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| author | Tony Luck <tony.luck@intel.com> | 2022-01-31 15:01:11 -0800 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2022-02-01 16:36:42 +0100 |
| commit | ab28e944197fa78e6af7c4a0ffd6bba9a5bbacf0 (patch) | |
| tree | eab1e7b2ff51bb94601b9f82e7b37a3c54508db8 /Documentation/ABI/testing/sysfs-devices-system-cpu | |
| parent | 182ecfaf757de234a5262f51c0e699bec7258a67 (diff) | |
| download | linux-ab28e944197fa78e6af7c4a0ffd6bba9a5bbacf0.tar.gz linux-ab28e944197fa78e6af7c4a0ffd6bba9a5bbacf0.tar.bz2 linux-ab28e944197fa78e6af7c4a0ffd6bba9a5bbacf0.zip | |
topology/sysfs: Add PPIN in sysfs under cpu topology
PPIN is the Protected Processor Identification Number.
This is used to identify the socket as a Field Replaceable Unit (FRU).
Existing code only displays this when reporting errors. But this makes
it inconvenient for large clusters to use it for its intended purpose
of inventory control.
Add ppin to /sys/devices/system/cpu/cpu*/topology to make what
is already available using RDMSR more easily accessible. Make
the file read only for root in case there are still people
concerned about making a unique system "serial number" available.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20220131230111.2004669-6-tony.luck@intel.com
Diffstat (limited to 'Documentation/ABI/testing/sysfs-devices-system-cpu')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-system-cpu | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index 61f5676a7429..74962c200790 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -73,6 +73,7 @@ What: /sys/devices/system/cpu/cpuX/topology/core_id /sys/devices/system/cpu/cpuX/topology/physical_package_id /sys/devices/system/cpu/cpuX/topology/thread_siblings /sys/devices/system/cpu/cpuX/topology/thread_siblings_list + /sys/devices/system/cpu/cpuX/topology/ppin Date: December 2008 Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> Description: CPU topology files that describe a logical CPU's relationship @@ -103,6 +104,11 @@ Description: CPU topology files that describe a logical CPU's relationship thread_siblings_list: human-readable list of cpuX's hardware threads within the same core as cpuX + ppin: human-readable Protected Processor Identification + Number of the socket the cpu# belongs to. There should be + one per physical_package_id. File is readable only to + admin. + See Documentation/admin-guide/cputopology.rst for more information. |