Re: [Qemu-devel] Multiple pci buses

["Andreas Färber" <afaerber@suse.de>]

Am 17.03.2014 23:14, schrieb BALATON Zoltan:
> On Mon, 17 Mar 2014, Andreas Färber wrote:
>> In earlier times QEMU did not properly support multiple PCI bus domains.
>> Some code in
>> http://git.qemu.org/?p=qemu.git;a=blob;f=hw/pci-host/uninorth.c;h=e72fe2a70b954bf5675ad0c8735fea6bad665be6;hb=HEAD
>>
>> is #if 0'ed out that you should take a look at.
> 
> I've seen these #if 0'ed parts but just enabling them does not seem to
> be enough. I don't know enough about how should all this work and found
> no documentation or examples to follow so I hope someone can explain
> what it takes to create two pci buses (so devices added to the first get
> 0:dev:func and those added to the second get 1:dev:func addresses) and
> these busses have their Cfg/IO/MMIO space mapped to different addresses.
> The patch I came up with so far did not work. The pci buses and memory
> map from the dumps I've seen should look like this:
> 
> 0000:00:0b.0 Host bridge [0600]: Apple Computer Inc. UniNorth AGP
> [106b:0020]
> 0000:00:10.0 VGA compatible controller [0300]: ATI Technologies Inc
> Radeon R200 QL [Radeon 8500 LE] [1002:514c]
> 
> 0001:10:0b.0 Host bridge [0600]: Apple Computer Inc. UniNorth PCI
> [106b:001f]
> 0001:10:0d.0 PCI bridge [0604]: Digital Equipment Corporation DECchip
> 21154 [1011:0026] (rev 05)
> 0001:11:07.0 Unassigned class [ff00]: Apple Computer Inc. KeyLargo Mac
> I/O [106b:0022] (rev 02)
> 
> corresponding to this openfirmware tree:
> 
> ff8721c0: /pci@f0000000
> ff898cd0:   /uni-north-agp@b
> ff898f40:   /ATY,Rage128Ps@10
> ff873268: /pci@f2000000
> ff8742d8:   /pci-bridge@d
> ff876368:     /mac-io@7
> 
> and the memory mapping is:
> 
> 80000000-8fffffff : /pci@f2000000
>    80000000-800fffff : PCI Bus 0001:11
>      80000000-8007ffff : 0001:11:07.0
>        80000000-8007ffff : 0.80000000:mac-io
> 
> 90000000-9fffffff : /pci@f0000000
>    90000000-9000ffff : 0000:00:10.0
>      90000000-9000ffff : radeonfb mmio
> 
> f1000000-f1ffffff : /pci@f0000000
> f3000000-f3ffffff : /pci@f2000000
> 
>> I had investigated that some time ago based on a G4 in our office and
>> might be able to revive some patches... Please keep me CC'ed.
> 
> If you have any info/patches for this they are very welcome.

Just stumbled over a text file of our G4:

--->8---

0000:00:0b.0 Apple Computer Inc. UniNorth AGP [106b:0020]

0001:10:0b.0 Apple Computer Inc. UniNorth PCI [106b:001f]
0001:10:0d.0 Digital Equipment Corporation DECchip 21154 [1011:0026]

0002:21:0b.0 Apple Computer Inc. UniNorth Internal PCI [106b:001e]

--->8---

The first three match yours, but I have an additional internal PCI.

Cheers,
Andreas

P.S. Forgot to mention, do not add #if 0s in patches. Either keep code
compiling or drop it properly. Otherwise it will bit-rot.

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