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Re: [Qemu-devel] USB PCI host bus adapter hot plug
From: |
Alexey Kardashevskiy |
Subject: |
Re: [Qemu-devel] USB PCI host bus adapter hot plug |
Date: |
Tue, 12 Aug 2014 16:05:25 +1000 |
User-agent: |
Mozilla/5.0 (X11; Linux i686 on x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0 |
On 08/11/2014 03:59 PM, Gonglei (Arei) wrote:
> Hi,
>
>> Subject: [Qemu-devel] USB PCI host bus adapter hot plug
>>
>> Hi!
>>
>> I noticed that QMP's "device_add usb-ehci,id=i2,bus=pci.0" fails on PCI
>> hotplug. The same for pci-ohci and this is because their initfn() do
>> "dc->hotpluggable = false". So I removed those and now I can hotplug USB
>> hosts but none of them is able to actually work:
>>
>> address@hidden:~# echo 1 >/sys/bus/pci/rescan
>> [ 41.143062] ohci-pci 0000:00:01.0: init err (c8700000 0000)
>> [ 41.143133] ohci-pci 0000:00:01.0: can't start
>> [ 41.143227] ohci-pci 0000:00:01.0: startup error -75
>> [ 41.144202] ohci-pci 0000:00:01.0: init 0000:00:01.0 fail, -75
>>
>>
>> address@hidden:~# echo 1 >/sys/bus/pci/rescan
>> [ 43.691067] ehci-pci 0000:00:01.0: can't setup: -110
>> [ 43.692424] ehci-pci 0000:00:01.0: init 0000:00:01.0 fail, -110
>>
>>
>> Why is that? Is QEMU just missing some bits or there is some fundamental
>> issue which I just do not see? Thanks!
>>
> Cc'ing Gerd.
>
> Actually I have post a patch serials for supporting usb host adapter
> hotplugging,
> Which has been involved in Gerd's (the USB mantainer) usb-next tree. Please
> see:
> https://www.kraxel.org/cgit/qemu/log/?h=rebase/usb-next
>
> The function of usb host adapter hotplugging is ok. You are welcome to test
> it.
It does not work for me though. The device appears in the system but the
driver fails to bring it up:
address@hidden ~]# echo 1 >/sys/bus/pci/rescan
[ 43.482378] pci 0000:00:01.0: BAR 0: assigned [mem
0x100a0000000-0x100a0000fff]
[ 43.488851] ehci-pci 0000:00:01.0: EHCI Host Controller
[ 43.490153] ehci-pci 0000:00:01.0: new USB bus registered, assigned bus
number 1
[ 43.504957] ehci-pci 0000:00:01.0: can't setup: -110
[ 43.505028] ehci-pci 0000:00:01.0: USB bus 1 deregistered
[ 43.507660] ehci-pci 0000:00:01.0: init 0000:00:01.0 fail, -110
[ 43.507808] ehci-pci: probe of 0000:00:01.0 failed with error -110
> BTW, What's your guest os type?
Fedora20/ppc64 or Ubuntu14/ppc64le.
I tried your tree merged with
https://github.com/mdroth/qemu/tree/spapr-pci-hotplug-ppc-next-cleanup2
I am adding PCIhotplug-on-PPC experts to the thread, may be they have ideas...
--
Alexey