https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236922
--- Comment #9 from Tommy P <tommy...@gmail.com> ---
(In reply to Bryan Venteicher from comment #8)
Hi Bryan,
Thank you for the feedback. I've been digging further to learn more about the
FreeBSD's internal while improving my C/C++ skills. I've found that there are
2 sets of device IDs: PCI (which FreeBSD currently support) and the PCIe
(which I think your work would support). I'll give them a try a report back if
I've found any issue.
While doing a lot of trial and error, I've found something puzzling. If I
build my custom kernel w/o debug, traces, and netmap (in addition to
unnecessary drivers), pciconf shows correctly for the PCIe root:
pcib1@pci0:0:2:0: class=0x060400 card=0x00001b36 chip=0x000c1b36 rev=0x00
hdr=0x01
vendor = 'Red Hat, Inc.'
device = 'QEMU PCIe Root port'
class = bridge
subclass = PCI-PCI
cap 10[54] = PCI-Express 2 root port max data 128(128) ARI disabled
link x1(x1) speed 2.5(2.5) ASPM disabled(L0s)
slot 0 power limit 0 mW HotPlug(present) surprise Attn Button
PC(on) EI(disengaged)
cap 11[48] = MSI-X supports 1 message
Table in map 0x10[0x0], PBA in map 0x10[0x800]
cap 0d[40] = PCI Bridge card=0x00001b36
ecap 0001[100] = AER 2 0 fatal 0 non-fatal 0 corrected
However, when added back in the debug, traces, and netmap (still w/o the extra
drivers) similar to the GENERIC kernel, that same controller becomes:
none0@pci0:0:2:0: class=0x060400 card=0x00001b36 chip=0x000c1b36 rev=0x00
hdr=0x01
vendor = 'Red Hat, Inc.'
device = 'QEMU PCIe Root port'
class = bridge
subclass = PCI-PCI
bar [10] = type Memory, range 32, base 0xfd212000, size 4096, enabled
bus range = 1-1
window[1c] = type I/O Port, range 16, addr 0xe000-0xdfff, disabled
window[20] = type Memory, range 32, addr 0xfd000000-0xfd1fffff, enabled
window[24] = type Prefetchable Memory, range 64, addr
0xfea00000-0xfebfffff, enabled
cap 10[54] = PCI-Express 2 root port max data 128(128) ARI disabled
link x1(x1) speed 2.5(2.5) ASPM disabled(L0s)
slot 0 power limit 0 mW HotPlug(present) surprise Attn Button
PC(on) EI(disengaged)
cap 11[48] = MSI-X supports 1 message
Table in map 0x10[0x0], PBA in map 0x10[0x800]
cap 0d[40] = PCI Bridge card=0x00001b36
ecap 0001[100] = AER 2 0 fatal 0 non-fatal 0 corrected
as seen from pciconf. Note how it's 'pcib1' w/o debug+traces and 'none0' with
debug+traces. I don't know if the bug is with the VirtIO driver or the
debug/trace. Perhaps its by design? This from src r345840.
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