sound/soc/sof/ipc4-telemetry.c

File Facts

System

Linux kernel

Corpus path

sound/soc/sof/ipc4-telemetry.c

Extension

.c

Size

2428 bytes

Lines

96

Domain

Driver Families

Bucket

sound/soc

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.
• 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/debugfs.h
• linux/io.h
• linux/pm_runtime.h
• sound/sof/debug.h
• sound/sof/ipc4/header.h
• sof-priv.h
• ops.h
• ipc4-telemetry.h
• ipc4-priv.h

Detected Declarations

• function sof_telemetry_entry_read
• function sof_ipc4_create_exception_debugfs_node

Annotated Snippet

static const struct file_operations sof_telemetry_fops = {
	.open = simple_open,
	.read = sof_telemetry_entry_read,
};

void sof_ipc4_create_exception_debugfs_node(struct snd_sof_dev *sdev)
{
	struct snd_sof_dfsentry *dfse;

	dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
	if (!dfse)
		return;

	dfse->type = SOF_DFSENTRY_TYPE_IOMEM;
	dfse->size = SOF_IPC4_DEBUG_SLOT_SIZE - 4;
	dfse->access_type = SOF_DEBUGFS_ACCESS_ALWAYS;
	dfse->sdev = sdev;

	list_add(&dfse->list, &sdev->dfsentry_list);

	debugfs_create_file("exception", 0444, sdev->debugfs_root, dfse, &sof_telemetry_fops);
}

Annotation

• Immediate include surface: `linux/debugfs.h`, `linux/io.h`, `linux/pm_runtime.h`, `sound/sof/debug.h`, `sound/sof/ipc4/header.h`, `sof-priv.h`, `ops.h`, `ipc4-telemetry.h`.
• Detected declarations: `function sof_telemetry_entry_read`, `function sof_ipc4_create_exception_debugfs_node`.
• Atlas domain: Driver Families / sound/soc.
• Implementation status: pattern implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.

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.