Thanks for the report, Chris! Forwarding to linux-pci and Lukas for visibility. ---------- Forwarded message --------- From: <bugzilla-daemon@xxxxxxxxxx> Date: Thu, May 19, 2022 at 9:24 AM Subject: [Bug 216000] New: TBT storage hotplug fail when connect via thunderbolt dock To: <bjorn@xxxxxxxxxxx> https://bugzilla.kernel.org/show_bug.cgi?id=216000 Bug ID: 216000 Summary: TBT storage hotplug fail when connect via thunderbolt dock Product: Drivers Version: 2.5 Kernel Version: 5.17 and later Hardware: Intel OS: Linux Tree: Mainline Status: NEW Severity: high Priority: P1 Component: PCI Assignee: drivers_pci@xxxxxxxxxxxxxxxxxxxx Reporter: chris.chiu@xxxxxxxxxxxxx Regression: No Created attachment 300996 --> https://bugzilla.kernel.org/attachment.cgi?id=300996&action=edit output of lspci -vvv When I power on the adl-hx laptop with the thuderbolt dock(Dell WD22TB4) connected, the TBT storage can never be detected if I connect it via the dock. The kernel message shows "No bus number available for hot-added bridge" as follows. [ 102.073815] pcieport 0000:3a:01.0: pciehp: Slot(1-1): Card present [ 102.073825] pcieport 0000:3a:01.0: pciehp: Slot(1-1): Link Up [ 102.210491] pci 0000:3c:00.0: [8086:15da] type 01 class 0x060400 [ 102.210702] pci 0000:3c:00.0: enabling Extended Tags [ 102.211176] pci 0000:3c:00.0: supports D1 D2 [ 102.211179] pci 0000:3c:00.0: PME# supported from D0 D1 D2 D3hot D3cold [ 102.211510] pci 0000:3c:00.0: 8.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s PCIe x4 link at 0000:03:03.0 (capable of 31.504 Gb/s with 8.0 GT/s PCIe x4 link) [ 102.211732] pci 0000:3c:00.0: Adding to iommu group 30 [ 102.212093] pcieport 0000:3a:01.0: ASPM: current common clock configuration is inconsistent, reconfiguring [ 102.212172] pci 0000:3c:00.0: No bus number available for hot-added bridge The problem will be gone if I boot with the kernel parameter "pci=realloc,assign-busses,hpbussize=0x33" but we expect the `pciehp` should handle it w/o problem. Which part of system should reserve the PCIe bus number the hotplug device? --
