svn commit: r367359 - stable/12/sys/dev/pci

[Alexander Motin]

Martin,

I've never seen such issues.  Could you send me verbose `dmesg`,
`devinfo -v` and `lspci -vv` outputs with and without the tunable set?
I guess your BIOS sets some things differently from all I've tested.

On 13.11.2020 11:38, martin at vx.sk wrote:
> I am encountering a problem with hw.pci.enable_aspm:
> 
> System: ASUS RS500A-E10-RS12U
> CPU: AMD EPYC 7502 32-Core.
> NVMe drive model: Micron 9300 PRO
> Number of NVMe drives: 10
> 
> Using X2APIC
> 
> When hw.pci.enable_aspm is enabled, PCIe hot plug of Micron NVMe drives
> does not work (including detection on boot) and the system reports the
> following errors for the vast majority of the drives:
> 
> Nov 13 15:11:30 xxx kernel: pcib9: Timed out waiting for Data Link Layer
> Active
> Nov 13 15:12:17 xxx kernel: pcib30: Timed out waiting for Data Link
> Layer Active
> Nov 13 15:12:44 xxx kernel: pcib29: Timed out waiting for Data Link
> Layer Active
> Nov 13 15:13:04 xxx kernel: pcib11: Timed out waiting for Data Link
> Layer Active
> ...
> 
> Flipping the tunable back to 0 workarounds the problem.
> 
> Reproduced both on latest head and stable/12.

-- 
Alexander Motin