Hi Tim， Our test engineer use ubuntu 24.04 reproduce this issue. They do hot repmove and hot plug on nvme device. And you can see, the nvme 7 downgrade to 2.5GT/s while nvme 6 is normal pcie link, they are the same type of nvme device. kern :info : [ 288.320053] pcieport 0000:86:02.0: pciehp: Slot(30): Card present kern :info : [ 289.115131] pci 0000:87:00.0: [1344:51c3] type 00 class 0x010802 PCIe Endpoint kern :info : [ 289.115176] pci 0000:87:00.0: BAR 0 [mem 0x00000000-0x0003ffff 64bit] kern :info : [ 289.115226] pci 0000:87:00.0: ROM [mem 0x00000000-0x0003ffff pref] kern :info : [ 289.115241] pci 0000:87:00.0: Max Payload Size set to 512 (was 128, max 512) kern :info : [ 289.115375] pci 0000:87:00.0: PME# supported from D0 D1 D3hot kern :info : [ 289.115816] pci 0000:87:00.0: Adding to iommu group 40 kern :info : [ 289.118666] pcieport 0000:86:02.0: ASPM: current common clock configuration is inconsistent, reconfiguring kern :info : [ 289.124069] pcieport 0000:86:02.0: bridge window [io 0x1000-0x0fff] to [bus 87] add_size 1000 kern :info : [ 289.124085] pcieport 0000:86:02.0: bridge window [io size 0x1000]: can't assign; no space kern :info : [ 289.124089] pcieport 0000:86:02.0: bridge window [io size 0x1000]: failed to assign kern :info : [ 289.124092] pcieport 0000:86:02.0: bridge window [io size 0x1000]: can't assign; no space kern :info : [ 289.124095] pcieport 0000:86:02.0: bridge window [io size 0x1000]: failed to assign kern :info : [ 289.124099] pci 0000:87:00.0: BAR 0 [mem 0xd4600000-0xd463ffff 64bit]: assigned kern :info : [ 289.124112] pci 0000:87:00.0: ROM [mem 0xd4640000-0xd467ffff pref]: assigned kern :info : [ 289.124115] pcieport 0000:86:02.0: PCI bridge to [bus 87] kern :info : [ 289.124121] pcieport 0000:86:02.0: bridge window [mem 0xd4600000-0xd46fffff] kern :info : [ 289.124125] pcieport 0000:86:02.0: bridge window [mem 0x1e6000000000-0x1e60001fffff 64bit pref] kern :info : [ 289.124694] nvme nvme6: pci function 0000:87:00.0 kern :info : [ 289.124713] nvme 0000:87:00.0: enabling device (0000 -> 0002) kern :info : [ 293.734427] nvme nvme6: 255/0/0 default/read/poll queues
kern :info : [ 296.227642] pcieport 0000:86:04.0: pciehp: Slot(31): Card present kern :info : [ 296.355148] pci 0000:88:00.0: [1344:51c3] type 00 class 0x010802 PCIe Endpoint kern :info : [ 296.355199] pci 0000:88:00.0: BAR 0 [mem 0x00000000-0x0003ffff 64bit] kern :info : [ 296.355257] pci 0000:88:00.0: ROM [mem 0x00000000-0x0003ffff pref] kern :info : [ 296.355275] pci 0000:88:00.0: Max Payload Size set to 512 (was 128, max 512) kern :info : [ 296.355438] pci 0000:88:00.0: PME# supported from D0 D1 D3hot kern :info : [ 296.355543] pci 0000:88:00.0: 8.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s PCIe x4 link at 0000:86:04.0 (capable of 63.012 Gb/s with 16.0 GT/s PCIe x4 link) kern :info : [ 296.355977] pci 0000:88:00.0: Adding to iommu group 41 kern :info : [ 296.359042] pcieport 0000:86:04.0: ASPM: current common clock configuration is inconsistent, reconfiguring kern :info : [ 296.362046] pcieport 0000:86:04.0: bridge window [io 0x1000-0x0fff] to [bus 88] add_size 1000 kern :info : [ 296.362072] pcieport 0000:86:04.0: bridge window [io size 0x1000]: can't assign; no space kern :info : [ 296.362079] pcieport 0000:86:04.0: bridge window [io size 0x1000]: failed to assign kern :info : [ 296.362086] pcieport 0000:86:04.0: bridge window [io size 0x1000]: can't assign; no space kern :info : [ 296.362090] pcieport 0000:86:04.0: bridge window [io size 0x1000]: failed to assign kern :info : [ 296.362097] pci 0000:88:00.0: BAR 0 [mem 0xd4500000-0xd453ffff 64bit]: assigned kern :info : [ 296.362119] pci 0000:88:00.0: ROM [mem 0xd4540000-0xd457ffff pref]: assigned kern :info : [ 296.362125] pcieport 0000:86:04.0: PCI bridge to [bus 88] kern :info : [ 296.362133] pcieport 0000:86:04.0: bridge window [mem 0xd4500000-0xd45fffff] kern :info : [ 296.362140] pcieport 0000:86:04.0: bridge window [mem 0x1e6000200000-0x1e60003fffff 64bit pref] kern :info : [ 296.362653] nvme nvme7: pci function 0000:88:00.0 kern :info : [ 296.362672] nvme 0000:88:00.0: enabling device (0000 -> 0002) kern :info : [ 301.227714] nvme nvme7: 255/0/0 default/read/poll queues -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2100828 Title: ubuntu-24.04: Root port link speed degradation to 2.5GT/s after nvme hot plug To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2100828/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
