linux-kernel - Re: [PATCH v2 0/15] powercap/intel_rapl: Introduce RAPL TPMI support

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Date:   Wed, 24 May 2023 18:54:31 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Zhang Rui <rui.zhang@...el.com>
Cc:     linux-pm@...r.kernel.org, rafael.j.wysocki@...el.com,
        daniel.lezcano@...aro.org, linux-kernel@...r.kernel.org,
        srinivas.pandruvada@...el.com
Subject: Re: [PATCH v2 0/15] powercap/intel_rapl: Introduce RAPL TPMI support

On Wed, Apr 19, 2023 at 4:44 AM Zhang Rui <rui.zhang@...el.com> wrote:
>
> The TPMI (Topology Aware Register and PM Capsule Interface) provides a
> flexible, extendable and PCIe enumerable MMIO interface for PM features.
>
> The TPMI documentation can be downloaded from:
> https://github.com/intel/tpmi_power_management
>
> Intel RAPL (Running Average Power Limit) is one of the features that
> benefit from this. Using TPMI Interface has advantage over traditional MSR
> (Model Specific Register) interface, where a thread needs to be scheduled
> on the target CPU to read or write. Also the RAPL features vary between
> CPU models, and hence lot of model specific code. Here TPMI provides an
> architectural interface by providing hierarchical tables and fields,
> which will not need any model specific implementation.
>
> Given that there are some differences between RAPL TPMI Interface and the
> existing RAPL MSR/MMIO Interface, this patch series improves the RAPL
> common code to satisfy the new requirements from TPMI interface, and then
> introduces the RAPL TPMI Interface driver.
>
> Patch 1-4       cleanups and preparation work.
> Patch 5         adds support for per Domain Unit register.
> Patch 6-10      improves Power Limits handling, and provides support
>                 for per Power Limit register, and per Power Limit Lock.
> Patch 11-12     support rapl_package without online CPUs. So that TPMI
>                 rapl_package still works with whole package offlined.
> Patch 13-15     introduces RAPL Core support for TPMI Interface and the
>                 RAPL TPMI Interface driver.
>
> This series depends on the TPMI base driver which has been merged in 6.3-rc1.
>
> thanks,
> rui
> ---
> Changes since v1:
>    - use set_defaults() and variable name 'defaults' for rapl_defaults
>      structure.
>    - use 'rpi_default' instead of 'rpis' for the default rapl primitive
>      information of MSR/MMIO Interface.
>    - rephase the changelog of patch 7/15.
>    - change the subject of patch 10/15 and use a helper for getting the
>      primitive for power limit LOCK bit control.
>
> ----------------------------------------------------------------
> Zhang Rui (15):
>       powercap/intel_rapl: Remove unused field in struct rapl_if_priv
>       powercap/intel_rapl: Allow probing without CPUID match
>       powercap/intel_rapl: Support per Interface rapl_defaults
>       powercap/intel_rapl: Support per Interface primitive information
>       powercap/intel_rapl: Support per domain energy/power/time unit
>       powercap/intel_rapl: Use index to initialize primitive information
>       powercap/intel_rapl: Change primitive order
>       powercap/intel_rapl: Use bitmap for Power Limits
>       powercap/intel_rapl: Cleanup Power Limits support
>       powercap/intel_rapl: Introduce per Power Limit lock
>       powercap/intel_rapl: Remove redundant cpu parameter
>       powercap/intel_rapl: Make cpu optional for rapl_package
>       powercap/intel_rapl: Introduce RAPL I/F type
>       powercap/intel_rapl: Introduce core support for TPMI interface
>       powercap/intel_rapl_tpmi: Introduce RAPL TPMI interface driver
>
>  drivers/powercap/Kconfig                           |  14 +
>  drivers/powercap/Makefile                          |   1 +
>  drivers/powercap/intel_rapl_common.c               | 868 ++++++++++++---------
>  drivers/powercap/intel_rapl_msr.c                  |  14 +-
>  drivers/powercap/intel_rapl_tpmi.c                 | 325 ++++++++
>  .../intel/int340x_thermal/processor_thermal_rapl.c |  11 +-
>  include/linux/intel_rapl.h                         |  40 +-
>  7 files changed, 875 insertions(+), 398 deletions(-)
>  create mode 100644 drivers/powercap/intel_rapl_tpmi.c

The whole series has been applied as 6.5 material, thanks!