linux-kernel - PCI(e) enumeration

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Date:	Thu, 15 Dec 2011 10:41:14 +0100
From:	Christian Gmeiner <christian.gmeiner@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: PCI(e) enumeration

Hi all,

I maintain a debian based linux RFS in my company and my college does the
same for windows. Now we run into a problem that windows and linux use a
different network interface as eth0. In our target system there
are two identical NICs installed.

So I am now looking to find out, how linux does the PCI enumeration
and in which order
the PCI driver gets called to do the initialization. Can somebody tell
me if a depth-first search
or a breadth-first search is done on the PCI bus.


For instance look at this lspci output:

00:01.0 Host bridge: Advanced Micro Devices [AMD] CS5536 [Geode
companion] Host Bridge (rev 33)
00:01.1 VGA compatible controller: Advanced Micro Devices [AMD] Geode LX Video
00:01.2 Entertainment encryption device: Advanced Micro Devices [AMD]
Geode LX AES Security Block
00:04.0 Ethernet controller: Intel Corporation 8255xER/82551IT Fast
Ethernet Controller (rev 10)
00:0f.0 ISA bridge: Advanced Micro Devices [AMD] CS5536 [Geode
companion] ISA (rev 03)
00:0f.2 IDE interface: Advanced Micro Devices [AMD] CS5536 [Geode
companion] IDE (rev 01)
00:0f.3 Multimedia audio controller: Advanced Micro Devices [AMD]
CS5536 [Geode companion] Audio (rev 01)
00:0f.4 USB Controller: Advanced Micro Devices [AMD] CS5536 [Geode
companion] OHC (rev 02)
00:0f.5 USB Controller: Advanced Micro Devices [AMD] CS5536 [Geode
companion] EHC (rev 02)
00:0f.7 USB Controller: Advanced Micro Devices [AMD] CS5536 [Geode
companion] UOC (rev 02)

How will linux does the enumeration?

thanks
--
Christian Gmeiner, MSc
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