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| author | Ian Munsie <imunsie@au1.ibm.com> | 2015-02-04 11:09:01 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-02-06 03:16:56 +0300 |
| commit | b087e6190ddcd9ae4e8ff2c788d2b32f193e946b (patch) | |
| tree | f62802d81710bb9a4c9c8b15ceb5fe4498828383 /Documentation/ABI/testing/sysfs-class-cxl | |
| parent | c2c896bee08e1461fc24f9bf7dd57e2c63f6db70 (diff) | |
| download | linux-b087e6190ddcd9ae4e8ff2c788d2b32f193e946b.tar.xz | |
cxl: Export optional AFU configuration record in sysfs
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>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-cxl')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-cxl | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-cxl b/Documentation/ABI/testing/sysfs-class-cxl index 9ea01068a16c..3680364b4048 100644 --- a/Documentation/ABI/testing/sysfs-class-cxl +++ b/Documentation/ABI/testing/sysfs-class-cxl @@ -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 |