drivers/acpi/apei/erst-dbg.c

File Facts

System

Linux kernel

Corpus path

drivers/acpi/apei/erst-dbg.c

Extension

.c

Size

4854 bytes

Lines

229

Domain

Driver Families

Bucket

drivers/acpi

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/kernel.h
• linux/module.h
• linux/uaccess.h
• acpi/apei.h
• linux/miscdevice.h
• apei-internal.h

Detected Declarations

• function erst_dbg_open
• function erst_dbg_release
• function erst_dbg_ioctl
• function erst_dbg_read
• function erst_dbg_write
• function erst_dbg_init
• function erst_dbg_exit
• module init erst_dbg_init

Annotated Snippet

static const struct file_operations erst_dbg_ops = {
	.owner		= THIS_MODULE,
	.open		= erst_dbg_open,
	.release	= erst_dbg_release,
	.read		= erst_dbg_read,
	.write		= erst_dbg_write,
	.unlocked_ioctl	= erst_dbg_ioctl,
};

static struct miscdevice erst_dbg_dev = {
	.minor	= MISC_DYNAMIC_MINOR,
	.name	= "erst_dbg",
	.fops	= &erst_dbg_ops,
};

static __init int erst_dbg_init(void)
{
	if (erst_disable) {
		pr_info(ERST_DBG_PFX "ERST support is disabled.\n");
		return -ENODEV;
	}
	return misc_register(&erst_dbg_dev);
}

static __exit void erst_dbg_exit(void)
{
	misc_deregister(&erst_dbg_dev);
	kfree(erst_dbg_buf);
}

module_init(erst_dbg_init);
module_exit(erst_dbg_exit);

MODULE_AUTHOR("Huang Ying");
MODULE_DESCRIPTION("APEI Error Record Serialization Table debug support");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/module.h`, `linux/uaccess.h`, `acpi/apei.h`, `linux/miscdevice.h`, `apei-internal.h`.
• Detected declarations: `function erst_dbg_open`, `function erst_dbg_release`, `function erst_dbg_ioctl`, `function erst_dbg_read`, `function erst_dbg_write`, `function erst_dbg_init`, `function erst_dbg_exit`, `module init erst_dbg_init`.
• Atlas domain: Driver Families / drivers/acpi.
• 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.