drivers/pci/endpoint/pci-ep-cfs.c

File Facts

System

Linux kernel

Corpus path

drivers/pci/endpoint/pci-ep-cfs.c

Extension

.c

Size

19675 bytes

Lines

778

Domain

Representative Device Path

Bucket

PCIe NVMe Storage Path

Inferred role

Representative Device Path: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Part of the selected hardware vertical slice: PCI discovery, driver binding, NVMe queues, block requests, DMA, interrupts, and completion.

• Part of the selected hardware vertical slice: PCI discovery, driver binding, NVMe queues, block requests, DMA, interrupts, and completion.
• 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/module.h
• linux/idr.h
• linux/slab.h
• linux/pci-epc.h
• linux/pci-epf.h
• linux/pci-ep-cfs.h

Detected Declarations

• struct pci_epf_group
• struct pci_epc_group
• function pci_secondary_epc_epf_link
• function pci_secondary_epc_epf_unlink
• function pci_primary_epc_epf_link
• function pci_primary_epc_epf_unlink
• function pci_epc_start_store
• function pci_epc_start_show
• function pci_epc_epf_link
• function pci_epc_epf_unlink
• function pci_ep_cfs_remove_epc_group
• function pci_epf_msi_interrupts_store
• function pci_epf_msi_interrupts_show
• function pci_epf_msix_interrupts_store
• function pci_epf_msix_interrupts_show
• function pci_epf_vepf_link
• function pci_epf_vepf_unlink
• function pci_epf_release
• function pci_epf_type_add_cfs
• function pci_ep_cfs_add_type_group
• function pci_epf_cfs_add_sub_groups
• function pci_epf_drop
• function pci_ep_cfs_remove_epf_group
• function pci_ep_cfs_init
• function pci_ep_cfs_exit
• module init pci_ep_cfs_init
• export pci_ep_cfs_add_epc_group
• export pci_ep_cfs_remove_epc_group
• export pci_ep_cfs_add_epf_group
• export pci_ep_cfs_remove_epf_group

Annotated Snippet

module_init(pci_ep_cfs_init);

static void __exit pci_ep_cfs_exit(void)
{
	configfs_unregister_default_group(controllers_group);
	configfs_unregister_default_group(functions_group);
	configfs_unregister_subsystem(&pci_ep_cfs_subsys);
}
module_exit(pci_ep_cfs_exit);

MODULE_DESCRIPTION("PCI EP CONFIGFS");
MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");

Annotation

• Immediate include surface: `linux/module.h`, `linux/idr.h`, `linux/slab.h`, `linux/pci-epc.h`, `linux/pci-epf.h`, `linux/pci-ep-cfs.h`.
• Detected declarations: `struct pci_epf_group`, `struct pci_epc_group`, `function pci_secondary_epc_epf_link`, `function pci_secondary_epc_epf_unlink`, `function pci_primary_epc_epf_link`, `function pci_primary_epc_epf_unlink`, `function pci_epc_start_store`, `function pci_epc_start_show`, `function pci_epc_epf_link`, `function pci_epc_epf_unlink`.
• Atlas domain: Representative Device Path / PCIe NVMe Storage Path.
• 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.