sound/core/pcm.c

File Facts

System

Linux kernel

Corpus path

sound/core/pcm.c

Extension

.c

Size

33606 bytes

Lines

1233

Domain

Driver Families

Bucket

sound/core

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 user memory; correctness depends on fault-safe copying and privilege boundary handling.
• 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/init.h
• linux/slab.h
• linux/module.h
• linux/time.h
• linux/mutex.h
• linux/device.h
• linux/nospec.h
• sound/core.h
• sound/minors.h
• sound/pcm.h
• sound/timer.h
• sound/control.h
• sound/info.h
• pcm_local.h
• linux/soundcard.h

Detected Declarations

• function list_for_each_entry
• function snd_pcm_next
• function list_for_each_entry
• function snd_pcm_add
• function list_for_each_entry
• function snd_pcm_control_ioctl
• function snd_pcm_proc_info_read
• function snd_pcm_stream_proc_info_read
• function snd_pcm_substream_proc_info_read
• function snd_pcm_substream_proc_hw_params_read
• function snd_pcm_substream_proc_sw_params_read
• function snd_pcm_substream_proc_status_read
• function snd_pcm_xrun_injection_write
• function snd_pcm_xrun_debug_read
• function snd_pcm_xrun_debug_write
• function snd_pcm_stream_proc_init
• function snd_pcm_stream_proc_done
• function create_substream_info_entry
• function snd_pcm_substream_proc_init
• function snd_pcm_stream_proc_init
• function snd_pcm_stream_proc_done
• function snd_pcm_substream_proc_init
• function do_pcm_suspend
• function snd_pcm_new
• function _snd_pcm_new
• function snd_pcm_set_ops
• function snd_pcm_set_ops
• function free_chmap
• function snd_pcm_free_stream
• function snd_pcm_free
• function snd_pcm_dev_free
• function snd_pcm_attach_substream
• function snd_pcm_detach_substream
• function pcm_class_show
• function snd_pcm_dev_register
• function snd_pcm_dev_disconnect
• function for_each_pcm_substream
• function snd_pcm_notify
• function snd_pcm_proc_read
• function snd_pcm_proc_init
• function snd_pcm_proc_done
• function alsa_pcm_init
• function alsa_pcm_exit
• module init alsa_pcm_init
• export snd_pcm_format_name
• export snd_pcm_new_stream
• export snd_pcm_new
• export snd_pcm_new_internal

Annotated Snippet

module_init(alsa_pcm_init)
module_exit(alsa_pcm_exit)

Annotation

• Immediate include surface: `linux/init.h`, `linux/slab.h`, `linux/module.h`, `linux/time.h`, `linux/mutex.h`, `linux/device.h`, `linux/nospec.h`, `sound/core.h`.
• Detected declarations: `function list_for_each_entry`, `function snd_pcm_next`, `function list_for_each_entry`, `function snd_pcm_add`, `function list_for_each_entry`, `function snd_pcm_control_ioctl`, `function snd_pcm_proc_info_read`, `function snd_pcm_stream_proc_info_read`, `function snd_pcm_substream_proc_info_read`, `function snd_pcm_substream_proc_hw_params_read`.
• Atlas domain: Driver Families / sound/core.
• Implementation status: integration implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
• 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.