From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Pratik R. Sampat" Date: Mon, 12 Jul 2021 10:52:03 +0000 Subject: [PATCH v3 0/1] Interface to represent PAPR firmware attributes Message-Id: <20210712105140.33388-1-psampat@linux.ibm.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org, linuxppc-dev@lists.ozlabs.org, kvm-ppc@vger.kernel.org, linux-kernel@vger.kernel.org, psampat@linux.ibm.com, pratik.r.sampat@gmail.com 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 Changelog v2 --> v3 Based on a comment from Guatham: 1. Added a versioning check after the H_CALL is made to bail out when the version from the firmware is inconsistent with that in the kernel 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 | 320 ++++++++++++++++++ 5 files changed, 372 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