sound/xen/xen_snd_front.c

File Facts

System

Linux kernel

Corpus path

sound/xen/xen_snd_front.c

Extension

.c

Size

9392 bytes

Lines

388

Domain

Driver Families

Bucket

sound/xen

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.
• 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/module.h
• xen/page.h
• xen/platform_pci.h
• xen/xen.h
• xen/xenbus.h
• xen/xen-front-pgdir-shbuf.h
• xen/interface/io/sndif.h
• xen_snd_front.h
• xen_snd_front_alsa.h
• xen_snd_front_evtchnl.h

Detected Declarations

• function Copyright
• function be_stream_do_io
• function be_stream_wait_io
• function xen_snd_front_stream_query_hw_param
• function scoped_guard
• function xen_snd_front_stream_prepare
• function scoped_guard
• function xen_snd_front_stream_close
• function scoped_guard
• function xen_snd_front_stream_write
• function scoped_guard
• function xen_snd_front_stream_read
• function scoped_guard
• function xen_snd_front_stream_trigger
• function scoped_guard
• function xen_snd_drv_fini
• function sndback_initwait
• function sndback_connect
• function sndback_disconnect
• function sndback_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 virtual sound device frontend");
MODULE_LICENSE("GPL");
MODULE_ALIAS("xen:" XENSND_DRIVER_NAME);

Annotation

• Immediate include surface: `linux/delay.h`, `linux/module.h`, `xen/page.h`, `xen/platform_pci.h`, `xen/xen.h`, `xen/xenbus.h`, `xen/xen-front-pgdir-shbuf.h`, `xen/interface/io/sndif.h`.
• Detected declarations: `function Copyright`, `function be_stream_do_io`, `function be_stream_wait_io`, `function xen_snd_front_stream_query_hw_param`, `function scoped_guard`, `function xen_snd_front_stream_prepare`, `function scoped_guard`, `function xen_snd_front_stream_close`, `function scoped_guard`, `function xen_snd_front_stream_write`.
• Atlas domain: Driver Families / sound/xen.
• Implementation status: integration 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.