A PCIe card behind a switch is unable to report its errors when SERR#
forwarding is not enabled on the PCIe# switch's secondary interface
according to the spec. This patch enables SERR# forwarding when the PCI
header type is bridge.
Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxxxxxx>
---
drivers/pci/pcie/aer/aerdrv_core.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
index 9803e3d..f248c17 100644
--- a/drivers/pci/pcie/aer/aerdrv_core.c
+++ b/drivers/pci/pcie/aer/aerdrv_core.c
@@ -37,21 +37,53 @@ module_param(nosourceid, bool, 0);
int pci_enable_pcie_error_reporting(struct pci_dev *dev)
{
+ u8 header_type;
+
if (pcie_aer_get_firmware_first(dev))
return -EIO;
if (!pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR))
return -EIO;
+ pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
+
+ /* needs to be a bridge/switch */
+ if (header_type == PCI_HEADER_TYPE_BRIDGE) {
+ u16 control;
+
+ /*
+ * A switch will not forward ERR_ messages coming from an
+ * endpoint if SERR# forwarding is not enabled.
+ * AER driver is checking the errors at the root only.
+ */
+ pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &control);
+ control |= PCI_BRIDGE_CTL_SERR;
+ pci_write_config_word(dev, PCI_BRIDGE_CONTROL, control);
+ }
+
return pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_AER_FLAGS);
}
EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting);
int pci_disable_pcie_error_reporting(struct pci_dev *dev)
{
+ u8 header_type;
+
if (pcie_aer_get_firmware_first(dev))
return -EIO;
+ pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
+
+ /* needs to be a bridge/switch */
+ if (header_type == PCI_HEADER_TYPE_BRIDGE) {
+ u16 control;
+
+ /* clear serr forwarding */
+ pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &control);
+ control &= ~PCI_BRIDGE_CTL_SERR;
+ pci_write_config_word(dev, PCI_BRIDGE_CONTROL, control);
+ }
+
return pcie_capability_clear_word(dev, PCI_EXP_DEVCTL,
PCI_EXP_AER_FLAGS);
}
--
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
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