“/sys/bus/pci/rescan” is not finding devices connected to a bridge.
We have a server running CentOS 7.0 and a custom PCIe card with 2 PCIe
extender cables going to a custom board with 3 PCIe devices. This board has
a separate power supply. (All examples show a single extender being used.)
If we power the board on first, then the server, the devices are all
discovered. Here is what “lspci -tv” shows:
| \-13.6 Intel Corporation Xeon E5/Core i7 Ring to QuickPath
Interconnect Link 1 Performance Monitor
\-[0000:00]-+-00.0 Intel Corporation Xeon E5/Core i7 DMI2
+-01.0-[01]--
+-01.1-[02]--+-00.0 NVIDIA Corporation GT218 [ION]
| \-00.1 NVIDIA Corporation High Definition Audio
Controller
+-02.0-[03-0b]----00.0-[04-0b]--+-08.0-[05-0a]----00.0-[06-0a]-
-+-04.0-[07]----00.0 Xilinx Corporation Device 064c
| |
+-05.0-[08]----00.0 Xilinx Corporation Device 064c
| |
+-06.0-[09]----00.0 Xilinx Corporation Device 064c
| |
\-07.0-[0a]----00.0 Xilinx Corporation Device 064c
| \-10.0-[0b]--
+-03.0-[0c]--
If we power the server on first, then the board , neither the devices are
not discovered. Here is what “lspci -tv” shows:
| \-13.6 Intel Corporation Xeon E5/Core i7 Ring to QuickPath
Interconnect Link 1 Performance Monitor
\-[0000:00]-+-00.0 Intel Corporation Xeon E5/Core i7 DMI2
+-01.0-[01]--
+-01.1-[02]--+-00.0 NVIDIA Corporation GT218 [ION]
| \-00.1 NVIDIA Corporation High Definition Audio
Controller
+-02.0-[03-06]----00.0-[04-06]--+-08.0-[05]--
| \-10.0-[06]--
+-03.0-[07]--
After running “echo 1 > /sys/bus/pci/rescan” the downstream end of the PCIe
extender is found, but none of the devices connected to it.
| \-13.6 Intel Corporation Xeon E5/Core i7 Ring to QuickPath
Interconnect Link 1 Performance Monitor
\-[0000:00]-+-00.0 Intel Corporation Xeon E5/Core i7 DMI2
+-01.0-[01]--
+-01.1-[02]--+-00.0 NVIDIA Corporation GT218 [ION]
| \-00.1 NVIDIA Corporation High Definition Audio
Controller
+-02.0-[03-06]----00.0-[04-06]--+-08.0-[05]----00.0-[00]--
| \-10.0-[06]--
+-03.0-[07]--
The “rescan” does produce some interesting dmesg output:
[ 334.085754] pci 0000:05:00.0: [10b5:8632] type 01 class 0x060400
[ 334.085777] pci 0000:05:00.0: reg 0x10: [mem 0x00000000-0x0001ffff]
[ 334.085978] pci 0000:05:00.0: PME# supported from D0 D3hot D3cold
[ 334.087880] pci 0000:05:00.0: bridge configuration invalid ([bus 00-00]),
reconfiguring
[ 334.087898] pci 0000:05:00.0: can't allocate child bus 05 from [bus 05]
[ 334.088210] pcieport 0000:03:00.0: BAR 14: can't assign mem (size
0x100000)
[ 334.088217] pcieport 0000:04:08.0: BAR 14: can't assign mem (size
0x100000)
[ 334.088221] pci 0000:05:00.0: BAR 0: can't assign mem (size 0x20000)
[ 334.088227] pci 0000:00:1e.0: PCI bridge to [bus 0d]
[ 334.088287] pcieport 0000:05:00.0: device [10b5:8632] has invalid IRQ;
check vendor BIOS
[ 334.088428] pcieport 0000:05:00.0: irq 110 for MSI/MSI-X
I have tried the “remove” command at various PCI levels, like “echo 1 >
/sys/bus/pci/devices/0000\:00\:02.0/remove”. without any improvement.
Is there something else I can do to discover hot-plug PCI devices?
thanks,
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