linux-kernel - Re: [PATCH v5 0/8] Support for autonomous selection in cppc

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Message-ID: <0097a9a3-fe61-4200-9a54-5a9c81d3219c@huawei.com>
Date: Thu, 13 Feb 2025 09:55:38 +0800
From: "zhenglifeng (A)" <zhenglifeng1@...wei.com>
To: <rafael@...nel.org>, <lenb@...nel.org>, <robert.moore@...el.com>,
	<viresh.kumar@...aro.org>, <mario.limonciello@....com>,
	<gautham.shenoy@....com>, <ray.huang@....com>, <pierre.gondois@....com>
CC: <acpica-devel@...ts.linux.dev>, <linux-acpi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linuxarm@...wei.com>, <yumpusamongus@...il.com>,
	<srinivas.pandruvada@...ux.intel.com>, <jonathan.cameron@...wei.com>,
	<zhanjie9@...ilicon.com>, <lihuisong@...wei.com>, <hepeng68@...wei.com>,
	<fanghao11@...wei.com>
Subject: Re: [PATCH v5 0/8] Support for autonomous selection in cppc_cpufreq

On 2025/2/6 21:14, Lifeng Zheng wrote:
> Add sysfs interfaces for CPPC autonomous selection in the cppc_cpufreq
> driver.
> 
> The patch series is organized in two parts:
> 
>  - patch 1-5 refactor out the general CPPC register get and set functions
>    in cppc_acpi.c
> 
>  - patches 6-8 expose sysfs files for users to control CPPC autonomous
>    selection when supported
> 
> Changelog:
> 
> v5:
> 
>  - add more explanation to the commit logs and comments
>  - change REG_OPTIONAL from bin to hex
>  - split patch 2 into 3 smaller patches
>  - remove CPPC_REG_VAL_READ() and CPPC_REG_VAL_WRITE() macros
>  - move the modification part in patch 5 into a separate patch
>  - rename the sysfs file from "energy_perf" to
>    energy_performance_preference_val
> 
> v4:
> 
>  - add REG_OPTIONAL and IS_OPTIONAL_CPC_REG to judge if a cpc register is
>    an optional one
>  - check whether the register is optional before CPC_SUPPORTED check in
>    cppc_get_reg_val() and cppc_set_reg_val()
>  - check the register's type in cppc_set_reg_val()
>  - add macros to generally implement registers getting and setting
>    functions
>  - move some logic codes from cppc_cpufreq.c to cppc_acpi.c
>  - replace cppc_get_auto_sel_caps() by cppc_get_auto_sel()
> 
> v3:
> 
>  - change cppc_get_reg() and cppc_set_reg() name to cppc_get_reg_val() and
>    cppc_set_reg_val()
>  - extract cppc_get_reg_val_in_pcc() and cppc_set_reg_val_in_pcc()
>  - return the result of cpc_read() in cppc_get_reg_val()
>  - add pr_debug() in cppc_get_reg_val_in_pcc() when pcc_ss_id < 0
>  - rename 'cpunum' to 'cpu' in cppc_get_reg_val()
>  - move some macros from drivers/cpufreq/cppc_cpufreq.c to
>    include/acpi/cppc_acpi.h with a CPPC_XXX prefix
> 
> v2:
> 
>  - fix some incorrect placeholder
>  - change kstrtoul to kstrtobool in store_auto_select
> 
> Lifeng Zheng (8):
>   ACPI: CPPC: Add IS_OPTIONAL_CPC_REG macro to judge if a cpc_reg is
>     optional
>   ACPI: CPPC: Optimize cppc_get_perf()
>   ACPI: CPPC: Rename cppc_get_perf() to cppc_get_reg_val()
>   ACPI: CPPC: Add cppc_set_reg_val()
>   ACPI: CPPC: Refactor register value get and set ABIs
>   ACPI: CPPC: Modify cppc_get_auto_sel_caps() to cppc_get_auto_sel()
>   ACPI: CPPC: Add three functions related to autonomous selection
>   cpufreq: CPPC: Support for autonomous selection in cppc_cpufreq
> 
>  .../ABI/testing/sysfs-devices-system-cpu      |  54 ++++
>  drivers/acpi/cppc_acpi.c                      | 303 +++++++++++-------
>  drivers/cpufreq/amd-pstate.c                  |   3 +-
>  drivers/cpufreq/cppc_cpufreq.c                | 109 +++++++
>  include/acpi/cppc_acpi.h                      |  30 +-
>  5 files changed, 372 insertions(+), 127 deletions(-)
> 

Gentle ping.

Attach discussions of previous versions:
v1: https://lore.kernel.org/all/20241114084816.1128647-1-zhenglifeng1@huawei.com/
v2: https://lore.kernel.org/all/20241122062051.3658577-1-zhenglifeng1@huawei.com/
v3: https://lore.kernel.org/all/20241216091603.1247644-1-zhenglifeng1@huawei.com/
v4: https://lore.kernel.org/all/20250113122104.3870673-1-zhenglifeng1@huawei.com/