linux-kernel - [PATCH v3 0/3] arch_topology, ACPI: populate cpu capacity from CPPC

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Message-Id: <20220302180913.13229-1-ionela.voinescu@arm.com>
Date:   Wed,  2 Mar 2022 18:09:10 +0000
From:   Ionela Voinescu <ionela.voinescu@....com>
To:     Sudeep Holla <sudeep.holla@....com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Giovanni Gherdovich <ggherdovich@...e.cz>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Sean Kelley <skelley@...dia.com>
Cc:     Pierre Gondois <pierre.gondois@....com>,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v3 0/3] arch_topology, ACPI: populate cpu capacity from CPPC

Hi all,

v2->v3:
 - v2 can be found at [2]
 - Added sanity checking on perf_caps.highest_perf

v1->v2:
 - v1 can be found at [1]
 - Changed debug prints to the format used on the DT path
 - s/init_cpu_capacity_cppc/topology_init_cpu_capacity_cppc

Patches are based on v5.17-rc6.

The patches have been build tested on x86 and more thoroughly tested on
Juno R2 (arm64), which uses the new functionality, with the following
results:

root@...ldroot:~# dmesg | grep cpu_capacity
[    2.191152] cpu_capacity: CPU0 cpu_capacity=38300 (raw).
[    2.196482] cpu_capacity: CPU1 cpu_capacity=38300 (raw).
[    2.201809] cpu_capacity: CPU2 cpu_capacity=38300 (raw).
[    2.207136] cpu_capacity: CPU3 cpu_capacity=38300 (raw).
[    2.212463] cpu_capacity: CPU4 cpu_capacity=102400 (raw).
[    2.217877] cpu_capacity: CPU5 cpu_capacity=102400 (raw).
[    2.223291] cpu_capacity: capacity_scale=102400
[    2.227834] cpu_capacity: CPU0 cpu_capacity=383
[    2.232376] cpu_capacity: CPU1 cpu_capacity=383
[    2.236919] cpu_capacity: CPU2 cpu_capacity=383
[    2.241462] cpu_capacity: CPU3 cpu_capacity=383
[    2.246004] cpu_capacity: CPU4 cpu_capacity=1024
[    2.250634] cpu_capacity: CPU5 cpu_capacity=1024
[    2.255321] cpu_capacity: cpu_capacity initialization done

root@...ldroot:~# tail -n +1 /sys/devices/system/cpu/cpu*/cpu_capacity
==> /sys/devices/system/cpu/cpu0/cpu_capacity <==
383
==> /sys/devices/system/cpu/cpu1/cpu_capacity <==
383
==> /sys/devices/system/cpu/cpu2/cpu_capacity <==
383
==> /sys/devices/system/cpu/cpu3/cpu_capacity <==
383
==> /sys/devices/system/cpu/cpu4/cpu_capacity <==
1024
==> /sys/devices/system/cpu/cpu5/cpu_capacity <==
1024

[1]
https://lore.kernel.org/lkml/20210514095339.12979-1-ionela.voinescu@arm.com/
[2]
https://lore.kernel.org/lkml/20210824105651.28660-1-ionela.voinescu@arm.com/

Thanks,
Ionela.

Ionela Voinescu (3):
  x86, ACPI: rename init_freq_invariance_cppc to
    arch_init_invariance_cppc
  arch_topology: obtain cpu capacity using information from CPPC
  arm64, topology: enable use of init_cpu_capacity_cppc()

 arch/arm64/include/asm/topology.h |  4 ++++
 arch/x86/include/asm/topology.h   |  2 +-
 drivers/acpi/cppc_acpi.c          |  6 ++---
 drivers/base/arch_topology.c      | 40 +++++++++++++++++++++++++++++++
 include/linux/arch_topology.h     |  4 ++++
 5 files changed, 52 insertions(+), 4 deletions(-)

-- 
2.25.1