* A question about PCI device rescan
@ 2014-10-09 10:50 Wei, Aaron
2014-10-10 1:38 ` Yijing Wang
0 siblings, 1 reply; 3+ messages in thread
From: Wei, Aaron @ 2014-10-09 10:50 UTC (permalink / raw)
To: linux-pci@vger.kernel.org
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?
Thanks,
Aaron
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: A question about PCI device rescan
2014-10-09 10:50 A question about PCI device rescan Wei, Aaron
@ 2014-10-10 1:38 ` Yijing Wang
2014-10-10 2:38 ` Wei, Aaron
0 siblings, 1 reply; 3+ messages in thread
From: Yijing Wang @ 2014-10-10 1:38 UTC (permalink / raw)
To: Wei, Aaron, linux-pci@vger.kernel.org
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
^ permalink raw reply [flat|nested] 3+ messages in thread* RE: A question about PCI device rescan
2014-10-10 1:38 ` Yijing Wang
@ 2014-10-10 2:38 ` Wei, Aaron
0 siblings, 0 replies; 3+ messages in thread
From: Wei, Aaron @ 2014-10-10 2:38 UTC (permalink / raw)
To: Yijing Wang, linux-pci@vger.kernel.org
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2014-10-09 10:50 A question about PCI device rescan Wei, Aaron
2014-10-10 1:38 ` Yijing Wang
2014-10-10 2:38 ` Wei, Aaron
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