[Qemu-devel] [Question] PCI-to-PCI bridge

[Qemu-devel] [Question] PCI-to-PCI bridge

[Wen Congyang]

Hi, all

We'd like to add PCI-to-PCI Bridge for qemu(kvm) for x86/x86_64 box.
I read the code, and find the following hardware calls the function
pci_bridge_initfn():
1. apb
2. ioh3420
3. xio3130

ioh3420 and xio3130 is for PCIe, and apb is for sparc box.
I do not find any PCI-to-PCI bridge for x86/x86_64 box.
Is there some projects we can join ? If not, we'll start
from scratch and add a new one.

Thanks
Wen Congyang

Re: [Qemu-devel] [Question] PCI-to-PCI bridge

[Gerd Hoffmann]

On 08/16/11 04:22, Wen Congyang wrote:
> Hi, all
>
> We'd like to add PCI-to-PCI Bridge for qemu(kvm) for x86/x86_64 box.
> I read the code, and find the following hardware calls the function
> pci_bridge_initfn():
> 1. apb
> 2. ioh3420
> 3. xio3130
>
> ioh3420 and xio3130 is for PCIe, and apb is for sparc box.
> I do not find any PCI-to-PCI bridge for x86/x86_64 box.
> Is there some projects we can join ? If not, we'll start

There is one in hw/dec_pci.c.  This isn't compiled by default, but that 
is just a configuration issue.  I had some IRQ routing issues with that 
one though.

There is also http://patchwork.ozlabs.org/patch/103058/ which works fine 
after fixing the double irq_num.  Michael wants implement hotplug 
support before merging it though.

cheers,
   Gerd

Re: [Qemu-devel] [Question] PCI-to-PCI bridge

[Wen Congyang]

At 08/16/2011 09:40 PM, Gerd Hoffmann Write:
> On 08/16/11 04:22, Wen Congyang wrote:
>> Hi, all
>>
>> We'd like to add PCI-to-PCI Bridge for qemu(kvm) for x86/x86_64 box.
>> I read the code, and find the following hardware calls the function
>> pci_bridge_initfn():
>> 1. apb
>> 2. ioh3420
>> 3. xio3130
>>
>> ioh3420 and xio3130 is for PCIe, and apb is for sparc box.
>> I do not find any PCI-to-PCI bridge for x86/x86_64 box.
>> Is there some projects we can join ? If not, we'll start
> 
> There is one in hw/dec_pci.c.  This isn't compiled by default, but that
> is just a configuration issue.  I had some IRQ routing issues with that
> one though.

Yes, I found this device. Do you mean there are some IRQ problems about this
device?

> 
> There is also http://patchwork.ozlabs.org/patch/103058/ which works fine
> after fixing the double irq_num.  Michael wants implement hotplug
> support before merging it though.
> 
> cheers,
>   Gerd
> 
> 

Re: [Qemu-devel] [Question] PCI-to-PCI bridge

[Gerd Hoffmann]

On 08/17/11 04:41, Wen Congyang wrote:
> At 08/16/2011 09:40 PM, Gerd Hoffmann Write:
>> There is one in hw/dec_pci.c.  This isn't compiled by default, but that
>> is just a configuration issue.  I had some IRQ routing issues with that
>> one though.
>
> Yes, I found this device. Do you mean there are some IRQ problems about this
> device?

I think so, I'm not fully sure though.  Just did a quick test and 
figured devices behind the bridge where not working correctly.  I think 
some IRQ bug is the most likely cause, but I didn't investigate in detail.

cheers,
   Gerd