linux-kernel - [PATCH v3 0/4] Support for autonomous selection in cppc

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Message-ID: <20241216091603.1247644-1-zhenglifeng1@huawei.com>
Date: Mon, 16 Dec 2024 17:15:59 +0800
From: Lifeng Zheng <zhenglifeng1@...wei.com>
To: <rafael@...nel.org>, <lenb@...nel.org>, <robert.moore@...el.com>,
	<viresh.kumar@...aro.org>
CC: <acpica-devel@...ts.linux.dev>, <linux-acpi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linuxarm@...wei.com>, <pierre.gondois@....com>, <ionela.voinescu@....com>,
	<jonathan.cameron@...wei.com>, <zhanjie9@...ilicon.com>,
	<lihuisong@...wei.com>, <zhenglifeng1@...wei.com>, <hepeng68@...wei.com>,
	<fanghao11@...wei.com>
Subject: [PATCH v3 0/4] Support for autonomous selection in cppc_cpufreq

Add sysfs interfaces for CPPC autonomous selection in the cppc_cpufreq
driver.

The patch series is organized in two parts:

 - patch 1-2 refactor out the general CPPC register get and set functions
   in cppc_acpi.c

 - patches 3-4 expose sysfs files for users to control CPPC autonomous
   selection when supported

Since Pierre and me have discussed about whether or not to show
auto_act_window and energy_perf when auto_select is disabled. It seems
like whether to show these two files has their own points. We'd like to
ask for some advice.

Relevant discussion:
[1] https://lore.kernel.org/all/522721da-1a5c-439c-96a8-d0300dd0f906@huawei.com/

Change since v2:
 - 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

Change since v1:
 - fix some incorrect placeholder
 - change kstrtoul to kstrtobool in store_auto_select

Lifeng Zheng (4):
  ACPI: CPPC: Add cppc_get_reg_val and cppc_set_reg_val function
  ACPI: CPPC: Refactor register value get and set ABIs
  ACPI: CPPC: Add autonomous selection ABIs
  cpufreq: CPPC: Support for autonomous selection in cppc_cpufreq

 .../ABI/testing/sysfs-devices-system-cpu      |  54 ++++
 drivers/acpi/cppc_acpi.c                      | 266 +++++++++---------
 drivers/cpufreq/cppc_cpufreq.c                | 129 +++++++++
 include/acpi/cppc_acpi.h                      |  29 ++
 4 files changed, 347 insertions(+), 131 deletions(-)

-- 
2.33.0