git/linux-net
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/ synced 2026-04-18 06:33:43 -04:00
Code Issues Packages Projects Releases Wiki Activity

cxl: Export optional AFU configuration record in sysfs

Browse Source 
An AFU may optionally contain one or more PCIe like configuration
records, which can be used to identify the AFU.

This patch adds support for exposing the raw config space and the
vendor, device and class code under sysfs. These will appear in a
subdirectory of the AFU device corresponding with the configuration
record number, e.g.

cat /sys/class/cxl/afu0.0/cr0/vendor
0x1014

cat /sys/class/cxl/afu0.0/cr0/device
0x4350

cat /sys/class/cxl/afu0.0/cr0/class
0x120000

hexdump -C /sys/class/cxl/afu0.0/cr0/config
00000000  14 10 50 43 00 00 00 00  06 00 00 12 00 00 00 00  |..PC............|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000100

These files behave in much the same way as the equivalent files for PCI
devices, with one exception being that the config file is currently
read-only and restricted to the root user. It is not necessarily
required to be this strict, but we currently do not have a compelling
use-case to make it writable and/or world-readable, so I erred on the
side of being restrictive.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Ian Munsie
2015-02-04 19:09:01 +11:00
committed by Michael Ellerman
parent c2c896bee0
commit b087e6190d
4 changed files with 242 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
Documentation/ABI/testing/sysfs-class-cxl
View File

@@ -81,6 +81,43 @@ Description: read only
this this kernel supports.
AFU configuration records (eg. /sys/class/cxl/afu0.0/cr0):
An AFU may optionally export one or more PCIe like configuration records, known
as AFU configuration records, which will show up here (if present).
What: /sys/class/cxl/<afu>/cr<config num>/vendor
Date: February 2015
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Hexadecimal value of the vendor ID found in this AFU
configuration record.
What: /sys/class/cxl/<afu>/cr<config num>/device
Date: February 2015
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Hexadecimal value of the device ID found in this AFU
configuration record.
What: /sys/class/cxl/<afu>/cr<config num>/vendor
Date: February 2015
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
Hexadecimal value of the class code found in this AFU
configuration record.
What: /sys/class/cxl/<afu>/cr<config num>/config
Date: February 2015
Contact: linuxppc-dev@lists.ozlabs.org
Description: read only
This binary file provides raw access to the AFU configuration
record. The format is expected to match the either the standard
or extended configuration space defined by the PCIe
specification.
Master contexts (eg. /sys/class/cxl/afu0.0m)
What: /sys/class/cxl/<afu>m/mmio_size