linux-kernel - Re: [PATCH v7 0/8] Add functions for getting and setting registers related to autonomous selection in cppc

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Message-ID: <f6904bb1-f41f-4be9-92bb-92fec509a821@amd.com>
Date: Fri, 11 Apr 2025 13:18:14 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Lifeng Zheng <zhenglifeng1@...wei.com>, rafael@...nel.org,
 lenb@...nel.org, robert.moore@...el.com, viresh.kumar@...aro.org,
 gautham.shenoy@....com, ray.huang@....com, perry.yuan@....com,
 pierre.gondois@....com, sumitg@...dia.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,
 jonathan.cameron@...wei.com, zhanjie9@...ilicon.com, lihuisong@...wei.com,
 cenxinghai@...artners.com, hepeng68@...wei.com
Subject: Re: [PATCH v7 0/8] Add functions for getting and setting registers
 related to autonomous selection in cppc_acpi

On 4/11/2025 4:38 AM, Lifeng Zheng wrote:
> The patch series is organized in two parts:
> 
>   - patch 1-6 refactor out the general CPPC register get and set functions
>     in cppc_acpi.c
> 
>   - patches 7-8 add functions for getting and setting values of auto_sel,
>     energy_perf and auto_act_window in cppc_acpi.c
> 
> Changelog:
> 
> v7:
> 
>   - Fix some typos
>   - Add check of null pointer in cppc_get_reg_val(),
>     cppc_get_auto_act_window() and cppc_get_auto_sel()
>   - Replace ternary operator with logical expression in cppc_get_reg_val()
> 
> v6:
> 
>   - Remove the last patch, will resent it in the future after reaching an
>     agreement with Sumit
>   - split patch 3 into 2 smaller patches
>   - Remove the printing of reg_idx in cppc_get_reg_val() and
>     cppc_set_reg_val()
>   - Change the logic for determing whether a register is supported in
>     cppc_get_reg_val() and cppc_set_reg_val()
> 
> 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
> 
> ---
> 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/
> v5: https://lore.kernel.org/all/20250206131428.3261578-1-zhenglifeng1@huawei.com/
> v6: https://lore.kernel.org/all/20250409065703.1461867-1-zhenglifeng1@huawei.com/
> 
> 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: Extract cppc_get_reg_val_in_pcc()
>    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
> 
>   drivers/acpi/cppc_acpi.c     | 313 +++++++++++++++++++++--------------
>   drivers/cpufreq/amd-pstate.c |   3 +-
>   include/acpi/cppc_acpi.h     |  30 +++-
>   3 files changed, 219 insertions(+), 127 deletions(-)
> 

Reviewed-by: Mario Limonciello <mario.limonciello@....com>