drivers/video/fbdev/xen-fbfront.c

File Facts

System

Linux kernel

Corpus path

drivers/video/fbdev/xen-fbfront.c

Extension

.c

Size

17694 bytes

Lines

700

Domain

Driver Families

Bucket

drivers/video

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/console.h
• linux/kernel.h
• linux/errno.h
• linux/fb.h
• linux/module.h
• linux/slab.h
• linux/vmalloc.h
• linux/mm.h
• asm/xen/hypervisor.h
• xen/xen.h
• xen/events.h
• xen/page.h
• xen/interface/io/fbif.h
• xen/interface/io/protocols.h
• xen/xenbus.h
• xen/platform_pci.h

Detected Declarations

• struct xenfb_info
• function xenfb_send_event
• function xenfb_do_update
• function xenfb_do_resize
• function xenfb_queue_full
• function xenfb_handle_resize_dpy
• function xenfb_refresh
• function xenfb_deferred_io
• function xenfb_setcolreg
• function xenfb_check_var
• function xenfb_set_par
• function xenfb_defio_damage_range
• function xenfb_defio_damage_area
• function xenfb_event_handler
• function xenfb_probe
• function xenfb_make_preferred_console
• function xenfb_resume
• function xenfb_remove
• function vmalloc_to_gfn
• function xenfb_init_shared_page
• function xenfb_connect_backend
• function xenfb_disconnect_backend
• function xenfb_backend_changed
• function xenfb_init
• function xenfb_cleanup
• module init xenfb_init

Annotated Snippet

module_init(xenfb_init);
module_exit(xenfb_cleanup);

MODULE_DESCRIPTION("Xen virtual framebuffer device frontend");
MODULE_LICENSE("GPL");
MODULE_ALIAS("xen:vfb");

Annotation

• Immediate include surface: `linux/console.h`, `linux/kernel.h`, `linux/errno.h`, `linux/fb.h`, `linux/module.h`, `linux/slab.h`, `linux/vmalloc.h`, `linux/mm.h`.
• Detected declarations: `struct xenfb_info`, `function xenfb_send_event`, `function xenfb_do_update`, `function xenfb_do_resize`, `function xenfb_queue_full`, `function xenfb_handle_resize_dpy`, `function xenfb_refresh`, `function xenfb_deferred_io`, `function xenfb_setcolreg`, `function xenfb_check_var`.
• Atlas domain: Driver Families / drivers/video.
• 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.