linux-kernel - [PATCH v2 0/7] Enhanced autonomous selection and API

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Message-ID: <20250823200121.1320197-1-sumitg@nvidia.com>
Date: Sun, 24 Aug 2025 01:31:13 +0530
From: Sumit Gupta <sumitg@...dia.com>
To: <rafael@...nel.org>, <viresh.kumar@...aro.org>, <lenb@...nel.org>,
	<robert.moore@...el.com>, <corbet@....net>, <pierre.gondois@....com>,
	<zhenglifeng1@...wei.com>, <ray.huang@....com>, <gautham.shenoy@....com>,
	<mario.limonciello@....com>, <perry.yuan@....com>,
	<linux-pm@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <acpica-devel@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>
CC: <linux-tegra@...r.kernel.org>, <treding@...dia.com>,
	<jonathanh@...dia.com>, <vsethi@...dia.com>, <ksitaraman@...dia.com>,
	<sanjayc@...dia.com>, <bbasu@...dia.com>, <sumitg@...dia.com>
Subject: [PATCH v2 0/7] Enhanced autonomous selection and API

This patch series enhances the ACPI CPPC CPUFREQ driver with
comprehensive support for autonomous selection, expanded runtime
control interfaces and improved API naming.

It adds support for below:
- Expose sysfs to read/write the Mininum/Maximum Performance Register
  and update the policy min/max accordingly.
    /sys/.../cpufreq/policy*/min_perf and max_perf

- Expose sysfs to read/write the Performance Limited Register.
    /sys/.../cpufreq/policy*/perf_limited

- When toggling autonomous selection, synchronize the policy limits
  by updating the policy min/max.

- System-wide autonomous mode configuration via 'auto_sel_mode' boot
  parameter. Mode can be switched dynamically on individual CPUs.

- Rename APIs to improve the inconsistent naming for clarity.

The patches are grouped as below:
- Patch 1: Improvement for clarity. Can be applied independently.
- Patch 2: Extend existing APIs. Can be applied independently.
- Patch 3: Sysfs to update min/max_perf. Can be applied independently.
- Patch 4: Sysfs to update perf_limited. Can be applied independently.
- Patch 5: Update policy min/max on auto_select. Depends on 'Patch 3'.
- Patch 6: add syfs documentation. Depends on 'Patch 3 and 4'.
- Patch 7: Boot Parameter Support. Depends on 'Patch 3 and 5'.

---
v1[1] -> v2:
- Move CPC register set sysfs from acpi_cppc to cpufreq directory.
- No sysfs to set auto_sel and epp. They were merged from diff series.
- Remove 'cppc_cpufreq_epp' instance of the 'cppc_cpufreq' driver.
- Synchronize perf_min/max with policy min/max.
- Update policy min/max Toggling auto_select.
- add sysfs to update the perf_limited register.

Sumit Gupta (7):
  ACPI: CPPC: add perf control read API and clarify naming
  ACPI: CPPC: extend APIs to support auto_sel and epp
  ACPI: CPPC: add APIs and sysfs interface for min/max_perf
  ACPI: CPPC: add APIs and sysfs interface for perf_limited register
  cpufreq: CPPC: update policy min/max when toggling auto_select
  cpufreq: CPPC: Add sysfs for min/max_perf and perf_limited
  cpufreq: CPPC: add autonomous mode boot parameter support

 .../ABI/testing/sysfs-devices-system-cpu      |  43 ++
 .../admin-guide/kernel-parameters.txt         |  12 +
 drivers/acpi/cppc_acpi.c                      | 208 ++++++++-
 drivers/cpufreq/amd-pstate.c                  |   2 +-
 drivers/cpufreq/cppc_cpufreq.c                | 400 +++++++++++++++++-
 include/acpi/cppc_acpi.h                      |  51 ++-
 6 files changed, 668 insertions(+), 48 deletions(-)

[1] https://lore.kernel.org/lkml/20250211103737.447704-1-sumitg@nvidia.com/

-- 
2.34.1