linux-kernel - [PATCH v4 0/6] Support for autonomous selection in cppc

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Message-ID: <20250113122104.3870673-1-zhenglifeng1@huawei.com>
Date: Mon, 13 Jan 2025 20:20:58 +0800
From: Lifeng Zheng <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>, <jonathan.cameron@...wei.com>,
	<zhanjie9@...ilicon.com>, <lihuisong@...wei.com>, <zhenglifeng1@...wei.com>,
	<hepeng68@...wei.com>, <fanghao11@...wei.com>
Subject: [PATCH v4 0/6] 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 1-4 refactor out the general CPPC register get and set functions
   in cppc_acpi.c

 - patches 5-6 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/

Changelog:

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 (6):
  ACPI: CPPC: Add IS_OPTIONAL_CPC_REG macro
  ACPI: CPPC: Add cppc_get_reg_val and cppc_set_reg_val function
  ACPI: CPPC: Add macros to generally implement registers getting and
    setting functions
  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                      | 332 +++++++++---------
 drivers/cpufreq/amd-pstate.c                  |   3 +-
 drivers/cpufreq/cppc_cpufreq.c                | 109 ++++++
 include/acpi/cppc_acpi.h                      |  30 +-
 5 files changed, 359 insertions(+), 169 deletions(-)

-- 
2.33.0