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| author | Tony Luck <tony.luck@intel.com> | 2022-02-01 02:01:11 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2022-02-01 18:36:42 +0300 |
| commit | ab28e944197fa78e6af7c4a0ffd6bba9a5bbacf0 (patch) | |
| tree | eab1e7b2ff51bb94601b9f82e7b37a3c54508db8 /Documentation/ABI/stable | |
| parent | 182ecfaf757de234a5262f51c0e699bec7258a67 (diff) | |
| download | linux-ab28e944197fa78e6af7c4a0ffd6bba9a5bbacf0.tar.xz | |
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/stable')
| -rw-r--r-- | Documentation/ABI/stable/sysfs-devices-system-cpu | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-devices-system-cpu b/Documentation/ABI/stable/sysfs-devices-system-cpu index 3965ce504484..902392d7eddf 100644 --- a/Documentation/ABI/stable/sysfs-devices-system-cpu +++ b/Documentation/ABI/stable/sysfs-devices-system-cpu @@ -86,6 +86,10 @@ What: /sys/devices/system/cpu/cpuX/topology/die_cpus Description: internal kernel map of CPUs within the same die. Values: hexadecimal bitmask. +What: /sys/devices/system/cpu/cpuX/topology/ppin +Description: per-socket protected processor inventory number +Values: hexadecimal. + What: /sys/devices/system/cpu/cpuX/topology/die_cpus_list Description: human-readable list of CPUs within the same die. The format is like 0-3, 8-11, 14,17. |