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* [PATCH v7 0/1] Interface to represent PAPR firmware attributes
@ 2021-07-23  5:46 Pratik R. Sampat
  2021-07-23  5:46 ` [PATCH v7 1/1] powerpc/pseries: " Pratik R. Sampat
  0 siblings, 1 reply; 4+ messages in thread
From: Pratik R. Sampat @ 2021-07-23  5:46 UTC (permalink / raw)
  To: mpe, benh, paulus, farosas, kjain, linuxppc-dev, kvm-ppc,
	linux-kernel, psampat, pratik.r.sampat

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
PATCH v5: https://lkml.org/lkml/2021/7/19/247
PATCH v6: https://lkml.org/lkml/2021/7/20/36

Changelog v6-->v7
1. Optimize free for pgs attributes to iterate only over the currently
   allocated attributes "idx" instead of free'ing for all

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        | 312 ++++++++++++++++++
 5 files changed, 364 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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2021-07-23  5:46 [PATCH v7 0/1] Interface to represent PAPR firmware attributes Pratik R. Sampat
2021-07-23  5:46 ` [PATCH v7 1/1] powerpc/pseries: " Pratik R. Sampat
2021-07-23  6:10   ` kajoljain
2021-07-23 13:16   ` Fabiano Rosas

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