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 /arch/x86/include/asm/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 'arch/x86/include/asm/topology.h')
| -rw-r--r-- | arch/x86/include/asm/topology.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h index 2f0b6be8eaab..43a89476a522 100644 --- a/arch/x86/include/asm/topology.h +++ b/arch/x86/include/asm/topology.h @@ -110,6 +110,7 @@ extern const struct cpumask *cpu_clustergroup_mask(int cpu); #define topology_logical_die_id(cpu) (cpu_data(cpu).logical_die_id) #define topology_die_id(cpu) (cpu_data(cpu).cpu_die_id) #define topology_core_id(cpu) (cpu_data(cpu).cpu_core_id) +#define topology_ppin(cpu) (cpu_data(cpu).ppin) extern unsigned int __max_die_per_package; |