diff options
| 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 /include/linux/topology.h | |
| parent | 182ecfaf757de234a5262f51c0e699bec7258a67 (diff) | |
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 'include/linux/topology.h')
| -rw-r--r-- | include/linux/topology.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/topology.h b/include/linux/topology.h index a6e201758ae9..f19bc3626297 100644 --- a/include/linux/topology.h +++ b/include/linux/topology.h @@ -211,6 +211,9 @@ static inline int cpu_to_mem(int cpu) #ifndef topology_drawer_id #define topology_drawer_id(cpu) ((void)(cpu), -1) #endif +#ifndef topology_ppin +#define topology_ppin(cpu) ((void)(cpu), 0ull) +#endif #ifndef topology_sibling_cpumask #define topology_sibling_cpumask(cpu) cpumask_of(cpu) #endif |