sound/core/pcm_native.c

File Facts

System

Linux kernel

Corpus path

sound/core/pcm_native.c

Extension

.c

Size

120505 bytes

Lines

4261

Domain

Driver Families

Bucket

sound/core

Inferred role

Driver Families: operation-table or driver-model contract

Status

pattern 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.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• 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/compat.h
• linux/mm.h
• linux/module.h
• linux/file.h
• linux/slab.h
• linux/sched/signal.h
• linux/time.h
• linux/pm_qos.h
• linux/io.h
• linux/dma-mapping.h
• linux/vmalloc.h
• sound/core.h
• sound/control.h
• sound/info.h
• sound/pcm.h
• sound/pcm_params.h
• sound/timer.h
• sound/minors.h
• linux/uio.h
• linux/delay.h
• linux/bitops.h
• pcm_local.h
• pcm_param_trace.h
• pcm_compat.c

Detected Declarations

• struct snd_pcm_hw_params_old
• struct action_ops
• struct snd_pcm_mmap_status32
• struct snd_pcm_mmap_control32
• struct snd_pcm_sync_ptr32
• function snd_pcm_group_init
• function snd_pcm_stream_lock
• function snd_pcm_stream_lock
• function snd_pcm_stream_lock
• function snd_pcm_stream_lock_nested
• function snd_pcm_stream_unlock_irq
• function _snd_pcm_stream_lock_irqsave
• function _snd_pcm_stream_lock_irqsave_nested
• function snd_pcm_stream_unlock_irqrestore
• function snd_pcm_ops_ioctl
• function snd_pcm_info
• function snd_pcm_info_user
• function hw_support_mmap
• function constrain_mask_params
• function constrain_interval_params
• function constrain_params_by_rules
• function fixup_unreferenced_params
• function snd_pcm_hw_refine
• function snd_pcm_hw_refine_user
• function period_to_usecs
• function snd_pcm_set_state
• function snd_pcm_get_state
• function snd_pcm_state_open_or_disconnected
• function snd_pcm_timer_notify
• function snd_pcm_sync_stop
• function snd_pcm_hw_params_choose
• function snd_pcm_buffer_access_lock
• function snd_pcm_buffer_access_unlock
• function snd_pcm_runtime_buffer_set_silence
• function snd_pcm_hw_params
• function snd_pcm_hw_params_user
• function do_hw_free
• function snd_pcm_hw_free
• function snd_pcm_sw_params
• function snd_pcm_sw_params_user
• function snd_pcm_calc_delay
• function snd_pcm_status64
• function snd_pcm_status_user64
• function snd_pcm_status_user32
• function snd_pcm_channel_info
• function snd_pcm_channel_info_user
• function snd_pcm_trigger_tstamp
• function snd_pcm_action_group

Annotated Snippet

const struct file_operations snd_pcm_f_ops[2] = {
	{
		.owner =		THIS_MODULE,
		.write =		snd_pcm_write,
		.write_iter =		snd_pcm_writev,
		.open =			snd_pcm_playback_open,
		.release =		snd_pcm_release,
		.poll =			snd_pcm_poll,
		.unlocked_ioctl =	snd_pcm_ioctl,
		.compat_ioctl = 	snd_pcm_ioctl_compat,
		.mmap =			snd_pcm_mmap,
		.fasync =		snd_pcm_fasync,
		.get_unmapped_area =	snd_pcm_get_unmapped_area,
	},
	{
		.owner =		THIS_MODULE,
		.read =			snd_pcm_read,
		.read_iter =		snd_pcm_readv,
		.open =			snd_pcm_capture_open,
		.release =		snd_pcm_release,
		.poll =			snd_pcm_poll,
		.unlocked_ioctl =	snd_pcm_ioctl,
		.compat_ioctl = 	snd_pcm_ioctl_compat,
		.mmap =			snd_pcm_mmap,
		.fasync =		snd_pcm_fasync,
		.get_unmapped_area =	snd_pcm_get_unmapped_area,
	}
};

Annotation

• Immediate include surface: `linux/compat.h`, `linux/mm.h`, `linux/module.h`, `linux/file.h`, `linux/slab.h`, `linux/sched/signal.h`, `linux/time.h`, `linux/pm_qos.h`.
• Detected declarations: `struct snd_pcm_hw_params_old`, `struct action_ops`, `struct snd_pcm_mmap_status32`, `struct snd_pcm_mmap_control32`, `struct snd_pcm_sync_ptr32`, `function snd_pcm_group_init`, `function snd_pcm_stream_lock`, `function snd_pcm_stream_lock`, `function snd_pcm_stream_lock`, `function snd_pcm_stream_lock_nested`.
• Atlas domain: Driver Families / sound/core.
• Implementation status: pattern 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.