[PATCH v1 0/2] platform/x86/intel-uncore-freq: Expose instance ID in the sysfs

[Maciej Wieczor-Retman]

In TPMI devices, an instance is a feature copy that's local to the TPMI
device. It has its own control and header registers and it is tied to a
die that is a unit of uncore control.

Uncore Frequency Scaling (UFS) is a special feature in the sense that it
can have instances further split into clusters if there is more than one
per-die.

On older systems the domain_id value exported in sysfs matches the
instance value, as in it is unique in the single TPMI device scope. But
on newer systems that can have multiple clusters on a single die, the
intel-uncore-freq driver behaves differently and the domain_id is a
globally unique value - unique on all TPMI devices. Therefore it's
difficult to match a specific instance to a set of UFS registers for
example visible through /sys/kernel/debug/tpmi directories.

Separately exporting the instance value that's local to a TPMI device
and not globally unique can help restore the now lost value association.

Maciej Wieczor-Retman (2):
  platform/x86/intel-uncore-freq: Rename instance_id
  platform/x86/intel-uncore-freq: Expose instance ID in the sysfs

 .../uncore-frequency/uncore-frequency-common.c  | 16 +++++++++++++---
 .../uncore-frequency/uncore-frequency-common.h  |  8 ++++++--
 .../uncore-frequency/uncore-frequency-tpmi.c    | 17 ++++++++++++++++-
 3 files changed, 35 insertions(+), 6 deletions(-)

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2.53.0