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* [PATCH 0/3] arch_topology, ACPI: populate cpu capacity from CPPC
@ 2021-05-14  9:53 Ionela Voinescu
  2021-05-14  9:53 ` [PATCH 1/3] x86, ACPI: rename init_freq_invariance_cppc to arch_init_invariance_cppc Ionela Voinescu
                   ` (3 more replies)
  0 siblings, 4 replies; 12+ messages in thread
From: Ionela Voinescu @ 2021-05-14  9:53 UTC (permalink / raw)
  To: Sudeep Holla, Rafael J . Wysocki, Thomas Gleixner, Ingo Molnar,
	Giovanni Gherdovich, Catalin Marinas, Will Deacon,
	Valentin Schneider
  Cc: linux-kernel, linux-acpi, linux-arm-kernel

Hi all,

These are a few trivial patches to populate cpu capacity information
using performance information from ACPI's CPPC.

I've tied this functionality to the existing function
init_freq_invariance_cppc() called in acpi_cppc_processor_probe().
This function is renamed to a more generic arch_init_invariance_cppc().

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@ubuntu:~# dmesg | grep cpu_capacity
[    2.157494] init_cpu_capacity_cppc: CPU0 cpu_capacity=38300 (raw).
[    2.163699] init_cpu_capacity_cppc: CPU1 cpu_capacity=38300 (raw).
[    2.169899] init_cpu_capacity_cppc: CPU2 cpu_capacity=38300 (raw).
[    2.176098] init_cpu_capacity_cppc: CPU3 cpu_capacity=38300 (raw).
[    2.182296] init_cpu_capacity_cppc: CPU4 cpu_capacity=102400 (raw).
[    2.188581] init_cpu_capacity_cppc: CPU5 cpu_capacity=102400 (raw).
[    2.194867] cpu_capacity: capacity_scale=102400
[    2.199409] cpu_capacity: CPU0 cpu_capacity=383
[    2.203952] cpu_capacity: CPU1 cpu_capacity=383
[    2.208495] cpu_capacity: CPU2 cpu_capacity=383
[    2.213037] cpu_capacity: CPU3 cpu_capacity=383
[    2.217580] cpu_capacity: CPU4 cpu_capacity=1024
[    2.222209] cpu_capacity: CPU5 cpu_capacity=1024
[    2.226886] init_cpu_capacity_cppc: cpu_capacity initialization done

root@ubuntu:~# 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

All works as expected even if ACPI processor support is built as a
module.

Patches are based on v5.13-rc1.

Let me know what you think!

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      | 39 +++++++++++++++++++++++++++++++
 include/linux/arch_topology.h     |  4 ++++
 5 files changed, 51 insertions(+), 4 deletions(-)

-- 
2.29.2.dirty


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^ permalink raw reply	[flat|nested] 12+ messages in thread

end of thread, other threads:[~2021-05-19  9:54 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-14  9:53 [PATCH 0/3] arch_topology, ACPI: populate cpu capacity from CPPC Ionela Voinescu
2021-05-14  9:53 ` [PATCH 1/3] x86, ACPI: rename init_freq_invariance_cppc to arch_init_invariance_cppc Ionela Voinescu
2021-05-14  9:53 ` [PATCH 2/3] arch_topology: obtain cpu capacity using information from CPPC Ionela Voinescu
2021-05-14 16:16   ` Dietmar Eggemann
2021-05-19  9:46     ` Ionela Voinescu
2021-05-18 13:12   ` Valentin Schneider
2021-05-14  9:53 ` [PATCH 3/3] arm64, topology: enable use of init_cpu_capacity_cppc() Ionela Voinescu
2021-05-14 10:35   ` Catalin Marinas
2021-05-14 16:17   ` Dietmar Eggemann
2021-05-19  9:48     ` Ionela Voinescu
2021-05-18 13:12 ` [PATCH 0/3] arch_topology, ACPI: populate cpu capacity from CPPC Valentin Schneider
2021-05-19  9:51   ` Ionela Voinescu

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