drivers/char/tpm/xen-tpmfront.c

File Facts

System

Linux kernel

Corpus path

drivers/char/tpm/xen-tpmfront.c

Extension

.c

Size

9650 bytes

Lines

443

Domain

Driver Families

Bucket

drivers/char

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.
• 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/errno.h
• linux/err.h
• linux/interrupt.h
• linux/freezer.h
• xen/xen.h
• xen/events.h
• xen/interface/io/tpmif.h
• xen/grant_table.h
• xen/xenbus.h
• xen/page.h
• tpm.h
• xen/platform_pci.h

Detected Declarations

• struct tpm_private
• enum status_bits
• function wait_for_tpm_stat_cond
• function wait_for_tpm_stat
• function vtpm_status
• function vtpm_req_canceled
• function vtpm_cancel
• function shr_data_offset
• function vtpm_send
• function vtpm_recv
• function tpmif_interrupt
• function setup_chip
• function setup_ring
• function ring_free
• function tpmfront_probe
• function tpmfront_remove
• function tpmfront_resume
• function backend_changed
• function xen_tpmfront_init
• function xen_tpmfront_exit
• module init xen_tpmfront_init

Annotated Snippet

module_init(xen_tpmfront_init);

static void __exit xen_tpmfront_exit(void)
{
	xenbus_unregister_driver(&tpmfront_driver);
}
module_exit(xen_tpmfront_exit);

MODULE_AUTHOR("Daniel De Graaf <dgdegra@tycho.nsa.gov>");
MODULE_DESCRIPTION("Xen vTPM Driver");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/errno.h`, `linux/err.h`, `linux/interrupt.h`, `linux/freezer.h`, `xen/xen.h`, `xen/events.h`, `xen/interface/io/tpmif.h`, `xen/grant_table.h`.
• Detected declarations: `struct tpm_private`, `enum status_bits`, `function wait_for_tpm_stat_cond`, `function wait_for_tpm_stat`, `function vtpm_status`, `function vtpm_req_canceled`, `function vtpm_cancel`, `function shr_data_offset`, `function vtpm_send`, `function vtpm_recv`.
• Atlas domain: Driver Families / drivers/char.
• Implementation status: integration implementation candidate.
• 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.