Re: [PATCH] pcictl: simplify its usage

[Michael <macallan%netbsd.org@localhost>]

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Hello,

On Jun 4, 2009, at 2:54 PM, Joerg Sonnenberger wrote:

> On Thu, Jun 04, 2009 at 07:18:50PM +0200, Matthias Drochner wrote:
> > This might be not a big issue with a simple PC, but on
> > a big box with multiple PCI hierarchies the same physical bus
> > number can occur multiple times.
>
> One typical example is a system with multiple PCI domains, which we
> currently don't really support though, I think.

Most halfway recent PowerMacs have multiple PCI domains:

/home/ml/Music# pcictl pci0 list
000:11:0: Apple Computer UniNorth AGP Interface (host bridge)
000:16:0: ATI Technologies Rage Fury MAXX AGP 4x (TMDS) (VGA display)
/home/ml/Music# pcictl pci1 list
000:11:0: Apple Computer UniNorth Host-PCI Bridge (host bridge)
000:13:0: Digital Equipment DC21154 PCI-PCI Bridge (PCI bridge,  
revision 0x05)
/home/ml/Music# pcictl pci2 list
001:02:0: Schneider & Koch SK-NET SK-9DX1 Gigabit Ethernet (ethernet  
network, revision 0x11)
001:07:0: Apple Computer KeyLargo I/O Controller (undefined subclass  
0x00, revision 0x03)
001:08:0: Apple Computer KeyLargo USB Controller (USB serial bus,  
interface 0x10)
001:09:0: Apple Computer KeyLargo USB Controller (USB serial bus,  
interface 0x10)
001:10:0: Texas Instruments TSB12LV26 IEEE 1394 Host Controller  
(Firewire serial bus, interface 0x10)
/home/ml/Music# pcictl pci3 list
000:11:0: Apple Computer UniNorth Host-PCI Bridge (host bridge)
000:15:0: Apple Computer GMAC Ethernet (ethernet network, revision 0x01)

So, I have three PCI buses with bus number 0. The machine is a Gigabit  
Ethernet G4 - all UniNorth-based machines ( that is, all G4s and newer  
G3s ) will have a similar bus layout and even some older machines like  
the 9600 have two host bridges. Same with sparc64 - we support quite a  
few machines with more than one psycho, only Sun's OF assigns the root  
buses different IDs, usually 0 and 128.
Works fine, my only gripe is that there is no sane & reliable way for  
userland to find out if /dev/pci<a> is a subordinate of /dev/pci<b>.

have fun
Michael

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