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Message-ID: <5162cd2c-e239-4fc6-b2da-2e2fe087cb1b@huawei.com> Date: Mon, 24 Feb 2025 20:49:56 +0800 From: "zhenglifeng (A)" <zhenglifeng1@...wei.com> To: Pierre Gondois <pierre.gondois@....com> CC: "Rafael J. Wysocki" <rafael@...nel.org>, <lenb@...nel.org>, <robert.moore@...el.com>, <viresh.kumar@...aro.org>, <mario.limonciello@....com>, <gautham.shenoy@....com>, <ray.huang@....com>, <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 2025/2/24 18:31, Pierre Gondois wrote: > > > On 2/22/25 11:07, zhenglifeng (A) wrote: >> On 2025/2/19 3:17, Rafael J. Wysocki wrote: >>> On Thu, Feb 13, 2025 at 2:55 AM zhenglifeng (A) <zhenglifeng1@...wei.com> wrote: >>>> >>>> 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. >>> >>> OK, so I'm wondering how this is related to the patch series at >>> >>> https://lore.kernel.org/linux-acpi/20250211103737.447704-1-sumitg@nvidia.com/ >> >> This series refactors some cppc_acpi ABIs and supports cppc autonomous >> selection with sysfs files in cpufreq policy. Later, [1] proposed another >> design with different user interfaces.We will discuss and reach a consensus >> with regard to this. >> >> However, as mentioned in [1], patch 1-7 in this series (the cppc_acpi part) >> are not related to user interfaces, so can be reviewed and applied >> separately. I can also send patch 1-7 as a new thread if preferred. >> >> [1] https://lore.kernel.org/linux-acpi/20250211103737.447704-1-sumitg@nvidia.com/ > > I tried the patchset on a platform which doesn't implement CPC and everything worked well. > As Lifeng said, > PATCH v5 8/8] cpufreq: CPPC: Support for autonomous selection in cppc_cpufreq > seems to be still in discussion, but for patches 1-7 FWIW: > > Reviewed-by: Pierre Gondois <pierre.gondois@....com> Thank you! Regards, Lifeng > > Regards, > Pierre > >> >>> >>>> 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/ >>>> >>> >> >> >
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