From dmesg below, it seems this "broken device, retraining non-functional
downstream link at 2.5GT/s" is related due to the message of " pci
0000:4c:00.0: 32.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s PCIe
x16 link at 0000:4b:02.0 (capable of 504.112 Gb/s with 32.0 GT/s PCIe x16 link)
"
[ 296.128486] mlx5_core 0000:4c:00.0: E-Switch: Unload vfs: mode(LEGACY),
nvfs(0), necvfs(0), active vports(0)
[ 296.163512] mlx5_core 0000:4c:00.0: E-Switch: Disable: mode(LEGACY),
nvfs(0), necvfs(0), active vports(0)
[ 297.099419] mlx5_core 0000:4c:00.0: E-Switch: Disable: mode(LEGACY),
nvfs(0), necvfs(0), active vports(0)
[ 297.099456] mlx5_core 0000:4c:00.0: mlx5_wait_for_pages:916:(pid 6105):
Skipping wait for vf pages stage
[ 297.099463] mlx5_core 0000:4c:00.0: mlx5_wait_for_pages:916:(pid 6105):
Skipping wait for vf pages stage
[ 299.137166] mlx5_core 0000:4c:00.0: E-Switch: cleanup
[ 344.072271] pcieport 0000:4b:02.0: pciehp: Slot(7): Link Down
[ 344.072287] pcieport 0000:4b:02.0: pciehp: Slot(7): Card not present
[ 344.072936] {1}[Hardware Error]: Hardware error from APEI Generic Hardware
Error Source: 0
[ 344.072945] {1}[Hardware Error]: It has been corrected by h/w and requires
no further action
[ 344.072950] {1}[Hardware Error]: event severity: corrected
[ 344.072955] {1}[Hardware Error]: Error 0, type: corrected
[ 344.072959] {1}[Hardware Error]: section_type: PCIe error
[ 344.072962] {1}[Hardware Error]: port_type: 4, root port
[ 344.072967] {1}[Hardware Error]: version: 3.0
[ 344.072969] {1}[Hardware Error]: command: 0x0547, status: 0x0010
[ 344.072974] {1}[Hardware Error]: device_id: 0000:4b:02.0
[ 344.072976] {1}[Hardware Error]: slot: 7
[ 344.072978] {1}[Hardware Error]: secondary_bus: 0x4c
[ 344.072980] {1}[Hardware Error]: vendor_id: 0x8086, device_id: 0x0db0
[ 344.072982] {1}[Hardware Error]: class_code: 060400
[ 344.072985] {1}[Hardware Error]: bridge: secondary_status: 0x2000,
control: 0x0003
[ 344.073060] pcieport 0000:4b:02.0: AER: aer_status: 0x00000001, aer_mask:
0x00002000
[ 344.073073] pcieport 0000:4b:02.0: [ 0] RxErr (First)
[ 344.073076] pcieport 0000:4b:02.0: AER: aer_layer=Physical Layer,
aer_agent=Receiver ID
[ 378.664715] pcieport 0000:4b:02.0: pciehp: Slot(7): Card present
[ 379.699411] pcieport 0000:4b:02.0: broken device, retraining non-functional
downstream link at 2.5GT/s
[ 380.347436] pcieport 0000:4b:02.0: pciehp: Slot(7): No link
[ 380.347475] pcieport 0000:4b:02.0: pciehp: Slot(7): Card present
[ 380.347480] pcieport 0000:4b:02.0: pciehp: Slot(7): Link Up
[ 380.483696] pci 0000:4c:00.0: [15b3:1021] type 00 class 0x020000
[ 380.484000] pci 0000:4c:00.0: reg 0x10: [mem 0x00000000-0x01ffffff 64bit
pref]
[ 380.484456] pci 0000:4c:00.0: reg 0x30: [mem 0x00000000-0x000fffff pref]
[ 380.484565] pci 0000:4c:00.0: Max Payload Size set to 512 (was 128, max 512)
[ 380.486227] pci 0000:4c:00.0: PME# supported from D3cold
[ 380.486704] pci 0000:4c:00.0: reg 0x1a4: [mem 0x00000000-0x001fffff 64bit
pref]
[ 380.486711] pci 0000:4c:00.0: VF(n) BAR0 space: [mem 0x00000000-0x01ffffff
64bit pref] (contains BAR0 for 16 VFs)
[ 380.489300] pci 0000:4c:00.0: 32.000 Gb/s available PCIe bandwidth, limited
by 2.5 GT/s PCIe x16 link at 0000:4b:02.0 (capable of 504.112 Gb/s with 32.0
GT/s PCIe x16 link)
** Bug watch added: Linux Kernel Bug Tracker #218765
https://bugzilla.kernel.org/show_bug.cgi?id=218765
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https://bugs.launchpad.net/bugs/2085103
Title:
pci hot plug get "retraining non-functional downstream link at
2.5GT/s]"
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