drivers/perf/cxl_pmu.c

File Facts

System

Linux kernel

Corpus path

drivers/perf/cxl_pmu.c

Extension

.c

Size

32036 bytes

Lines

984

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.
• 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/io-64-nonatomic-lo-hi.h
• linux/perf_event.h
• linux/bitops.h
• linux/device.h
• linux/bits.h
• linux/list.h
• linux/bug.h
• linux/pci.h
• ../cxl/cxlpci.h
• ../cxl/cxl.h
• ../cxl/pmu.h

Detected Declarations

• struct cxl_pmu_ev_cap
• struct cxl_pmu_info
• function combination
• function for_each_clear_bit
• function cxl_pmu_format_is_visible
• function cxl_pmu_config_get_mask
• function cxl_pmu_config_get_gid
• function cxl_pmu_config_get_vid
• function cxl_pmu_config1_get_threshold
• function cxl_pmu_config1_get_invert
• function cxl_pmu_config1_get_edge
• function cxl_pmu_config1_hdm_filter_en
• function cxl_pmu_config2_get_hdm_decoder
• function cxl_pmu_event_sysfs_show
• function list_for_each_entry
• function list_for_each_entry
• function cxl_pmu_event_is_visible
• function cpumask_show
• function cxl_pmu_get_event_idx
• function cxl_pmu_event_init
• function cxl_pmu_enable
• function cxl_pmu_disable
• function cxl_pmu_event_start
• function cxl_pmu_read_counter
• function __cxl_pmu_read
• function cxl_pmu_read
• function cxl_pmu_event_stop
• function cxl_pmu_event_add
• function cxl_pmu_event_del
• function cxl_pmu_irq
• function cxl_pmu_perf_unregister
• function cxl_pmu_cpuhp_remove
• function cxl_pmu_probe
• function cxl_pmu_online_cpu
• function cxl_pmu_offline_cpu
• function cxl_pmu_init
• function cxl_pmu_exit
• module init cxl_pmu_init

Annotated Snippet

module_init(cxl_pmu_init);
module_exit(cxl_pmu_exit);
MODULE_ALIAS_CXL(CXL_DEVICE_PMU);

Annotation

• Immediate include surface: `linux/io-64-nonatomic-lo-hi.h`, `linux/perf_event.h`, `linux/bitops.h`, `linux/device.h`, `linux/bits.h`, `linux/list.h`, `linux/bug.h`, `linux/pci.h`.
• Detected declarations: `struct cxl_pmu_ev_cap`, `struct cxl_pmu_info`, `function combination`, `function for_each_clear_bit`, `function cxl_pmu_format_is_visible`, `function cxl_pmu_config_get_mask`, `function cxl_pmu_config_get_gid`, `function cxl_pmu_config_get_vid`, `function cxl_pmu_config1_get_threshold`, `function cxl_pmu_config1_get_invert`.
• Atlas domain: Driver Families / drivers/perf.
• Implementation status: integration implementation candidate.
• 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.