drivers/perf/arm-cmn.c

File Facts

System

Linux kernel

Corpus path

drivers/perf/arm-cmn.c

Extension

.c

Size

83609 bytes

Lines

2713

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/bitops.h
• linux/debugfs.h
• linux/interrupt.h
• linux/io.h
• linux/io-64-nonatomic-lo-hi.h
• linux/kernel.h
• linux/list.h
• linux/module.h
• linux/of.h
• linux/perf_event.h
• linux/platform_device.h
• linux/slab.h
• linux/sort.h

Detected Declarations

• struct arm_cmn_node
• struct arm_cmn_dtm
• struct arm_cmn_dtc
• struct arm_cmn
• struct arm_cmn_nodeid
• struct arm_cmn_hw_event
• struct arm_cmn_event_attr
• struct arm_cmn_format_attr
• struct arm_cmn_val
• enum cmn_model
• enum cmn_part
• enum cmn_revision
• enum cmn_node_type
• enum cmn_filter_select
• function arm_cmn_xyidbits
• function arm_cmn_nid
• function arm_cmn_model
• function arm_cmn_pmu_offset
• function arm_cmn_device_connect_info
• function arm_cmn_show_logid
• function arm_cmn_map_show
• function arm_cmn_debugfs_init
• function arm_cmn_debugfs_init
• function arm_cmn_set_index
• function arm_cmn_get_index
• function arm_cmn_set_wp_idx
• function arm_cmn_get_wp_idx
• function arm_cmn_event_show
• function arm_cmn_event_attr_is_visible
• function arm_cmn_format_show
• function arm_cmn_cpumask_show
• function arm_cmn_identifier_show
• function arm_cmn_find_free_wp_idx
• function arm_cmn_get_assigned_wp_idx
• function arm_cmn_claim_wp_idx
• function arm_cmn_wp_config
• function arm_cmn_set_state
• function arm_cmn_clear_state
• function arm_cmn_pmu_enable
• function arm_cmn_pmu_disable
• function arm_cmn_read_dtm
• function arm_cmn_read_cc
• function arm_cmn_read_counter
• function arm_cmn_init_counter
• function for_each_hw_dtc_idx
• function arm_cmn_event_read
• function arm_cmn_set_event_sel_hi
• function arm_cmn_set_event_sel_lo

Annotated Snippet

module_init(arm_cmn_init);
module_exit(arm_cmn_exit);

MODULE_AUTHOR("Robin Murphy <robin.murphy@arm.com>");
MODULE_DESCRIPTION("Arm CMN/CI interconnect PMU driver");
MODULE_LICENSE("GPL v2");

Annotation

• Immediate include surface: `linux/acpi.h`, `linux/bitfield.h`, `linux/bitops.h`, `linux/debugfs.h`, `linux/interrupt.h`, `linux/io.h`, `linux/io-64-nonatomic-lo-hi.h`, `linux/kernel.h`.
• Detected declarations: `struct arm_cmn_node`, `struct arm_cmn_dtm`, `struct arm_cmn_dtc`, `struct arm_cmn`, `struct arm_cmn_nodeid`, `struct arm_cmn_hw_event`, `struct arm_cmn_event_attr`, `struct arm_cmn_format_attr`, `struct arm_cmn_val`, `enum cmn_model`.
• 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.