drivers/bus/fsl-mc/fsl-mc-uapi.c

File Facts

System

Linux kernel

Corpus path

drivers/bus/fsl-mc/fsl-mc-uapi.c

Extension

.c

Size

12869 bytes

Lines

605

Domain

Driver Families

Bucket

drivers/bus

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/slab.h
• linux/fs.h
• linux/uaccess.h
• linux/miscdevice.h
• fsl-mc-private.h

Detected Declarations

• struct uapi_priv_data
• struct fsl_mc_cmd_desc
• enum fsl_mc_cmd_index
• function fsl_mc_command_check
• function fsl_mc_uapi_send_command
• function fsl_mc_uapi_dev_open
• function fsl_mc_uapi_dev_release
• function fsl_mc_uapi_dev_ioctl
• function fsl_mc_uapi_create_device_file
• function fsl_mc_uapi_remove_device_file

Annotated Snippet

static const struct file_operations fsl_mc_uapi_dev_fops = {
	.owner = THIS_MODULE,
	.open = fsl_mc_uapi_dev_open,
	.release = fsl_mc_uapi_dev_release,
	.unlocked_ioctl = fsl_mc_uapi_dev_ioctl,
};

int fsl_mc_uapi_create_device_file(struct fsl_mc_bus *mc_bus)
{
	struct fsl_mc_device *mc_dev = &mc_bus->mc_dev;
	struct fsl_mc_uapi *mc_uapi = &mc_bus->uapi_misc;
	int error;

	mc_uapi->misc.minor = MISC_DYNAMIC_MINOR;
	mc_uapi->misc.name = dev_name(&mc_dev->dev);
	mc_uapi->misc.fops = &fsl_mc_uapi_dev_fops;

	error = misc_register(&mc_uapi->misc);
	if (error)
		return error;

	mc_uapi->static_mc_io = mc_bus->mc_dev.mc_io;

	mutex_init(&mc_uapi->mutex);

	return 0;
}

void fsl_mc_uapi_remove_device_file(struct fsl_mc_bus *mc_bus)
{
	misc_deregister(&mc_bus->uapi_misc.misc);
}

Annotation

• Immediate include surface: `linux/slab.h`, `linux/fs.h`, `linux/uaccess.h`, `linux/miscdevice.h`, `fsl-mc-private.h`.
• Detected declarations: `struct uapi_priv_data`, `struct fsl_mc_cmd_desc`, `enum fsl_mc_cmd_index`, `function fsl_mc_command_check`, `function fsl_mc_uapi_send_command`, `function fsl_mc_uapi_dev_open`, `function fsl_mc_uapi_dev_release`, `function fsl_mc_uapi_dev_ioctl`, `function fsl_mc_uapi_create_device_file`, `function fsl_mc_uapi_remove_device_file`.
• Atlas domain: Driver Families / drivers/bus.
• 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.