drivers/usb/host/xhci.c

File Facts

System

Linux kernel

Corpus path

drivers/usb/host/xhci.c

Extension

.c

Size

171929 bytes

Lines

5721

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.
• 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/jiffies.h
• linux/pci.h
• linux/iommu.h
• linux/iopoll.h
• linux/irq.h
• linux/log2.h
• linux/module.h
• linux/moduleparam.h
• linux/slab.h
• linux/string_choices.h
• linux/dmi.h
• linux/dma-mapping.h
• linux/usb/xhci-sideband.h
• xhci.h
• xhci-trace.h
• xhci-debugfs.h
• xhci-dbgcap.h

Detected Declarations

• function xhci_portsc_writel
• function xhci_portsc_readl
• function td_on_ring
• function xhci_for_each_ring_seg
• function xhci_handshake
• function xhci_quiesce
• function xhci_halt
• function xhci_start
• function xhci_reset
• function xhci_zero_64b_regs
• function xhci_enable_interrupter
• function xhci_disable_interrupter
• function xhci_set_interrupter_moderation
• function compliance_mode_recovery
• function mode
• function xhci_compliance_mode_recovery_timer_quirk_check
• function xhci_all_ports_seen_u0
• function xhci_hcd_page_size
• function xhci_enable_max_dev_slots
• function xhci_set_cmd_ring_deq
• function xhci_set_doorbell_ptr
• function xhci_set_dev_notifications
• function xhci_init
• function xhci_run_finished
• function xhci_stop
• function xhci_run
• function HC
• function xhci_save_registers
• function xhci_restore_registers
• function ring
• function enumerated
• function xhci_pending_portevent
• function HC
• function BIT
• function xHC
• function xhci_map_temp_buffer
• function xhci_urb_temp_buffer_required
• function xhci_unmap_temp_buf
• function Transfer
• function xhci_unmap_urb_for_dma
• function xhci_get_endpoint_index
• function xhci_get_endpoint_address
• function xhci_get_endpoint_flag
• function fls
• function xhci_check_args
• function xhci_check_ep0_maxpacket
• function owner
• function usb_hcd_unlink_urb

Annotated Snippet

module_init(xhci_hcd_init);
module_exit(xhci_hcd_fini);

Annotation

• Immediate include surface: `linux/jiffies.h`, `linux/pci.h`, `linux/iommu.h`, `linux/iopoll.h`, `linux/irq.h`, `linux/log2.h`, `linux/module.h`, `linux/moduleparam.h`.
• Detected declarations: `function xhci_portsc_writel`, `function xhci_portsc_readl`, `function td_on_ring`, `function xhci_for_each_ring_seg`, `function xhci_handshake`, `function xhci_quiesce`, `function xhci_halt`, `function xhci_start`, `function xhci_reset`, `function xhci_zero_64b_regs`.
• 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.
• 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.