drivers/usb/gadget/function/f_tcm.c

File Facts

System

Linux kernel

Corpus path

drivers/usb/gadget/function/f_tcm.c

Extension

.c

Size

65789 bytes

Lines

2658

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.
• 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/kernel.h
• linux/module.h
• linux/types.h
• linux/string.h
• linux/configfs.h
• linux/ctype.h
• linux/delay.h
• linux/usb/ch9.h
• linux/usb/composite.h
• linux/usb/gadget.h
• linux/usb/storage.h
• scsi/scsi_tcq.h
• target/target_core_base.h
• target/target_core_fabric.h
• linux/unaligned.h
• tcm.h
• u_tcm.h
• configfs.h

Detected Declarations

• struct tpg_instance
• struct guas_setup_wq
• function bot_enqueue_cmd_cbw
• function bot_status_complete
• function bot_enqueue_sense_code
• function bot_err_compl
• function bot_send_bad_status
• function bot_send_status
• function command
• function bot_read_compl
• function bot_send_read_response
• function bot_send_write_request
• function bot_cmd_complete
• function bot_prepare_reqs
• function bot_cleanup_old_alt
• function bot_set_alt
• function usbg_bot_setup
• function tcm_to_uasp_response
• function uasp_to_tcm_func
• function uasp_cleanup_one_stream
• function uasp_free_cmdreq
• function uasp_cleanup_old_alt
• function uasp_prepare_r_request
• function uasp_prepare_status
• function uasp_prepare_response
• function uasp_status_data_cmpl
• function uasp_send_status_response
• function uasp_send_tm_response
• function uasp_send_read_response
• function uasp_send_write_request
• function uasp_cmd_complete
• function uasp_alloc_stream_res
• function uasp_alloc_cmd
• function uasp_prepare_reqs
• function uasp_set_alt
• function get_cmd_dir
• function usbg_data_write_cmpl
• function usbg_prepare_w_request
• function usbg_send_status_response
• function usbg_send_write_request
• function usbg_send_read_response
• function usbg_submit_tmr
• function usbg_submit_cmd
• function usbg_cmd_work
• function hash_for_each_possible_safe
• function usbg_submit_command
• function hash_for_each_possible_safe
• function bot_cmd_work

Annotated Snippet

module_init(tcm_init);

static void __exit tcm_exit(void)
{
	target_unregister_template(&usbg_ops);
	usb_function_unregister(&tcmusb_func);
}
module_exit(tcm_exit);

MODULE_DESCRIPTION("Target based USB-Gadget");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sebastian Andrzej Siewior");

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/module.h`, `linux/types.h`, `linux/string.h`, `linux/configfs.h`, `linux/ctype.h`, `linux/delay.h`, `linux/usb/ch9.h`.
• Detected declarations: `struct tpg_instance`, `struct guas_setup_wq`, `function bot_enqueue_cmd_cbw`, `function bot_status_complete`, `function bot_enqueue_sense_code`, `function bot_err_compl`, `function bot_send_bad_status`, `function bot_send_status`, `function command`, `function bot_read_compl`.
• 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.