Bringing Up an Ethernet Interface Over PCIE

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Xavier
1

Hi,
we want to boot the endpoint system and boot the root port system together.
We can configure the endpoint system according to the following methods

cd /sys/kernel/config/pci_ep/
mkdir functions/pci_epf_tvnet/func1
echo 16 > functions/pci_epf_tvnet/func1/msi_interrupts
ln -s functions/pci_epf_tvnet/func1 controllers/141a0000.pcie_ep/
echo 1 > controllers/141a0000.pcie_ep/start

At this time, we must restart the root port system now.So,we can find ethx.
We don’t want to restart.We tried the pcie-rescan method.It can not worked.

echo 1 > /sys/bus/pci/rescan

We also try to integrate pcie_ tegra.c is compiled into .ko module.But it also failed.

ERROR: “__dw_pcie_write_dbi” [drivers/pci/dwc/pcie-tegra.ko] undefined!
ERROR: “dw_pcie_ep_linkup” [drivers/pci/dwc/pcie-tegra.ko] undefined!
ERROR: “dw_pcie_set_regs_available” [drivers/pci/dwc/pcie-tegra.ko] undefined!

We’d like to ask if it’s possible to solve this problem other than restarting the root system.

3

Please use the following changes to fix the build issues with compiling the PCIe driver as a loadable module

diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
index 6424c6340ac7..0f6fe378dd4d 100644
--- a/drivers/pci/dwc/pcie-designware-ep.c
+++ b/drivers/pci/dwc/pcie-designware-ep.c
@@ -29,6 +29,7 @@ void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)

        pci_epc_linkup(epc);
 }
+EXPORT_SYMBOL(dw_pcie_ep_linkup);

 static void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
 {
@@ -307,6 +308,7 @@ void dw_pcie_set_regs_available(struct dw_pcie *pci)
        dw_pcie_writew_dbi(pci, MSI_MESSAGE_CONTROL, ep->cached_msi_ctrl);
        dw_pcie_dbi_ro_wr_dis(pci);
 }
+EXPORT_SYMBOL(dw_pcie_set_regs_available);

 static int dw_pcie_ep_raise_irq(struct pci_epc *epc,
                                enum pci_epc_irq_type type, u8 interrupt_num)
diff --git a/drivers/pci/dwc/pcie-designware.c b/drivers/pci/dwc/pcie-designware.c
index e69b9f6fc21c..97f007ab752b 100644
--- a/drivers/pci/dwc/pcie-designware.c
+++ b/drivers/pci/dwc/pcie-designware.c
@@ -93,6 +93,7 @@ void __dw_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
        if (ret)
                dev_err(pci->dev, "write DBI address failed\n");
 }
+EXPORT_SYMBOL(__dw_pcie_write_dbi);

 static u32 dw_pcie_readl_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg)
 {
4

Thank you. I have compiled it

7

Hi jmumper2,

Please help to open a new topic if it’s still an issue. Thanks