drivers/cxl/port.c

File Facts

System

Linux kernel

Corpus path

drivers/cxl/port.c

Extension

.c

Size

8886 bytes

Lines

345

Domain

Driver Families

Bucket

drivers/cxl

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/aer.h
• linux/device.h
• linux/module.h
• linux/slab.h
• cxlmem.h
• cxlpci.h

Detected Declarations

• function schedule_detach
• function discover_region
• function cxl_switch_port_probe
• function cxl_ras_unmask
• function cxl_endpoint_port_probe
• function cxl_port_probe
• function CDAT_read
• function cxl_port_bin_attr_is_visible
• function devm_cxl_add_endpoint
• function cxl_port_init
• function cxl_port_exit
• module init cxl_port_init

Annotated Snippet

subsys_initcall(cxl_port_init);

static void __exit cxl_port_exit(void)
{
	cxl_driver_unregister(&cxl_port_driver);
}
module_exit(cxl_port_exit);

MODULE_DESCRIPTION("CXL: Port enumeration and services");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS("CXL");
MODULE_ALIAS_CXL(CXL_DEVICE_PORT);

Annotation

• Immediate include surface: `linux/aer.h`, `linux/device.h`, `linux/module.h`, `linux/slab.h`, `cxlmem.h`, `cxlpci.h`.
• Detected declarations: `function schedule_detach`, `function discover_region`, `function cxl_switch_port_probe`, `function cxl_ras_unmask`, `function cxl_endpoint_port_probe`, `function cxl_port_probe`, `function CDAT_read`, `function cxl_port_bin_attr_is_visible`, `function devm_cxl_add_endpoint`, `function cxl_port_init`.
• Atlas domain: Driver Families / drivers/cxl.
• Implementation status: integration implementation candidate.

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.