On 2014/10/9 18:50, Wei, Aaron wrote:
> Hi,
>
> Could someone help explain why writing to "rescan" under "/sys/bus/pci/devices/.../rescan" will force a rescan of the device's parent bus instead of just re-discover all the devices behind this device (if the device is type-0, then nothing happens).
>
> Is there any user space interface that could let user just rescan devices behind one specified type-1 device?
You can use pci_bus rescan which is placed under the pci_bus, i.e.
\-[0000:00]-+-00.0 Intel Corporation 5520/5500/X58 I/O Hub to ESI Port
+-01.0-[0000:01-02]--+-00.0 Intel Corporation 82576 Gigabit Network Connection
| \-00.1 Intel Corporation 82576 Gigabit Network Connection
If you want to rescan devices behind 00:01.0(root port),
echo 1 > /sys/bus/pci/devices/0000:00:01.0/pci_bus/0000:01/rescan
Then it will only rescan the subordinate pci bus.
>
> Thanks,
> Aaron
>
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--
Thanks!
Yijing
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