n"); + return -ENODEV; + } + ops = (struct pci_ecam_ops *)of_device_get_match_data(dev); return pci_host_common_probe(pdev, ops); }-- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html