drivers/usb/early/xhci-dbc.c

File Facts

System

Linux kernel

Corpus path

drivers/usb/early/xhci-dbc.c

Extension

.c

Size

24876 bytes

Lines

1012

Domain

Driver Families

Bucket

drivers/usb

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

Dependency Surface

• linux/console.h
• linux/pci_regs.h
• linux/pci_ids.h
• linux/memblock.h
• linux/io.h
• asm/pci-direct.h
• asm/fixmap.h
• linux/bcd.h
• linux/export.h
• linux/module.h
• linux/delay.h
• linux/kthread.h
• linux/usb/xhci-dbgp.h
• ../host/xhci.h
• xhci-dbc.h

Detected Declarations

• function xdbc_trace
• function xdbc_get_page
• function xdbc_find_dbgp
• function handshake
• function xdbc_bios_handoff
• function xdbc_alloc_ring
• function xdbc_free_ring
• function xdbc_reset_ring
• function xdbc_put_utf16
• function xdbc_mem_init
• function xdbc_do_reset_debug_port
• function xdbc_reset_debug_port
• function xdbc_queue_trb
• function xdbc_ring_doorbell
• function xdbc_start
• function xdbc_bulk_transfer
• function xdbc_handle_external_reset
• function xdbc_early_setup
• function early_xdbc_parse_parameter
• function early_xdbc_setup_hardware
• function xdbc_handle_port_status
• function xdbc_handle_tx_event
• function xdbc_handle_events
• function xdbc_bulk_write
• function early_xdbc_write
• function early_xdbc_register_console
• function xdbc_unregister_console
• function xdbc_scrub_function
• function xdbc_init
• module init xdbc_init

Annotated Snippet

subsys_initcall(xdbc_init);

Annotation

• Immediate include surface: `linux/console.h`, `linux/pci_regs.h`, `linux/pci_ids.h`, `linux/memblock.h`, `linux/io.h`, `asm/pci-direct.h`, `asm/fixmap.h`, `linux/bcd.h`.
• Detected declarations: `function xdbc_trace`, `function xdbc_get_page`, `function xdbc_find_dbgp`, `function handshake`, `function xdbc_bios_handoff`, `function xdbc_alloc_ring`, `function xdbc_free_ring`, `function xdbc_reset_ring`, `function xdbc_put_utf16`, `function xdbc_mem_init`.
• Atlas domain: Driver Families / drivers/usb.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

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.