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

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Message-ID: <20080818204601.GA14374@kroah.com>
Date:	Mon, 18 Aug 2008 13:46:01 -0700
From:	Greg KH <greg@...ah.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/

On Mon, Aug 18, 2008 at 02:21:00PM -0600, 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
> 
> sapphire:/sys/bus/pci/slots # ls -l 3/device/slot
> lrwxrwxrwx 1 root root 0 Aug 18 14:13 3/device/slot -> ../../../bus/pci/slots/3
> 
> The original form of this patch was written by Matthew Wilcox,
> but did not have links from the sysfs slots/ directory pointing
> back at devices and functions.

As you are adding new sysfs files/symlinks, please document them in
Documentation/ABI.

thanks,

greg k-h
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