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Tony Luck ab28e94419 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
2022-02-01 16:36:42 +01:00
..
firewire-cdev docs: ABI: cleanup several ABI documents 2020-10-30 13:14:29 +01:00
o2cb ABI: o2cb: add an obsolete file for /sys/o2cb 2021-09-28 12:48:15 +02:00
procfs-audit_loginuid audit: drop /proc/PID/loginuid documentation Format field 2021-04-01 18:32:24 -04:00
syscalls
sysfs-acpi-pmprofile docs: ABI: cleanup several ABI documents 2020-10-30 13:14:29 +01:00
sysfs-block docs: sysfs-block: document virt_boundary_mask 2022-01-09 18:59:10 -07:00
sysfs-bus-firewire docs: ABI: stable: make files ReST compatible 2020-10-30 13:07:01 +01:00
sysfs-bus-fsl-mc bus: fsl-mc: add autorescan sysfs 2021-01-27 15:13:53 +01:00
sysfs-bus-mhi bus: mhi: core: Introduce sysfs entries for MHI 2020-10-02 11:33:47 +02:00
sysfs-bus-nvmem docs: ABI: stable: make files ReST compatible 2020-10-30 13:07:01 +01:00
sysfs-bus-usb docs: ABI: stable: make files ReST compatible 2020-10-30 13:07:01 +01:00
sysfs-bus-vmbus docs: typo fixes in Documentation/ABI/ 2021-05-13 09:13:25 -06:00
sysfs-bus-w1 docs: ABI: cleanup several ABI documents 2020-10-30 13:14:29 +01:00
sysfs-bus-xen-backend docs: typo fixes in Documentation/ABI/ 2021-05-13 09:13:25 -06:00
sysfs-class-backlight docs: ABI: stable: make files ReST compatible 2020-10-30 13:07:01 +01:00
sysfs-class-infiniband ABI: sysfs-class-infiniband: use wildcards on What definitions 2021-09-21 18:31:16 +02:00
sysfs-class-rfkill docs: ABI: stable: make files ReST compatible 2020-10-30 13:07:01 +01:00
sysfs-class-tpm ABI: sysfs-class-tpm: use wildcards for pcr-* nodes 2021-09-21 18:31:15 +02:00
sysfs-class-ubi UBI: Add ro-mode sysfs attribute 2016-05-24 15:15:26 +02:00
sysfs-class-udc Documentation: ABI: sysfs-class-udc: remove duplicated entry 2017-06-13 13:21:04 +03:00
sysfs-devices ABI: sysfs-devices: add /dev ABI 2021-09-28 12:48:15 +02:00
sysfs-devices-node x86/sgx: Add an attribute for the amount of SGX memory in a NUMA node 2021-12-09 07:02:22 -08:00
sysfs-devices-system-cpu topology/sysfs: Add PPIN in sysfs under cpu topology 2022-02-01 16:36:42 +01:00
sysfs-devices-system-xen_memory xen/balloon: add runtime control for scrubbing ballooned out pages 2018-09-14 08:51:10 -04:00
sysfs-driver-aspeed-vuart drivers/tty/serial/8250: Make Aspeed VUART SIRQ polarity configurable 2019-10-04 15:05:20 +02:00
sysfs-driver-dma-idxd dmaengine: idxd: deprecate token sysfs attributes for read buffers 2022-01-05 13:14:25 +05:30
sysfs-driver-dma-ioatdma docs: ABI: sysfs-driver-dma-ioatdma: what starts with /sys 2020-11-02 13:45:37 +01:00
sysfs-driver-firmware-zynqmp docs: ABI: fix syntax to be parsed using ReST notation 2020-10-30 13:12:39 +01:00
sysfs-driver-ib_srp docs: ABI: stable: make files ReST compatible 2020-10-30 13:07:01 +01:00
sysfs-driver-mlxreg-io docs: ABI: fix documentation warning in sysfs-driver-mlxreg-io 2021-10-22 10:57:11 +02:00
sysfs-driver-qla2xxx
sysfs-driver-speakup speakup: Make dectlk flush timeout configurable 2021-02-04 17:05:48 +01:00
sysfs-driver-usb-usbtmc usb: usbtmc: Remove sysfs group TermChar and auto_abort 2018-09-20 13:04:03 +02:00
sysfs-driver-w1_ds28e04 docs: w1: convert to ReST and add to the kAPI group of docs 2019-07-31 14:16:17 -06:00
sysfs-driver-w1_ds28ea00 docs: w1: convert to ReST and add to the kAPI group of docs 2019-07-31 14:16:17 -06:00
sysfs-driver-w1_ds2438 w1: ds2438: support for writing to offset register 2021-05-21 14:51:33 +02:00
sysfs-firmware-efi-vars docs: ABI: stable: make files ReST compatible 2020-10-30 13:07:01 +01:00
sysfs-firmware-opal-dump docs: ABI: stable: make files ReST compatible 2020-10-30 13:07:01 +01:00
sysfs-firmware-opal-elog docs: ABI: stable: make files ReST compatible 2020-10-30 13:07:01 +01:00
sysfs-fs-orangefs Orangefs: kernel client part 6 2015-10-03 11:39:59 -04:00
sysfs-hypervisor-xen docs: ABI: stable: make files ReST compatible 2020-10-30 13:07:01 +01:00
sysfs-kernel-notes docs: stable-ABI: Document /sys/kernel/notes 2020-09-16 12:17:47 -06:00
sysfs-module ABI: stable/sysfs-module: document version and srcversion 2021-09-28 12:48:14 +02:00
sysfs-transport-srp scsi_transport_srp: Add periodic reconnect support 2013-11-08 14:43:16 -08:00
thermal-notification
vdso docs: ABI: vdso: use the right format for ABI 2020-10-30 13:12:53 +01:00