Re: PCI rescan issue

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On 2014/6/19 9:33, Jon Baker wrote:
I am trying to find a solution to a Linux PCI rescan problem.

I have CentOS 6.5

    [jbaker@server0 ~]$ uname -a
Linux server0 2.6.32-431.5.1.el6.x86_64 #1 SMP Wed Feb 12 00:41:43 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

I have an Altera FPGA PCIe protoboard I am trying to test in a TYAN FT77A-B7059.

We are trying to solve some hotplug/FPGA reload issues; when we reload the FPGA the PCI interface reloads confusing linux pci code.

After bootup the board is seen by the kernel; lscpi shows Altera FPGA PCIe protoboard settings and config space. We can load our driver and all is well.

When we reload the FPGA lscpi display shows all "ff" for config space.  As

Are you saying all values in the config space are 0xff? If yes, this mean the vendor/device ids are invalid, so I'm just curious how OS identify this device, and you really can see that with lspci?

Tiejun

root I tried

    echo 1 > /sys/bus/pci/rescan

But no change to lspci output.

I tried some variants

    echo 1 > /sys/bus/pci/devices/0000:8a:00.0/rescan

no change to lspci output.

    echo 1 > /sys/bus/pci/devices/0000:8a:00.0/remove
    echo 1 > /sys/bus/pci/rescan

This removed the device and it did not show up again in lscpi.

Kernel has PCI HOTPLUG enabled:

[jbaker@server0 ~]$ cat /boot/config-2.6.32-431.el6.x86_64 | grep HOTPLUG
    CONFIG_HOTPLUG=y
    CONFIG_MEMORY_HOTPLUG=y
    CONFIG_MEMORY_HOTPLUG_SPARSE=y
    CONFIG_HOTPLUG_CPU=y
    CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
    CONFIG_ACPI_HOTPLUG_CPU=y
    CONFIG_ACPI_HOTPLUG_MEMORY=y
    CONFIG_ACPI_HOTPLUG_MEMORY_AUTO_ONLINE=y
    CONFIG_HOTPLUG_PCI_PCIE=y
    CONFIG_HOTPLUG_PCI=y
    CONFIG_HOTPLUG_PCI_FAKE=m
    CONFIG_HOTPLUG_PCI_ACPI=y
    CONFIG_HOTPLUG_PCI_ACPI_IBM=m
    # CONFIG_HOTPLUG_PCI_CPCI is not set
    CONFIG_HOTPLUG_PCI_SHPC=m
    [jbaker@server0 ~]$

The kernel has pciehp module loaded, I see pciehp messages in /var/log/messages.

In other distros, on other platforms, echo 1 > /sys/bus/pci/rescan has worked but does not appear to work here for CentOS 6.5 on this hardware.

This problem is much discussed on the web but I have yet to see a solution discussed. I am thinking the 2.6.32-431.5.1.el6.x86_64 kernel may require a patch(es). The rescan may not be resetting the PCIe card?

Any ideas how to get rescan to work?

Thank you,

Jon Baker


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