linux-kernel - Re: [PATCH] PCI: create device, function symlinks in /sys/bus/pci/slots/N/

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Date:	Mon, 18 Aug 2008 15:03:40 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alex Chiang <achiang@...com>, jbarnes@...tuousgeek.org,
	matthew@....cx, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: create device, function symlinks in	/sys/bus/pci/slots/N/

Alex Chiang wrote:
> Create convenience symlinks in sysfs, linking slots to devices
> and functions, and vice versa. These links make it easier for
> users to figure out which devices actually live in what slots.
> 
> The device symlink points to the device's first function.
> 
> For example:
> 
> sapphire:/sys/bus/pci/slots # ls
> 1  10  2  3  4  5  6  7  8  9
> 
> sapphire:/sys/bus/pci/slots # ls -l 3
> total 0
> -r--r--r-- 1 root root 65536 Aug 18 14:10 address
> lrwxrwxrwx 1 root root     0 Aug 18 14:10 device -> ../../../../devices/pci0000:23/0000:23:01.0
> lrwxrwxrwx 1 root root     0 Aug 18 14:10 function0 -> ../../../../devices/pci0000:23/0000:23:01.0
> lrwxrwxrwx 1 root root     0 Aug 18 14:10 function1 -> ../../../../devices/pci0000:23/0000:23:01.1
> 

What's the point with "device" and "function0"?  They appear to be the 
same thing by definition.

	-hpa
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