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acpi cppc · Maintained

Maintainers

• M "Rafael J. Wysocki" <rafael@kernel.org>
• M Christian Loehle <christian.loehle@arm.com>

Paths

• F Documentation/admin-guide/acpi/cppc_sysfs.rst
• F drivers/acpi/cppc_acpi.c
• F include/acpi/cppc_acpi.h

Last 30 days

Most active threads (last 7 days)

• HOTtoday PENDING · 1 of 5 reviewed [PATCH v7 0/5] cpufreq: CPPC: Preserve OSPM-set registers across hotplug and unload
  2026-10-30 09:33 · 2 replies in 7d · Sumit Gupta <sumitg@nvidia.com>
• HOTtoday [PATCH v8 0/3] ACPI / cpufreq: CPPC: Add ospm_nominal_perf support
  2026-10-30 17:29 · 1 reply in 7d · Sumit Gupta <sumitg@nvidia.com>

Active reviewers (last 30 days)

• K Prateek Nayak <kprateek.nayak@amd.com>
  5 attestations (2 Reviewed-by, 3 Tested-by) · last on 2026-10-30
• Christian Loehle <christian.loehle@arm.com>
  1 attestation (1 Reviewed-by) · last on 2026-10-30
• Rafael J. Wysocki (Intel) <rafael@kernel.org>
  1 attestation (1 Acked-by) · last on 2026-10-01

Recent patches

Most-recent 30 patches in this subsystem on linux-pm (capped at 30), ordered by date desc.

• HOTtoday [PATCH v8 1/3] ACPI: CPPC: Add ospm_nominal_perf support
  2026-10-30 · Sumit Gupta <sumitg@nvidia.com>
• [PATCH v7 1/5] ACPI: CPPC: Order performance-control updates
  2026-10-30 · Sumit Gupta <sumitg@nvidia.com>
• HOTtoday REVIEWED: 3 (3M) [PATCH v7 3/5] ACPI: CPPC: Make autonomous selection helpers take a u64
  2026-10-30 · Sumit Gupta <sumitg@nvidia.com>
• COOLING8d SUPERSEDED [PATCH v6 1/5] ACPI: CPPC: Order performance-control updates
  2026-10-20 · Sumit Gupta <sumitg@nvidia.com>
• COOLING8d SUPERSEDED: 2 (2M) [PATCH v6 3/5] ACPI: CPPC: Make autonomous selection helpers take a u64
  2026-10-20 · Sumit Gupta <sumitg@nvidia.com>
• COLD16d [PATCH 05/11] ACPI: CPPC: Free cpc_desc in kobject release callback
  2026-10-13 · Ian Rogers <irogers@google.com>
• COLD29d LANDED: 2 (2M) [PATCH v4 1/3] ACPI: CPPC: Refactor boost ratio handling
  2026-10-01 · Mario Limonciello <mario.limonciello@amd.com>
• COLD29d REVIEWED: 1 (1M) [PATCH v3 1/3] ACPI: CPPC: Refactor boost ratio handling
  2026-09-24 · Mario Limonciello (AMD) <superm1@kernel.org>
• COLD32d [PATCH v4 6/8] ACPI: CPPC: Factor out cpc_read_reg() and cpc_write_reg()
  2026-09-22 · Lifeng Zheng <zhenglifeng1@huawei.com>
• COLD32d [PATCH v4 3/8] ACPI: CPPC: Refactor resource cleanup into free_reg_resource()
  2026-09-22 · Lifeng Zheng <zhenglifeng1@huawei.com>
• COLD32d [PATCH v4 4/8] ACPI: CPPC: Parse Resource Priority Register entries from _CPC package
  2026-09-22 · Lifeng Zheng <zhenglifeng1@huawei.com>
• COLD32d [PATCH v4 7/8] ACPI: CPPC: Add Resource Priority accessors
  2026-09-22 · Lifeng Zheng <zhenglifeng1@huawei.com>
• COLD32d [PATCH v4 8/8] cpufreq: cppc: Expose Resource Priority attributes via sysfs
  2026-09-22 · Lifeng Zheng <zhenglifeng1@huawei.com>
• COLD32d [PATCH v4 5/8] ACPI: CPPC: Store optional flag in cpc_register_resource
  2026-09-22 · Lifeng Zheng <zhenglifeng1@huawei.com>
• COLD32d [PATCH v4 2/8] ACPI: CPPC: Refactor element parsing into parse_cpc_element()
  2026-09-22 · Lifeng Zheng <zhenglifeng1@huawei.com>
• COLD32d [PATCH v4 1/8] ACPI: CPPC: Prepare cpc_register_resource for Package-type entries
  2026-09-22 · Lifeng Zheng <zhenglifeng1@huawei.com>
• COLD39d Re: [PATCH v4 1/4] cpufreq: CPPC: Keep the policy across CPU hotplug
  2026-09-19 · Christian Loehle <christian.loehle@arm.com>
• COLD42d LANDED [PATCH v7 18/20] ACPI: CPPC: Accept requests to retain immutable autonomous selection
  2026-09-16 · Christian Loehle <christian.loehle@arm.com>
• COLD42d LANDED [PATCH v7 16/20] ACPI: CPPC: Validate FFH register fields before hardware access
  2026-09-16 · Christian Loehle <christian.loehle@arm.com>
• COLD42d LANDED [PATCH v7 15/20] ACPI: CPPC: Keep Performance Limited clearable on NVIDIA T41
  2026-09-16 · Christian Loehle <christian.loehle@arm.com>
• COLD42d LANDED [PATCH v7 13/20] ACPI: CPPC: Validate SystemIO overlaps across processors
  2026-09-16 · Christian Loehle <christian.loehle@arm.com>
• COLD42d LANDED [PATCH v7 14/20] ACPI: CPPC: Clear Performance Limited without a stale read
  2026-09-16 · Christian Loehle <christian.loehle@arm.com>
• COLD42d LANDED [PATCH v7 12/20] ACPI: CPPC: Validate PCC overlaps across processors
  2026-09-16 · Christian Loehle <christian.loehle@arm.com>
• COLD42d LANDED [PATCH v7 11/20] ACPI: CPPC: Validate SystemIO register layouts
  2026-09-16 · Christian Loehle <christian.loehle@arm.com>
• COLD42d LANDED [PATCH v7 09/20] ACPI: CPPC: Reject direct reads of write-only controls
  2026-09-16 · Christian Loehle <christian.loehle@arm.com>
• COLD42d LANDED [PATCH v7 10/20] ACPI: CPPC: Validate and access PCC register layouts
  2026-09-16 · Christian Loehle <christian.loehle@arm.com>
• COLD42d LANDED [PATCH v7 08/20] ACPI: CPPC: Reject unsafe cross-CPU SystemMemory RMW
  2026-09-16 · Christian Loehle <christian.loehle@arm.com>
• COLD42d LANDED [PATCH v7 07/20] ACPI: CPPC: Release PCC data after probe failures
  2026-09-16 · Christian Loehle <christian.loehle@arm.com>
• COLD42d LANDED [PATCH v7 06/20] ACPI: CPPC: Release CPC descriptors through kobject
  2026-09-16 · Christian Loehle <christian.loehle@arm.com>
• COLD42d LANDED [PATCH v7 05/20] ACPI: CPPC: Serialize PCC EPP payload updates
  2026-09-16 · Christian Loehle <christian.loehle@arm.com>

Needs attention (review trailers in, no pickup)

Patches with review trailers that haven't landed in mainline and haven't been Acked by a maintainer. Oldest first.

• STALE156d REVIEWED: 2 (2M) [PATCH v3 1/4] ACPI: CPPC: Add support for reading HighestFreq +3 more in this series
  2026-05-14 · Mario Limonciello <mario.limonciello@amd.com> · 1 Reviewed-by, 1 Tested-by
• STALE88d REVIEWED: 1 (0M) [PATCH v3 2/3] ACPI: CPPC: Skip desired_perf read in cppc_get_perf() +2 more in this series
  2026-08-03 · Christian Loehle <christian.loehle@arm.com> · 1 Reviewed-by
• COLD29d REVIEWED: 1 (1M) [PATCH v3 1/3] ACPI: CPPC: Refactor boost ratio handling +2 more in this series
  2026-09-24 · Mario Limonciello (AMD) <superm1@kernel.org> · 1 Tested-by

Quiet for 30+ days

Patches with no review trailers and no replies. Either the author is heads-down elsewhere or these slipped through. Oldest first.

• STALE186d [PATCH 3/6] ACPI: CPPC: Add support for reading HighestFreq +5 more in this series
  2026-04-27 · Mario Limonciello (AMD) <superm1@kernel.org>
• STALE100d LANDED [PATCH 1/2] ACPI: CPPC: Check all controls for fast switching +1 more in this series
  2026-07-22 · Christian Loehle <christian.loehle@arm.com>
• STALE88d [PATCH 2/3] ACPI: CPPC: Avoid locking standalone full-width registers +2 more in this series
  2026-07-24 · Christian Loehle <christian.loehle@arm.com>
• COLD42d LANDED [PATCH v7 07/20] ACPI: CPPC: Release PCC data after probe failures +19 more in this series
  2026-09-16 · Christian Loehle <christian.loehle@arm.com>
• COLD32d [PATCH v4 1/8] ACPI: CPPC: Prepare cpc_register_resource for Package-type entries +7 more in this series
  2026-09-22 · Lifeng Zheng <zhenglifeng1@huawei.com>