drivers/perf/arm-ni.c

File Facts

System

Linux kernel

Corpus path

drivers/perf/arm-ni.c

Extension

.c

Size

21812 bytes

Lines

863

Domain

Driver Families

Bucket

drivers/perf

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.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• 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/acpi.h
• linux/bitfield.h
• linux/interrupt.h
• linux/io.h
• linux/io-64-nonatomic-lo-hi.h
• linux/kernel.h
• linux/module.h
• linux/of.h
• linux/perf_event.h
• linux/platform_device.h
• linux/slab.h

Detected Declarations

• struct arm_ni_node
• struct arm_ni_unit
• struct arm_ni_cd
• struct arm_ni
• struct arm_ni_event_attr
• struct arm_ni_format_attr
• struct arm_ni_val
• enum ni_part
• enum ni_node_type
• function arm_ni_event_show
• function arm_ni_event_attr_is_visible
• function cd_for_each_unit
• function arm_ni_format_show
• function arm_ni_cpumask_show
• function arm_ni_identifier_show
• function arm_ni_pmu_enable
• function arm_ni_pmu_disable
• function arm_ni_val_count_event
• function arm_ni_validate_group
• function for_each_sibling_event
• function arm_ni_is_7xx
• function arm_ni_event_init
• function cd_for_each_unit
• function arm_ni_read_ccnt
• function arm_ni_event_read
• function arm_ni_event_start
• function arm_ni_event_stop
• function arm_ni_init_ccnt
• function arm_ni_init_evcnt
• function arm_ni_event_add
• function arm_ni_event_del
• function arm_ni_handle_irq
• function arm_ni_init_cd
• function arm_ni_remove
• function ni_for_each_cd
• function arm_ni_probe_domain
• function arm_ni_init_irqs
• function ni_for_each_cd
• function arm_ni_probe
• function arm_ni_pmu_migrate
• function arm_ni_pmu_online_cpu
• function arm_ni_pmu_offline_cpu
• function arm_ni_init
• function arm_ni_exit
• module init arm_ni_init

Annotated Snippet

module_init(arm_ni_init);
module_exit(arm_ni_exit);

MODULE_AUTHOR("Robin Murphy <robin.murphy@arm.com>");
MODULE_DESCRIPTION("Arm NI-700 PMU driver");
MODULE_LICENSE("GPL v2");

Annotation

• Immediate include surface: `linux/acpi.h`, `linux/bitfield.h`, `linux/interrupt.h`, `linux/io.h`, `linux/io-64-nonatomic-lo-hi.h`, `linux/kernel.h`, `linux/module.h`, `linux/of.h`.
• Detected declarations: `struct arm_ni_node`, `struct arm_ni_unit`, `struct arm_ni_cd`, `struct arm_ni`, `struct arm_ni_event_attr`, `struct arm_ni_format_attr`, `struct arm_ni_val`, `enum ni_part`, `enum ni_node_type`, `function arm_ni_event_show`.
• Atlas domain: Driver Families / drivers/perf.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.