drivers/thunderbolt/dma_port.h

File Facts

System

Linux kernel

Corpus path

drivers/thunderbolt/dma_port.h

Extension

.h

Size

937 bytes

Lines

32

Domain

Driver Families

Bucket

drivers/thunderbolt

Inferred role

Driver Families: implementation source

Status

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

Dependency Surface

• tb.h

Detected Declarations

• struct tb_switch
• struct tb_dma_port

Annotated Snippet

#ifndef DMA_PORT_H_
#define DMA_PORT_H_

#include "tb.h"

struct tb_switch;
struct tb_dma_port;

#define DMA_PORT_CSS_ADDRESS		0x3fffff
#define DMA_PORT_CSS_MAX_SIZE		SZ_128

struct tb_dma_port *dma_port_alloc(struct tb_switch *sw);
void dma_port_free(struct tb_dma_port *dma);
int dma_port_flash_read(struct tb_dma_port *dma, unsigned int address,
			void *buf, size_t size);
int dma_port_flash_update_auth(struct tb_dma_port *dma);
int dma_port_flash_update_auth_status(struct tb_dma_port *dma, u32 *status);
int dma_port_flash_write(struct tb_dma_port *dma, unsigned int address,
			 const void *buf, size_t size);
int dma_port_power_cycle(struct tb_dma_port *dma);

#endif

Annotation

• Immediate include surface: `tb.h`.
• Detected declarations: `struct tb_switch`, `struct tb_dma_port`.
• Atlas domain: Driver Families / drivers/thunderbolt.
• Implementation status: source 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.