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Subject[PATCH v5 0/1] Interface to represent PAPR firmware attributes
Date
RFC: https://lkml.org/lkml/2021/6/4/791
PATCH v1: https://lkml.org/lkml/2021/6/16/805
PATCH v2: https://lkml.org/lkml/2021/7/6/138
PATCH v3: https://lkml.org/lkml/2021/7/12/2799
PATCH v4: https://lkml.org/lkml/2021/7/16/532

Changelog v4 --> v5
Based on comments from Fabiano
1. Cleaned up unused/redundant headers
2. Make "add_attr_group" use MAX_ATTRS instead of paramterizing "len"
3. Cleanup previous "pgs[idx].pg.attrs" allocations on failiure
4. Replaced strlen call with strnlen
5. Cleanup of pgs structures for "num_attrs" instead of "MAX_ATTRS"

Also, have implemented a POC using this interface for the powerpc-utils'
ppc64_cpu --frequency command-line tool to utilize this information
in userspace.
The POC for the new interface has been hosted here:
https://github.com/pratiksampat/powerpc-utils/tree/H_GET_ENERGY_SCALE_INFO_v2

Sample output from the powerpc-utils tool is as follows:

# ppc64_cpu --frequency
Power and Performance Mode: XXXX
Idle Power Saver Status : XXXX
Processor Folding Status : XXXX --> Printed if Idle power save status is supported

Platform reported frequencies --> Frequencies reported from the platform's H_CALL i.e PAPR interface
min : NNNN GHz
max : NNNN GHz
static : NNNN GHz

Tool Computed frequencies
min : NNNN GHz (cpu XX)
max : NNNN GHz (cpu XX)
avg : NNNN GHz

Pratik R. Sampat (1):
powerpc/pseries: Interface to represent PAPR firmware attributes

.../sysfs-firmware-papr-energy-scale-info | 26 ++
arch/powerpc/include/asm/hvcall.h | 24 +-
arch/powerpc/kvm/trace_hv.h | 1 +
arch/powerpc/platforms/pseries/Makefile | 3 +-
.../pseries/papr_platform_attributes.c | 317 ++++++++++++++++++
5 files changed, 369 insertions(+), 2 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-firmware-papr-energy-scale-info
create mode 100644 arch/powerpc/platforms/pseries/papr_platform_attributes.c

--
2.31.1

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