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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 /drivers/base/topology.c | |
| parent | 182ecfaf757de234a5262f51c0e699bec7258a67 (diff) | |
| download | linux-ab28e944197fa78e6af7c4a0ffd6bba9a5bbacf0.tar.bz2 | |
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 'drivers/base/topology.c')
| -rw-r--r-- | drivers/base/topology.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/base/topology.c b/drivers/base/topology.c index 044f3664f8f2..e9d1efcda89b 100644 --- a/drivers/base/topology.c +++ b/drivers/base/topology.c @@ -58,6 +58,9 @@ static DEVICE_ATTR_RO(cluster_id); define_id_show_func(core_id, "%d"); static DEVICE_ATTR_RO(core_id); +define_id_show_func(ppin, "0x%llx"); +static DEVICE_ATTR_ADMIN_RO(ppin); + define_siblings_read_func(thread_siblings, sibling_cpumask); static BIN_ATTR_RO(thread_siblings, 0); static BIN_ATTR_RO(thread_siblings_list, 0); @@ -145,6 +148,7 @@ static struct attribute *default_attrs[] = { #ifdef TOPOLOGY_DRAWER_SYSFS &dev_attr_drawer_id.attr, #endif + &dev_attr_ppin.attr, NULL }; |