xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

PCI: create function symlinks in /sys/bus/pci/slots/N/

Browse Source 
Create convenience symlinks in sysfs, linking slots to device
functions, and vice versa. These links make it easier for users to
figure out which devices actually live in what slots.

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 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/function0/slot
lrwxrwxrwx 1 root root 0 Aug 18 14:13 3/function0/slot ->
../../../bus/pci/slots/3

The original form of this patch was written by Matthew Wilcox,
and was enhanced to include links from the sysfs slots/ directory
pointing back at the device functions.

Cc: willy@linux.intel.com
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Alex Chiang
2010-03-08 10:24:29 -07:00
committed by Jesse Barnes
parent fc2a093e7a
commit 75568f8094
3 changed files with 125 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
Documentation/ABI/testing/sysfs-bus-pci
View File

@@ -133,6 +133,46 @@ Description:
The symbolic link points to the PCI device sysfs entry of the
Physical Function this device associates with.
What: /sys/bus/pci/slots/...
Date: April 2005 (possibly older)
KernelVersion: 2.6.12 (possibly older)
Contact: linux-pci@vger.kernel.org
Description:
When the appropriate driver is loaded, it will create a
directory per claimed physical PCI slot in
/sys/bus/pci/slots/. The names of these directories are
specific to the driver, which in turn, are specific to the
platform, but in general, should match the label on the
machine's physical chassis.
The drivers that can create slot directories include the
PCI hotplug drivers, and as of 2.6.27, the pci_slot driver.
The slot directories contain, at a minimum, a file named
'address' which contains the PCI bus:device:function tuple.
Other files may appear as well, but are specific to the
driver.
What: /sys/bus/pci/slots/.../function[0-7]
Date: March 2010
KernelVersion: 2.6.35
Contact: linux-pci@vger.kernel.org
Description:
If PCI slot directories (as described above) are created,
and the physical slot is actually populated with a device,
symbolic links in the slot directory pointing to the
device's PCI functions are created as well.
What: /sys/bus/pci/devices/.../slot
Date: March 2010
KernelVersion: 2.6.35
Contact: linux-pci@vger.kernel.org
Description:
If PCI slot directories (as described above) are created,
a symbolic link pointing to the slot directory will be
created as well.
What: /sys/bus/pci/slots/.../module
Date: June 2009
Contact: linux-pci@vger.kernel.org