diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2025-10-31 14:28:57 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2025-11-03 19:27:41 -0800 |
| commit | c0c1262fbfbafe943dbccd5f97b500b72dbd2205 (patch) | |
| tree | ffbec5e258c463324104b776eb7a677a0ec4f623 /drivers | |
| parent | 3225f52cde56f46789a4972d3c54df8a4d75f022 (diff) | |
| download | linux-next-c0c1262fbfbafe943dbccd5f97b500b72dbd2205.tar.gz linux-next-c0c1262fbfbafe943dbccd5f97b500b72dbd2205.zip | |
PCI: Add PCIe Device 3 Extended Capability enumeration
PCIe r7.0 Section 7.7.9 Device 3 Extended Capability Structure, defines the
canonical location for determining the Flit Mode of a device. This status
is a dependency for PCIe IDE enabling. Add a new fm_enabled flag to 'struct
pci_dev'.
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Samuel Ortiz <sameo@rivosinc.com>
Cc: Alexey Kardashevskiy <aik@amd.com>
Cc: Xu Yilun <yilun.xu@linux.intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20251031212902.2256310-6-dan.j.williams@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pci/probe.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index d1467348c169..3b54f1720be5 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2283,6 +2283,17 @@ int pci_configure_extended_tags(struct pci_dev *dev, void *ign) return 0; } +static void pci_dev3_init(struct pci_dev *pdev) +{ + u16 cap = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_DEV3); + u32 val = 0; + + if (!cap) + return; + pci_read_config_dword(pdev, cap + PCI_DEV3_STA, &val); + pdev->fm_enabled = !!(val & PCI_DEV3_STA_SEGMENT); +} + /** * pcie_relaxed_ordering_enabled - Probe for PCIe relaxed ordering enable * @dev: PCI device to query @@ -2667,6 +2678,7 @@ static void pci_init_capabilities(struct pci_dev *dev) pci_doe_init(dev); /* Data Object Exchange */ pci_tph_init(dev); /* TLP Processing Hints */ pci_rebar_init(dev); /* Resizable BAR */ + pci_dev3_init(dev); /* Device 3 capabilities */ pci_ide_init(dev); /* Link Integrity and Data Encryption */ pcie_report_downtraining(dev); |