drivers/cpufreq/cpufreq.c

File Facts

System

Linux kernel

Corpus path

drivers/cpufreq/cpufreq.c

Extension

.c

Size

82191 bytes

Lines

3083

Domain

Driver Families

Bucket

drivers/cpufreq

Inferred role

Driver Families: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/cpu.h
• linux/cpufreq.h
• linux/cpu_cooling.h
• linux/delay.h
• linux/device.h
• linux/init.h
• linux/kernel_stat.h
• linux/module.h
• linux/mutex.h
• linux/pm_qos.h
• linux/slab.h
• linux/string_choices.h
• linux/suspend.h
• linux/syscore_ops.h
• linux/tick.h
• linux/units.h
• trace/events/power.h

Detected Declarations

• function cpufreq_supports_freq_invariance
• function has_target
• function has_target_index
• function cpufreq_disabled
• function disable_cpufreq
• function have_governor_per_policy
• function get_cpu_idle_time
• function init
• function cpufreq_generic_get
• function cpufreq_cpu_get_raw
• function cpufreq_cpu_put
• function adjust_jiffies
• function adjust_jiffies
• function cpufreq_notify_post_transition
• function cpufreq_freq_transition_begin
• function cpufreq_freq_transition_end
• function cpufreq_list_transition_notifiers
• function cpufreq_enable_fast_switch
• function cpufreq_disable_fast_switch
• function __resolve_freq
• function cpufreq_driver_resolve_freq
• function cpufreq_policy_transition_delay_us
• function show_boost
• function store_boost
• function show_local_boost
• function policy_set_boost
• function store_local_boost
• function cpufreq_parse_policy
• function arch_freq_get_on_cpu
• function cpufreq_avg_freq_supported
• function show_scaling_cur_freq
• function show_cpuinfo_cur_freq
• function show_cpuinfo_avg_freq
• function show_scaling_governor
• function store_scaling_governor
• function show_scaling_driver
• function show_scaling_available_governors
• function cpufreq_show_cpus
• function for_each_cpu
• function show_related_cpus
• function show_affected_cpus
• function store_scaling_setspeed
• function show_scaling_setspeed
• function show_bios_limit
• function show
• function store
• function cpufreq_sysfs_release
• function add_cpu_dev_symlink

Annotated Snippet

core_initcall(cpufreq_core_init);

Annotation

• Immediate include surface: `linux/cpu.h`, `linux/cpufreq.h`, `linux/cpu_cooling.h`, `linux/delay.h`, `linux/device.h`, `linux/init.h`, `linux/kernel_stat.h`, `linux/module.h`.
• Detected declarations: `function cpufreq_supports_freq_invariance`, `function has_target`, `function has_target_index`, `function cpufreq_disabled`, `function disable_cpufreq`, `function have_governor_per_policy`, `function get_cpu_idle_time`, `function init`, `function cpufreq_generic_get`, `function cpufreq_cpu_get_raw`.
• Atlas domain: Driver Families / drivers/cpufreq.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.