[Bug 285993] nvme device breakage in 14.2 STABLE n270867-25df691800f0

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285993

--- Comment #17 from Jim Long <freebsd-bugzilla@umpquanet.com> ---
Thank you, John, for chiming in.

No, I'm not real familiar with examining PCI-E registers, but I've been on a
crash course with the pciconf man page lately, so I'll give it a whack:

pcib10@pci65526:0:2:0:  class=0x060400 rev=0x04 hdr=0x01 vendor=0x8086
device=0x2032 subvendor=0x1028 subdevice=0x0738
    cap 0d[40] = PCI Bridge subvendor=0x1028 subdevice=0x0738
    cap 05[60] = MSI supports 2 messages, vector masks 
    cap 10[90] = PCI-Express 2 root port max data 128(256) ARI disabled
                 max read 128
                 link x4(x4) speed 8.0(8.0) ASPM L1(L1)
                 slot 91 power limit 0 mW HotPlug(present) surprise
    cap 01[e0] = powerspec 3  supports D0 D3  current D0
    ecap 000b[100] = Vendor [1] ID 0002 Rev 0 Length 12
    ecap 000d[110] = ACS 1 Source Validation disabled, Translation Blocking
disabled
                     P2P Req Redirect disabled, P2P Cmpl Redirect disabled
                     P2P Upstream Forwarding disabled, P2P Egress Control
unavailable
                     P2P Direct Translated unavailable, Enhanced Capability
unavailable
    ecap 0001[148] = AER 1 0 fatal 0 non-fatal 0 corrected
    ecap 000b[1d0] = Vendor [1] ID 0003 Rev 1 Length 10
    ecap 0019[250] = PCIe Sec 1 lane errors 0
    ecap 000b[280] = Vendor [1] ID 0005 Rev 3 Length 24
    ecap 000b[300] = Vendor [1] ID 0008 Rev 0 Length 56

Is this helpful:

# pciconf -br pcib10@pci65526:0:2:0 0x14:0x1f
00 00 00 00 00 01 01 00  f0 00 00 00

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