linux-kernel - [PATCH v6 0/8] Add functions for getting and setting registers related to autonomous selection in cppc

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Message-ID: <20250409065703.1461867-1-zhenglifeng1@huawei.com>
Date: Wed, 9 Apr 2025 14:56:55 +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>, <perry.yuan@....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>,
	<cenxinghai@...artners.com>, <zhenglifeng1@...wei.com>, <hepeng68@...wei.com>
Subject: [PATCH v6 0/8] Add functions for getting and setting registers related to autonomous selection in cppc_acpi

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:

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/

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     | 304 +++++++++++++++++++++--------------
 drivers/cpufreq/amd-pstate.c |   3 +-
 include/acpi/cppc_acpi.h     |  30 +++-
 3 files changed, 210 insertions(+), 127 deletions(-)

-- 
2.33.0