drivers/gpu/drm/xen/xen_drm_front.c

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/xen/xen_drm_front.c

Extension

.c

Size

20200 bytes

Lines

791

Domain

Driver Families

Bucket

drivers/gpu

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/delay.h
• linux/dma-mapping.h
• linux/module.h
• drm/drm_atomic_helper.h
• drm/drm_drv.h
• drm/drm_ioctl.h
• drm/drm_probe_helper.h
• drm/drm_file.h
• drm/drm_gem.h
• drm/drm_print.h
• xen/platform_pci.h
• xen/xen.h
• xen/xenbus.h
• xen/xen-front-pgdir-shbuf.h
• xen/interface/io/displif.h
• xen_drm_front.h
• xen_drm_front_cfg.h
• xen_drm_front_evtchnl.h
• xen_drm_front_gem.h
• xen_drm_front_kms.h

Detected Declarations

• struct xen_drm_front_dbuf
• function dbuf_add_to_list
• function dbuf_free
• function list_for_each_entry_safe
• function dbuf_free_all
• function list_for_each_entry_safe
• function be_prepare_req
• function be_stream_do_io
• function be_stream_wait_io
• function xen_drm_front_mode_set
• function xen_drm_front_dbuf_create
• function xen_drm_front_dbuf_destroy
• function xen_drm_front_fb_attach
• function xen_drm_front_fb_detach
• function xen_drm_front_page_flip
• function xen_drm_front_on_frame_done
• function xen_drm_front_gem_object_free
• function xen_drm_drv_dumb_create
• function xen_drm_drv_release
• function xen_drm_drv_init
• function xen_drm_drv_fini
• function displback_initwait
• function displback_connect
• function displback_disconnect
• function displback_changed
• function xen_drv_probe
• function xen_drv_remove
• function xen_drv_init
• function xen_drv_fini
• module init xen_drv_init

Annotated Snippet

module_init(xen_drv_init);
module_exit(xen_drv_fini);

MODULE_DESCRIPTION("Xen para-virtualized display device frontend");
MODULE_LICENSE("GPL");
MODULE_ALIAS("xen:" XENDISPL_DRIVER_NAME);

Annotation

• Immediate include surface: `linux/delay.h`, `linux/dma-mapping.h`, `linux/module.h`, `drm/drm_atomic_helper.h`, `drm/drm_drv.h`, `drm/drm_ioctl.h`, `drm/drm_probe_helper.h`, `drm/drm_file.h`.
• Detected declarations: `struct xen_drm_front_dbuf`, `function dbuf_add_to_list`, `function dbuf_free`, `function list_for_each_entry_safe`, `function dbuf_free_all`, `function list_for_each_entry_safe`, `function be_prepare_req`, `function be_stream_do_io`, `function be_stream_wait_io`, `function xen_drm_front_mode_set`.
• Atlas domain: Driver Families / drivers/gpu.
• 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.