[PATCH v3 0/4] Support for autonomous selection in cppc_cpufreq

[Lifeng Zheng]

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@xxxxxxxxxx/

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