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topology/sysfs: Add PPIN in sysfs under cpu topology

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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
This commit is contained in:
Tony Luck 2022-01-31 15:01:11 -08:00 committed by Borislav Petkov
parent 182ecfaf75
commit ab28e94419
5 changed files with 18 additions and 0 deletions
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4
Documentation/ABI/stable/sysfs-devices-system-cpu
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@ -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.

6
Documentation/ABI/testing/sysfs-devices-system-cpu
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@ -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.

1
arch/x86/include/asm/topology.h
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@ -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;

4
drivers/base/topology.c
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@ -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
};

3
include/linux/topology.h
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@ -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