@@ -881,6 +881,9 @@ struct controller *pcie_init(struct pcie_device *dev)
if (pdev->is_thunderbolt)
slot_cap |= PCI_EXP_SLTCAP_NCCS;
+ if (pdev->no_in_band_presence)
+ ctrl->inband_presence_disabled = 1;
+
ctrl->slot_cap = slot_cap;
mutex_init(&ctrl->ctrl_lock);
mutex_init(&ctrl->state_lock);
@@ -964,3 +967,21 @@ DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_QCOM, 0x0401,
PCI_CLASS_BRIDGE_PCI, 8, quirk_cmd_compl);
DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_HXT, 0x0401,
PCI_CLASS_BRIDGE_PCI, 8, quirk_cmd_compl);
+
+static void fixup_dell_nvme_backplane_switches(struct pci_dev *pdev)
+{
+ if (!pci_is_pcie(pdev))
+ return;
+
+ if (pci_pcie_type(pdev) != PCI_EXP_TYPE_DOWNSTREAM)
+ return;
+
+ if (pdev->subsystem_vendor != PCI_VENDOR_ID_DELL ||
+ pdev->subsystem_device != 0x1fc7)
+ return;
+
+ pdev->no_in_band_presence = 1;
+}
+DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_PLX, 0x9733,
+ PCI_CLASS_BRIDGE_PCI, 8,
+ fixup_dell_nvme_backplane_switches);
@@ -416,6 +416,7 @@ struct pci_dev {
unsigned int non_compliant_bars:1; /* Broken BARs; ignore them */
unsigned int is_probed:1; /* Device probing in progress */
unsigned int link_active_reporting:1;/* Device capable of reporting link active */
+ unsigned int no_in_band_presence:1; /* Device does not report in-band presence */
unsigned int no_vf_scan:1; /* Don't scan for VFs after IOV enablement */
pci_dev_flags_t dev_flags;
atomic_t enable_cnt; /* pci_enable_device has been called */
These switches are used to fornicate the motherboard's x16 PCIe ports into four x4 ports for NVMe drives. In conjunction with the storage backplane, the PDS bit reports only the out-of-band presence. The fact that inband presence is disabled is not reported in the slot capabilities 2 (SLTCAP2) register. Because this does not conform to the PCIe spec, add a quirk to let hotplug code know to expect and handle this. Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> --- drivers/pci/hotplug/pciehp_hpc.c | 21 +++++++++++++++++++++ include/linux/pci.h | 1 + 2 files changed, 22 insertions(+)