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cndm: Print PCIe configuration summary

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Signed-off-by: Alex Forencich <alex@alexforencich.com>
This commit is contained in:
Alex Forencich
2026-01-01 21:19:19 -08:00
parent 3e421e3cdd
commit c18aed2074
1 changed files with 58 additions and 1 deletions
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59
src/cndm/modules/cndm/cndm_main.c
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@@ -118,15 +118,72 @@ static int cndm_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
struct device *dev = &pdev->dev;
struct devlink *devlink;
struct cndm_dev *cdev;
struct pci_dev *bridge = pci_upstream_bridge(pdev);
int ret = 0;
dev_info(dev, DRIVER_NAME " PCI probe");
dev_info(dev, "Corundum device driver");
dev_info(dev, "Version " DRIVER_VERSION);
dev_info(dev, "Copyright (c) 2025 FPGA Ninja");
dev_info(dev, "Copyright (c) 2025 FPGA Ninja, LLC");
dev_info(dev, "https://fpga.ninja/");
dev_info(dev, "PCIe configuration summary:");
if (pdev->pcie_cap) {
u16 devctl;
u32 lnkcap;
u16 lnkctl;
u16 lnksta;
pci_read_config_word(pdev, pdev->pcie_cap + PCI_EXP_DEVCTL, &devctl);
pci_read_config_dword(pdev, pdev->pcie_cap + PCI_EXP_LNKCAP, &lnkcap);
pci_read_config_word(pdev, pdev->pcie_cap + PCI_EXP_LNKCTL, &lnkctl);
pci_read_config_word(pdev, pdev->pcie_cap + PCI_EXP_LNKSTA, &lnksta);
dev_info(dev, " Max payload size: %d bytes",
128 << ((devctl & PCI_EXP_DEVCTL_PAYLOAD) >> 5));
dev_info(dev, " Max read request size: %d bytes",
128 << ((devctl & PCI_EXP_DEVCTL_READRQ) >> 12));
dev_info(dev, " Read completion boundary: %d bytes",
lnkctl & PCI_EXP_LNKCTL_RCB ? 128 : 64);
dev_info(dev, " Link capability: gen %d x%d",
lnkcap & PCI_EXP_LNKCAP_SLS, (lnkcap & PCI_EXP_LNKCAP_MLW) >> 4);
dev_info(dev, " Link status: gen %d x%d",
lnksta & PCI_EXP_LNKSTA_CLS, (lnksta & PCI_EXP_LNKSTA_NLW) >> 4);
dev_info(dev, " Relaxed ordering: %s",
devctl & PCI_EXP_DEVCTL_RELAX_EN ? "enabled" : "disabled");
dev_info(dev, " Phantom functions: %s",
devctl & PCI_EXP_DEVCTL_PHANTOM ? "enabled" : "disabled");
dev_info(dev, " Extended tags: %s",
devctl & PCI_EXP_DEVCTL_EXT_TAG ? "enabled" : "disabled");
dev_info(dev, " No snoop: %s",
devctl & PCI_EXP_DEVCTL_NOSNOOP_EN ? "enabled" : "disabled");
}
#ifdef CONFIG_NUMA
dev_info(dev, " NUMA node: %d", pdev->dev.numa_node);
#endif
if (bridge) {
dev_info(dev, " Bridge PCI ID: %04x:%02x:%02x.%d", pci_domain_nr(bridge->bus),
bridge->bus->number, PCI_SLOT(bridge->devfn), PCI_FUNC(bridge->devfn));
}
if (bridge && bridge->pcie_cap) {
u32 lnkcap;
u16 lnksta;
pci_read_config_dword(bridge, bridge->pcie_cap + PCI_EXP_LNKCAP, &lnkcap);
pci_read_config_word(bridge, bridge->pcie_cap + PCI_EXP_LNKSTA, &lnksta);
dev_info(dev, " Bridge link capability: gen %d x%d",
lnkcap & PCI_EXP_LNKCAP_SLS, (lnkcap & PCI_EXP_LNKCAP_MLW) >> 4);
dev_info(dev, " Bridge link status: gen %d x%d",
lnksta & PCI_EXP_LNKSTA_CLS, (lnksta & PCI_EXP_LNKSTA_NLW) >> 4);
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0)
pcie_print_link_status(pdev);
#endif
devlink = cndm_devlink_alloc(dev);
if (!devlink)